Advance Wayland and KDE package bring-up

Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent)

Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/CMakeLists.txt

@@ -0,0 +1,45 @@
+add_executable(proxymodeltestapp)
+
+target_sources(proxymodeltestapp PRIVATE
+    main.cpp
+    mainwindow.cpp
+
+    breadcrumbdirectionwidget.cpp
+    breadcrumbnavigationwidget.cpp
+    breadcrumbswidget.cpp
+    checkablewidget.cpp
+    descendantpmwidget.cpp
+    dynamictreewidget.cpp
+    kidentityproxymodelwidget.cpp
+    kreparentingproxymodel.cpp
+    lessthanwidget.cpp
+    matchcheckingwidget.cpp
+    modelcommanderwidget.cpp
+    proxyitemselectionwidget.cpp
+    proxymodeltestwidget.cpp
+    selectionpmwidget.cpp
+    # statesaverwidget.cpp
+)
+
+if (TARGET Qt6::Qml)
+    target_sources(proxymodeltestapp PRIVATE
+        reparentingpmwidget.cpp
+        scriptablereparentingwidget.cpp
+    )
+    target_link_libraries(proxymodeltestapp Qt6::Qml)
+endif()
+
+if (TARGET Qt6::QuickWidgets)
+    target_sources(proxymodeltestapp PRIVATE
+        selectioninqmlwidget.cpp
+        descendantqmltree.cpp
+    )
+    target_link_libraries(proxymodeltestapp Qt6::QuickWidgets)
+    target_compile_definitions(proxymodeltestapp PRIVATE -DSRC_DIR="${CMAKE_CURRENT_SOURCE_DIR}")
+endif()
+
+target_link_libraries(proxymodeltestapp
+    KF6::ItemModels
+    proxymodeltestsuite
+    Qt6::Widgets
+)

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/breadcrumbdirectionwidget.cpp

@@ -0,0 +1,94 @@
+/*
+    SPDX-FileCopyrightText: 2010 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.net>
+    SPDX-FileContributor: Stephen Kelly <stephen@kdab.com>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+
+#include "breadcrumbdirectionwidget.h"
+
+#include <dynamictreemodel.h>
+#include <kbreadcrumbselectionmodel.h>
+
+#include <QEvent>
+#include <QHBoxLayout>
+#include <QSplitter>
+#include <QTreeView>
+
+BreadcrumbDirectionWidget::BreadcrumbDirectionWidget(QWidget *parent, Qt::WindowFlags f)
+    : QWidget(parent, f)
+{
+    DynamicTreeModel *rootModel = new DynamicTreeModel(this);
+
+    ModelInsertCommand ins(rootModel);
+    ins.setStartRow(0);
+    ins.interpret(
+        QLatin1String("- 1"
+                      "- 2"
+                      "- - 3"
+                      "- - 3"
+                      "- - - 4"
+                      "- - - 4"
+                      "- - - - 4"
+                      "- - 4"
+                      "- - 5"
+                      "- - - 4"
+                      "- - - - 4"
+                      "- - 5"
+                      "- 6"
+                      "- 7"
+                      "- - 8"
+                      "- - - 9"
+                      "- - - 10"
+                      "- - - - 9"
+                      "- - - - - 10"
+                      "- - - - - - 9"
+                      "- - - - - - 10"
+                      "- - - - - - - 9"
+                      "- - - - - - - - 10"
+                      "- - - - - - - - 9"
+                      "- - - - - - - 10"
+                      "- 20"
+                      "- 21"));
+    ins.doCommand();
+
+    QHBoxLayout *layout = new QHBoxLayout(this);
+    QSplitter *splitter1 = new QSplitter(Qt::Vertical, this);
+    layout->addWidget(splitter1);
+    QSplitter *splitter2 = new QSplitter(splitter1);
+    QSplitter *splitter3 = new QSplitter(splitter1);
+
+    QTreeView *view1 = new QTreeView(splitter2);
+    view1->setModel(rootModel);
+    view1->expandAll();
+    view1->viewport()->setBackgroundRole(QPalette::Button);
+    QTreeView *view2 = new QTreeView(splitter2);
+    view2->setModel(rootModel);
+    view2->expandAll();
+    view2->viewport()->installEventFilter(this);
+    QTreeView *view3 = new QTreeView(splitter3);
+    view3->setModel(rootModel);
+    view3->expandAll();
+    QTreeView *view4 = new QTreeView(splitter3);
+    view4->setModel(rootModel);
+    view4->expandAll();
+    view4->viewport()->installEventFilter(this);
+    view4->viewport()->setBackgroundRole(QPalette::Button);
+
+    KBreadcrumbSelectionModel *breadcrumbSelection1 = new KBreadcrumbSelectionModel(view2->selectionModel(), this);
+    view1->setSelectionModel(breadcrumbSelection1);
+
+    KBreadcrumbSelectionModel *breadcrumbSelection2 =
+        new KBreadcrumbSelectionModel(view3->selectionModel(), KBreadcrumbSelectionModel::MakeBreadcrumbSelectionInOther, this);
+    view4->setSelectionModel(breadcrumbSelection2);
+}
+
+bool BreadcrumbDirectionWidget::eventFilter(QObject *o, QEvent *e)
+{
+    if (e->type() == QEvent::MouseButtonPress || e->type() == QEvent::MouseButtonDblClick || e->type() == QEvent::MouseButtonRelease) {
+        return true;
+    }
+    return QObject::eventFilter(o, e);
+}
+
+#include "moc_breadcrumbdirectionwidget.cpp"

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/breadcrumbdirectionwidget.h

@@ -0,0 +1,23 @@
+/*
+    SPDX-FileCopyrightText: 2010 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.net>
+    SPDX-FileContributor: Stephen Kelly <stephen@kdab.com>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+
+#ifndef BREADCRUMBDIRECTIONWIDGET_H
+#define BREADCRUMBDIRECTIONWIDGET_H
+
+#include <QWidget>
+
+class BreadcrumbDirectionWidget : public QWidget
+{
+    Q_OBJECT
+public:
+    BreadcrumbDirectionWidget(QWidget *parent = nullptr, Qt::WindowFlags f = Qt::WindowFlags());
+
+protected:
+    bool eventFilter(QObject *, QEvent *) override;
+};
+
+#endif

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/breadcrumbnavigationwidget.cpp

@@ -0,0 +1,284 @@
+/*
+    SPDX-FileCopyrightText: 2010 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.net>
+    SPDX-FileContributor: Stephen Kelly <stephen@kdab.com>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+
+#include "breadcrumbnavigationwidget.h"
+
+#include "dynamictreemodel.h"
+#include "dynamictreewidget.h"
+
+#include <QHBoxLayout>
+#include <QListView>
+#include <QSplitter>
+#include <QTreeView>
+
+#include "kbreadcrumbselectionmodel.h"
+#include "kselectionproxymodel.h"
+
+#define SON(object) object->setObjectName(QStringLiteral(#object))
+
+CurrentItemLabel::CurrentItemLabel(QAbstractItemModel *model, QWidget *parent, Qt::WindowFlags f)
+    : QLabel(parent, f)
+    , m_model(model)
+{
+    connect(model, SIGNAL(dataChanged(QModelIndex, QModelIndex)), SLOT(dataChanged(QModelIndex, QModelIndex)));
+    connect(model, SIGNAL(rowsInserted(QModelIndex, int, int)), SLOT(rowsInserted(QModelIndex, int, int)));
+    connect(model, SIGNAL(rowsRemoved(QModelIndex, int, int)), SLOT(rowsRemoved(QModelIndex, int, int)));
+    connect(model, SIGNAL(modelReset()), SLOT(modelReset()));
+
+    if (!m_model->hasChildren()) {
+        setText(QStringLiteral("No selection"));
+    }
+}
+
+void CurrentItemLabel::dataChanged(const QModelIndex &, const QModelIndex &)
+{
+    setText(m_model->index(0, 0).data().toString());
+}
+
+void CurrentItemLabel::rowsInserted(const QModelIndex &, int, int)
+{
+    setText(m_model->index(0, 0).data().toString());
+}
+
+void CurrentItemLabel::rowsRemoved(const QModelIndex &, int, int)
+{
+    if (!m_model->hasChildren()) {
+        setText(QStringLiteral("No selection"));
+        return;
+    }
+    setText(m_model->index(0, 0).data().toString());
+}
+
+void CurrentItemLabel::modelReset()
+{
+    if (!m_model->hasChildren()) {
+        setText(QStringLiteral("No selection"));
+    }
+    setText(m_model->index(0, 0).data().toString());
+}
+
+KBreadcrumbNavigationProxyModel::KBreadcrumbNavigationProxyModel(QItemSelectionModel *selectionModel, QObject *parent)
+    : KSelectionProxyModel(selectionModel, parent)
+{
+}
+
+QVariant KBreadcrumbNavigationProxyModel::data(const QModelIndex &index, int role) const
+{
+    if (rowCount() > 2 && index.row() == 0 && role == Qt::DisplayRole) {
+        QModelIndex sourceIndex = mapToSource(index);
+        QStringList dataList;
+        while (sourceIndex.isValid()) {
+            dataList.prepend(sourceIndex.data().toString());
+            sourceIndex = sourceIndex.parent();
+        }
+        return dataList.join(QLatin1String(" > "));
+    }
+    return KSelectionProxyModel::data(index, role);
+}
+
+void KBreadcrumbNavigationProxyModel::setShowHiddenAscendantData(bool showHiddenAscendantData)
+{
+    m_showHiddenAscendantData = showHiddenAscendantData;
+}
+
+bool KBreadcrumbNavigationProxyModel::showHiddenAscendantData() const
+{
+    return m_showHiddenAscendantData;
+}
+
+KNavigatingProxyModel::KNavigatingProxyModel(QItemSelectionModel *selectionModel, QObject *parent)
+    : KSelectionProxyModel(selectionModel, parent)
+    , m_selectionModel(selectionModel)
+{
+}
+
+void KNavigatingProxyModel::setSourceModel(QAbstractItemModel *sourceModel)
+{
+    connect(m_selectionModel, SIGNAL(selectionChanged(QItemSelection, QItemSelection)), SLOT(navigationSelectionChanged(QItemSelection, QItemSelection)));
+
+    KSelectionProxyModel::setSourceModel(sourceModel);
+    updateNavigation();
+}
+
+void KNavigatingProxyModel::navigationSelectionChanged(const QItemSelection &, const QItemSelection &)
+{
+    updateNavigation();
+}
+
+void KNavigatingProxyModel::updateNavigation()
+{
+    if (!sourceModel()) {
+        return;
+    }
+
+    if (m_selectionModel->selection().isEmpty()) {
+        setFilterBehavior(KSelectionProxyModel::ExactSelection);
+        QModelIndex top = sourceModel()->index(0, 0);
+        QModelIndex bottom = sourceModel()->index(sourceModel()->rowCount() - 1, 0);
+
+        disconnect(m_selectionModel,
+                   SIGNAL(selectionChanged(QItemSelection, QItemSelection)),
+                   this,
+                   SLOT(navigationSelectionChanged(QItemSelection, QItemSelection)));
+        m_selectionModel->select(QItemSelection(top, bottom), QItemSelectionModel::Select);
+        connect(m_selectionModel, SIGNAL(selectionChanged(QItemSelection, QItemSelection)), SLOT(navigationSelectionChanged(QItemSelection, QItemSelection)));
+    } else if (filterBehavior() != KSelectionProxyModel::ChildrenOfExactSelection) {
+        setFilterBehavior(KSelectionProxyModel::ChildrenOfExactSelection);
+    }
+}
+
+void KNavigatingProxyModel::modelReset()
+{
+    updateNavigation();
+}
+
+QVariant KNavigatingProxyModel::data(const QModelIndex &index, int role) const
+{
+    if (role == Qt::DisplayRole && sourceModel()->hasChildren(mapToSource(index))) {
+        return QString("+ " + KSelectionProxyModel::data(index, role).toString());
+    }
+    return KSelectionProxyModel::data(index, role);
+}
+
+KForwardingItemSelectionModel::KForwardingItemSelectionModel(QAbstractItemModel *model, QItemSelectionModel *selectionModel, QObject *parent)
+    : QItemSelectionModel(model, parent)
+    , m_selectionModel(selectionModel)
+    , m_direction(Forward)
+{
+    Q_ASSERT(model == selectionModel->model());
+    connect(selectionModel, SIGNAL(selectionChanged(QItemSelection, QItemSelection)), SLOT(navigationSelectionChanged(QItemSelection, QItemSelection)));
+}
+
+KForwardingItemSelectionModel::KForwardingItemSelectionModel(QAbstractItemModel *model,
+                                                             QItemSelectionModel *selectionModel,
+                                                             Direction direction,
+                                                             QObject *parent)
+    : QItemSelectionModel(model, parent)
+    , m_selectionModel(selectionModel)
+    , m_direction(direction)
+{
+    Q_ASSERT(model == selectionModel->model());
+    if (m_direction == Forward) {
+        connect(selectionModel, SIGNAL(selectionChanged(QItemSelection, QItemSelection)), SLOT(navigationSelectionChanged(QItemSelection, QItemSelection)));
+    }
+}
+
+void KForwardingItemSelectionModel::select(const QModelIndex &index, QItemSelectionModel::SelectionFlags command)
+{
+    if (m_direction == Reverse) {
+        m_selectionModel->select(index, command);
+    } else {
+        QItemSelectionModel::select(index, command);
+    }
+}
+
+void KForwardingItemSelectionModel::select(const QItemSelection &selection, QItemSelectionModel::SelectionFlags command)
+{
+    if (m_direction == Reverse) {
+        m_selectionModel->select(selection, command);
+    } else {
+        QItemSelectionModel::select(selection, command);
+    }
+}
+
+void KForwardingItemSelectionModel::navigationSelectionChanged(const QItemSelection &selected, const QItemSelection &)
+{
+    select(selected, ClearAndSelect);
+}
+
+BreadcrumbNavigationWidget::BreadcrumbNavigationWidget(QWidget *parent, Qt::WindowFlags f)
+    : QWidget(parent, f)
+{
+    DynamicTreeModel *rootModel = new DynamicTreeModel(this);
+    QSplitter *splitter = new QSplitter(this);
+    QHBoxLayout *layout = new QHBoxLayout(this);
+    layout->addWidget(splitter);
+
+    DynamicTreeWidget *dynamicTree = new DynamicTreeWidget(rootModel, splitter);
+    dynamicTree->treeView()->setSelectionMode(QAbstractItemView::SingleSelection);
+    dynamicTree->setInitialTree(
+        QLatin1String("- 1"
+                      "- - 2"
+                      "- - 2"
+                      "- - - 3"
+                      "- - - - 4"
+                      "- - - - - 5"
+                      "- - 2"
+                      "- 6"
+                      "- 6"
+                      "- 6"
+                      "- - 7"
+                      "- - - 8"
+                      "- - - 8"
+                      "- - - - 9"
+                      "- - - - - 10"
+                      "- - - 8"
+                      "- - - 8"
+                      "- - 8"
+                      "- 16"
+                      "- - 17"
+                      "- - - 18"
+                      "- - - - 19"
+                      "- - - - - 20"));
+
+    QList<QItemSelectionModel *> selectionModelList;
+
+    QSplitter *vSplitter = new QSplitter(Qt::Vertical, splitter);
+
+    QItemSelectionModel *rootSelectionModel = new QItemSelectionModel(rootModel, this);
+    SON(rootSelectionModel);
+
+    dynamicTree->treeView()->setSelectionModel(rootSelectionModel);
+
+    KBreadcrumbSelectionModel *breadcrumbOnlyProxySelector2 =
+        new KBreadcrumbSelectionModel(rootSelectionModel, KBreadcrumbSelectionModel::MakeBreadcrumbSelectionInOther, this);
+    SON(breadcrumbOnlyProxySelector2);
+    breadcrumbOnlyProxySelector2->setActualSelectionIncluded(false);
+
+    KBreadcrumbNavigationProxyModel *breadcrumbNavigationModel = new KBreadcrumbNavigationProxyModel(breadcrumbOnlyProxySelector2, this);
+    SON(breadcrumbNavigationModel);
+    breadcrumbNavigationModel->setSourceModel(rootModel);
+    breadcrumbNavigationModel->setFilterBehavior(KSelectionProxyModel::ExactSelection);
+
+    QListView *breadcrumbView = new QListView(vSplitter);
+    //   SON(breadcrumbNavigationModel);
+    breadcrumbView->setModel(breadcrumbNavigationModel);
+
+    // This shouldn't operate on rootSelectionModel. It should operate on oneway instead?
+    KLinkItemSelectionModel *breadcrumbViewSelectionModel = new KLinkItemSelectionModel(breadcrumbNavigationModel, rootSelectionModel, this);
+    SON(breadcrumbViewSelectionModel);
+
+    KForwardingItemSelectionModel *oneway2 =
+        new KForwardingItemSelectionModel(breadcrumbNavigationModel, breadcrumbViewSelectionModel, KForwardingItemSelectionModel::Reverse);
+    SON(oneway2);
+
+    breadcrumbView->setSelectionModel(oneway2);
+
+    KSelectionProxyModel *currentItemSelectionModel = new KSelectionProxyModel(rootSelectionModel, this);
+    currentItemSelectionModel->setFilterBehavior(KSelectionProxyModel::ExactSelection);
+    currentItemSelectionModel->setSourceModel(rootModel);
+    SON(currentItemSelectionModel);
+
+    new CurrentItemLabel(currentItemSelectionModel, vSplitter);
+
+    QListView *selectionView = new QListView(vSplitter);
+
+    // Need a one-way connection from rootSelectionModel to rootSelectionModel2
+
+    KForwardingItemSelectionModel *oneway = new KForwardingItemSelectionModel(rootModel, rootSelectionModel);
+
+    KNavigatingProxyModel *navigatingProxyModel = new KNavigatingProxyModel(oneway, this);
+    SON(navigatingProxyModel);
+    navigatingProxyModel->setSourceModel(rootModel);
+    selectionView->setModel(navigatingProxyModel);
+
+    KLinkItemSelectionModel *selectedChildrenSelectionModel = new KLinkItemSelectionModel(navigatingProxyModel, rootSelectionModel, this);
+
+    selectionView->setSelectionModel(selectedChildrenSelectionModel);
+}
+
+#include "moc_breadcrumbnavigationwidget.cpp"

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/breadcrumbnavigationwidget.h

@@ -0,0 +1,100 @@
+/*
+    SPDX-FileCopyrightText: 2010 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.net>
+    SPDX-FileContributor: Stephen Kelly <stephen@kdab.com>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+
+#ifndef BREADCRUMBNAVIGATION_WIDGET_H
+#define BREADCRUMBNAVIGATION_WIDGET_H
+
+#include "klinkitemselectionmodel.h"
+#include <kselectionproxymodel.h>
+
+#include <QItemSelection>
+#include <QLabel>
+#include <QWidget>
+
+class CurrentItemLabel : public QLabel
+{
+    Q_OBJECT
+public:
+    CurrentItemLabel(QAbstractItemModel *model, QWidget *parent = nullptr, Qt::WindowFlags f = Qt::WindowFlags());
+
+private Q_SLOTS:
+    void rowsInserted(const QModelIndex &parent, int start, int end);
+    void rowsRemoved(const QModelIndex &parent, int start, int end);
+    void dataChanged(const QModelIndex &topLeft, const QModelIndex &bottomRight);
+    void modelReset();
+
+private:
+    QAbstractItemModel *m_model;
+};
+
+class KBreadcrumbNavigationProxyModel : public KSelectionProxyModel
+{
+    Q_OBJECT
+public:
+    KBreadcrumbNavigationProxyModel(QItemSelectionModel *selectionModel, QObject *parent = nullptr);
+
+    void setShowHiddenAscendantData(bool showHiddenAscendantData);
+    bool showHiddenAscendantData() const;
+
+    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;
+
+private:
+    bool m_showHiddenAscendantData;
+};
+
+class KNavigatingProxyModel : public KSelectionProxyModel
+{
+    Q_OBJECT
+public:
+    KNavigatingProxyModel(QItemSelectionModel *selectionModel, QObject *parent = nullptr);
+
+    void setSourceModel(QAbstractItemModel *sourceModel) override;
+
+    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;
+
+private Q_SLOTS:
+    void modelReset();
+    void updateNavigation();
+    void navigationSelectionChanged(const QItemSelection &, const QItemSelection &);
+
+private:
+private:
+    using KSelectionProxyModel::setFilterBehavior;
+
+    QItemSelectionModel *m_selectionModel;
+};
+
+class KForwardingItemSelectionModel : public QItemSelectionModel
+{
+    Q_OBJECT
+public:
+    enum Direction {
+        Forward,
+        Reverse,
+    };
+    KForwardingItemSelectionModel(QAbstractItemModel *model, QItemSelectionModel *selectionModel, QObject *parent = nullptr);
+    KForwardingItemSelectionModel(QAbstractItemModel *model, QItemSelectionModel *selectionModel, Direction direction, QObject *parent = nullptr);
+
+    void select(const QModelIndex &index, SelectionFlags command) override;
+    void select(const QItemSelection &selection, SelectionFlags command) override;
+
+private Q_SLOTS:
+    void navigationSelectionChanged(const QItemSelection &selected, const QItemSelection &deselected);
+
+private:
+    QItemSelectionModel *m_selectionModel;
+    Direction m_direction;
+};
+
+class BreadcrumbNavigationWidget : public QWidget
+{
+    Q_OBJECT
+public:
+    BreadcrumbNavigationWidget(QWidget *parent = nullptr, Qt::WindowFlags f = Qt::WindowFlags());
+};
+
+#endif

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/breadcrumbswidget.cpp

@@ -0,0 +1,137 @@
+/*
+    SPDX-FileCopyrightText: 2010 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.net>
+    SPDX-FileContributor: Stephen Kelly <stephen@kdab.com>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+
+#include "breadcrumbswidget.h"
+
+#include "dynamictreemodel.h"
+#include "dynamictreewidget.h"
+
+#include <QHBoxLayout>
+#include <QListView>
+#include <QSplitter>
+#include <QTreeView>
+
+#include "kbreadcrumbselectionmodel.h"
+#include "kselectionproxymodel.h"
+
+MultiSelectionModel::MultiSelectionModel(QAbstractItemModel *model, QList<QItemSelectionModel *> selectionModels, QObject *parent)
+    : QItemSelectionModel(model, parent)
+    , m_selectionModels(selectionModels)
+{
+}
+
+void MultiSelectionModel::select(const QModelIndex &index, QItemSelectionModel::SelectionFlags command)
+{
+    for (QItemSelectionModel *selectionModel : std::as_const(m_selectionModels)) {
+        selectionModel->select(index, command);
+    }
+    QItemSelectionModel::select(index, command);
+}
+
+void MultiSelectionModel::select(const QItemSelection &selection, QItemSelectionModel::SelectionFlags command)
+{
+    for (QItemSelectionModel *selectionModel : std::as_const(m_selectionModels)) {
+        selectionModel->select(selection, command);
+    }
+    QItemSelectionModel::select(selection, command);
+}
+
+BreadcrumbsWidget::BreadcrumbsWidget(QWidget *parent, Qt::WindowFlags f)
+    : QWidget(parent, f)
+{
+    DynamicTreeModel *rootModel = new DynamicTreeModel(this);
+    QSplitter *splitter = new QSplitter(this);
+    QHBoxLayout *layout = new QHBoxLayout(this);
+    layout->addWidget(splitter);
+
+    DynamicTreeWidget *dynamicTree = new DynamicTreeWidget(rootModel, splitter);
+    dynamicTree->treeView()->setSelectionMode(QAbstractItemView::SingleSelection);
+    dynamicTree->setInitialTree(
+        QLatin1String("- 1"
+                      "- - 2"
+                      "- - 2"
+                      "- - - 3"
+                      "- - - - 4"
+                      "- - - - - 5"
+                      "- - 2"
+                      "- 6"
+                      "- 6"
+                      "- 6"
+                      "- - 7"
+                      "- - - 8"
+                      "- - - 8"
+                      "- - - - 9"
+                      "- - - - - 10"
+                      "- - - 8"
+                      "- - - 8"
+                      "- - 8"
+                      "- 16"
+                      "- - 17"
+                      "- - - 18"
+                      "- - - - 19"
+                      "- - - - - 20"));
+
+    QList<QItemSelectionModel *> selectionModelList;
+    QItemSelectionModel *fullBreadcrumbSelectionModel = new QItemSelectionModel(rootModel, this);
+
+    KBreadcrumbSelectionModel *fullBreadcrumbProxySelector = new KBreadcrumbSelectionModel(fullBreadcrumbSelectionModel, this);
+    selectionModelList << fullBreadcrumbProxySelector;
+
+    KSelectionProxyModel *fullBreadCrumbSelectionProxyModel = new KSelectionProxyModel(fullBreadcrumbSelectionModel, this);
+    fullBreadCrumbSelectionProxyModel->setSourceModel(rootModel);
+    fullBreadCrumbSelectionProxyModel->setFilterBehavior(KSelectionProxyModel::ExactSelection);
+
+    QListView *fullBreadcrumbProxyView = new QListView(splitter);
+    fullBreadcrumbProxyView->setModel(fullBreadCrumbSelectionProxyModel);
+
+    QItemSelectionModel *breadcrumbOnlySelectionModel = new QItemSelectionModel(rootModel, this);
+
+    KBreadcrumbSelectionModel *breadcrumbOnlyProxySelector = new KBreadcrumbSelectionModel(breadcrumbOnlySelectionModel, this);
+    breadcrumbOnlyProxySelector->setActualSelectionIncluded(false);
+    selectionModelList << breadcrumbOnlyProxySelector;
+
+    KSelectionProxyModel *breadcrumbOnlySelectionProxyModel = new KSelectionProxyModel(breadcrumbOnlySelectionModel, this);
+    breadcrumbOnlySelectionProxyModel->setSourceModel(rootModel);
+    breadcrumbOnlySelectionProxyModel->setFilterBehavior(KSelectionProxyModel::ExactSelection);
+
+    QListView *breadcrumbOnlyProxyView = new QListView(splitter);
+    breadcrumbOnlyProxyView->setModel(breadcrumbOnlySelectionProxyModel);
+
+    int selectionDepth = 2;
+
+    QItemSelectionModel *thisAndAscendantsSelectionModel = new QItemSelectionModel(rootModel, this);
+
+    KBreadcrumbSelectionModel *thisAndAscendantsProxySelector = new KBreadcrumbSelectionModel(thisAndAscendantsSelectionModel, this);
+    thisAndAscendantsProxySelector->setBreadcrumbLength(selectionDepth);
+    selectionModelList << thisAndAscendantsProxySelector;
+
+    KSelectionProxyModel *thisAndAscendantsSelectionProxyModel = new KSelectionProxyModel(thisAndAscendantsSelectionModel, this);
+    thisAndAscendantsSelectionProxyModel->setSourceModel(rootModel);
+    thisAndAscendantsSelectionProxyModel->setFilterBehavior(KSelectionProxyModel::ExactSelection);
+
+    QListView *thisAndAscendantsProxyView = new QListView(splitter);
+    thisAndAscendantsProxyView->setModel(thisAndAscendantsSelectionProxyModel);
+
+    QItemSelectionModel *ascendantsOnlySelectionModel = new QItemSelectionModel(rootModel, this);
+
+    KBreadcrumbSelectionModel *ascendantsOnlyProxySelector = new KBreadcrumbSelectionModel(ascendantsOnlySelectionModel, this);
+    ascendantsOnlyProxySelector->setActualSelectionIncluded(false);
+    ascendantsOnlyProxySelector->setBreadcrumbLength(selectionDepth);
+    selectionModelList << ascendantsOnlyProxySelector;
+
+    KSelectionProxyModel *ascendantsOnlySelectionProxyModel = new KSelectionProxyModel(ascendantsOnlySelectionModel, this);
+    ascendantsOnlySelectionProxyModel->setSourceModel(rootModel);
+    ascendantsOnlySelectionProxyModel->setFilterBehavior(KSelectionProxyModel::ExactSelection);
+
+    QListView *ascendantsOnlyProxyView = new QListView(splitter);
+    ascendantsOnlyProxyView->setModel(ascendantsOnlySelectionProxyModel);
+
+    MultiSelectionModel *multiSelectionModel = new MultiSelectionModel(rootModel, selectionModelList, this);
+    dynamicTree->treeView()->setSelectionModel(multiSelectionModel);
+}
+
+#include "moc_breadcrumbswidget.cpp"

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/breadcrumbswidget.h

@@ -0,0 +1,38 @@
+/*
+    SPDX-FileCopyrightText: 2010 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.net>
+    SPDX-FileContributor: Stephen Kelly <stephen@kdab.com>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+
+#ifndef BREADCRUMBS_WIDGET_H
+#define BREADCRUMBS_WIDGET_H
+
+#include <QItemSelection>
+#include <QWidget>
+#include <kselectionproxymodel.h>
+
+#include "klinkitemselectionmodel.h"
+
+class MultiSelectionModel : public QItemSelectionModel
+{
+    Q_OBJECT
+public:
+    MultiSelectionModel(QAbstractItemModel *model, QList<QItemSelectionModel *> selectionModels, QObject *parent = nullptr);
+
+public:
+    void select(const QModelIndex &index, SelectionFlags command) override;
+    void select(const QItemSelection &selection, SelectionFlags command) override;
+
+private:
+    QList<QItemSelectionModel *> m_selectionModels;
+};
+
+class BreadcrumbsWidget : public QWidget
+{
+    Q_OBJECT
+public:
+    BreadcrumbsWidget(QWidget *parent = nullptr, Qt::WindowFlags f = Qt::WindowFlags());
+};
+
+#endif

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/checkablewidget.cpp

@@ -0,0 +1,71 @@
+/*
+    SPDX-FileCopyrightText: 2010 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.net>
+    SPDX-FileContributor: Stephen Kelly <stephen@kdab.com>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+
+#include "checkablewidget.h"
+
+#include <QHBoxLayout>
+#include <QSplitter>
+#include <QTreeView>
+
+#include "dynamictreemodel.h"
+#include <kcheckableproxymodel.h>
+#include <kselectionproxymodel.h>
+
+CheckableWidget::CheckableWidget(QWidget *parent, Qt::WindowFlags f)
+    : QWidget(parent, f)
+{
+    QHBoxLayout *layout = new QHBoxLayout(this);
+    QSplitter *vSplitter = new QSplitter(this);
+    layout->addWidget(vSplitter);
+
+    DynamicTreeModel *rootModel = new DynamicTreeModel(this);
+
+    ModelInsertCommand *insert = new ModelInsertCommand(rootModel, this);
+    insert->setStartRow(0);
+    insert->interpret(
+        QLatin1String("- 1"
+                      "- 1"
+                      "- 1"
+                      "- - 2"
+                      "- - 2"
+                      "- - 2"
+                      "- - 2"
+                      "- 1"
+                      "- 1"
+                      "- 1"
+                      "- - 2"
+                      "- - - 3"
+                      "- - - - 4"
+                      "- - - - 4"
+                      "- - - 3"
+                      "- - - 3"
+                      "- - - 3"
+                      "- - 2"
+                      "- - 2"
+                      "- - 2"
+                      "- 1"
+                      "- 1"));
+    insert->doCommand();
+
+    QItemSelectionModel *checkModel = new QItemSelectionModel(rootModel, this);
+    KCheckableProxyModel *checkable = new KCheckableProxyModel(this);
+    checkable->setSourceModel(rootModel);
+    checkable->setSelectionModel(checkModel);
+
+    QTreeView *tree1 = new QTreeView(vSplitter);
+    tree1->setModel(checkable);
+    tree1->expandAll();
+
+    KSelectionProxyModel *selectionProxy = new KSelectionProxyModel(checkModel, this);
+    selectionProxy->setFilterBehavior(KSelectionProxyModel::ExactSelection);
+    selectionProxy->setSourceModel(rootModel);
+
+    QTreeView *tree2 = new QTreeView(vSplitter);
+    tree2->setModel(selectionProxy);
+}
+
+#include "moc_checkablewidget.cpp"

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/checkablewidget.h

@@ -0,0 +1,20 @@
+/*
+    SPDX-FileCopyrightText: 2010 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.net>
+    SPDX-FileContributor: Stephen Kelly <stephen@kdab.com>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+
+#ifndef CHECKABLEWIDGET_H
+#define CHECKABLEWIDGET_H
+
+#include <QWidget>
+
+class CheckableWidget : public QWidget
+{
+    Q_OBJECT
+public:
+    CheckableWidget(QWidget *parent = nullptr, Qt::WindowFlags f = Qt::WindowFlags());
+};
+
+#endif

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/descendantpmwidget.cpp

@@ -0,0 +1,151 @@
+/*
+    This file is part of the proxy model test suite.
+
+    SPDX-FileCopyrightText: 2009 Stephen Kelly <steveire@gmail.com>
+
+    SPDX-License-Identifier: LGPL-2.1-or-later
+*/
+
+#include "descendantpmwidget.h"
+
+#include <QSplitter>
+#include <QTreeView>
+
+#include "dynamictreemodel.h"
+#include "dynamictreewidget.h"
+#include "kdescendantsproxymodel.h"
+#include <QHBoxLayout>
+#include <QLineEdit>
+
+#include "modeleventlogger.h"
+
+DescendantProxyModelWidget::DescendantProxyModelWidget(QWidget *parent)
+    : QWidget(parent)
+{
+    QHBoxLayout *layout = new QHBoxLayout(this);
+    QSplitter *vSplitter = new QSplitter(this);
+    layout->addWidget(vSplitter);
+
+    m_rootModel = new DynamicTreeModel(this);
+
+    DynamicTreeWidget *dynTreeWidget = new DynamicTreeWidget(m_rootModel, vSplitter);
+
+    dynTreeWidget->setInitialTree(
+        QLatin1String("- 1"
+                      "- 2"
+                      "- - 3"
+                      "- - 3"
+                      "- - - 4"
+                      "- - - 4"
+                      "- - - - 4"
+                      "- - 4"
+                      "- - 5"
+                      "- - - 4"
+                      "- - - - 4"
+                      "- - 5"
+                      "- 6"
+                      "- 7"
+                      "- - 8"
+                      "- - - 9"
+                      "- - - 10"
+                      "- - - - 9"
+                      "- - - - - 10"
+                      "- - - - - - 9"
+                      "- - - - - - 10"
+                      "- - - - - - - 9"
+                      "- - - - - - - - 10"
+                      "- - - - - - - - 9"
+                      "- - - - - - - 10"
+                      "- - - - - 9"
+                      "- - - - - 9"
+                      "- - - - - 9"
+                      "- - - - - 10"
+                      "- - - - - - 9"
+                      "- - - - - - 10"
+                      "- - - - - 9"
+                      "- - - - - 9"
+                      "- - - - - 9"
+                      "- - - - - 10"
+                      "- - - - - - 9"
+                      "- - - - - - 10"
+                      "- - - - 10"
+                      "- - 11"
+                      "- - 12"
+                      "- 13"
+                      "- 14"
+                      "- 15"
+                      "- - 16"
+                      "- - - 17"
+                      "- - - 18"
+                      "- 19"
+                      "- 20"
+                      "- 21"));
+
+    m_eventLogger = new ModelEventLogger(m_rootModel, this);
+
+    m_descProxyModel = new KDescendantsProxyModel(this);
+    m_descProxyModel->setSourceModel(m_rootModel);
+
+    //   KDescendantsProxyModel *descProxyModel2 = new KDescendantsProxyModel(this);
+    //   descProxyModel2->setSourceModel(m_rootModel);
+    //   descProxyModel2->setDisplayAncestorData(true);
+
+    //   QTreeView *treeview = new QTreeView( vSplitter );
+    //   treeview->setModel(m_rootModel);
+    //   treeview->setSelectionMode(QAbstractItemView::ExtendedSelection);
+
+    m_descView = new QTreeView(vSplitter);
+    m_descView->setModel(m_descProxyModel);
+
+    //   QTreeView *descView2 = new QTreeView( vSplitter );
+    //   descView2->setModel(descProxyModel2);
+
+    //   QWidget *w = new QWidget(vSplitter);
+    //   QVBoxLayout *vLayout = new QVBoxLayout(w);
+    //   QTreeView *matchView = new QTreeView(w);
+    //   matchView->setModel(m_selectionProxyModel);
+    //   m_lineEdit = new QLineEdit(w);
+    //   connect(m_lineEdit, SIGNAL(textChanged(QString)), SLOT(doMatch(QString)));
+    //   connect(m_descView->selectionModel(), SIGNAL(selectionChanged(QItemSelection,QItemSelection)), SLOT(refreshMatch()));
+
+    //   vLayout->addWidget(m_lineEdit);
+    //   vLayout->addWidget(matchView);
+}
+
+DescendantProxyModelWidget::~DescendantProxyModelWidget()
+{
+}
+
+void DescendantProxyModelWidget::doMatch(const QString &matchData)
+{
+    Q_UNUSED(matchData);
+#if 0
+    m_itemSelectionModel->clearSelection();
+
+    if (matchData.isEmpty()) {
+        return;
+    }
+
+    QModelIndex start = m_descView->currentIndex();
+
+    if (!start.isValid()) {
+        start = m_descProxyModel->index(0, 0);
+    }
+
+    // TODO: get from user.
+    int hits = -1;
+
+    QModelIndexList matches = m_descProxyModel->match(start, Qt::DisplayRole, matchData, hits, Qt::MatchContains);
+
+    Q_FOREACH (const QModelIndex &matchingIndex, matches) {
+        m_itemSelectionModel->select(matchingIndex, QItemSelectionModel::Select | QItemSelectionModel::Rows);
+    }
+#endif
+}
+
+void DescendantProxyModelWidget::refreshMatch()
+{
+    doMatch(m_lineEdit->text());
+}
+
+#include "moc_descendantpmwidget.cpp"

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/descendantpmwidget.h

@@ -0,0 +1,45 @@
+/*
+    This file is part of the proxy model test suite.
+
+    SPDX-FileCopyrightText: 2009 Stephen Kelly <steveire@gmail.com>
+
+    SPDX-License-Identifier: LGPL-2.1-or-later
+*/
+
+#ifndef DESCENDANTPM_WIDGET_H
+#define DESCENDANTPM_WIDGET_H
+
+#include <QWidget>
+
+class DynamicTreeModel;
+class QTreeView;
+class QLineEdit;
+class QItemSelectionModel;
+
+class KDescendantsProxyModel;
+class KSelectionProxyModel;
+
+class ModelEventLogger;
+
+class DescendantProxyModelWidget : public QWidget
+{
+    Q_OBJECT
+public:
+    DescendantProxyModelWidget(QWidget *parent = nullptr);
+    ~DescendantProxyModelWidget() override;
+
+protected Q_SLOTS:
+    void doMatch(const QString &matchData);
+    void refreshMatch();
+
+private:
+    DynamicTreeModel *m_rootModel;
+    ModelEventLogger *m_eventLogger;
+    KDescendantsProxyModel *m_descProxyModel;
+    KSelectionProxyModel *m_selectionProxyModel;
+    QItemSelectionModel *m_itemSelectionModel;
+    QTreeView *m_descView;
+    QLineEdit *m_lineEdit;
+};
+
+#endif

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/descendantqmltree.cpp

@@ -0,0 +1,41 @@
+/*
+    This file is part of the proxy model test suite.
+
+    SPDX-FileCopyrightText: 2020 Marco Martin <mart@kde.org>
+
+    SPDX-License-Identifier: LGPL-2.1-or-later
+*/
+
+#include "descendantqmltree.h"
+
+#include <QHBoxLayout>
+#include <QLabel>
+#include <QQmlContext>
+#include <QQmlEngine>
+#include <QQuickWidget>
+#include <QSplitter>
+#include <QTreeView>
+
+#include "dynamictreemodel.h"
+#include "dynamictreewidget.h"
+#include "kselectionproxymodel.h"
+
+DescendantQmlTreeWidget::DescendantQmlTreeWidget(QWidget *parent)
+    : QWidget(parent)
+{
+    QHBoxLayout *layout = new QHBoxLayout(this);
+    QSplitter *splitter = new QSplitter(this);
+    layout->addWidget(splitter);
+
+    m_rootModel = new DynamicTreeModel(this);
+
+    new DynamicTreeWidget(m_rootModel, splitter);
+
+    qmlRegisterType<KSelectionProxyModel>("KF5ItemModels", 1, 0, "SelectionProxyModel");
+
+    QQuickWidget *quickView = new QQuickWidget(splitter);
+
+    quickView->engine()->rootContext()->setContextProperty(QStringLiteral("_model"), m_rootModel);
+
+    quickView->setSource(QUrl::fromLocalFile(QLatin1String(SRC_DIR "/tree.qml")));
+}

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/descendantqmltree.h

@@ -0,0 +1,27 @@
+/*
+    This file is part of the proxy model test suite.
+
+    SPDX-FileCopyrightText: 2020 Marco Martin <mart@kde.org>
+
+    SPDX-License-Identifier: LGPL-2.1-or-later
+*/
+
+#ifndef DESCENDANTQMLTREE_H
+#define DESCENDANTQMLTREE_H
+
+#include <QWidget>
+
+class QTreeView;
+
+class DynamicTreeModel;
+
+class DescendantQmlTreeWidget : public QWidget
+{
+public:
+    DescendantQmlTreeWidget(QWidget *parent = nullptr);
+
+private:
+    DynamicTreeModel *m_rootModel;
+};
+
+#endif

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/dynamictreewidget.cpp

@@ -0,0 +1,366 @@
+/*
+    SPDX-FileCopyrightText: 2009 Stephen Kelly <steveire@gmail.com>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+
+#include "dynamictreewidget.h"
+
+#include <QComboBox>
+#include <QDebug>
+#include <QHBoxLayout>
+#include <QPlainTextEdit>
+#include <QPushButton>
+#include <QRadioButton>
+#include <QTabWidget>
+#include <QTreeView>
+
+#include "dynamictreemodel.h"
+
+static const char *const treePredefinesNames[] = {"Flat List", "Straight Line Tree", "Dragon Teeth 1", "Dragon Teeth 2", "Random Tree 1"};
+
+static const char *const treePredefinesContent[] = {
+    " - 1"
+    " - 1"
+    " - 1"
+    " - 1"
+    " - 1"
+    " - 1"
+    " - 1"
+    " - 1"
+    " - 1"
+    " - 1"
+    " - 1"
+    " - 1"
+    " - 1"
+    " - 1"
+    " - 1"
+    " - 1",
+
+    " - 1"
+    " - - 1"
+    " - - - 1"
+    " - - - - 1"
+    " - - - - - 1"
+    " - - - - - - 1"
+    " - - - - - - - 1"
+    " - - - - - - - - 1"
+    " - - - - - - - - - 1"
+    " - - - - - - - - - - 1"
+    " - - - - - - - - - - - 1"
+    " - - - - - - - - - - - - 1"
+    " - - - - - - - - - - - - - 1"
+    " - - - - - - - - - - - - - - 1"
+    " - - - - - - - - - - - - - - - 1"
+    " - - - - - - - - - - - - - - - - 1",
+
+    " - 1"
+    " - - 1"
+    " - - - 1"
+    " - - - - 1"
+    " - 1"
+    " - - 1"
+    " - - - 1"
+    " - - - - 1"
+    " - 1"
+    " - - 1"
+    " - - - 1"
+    " - - - - 1"
+    " - 1"
+    " - - 1"
+    " - - - 1"
+    " - - - - 1",
+
+    " - 1"
+    " - - 1"
+    " - - - 1"
+    " - - - - 1"
+    " - - - - - 1"
+    " - 1"
+    " - - 1"
+    " - - - 1"
+    " - - - - 1"
+    " - - - - - 1"
+    " - 1"
+    " - - 1"
+    " - - - 1"
+    " - - - - 1"
+    " - - - - - 1"
+    " - 1"
+    " - - 1"
+    " - - - 1"
+    " - - - - 1"
+    " - - - - - 1",
+
+    " - 1"
+    " - 2"
+    " - - 3"
+    " - - - 4"
+    " - 5"
+    " - 6"
+    " - 7"
+    " - - 8"
+    " - - - 9"
+    " - - - 10"
+    " - - - - 11"
+    " - - - 12"
+    " - - - - 13"
+    " - 14"
+    " - 15"};
+
+static const char *const insertSubTreePredefinesNames[] = {"Flat List", "Straight Line Tree", "Dragon Teeth 1", "Dragon Teeth 2", "Random Tree 1"};
+
+static const char *const insertSubTreePredefinesContent[] = {
+    " - 1\n"
+    " - 1\n"
+    " - 1\n"
+    " - 1\n",
+
+    " - 1\n"
+    " - - 1\n"
+    " - - - 1\n"
+    " - - - - 1\n",
+
+    " - 1\n"
+    " - - 1\n"
+    " - 1\n"
+    " - - 1\n",
+
+    " - 1\n"
+    " - - 1\n"
+    " - - - 1\n"
+    " - 1\n"
+    " - - 1\n"
+    " - - - 1\n",
+
+    " - 1\n"
+    " - 2\n"
+    " - - 3\n"
+    " - - - 4\n"
+    " - 5\n"};
+
+DynamicTreeWidget::DynamicTreeWidget(DynamicTreeModel *rootModel, QWidget *parent, Qt::WindowFlags f)
+    : QWidget(parent, f)
+    , m_dynamicTreeModel(rootModel)
+{
+    QTabWidget *tabWidget = new QTabWidget(this);
+
+    QHBoxLayout *layout = new QHBoxLayout(this);
+    layout->addWidget(tabWidget);
+
+    QWidget *editContainer = new QWidget(tabWidget);
+    QVBoxLayout *editLayout = new QVBoxLayout(editContainer);
+
+    m_treePredefines = new QComboBox(editContainer);
+    for (uint i = 0; i < sizeof treePredefinesNames / sizeof *treePredefinesNames; ++i) {
+        m_treePredefines->addItem(*(treePredefinesNames + i), *(treePredefinesContent + i));
+    }
+    editLayout->addWidget(m_treePredefines);
+    connect(m_treePredefines, &QComboBox::currentIndexChanged, this, &DynamicTreeWidget::setTreePredefine);
+
+    m_textEdit = new QPlainTextEdit(editContainer);
+    editLayout->addWidget(m_textEdit);
+
+    QWidget *viewContainer = new QWidget(tabWidget);
+
+    QVBoxLayout *viewLayout = new QVBoxLayout(viewContainer);
+
+    m_treeView = new QTreeView(tabWidget);
+    m_treeView->setModel(rootModel);
+    m_treeView->setSelectionMode(QAbstractItemView::ExtendedSelection);
+    m_treeView->setDragDropMode(QAbstractItemView::InternalMove);
+    m_treeView->setDragEnabled(true);
+    m_treeView->setAcceptDrops(true);
+    m_treeView->setDropIndicatorShown(true);
+
+    QPushButton *m_removeButton = new QPushButton(QStringLiteral("Remove"), tabWidget);
+
+    connect(m_removeButton, &QAbstractButton::clicked, this, &DynamicTreeWidget::removeSelected);
+
+    m_insertSubTreePredefines = new QComboBox(this);
+    for (uint i = 0; i < sizeof insertSubTreePredefinesNames / sizeof *insertSubTreePredefinesNames; ++i) {
+        m_insertSubTreePredefines->addItem(*(insertSubTreePredefinesNames + i), *(insertSubTreePredefinesContent + i));
+    }
+    editLayout->addWidget(m_insertSubTreePredefines);
+    connect(m_insertSubTreePredefines, &QComboBox::currentIndexChanged, this, &DynamicTreeWidget::setInsertSubTreePredefine);
+
+    m_insertPatternTextEdit = new QPlainTextEdit(tabWidget);
+    m_insertPatternTextEdit->setMaximumHeight(100);
+
+    m_insertChildren = new QRadioButton(QStringLiteral("Insert Children"), tabWidget);
+    m_insertSiblingsAbove = new QRadioButton(QStringLiteral("Insert Siblings Above"), tabWidget);
+    m_insertSiblingsBelow = new QRadioButton(QStringLiteral("Insert Siblings Below"), tabWidget);
+
+    m_insertChildren->setChecked(true);
+
+    QPushButton *m_insertButton = new QPushButton(QStringLiteral("Insert"), tabWidget);
+
+    connect(m_insertButton, &QAbstractButton::clicked, this, &DynamicTreeWidget::insertSelected);
+
+    QPushButton *m_resetButton = new QPushButton(QStringLiteral("Reset"), tabWidget);
+
+    connect(m_resetButton, &QAbstractButton::clicked, this, &DynamicTreeWidget::resetModel);
+
+    viewLayout->addWidget(m_treeView);
+
+    viewLayout->addWidget(m_removeButton);
+
+    viewLayout->addWidget(m_insertSubTreePredefines);
+    viewLayout->addWidget(m_insertPatternTextEdit);
+    viewLayout->addWidget(m_insertChildren);
+    viewLayout->addWidget(m_insertSiblingsAbove);
+    viewLayout->addWidget(m_insertSiblingsBelow);
+    viewLayout->addWidget(m_insertButton);
+    viewLayout->addWidget(m_resetButton);
+
+    tabWidget->addTab(editContainer, QStringLiteral("Edit"));
+    tabWidget->addTab(viewContainer, QStringLiteral("View"));
+
+    tabWidget->setCurrentIndex(ViewTab);
+
+    connect(tabWidget, &QTabWidget::currentChanged, this, &DynamicTreeWidget::currentChanged);
+    stringToModel(
+        QLatin1String(" - 1"
+                      " - 2"
+                      " - - 3"
+                      " - - 4"
+                      " - - 5"
+                      " - 6"
+                      " - 7"
+                      " - - 8"
+                      " - - - 9"
+                      " - - - 10"
+                      " - - 11"
+                      " - - 12"
+                      " - 13"
+                      " - 14"
+                      " - 15"
+                      " - - 16"
+                      " - - - 17"
+                      " - - - 18"
+                      " - 19"
+                      " - 20"
+                      " - 21"));
+}
+
+void DynamicTreeWidget::setInitialTree(const QString &treeString)
+{
+    stringToModel(treeString);
+}
+
+void DynamicTreeWidget::currentChanged(int index)
+{
+    switch (index) {
+    case EditTab:
+        m_textEdit->setPlainText(modelTreeToString(0, QModelIndex()));
+        break;
+    case ViewTab:
+        if (m_textEdit->document()->isModified()) {
+            stringToModel(m_textEdit->toPlainText());
+        }
+        m_textEdit->document()->setModified(false);
+        break;
+    }
+}
+
+void DynamicTreeWidget::stringToModel(const QString &treeString)
+{
+    if (treeString.isEmpty()) {
+        return;
+    }
+
+    m_dynamicTreeModel->clear();
+    ModelInsertCommand *command = new ModelInsertCommand(m_dynamicTreeModel, this);
+    command->setStartRow(0);
+    command->interpret(treeString);
+    command->doCommand();
+    m_treeView->expandAll();
+}
+
+QString DynamicTreeWidget::modelTreeToString(int depth, const QModelIndex &parent)
+{
+    QString result;
+    QModelIndex idx;
+    static const int column = 0;
+    QString prefix;
+
+    for (int i = 0; i <= depth; ++i) {
+        prefix.append(" -");
+    }
+
+    for (int row = 0; row < m_dynamicTreeModel->rowCount(parent); ++row) {
+        idx = m_dynamicTreeModel->index(row, column, parent);
+        result.append(prefix + " " + idx.data().toString() + "\n");
+        if (m_dynamicTreeModel->hasChildren(idx)) {
+            result.append(modelTreeToString(depth + 1, idx));
+        }
+    }
+    return result;
+}
+
+void DynamicTreeWidget::removeSelected()
+{
+    QModelIndex parent;
+    ModelRemoveCommand *removeCommand = new ModelRemoveCommand(m_dynamicTreeModel, this);
+    QItemSelection selection = m_treeView->selectionModel()->selection();
+    while (!selection.isEmpty()) {
+        const QItemSelectionRange range = selection.takeFirst(); // The selection model will take care of updating persistent indexes.
+        Q_ASSERT(range.isValid());
+        qDebug() << range.parent() << range.top() << range.bottom();
+        removeCommand->setAncestorRowNumbers(m_dynamicTreeModel->indexToPath(range.parent()));
+        removeCommand->setStartRow(range.top());
+        removeCommand->setEndRow(range.bottom());
+
+        qDebug() << m_dynamicTreeModel->indexToPath(range.parent());
+
+        removeCommand->doCommand();
+        selection = m_treeView->selectionModel()->selection();
+    }
+}
+
+void DynamicTreeWidget::insertSelected()
+{
+    const QModelIndexList selectedRows = m_treeView->selectionModel()->selectedRows();
+
+    if (selectedRows.size() != 1) {
+        return;
+    }
+
+    const QModelIndex selectedRow = selectedRows.first();
+
+    ModelInsertCommand *ins = new ModelInsertCommand(m_dynamicTreeModel, this);
+    if (m_insertChildren->isChecked()) {
+        ins->setAncestorRowNumbers(m_dynamicTreeModel->indexToPath(selectedRow));
+        ins->setStartRow(0);
+    } else if (m_insertSiblingsAbove->isChecked()) {
+        ins->setAncestorRowNumbers(m_dynamicTreeModel->indexToPath(selectedRow.parent()));
+        ins->setStartRow(selectedRow.row());
+    } else {
+        Q_ASSERT(m_insertSiblingsBelow->isChecked());
+        ins->setAncestorRowNumbers(m_dynamicTreeModel->indexToPath(selectedRow.parent()));
+        ins->setStartRow(selectedRow.row() + 1);
+    }
+    ins->interpret(m_insertPatternTextEdit->toPlainText());
+    ins->doCommand();
+}
+
+void DynamicTreeWidget::resetModel()
+{
+    ModelResetCommand *resetCommand = new ModelResetCommand(m_dynamicTreeModel, this);
+
+    resetCommand->setInitialTree(m_insertPatternTextEdit->toPlainText().trimmed());
+    resetCommand->doCommand();
+}
+
+void DynamicTreeWidget::setTreePredefine(int index)
+{
+    stringToModel(m_treePredefines->itemData(index).toString());
+    m_textEdit->setPlainText(modelTreeToString(0, QModelIndex()));
+}
+
+void DynamicTreeWidget::setInsertSubTreePredefine(int index)
+{
+    m_insertPatternTextEdit->setPlainText(m_insertSubTreePredefines->itemData(index).toString());
+}
+
+#include "moc_dynamictreewidget.cpp"

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/dynamictreewidget.h

@@ -0,0 +1,74 @@
+/*
+    SPDX-FileCopyrightText: 2009 Stephen Kelly <steveire@gmail.com>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+
+#ifndef DYNAMICTREEWIDGET_H
+#define DYNAMICTREEWIDGET_H
+
+#include <QWidget>
+
+class QModelIndex;
+
+class QComboBox;
+class QPlainTextEdit;
+class QTreeView;
+class QRadioButton;
+
+class DynamicTreeModel;
+
+class DynamicTreeWidget : public QWidget
+{
+    Q_OBJECT
+public:
+    DynamicTreeWidget(DynamicTreeModel *rootModel, QWidget *parent = nullptr, Qt::WindowFlags f = Qt::WindowFlags());
+
+    void setInitialTree(const QString &treeString);
+
+    DynamicTreeModel *model() const
+    {
+        return m_dynamicTreeModel;
+    }
+    QTreeView *treeView() const
+    {
+        return m_treeView;
+    }
+    QPlainTextEdit *textEdit() const
+    {
+        return m_textEdit;
+    }
+
+private Q_SLOTS:
+    void currentChanged(int index);
+    void setTreePredefine(int index);
+    void setInsertSubTreePredefine(int index);
+
+    void removeSelected();
+    void insertSelected();
+    void resetModel();
+
+private:
+    void stringToModel(const QString &treeString);
+    QString modelTreeToString(int depth, const QModelIndex &parent);
+
+private:
+    enum Tab {
+        EditTab,
+        ViewTab,
+    };
+
+    QString m_initialString;
+    DynamicTreeModel *m_dynamicTreeModel;
+    QTreeView *m_treeView;
+    QPlainTextEdit *m_textEdit;
+
+    QPlainTextEdit *m_insertPatternTextEdit;
+    QRadioButton *m_insertChildren;
+    QRadioButton *m_insertSiblingsAbove;
+    QRadioButton *m_insertSiblingsBelow;
+    QComboBox *m_insertSubTreePredefines;
+    QComboBox *m_treePredefines;
+};
+
+#endif

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/kidentityproxymodelwidget.cpp

@@ -0,0 +1,63 @@
+/*
+    SPDX-FileCopyrightText: 2010 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.net>
+    SPDX-FileContributor: Stephen Kelly <stephen@kdab.com>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+
+#include "kidentityproxymodelwidget.h"
+
+#include <QHBoxLayout>
+#include <QIdentityProxyModel>
+#include <QSplitter>
+#include <QTreeView>
+#include <dynamictreemodel.h>
+#include <kbreadcrumbselectionmodel.h>
+
+#include "dynamictreewidget.h"
+
+#include "modeltest.h"
+
+KIdentityProxyModelWidget::KIdentityProxyModelWidget(QWidget *parent, Qt::WindowFlags f)
+    : QWidget(parent, f)
+{
+    QHBoxLayout *layout = new QHBoxLayout(this);
+    QSplitter *splitter = new QSplitter(this);
+    layout->addWidget(splitter);
+
+    DynamicTreeModel *rootModel = new DynamicTreeModel(this);
+
+    DynamicTreeWidget *treeWidget = new DynamicTreeWidget(rootModel, splitter);
+    treeWidget->setInitialTree(
+        QLatin1String(" - 1"
+                      " - 2"
+                      " - - 3"
+                      " - - 4"
+                      " - - 5"
+                      " - 6"
+                      " - 7"
+                      " - - 8"
+                      " - - - 9"
+                      " - - - 10"
+                      " - - 11")
+        //     " - - 12"
+        //     " - 13"
+        //     " - 14"
+        //     " - 15"
+        //     " - - 16"
+        //     " - - - 17"
+        //     " - - - 18"
+        //     " - 19"
+        //     " - 20"
+        //     " - 21"
+    );
+
+    QIdentityProxyModel *proxy = new QIdentityProxyModel(this);
+    proxy->setSourceModel(rootModel);
+
+    QTreeView *view1 = new QTreeView(splitter);
+    view1->setModel(proxy);
+    view1->expandAll();
+}
+
+#include "moc_kidentityproxymodelwidget.cpp"

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/kidentityproxymodelwidget.h

@@ -0,0 +1,20 @@
+/*
+    SPDX-FileCopyrightText: 2010 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.net>
+    SPDX-FileContributor: Stephen Kelly <stephen@kdab.com>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+
+#ifndef KIDENTITYPROXYMODELWIDGET_H
+#define KIDENTITYPROXYMODELWIDGET_H
+
+#include <QWidget>
+
+class KIdentityProxyModelWidget : public QWidget
+{
+    Q_OBJECT
+public:
+    KIdentityProxyModelWidget(QWidget *parent = nullptr, Qt::WindowFlags f = Qt::WindowFlags());
+};
+
+#endif

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/kreparentingproxymodel.h

@@ -0,0 +1,143 @@
+/*
+    SPDX-FileCopyrightText: 2009 Stephen Kelly <steveire@gmail.com>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+
+#ifndef KREPARENTINGPROXYMODEL_H
+#define KREPARENTINGPROXYMODEL_H
+
+#include <QAbstractProxyModel>
+
+class KReparentingProxyModelPrivate;
+
+/**
+  @brief Restructures a source model, changing the parents of items.
+
+  Subclasses can change the structure of a source model by reimplementing
+  the isDescendantOf method.
+
+  For example, if the source model is a list,
+
+  @verbatim
+  0
+  - A
+  - B
+  - C
+  - D
+  - E
+  @endverbatim
+
+  It could be converted to a tree by an implementation something like:
+
+  @code
+  bool MyReparentingModel::isDescedantOf(const QModelIndex& ancestor, const QModelIndex& descendant ) const
+  {
+     return (
+             (ancestor.data().toString() == "A" && descendant.data().toString() == "B")
+          || (ancestor.data().toString() == "A" && descendant.data().toString() == "C")
+          || (ancestor.data().toString() == "B" && descendant.data().toString() == "C")
+          || (ancestor.data().toString() == "A" && descendant.data().toString() == "D")
+          )
+    ? true : KReparentingProxyModel::isDescendantOf(ancestor, descendant);
+  }
+  @endcode
+
+  to get this result:
+
+  @verbatim
+  0
+  - A
+  - - B
+  - - - C
+  - - D
+  - E
+  @endverbatim
+
+  Note that the implementation returns true for a query if "C" is a descendant of "A".
+  The implementation must return the correct value for all of its descendants, not only its direct parent.
+  The actual location to insert the descendant in the tree is determined internally by a binary find algorithm.
+
+  The KReparentingProxyModel performs movement of items in the left-right directions, but not the up-down directions.
+
+  \image html reparenting1.png "KReparentingProxyModel moving rows left to right"
+
+  \image html reparenting2.png "KReparentingProxyModel can not move items both left-right and up-down"
+
+  Reordering the rows in a model is the domain of QSortFilterProxyModel. An intermediate QSortFilterProxyModel
+  can be used to achieve the desired result.
+
+  \image html reparenting3.png "KReparentingProxyModel and QSortFilterProxyModel working in concert to move items both left-right and up-down"
+
+  @code
+    QAbstractItemModel *model = getModel();
+
+    QSortFilterProxyModel *sorter = getSorter();
+    sorter->setSourceModel(model);
+
+    KReparentingProxyModel *reparenter = getReparenter();
+    reparenter->setSourceModel(sorter);
+
+    QTreeView *view = getView();
+    view->setModel(reparenter);
+  @endcode
+
+*/
+class KReparentingProxyModel : public QAbstractProxyModel
+{
+    Q_OBJECT
+public:
+    KReparentingProxyModel(QObject *parent = nullptr);
+
+    ~KReparentingProxyModel() override;
+
+    QModelIndex mapFromSource(const QModelIndex &sourceIndex) const override;
+
+    QModelIndex mapToSource(const QModelIndex &proxyIndex) const override;
+
+    void setSourceModel(QAbstractItemModel *sourceModel) override;
+
+    /**
+      Reimplement this to return whether @p descendant is a descendant of @p ancestor.
+    */
+    virtual bool isDescendantOf(const QModelIndex &ancestor, const QModelIndex &descendant) const;
+
+    int columnCount(const QModelIndex &parent = QModelIndex()) const override;
+
+    QVariant data(const QModelIndex &proxyIndex, int role = Qt::DisplayRole) const override;
+
+    QModelIndex index(int row, int column, const QModelIndex &parent = QModelIndex()) const override;
+
+    QModelIndex parent(const QModelIndex &child) const override;
+
+    int rowCount(const QModelIndex &parent = QModelIndex()) const override;
+
+    bool hasChildren(const QModelIndex &parent = QModelIndex()) const override;
+
+    Qt::DropActions supportedDropActions() const override;
+
+protected:
+    void beginChangeRule();
+    void endChangeRule();
+
+private:
+    Q_DECLARE_PRIVATE(KReparentingProxyModel)
+    //@cond PRIVATE
+    KReparentingProxyModelPrivate *d_ptr;
+
+    Q_PRIVATE_SLOT(d_func(), void sourceRowsAboutToBeInserted(const QModelIndex &, int, int))
+    Q_PRIVATE_SLOT(d_func(), void sourceRowsInserted(const QModelIndex &, int, int))
+    Q_PRIVATE_SLOT(d_func(), void sourceRowsAboutToBeRemoved(const QModelIndex &, int, int))
+    Q_PRIVATE_SLOT(d_func(), void sourceRowsRemoved(const QModelIndex &, int, int))
+    Q_PRIVATE_SLOT(d_func(), void sourceRowsAboutToBeMoved(const QModelIndex &, int, int, const QModelIndex &, int))
+    Q_PRIVATE_SLOT(d_func(), void sourceRowsMoved(const QModelIndex &, int, int, const QModelIndex &, int))
+    Q_PRIVATE_SLOT(d_func(), void sourceModelAboutToBeReset())
+    Q_PRIVATE_SLOT(d_func(), void sourceModelReset())
+    Q_PRIVATE_SLOT(d_func(), void sourceLayoutAboutToBeChanged())
+    Q_PRIVATE_SLOT(d_func(), void sourceLayoutChanged())
+    Q_PRIVATE_SLOT(d_func(), void sourceDataChanged(const QModelIndex &, const QModelIndex &))
+
+    //@endcond
+};
+
+#endif

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/lessthanwidget.cpp

@@ -0,0 +1,106 @@
+/*
+    This file is part of the proxy model test suite.
+
+    SPDX-FileCopyrightText: 2009 Stephen Kelly <steveire@gmail.com>
+
+    SPDX-License-Identifier: LGPL-2.1-or-later
+*/
+
+#include "lessthanwidget.h"
+
+#include <QLabel>
+#include <QTreeView>
+#include <QVBoxLayout>
+
+ColoredTreeModel::ColoredTreeModel(QObject *parent)
+    : DynamicTreeModel(parent)
+    , m_selectionModel(nullptr)
+    , m_lessThanColour(Qt::yellow)
+    , m_greaterThanColour(Qt::red)
+{
+}
+
+void ColoredTreeModel::setSelectionModel(QItemSelectionModel *selectionModel)
+{
+    m_selectionModel = selectionModel;
+    connect(selectionModel, SIGNAL(selectionChanged(QItemSelection, QItemSelection)), SLOT(recolor()));
+}
+
+void ColoredTreeModel::recolor(const QModelIndex &parent)
+{
+    const QModelIndex topLeft = index(0, 0, parent);
+    const int _rowCount = rowCount(parent);
+    const QModelIndex bottomRight = index(_rowCount - 1, columnCount(parent) - 1, parent);
+    Q_EMIT dataChanged(topLeft, bottomRight);
+
+    static const int column = 0;
+    QModelIndex idx;
+    for (int row = 0; row < _rowCount; ++row) {
+        idx = index(row, column, parent);
+        if (hasChildren(idx)) {
+            recolor(idx);
+        }
+    }
+}
+
+QVariant ColoredTreeModel::data(const QModelIndex &index, int role) const
+{
+    if (role != Qt::BackgroundRole || !m_selectionModel || m_selectionModel->selection().indexes().size() != 1) {
+        return DynamicTreeModel::data(index, role);
+    }
+
+    const QModelIndex selectedIndex = m_selectionModel->selection().indexes().first();
+
+    if (index == selectedIndex) {
+        return DynamicTreeModel::data(index, role);
+    }
+
+    if (index < selectedIndex) {
+        return m_lessThanColour;
+    }
+
+    Q_ASSERT(selectedIndex < index);
+
+    return m_greaterThanColour;
+}
+
+void LessThanWidget::insertGrid(QList<int> address)
+{
+    ModelInsertCommand *ins = new ModelInsertCommand(m_coloredTreeModel, this);
+    ins->setAncestorRowNumbers(address);
+    ins->setNumCols(5);
+    ins->setStartRow(0);
+    ins->setEndRow(5);
+    ins->doCommand();
+}
+
+LessThanWidget::LessThanWidget(QWidget *parent, Qt::WindowFlags f)
+    : QWidget(parent, f)
+{
+    QLabel *explanation = new QLabel(this);
+    explanation->setText(
+        QLatin1String("The yellow items are 'less than' the selected item according to QModelIndex::operator<().\n"
+                      "The red items are greater than the selected item (i.e, not less than and not equal)."));
+
+    m_coloredTreeModel = new ColoredTreeModel(this);
+    QTreeView *treeView = new QTreeView(this);
+    treeView->setModel(m_coloredTreeModel);
+    treeView->setSelectionBehavior(QAbstractItemView::SelectItems);
+    treeView->setSelectionMode(QTreeView::SingleSelection);
+
+    m_coloredTreeModel->setSelectionModel(treeView->selectionModel());
+
+    QVBoxLayout *layout = new QVBoxLayout(this);
+    layout->addWidget(explanation);
+    layout->addWidget(treeView);
+
+    insertGrid(QList<int>());
+    insertGrid(QList<int>() << 2);
+    insertGrid(QList<int>() << 3);
+    insertGrid(QList<int>() << 4);
+    insertGrid(QList<int>() << 3 << 2);
+    insertGrid(QList<int>() << 3 << 3);
+    insertGrid(QList<int>() << 3 << 4);
+}
+
+#include "moc_lessthanwidget.cpp"

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/lessthanwidget.h

@@ -0,0 +1,48 @@
+/*
+    This file is part of the proxy model test suite.
+
+    SPDX-FileCopyrightText: 2009 Stephen Kelly <steveire@gmail.com>
+
+    SPDX-License-Identifier: LGPL-2.1-or-later
+*/
+
+#ifndef LESSTHANWIDGET_H
+#define LESSTHANWIDGET_H
+
+#include <QItemSelectionModel>
+#include <QWidget>
+
+#include "dynamictreemodel.h"
+
+class ColoredTreeModel : public DynamicTreeModel
+{
+    Q_OBJECT
+public:
+    ColoredTreeModel(QObject *parent = nullptr);
+
+    QVariant data(const QModelIndex &index, int role = Qt::DisplayRole) const override;
+
+    void setSelectionModel(QItemSelectionModel *selectionModel);
+
+protected Q_SLOTS:
+    void recolor(const QModelIndex &parent = QModelIndex());
+
+private:
+    QItemSelectionModel *m_selectionModel;
+    QColor m_lessThanColour;
+    QColor m_greaterThanColour;
+};
+
+class LessThanWidget : public QWidget
+{
+    Q_OBJECT
+public:
+    LessThanWidget(QWidget *parent = nullptr, Qt::WindowFlags f = Qt::WindowFlags());
+
+    void insertGrid(QList<int> address);
+
+private:
+    ColoredTreeModel *m_coloredTreeModel;
+};
+
+#endif

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/main.cpp

@@ -0,0 +1,17 @@
+/*
+    SPDX-FileCopyrightText: 2009 Stephen Kelly <steveire@gmail.com>
+
+    SPDX-License-Identifier: LGPL-2.1-or-later
+*/
+
+#include "mainwindow.h"
+
+#include <QApplication>
+
+int main(int argc, char **argv)
+{
+    QApplication app(argc, argv);
+    MainWindow *mw = new MainWindow();
+    mw->show();
+    return app.exec();
+}

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/mainwindow.cpp

@@ -0,0 +1,69 @@
+/*
+    This file is part of the proxy model test suite.
+
+    SPDX-FileCopyrightText: 2009 Stephen Kelly <steveire@gmail.com>
+
+    SPDX-License-Identifier: LGPL-2.1-or-later
+*/
+
+#include "mainwindow.h"
+
+#include <QTabWidget>
+
+#include "dynamictreemodel.h"
+
+#include "breadcrumbdirectionwidget.h"
+#include "breadcrumbnavigationwidget.h"
+#include "breadcrumbswidget.h"
+#include "checkablewidget.h"
+#include "descendantpmwidget.h"
+#include "selectionpmwidget.h"
+// #include "statesaverwidget.h"
+#include "descendantqmltree.h"
+#include "proxyitemselectionwidget.h"
+#include "proxymodeltestwidget.h"
+#ifdef QT_QML_LIB
+#include "reparentingpmwidget.h"
+#endif
+#include "kidentityproxymodelwidget.h"
+#include "lessthanwidget.h"
+#include "matchcheckingwidget.h"
+#ifdef QT_QUICKWIDGETS_LIB
+#include "selectioninqmlwidget.h"
+#endif
+
+MainWindow::MainWindow()
+    : QMainWindow()
+{
+    QTabWidget *tabWidget = new QTabWidget(this);
+
+    tabWidget->addTab(new MatchCheckingWidget(), QStringLiteral("Match Checking PM"));
+    tabWidget->addTab(new DescendantProxyModelWidget(), QStringLiteral("descendant PM"));
+    tabWidget->addTab(new SelectionProxyWidget(), QStringLiteral("selection PM"));
+#ifdef QT_QUICKWIDGETS_LIB
+    tabWidget->addTab(new SelectionInQmlWidget(), QStringLiteral("selection PM in QML"));
+#endif
+    tabWidget->addTab(new KIdentityProxyModelWidget(), QStringLiteral("Identity PM"));
+    tabWidget->addTab(new CheckableWidget(), QStringLiteral("Checkable"));
+    tabWidget->addTab(new BreadcrumbsWidget(), QStringLiteral("Breadcrumbs"));
+    tabWidget->addTab(new BreadcrumbNavigationWidget(), QStringLiteral("Breadcrumb Navigation"));
+    tabWidget->addTab(new BreadcrumbDirectionWidget(), QStringLiteral("Breadcrumb Direction"));
+    tabWidget->addTab(new ProxyItemSelectionWidget(), QStringLiteral("Proxy Item selection"));
+#ifdef QT_QML_LIB
+    tabWidget->addTab(new ReparentingProxyModelWidget(), QStringLiteral("reparenting PM"));
+#endif
+#ifdef QT_QUICKWIDGETS_LIB
+    tabWidget->addTab(new DescendantQmlTreeWidget(), QStringLiteral("QML Trees"));
+#endif
+    tabWidget->addTab(new LessThanWidget(), QStringLiteral("Less Than"));
+    tabWidget->addTab(new ProxyModelTestWidget(), QStringLiteral("Proxy Model Test"));
+    //   tabWidget->addTab(new StateSaverWidget(), "State Saver Test");
+
+    setCentralWidget(tabWidget);
+}
+
+MainWindow::~MainWindow()
+{
+}
+
+#include "moc_mainwindow.cpp"

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/mainwindow.h

@@ -0,0 +1,36 @@
+/*
+    This file is part of the proxy model test suite.
+
+    SPDX-FileCopyrightText: 2009 Stephen Kelly <steveire@gmail.com>
+
+    SPDX-License-Identifier: LGPL-2.1-or-later
+*/
+
+#ifndef TESTAPPLICATION_H
+#define TESTAPPLICATION_H
+
+#include <QMainWindow>
+
+class DynamicTreeModel;
+
+//@cond PRIVATE
+
+/**
+ * @internal
+ * Test Application for proxy models.
+ */
+class MainWindow : public QMainWindow
+{
+    Q_OBJECT
+public:
+    MainWindow();
+    ~MainWindow() override;
+
+private:
+    DynamicTreeModel *m_rootModel;
+    //   ContactsWidget* cw;
+};
+
+//@endcond
+
+#endif

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/matchcheckingwidget.cpp

@@ -0,0 +1,80 @@
+/*
+    SPDX-FileCopyrightText: 2010 Stephen Kelly <steveire@gmail.com>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+
+#include "matchcheckingwidget.h"
+
+#include <QLineEdit>
+#include <QRadioButton>
+#include <QSplitter>
+#include <QTreeView>
+#include <QVBoxLayout>
+
+#include "dynamictreemodel.h"
+#include "dynamictreewidget.h"
+#include <kselectionproxymodel.h>
+
+#include <QDebug>
+
+MatchCheckingWidget::MatchCheckingWidget(QWidget *parent, Qt::WindowFlags f)
+    : QWidget(parent, f)
+{
+    QVBoxLayout *layout = new QVBoxLayout(this);
+
+    m_lineEdit = new QLineEdit();
+
+    connect(m_lineEdit, SIGNAL(textChanged(QString)), SLOT(matchChanged(QString)));
+
+    m_dynamicTreeRadioButton = new QRadioButton(QStringLiteral("Dynamic Tree Model"), this);
+    m_selectionModelRadioButton = new QRadioButton(QStringLiteral("Selection Model"), this);
+
+    layout->addWidget(m_lineEdit);
+    layout->addWidget(m_dynamicTreeRadioButton);
+    layout->addWidget(m_selectionModelRadioButton);
+
+    QSplitter *splitter = new QSplitter(this);
+    layout->addWidget(splitter);
+    DynamicTreeModel *dynamicTreeModel = new DynamicTreeModel(this);
+
+    m_dynamicTreeWidget = new DynamicTreeWidget(dynamicTreeModel, this);
+
+    splitter->addWidget(m_dynamicTreeWidget);
+
+    KSelectionProxyModel *selectionProxyModel = new KSelectionProxyModel(m_dynamicTreeWidget->treeView()->selectionModel(), this);
+    selectionProxyModel->setSourceModel(dynamicTreeModel);
+
+    m_selectionTreeView = new QTreeView(this);
+    m_selectionTreeView->setModel(selectionProxyModel);
+    splitter->addWidget(m_selectionTreeView);
+}
+
+void MatchCheckingWidget::matchChanged(const QString &matchData)
+{
+    bool ok;
+    int id = matchData.toInt(&ok);
+    qDebug() << matchData << id << DynamicTreeModel::DynamicTreeModelId;
+    if (!ok) {
+        return;
+    }
+
+    QModelIndexList list;
+    if (m_dynamicTreeRadioButton->isChecked()) {
+        m_dynamicTreeWidget->treeView()->selectionModel()->clearSelection();
+        list = m_dynamicTreeWidget->model()->match(m_dynamicTreeWidget->model()->index(0, 0), DynamicTreeModel::DynamicTreeModelId, id);
+        qDebug() << list;
+        for (const QModelIndex &idx : std::as_const(list)) {
+            m_dynamicTreeWidget->treeView()->selectionModel()->select(idx, QItemSelectionModel::SelectCurrent);
+        }
+    } else if (m_selectionModelRadioButton->isChecked()) {
+        m_selectionTreeView->selectionModel()->clearSelection();
+        list = m_selectionTreeView->model()->match(m_selectionTreeView->model()->index(0, 0), DynamicTreeModel::DynamicTreeModelId, id);
+        qDebug() << list;
+        for (const QModelIndex &idx : std::as_const(list)) {
+            m_selectionTreeView->selectionModel()->select(idx, QItemSelectionModel::SelectCurrent);
+        }
+    }
+}
+
+#include "moc_matchcheckingwidget.cpp"

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/matchcheckingwidget.h

@@ -0,0 +1,35 @@
+/*
+    SPDX-FileCopyrightText: 2010 Stephen Kelly <steveire@gmail.com>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+
+#ifndef MATCHCHECKINGWIDGET_H343434
+#define MATCHCHECKINGWIDGET_H343434
+
+#include <QWidget>
+
+class QTreeView;
+class QLineEdit;
+class QRadioButton;
+
+class DynamicTreeWidget;
+
+class MatchCheckingWidget : public QWidget
+{
+    Q_OBJECT
+public:
+    MatchCheckingWidget(QWidget *parent = nullptr, Qt::WindowFlags f = Qt::WindowFlags());
+
+private Q_SLOTS:
+    void matchChanged(const QString &matchData);
+
+private:
+    QLineEdit *m_lineEdit;
+    DynamicTreeWidget *m_dynamicTreeWidget;
+    QTreeView *m_selectionTreeView;
+    QRadioButton *m_dynamicTreeRadioButton;
+    QRadioButton *m_selectionModelRadioButton;
+};
+
+#endif

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/modelcommanderwidget.cpp

@@ -0,0 +1,105 @@
+/*
+    SPDX-FileCopyrightText: 2010 Stephen Kelly <steveire@gmail.com>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+
+#include "modelcommanderwidget.h"
+
+#include <QPushButton>
+#include <QTreeWidget>
+#include <QVBoxLayout>
+
+#include "dynamictreemodel.h"
+#include "modelcommander.h"
+#include <QMetaMethod>
+
+ModelCommanderWidget::ModelCommanderWidget(DynamicTreeModel *dynamicTreeModel, QWidget *parent, Qt::WindowFlags f)
+    : QWidget(parent, f)
+    , m_dynamicTreeModel(dynamicTreeModel)
+    , m_modelCommander(new ModelCommander(m_dynamicTreeModel, this))
+    , m_treeWidget(new QTreeWidget)
+    , m_executeButton(new QPushButton(QStringLiteral("Execute")))
+{
+    QVBoxLayout *layout = new QVBoxLayout(this);
+    layout->addWidget(m_treeWidget);
+    layout->addWidget(m_executeButton);
+
+    init();
+
+    connect(m_treeWidget, &QTreeWidget::currentItemChanged, this, &ModelCommanderWidget::currentItemChanged);
+
+    connect(m_executeButton, &QPushButton::clicked, this, &ModelCommanderWidget::executeCurrentTest);
+}
+
+void ModelCommanderWidget::init()
+{
+    const QMetaObject *mo = m_modelCommander->metaObject();
+    QMetaMethod mm;
+    for (int i = 0; i < mo->methodCount(); ++i) {
+        mm = mo->method(i);
+        QString signature = mm.methodSignature();
+        if (signature.startsWith(QLatin1String("init_")) && signature.endsWith(QLatin1String("(QString)"))) {
+            QTreeWidgetItem *testFunctionItem = new QTreeWidgetItem(m_treeWidget, QStringList() << signature.mid(5, signature.length() - 14));
+            m_treeWidget->addTopLevelItem(testFunctionItem);
+
+            QStringList testData;
+            QMetaObject::invokeMethod(m_modelCommander,
+                                      QByteArray("execute_" + testFunctionItem->text(0).toLatin1()).constData(),
+                                      Q_RETURN_ARG(QStringList, testData),
+                                      Q_ARG(QString, QString()));
+
+            for (const QString &testRun : std::as_const(testData)) {
+                new QTreeWidgetItem(testFunctionItem, QStringList() << testRun);
+            }
+        }
+    }
+}
+
+void ModelCommanderWidget::currentItemChanged(QTreeWidgetItem *current, QTreeWidgetItem *previous)
+{
+    Q_UNUSED(previous);
+    initTest(current);
+}
+
+void ModelCommanderWidget::executeCurrentTest()
+{
+    executeTest(m_treeWidget->currentItem());
+
+    disconnect(m_executeButton, &QPushButton::clicked, this, &ModelCommanderWidget::executeCurrentTest);
+    m_executeButton->setText(QStringLiteral("Reset"));
+    connect(m_executeButton, &QPushButton::clicked, this, &ModelCommanderWidget::resetCurrentTest);
+}
+
+void ModelCommanderWidget::resetCurrentTest()
+{
+    initTest(m_treeWidget->currentItem());
+
+    disconnect(m_executeButton, &QPushButton::clicked, this, &ModelCommanderWidget::resetCurrentTest);
+    m_executeButton->setText(QStringLiteral("Execute"));
+    connect(m_executeButton, &QPushButton::clicked, this, &ModelCommanderWidget::executeCurrentTest);
+}
+
+void ModelCommanderWidget::initTest(QTreeWidgetItem *item)
+{
+    if (!item->parent()) {
+        return; // m_dynamicTreeModel->clear();
+    }
+    m_dynamicTreeModel->clear();
+    bool success =
+        QMetaObject::invokeMethod(m_modelCommander, QByteArray("init_" + item->parent()->text(0).toLatin1()).constData(), Q_ARG(QString, item->text(0)));
+    Q_ASSERT(success);
+}
+
+void ModelCommanderWidget::executeTest(QTreeWidgetItem *item)
+{
+    if (!item->parent()) {
+        return;
+    }
+
+    bool success =
+        QMetaObject::invokeMethod(m_modelCommander, QByteArray("execute_" + item->parent()->text(0).toLatin1()).constData(), Q_ARG(QString, item->text(0)));
+    Q_ASSERT(success);
+}
+
+#include "moc_modelcommanderwidget.cpp"

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/modelcommanderwidget.h

@@ -0,0 +1,42 @@
+/*
+    SPDX-FileCopyrightText: 2010 Stephen Kelly <steveire@gmail.com>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+
+#ifndef MODELCOMMANDERWIDGET_H
+#define MODELCOMMANDERWIDGET_H
+
+#include <QWidget>
+
+class QTreeWidget;
+class QTreeWidgetItem;
+class QPushButton;
+
+class DynamicTreeModel;
+class ModelCommander;
+
+class ModelCommanderWidget : public QWidget
+{
+    Q_OBJECT
+public:
+    ModelCommanderWidget(DynamicTreeModel *dynamicTreeModel, QWidget *parent = nullptr, Qt::WindowFlags f = Qt::WindowFlags());
+
+private Q_SLOTS:
+    void initTest(QTreeWidgetItem *item);
+    void executeTest(QTreeWidgetItem *item);
+    void currentItemChanged(QTreeWidgetItem *current, QTreeWidgetItem *previous);
+    void executeCurrentTest();
+    void resetCurrentTest();
+
+private:
+    void init();
+
+private:
+    DynamicTreeModel *m_dynamicTreeModel;
+    ModelCommander *m_modelCommander;
+    QTreeWidget *m_treeWidget;
+    QPushButton *m_executeButton;
+};
+
+#endif

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/proxyitemselectionwidget.cpp

@@ -0,0 +1,90 @@
+/*
+    SPDX-FileCopyrightText: 2010 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.net>
+    SPDX-FileContributor: Stephen Kelly <stephen@kdab.com>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+
+#include "proxyitemselectionwidget.h"
+
+#include <QHBoxLayout>
+#include <QSortFilterProxyModel>
+#include <QSplitter>
+#include <QTreeView>
+
+#include "dynamictreemodel.h"
+#include "dynamictreewidget.h"
+#include "klinkitemselectionmodel.h"
+
+#define SON(object) object->setObjectName(QStringLiteral(#object))
+
+ProxyItemSelectionWidget::ProxyItemSelectionWidget(QWidget *parent, Qt::WindowFlags f)
+    : QWidget(parent, f)
+{
+    QSplitter *splitter = new QSplitter(this);
+    QHBoxLayout *layout = new QHBoxLayout(this);
+    layout->addWidget(splitter);
+
+    DynamicTreeModel *rootModel = new DynamicTreeModel(this);
+
+    DynamicTreeWidget *dynamicTreeWidget = new DynamicTreeWidget(rootModel, splitter);
+
+    dynamicTreeWidget->setInitialTree(
+        QLatin1String("- 1"
+                      "- 2"
+                      "- - 3"
+                      "- - - 4"
+                      "- 5"
+                      "- 6"
+                      "- 7"));
+
+    QSplitter *vSplitter = new QSplitter(Qt::Vertical, splitter);
+    QSplitter *hSplitter1 = new QSplitter(vSplitter);
+    QSplitter *hSplitter2 = new QSplitter(vSplitter);
+
+    QSortFilterProxyModel *proxy1 = new QSortFilterProxyModel(this);
+    SON(proxy1);
+    QSortFilterProxyModel *proxy2 = new QSortFilterProxyModel(this);
+    SON(proxy2);
+    QSortFilterProxyModel *proxy3 = new QSortFilterProxyModel(this);
+    SON(proxy3);
+    QSortFilterProxyModel *proxy4 = new QSortFilterProxyModel(this);
+    SON(proxy4);
+    QSortFilterProxyModel *proxy5 = new QSortFilterProxyModel(this);
+    SON(proxy5);
+
+    QTreeView *view1 = new QTreeView(hSplitter1);
+    QTreeView *view2 = new QTreeView(hSplitter1);
+    QTreeView *view3 = new QTreeView(hSplitter2);
+    QTreeView *view4 = new QTreeView(hSplitter2);
+
+    proxy1->setSourceModel(rootModel);
+    proxy2->setSourceModel(proxy1);
+    proxy3->setSourceModel(proxy2);
+
+    proxy4->setSourceModel(rootModel);
+    proxy5->setSourceModel(proxy4);
+
+    view1->setModel(proxy3);
+    view2->setModel(proxy5);
+    view3->setModel(proxy2);
+    view4->setModel(proxy1);
+
+    QItemSelectionModel *rootSelectionModel = dynamicTreeWidget->treeView()->selectionModel();
+
+    KLinkItemSelectionModel *view1SelectionModel = new KLinkItemSelectionModel(view1->model(), rootSelectionModel, this);
+    view1->setSelectionModel(view1SelectionModel);
+
+    KLinkItemSelectionModel *view2SelectionModel = new KLinkItemSelectionModel(view2->model(), view1->selectionModel(), this);
+    view2->setSelectionModel(view2SelectionModel);
+
+    KLinkItemSelectionModel *view3SelectionModel = new KLinkItemSelectionModel(view3->model(), view4->selectionModel(), this);
+    view3->setSelectionModel(view3SelectionModel);
+
+    view1->expandAll();
+    view2->expandAll();
+    view3->expandAll();
+    view4->expandAll();
+}
+
+#include "moc_proxyitemselectionwidget.cpp"

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/proxyitemselectionwidget.h

@@ -0,0 +1,20 @@
+/*
+    SPDX-FileCopyrightText: 2010 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.net>
+    SPDX-FileContributor: Stephen Kelly <stephen@kdab.com>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+
+#ifndef PROXYITEMSELECTIONWIDGET_H
+#define PROXYITEMSELECTIONWIDGET_H
+
+#include <QWidget>
+
+class ProxyItemSelectionWidget : public QWidget
+{
+    Q_OBJECT
+public:
+    ProxyItemSelectionWidget(QWidget *parent = nullptr, Qt::WindowFlags f = Qt::WindowFlags());
+};
+
+#endif

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/proxymodeltestwidget.cpp

@@ -0,0 +1,57 @@
+/*
+    This file is part of the proxy model test suite.
+
+    SPDX-FileCopyrightText: 2009 Stephen Kelly <steveire@gmail.com>
+
+    SPDX-License-Identifier: LGPL-2.1-or-later
+*/
+
+#include "proxymodeltestwidget.h"
+
+#include <QPushButton>
+#include <QSplitter>
+#include <QTreeView>
+#include <QVBoxLayout>
+
+#include "dynamictreemodel.h"
+#include "kselectionproxymodel.h"
+#include "modelcommander.h"
+#if 0
+#include "kdescendantsproxymodel.h"
+#endif
+#include "modelcommanderwidget.h"
+
+ProxyModelTestWidget::ProxyModelTestWidget(QWidget *parent, Qt::WindowFlags f)
+    : QWidget(parent, f)
+{
+    QVBoxLayout *layout = new QVBoxLayout(this);
+    QSplitter *splitter = new QSplitter(this);
+
+    m_rootModel = new DynamicTreeModel(this);
+
+    (void)new ModelCommanderWidget(m_rootModel, splitter);
+
+    QTreeView *rootModelView = new QTreeView(splitter);
+    rootModelView->setModel(m_rootModel);
+    rootModelView->setSelectionMode(QTreeView::ExtendedSelection);
+
+    KSelectionProxyModel *selProxyModel = new KSelectionProxyModel(rootModelView->selectionModel(), this);
+    selProxyModel->setSourceModel(m_rootModel);
+    selProxyModel->setFilterBehavior(KSelectionProxyModel::ChildrenOfExactSelection);
+
+    QTreeView *selModelView = new QTreeView(splitter);
+    selModelView->setModel(selProxyModel);
+
+#if 0
+    KDescendantsProxyModel *descProxyModel = new KDescendantsProxyModel(this);
+    descProxyModel->setSourceModel(m_rootModel);
+    QTreeView *descProxyModelView = new QTreeView(splitter);
+    descProxyModelView ->setModel(descProxyModel);
+#endif
+
+    // Your Proxy Here?
+
+    layout->addWidget(splitter);
+}
+
+#include "moc_proxymodeltestwidget.cpp"

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/proxymodeltestwidget.h

@@ -0,0 +1,28 @@
+/*
+    This file is part of the proxy model test suite.
+
+    SPDX-FileCopyrightText: 2009 Stephen Kelly <steveire@gmail.com>
+
+    SPDX-License-Identifier: LGPL-2.1-or-later
+*/
+
+#ifndef PROXYMODELTESTWIDGET_H
+#define PROXYMODELTESTWIDGET_H
+
+#include <QWidget>
+
+class DynamicTreeModel;
+class ModelCommander;
+class QPushButton;
+
+class ProxyModelTestWidget : public QWidget
+{
+    Q_OBJECT
+public:
+    explicit ProxyModelTestWidget(QWidget *parent = nullptr, Qt::WindowFlags f = Qt::WindowFlags());
+
+private:
+    DynamicTreeModel *m_rootModel;
+};
+
+#endif

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/reparentingpmwidget.cpp

@@ -0,0 +1,42 @@
+/*
+    This file is part of the proxy model test suite.
+
+    SPDX-FileCopyrightText: 2009 Stephen Kelly <steveire@gmail.com>
+
+    SPDX-License-Identifier: LGPL-2.1-or-later
+*/
+
+#include "reparentingpmwidget.h"
+
+#include <QSplitter>
+#include <QTreeView>
+#include <QVBoxLayout>
+
+#include "dynamictreemodel.h"
+#include "dynamictreewidget.h"
+#include "scriptablereparentingwidget.h"
+
+ReparentingProxyModelWidget::ReparentingProxyModelWidget(QWidget *parent)
+    : QWidget(parent)
+{
+    QVBoxLayout *layout = new QVBoxLayout(this);
+
+    QSplitter *vSplitter = new QSplitter(this);
+    layout->addWidget(vSplitter);
+
+    m_rootModel = new DynamicTreeModel(this);
+
+    DynamicTreeWidget *dynamicTreeWidget = new DynamicTreeWidget(m_rootModel, vSplitter);
+    dynamicTreeWidget->setInitialTree(
+        QLatin1String("- 1"
+                      "- 2"
+                      "- - 3"
+                      "- - - 4"
+                      "- 5"
+                      "- 6"
+                      "- 7"));
+
+    new ScriptableReparentingWidget(m_rootModel, vSplitter);
+}
+
+#include "moc_reparentingpmwidget.cpp"

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/reparentingpmwidget.h

@@ -0,0 +1,28 @@
+/*
+    This file is part of the proxy model test suite.
+
+    SPDX-FileCopyrightText: 2009 Stephen Kelly <steveire@gmail.com>
+
+    SPDX-License-Identifier: LGPL-2.1-or-later
+*/
+
+#ifndef REPARENTINGPM_WIDGET_H
+#define REPARENTINGPM_WIDGET_H
+
+#include <QWidget>
+
+#include "kreparentingproxymodel.h"
+
+class DynamicTreeModel;
+
+class ReparentingProxyModelWidget : public QWidget
+{
+    Q_OBJECT
+public:
+    ReparentingProxyModelWidget(QWidget *parent = nullptr);
+
+private:
+    DynamicTreeModel *m_rootModel;
+};
+
+#endif

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/scriptablereparentingwidget.cpp

@@ -0,0 +1,120 @@
+/*
+    SPDX-FileCopyrightText: 2009 Stephen Kelly <steveire@gmail.com>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+
+#include "scriptablereparentingwidget.h"
+
+#include <QJSEngine>
+#include <QPlainTextEdit>
+#include <QTreeView>
+#include <QVBoxLayout>
+
+#include <QComboBox>
+#include <QLabel>
+#include <QSplitter>
+
+static const char *const threadingFunctionNames[] = {"None", "Flat List", "Straight Line Tree", "Dragon Teeth 1", "Dragon Teeth 2", "Specified parents 1"};
+
+static const char *const threadingFunctionBodies[] = {"",
+                                                      "return false;",
+                                                      "return true;",
+                                                      "if (descendant % 3 ==1)\n"
+                                                      "    return false;\n"
+                                                      "return true;",
+                                                      "if (descendant % 4 ==1)\n"
+                                                      "    return false;\n"
+                                                      "return true;",
+                                                      "var threaddata = [[1, 2, 3, 4],\n"
+                                                      "                  [13, 14, 15],\n"
+                                                      "                  [13, 16, 17],\n"
+                                                      "                  [5, 6]];\n"
+                                                      "\n"
+                                                      "for (var i = 0; i < threaddata.length; ++i)\n"
+                                                      "{\n"
+                                                      "  var a = threaddata[i].indexOf(ancestor);\n"
+                                                      "  var d = threaddata[i].indexOf(descendant);\n"
+                                                      "  if (a >= 0 && d >= 0)\n"
+                                                      "    return a < d;\n"
+                                                      "}\n"
+                                                      "return false;"};
+
+ScriptableReparentingProxyModel::ScriptableReparentingProxyModel(QObject *parent)
+    : KReparentingProxyModel(parent)
+    , m_scriptEngine(new QJSEngine(this))
+{
+}
+
+bool ScriptableReparentingProxyModel::isDescendantOf(const QModelIndex &ancestor, const QModelIndex &descendant) const
+{
+    if (!m_implementationFunction.isCallable()) {
+        return KReparentingProxyModel::isDescendantOf(ancestor, descendant);
+    }
+
+    QJSValue returnValue = m_implementationFunction.call({ancestor.data().toInt(), descendant.data().toInt()});
+
+    if (!returnValue.isBool()) {
+        return KReparentingProxyModel::isDescendantOf(ancestor, descendant);
+    }
+
+    return returnValue.toBool();
+}
+
+void ScriptableReparentingProxyModel::setImplementation(const QString &implementation)
+{
+    beginChangeRule();
+    m_implementationFunction = m_scriptEngine->evaluate(implementation);
+    m_implementationFunction = m_scriptEngine->globalObject().property(QStringLiteral("isDescendantOf"));
+    endChangeRule();
+}
+
+ScriptableReparentingWidget::ScriptableReparentingWidget(QAbstractItemModel *rootModel, QWidget *parent, Qt::WindowFlags f)
+    : QWidget(parent, f)
+    , m_reparentingProxyModel(new ScriptableReparentingProxyModel(this))
+{
+    QVBoxLayout *mainLayout = new QVBoxLayout(this);
+    QSplitter *splitter = new QSplitter(Qt::Vertical, this);
+    mainLayout->addWidget(splitter);
+
+    m_treeView = new QTreeView(splitter);
+    QWidget *container = new QWidget(splitter);
+    QVBoxLayout *layout = new QVBoxLayout(container);
+    m_textEdit = new QPlainTextEdit(container);
+    m_textEdit->setFont(QFont(QStringLiteral("monospace")));
+
+    m_comboBox = new QComboBox(container);
+    for (int i = 0; i < int(sizeof threadingFunctionNames / sizeof *threadingFunctionNames); ++i) {
+        m_comboBox->addItem(*(threadingFunctionNames + i), *(threadingFunctionBodies + i));
+    }
+    layout->addWidget(m_comboBox);
+    connect(m_comboBox, SIGNAL(currentIndexChanged(int)), SLOT(setExampleFunction(int)));
+
+    layout->addWidget(new QLabel(QStringLiteral("function isDescendantOf (ancestor, descendant) {"), container));
+    QHBoxLayout *indentedLayout = new QHBoxLayout;
+    indentedLayout->addSpacing(30);
+    indentedLayout->addWidget(m_textEdit);
+    layout->addLayout(indentedLayout);
+    layout->addWidget(new QLabel(QStringLiteral("}"), container));
+
+    m_reparentingProxyModel->setSourceModel(rootModel);
+    m_treeView->setModel(m_reparentingProxyModel);
+
+    splitter->setStretchFactor(0, 100);
+
+    connect(m_textEdit, SIGNAL(textChanged()), SLOT(textChanged()));
+    textChanged();
+}
+
+void ScriptableReparentingWidget::setExampleFunction(int index)
+{
+    m_textEdit->setPlainText(m_comboBox->itemData(index).toString());
+}
+
+void ScriptableReparentingWidget::textChanged()
+{
+    m_reparentingProxyModel->setImplementation("function isDescendantOf (ancestor, descendant) { " + m_textEdit->toPlainText() + " }");
+    m_treeView->expandAll();
+}
+
+#include "moc_scriptablereparentingwidget.cpp"

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/scriptablereparentingwidget.h

@@ -0,0 +1,52 @@
+/*
+    SPDX-FileCopyrightText: 2009 Stephen Kelly <steveire@gmail.com>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+
+#ifndef SCRIPTABLEREPARENTINGWIDGET_H
+#define SCRIPTABLEREPARENTINGWIDGET_H
+
+#include <QJSValue>
+#include <QWidget>
+
+#include "kreparentingproxymodel.h"
+
+class QComboBox;
+class QTreeView;
+class QPlainTextEdit;
+class QJSEngine;
+
+class ScriptableReparentingProxyModel : public KReparentingProxyModel
+{
+    Q_OBJECT
+public:
+    ScriptableReparentingProxyModel(QObject *parent = nullptr);
+
+    bool isDescendantOf(const QModelIndex &ancestor, const QModelIndex &descendant) const override;
+
+    void setImplementation(const QString &implementation);
+
+private:
+    QJSEngine *m_scriptEngine;
+    mutable QJSValue m_implementationFunction;
+};
+
+class ScriptableReparentingWidget : public QWidget
+{
+    Q_OBJECT
+public:
+    ScriptableReparentingWidget(QAbstractItemModel *rootModel, QWidget *parent = nullptr, Qt::WindowFlags f = Qt::WindowFlags());
+
+private Q_SLOTS:
+    void textChanged();
+    void setExampleFunction(int index);
+
+private:
+    QComboBox *m_comboBox;
+    ScriptableReparentingProxyModel *m_reparentingProxyModel;
+    QTreeView *m_treeView;
+    QPlainTextEdit *m_textEdit;
+};
+
+#endif // SCRIPTABLEREPARENTINGWIDGET_H

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/selection.qml

@@ -0,0 +1,125 @@
+/*
+    SPDX-FileCopyrightText: 2015 Stephen Kelly <steveire@gmail.com>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+
+import QtQuick 2.4
+
+import KF5ItemModels 1.0
+
+Item {
+  width: 600
+  height: 500
+
+  Component {
+    id: labelledSelectionView
+
+    Column {
+      id: column
+      width : 200
+      property var filterBehavior
+      property var filterBehaviorName
+      Text {
+        id: label
+        width: parent.width
+        horizontalAlignment: Text.AlignHCenter
+        font.bold: true
+        font.pointSize: 10
+        text: column.filterBehaviorName
+      }
+      SelectionProxyModel {
+        id: selection
+        sourceModel: _model
+        selectionModel: _selectionModel
+        filterBehavior: column.filterBehavior
+      }
+      Rectangle {
+        height: parent.height - label.height
+        width: parent.width
+        border.width : 1
+        border.color: "black"
+        radius: 5
+        ListView {
+          width: parent.width
+          height: parent.height
+          y: 5
+          x: 5
+          model: selection
+          delegate: Rectangle {
+            x: 1
+            y: 1
+            height: 30
+            width: 100
+            color: model.index % 2 == 0 ? "lightsteelblue" : "white"
+            Text {
+              x: 5
+              y: 5
+              text: model.display
+            }
+          }
+        }
+      }
+    }
+  }
+
+  Loader {
+    id: loaderExactSelection
+    width : 200
+    height: 300
+    sourceComponent: labelledSelectionView
+    Binding {
+      target: loaderExactSelection.item
+      property: "filterBehavior"
+      value: SelectionProxyModel.ExactSelection
+      when: loaderExactSelection.status == Loader.Ready
+    }
+    Binding {
+      target: loaderExactSelection.item
+      property: "filterBehaviorName"
+      value: "ExactSelection"
+      when: loaderExactSelection.status == Loader.Ready
+    }
+  }
+
+  Loader {
+    id: loaderChildrenOfExactSelection
+    x: 200
+    width : 200
+    height: 300
+    sourceComponent: labelledSelectionView
+    Binding {
+      target: loaderChildrenOfExactSelection.item
+      property: "filterBehavior"
+      value: SelectionProxyModel.ChildrenOfExactSelection
+      when: loaderChildrenOfExactSelection.status == Loader.Ready
+    }
+    Binding {
+      target: loaderChildrenOfExactSelection.item
+      property: "filterBehaviorName"
+      value: "ChildrenOfExactSelection"
+      when: loaderChildrenOfExactSelection.status == Loader.Ready
+    }
+  }
+
+  Loader {
+    id: loaderSubTreeRoots
+    x: 400
+    width : 200
+    height: 300
+    sourceComponent: labelledSelectionView
+    Binding {
+      target: loaderSubTreeRoots.item
+      property: "filterBehavior"
+      value: SelectionProxyModel.SubTreeRoots
+      when: loaderSubTreeRoots.status == Loader.Ready
+    }
+    Binding {
+      target: loaderSubTreeRoots.item
+      property: "filterBehaviorName"
+      value: "SubTreeRoots"
+      when: loaderSubTreeRoots.status == Loader.Ready
+    }
+  }
+
+}

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/selectioninqmlwidget.cpp

@@ -0,0 +1,47 @@
+/*
+    This file is part of the proxy model test suite.
+
+    SPDX-FileCopyrightText: 2015 Stephen Kelly <steveire@gmail.com>
+
+    SPDX-License-Identifier: LGPL-2.1-or-later
+*/
+
+#include "selectioninqmlwidget.h"
+
+#include <QHBoxLayout>
+#include <QLabel>
+#include <QQmlContext>
+#include <QQmlEngine>
+#include <QQuickWidget>
+#include <QSplitter>
+#include <QTreeView>
+
+#include "dynamictreemodel.h"
+#include "dynamictreewidget.h"
+#include "kselectionproxymodel.h"
+
+SelectionInQmlWidget::SelectionInQmlWidget(QWidget *parent)
+    : QWidget(parent)
+{
+    QHBoxLayout *layout = new QHBoxLayout(this);
+    QSplitter *splitter = new QSplitter(this);
+    layout->addWidget(splitter);
+
+    m_rootModel = new DynamicTreeModel(this);
+
+    new DynamicTreeWidget(m_rootModel, splitter);
+
+    QTreeView *selectionTree = new QTreeView(splitter);
+    selectionTree->setSelectionMode(QAbstractItemView::ExtendedSelection);
+    selectionTree->setModel(m_rootModel);
+    selectionTree->expandAll();
+
+    qmlRegisterType<KSelectionProxyModel>("KF5ItemModels", 1, 0, "SelectionProxyModel");
+
+    QQuickWidget *quickView = new QQuickWidget(splitter);
+
+    quickView->engine()->rootContext()->setContextProperty(QStringLiteral("_model"), m_rootModel);
+    quickView->engine()->rootContext()->setContextProperty(QStringLiteral("_selectionModel"), selectionTree->selectionModel());
+
+    quickView->setSource(QUrl::fromLocalFile(QLatin1String(SRC_DIR "/selection.qml")));
+}

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/selectioninqmlwidget.h

@@ -0,0 +1,27 @@
+/*
+    This file is part of the proxy model test suite.
+
+    SPDX-FileCopyrightText: 2015 Stephen Kelly <steveire@gmail.com>
+
+    SPDX-License-Identifier: LGPL-2.1-or-later
+*/
+
+#ifndef SELECTIONINQML_WIDGET_H
+#define SELECTIONINQML_WIDGET_H
+
+#include <QWidget>
+
+class QTreeView;
+
+class DynamicTreeModel;
+
+class SelectionInQmlWidget : public QWidget
+{
+public:
+    SelectionInQmlWidget(QWidget *parent = nullptr);
+
+private:
+    DynamicTreeModel *m_rootModel;
+};
+
+#endif

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/selectionpmwidget.cpp

@@ -0,0 +1,150 @@
+/*
+    This file is part of the proxy model test suite.
+
+    SPDX-FileCopyrightText: 2009 Stephen Kelly <steveire@gmail.com>
+
+    SPDX-License-Identifier: LGPL-2.1-or-later
+*/
+
+#include "selectionpmwidget.h"
+
+#include <QHBoxLayout>
+#include <QLabel>
+#include <QSplitter>
+#include <QTreeView>
+
+#include "dynamictreemodel.h"
+#include "dynamictreewidget.h"
+#include "kselectionproxymodel.h"
+
+SelectionProxyWidget::SelectionProxyWidget(QWidget *parent)
+    : QWidget(parent)
+{
+    QHBoxLayout *layout = new QHBoxLayout(this);
+    QSplitter *splitter = new QSplitter(this);
+    layout->addWidget(splitter);
+
+    m_rootModel = new DynamicTreeModel(this);
+
+    DynamicTreeWidget *dynTreeWidget = new DynamicTreeWidget(m_rootModel, splitter);
+
+    dynTreeWidget->setInitialTree(
+        QLatin1String("- 1"
+                      "- 2"
+                      "- - 3"
+                      "- - 3"
+                      "- - - 4"
+                      "- - - 4"
+                      "- - - - 4"
+                      "- - 4"
+                      "- - 5"
+                      "- - - 4"
+                      "- - - - 4"
+                      "- - 5"
+                      "- 6"
+                      "- 7"
+                      "- - 8"
+                      "- - - 9"
+                      "- - - 10"
+                      "- - - - 9"
+                      "- - - - - 10"
+                      "- - - - - - 9"
+                      "- - - - - - 10"
+                      "- - - - - - - 9"
+                      "- - - - - - - - 10"
+                      "- - - - - - - - 9"
+                      "- - - - - - - 10"
+                      "- - - - - 9"
+                      "- - - - - 9"
+                      "- - - - - 9"
+                      "- - - - - 10"
+                      "- - - - - - 9"
+                      "- - - - - - 10"
+                      "- - - - - 9"
+                      "- - - - - 9"
+                      "- - - - - 9"
+                      "- - - - - 10"
+                      "- - - - - - 9"
+                      "- - - - - - 10"
+                      "- - - - 10"
+                      "- - 11"
+                      "- - 12"
+                      "- 13"
+                      "- 14"
+                      "- 15"
+                      "- - 16"
+                      "- - - 17"
+                      "- - - 18"
+                      "- 19"
+                      "- 20"
+                      "- 21"));
+
+    QTreeView *selectionTree = createLabelledView(QStringLiteral("Selection"), splitter);
+    selectionTree->setSelectionMode(QAbstractItemView::ExtendedSelection);
+    selectionTree->setModel(m_rootModel);
+    selectionTree->expandAll();
+
+#define SUBTREES
+#define SUBTREEROOTS
+#define SUBTREESWITHOUTROOTS
+#define EXACTSELECTION
+#define CHILDRENOFEXACTSELECTION
+
+#ifdef SUBTREES
+    KSelectionProxyModel *selectedBranchesModel = new KSelectionProxyModel(selectionTree->selectionModel(), this);
+    selectedBranchesModel->setSourceModel(m_rootModel);
+    selectedBranchesModel->setFilterBehavior(KSelectionProxyModel::SubTrees);
+
+    QTreeView *selectedBranchesView = createLabelledView(QStringLiteral("SubTrees"), splitter);
+    selectedBranchesView->setModel(selectedBranchesModel);
+#endif
+
+#ifdef SUBTREEROOTS
+    KSelectionProxyModel *selectedBranchesRootsModel = new KSelectionProxyModel(selectionTree->selectionModel(), this);
+    selectedBranchesRootsModel->setSourceModel(m_rootModel);
+    selectedBranchesRootsModel->setFilterBehavior(KSelectionProxyModel::SubTreeRoots);
+
+    QTreeView *selectedBranchesRootsView = createLabelledView(QStringLiteral("SubTreeRoots"), splitter);
+    selectedBranchesRootsView->setModel(selectedBranchesRootsModel);
+#endif
+
+#ifdef SUBTREESWITHOUTROOTS
+    KSelectionProxyModel *selectedBranchesChildrenModel = new KSelectionProxyModel(selectionTree->selectionModel(), this);
+    selectedBranchesChildrenModel->setSourceModel(m_rootModel);
+    selectedBranchesChildrenModel->setFilterBehavior(KSelectionProxyModel::SubTreesWithoutRoots);
+
+    QTreeView *selectedBranchesChildrenView = createLabelledView(QStringLiteral("SubTreesWithoutRoots"), splitter);
+    selectedBranchesChildrenView->setModel(selectedBranchesChildrenModel);
+#endif
+
+#ifdef EXACTSELECTION
+    KSelectionProxyModel *onlySelectedModel = new KSelectionProxyModel(selectionTree->selectionModel(), this);
+    onlySelectedModel->setSourceModel(m_rootModel);
+    onlySelectedModel->setFilterBehavior(KSelectionProxyModel::ExactSelection);
+
+    QTreeView *onlySelectedView = createLabelledView(QStringLiteral("ExactSelection"), splitter);
+    onlySelectedView->setModel(onlySelectedModel);
+#endif
+
+#ifdef CHILDRENOFEXACTSELECTION
+    KSelectionProxyModel *onlySelectedChildrenModel = new KSelectionProxyModel(selectionTree->selectionModel(), this);
+    onlySelectedChildrenModel->setSourceModel(m_rootModel);
+    onlySelectedChildrenModel->setFilterBehavior(KSelectionProxyModel::ChildrenOfExactSelection);
+
+    QTreeView *onlySelectedChildrenView = createLabelledView(QStringLiteral("ChildrenOfExactSelection"), splitter);
+    onlySelectedChildrenView->setModel(onlySelectedChildrenModel);
+#endif
+}
+
+QTreeView *SelectionProxyWidget::createLabelledView(const QString &labelText, QWidget *parent)
+{
+    QWidget *labelledTreeWidget = new QWidget(parent);
+    QVBoxLayout *layout = new QVBoxLayout(labelledTreeWidget);
+
+    QLabel *label = new QLabel(labelText, labelledTreeWidget);
+    QTreeView *treeview = new QTreeView(labelledTreeWidget);
+
+    layout->addWidget(label);
+    layout->addWidget(treeview);
+    return treeview;
+}

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/selectionpmwidget.h

@@ -0,0 +1,30 @@
+/*
+    This file is part of the proxy model test suite.
+
+    SPDX-FileCopyrightText: 2009 Stephen Kelly <steveire@gmail.com>
+
+    SPDX-License-Identifier: LGPL-2.1-or-later
+*/
+
+#ifndef SELECTION_PM_WIDGET_H
+#define SELECTION_PM_WIDGET_H
+
+#include <QWidget>
+
+class QTreeView;
+
+class DynamicTreeModel;
+
+class SelectionProxyWidget : public QWidget
+{
+public:
+    SelectionProxyWidget(QWidget *parent = nullptr);
+
+protected:
+    QTreeView *createLabelledView(const QString &labelText, QWidget *parent);
+
+private:
+    DynamicTreeModel *m_rootModel;
+};
+
+#endif

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/statesaverwidget.cpp

@@ -0,0 +1,85 @@
+/*
+    SPDX-FileCopyrightText: 2010 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.net>
+    SPDX-FileContributor: Stephen Kelly <stephen@kdab.com>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+
+#include "statesaverwidget.h"
+
+#include <QApplication>
+#include <QSplitter>
+#include <QTreeView>
+
+#include <KConfig>
+#include <KConfigGroup>
+#include <ksharedconfig.h>
+
+#include "dynamictreemodel.h"
+#include "dynamictreewidget.h"
+
+QModelIndex DynamicTreeStateSaver::indexFromConfigString(const QAbstractItemModel *model, const QString &key) const
+{
+    QModelIndexList list = model->match(model->index(0, 0), DynamicTreeModel::DynamicTreeModelId, key.toInt(), 1, Qt::MatchRecursive);
+    if (list.isEmpty()) {
+        return QModelIndex();
+    }
+    return list.first();
+}
+
+QString DynamicTreeStateSaver::indexToConfigString(const QModelIndex &index) const
+{
+    return index.data(DynamicTreeModel::DynamicTreeModelId).toString();
+}
+
+DynamicTreeStateSaver::DynamicTreeStateSaver(QObject *parent)
+    : KViewStateSaver(parent)
+{
+}
+
+StateSaverWidget::StateSaverWidget(QWidget *parent, Qt::WindowFlags f)
+    : QWidget(parent, f)
+{
+    QSplitter *splitter = new QSplitter(this);
+    QHBoxLayout *layout = new QHBoxLayout(this);
+    layout->addWidget(splitter);
+
+    DynamicTreeModel *model = new DynamicTreeModel(this);
+
+    DynamicTreeWidget *dynamicTreeWidget = new DynamicTreeWidget(model, splitter);
+
+    m_view = new QTreeView(splitter);
+    m_view->setSelectionMode(QAbstractItemView::ExtendedSelection);
+    m_view->setModel(model);
+
+    connect(model, SIGNAL(modelAboutToBeReset()), SLOT(saveState()));
+    connect(model, SIGNAL(modelReset()), SLOT(restoreState()));
+    connect(qApp, SIGNAL(aboutToQuit()), SLOT(saveState()));
+
+    restoreState();
+}
+
+StateSaverWidget::~StateSaverWidget()
+{
+    saveState();
+}
+
+void StateSaverWidget::saveState()
+{
+    DynamicTreeStateSaver saver;
+    saver.setView(m_view);
+
+    KConfigGroup cfg(KSharedConfig::openConfig(), "ExampleViewState");
+    saver.saveState(cfg);
+    cfg.sync();
+}
+
+void StateSaverWidget::restoreState()
+{
+    DynamicTreeStateSaver *saver = new DynamicTreeStateSaver;
+    saver->setView(m_view);
+    KConfigGroup cfg(KSharedConfig::openConfig(), "ExampleViewState");
+    saver->restoreState(cfg);
+}
+
+#include "moc_statesaverwidget.cpp"

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/statesaverwidget.h

@@ -0,0 +1,46 @@
+/*
+    SPDX-FileCopyrightText: 2010 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.net>
+    SPDX-FileContributor: Stephen Kelly <stephen@kdab.com>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+
+#ifndef STATESAVERWIDGET_H
+#define STATESAVERWIDGET_H
+
+#include <QWidget>
+
+#include <KViewStateSaver>
+
+class QTreeView;
+
+class DynamicTreeWidget;
+
+class DynamicTreeStateSaver : public KViewStateSaver
+{
+    Q_OBJECT
+public:
+    DynamicTreeStateSaver(QObject *parent = nullptr);
+
+protected:
+    /* reimp */ QModelIndex indexFromConfigString(const QAbstractItemModel *model, const QString &key) const;
+    /* reimp */ QString indexToConfigString(const QModelIndex &index) const;
+};
+
+class StateSaverWidget : public QWidget
+{
+    Q_OBJECT
+public:
+    StateSaverWidget(QWidget *parent = nullptr, Qt::WindowFlags f = Qt::WindowFlags());
+    ~StateSaverWidget();
+
+private Q_SLOTS:
+    void saveState();
+    void restoreState();
+
+private:
+    DynamicTreeWidget *m_dynamicTreeWidget;
+    QTreeView *m_view;
+};
+
+#endif

local/recipes/kde/kf6-kitemmodels/source/tests/proxymodeltestapp/tree.qml

@@ -0,0 +1,94 @@
+ /*
+    SPDX-FileCopyrightText: 2020 Marco Martin <mart@kde.org>
+
+    SPDX-License-Identifier: LGPL-2.0-or-later
+*/
+import QtQuick 2.6
+import QtQuick.Layouts 1.4
+import QtQuick.Controls as QQC2
+import org.kde.kitemmodels 1.0 
+import org.kde.qqc2desktopstyle.private 1.0 as StylePrivate
+
+
+QQC2.ScrollView {
+    id: root
+    width: 600
+    height: 500
+
+    ListView {
+        spacing: 0
+        clip: true
+        add: Transition {
+            NumberAnimation {
+                property: "opacity"; from: 0; to: 1; duration: 250 }
+        }
+        addDisplaced: Transition {
+            NumberAnimation { properties: "y"; duration: 250 }
+        }
+        remove: Transition {
+            NumberAnimation {
+                property: "opacity"; from: 1; to: 0; duration: 250 }
+        }
+        removeDisplaced: Transition {
+            NumberAnimation { properties: "y"; duration: 250 }
+        }
+        model: KDescendantsProxyModel {
+            id: descendantsModel
+            expandsByDefault: false
+            model: _model
+        }
+
+        delegate: QQC2.ItemDelegate {
+            id: delegate
+            highlighted: false
+
+            contentItem: RowLayout {
+            RowLayout {
+                    Layout.topMargin: -delegate.topPadding
+                    Layout.bottomMargin: -delegate.bottomPadding
+                    Repeater {
+                        
+                        model: kDescendantLevel-1
+                        
+                        delegate: StylePrivate.StyleItem {
+                            Layout.preferredWidth: controlRoot.width
+                            Layout.fillHeight: true
+                            visible: true
+                        // control: controlRoot
+                            elementType: "itembranchindicator"
+                            properties: {
+                                "isItem": false,
+                                "hasSibling": kDescendantHasSiblings[modelData]
+                            }
+                        }
+                    }
+                    QQC2.Button {
+                        id: controlRoot
+                        Layout.preferredWidth: background.pixelMetric("treeviewindentation")
+                        Layout.fillHeight: true
+                        enabled: model.kDescendantExpandable
+                        text: model.kDescendantExpanded ? "-" : "+"
+                        onClicked: descendantsModel.toggleChildren(index)
+                        background: StylePrivate.StyleItem {
+                            id: styleitem
+                            control: controlRoot
+                            hover: controlRoot.hovered
+                            elementType: "itembranchindicator"
+                            on: model.kDescendantExpanded 
+                            properties: {
+                                "isItem": true,
+                                "hasChildren": model.kDescendantExpandable,
+                                "hasSibling": model.kDescendantHasSiblings[model.kDescendantHasSiblings.length - 1]
+                            }
+                        }
+                    }
+            }
+                
+                QQC2.Label {
+                    Layout.fillWidth: true
+                    text: model.display
+                }
+            }
+        }
+    }
+}