vasilito
cf12defd28
Ultraworked with [Sisyphus](https://github.com/code-yeongyu/oh-my-openagent) Co-authored-by: Sisyphus <clio-agent@sisyphuslabs.ai>
114 lines
3.8 KiB
C++
114 lines
3.8 KiB
C++
// SPDX-FileCopyrightText: 2007 Klarälvdalens Datakonsult AB
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// SPDX-FileCopyrightText: 2022 g10 Code GmbH
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// SPDX-FileContributor: Ingo Klöcker <dev@ingo-kloecker.de>
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// SPDX-FileContributor: Carl Schwan <carl.schwan@gnupg.com>
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//
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// SPDX-License-Identifier: LGPL-2.1-or-later
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#include "kadjustingscrollarea.h"
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#include <QApplication>
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#include <QResizeEvent>
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#include <QScreen>
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#include <QScrollBar>
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#include <QVBoxLayout>
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KAdjustingScrollArea::KAdjustingScrollArea(QWidget *parent)
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: QScrollArea{parent}
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{
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setWidgetResizable(true);
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connect(qApp, &QApplication::focusChanged, this, [this](QWidget *old, QWidget *now) {
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Q_UNUSED(old);
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ensureWidgetVisible(now);
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});
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viewport()->installEventFilter(this);
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}
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KAdjustingScrollArea::~KAdjustingScrollArea()
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{
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viewport()->removeEventFilter(this);
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if (auto w = widget()) {
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w->removeEventFilter(this);
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}
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}
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QSize KAdjustingScrollArea::minimumSizeHint() const
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{
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const int fw = frameWidth();
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QSize sz{2 * fw, 2 * fw};
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sz += {widget()->minimumSizeHint().width(), 0};
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if (verticalScrollBarPolicy() != Qt::ScrollBarAlwaysOff) {
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sz.setWidth(sz.width() + verticalScrollBar()->sizeHint().width());
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}
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if (horizontalScrollBarPolicy() != Qt::ScrollBarAlwaysOff) {
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sz.setHeight(sz.height() + horizontalScrollBar()->sizeHint().height());
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}
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return QScrollArea::minimumSizeHint().expandedTo(sz);
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}
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QSize KAdjustingScrollArea::sizeHint() const
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{
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const int fw = frameWidth();
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QSize sz{2 * fw, 2 * fw};
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sz += viewportSizeHint();
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if (verticalScrollBarPolicy() != Qt::ScrollBarAlwaysOff) {
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sz.setWidth(sz.width() + verticalScrollBar()->sizeHint().width());
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}
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if (horizontalScrollBarPolicy() != Qt::ScrollBarAlwaysOff) {
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sz.setHeight(sz.height() + horizontalScrollBar()->sizeHint().height());
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}
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sz = QScrollArea::sizeHint().expandedTo(sz);
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return sz;
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}
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static void adjustSizeOfWindowBy(const QSize &extent, QWidget *window)
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{
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if (window) {
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const auto currentSize = window->size();
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// we limit the automatic size adjustment to 2/3 of the screen's size
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const auto maxWindowSize = window->screen()->geometry().size() * 2 / 3;
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const auto newWindowSize = currentSize.expandedTo((currentSize + extent).boundedTo(maxWindowSize));
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if (newWindowSize != currentSize) {
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window->resize(newWindowSize);
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}
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}
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}
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bool KAdjustingScrollArea::eventFilter(QObject *obj, QEvent *ev)
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{
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if (ev->type() == QEvent::ChildAdded && viewport() == obj) {
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auto childAddedEvent = static_cast<QChildEvent *>(ev);
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auto widget = childAddedEvent->child();
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if (widget->objectName().isEmpty()) {
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widget->setObjectName(QLatin1StringView("scrollarea_widget"));
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}
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widget->installEventFilter(this);
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}
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if (ev->type() == QEvent::ChildRemoved && viewport() == obj) {
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auto childRemovedEvent = static_cast<QChildEvent *>(ev);
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auto widget = childRemovedEvent->child();
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widget->removeEventFilter(this);
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}
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if (ev->type() == QEvent::Resize && obj == widget() && sizeAdjustPolicy() == AdjustToContents) {
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const auto *const event = static_cast<QResizeEvent *>(ev);
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if (event->size().height() > event->oldSize().height()) {
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const auto currentViewportHeight = viewport()->height();
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const auto wantedViewportHeight = event->size().height();
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const auto wantedAdditionalHeight = wantedViewportHeight - currentViewportHeight;
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if (wantedAdditionalHeight > 0) {
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adjustSizeOfWindowBy(QSize{0, wantedAdditionalHeight}, window());
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}
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}
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}
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return QScrollArea::eventFilter(obj, ev);
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}
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bool KAdjustingScrollArea::event(QEvent *event)
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{
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return QScrollArea::event(event);
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}
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#include "moc_kadjustingscrollarea.cpp"
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