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65 lines
2.1 KiB
ReStructuredText
65 lines
2.1 KiB
ReStructuredText
:mod:`!tkinter.dnd` --- Drag and drop support
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=============================================
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.. module:: tkinter.dnd
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:platform: Tk
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:synopsis: Tkinter drag-and-drop interface
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**Source code:** :source:`Lib/tkinter/dnd.py`
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--------------
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.. note:: This is experimental and due to be deprecated when it is replaced
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with the Tk DND.
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The :mod:`tkinter.dnd` module provides drag-and-drop support for objects within
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a single application, within the same window or between windows. To enable an
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object to be dragged, you must create an event binding for it that starts the
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drag-and-drop process. Typically, you bind a ButtonPress event to a callback
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function that you write (see :ref:`Bindings-and-Events`). The function should
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call :func:`dnd_start`, where 'source' is the object to be dragged, and 'event'
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is the event that invoked the call (the argument to your callback function).
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Selection of a target object occurs as follows:
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#. Top-down search of area under mouse for target widget
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* Target widget should have a callable *dnd_accept* attribute
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* If *dnd_accept* is not present or returns ``None``, search moves to parent widget
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* If no target widget is found, then the target object is ``None``
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2. Call to *<old_target>.dnd_leave(source, event)*
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#. Call to *<new_target>.dnd_enter(source, event)*
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#. Call to *<target>.dnd_commit(source, event)* to notify of drop
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#. Call to *<source>.dnd_end(target, event)* to signal end of drag-and-drop
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.. class:: DndHandler(source, event)
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The *DndHandler* class handles drag-and-drop events tracking Motion and
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ButtonRelease events on the root of the event widget.
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.. method:: cancel(event=None)
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Cancel the drag-and-drop process.
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.. method:: finish(event, commit=0)
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Execute end of drag-and-drop functions.
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.. method:: on_motion(event)
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Inspect area below mouse for target objects while drag is performed.
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.. method:: on_release(event)
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Signal end of drag when the release pattern is triggered.
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.. function:: dnd_start(source, event)
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Factory function for drag-and-drop process.
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.. seealso::
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:ref:`Bindings-and-Events`
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