tkinter.dnd — 拖放支持

源代码： Lib/tkinter/dnd.py

注意

This is experimental and due to be deprecated when it is replaced with the Tk DND.

The tkinter.dnd module provides drag-and-drop support for objects within a single application, within the same window or between windows. To enable an object to be dragged, you must create an event binding for it that starts the drag-and-drop process. Typically, you bind a ButtonPress event to a callback function that you write (see Bindings and Events ). The function should call dnd_start() , where ‘source’ is the object to be dragged, and ‘event’ is the event that invoked the call (the argument to your callback function).

Selection of a target object occurs as follows:

  1. Top-down search of area under mouse for target widget

  • Target widget should have a callable dnd_accept 属性

  • 若 dnd_accept is not present or returns None , search moves to parent widget

  • If no target widget is found, then the target object is None

  1. Call to <old_target>.dnd_leave(source, event)

  2. Call to <new_target>.dnd_enter(source, event)

  3. Call to <target>.dnd_commit(source, event) to notify of drop

  4. Call to <source>.dnd_end(target, event) to signal end of drag-and-drop

class tkinter.dnd. DndHandler ( source , event )

The DndHandler class handles drag-and-drop events tracking Motion and ButtonRelease events on the root of the event widget.

cancel ( event = None )

Cancel the drag-and-drop process.

finish ( event , commit = 0 )

Execute end of drag-and-drop functions.

on_motion ( event )

Inspect area below mouse for target objects while drag is performed.

on_release ( event )

Signal end of drag when the release pattern is triggered.

tkinter.dnd. dnd_start ( source , event )

Factory function for drag-and-drop process.

另请参阅

Bindings and Events