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dnd.py
"""Drag-and-drop support for Tkinter. This is very preliminary. I currently only support dnd *within* one application, between different windows (or within the same window). I am trying to make this as generic as possible -- not dependent on the use of a particular widget or icon type, etc. I also hope that this will work with Pmw. To enable an object to be dragged, you must create an event binding for it that starts the drag-and-drop process. Typically, you should bind <ButtonPress> to a callback function that you write. The function should call Tkdnd.dnd_start(source, event), where 'source' is the object to be dragged, and 'event' is the event that invoked the call (the argument to your callback function). Even though this is a class instantiation, the returned instance should not be stored -- it will be kept alive automatically for the duration of the drag-and-drop. When a drag-and-drop is already in process for the Tk interpreter, the call is *ignored*; this normally averts starting multiple simultaneous dnd processes, e.g. because different button callbacks all dnd_start(). The object is *not* necessarily a widget -- it can be any application-specific object that is meaningful to potential drag-and-drop targets. Potential drag-and-drop targets are discovered as follows. Whenever the mouse moves, and at the start and end of a drag-and-drop move, the Tk widget directly under the mouse is inspected. This is the target widget (not to be confused with the target object, yet to be determined). If there is no target widget, there is no dnd target object. If there is a target widget, and it has an attribute dnd_accept, this should be a function (or any callable object). The function is called as dnd_accept(source, event), where 'source' is the object being dragged (the object passed to dnd_start() above), and 'event' is the most recent event object (generally a <Motion> event; it can also be <ButtonPress> or <ButtonRelease>). If the dnd_accept() function returns something other than None, this is the new dnd target object. If dnd_accept() returns None, or if the target widget has no dnd_accept attribute, the target widget's parent is considered as the target widget, and the search for a target object is repeated from there. If necessary, the search is repeated all the way up to the root widget. If none of the target widgets can produce a target object, there is no target object (the target object is None). The target object thus produced, if any, is called the new target object. It is compared with the old target object (or None, if there was no old target widget). There are several cases ('source' is the source object, and 'event' is the most recent event object): - Both the old and new target objects are None. Nothing happens. - The old and new target objects are the same object. Its method dnd_motion(source, event) is called. - The old target object was None, and the new target object is not None. The new target object's method dnd_enter(source, event) is called. - The new target object is None, and the old target object is not None. The old target object's method dnd_leave(source, event) is called. - The old and new target objects differ and neither is None. The old target object's method dnd_leave(source, event), and then the new target object's method dnd_enter(source, event) is called. Once this is done, the new target object replaces the old one, and the Tk mainloop proceeds. The return value of the methods mentioned above is ignored; if they raise an exception, the normal exception handling mechanisms take over. The drag-and-drop processes can end in two ways: a final target object is selected, or no final target object is selected. When a final target object is selected, it will always have been notified of the potential drop by a call to its dnd_enter() method, as described above, and possibly one or more calls to its dnd_motion() method; its dnd_leave() method has not been called since the last call to dnd_enter(). The target is notified of the drop by a call to its method dnd_commit(source, event). If no final target object is selected, and there was an old target object, its dnd_leave(source, event) method is called to complete the dnd sequence. Finally, the source object is notified that the drag-and-drop process is over, by a call to source.dnd_end(target, event), specifying either the selected target object, or None if no target object was selected. The source object can use this to implement the commit action; this is sometimes simpler than to do it in the target's dnd_commit(). The target's dnd_commit() method could then simply be aliased to dnd_leave(). At any time during a dnd sequence, the application can cancel the sequence by calling the cancel() method on the object returned by dnd_start(). This will call dnd_leave() if a target is currently active; it will never call dnd_commit(). """ import tkinter __all__ = ["dnd_start", "DndHandler"] # The factory function def dnd_start(source, event): h = DndHandler(source, event) if h.root is not None: return h else: return None # The class that does the work class DndHandler: root = None def __init__(self, source, event): if event.num > 5: return root = event.widget._root() try: root.__dnd return # Don't start recursive dnd except AttributeError: root.__dnd = self self.root = root self.source = source self.target = None self.initial_button = button = event.num self.initial_widget = widget = event.widget self.release_pattern = "<B%d-ButtonRelease-%d>" % (button, button) self.save_cursor = widget['cursor'] or "" widget.bind(self.release_pattern, self.on_release) widget.bind("<Motion>", self.on_motion) widget['cursor'] = "hand2" def __del__(self): root = self.root self.root = None if root is not None: try: del root.__dnd except AttributeError: pass def on_motion(self, event): x, y = event.x_root, event.y_root target_widget = self.initial_widget.winfo_containing(x, y) source = self.source new_target = None while target_widget is not None: try: attr = target_widget.dnd_accept except AttributeError: pass else: new_target = attr(source, event) if new_target is not None: break target_widget = target_widget.master old_target = self.target if old_target is new_target: if old_target is not None: old_target.dnd_motion(source, event) else: if old_target is not None: self.target = None old_target.dnd_leave(source, event) if new_target is not None: new_target.dnd_enter(source, event) self.target = new_target def on_release(self, event): self.finish(event, 1) def cancel(self, event=None): self.finish(event, 0) def finish(self, event, commit=0): target = self.target source = self.source widget = self.initial_widget root = self.root try: del root.__dnd self.initial_widget.unbind(self.release_pattern) self.initial_widget.unbind("<Motion>") widget['cursor'] = self.save_cursor self.target = self.source = self.initial_widget = self.root = None if target is not None: if commit: target.dnd_commit(source, event) else: target.dnd_leave(source, event) finally: source.dnd_end(target, event) # ---------------------------------------------------------------------- # The rest is here for testing and demonstration purposes only! class Icon: def __init__(self, name): self.name = name self.canvas = self.label = self.id = None def attach(self, canvas, x=10, y=10): if canvas is self.canvas: self.canvas.coords(self.id, x, y) return if self.canvas is not None: self.detach() if canvas is None: return label = tkinter.Label(canvas, text=self.name, borderwidth=2, relief="raised") id = canvas.create_window(x, y, window=label, anchor="nw") self.canvas = canvas self.label = label self.id = id label.bind("<ButtonPress>", self.press) def detach(self): canvas = self.canvas if canvas is None: return id = self.id label = self.label self.canvas = self.label = self.id = None canvas.delete(id) label.destroy() def press(self, event): if dnd_start(self, event): # where the pointer is relative to the label widget: self.x_off = event.x self.y_off = event.y # where the widget is relative to the canvas: self.x_orig, self.y_orig = self.canvas.coords(self.id) def move(self, event): x, y = self.where(self.canvas, event) self.canvas.coords(self.id, x, y) def putback(self): self.canvas.coords(self.id, self.x_orig, self.y_orig) def where(self, canvas, event): # where the corner of the canvas is relative to the screen: x_org = canvas.winfo_rootx() y_org = canvas.winfo_rooty() # where the pointer is relative to the canvas widget: x = event.x_root - x_org y = event.y_root - y_org # compensate for initial pointer offset return x - self.x_off, y - self.y_off def dnd_end(self, target, event): pass class Tester: def __init__(self, root): self.top = tkinter.Toplevel(root) self.canvas = tkinter.Canvas(self.top, width=100, height=100) self.canvas.pack(fill="both", expand=1) self.canvas.dnd_accept = self.dnd_accept def dnd_accept(self, source, event): return self def dnd_enter(self, source, event): self.canvas.focus_set() # Show highlight border x, y = source.where(self.canvas, event) x1, y1, x2, y2 = source.canvas.bbox(source.id) dx, dy = x2-x1, y2-y1 self.dndid = self.canvas.create_rectangle(x, y, x+dx, y+dy) self.dnd_motion(source, event) def dnd_motion(self, source, event): x, y = source.where(self.canvas, event) x1, y1, x2, y2 = self.canvas.bbox(self.dndid) self.canvas.move(self.dndid, x-x1, y-y1) def dnd_leave(self, source, event): self.top.focus_set() # Hide highlight border self.canvas.delete(self.dndid) self.dndid = None def dnd_commit(self, source, event): self.dnd_leave(source, event) x, y = source.where(self.canvas, event) source.attach(self.canvas, x, y) def test(): root = tkinter.Tk() root.geometry("+1+1") tkinter.Button(command=root.quit, text="Quit").pack() t1 = Tester(root) t1.top.geometry("+1+60") t2 = Tester(root) t2.top.geometry("+120+60") t3 = Tester(root) t3.top.geometry("+240+60") i1 = Icon("ICON1") i2 = Icon("ICON2") i3 = Icon("ICON3") i1.attach(t1.canvas) i2.attach(t2.canvas) i3.attach(t3.canvas) root.mainloop() if __name__ == '__main__': test()
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