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Diffstat (limited to 'Demo/tkinter/guido/canvasevents.py')
| -rw-r--r-- | Demo/tkinter/guido/canvasevents.py | 264 |
1 files changed, 0 insertions, 264 deletions
diff --git a/Demo/tkinter/guido/canvasevents.py b/Demo/tkinter/guido/canvasevents.py deleted file mode 100644 index 16312b5..0000000 --- a/Demo/tkinter/guido/canvasevents.py +++ /dev/null @@ -1,264 +0,0 @@ -#! /usr/bin/env python3 - -from tkinter import * - - -# Since Canvas.Group is no longer present, the following class reproduces -# a subset of the old Group class that is used by this app. - -class Group: - def __init__(self, canvas, tag=None): - if tag is None: - tag = 'Group%d' % id(self) - - self.tag = self.id = tag - self.canvas = canvas - self.canvas.dtag(self.tag) - - def __str__(self): - return self.tag - - def _do(self, cmd, *args): - return self.canvas.tk.call(self.canvas._w, cmd, self.tag, *args) - - def addtag_withtag(self, tagOrId): - self._do('addtag', 'withtag', tagOrId) - - def bind(self, sequence=None, command=None, add=None): - return self.canvas.tag_bind(self.id, sequence, command, add) - - def move(self, x_amount, y_amount): - self._do('move', x_amount, y_amount) - - def dtag(self, tagToDelete=None): - self._do('dtag', tagToDelete) - - def tkraise(self, aboveThis=None): - self._do('raise', aboveThis) - - -class Object: - - """Base class for composite graphical objects. - - Objects belong to a canvas, and can be moved around on the canvas. - They also belong to at most one ``pile'' of objects, and can be - transferred between piles (or removed from their pile). - - Objects have a canonical ``x, y'' position which is moved when the - object is moved. Where the object is relative to this position - depends on the object; for simple objects, it may be their center. - - Objects have mouse sensitivity. They can be clicked, dragged and - double-clicked. The behavior may actually determined by the pile - they are in. - - All instance attributes are public since the derived class may - need them. - """ - - def __init__(self, canvas, x=0, y=0, fill='red', text='object'): - self.canvas = canvas - self.x = x - self.y = y - self.pile = None - self.group = Group(self.canvas) - self.createitems(fill, text) - - def __str__(self): - return str(self.group) - - def createitems(self, fill, text): - self.__oval = self.canvas.create_oval(self.x - 20, self.y - 10, - self.x + 20, self.y + 20, fill=fill, width=3) - self.group.addtag_withtag(self.__oval) - self.__text = self.canvas.create_text(self.x, self.y, text=text) - self.group.addtag_withtag(self.__text) - - def moveby(self, dx, dy): - if dx == dy == 0: - return - self.group.move(dx, dy) - self.x = self.x + dx - self.y = self.y + dy - - def moveto(self, x, y): - self.moveby(x - self.x, y - self.y) - - def transfer(self, pile): - if self.pile: - self.pile.delete(self) - self.pile = None - self.pile = pile - if self.pile: - self.pile.add(self) - - def tkraise(self): - self.group.tkraise() - - -class Bottom(Object): - """An object to serve as the bottom of a pile.""" - - def createitems(self, *args): - self.__oval = self.canvas.create_oval(self.x - 20, self.y - 10, - self.x + 20, self.y + 10, fill='gray', outline='') - self.group.addtag_withtag(self.__oval) - - -class Pile: - """A group of graphical objects.""" - - def __init__(self, canvas, x, y, tag=None): - self.canvas = canvas - self.x = x - self.y = y - self.objects = [] - self.bottom = Bottom(self.canvas, self.x, self.y) - self.group = Group(self.canvas, tag=tag) - self.group.addtag_withtag(self.bottom.group) - self.bindhandlers() - - def bindhandlers(self): - self.group.bind('<1>', self.clickhandler) - self.group.bind('<Double-1>', self.doubleclickhandler) - - def add(self, object): - self.objects.append(object) - self.group.addtag_withtag(object.group) - self.position(object) - - def delete(self, object): - object.group.dtag(self.group) - self.objects.remove(object) - - def position(self, object): - object.tkraise() - i = self.objects.index(object) - object.moveto(self.x + i*4, self.y + i*8) - - def clickhandler(self, event): - pass - - def doubleclickhandler(self, event): - pass - - -class MovingPile(Pile): - - def bindhandlers(self): - Pile.bindhandlers(self) - self.group.bind('<B1-Motion>', self.motionhandler) - self.group.bind('<ButtonRelease-1>', self.releasehandler) - - movethis = None - - def clickhandler(self, event): - tags = self.canvas.gettags('current') - for i in range(len(self.objects)): - o = self.objects[i] - if o.group.tag in tags: - break - else: - self.movethis = None - return - self.movethis = self.objects[i:] - for o in self.movethis: - o.tkraise() - self.lastx = event.x - self.lasty = event.y - - doubleclickhandler = clickhandler - - def motionhandler(self, event): - if not self.movethis: - return - dx = event.x - self.lastx - dy = event.y - self.lasty - self.lastx = event.x - self.lasty = event.y - for o in self.movethis: - o.moveby(dx, dy) - - def releasehandler(self, event): - objects = self.movethis - if not objects: - return - self.movethis = None - self.finishmove(objects) - - def finishmove(self, objects): - for o in objects: - self.position(o) - - -class Pile1(MovingPile): - - x = 50 - y = 50 - tag = 'p1' - - def __init__(self, demo): - self.demo = demo - MovingPile.__init__(self, self.demo.canvas, self.x, self.y, self.tag) - - def doubleclickhandler(self, event): - try: - o = self.objects[-1] - except IndexError: - return - o.transfer(self.other()) - MovingPile.doubleclickhandler(self, event) - - def other(self): - return self.demo.p2 - - def finishmove(self, objects): - o = objects[0] - p = self.other() - x, y = o.x, o.y - if (x-p.x)**2 + (y-p.y)**2 < (x-self.x)**2 + (y-self.y)**2: - for o in objects: - o.transfer(p) - else: - MovingPile.finishmove(self, objects) - -class Pile2(Pile1): - - x = 150 - y = 50 - tag = 'p2' - - def other(self): - return self.demo.p1 - - -class Demo: - - def __init__(self, master): - self.master = master - self.canvas = Canvas(master, - width=200, height=200, - background='yellow', - relief=SUNKEN, borderwidth=2) - self.canvas.pack(expand=1, fill=BOTH) - self.p1 = Pile1(self) - self.p2 = Pile2(self) - o1 = Object(self.canvas, fill='red', text='o1') - o2 = Object(self.canvas, fill='green', text='o2') - o3 = Object(self.canvas, fill='light blue', text='o3') - o1.transfer(self.p1) - o2.transfer(self.p1) - o3.transfer(self.p2) - - -# Main function, run when invoked as a stand-alone Python program. - -def main(): - root = Tk() - demo = Demo(root) - root.protocol('WM_DELETE_WINDOW', root.quit) - root.mainloop() - -if __name__ == '__main__': - main() |