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Viewing changes to Demo/tkinter/matt/canvas-moving-or-creating.py

  • Committer: Bazaar Package Importer
  • Author(s): Matthias Klose
  • Date: 2009-02-13 12:51:00 UTC
  • Revision ID: james.westby@ubuntu.com-20090213125100-uufgcb9yeqzujpqw
Tags: upstream-2.6.1
Import upstream version 2.6.1

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Demo/tkinter/matt/canvas-moving-or-creating.py
 
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from Tkinter import *
 
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# this file demonstrates a more sophisticated movement --
 
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# move dots or create new ones if you click outside the dots
 
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class Test(Frame):
 
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    ###################################################################
 
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    ###### Event callbacks for THE CANVAS (not the stuff drawn on it)
 
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    ###################################################################
 
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    def mouseDown(self, event):
 
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        # see if we're inside a dot. If we are, it
 
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        # gets tagged as CURRENT for free by tk.
 
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        if not event.widget.find_withtag(CURRENT):
 
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            # there is no dot here, so we can make one,
 
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            # and bind some interesting behavior to it.
 
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            # ------
 
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            # create a dot, and mark it as CURRENT
 
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            fred = self.draw.create_oval(
 
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                event.x - 10, event.y -10, event.x +10, event.y + 10,
 
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                fill="green", tags=CURRENT)
 
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            self.draw.tag_bind(fred, "<Any-Enter>", self.mouseEnter)
 
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            self.draw.tag_bind(fred, "<Any-Leave>", self.mouseLeave)
 
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        self.lastx = event.x
 
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        self.lasty = event.y
 
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    def mouseMove(self, event):
 
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        self.draw.move(CURRENT, event.x - self.lastx, event.y - self.lasty)
 
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        self.lastx = event.x
 
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        self.lasty = event.y
 
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    ###################################################################
 
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    ###### Event callbacks for canvas ITEMS (stuff drawn on the canvas)
 
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    ###################################################################
 
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    def mouseEnter(self, event):
 
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        # the CURRENT tag is applied to the object the cursor is over.
 
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        # this happens automatically.
 
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        self.draw.itemconfig(CURRENT, fill="red")
 
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    def mouseLeave(self, event):
 
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        # the CURRENT tag is applied to the object the cursor is over.
 
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        # this happens automatically.
 
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        self.draw.itemconfig(CURRENT, fill="blue")
 
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    def createWidgets(self):
 
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        self.QUIT = Button(self, text='QUIT', foreground='red',
 
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                           command=self.quit)
 
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        self.QUIT.pack(side=LEFT, fill=BOTH)
 
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        self.draw = Canvas(self, width="5i", height="5i")
 
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        self.draw.pack(side=LEFT)
 
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        Widget.bind(self.draw, "<1>", self.mouseDown)
 
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        Widget.bind(self.draw, "<B1-Motion>", self.mouseMove)
 
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    def __init__(self, master=None):
 
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        Frame.__init__(self, master)
 
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        Pack.config(self)
 
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        self.createWidgets()
 
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test = Test()
 
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test.mainloop()