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Viewing changes to Demo/tkinter/matt/canvas-mult-item-sel.py

  • Committer: Bazaar Package Importer
  • Author(s): Matthias Klose
  • Date: 2009-03-23 00:01:27 UTC
  • Revision ID: james.westby@ubuntu.com-20090323000127-5fstfxju4ufrhthq
Tags: upstream-3.1~a1+20090322
Import upstream version 3.1~a1+20090322

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Demo/tkinter/matt/canvas-mult-item-sel.py
 
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from tkinter import *
 
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# allows moving dots with multiple selection.
 
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SELECTED_COLOR = "red"
 
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UNSELECTED_COLOR = "blue"
 
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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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            # we clicked outside of all dots on the canvas. unselect all.
 
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            # re-color everything back to an unselected color
 
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            self.draw.itemconfig("selected", fill=UNSELECTED_COLOR)
 
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            # unselect everything
 
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            self.draw.dtag("selected")
 
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        else:
 
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            # mark as "selected" the thing the cursor is under
 
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            self.draw.addtag("selected", "withtag", CURRENT)
 
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            # color it as selected
 
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            self.draw.itemconfig("selected", fill=SELECTED_COLOR)
 
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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("selected", 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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    def makeNewDot(self):
 
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        # create a dot, and mark it as current
 
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        fred = self.draw.create_oval(0, 0, 20, 20,
 
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                                     fill=SELECTED_COLOR, tags=CURRENT)
 
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        # and make it selected
 
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        self.draw.addtag("selected", "withtag", CURRENT)
 
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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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        ################
 
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        # make the canvas and bind some behavior to it
 
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        ################
 
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        self.draw = Canvas(self, width="5i", height="5i")
 
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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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        # and other things.....
 
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        self.button = Button(self, text="make a new dot", foreground="blue",
 
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                             command=self.makeNewDot)
 
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        message = ("%s dots are selected and can be dragged.\n"
 
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                   "%s are not selected.\n"
 
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                   "Click in a dot to select it.\n"
 
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                   "Click on empty space to deselect all dots."
 
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                   ) % (SELECTED_COLOR, UNSELECTED_COLOR)
 
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        self.label = Message(self, width="5i", text=message)
 
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        self.QUIT.pack(side=BOTTOM, fill=BOTH)
 
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        self.label.pack(side=BOTTOM, fill=X, expand=1)
 
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        self.button.pack(side=BOTTOM, fill=X)
 
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        self.draw.pack(side=LEFT)
 
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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()