86 lines
2.6 KiB
Python
86 lines
2.6 KiB
Python
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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, "tag" : "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',
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'fg': '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",
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"command" : self.makeNewDot,
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"fg" : "blue"})
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self.label = Message(self,
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{"width" : "5i",
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"text" : SELECTED_COLOR + " dots are selected and can be dragged.\n" +
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UNSELECTED_COLOR + " 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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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()
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