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55 lines
2.1 KiB
Python
55 lines
2.1 KiB
Python
from tkinter import *
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# this file demonstrates the movement of a single canvas item under mouse control
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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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# remember where the mouse went down
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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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# whatever the mouse is over gets tagged as CURRENT for free by tk.
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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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fred = self.draw.create_oval(0, 0, 20, 20,
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fill="green", tags="selected")
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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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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()
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