| 1 | from Tkinter import *
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| 2 |
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| 3 | # this is the same as simple-demo-1.py, but uses
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| 4 | # subclassing.
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| 5 | # note that there is no explicit call to start Tk.
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| 6 | # Tkinter is smart enough to start the system if it's not already going.
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| 7 |
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| 8 | class Test(Frame):
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| 9 | def printit(self):
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| 10 | print "hi"
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| 11 |
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| 12 | def createWidgets(self):
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| 13 | self.QUIT = Button(self, text='QUIT',
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| 14 | background='red',
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| 15 | foreground='white',
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| 16 | height=3,
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| 17 | command=self.quit)
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| 18 | self.QUIT.pack(side=BOTTOM, fill=BOTH)
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| 19 |
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| 20 | self.canvasObject = Canvas(self, width="5i", height="5i")
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| 21 | self.canvasObject.pack(side=LEFT)
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| 22 |
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| 23 | def mouseDown(self, event):
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| 24 | # canvas x and y take the screen coords from the event and translate
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| 25 | # them into the coordinate system of the canvas object
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| 26 | self.startx = self.canvasObject.canvasx(event.x, self.griddingSize)
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| 27 | self.starty = self.canvasObject.canvasy(event.y, self.griddingSize)
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| 28 |
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| 29 | def mouseMotion(self, event):
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| 30 | # canvas x and y take the screen coords from the event and translate
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| 31 | # them into the coordinate system of the canvas object
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| 32 | x = self.canvasObject.canvasx(event.x, self.griddingSize)
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| 33 | y = self.canvasObject.canvasy(event.y, self.griddingSize)
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| 34 |
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| 35 | if (self.startx != event.x) and (self.starty != event.y) :
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| 36 | self.canvasObject.delete(self.rubberbandBox)
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| 37 | self.rubberbandBox = self.canvasObject.create_rectangle(
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| 38 | self.startx, self.starty, x, y)
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| 39 | # this flushes the output, making sure that
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| 40 | # the rectangle makes it to the screen
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| 41 | # before the next event is handled
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| 42 | self.update_idletasks()
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| 43 |
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| 44 | def __init__(self, master=None):
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| 45 | Frame.__init__(self, master)
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| 46 | Pack.config(self)
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| 47 | self.createWidgets()
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| 48 |
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| 49 | # this is a "tagOrId" for the rectangle we draw on the canvas
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| 50 | self.rubberbandBox = None
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| 51 |
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| 52 | # this is the size of the gridding squares
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| 53 | self.griddingSize = 50
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| 54 |
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| 55 | Widget.bind(self.canvasObject, "<Button-1>", self.mouseDown)
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| 56 | Widget.bind(self.canvasObject, "<Button1-Motion>", self.mouseMotion)
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| 57 |
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| 58 |
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| 59 | test = Test()
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| 60 |
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| 61 | test.mainloop()
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