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61 lines
2.2 KiB
Python
61 lines
2.2 KiB
Python
from tkinter import *
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# this is the same as simple-demo-1.py, but uses
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# subclassing.
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# note that there is no explicit call to start Tk.
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# Tkinter is smart enough to start the system if it's not already going.
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class Test(Frame):
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def printit(self):
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print("hi")
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def createWidgets(self):
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self.QUIT = Button(self, text='QUIT',
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background='red',
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foreground='white',
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height=3,
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command=self.quit)
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self.QUIT.pack(side=BOTTOM, fill=BOTH)
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self.canvasObject = Canvas(self, width="5i", height="5i")
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self.canvasObject.pack(side=LEFT)
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def mouseDown(self, event):
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# canvas x and y take the screen coords from the event and translate
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# them into the coordinate system of the canvas object
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self.startx = self.canvasObject.canvasx(event.x, self.griddingSize)
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self.starty = self.canvasObject.canvasy(event.y, self.griddingSize)
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def mouseMotion(self, event):
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# canvas x and y take the screen coords from the event and translate
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# them into the coordinate system of the canvas object
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x = self.canvasObject.canvasx(event.x, self.griddingSize)
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y = self.canvasObject.canvasy(event.y, self.griddingSize)
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if (self.startx != event.x) and (self.starty != event.y) :
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self.canvasObject.delete(self.rubberbandBox)
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self.rubberbandBox = self.canvasObject.create_rectangle(
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self.startx, self.starty, x, y)
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# this flushes the output, making sure that
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# the rectangle makes it to the screen
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# before the next event is handled
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self.update_idletasks()
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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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# this is a "tagOrId" for the rectangle we draw on the canvas
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self.rubberbandBox = None
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# this is the size of the gridding squares
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self.griddingSize = 50
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Widget.bind(self.canvasObject, "<Button-1>", self.mouseDown)
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Widget.bind(self.canvasObject, "<Button1-Motion>", self.mouseMotion)
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test = Test()
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test.mainloop()
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