本文实例讲述了Python tkinter事件高级用法。分享给大家供大家参考,具体如下:
先来看看运行效果:
完整实例代码:
# -*- coding:utf-8-*- #! python3 from tkinter import * import threading,time trace = 0 class CanvasEventsDemo: def __init__(self,parent=None): canvas = Canvas(width=300,height=300,bg='beige') canvas.pack() canvas.bind('<ButtonPress-1>',self.onStart) # click canvas.bind('<B1-Motion>',self.onGrow) # and drag canvas.bind('<Double-1>',self.onClear) # delete all canvas.bind('<ButtonPress-3>',self.onMove) # move latest self.canvas = canvas self.drawn = None self.kinds = [canvas.create_oval,canvas.create_rectangle] def onStart(self,event): self.shape = self.kinds[0] self.kinds = self.kinds[1:] + self.kinds[:1] # start dragout self.start = event self.drawn = None def onGrow(self,event): # delete and redraw canvas = event.widget if self.drawn: canvas.delete(self.drawn) objectId = self.shape(self.start.x,self.start.y,event.x,event.y) if trace: print(objectId) self.drawn = objectId def onClear(self,event): event.widget.delete('all') # use tag all def onMove(self,event): if self.drawn: # move to click spot if trace: print(self.drawn) canvas = event.widget diffX,diffY = (event.x - self.start.x),(event.y - self.start.y) canvas.move(self.drawn,diffX,diffY) self.start = event class CanvasEventsDemoTags(CanvasEventsDemo): def __init__(self,parent=None): CanvasEventsDemo.__init__(self,parent) self.canvas.create_text(100,8,text='Press o and r to move shapes') self.canvas.master.bind('<KeyPress-o>',self.onMoveovals) self.canvas.master.bind('<KeyPress-r>',self.onMoveRectangles) self.kinds = self.create_oval_tagged,self.create_rectangle_tagged def create_oval_tagged(self,x1,y1,x2,y2): objectId = self.canvas.create_oval(x1,y2) self.canvas.itemconfig(objectId,tag='ovals',fill='blue') return objectId def create_rectangle_tagged(self,y2): objectId = self.canvas.create_rectangle(x1,tag='rectangles',fill='red') return objectId def onMoveovals(self,event): print('moving ovals') self.moveInSquares(tag='ovals') # move all tagged ovals def onMoveRectangles(self,event): print('moving rectangles') self.moveInSquares(tag='rectangles') def moveInSquares(self,tag): # 5 reps of 4 times per sec for i in range(5): for (diffx,diffy) in [(+20,0),(0,+20),(-20,-20)]: self.canvas.move(tag,diffx,diffy) self.canvas.update() # force screen redraw/update time.sleep(0.25) # pause,but don't block gui class CanvasEventsDemoThread(CanvasEventsDemoTags): def moveEm(self,tag): for i in range(5): for (diffx,diffy) time.sleep(0.25) # pause this thread only def moveInSquares(self,tag): threading.Thread(self.moveEm,(tag,)).start() if __name__ == '__main__': CanvasEventsDemoThread() mainloop()
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希望本文所述对大家Python程序设计有所帮助。
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