/Demo/tkinter/matt/canvas-moving-w-mouse.py
http://unladen-swallow.googlecode.com/ · Python · 55 lines · 31 code · 11 blank · 13 comment · 0 complexity · 1d7e5aa626fbe11ee292e410e989a196 MD5 · raw file
- from Tkinter import *
- # this file demonstrates the movement of a single canvas item under mouse control
- class Test(Frame):
- ###################################################################
- ###### Event callbacks for THE CANVAS (not the stuff drawn on it)
- ###################################################################
- def mouseDown(self, event):
- # remember where the mouse went down
- self.lastx = event.x
- self.lasty = event.y
- def mouseMove(self, event):
- # whatever the mouse is over gets tagged as CURRENT for free by tk.
- self.draw.move(CURRENT, event.x - self.lastx, event.y - self.lasty)
- self.lastx = event.x
- self.lasty = event.y
- ###################################################################
- ###### Event callbacks for canvas ITEMS (stuff drawn on the canvas)
- ###################################################################
- def mouseEnter(self, event):
- # the CURRENT tag is applied to the object the cursor is over.
- # this happens automatically.
- self.draw.itemconfig(CURRENT, fill="red")
- def mouseLeave(self, event):
- # the CURRENT tag is applied to the object the cursor is over.
- # this happens automatically.
- self.draw.itemconfig(CURRENT, fill="blue")
- def createWidgets(self):
- self.QUIT = Button(self, text='QUIT', foreground='red',
- command=self.quit)
- self.QUIT.pack(side=LEFT, fill=BOTH)
- self.draw = Canvas(self, width="5i", height="5i")
- self.draw.pack(side=LEFT)
- fred = self.draw.create_oval(0, 0, 20, 20,
- fill="green", tags="selected")
- self.draw.tag_bind(fred, "<Any-Enter>", self.mouseEnter)
- self.draw.tag_bind(fred, "<Any-Leave>", self.mouseLeave)
- Widget.bind(self.draw, "<1>", self.mouseDown)
- Widget.bind(self.draw, "<B1-Motion>", self.mouseMove)
- def __init__(self, master=None):
- Frame.__init__(self, master)
- Pack.config(self)
- self.createWidgets()
- test = Test()
- test.mainloop()