| 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() |
