| from Tkinter import * |
| |
| # allows moving dots with multiple selection. |
| |
| SELECTED_COLOR = "red" |
| UNSELECTED_COLOR = "blue" |
| |
| class Test(Frame): |
| ################################################################### |
| ###### Event callbacks for THE CANVAS (not the stuff drawn on it) |
| ################################################################### |
| def mouseDown(self, event): |
| # see if we're inside a dot. If we are, it |
| # gets tagged as "current" for free by tk. |
| |
| if not event.widget.find_withtag("current"): |
| # we clicked outside of all dots on the canvas. unselect all. |
| |
| # re-color everything back to an unselected color |
| self.draw.itemconfig("selected", {"fill" : UNSELECTED_COLOR}) |
| # unselect everything |
| self.draw.dtag("selected") |
| else: |
| # mark as "selected" the thing the cursor is under |
| self.draw.addtag("selected", "withtag", "current") |
| # color it as selected |
| self.draw.itemconfig("selected", {"fill": SELECTED_COLOR}) |
| |
| self.lastx = event.x |
| self.lasty = event.y |
| |
| |
| def mouseMove(self, event): |
| self.draw.move("selected", event.x - self.lastx, event.y - self.lasty) |
| self.lastx = event.x |
| self.lasty = event.y |
| |
| def makeNewDot(self): |
| # create a dot, and mark it as current |
| fred = self.draw.create_oval(0, 0, 20, 20, |
| {"fill" : SELECTED_COLOR, "tag" : "current"}) |
| # and make it selected |
| self.draw.addtag("selected", "withtag", "current") |
| |
| def createWidgets(self): |
| self.QUIT = Button(self, {'text': 'QUIT', |
| 'fg': 'red', |
| 'command': self.quit}) |
| |
| ################ |
| # make the canvas and bind some behavior to it |
| ################ |
| self.draw = Canvas(self, {"width" : "5i", "height" : "5i"}) |
| Widget.bind(self.draw, "<1>", self.mouseDown) |
| Widget.bind(self.draw, "<B1-Motion>", self.mouseMove) |
| |
| |
| # and other things..... |
| self.button = Button(self, {"text" : "make a new dot", |
| "command" : self.makeNewDot, |
| "fg" : "blue"}) |
| |
| self.label = Message(self, |
| {"width" : "5i", |
| "text" : SELECTED_COLOR + " dots are selected and can be dragged.\n" + |
| UNSELECTED_COLOR + " are not selected.\n" + |
| "Click in a dot to select it.\n" + |
| "Click on empty space to deselect all dots." }) |
| |
| self.QUIT.pack({'side': 'bottom', 'fill': 'both'}) |
| self.label.pack({"side" : "bottom", "fill" : "x", "expand" : 1}) |
| self.button.pack({"side" : "bottom", "fill" : "x"}) |
| self.draw.pack({'side': 'left'}) |
| |
| |
| def __init__(self, master=None): |
| Frame.__init__(self, master) |
| Pack.config(self) |
| self.createWidgets() |
| |
| test = Test() |
| test.mainloop() |
| |
| |
| |