mirror of https://github.com/python/cpython
86 lines
2.6 KiB
Python
86 lines
2.6 KiB
Python
|
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()
|
||
|
|
|
||
|
|
|
||
|
|
|