Demo/tkinter/matt/canvas-with-scrollbars.py

   1 from Tkinter import *
   2
   3 # This example program creates a scroling canvas, and demonstrates
   4 # how to tie scrollbars and canvses together. The mechanism
   5 # is analogus for listboxes and other widgets with
   6 # "xscroll" and "yscroll" configuration options.
   7
   8 class Test(Frame):
   9     def printit(self):
  10         print "hi"
  11
  12     def createWidgets(self):
  13         self.question = Label(self, {"text":  "Can Find The BLUE Square??????",
  14                                      Pack : {"side" : "top"}})
  15
  16         self.QUIT = Button(self, {'text': 'QUIT',
  17                                   'bg': 'red',
  18                                   "height" : "3",
  19                                   'command': self.quit})
  20         self.QUIT.pack({'side': 'bottom', 'fill': 'both'})
  21         spacer = Frame(self, {"height" : "0.25i",
  22                               Pack : {"side" : "bottom"}})
  23
  24         # notice that the scroll region (20" x 20") is larger than
  25         # displayed size of the widget (5" x 5")
  26         self.draw = Canvas(self, {"width" : "5i",
  27                                   "height" : "5i",
  28                                   "bg" : "white",
  29                                   "scrollregion" : "0i 0i 20i 20i"})
  30
  31
  32         self.draw.scrollX = Scrollbar(self, {"orient" : "horizontal"})
  33         self.draw.scrollY = Scrollbar(self, {"orient" : "vertical"})
  34
  35         # now tie the three together. This is standard boilerplate text
  36         self.draw['xscroll'] = self.draw.scrollX.set
  37         self.draw['yscroll'] = self.draw.scrollY.set
  38         self.draw.scrollX['command'] = self.draw.xview
  39         self.draw.scrollY['command'] = self.draw.yview
  40
  41         # draw something. Note that the first square
  42         # is visible, but you need to scroll to see the second one.
  43         self.draw.create_polygon("0i", "0i", "3.5i", "0i", "3.5i", "3.5i", "0i" , "3.5i")
  44         self.draw.create_polygon("10i", "10i", "13.5i", "10i", "13.5i", "13.5i", "10i" , "13.5i", "-fill", "blue")
  45
  46
  47         # pack 'em up
  48         self.draw.scrollX.pack({'side': 'bottom',
  49                                 "fill" : "x"})
  50         self.draw.scrollY.pack({'side': 'right',
  51                                 "fill" : "y"})
  52         self.draw.pack({'side': 'left'})
  53
  54
  55     def scrollCanvasX(self, *args):
  56         print "scrolling", args
  57         print self.draw.scrollX.get()
  58
  59
  60     def __init__(self, master=None):
  61         Frame.__init__(self, master)
  62         Pack.config(self)
  63         self.createWidgets()
  64
  65 test = Test()
  66
  67 test.mainloop()