Pmw ScrolledCanvas: add a button

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title = 'Pmw.ScrolledCanvas demonstration'

# Import Pmw from this directory tree.
import sys
sys.path[:0] = ['../../..']

import Tkinter
import Pmw

class Demo:
    def __init__(self, parent):
  # Create the ScrolledCanvas.
  self.sc = Pmw.ScrolledCanvas(parent,
    borderframe = 1,
    labelpos = 'n',
    label_text = 'ScrolledCanvas',
    usehullsize = 1,
    hull_width = 400,
    hull_height = 300,
  )

  # Pack this last so that the buttons do not get shrunk when
  # the window is resized.
  self.sc.pack(padx = 5, pady = 5, fill = 'both', expand = 1)

  self.sc.component('canvas').bind('<1>', self.addcircle)

        testEntry = Tkinter.Entry(parent)
  button = Tkinter.Button(self.sc.interior(),
    text = 'Hello,\nWorld!\nThis\nis\na\nbutton.')
  self.sc.create_window(200, 200,
                anchor='nw',
    window = button)

  # Set the scroll region of the canvas to include all the items
  # just created.
  self.sc.resizescrollregion()

  self.colours = ('red', 'green', 'blue', 'yellow', 'cyan', 'magenta',
    'black', 'white')
  self.oval_count = 0
        self.rand = 12345

    def addcircle(self, event):
  x = self.sc.canvasx(event.x)
  y = self.sc.canvasy(event.y)
  width = 10 + self.random() % 100
  height = 10 + self.random() % 100
  self.sc.create_oval(
      x - width, y - height, x + width, y + height,
      fill = self.colours[self.oval_count])
  self.oval_count = (self.oval_count + 1) % len(self.colours)
  self.sc.resizescrollregion()

    # Simple random number generator.
    def random(self):
        self.rand = (self.rand * 125) % 2796203
        return self.rand


######################################################################

# Create demo in root window for testing.
if __name__ == '__main__':
    root = Tkinter.Tk()
    Pmw.initialise(root)
    root.title(title)

    exitButton = Tkinter.Button(root, text = 'Exit', command = root.destroy)
    exitButton.pack(side = 'bottom')
    widget = Demo(root)
    root.mainloop()
Related examples in the same category

1.	Pmw ScrolledCanvas Demo
2.	Pmw.ScrolledCanvas demonstration: scroll mode
3.	Pmw ScrolledCanvas: line, oval, text
Pmw ScrolledCanvas: add a button : Pmw ScrolledCanvas « GUI Pmw « Python

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