9.2. Arrows

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9.2. Arrows
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The Arrow widget draws an arrowhead, facing in a number of possible directions and having a number of possible styles. It can be very useful when placed on a button in many applications. Like the Label widget, it emits no signals.

There are only two calls for manipulating an Arrow widget:

  arrow = gtk.Arrow(arrow_type, shadow_type)

  arrow.set(arrow_type, shadow_type)

The first creates a new arrow widget with the indicated type and appearance. The second allows these values to be altered retrospectively. The arrow_type argument may take one of the following values:

  ARROW_UP
  ARROW_DOWN
  ARROW_LEFT
  ARROW_RIGHT

These values obviously indicate the direction in which the arrow will point. The shadow_type argument may take one of these values:

  SHADOW_IN
  SHADOW_OUT   # the default
  SHADOW_ETCHED_IN
  SHADOW_ETCHED_OUT

The arrow.py example program briefly illustrates their use. Figure 9.2, “Arrows Buttons Examples” illustrates the result of running the program:

Figure 9.2. Arrows Buttons Examples

The source code for arrow.py is:

    1	#!/usr/bin/env python
    2	
    3	# example arrow.py
    4	
    5	import pygtk
    6	pygtk.require('2.0')
    7	import gtk
    8	
    9	# Create an Arrow widget with the specified parameters
   10	# and pack it into a button
   11	def create_arrow_button(arrow_type, shadow_type):
   12	    button = gtk.Button();
   13	    arrow = gtk.Arrow(arrow_type, shadow_type);
   14	    button.add(arrow)
   15	    button.show()
   16	    arrow.show()
   17	    return button
   18	
   19	class Arrows:
   20	    def __init__(self):
   21	        # Create a new window
   22	        window = gtk.Window(gtk.WINDOW_TOPLEVEL)
   23	
   24	        window.set_title("Arrow Buttons")
   25	
   26	        # It's a good idea to do this for all windows.
   27	        window.connect("destroy", lambda x: gtk.main_quit())
   28	
   29	        # Sets the border width of the window.
   30	        window.set_border_width(10)
   31	
   32	        # Create a box to hold the arrows/buttons
   33	        box = gtk.HBox(False, 0)
   34	        box.set_border_width(2)
   35	        window.add(box)
   36	
   37	        # Pack and show all our widgets
   38	        box.show()
   39	
   40	        button = create_arrow_button(gtk.ARROW_UP, gtk.SHADOW_IN)
   41	        box.pack_start(button, False, False, 3)
   42	
   43	        button = create_arrow_button(gtk.ARROW_DOWN, gtk.SHADOW_OUT)
   44	        box.pack_start(button, False, False, 3)
   45	  
   46	        button = create_arrow_button(gtk.ARROW_LEFT, gtk.SHADOW_ETCHED_IN)
   47	        box.pack_start(button, False, False, 3)
   48	  
   49	        button = create_arrow_button(gtk.ARROW_RIGHT, gtk.SHADOW_ETCHED_OUT)
   50	        box.pack_start(button, False, False, 3)
   51	  
   52	        window.show()
   53	
   54	def main():
   55	    gtk.main()
   56	    return 0
   57	
   58	if __name__ == "__main__":
   59	    Arrows()
   60	    main()

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Chapter 9. Miscellaneous Widgets	Home	9.3. The Tooltips Object