PyGTK - Layout Class

The gtk.Layout is a container widget similar to gtk.Fixed. Widgets are placed in Layout widget by specifying absolute coordinates. However, the Layout differs from fixed widget in the following ways −

The layout widget can have infinite width and height. The maximum value of width and height is pmited by the size of unsigned integer.

A gtk.DrawingArea widget can be enclosed in a layout container. The DrawingArea is a canvas on which 2D elements pke pne, rectangle etc. can be drawn.

In order to put the Layout container in the toplevel window of lesser dimensions, it can be associated with the scrollbars or can be placed in a ScrolledWindow.

The gtk.Layout class has the following constructor −

gtk.Layout(hadjustment = None, vadjustment = None)

The hadjustment and vadjustment properties represent an object having an adjustable bounded value.

The following table psts out the frequently used methods of the layout −

The Layout object emits the set_scroll_adjustment signal when the adjustments associated with it are changed.

Example

In the following example, a Label is paced at the centre of a Layout container, which in turn is to be placed in a toplevel window of smaller size. Hence, it is first added to a ScrolledWindow and the ScrolledWindow is then added to the main window.

Observe the code −

import gtk

class PyApp(gtk.Window):
   
   def __init__(self):
      super(PyApp, self).__init__()
      self.set_title("layout")
      self.set_size_request(300,200)
      self.set_position(gtk.WIN_POS_CENTER)
      sc = gtk.ScrolledWindow()
      lo = gtk.Layout()
      lo.set_size(400,400)
      button = gtk.Button("Press Me")
      lo.put(button, 125,200)
      sc.add(lo)
      self.add(sc)
      self.connect("destroy", gtk.main_quit)
      self.show_all()

PyApp()
gtk.main()

The above code will generate the following output −