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 limited 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 like line, 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 lists out the frequently used methods of the layout −
|put(widget, x, y)||Places a child widget at the specified coordinates|
|set_size(w, h)||Sets the size of the Layout container to the specified width and height|
The Layout object emits the set_scroll_adjustment signal when the adjustments associated with it are changed.
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 −