In AIR desktop applications, consider using
an opaque rectangular application window instead of a transparent
window.
To use an opaque window for the initial window of an AIR desktop
application, set the following value in the application descriptor
XML file:
<initialWindow>
<transparent>false</transparent>
</initialWindow>
For windows created by application code, create a NativeWindowInitOptions object
with the
transparent
property set to
false
(the
default). Pass it to the NativeWindow constructor while creating
the NativeWindow object:
// NativeWindow: flash.display.NativeWindow class
var initOptions:NativeWindowInitOptions = new NativeWindowInitOptions();
initOptions.transparent = false;
var win:NativeWindow = new NativeWindow(initOptions);
For a Flex Window component, make sure the component’s transparent
property is set to false, the default, before calling the Window
object’s
open()
method.
// Flex window component: spark.components.Window class
var win:Window = new Window();
win.transparent = false;
win.open();
A transparent window potentially shows part of the user’s desktop
or other application windows behind the application window. Consequently,
the runtime uses more resources to render a transparent window.
A rectangular non-transparent window, whether it uses operating
system chrome or custom chrome, does not have the same rendering
burden.
Only use a transparent window when it is important to have a
non-rectangular display or to have background content display through
your application window.
