Page 161 - DCAP408_WEB_PROGRAMMING

Unit 9: Child and Pop Up Windows

8. Using a ......................... window can significantly improve performance and visual effects Notes
for a window that has a complex shape, animates its shape, or wishes to use alpha blending
effects.
9. To set the opacity level or the transparency color key for a given layered window, call
......................... Attributes.

10. A ......................... window enables you to send and receive messages. It is not visible, has
no z-order, cannot be enumerated, and does not receive broadcast messages.
11. To find message-only windows, specify ......................... in the hwndParent parameter of
the FindWindowEx function.

9.3 Fixed Child Windows

[FIXED] Window that opens child Window - Menu displayed behind child

If you have a main Window which opens a child Window and that child Window has a Component
which displays a menu, the menu will appear behind the child Window the first time it is
displayed.
To test, run the code below, click the button, then click the date field trigger. Do not move the
child window in between steps as this will probably alter the child window z-index.
Code:
public static void testPopupBug()
{
final Window w = new Window();
w.setSize(100, 100);

// On button click, display a new window with a simple date field
Button b = new Button(“Open new Window with date field”);
b.addSelectionListener(new SelectionListener<ButtonEvent>() {
public void componentSelected(ButtonEvent ce)
{
final Window popup = new Window();
popup.setSize(150, 150);

final LayoutContainer c = new LayoutContainer();
c.add(new DateField());
popup.add(c);
popup.show();
}
});

w.add(b);

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