Module java.desktop

Package javax.swing

Class Popup

java.lang.Object

javax.swing.Popup

public class Popup
extends Object

Popups are used to display a Component to the user, typically on top of all the other Components in a particular containment hierarchy. Popups have a very small life cycle. Once you have obtained a Popup, and hidden it (invoked the hide method), you should no longer invoke any methods on it. This allows the PopupFactory to cache Popups for later use.

The general contract is that if you need to change the size of the Component, or location of the Popup, you should obtain a new Popup.

Popup does not descend from Component, rather implementations of Popup are responsible for creating and maintaining their own Components to render the requested Component to the user.

You typically do not explicitly create an instance of Popup, instead obtain one from a PopupFactory.

Since:

1.4

See Also:

• PopupFactory

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	Popup()	Creates a Popup.
protected	Popup(Component owner, Component contents, int x, int y)	Creates a Popup for the Component owner containing the Component contents.

Method Summary

Modifier and Type	Method	Description
void	hide()	Hides and disposes of the Popup.
void	show()	Makes the Popup visible.

Methods declared in class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

Popup

protected Popup(Component owner,
 Component contents,
 int x,
 int y)

Creates a Popup for the Component owner containing the Component contents. owner is used to determine which Window the new Popup will parent the Component the Popup creates to. A null owner implies there is no valid parent. x and y specify the preferred initial location to place the Popup at. Based on screen size, or other parameters, the Popup may not display at x and y.

Parameters:

owner - Component mouse coordinates are relative to, may be null

contents - Contents of the Popup

x - Initial x screen coordinate

y - Initial y screen coordinate

Throws:

IllegalArgumentException - if contents is null

Popup

protected Popup()

Creates a Popup. This is provided for subclasses.

Method Details

show

public void show()

Makes the Popup visible. If the Popup is currently visible, this has no effect.

hide

public void hide()

Hides and disposes of the Popup. Once a Popup has been disposed you should no longer invoke methods on it. A disposed Popup may be reclaimed and later used based on the PopupFactory. As such, if you invoke methods on a disposed Popup, indeterminate behavior will result.