public class Popup extends Object
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.
PopupFactory| Modifier | Constructor and 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. |
| Modifier and Type | Method and Description |
|---|---|
void |
hide()
Hides and disposes of the
Popup. |
void |
show()
Makes the
Popup visible. |
protected Popup(Component owner, Component contents, int x, int y)
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 paramaters,
the Popup may not display at x and
y.owner - Component mouse coordinates are relative to, may be nullcontents - Contents of the Popupx - Initial x screen coordinatey - Initial y screen coordinateIllegalArgumentException - if contents is nullprotected Popup()
Popup. This is provided for subclasses.public void show()
Popup visible. If the Popup is
currently visible, this has no effect.public void hide()
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. Submit a bug or feature
For further API reference and developer documentation, see Java SE Documentation. That documentation contains more detailed, developer-targeted descriptions, with conceptual overviews, definitions of terms, workarounds, and working code examples.
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