Package com.jgoodies.looks.common

Class ShadowPopup

java.lang.Object

javax.swing.Popup

com.jgoodies.looks.common.ShadowPopup

public final class ShadowPopup
extends Popup

Does all the magic for getting popups with drop shadows. It adds the drop shadow border to the Popup, in #show it snapshots the screen background as needed, and in #hide it cleans up all changes made before.

Version:

$Revision: 1.12 $

See Also:

• ShadowPopupBorder
• ShadowPopupFactory

Field Summary

Fields

Modifier and Type	Field	Description
private static List<ShadowPopup>	cache	The cache to use for ShadowPopups.
private static boolean	canSnapshot	Indicates whether we can make snapshots from screen or not.
private Component	contents	The contents of the popup.
private Container	heavyWeightContainer	The heavy weight container of the popup contents, may be null.
private static final int	MAX_CACHE_SIZE	Max number of items to store in the cache.
private Border	oldBorder	The border of the contents' parent replaced by SHADOW_BORDER.
private boolean	oldOpaque	The old value of the opaque property of the contents' parent.
private Component	owner	The component mouse coordinates are relative to, may be null.
private static final Point	POINT	The 'scratch pad' objects used to calculate dirty regions of the screen snapshots.
private Popup	popup	The real popup.
private static final Rectangle	RECT
private static final Border	SHADOW_BORDER	The singleton instance used to draw all borders.
private static final int	SHADOW_SIZE	The size of the drop shadow.
private int	x	The desired x and y location of the popup.
private int	y	The desired x and y location of the popup.

Constructor Summary

Constructors

Constructor	Description
ShadowPopup()

Method Summary

Modifier and Type	Method	Description
static boolean	canSnapshot()
(package private) static Popup	getInstance(Component owner, Component contents, int x, int y, Popup delegate)	Returns a previously used ShadowPopup, or a new one if none of the popups have been recycled.
private Container	getLayeredPane()
void	hide()	Hides and disposes of the Popup.
private static void	recycle(ShadowPopup popup)	Recycles the ShadowPopup.
private void	reset(Component owner, Component contents, int x, int y, Popup popup)	Reinitializes this ShadowPopup using the given parameters.
void	show()	Makes the Popup visible.
private void	snapshot()	Snapshots the background.

Methods inherited from class java.lang.Object

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

Field Details

MAX_CACHE_SIZE

private static final int MAX_CACHE_SIZE

Max number of items to store in the cache.

See Also:

• Constant Field Values

cache

private static List<ShadowPopup> cache

The cache to use for ShadowPopups.

SHADOW_BORDER

private static final Border SHADOW_BORDER

The singleton instance used to draw all borders.

SHADOW_SIZE

private static final int SHADOW_SIZE

The size of the drop shadow.

See Also:

• Constant Field Values

canSnapshot

private static boolean canSnapshot

Indicates whether we can make snapshots from screen or not.

owner

private Component owner

The component mouse coordinates are relative to, may be null.

contents

private Component contents

The contents of the popup.

x

private int x

The desired x and y location of the popup.

y

private int y

The desired x and y location of the popup.

popup

private Popup popup

The real popup. The #show() and #hide() methods will delegate all calls to these popup.

oldBorder

private Border oldBorder

The border of the contents' parent replaced by SHADOW_BORDER.

oldOpaque

private boolean oldOpaque

The old value of the opaque property of the contents' parent.

heavyWeightContainer

private Container heavyWeightContainer

The heavy weight container of the popup contents, may be null.

POINT

private static final Point POINT

The 'scratch pad' objects used to calculate dirty regions of the screen snapshots.

See Also:

• snapshot()

RECT

private static final Rectangle RECT

Constructor Details

ShadowPopup

public ShadowPopup()

Method Details

getInstance

static Popup getInstance(Component owner,
 Component contents,
 int x,
 int y,
 Popup delegate)

Returns a previously used ShadowPopup, or a new one if none of the popups have been recycled.

recycle

private static void recycle(ShadowPopup popup)

Recycles the ShadowPopup.

canSnapshot

public static boolean canSnapshot()

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.

In addition to the superclass behavior, we reset the stored horizontal and vertical drop shadows - if any.

Overrides:

hide in class Popup

show

public void show()

Makes the Popup visible. If the popup has a heavy-weight container, we try to snapshot the background. If the Popup is currently visible, it remains visible.

Overrides:

show in class Popup

reset

private void reset(Component owner,
 Component contents,
 int x,
 int y,
 Popup popup)

Reinitializes this ShadowPopup using the given parameters.

Parameters:

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

contents - the contents of the popup

x - the desired x location of the popup

y - the desired y location of the popup

popup - the popup to wrap

snapshot

private void snapshot()

Snapshots the background. The snapshots are stored as client properties of the contents' parent. The next time the border is drawn, this background will be used.

Uses a robot on the default screen device to capture the screen region under the drop shadow. Does not use the window's device, because that may be an outdated device (due to popup reuse) and the robot's origin seems to be adjusted with the default screen device.

See Also:

• show()
• ShadowPopupBorder
• Robot.createScreenCapture(Rectangle)

getLayeredPane

private Container getLayeredPane()

Returns:

the top level layered pane which contains the owner.