core.com.jgoodies.looks.common.ShadowPopup Maven / Gradle / Ivy
/*
* Copyright (c) 2007 JGoodies Karsten Lentzsch. All Rights Reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* o Redistributions of source code must retain the above copyright notice,
* this list of conditions and the following disclaimer.
*
* o Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* o Neither the name of JGoodies Karsten Lentzsch nor the names of
* its contributors may be used to endorse or promote products derived
* from this software without specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
* THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
* OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
* WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE
* OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE,
* EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
package com.jgoodies.looks.common;
import java.awt.*;
import java.awt.image.BufferedImage;
import java.util.ArrayList;
import java.util.List;
import javax.swing.*;
import javax.swing.border.Border;
/**
* 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.
*
* @author Andrej Golovnin
* @version $Revision: 1.6 $
*
* @see com.jgoodies.looks.common.ShadowPopupBorder
* @see com.jgoodies.looks.common.ShadowPopupFactory
*/
public final class ShadowPopup extends Popup {
/**
* Max number of items to store in the cache.
*/
private static final int MAX_CACHE_SIZE = 5;
/**
* The cache to use for ShadowPopups.
*/
private static List cache;
/**
* The singleton instance used to draw all borders.
*/
private static final Border SHADOW_BORDER = ShadowPopupBorder.getInstance();
/**
* The size of the drop shadow.
*/
private static final int SHADOW_SIZE = 5;
/**
* Indicates whether we can make snapshots from screen or not.
*/
private static boolean canSnapshot = true;
/**
* The component mouse coordinates are relative to, may be null.
*/
private Component owner;
/**
* The contents of the popup.
*/
private Component contents;
/**
* The desired x and y location of the popup.
*/
private int x, y;
/**
* The real popup. The #show() and #hide() methods will delegate
* all calls to these popup.
*/
private Popup popup;
/**
* The border of the contents' parent replaced by SHADOW_BORDER.
*/
private Border oldBorder;
/**
* The old value of the opaque property of the contents' parent.
*/
private boolean oldOpaque;
/**
* The heavy weight container of the popup contents, may be null.
*/
private Container heavyWeightContainer;
/**
* Returns a previously used ShadowPopup, or a new one
* if none of the popups have been recycled.
*/
static Popup getInstance(Component owner, Component contents, int x,
int y, Popup delegate) {
ShadowPopup result;
synchronized (ShadowPopup.class) {
if (cache == null) {
cache = new ArrayList(MAX_CACHE_SIZE);
}
if (cache.size() > 0) {
result = (ShadowPopup) cache.remove(0);
} else {
result = new ShadowPopup();
}
}
result.reset(owner, contents, x, y, delegate);
return result;
}
/**
* Recycles the ShadowPopup.
*/
private static void recycle(ShadowPopup popup) {
synchronized (ShadowPopup.class) {
if (cache.size() < MAX_CACHE_SIZE) {
cache.add(popup);
}
}
}
public static boolean canSnapshot() {
return canSnapshot;
}
/**
* 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.
*/
public void hide() {
if (contents == null)
return;
JComponent parent = (JComponent) contents.getParent();
popup.hide();
if ((parent != null) && parent.getBorder() == SHADOW_BORDER) {
parent.setBorder(oldBorder);
parent.setOpaque(oldOpaque);
oldBorder = null;
if (heavyWeightContainer != null) {
parent.putClientProperty(ShadowPopupFactory.PROP_HORIZONTAL_BACKGROUND, null);
parent.putClientProperty(ShadowPopupFactory.PROP_VERTICAL_BACKGROUND, null);
heavyWeightContainer = null;
}
}
owner = null;
contents = null;
popup = null;
recycle(this);
}
/**
* 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.
*/
public void show() {
if (heavyWeightContainer != null) {
snapshot();
}
popup.show();
}
/**
* Reinitializes this ShadowPopup using the given parameters.
*
* @param owner component mouse coordinates are relative to, may be null
* @param contents the contents of the popup
* @param x the desired x location of the popup
* @param y the desired y location of the popup
* @param popup the popup to wrap
*/
private void reset(Component owner, Component contents, int x, int y,
Popup popup) {
this.owner = owner;
this.contents = contents;
this.popup = popup;
this.x = x;
this.y = y;
if (owner instanceof JComboBox) {
return;
}
// Do not install the shadow border when the contents
// has a preferred size less than or equal to 0.
// We can't use the size, because it is(0, 0) for new popups.
Dimension contentsPrefSize = contents.getPreferredSize();
if ((contentsPrefSize.width <= 0) || (contentsPrefSize.height <= 0)) {
return;
}
for(Container p = contents.getParent(); p != null; p = p.getParent()) {
if ((p instanceof JWindow) || (p instanceof Panel)) {
// Workaround for the gray rect problem.
p.setBackground(contents.getBackground());
heavyWeightContainer = p;
break;
}
}
JComponent parent = (JComponent) contents.getParent();
oldOpaque = parent.isOpaque();
oldBorder = parent.getBorder();
parent.setOpaque(false);
parent.setBorder(SHADOW_BORDER);
// Pack it because we have changed the border.
if (heavyWeightContainer != null) {
heavyWeightContainer.setSize(
heavyWeightContainer.getPreferredSize());
} else {
parent.setSize(parent.getPreferredSize());
}
}
/**
* The 'scratch pad' objects used to calculate dirty regions of
* the screen snapshots.
*
* @see #snapshot()
*/
private static final Point POINT = new Point();
private static final Rectangle RECT = new Rectangle();
/**
* 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 #show()
* @see com.jgoodies.looks.common.ShadowPopupBorder
* @see Robot#createScreenCapture(Rectangle)
*/
private void snapshot() {
try {
Dimension size = heavyWeightContainer.getPreferredSize();
int width = size.width;
int height = size.height;
// Avoid unnecessary and illegal screen captures
// for degenerated popups.
if ((width <= 0) || (height <= SHADOW_SIZE)) {
return;
}
Robot robot = new Robot(); // uses the default screen device
RECT.setBounds(x, y + height - SHADOW_SIZE, width, SHADOW_SIZE);
BufferedImage hShadowBg = robot.createScreenCapture(RECT);
RECT.setBounds(x + width - SHADOW_SIZE, y, SHADOW_SIZE,
height - SHADOW_SIZE);
BufferedImage vShadowBg = robot.createScreenCapture(RECT);
JComponent parent = (JComponent) contents.getParent();
parent.putClientProperty(ShadowPopupFactory.PROP_HORIZONTAL_BACKGROUND, hShadowBg);
parent.putClientProperty(ShadowPopupFactory.PROP_VERTICAL_BACKGROUND, vShadowBg);
Container layeredPane = getLayeredPane();
if (layeredPane == null) {
// This could happen if owner is null.
return;
}
int layeredPaneWidth = layeredPane.getWidth();
int layeredPaneHeight = layeredPane.getHeight();
POINT.x = x;
POINT.y = y;
SwingUtilities.convertPointFromScreen(POINT, layeredPane);
// If needed paint dirty region of the horizontal snapshot.
RECT.x = POINT.x;
RECT.y = POINT.y + height - SHADOW_SIZE;
RECT.width = width;
RECT.height = SHADOW_SIZE;
if ((RECT.x + RECT.width) > layeredPaneWidth) {
RECT.width = layeredPaneWidth - RECT.x;
}
if ((RECT.y + RECT.height) > layeredPaneHeight) {
RECT.height = layeredPaneHeight - RECT.y;
}
if (!RECT.isEmpty()) {
Graphics g = hShadowBg.createGraphics();
g.translate(-RECT.x, -RECT.y);
g.setClip(RECT);
if (layeredPane instanceof JComponent) {
JComponent c = (JComponent) layeredPane;
boolean doubleBuffered = c.isDoubleBuffered();
c.setDoubleBuffered(false);
c.paintAll(g);
c.setDoubleBuffered(doubleBuffered);
} else {
layeredPane.paintAll(g);
}
g.dispose();
}
// If needed paint dirty region of the vertical snapshot.
RECT.x = POINT.x + width - SHADOW_SIZE;
RECT.y = POINT.y;
RECT.width = SHADOW_SIZE;
RECT.height = height - SHADOW_SIZE;
if ((RECT.x + RECT.width) > layeredPaneWidth) {
RECT.width = layeredPaneWidth - RECT.x;
}
if ((RECT.y + RECT.height) > layeredPaneHeight) {
RECT.height = layeredPaneHeight - RECT.y;
}
if (!RECT.isEmpty()) {
Graphics g = vShadowBg.createGraphics();
g.translate(-RECT.x, -RECT.y);
g.setClip(RECT);
if (layeredPane instanceof JComponent) {
JComponent c = (JComponent) layeredPane;
boolean doubleBuffered = c.isDoubleBuffered();
c.setDoubleBuffered(false);
c.paintAll(g);
c.setDoubleBuffered(doubleBuffered);
} else {
layeredPane.paintAll(g);
}
g.dispose();
}
} catch (AWTException e) {
canSnapshot = false;
} catch (SecurityException e) {
canSnapshot = false;
}
}
/**
* @return the top level layered pane which contains the owner.
*/
private Container getLayeredPane() {
// The code below is copied from PopupFactory#LightWeightPopup#show()
Container parent = null;
if (owner != null) {
parent = owner instanceof Container
? (Container) owner
: owner.getParent();
}
// Try to find a JLayeredPane and Window to add
for (Container p = parent; p != null; p = p.getParent()) {
if (p instanceof JRootPane) {
if (p.getParent() instanceof JInternalFrame) {
continue;
}
parent = ((JRootPane) p).getLayeredPane();
// Continue, so that if there is a higher JRootPane, we'll
// pick it up.
} else if (p instanceof Window) {
if (parent == null) {
parent = p;
}
break;
} else if (p instanceof JApplet) {
// Painting code stops at Applets, we don't want
// to add to a Component above an Applet otherwise
// you'll never see it painted.
break;
}
}
return parent;
}
}