JDK8/Java8源码在线阅读
/*
* Copyright (c) 1997, 2013, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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*/
package javax.swing;
import sun.reflect.misc.ReflectUtil;
import sun.swing.SwingUtilities2;
import sun.swing.UIAction;
import java.applet.*;
import java.awt.*;
import java.awt.event.*;
import java.awt.dnd.DropTarget;
import java.lang.reflect.*;
import javax.accessibility.*;
import javax.swing.event.MenuDragMouseEvent;
import javax.swing.plaf.UIResource;
import javax.swing.text.View;
import java.security.AccessController;
import sun.security.action.GetPropertyAction;
import sun.awt.AppContext;
/**
* A collection of utility methods for Swing.
*
* @author unknown
*/
public class SwingUtilities implements SwingConstants
{
// These states are system-wide, rather than AppContext wide.
private static boolean canAccessEventQueue = false;
private static boolean eventQueueTested = false;
/**
* Indicates if we should change the drop target when a
* {@code TransferHandler} is set.
*/
private static boolean suppressDropSupport;
/**
* Indiciates if we've checked the system property for suppressing
* drop support.
*/
private static boolean checkedSuppressDropSupport;
/**
* Returns true if <code>setTransferHandler</code> should change the
* <code>DropTarget</code>.
*/
private static boolean getSuppressDropTarget() {
if (!checkedSuppressDropSupport) {
suppressDropSupport = Boolean.valueOf(
AccessController.doPrivileged(
new GetPropertyAction("suppressSwingDropSupport")));
checkedSuppressDropSupport = true;
}
return suppressDropSupport;
}
/**
* Installs a {@code DropTarget} on the component as necessary for a
* {@code TransferHandler} change.
*/
static void installSwingDropTargetAsNecessary(Component c,
TransferHandler t) {
if (!getSuppressDropTarget()) {
DropTarget dropHandler = c.getDropTarget();
if ((dropHandler == null) || (dropHandler instanceof UIResource)) {
if (t == null) {
c.setDropTarget(null);
} else if (!GraphicsEnvironment.isHeadless()) {
c.setDropTarget(new TransferHandler.SwingDropTarget(c));
}
}
}
}
/**
* Return true if <code>a</code> contains <code>b</code>
*/
public static final boolean isRectangleContainingRectangle(Rectangle a,Rectangle b) {
return b.x >= a.x && (b.x + b.width) <= (a.x + a.width) &&
b.y >= a.y && (b.y + b.height) <= (a.y + a.height);
}
/**
* Return the rectangle (0,0,bounds.width,bounds.height) for the component <code>aComponent</code>
*/
public static Rectangle getLocalBounds(Component aComponent) {
Rectangle b = new Rectangle(aComponent.getBounds());
b.x = b.y = 0;
return b;
}
/**
* Returns the first <code>Window </code> ancestor of <code>c</code>, or
* {@code null} if <code>c</code> is not contained inside a <code>Window</code>.
*
* @param c <code>Component</code> to get <code>Window</code> ancestor
* of.
* @return the first <code>Window </code> ancestor of <code>c</code>, or
* {@code null} if <code>c</code> is not contained inside a
* <code>Window</code>.
* @since 1.3
*/
public static Window getWindowAncestor(Component c) {
for(Container p = c.getParent(); p != null; p = p.getParent()) {
if (p instanceof Window) {
return (Window)p;
}
}
return null;
}
/**
* Converts the location <code>x</code> <code>y</code> to the
* parents coordinate system, returning the location.
*/
static Point convertScreenLocationToParent(Container parent,int x, int y) {
for (Container p = parent; p != null; p = p.getParent()) {
if (p instanceof Window) {
Point point = new Point(x, y);
SwingUtilities.convertPointFromScreen(point, parent);
return point;
}
}
throw new Error("convertScreenLocationToParent: no window ancestor");
}
/**
* Convert a <code>aPoint</code> in <code>source</code> coordinate system to
* <code>destination</code> coordinate system.
* If <code>source</code> is {@code null}, <code>aPoint</code> is assumed to be in <code>destination</code>'s
* root component coordinate system.
* If <code>destination</code> is {@code null}, <code>aPoint</code> will be converted to <code>source</code>'s
* root component coordinate system.
* If both <code>source</code> and <code>destination</code> are {@code null}, return <code>aPoint</code>
* without any conversion.
*/
public static Point convertPoint(Component source,Point aPoint,Component destination) {
Point p;
if(source == null && destination == null)
return aPoint;
if(source == null) {
source = getWindowAncestor(destination);
if(source == null)
throw new Error("Source component not connected to component tree hierarchy");
}
p = new Point(aPoint);
convertPointToScreen(p,source);
if(destination == null) {
destination = getWindowAncestor(source);
if(destination == null)
throw new Error("Destination component not connected to component tree hierarchy");
}
convertPointFromScreen(p,destination);
return p;
}
/**
* Convert the point <code>(x,y)</code> in <code>source</code> coordinate system to
* <code>destination</code> coordinate system.
* If <code>source</code> is {@code null}, <code>(x,y)</code> is assumed to be in <code>destination</code>'s
* root component coordinate system.
* If <code>destination</code> is {@code null}, <code>(x,y)</code> will be converted to <code>source</code>'s
* root component coordinate system.
* If both <code>source</code> and <code>destination</code> are {@code null}, return <code>(x,y)</code>
* without any conversion.
*/
public static Point convertPoint(Component source,int x, int y,Component destination) {
Point point = new Point(x,y);
return convertPoint(source,point,destination);
}
/**
* Convert the rectangle <code>aRectangle</code> in <code>source</code> coordinate system to
* <code>destination</code> coordinate system.
* If <code>source</code> is {@code null}, <code>aRectangle</code> is assumed to be in <code>destination</code>'s
* root component coordinate system.
* If <code>destination</code> is {@code null}, <code>aRectangle</code> will be converted to <code>source</code>'s
* root component coordinate system.
* If both <code>source</code> and <code>destination</code> are {@code null}, return <code>aRectangle</code>
* without any conversion.
*/
public static Rectangle convertRectangle(Component source,Rectangle aRectangle,Component destination) {
Point point = new Point(aRectangle.x,aRectangle.y);
point = convertPoint(source,point,destination);
return new Rectangle(point.x,point.y,aRectangle.width,aRectangle.height);
}
/**
* Convenience method for searching above <code>comp</code> in the
* component hierarchy and returns the first object of class <code>c</code> it
* finds. Can return {@code null}, if a class <code>c</code> cannot be found.
*/
public static Container getAncestorOfClass(Class<?> c, Component comp)
{
if(comp == null || c == null)
return null;
Container parent = comp.getParent();
while(parent != null && !(c.isInstance(parent)))
parent = parent.getParent();
return parent;
}
/**
* Convenience method for searching above <code>comp</code> in the
* component hierarchy and returns the first object of <code>name</code> it
* finds. Can return {@code null}, if <code>name</code> cannot be found.
*/
public static Container getAncestorNamed(String name, Component comp) {
if(comp == null || name == null)
return null;
Container parent = comp.getParent();
while(parent != null && !(name.equals(parent.getName())))
parent = parent.getParent();
return parent;
}
/**
* Returns the deepest visible descendent Component of <code>parent</code>
* that contains the location <code>x</code>, <code>y</code>.
* If <code>parent</code> does not contain the specified location,
* then <code>null</code> is returned. If <code>parent</code> is not a
* container, or none of <code>parent</code>'s visible descendents
* contain the specified location, <code>parent</code> is returned.
*
* @param parent the root component to begin the search
* @param x the x target location
* @param y the y target location
*/
public static Component getDeepestComponentAt(Component parent, int x, int y) {
if (!parent.contains(x, y)) {
return null;
}
if (parent instanceof Container) {
Component components[] = ((Container)parent).getComponents();
for (Component comp : components) {
if (comp != null && comp.isVisible()) {
Point loc = comp.getLocation();
if (comp instanceof Container) {
comp = getDeepestComponentAt(comp, x - loc.x, y - loc.y);
} else {
comp = comp.getComponentAt(x - loc.x, y - loc.y);
}
if (comp != null && comp.isVisible()) {
return comp;
}
}
}
}
return parent;
}
/**
* Returns a MouseEvent similar to <code>sourceEvent</code> except that its x
* and y members have been converted to <code>destination</code>'s coordinate
* system. If <code>source</code> is {@code null}, <code>sourceEvent</code> x and y members
* are assumed to be into <code>destination</code>'s root component coordinate system.
* If <code>destination</code> is <code>null</code>, the
* returned MouseEvent will be in <code>source</code>'s coordinate system.
* <code>sourceEvent</code> will not be changed. A new event is returned.
* the <code>source</code> field of the returned event will be set
* to <code>destination</code> if destination is non-{@code null}
* use the translateMouseEvent() method to translate a mouse event from
* one component to another without changing the source.
*/
public static MouseEvent convertMouseEvent(Component source,
MouseEvent sourceEvent,
Component destination) {
Point p = convertPoint(source,new Point(sourceEvent.getX(),
sourceEvent.getY()),
destination);
Component newSource;
if(destination != null)
newSource = destination;
else
newSource = source;
MouseEvent newEvent;
if (sourceEvent instanceof MouseWheelEvent) {
MouseWheelEvent sourceWheelEvent = (MouseWheelEvent)sourceEvent;
newEvent = new MouseWheelEvent(newSource,
sourceWheelEvent.getID(),
sourceWheelEvent.getWhen(),
sourceWheelEvent.getModifiers()
| sourceWheelEvent.getModifiersEx(),
p.x,p.y,
sourceWheelEvent.getXOnScreen(),
sourceWheelEvent.getYOnScreen(),
sourceWheelEvent.getClickCount(),
sourceWheelEvent.isPopupTrigger(),
sourceWheelEvent.getScrollType(),
sourceWheelEvent.getScrollAmount(),
sourceWheelEvent.getWheelRotation());
}
else if (sourceEvent instanceof MenuDragMouseEvent) {
MenuDragMouseEvent sourceMenuDragEvent = (MenuDragMouseEvent)sourceEvent;
newEvent = new MenuDragMouseEvent(newSource,
sourceMenuDragEvent.getID(),
sourceMenuDragEvent.getWhen(),
sourceMenuDragEvent.getModifiers()
| sourceMenuDragEvent.getModifiersEx(),
p.x,p.y,
sourceMenuDragEvent.getXOnScreen(),
sourceMenuDragEvent.getYOnScreen(),
sourceMenuDragEvent.getClickCount(),
sourceMenuDragEvent.isPopupTrigger(),
sourceMenuDragEvent.getPath(),
sourceMenuDragEvent.getMenuSelectionManager());
}
else {
newEvent = new MouseEvent(newSource,
sourceEvent.getID(),
sourceEvent.getWhen(),
sourceEvent.getModifiers()
| sourceEvent.getModifiersEx(),
p.x,p.y,
sourceEvent.getXOnScreen(),
sourceEvent.getYOnScreen(),
sourceEvent.getClickCount(),
sourceEvent.isPopupTrigger(),
sourceEvent.getButton());
}
return newEvent;
}
/**
* Convert a point from a component's coordinate system to
* screen coordinates.
*
* @param p a Point object (converted to the new coordinate system)
* @param c a Component object
*/
public static void convertPointToScreen(Point p,Component c) {
Rectangle b;
int x,y;
do {
if(c instanceof JComponent) {
x = c.getX();
y = c.getY();
} else if(c instanceof java.applet.Applet ||
c instanceof java.awt.Window) {
try {
Point pp = c.getLocationOnScreen();
x = pp.x;
y = pp.y;
} catch (IllegalComponentStateException icse) {
x = c.getX();
y = c.getY();
}
} else {
x = c.getX();
y = c.getY();
}
p.x += x;
p.y += y;
if(c instanceof java.awt.Window || c instanceof java.applet.Applet)
break;
c = c.getParent();
} while(c != null);
}
/**
* Convert a point from a screen coordinates to a component's
* coordinate system
*
* @param p a Point object (converted to the new coordinate system)
* @param c a Component object
*/
public static void convertPointFromScreen(Point p,Component c) {
Rectangle b;
int x,y;
do {
if(c instanceof JComponent) {
x = c.getX();
y = c.getY();
} else if(c instanceof java.applet.Applet ||
c instanceof java.awt.Window) {
try {
Point pp = c.getLocationOnScreen();
x = pp.x;
y = pp.y;
} catch (IllegalComponentStateException icse) {
x = c.getX();
y = c.getY();
}
} else {
x = c.getX();
y = c.getY();
}
p.x -= x;
p.y -= y;
if(c instanceof java.awt.Window || c instanceof java.applet.Applet)
break;
c = c.getParent();
} while(c != null);
}
/**
* Returns the first <code>Window </code> ancestor of <code>c</code>, or
* {@code null} if <code>c</code> is not contained inside a <code>Window</code>.
* <p>
* Note: This method provides the same functionality as
* <code>getWindowAncestor</code>.
*
* @param c <code>Component</code> to get <code>Window</code> ancestor
* of.
* @return the first <code>Window </code> ancestor of <code>c</code>, or
* {@code null} if <code>c</code> is not contained inside a
* <code>Window</code>.
*/
public static Window windowForComponent(Component c) {
return getWindowAncestor(c);
}
/**
* Return <code>true</code> if a component <code>a</code> descends from a component <code>b</code>
*/
public static boolean isDescendingFrom(Component a,Component b) {
if(a == b)
return true;
for(Container p = a.getParent();p!=null;p=p.getParent())
if(p == b)
return true;
return false;
}
/**
* Convenience to calculate the intersection of two rectangles
* without allocating a new rectangle.
* If the two rectangles don't intersect,
* then the returned rectangle begins at (0,0)
* and has zero width and height.
*
* @param x the X coordinate of the first rectangle's top-left point
* @param y the Y coordinate of the first rectangle's top-left point
* @param width the width of the first rectangle
* @param height the height of the first rectangle
* @param dest the second rectangle
*
* @return <code>dest</code>, modified to specify the intersection
*/
public static Rectangle computeIntersection(int x,int y,int width,int height,Rectangle dest) {
int x1 = (x > dest.x) ? x : dest.x;
int x2 = ((x+width) < (dest.x + dest.width)) ? (x+width) : (dest.x + dest.width);
int y1 = (y > dest.y) ? y : dest.y;
int y2 = ((y + height) < (dest.y + dest.height) ? (y+height) : (dest.y + dest.height));
dest.x = x1;
dest.y = y1;
dest.width = x2 - x1;
dest.height = y2 - y1;
// If rectangles don't intersect, return zero'd intersection.
if (dest.width < 0 || dest.height < 0) {
dest.x = dest.y = dest.width = dest.height = 0;
}
return dest;
}
/**
* Convenience method that calculates the union of two rectangles
* without allocating a new rectangle.
*
* @param x the x-coordinate of the first rectangle
* @param y the y-coordinate of the first rectangle
* @param width the width of the first rectangle
* @param height the height of the first rectangle
* @param dest the coordinates of the second rectangle; the union
* of the two rectangles is returned in this rectangle
* @return the <code>dest</code> <code>Rectangle</code>
*/
public static Rectangle computeUnion(int x,int y,int width,int height,Rectangle dest) {
int x1 = (x < dest.x) ? x : dest.x;
int x2 = ((x+width) > (dest.x + dest.width)) ? (x+width) : (dest.x + dest.width);
int y1 = (y < dest.y) ? y : dest.y;
int y2 = ((y+height) > (dest.y + dest.height)) ? (y+height) : (dest.y + dest.height);
dest.x = x1;
dest.y = y1;
dest.width = (x2 - x1);
dest.height= (y2 - y1);
return dest;
}
/**
* Convenience returning an array of rect representing the regions within
* <code>rectA</code> that do not overlap with <code>rectB</code>. If the
* two Rects do not overlap, returns an empty array
*/
public static Rectangle[] computeDifference(Rectangle rectA,Rectangle rectB) {
if (rectB == null || !rectA.intersects(rectB) || isRectangleContainingRectangle(rectB,rectA)) {
return new Rectangle[0];
}
Rectangle t = new Rectangle();
Rectangle a=null,b=null,c=null,d=null;
Rectangle result[];
int rectCount = 0;
/* rectA contains rectB */
if (isRectangleContainingRectangle(rectA,rectB)) {
t.x = rectA.x; t.y = rectA.y; t.width = rectB.x - rectA.x; t.height = rectA.height;
if(t.width > 0 && t.height > 0) {
a = new Rectangle(t);
rectCount++;
}
t.x = rectB.x; t.y = rectA.y; t.width = rectB.width; t.height = rectB.y - rectA.y;
if(t.width > 0 && t.height > 0) {
b = new Rectangle(t);
rectCount++;
}
t.x = rectB.x; t.y = rectB.y + rectB.height; t.width = rectB.width;
t.height = rectA.y + rectA.height - (rectB.y + rectB.height);
if(t.width > 0 && t.height > 0) {
c = new Rectangle(t);
rectCount++;
}
t.x = rectB.x + rectB.width; t.y = rectA.y; t.width = rectA.x + rectA.width - (rectB.x + rectB.width);
t.height = rectA.height;
if(t.width > 0 && t.height > 0) {
d = new Rectangle(t);
rectCount++;
}
} else {
/* 1 */
if (rectB.x <= rectA.x && rectB.y <= rectA.y) {
if ((rectB.x + rectB.width) > (rectA.x + rectA.width)) {
t.x = rectA.x; t.y = rectB.y + rectB.height;
t.width = rectA.width; t.height = rectA.y + rectA.height - (rectB.y + rectB.height);
if(t.width > 0 && t.height > 0) {
a = t;
rectCount++;
}
} else if ((rectB.y + rectB.height) > (rectA.y + rectA.height)) {
t.setBounds((rectB.x + rectB.width), rectA.y,
(rectA.x + rectA.width) - (rectB.x + rectB.width), rectA.height);
if(t.width > 0 && t.height > 0) {
a = t;
rectCount++;
}
} else {
t.setBounds((rectB.x + rectB.width), rectA.y,
(rectA.x + rectA.width) - (rectB.x + rectB.width),
(rectB.y + rectB.height) - rectA.y);
if(t.width > 0 && t.height > 0) {
a = new Rectangle(t);
rectCount++;
}
t.setBounds(rectA.x, (rectB.y + rectB.height), rectA.width,
(rectA.y + rectA.height) - (rectB.y + rectB.height));
if(t.width > 0 && t.height > 0) {
b = new Rectangle(t);
rectCount++;
}
}
} else if (rectB.x <= rectA.x && (rectB.y + rectB.height) >= (rectA.y + rectA.height)) {
if ((rectB.x + rectB.width) > (rectA.x + rectA.width)) {
t.setBounds(rectA.x, rectA.y, rectA.width, rectB.y - rectA.y);
if(t.width > 0 && t.height > 0) {
a = t;
rectCount++;
}
} else {
t.setBounds(rectA.x, rectA.y, rectA.width, rectB.y - rectA.y);
if(t.width > 0 && t.height > 0) {
a = new Rectangle(t);
rectCount++;
}
t.setBounds((rectB.x + rectB.width), rectB.y,
(rectA.x + rectA.width) - (rectB.x + rectB.width),
(rectA.y + rectA.height) - rectB.y);
if(t.width > 0 && t.height > 0) {
b = new Rectangle(t);
rectCount++;
}
}
} else if (rectB.x <= rectA.x) {
if ((rectB.x + rectB.width) >= (rectA.x + rectA.width)) {
t.setBounds(rectA.x, rectA.y, rectA.width, rectB.y - rectA.y);
if(t.width>0 && t.height > 0) {
a = new Rectangle(t);
rectCount++;
}
t.setBounds(rectA.x, (rectB.y + rectB.height), rectA.width,
(rectA.y + rectA.height) - (rectB.y + rectB.height));
if(t.width > 0 && t.height > 0) {
b = new Rectangle(t);
rectCount++;
}
} else {
t.setBounds(rectA.x, rectA.y, rectA.width, rectB.y - rectA.y);
if(t.width > 0 && t.height > 0) {
a = new Rectangle(t);
rectCount++;
}
t.setBounds((rectB.x + rectB.width), rectB.y,
(rectA.x + rectA.width) - (rectB.x + rectB.width),
rectB.height);
if(t.width > 0 && t.height > 0) {
b = new Rectangle(t);
rectCount++;
}
t.setBounds(rectA.x, (rectB.y + rectB.height), rectA.width,
(rectA.y + rectA.height) - (rectB.y + rectB.height));
if(t.width > 0 && t.height > 0) {
c = new Rectangle(t);
rectCount++;
}
}
} else if (rectB.x <= (rectA.x + rectA.width) && (rectB.x + rectB.width) > (rectA.x + rectA.width)) {
if (rectB.y <= rectA.y && (rectB.y + rectB.height) > (rectA.y + rectA.height)) {
t.setBounds(rectA.x, rectA.y, rectB.x - rectA.x, rectA.height);
if(t.width > 0 && t.height > 0) {
a = t;
rectCount++;
}
} else if (rectB.y <= rectA.y) {
t.setBounds(rectA.x, rectA.y, rectB.x - rectA.x,
(rectB.y + rectB.height) - rectA.y);
if(t.width > 0 && t.height > 0) {
a = new Rectangle(t);
rectCount++;
}
t.setBounds(rectA.x, (rectB.y + rectB.height), rectA.width,
(rectA.y + rectA.height) - (rectB.y + rectB.height));
if(t.width > 0 && t.height > 0) {
b = new Rectangle(t);
rectCount++;
}
} else if ((rectB.y + rectB.height) > (rectA.y + rectA.height)) {
t.setBounds(rectA.x, rectA.y, rectA.width, rectB.y - rectA.y);
if(t.width > 0 && t.height > 0) {
a = new Rectangle(t);
rectCount++;
}
t.setBounds(rectA.x, rectB.y, rectB.x - rectA.x,
(rectA.y + rectA.height) - rectB.y);
if(t.width > 0 && t.height > 0) {
b = new Rectangle(t);
rectCount++;
}
} else {
t.setBounds(rectA.x, rectA.y, rectA.width, rectB.y - rectA.y);
if(t.width > 0 && t.height > 0) {
a = new Rectangle(t);
rectCount++;
}
t.setBounds(rectA.x, rectB.y, rectB.x - rectA.x,
rectB.height);
if(t.width > 0 && t.height > 0) {
b = new Rectangle(t);
rectCount++;
}
t.setBounds(rectA.x, (rectB.y + rectB.height), rectA.width,
(rectA.y + rectA.height) - (rectB.y + rectB.height));
if(t.width > 0 && t.height > 0) {
c = new Rectangle(t);
rectCount++;
}
}
} else if (rectB.x >= rectA.x && (rectB.x + rectB.width) <= (rectA.x + rectA.width)) {
if (rectB.y <= rectA.y && (rectB.y + rectB.height) > (rectA.y + rectA.height)) {
t.setBounds(rectA.x, rectA.y, rectB.x - rectA.x, rectA.height);
if(t.width > 0 && t.height > 0) {
a = new Rectangle(t);
rectCount++;
}
t.setBounds((rectB.x + rectB.width), rectA.y,
(rectA.x + rectA.width) - (rectB.x + rectB.width), rectA.height);
if(t.width > 0 && t.height > 0) {
b = new Rectangle(t);
rectCount++;
}
} else if (rectB.y <= rectA.y) {
t.setBounds(rectA.x, rectA.y, rectB.x - rectA.x, rectA.height);
if(t.width > 0 && t.height > 0) {
a = new Rectangle(t);
rectCount++;
}
t.setBounds(rectB.x, (rectB.y + rectB.height),
rectB.width,
(rectA.y + rectA.height) - (rectB.y + rectB.height));
if(t.width > 0 && t.height > 0) {
b = new Rectangle(t);
rectCount++;
}
t.setBounds((rectB.x + rectB.width), rectA.y,
(rectA.x + rectA.width) - (rectB.x + rectB.width), rectA.height);
if(t.width > 0 && t.height > 0) {
c = new Rectangle(t);
rectCount++;
}
} else {
t.setBounds(rectA.x, rectA.y, rectB.x - rectA.x, rectA.height);
if(t.width > 0 && t.height > 0) {
a = new Rectangle(t);
rectCount++;
}
t.setBounds(rectB.x, rectA.y, rectB.width,
rectB.y - rectA.y);
if(t.width > 0 && t.height > 0) {
b = new Rectangle(t);
rectCount++;
}
t.setBounds((rectB.x + rectB.width), rectA.y,
(rectA.x + rectA.width) - (rectB.x + rectB.width), rectA.height);
if(t.width > 0 && t.height > 0) {
c = new Rectangle(t);
rectCount++;
}
}
}
}
result = new Rectangle[rectCount];
rectCount = 0;
if(a != null)
result[rectCount++] = a;
if(b != null)
result[rectCount++] = b;
if(c != null)
result[rectCount++] = c;
if(d != null)
result[rectCount++] = d;
return result;
}
/**
* Returns true if the mouse event specifies the left mouse button.
*
* @param anEvent a MouseEvent object
* @return true if the left mouse button was active
*/
public static boolean isLeftMouseButton(MouseEvent anEvent) {
return ((anEvent.getModifiersEx() & InputEvent.BUTTON1_DOWN_MASK) != 0 ||
anEvent.getButton() == MouseEvent.BUTTON1);
}
/**
* Returns true if the mouse event specifies the middle mouse button.
*
* @param anEvent a MouseEvent object
* @return true if the middle mouse button was active
*/
public static boolean isMiddleMouseButton(MouseEvent anEvent) {
return ((anEvent.getModifiersEx() & InputEvent.BUTTON2_DOWN_MASK) != 0 ||
anEvent.getButton() == MouseEvent.BUTTON2);
}
/**
* Returns true if the mouse event specifies the right mouse button.
*
* @param anEvent a MouseEvent object
* @return true if the right mouse button was active
*/
public static boolean isRightMouseButton(MouseEvent anEvent) {
return ((anEvent.getModifiersEx() & InputEvent.BUTTON3_DOWN_MASK) != 0 ||
anEvent.getButton() == MouseEvent.BUTTON3);
}
/**
* Compute the width of the string using a font with the specified
* "metrics" (sizes).
*
* @param fm a FontMetrics object to compute with
* @param str the String to compute
* @return an int containing the string width
*/
public static int computeStringWidth(FontMetrics fm,String str) {
// You can't assume that a string's width is the sum of its
// characters' widths in Java2D -- it may be smaller due to
// kerning, etc.
return SwingUtilities2.stringWidth(null, fm, str);
}
/**
* Compute and return the location of the icons origin, the
* location of origin of the text baseline, and a possibly clipped
* version of the compound labels string. Locations are computed
* relative to the viewR rectangle.
* The JComponents orientation (LEADING/TRAILING) will also be taken
* into account and translated into LEFT/RIGHT values accordingly.
*/
public static String layoutCompoundLabel(JComponent c,
FontMetrics fm,
String text,
Icon icon,
int verticalAlignment,
int horizontalAlignment,
int verticalTextPosition,
int horizontalTextPosition,
Rectangle viewR,
Rectangle iconR,
Rectangle textR,
int textIconGap)
{
boolean orientationIsLeftToRight = true;
int hAlign = horizontalAlignment;
int hTextPos = horizontalTextPosition;
if (c != null) {
if (!(c.getComponentOrientation().isLeftToRight())) {
orientationIsLeftToRight = false;
}
}
// Translate LEADING/TRAILING values in horizontalAlignment
// to LEFT/RIGHT values depending on the components orientation
switch (horizontalAlignment) {
case LEADING:
hAlign = (orientationIsLeftToRight) ? LEFT : RIGHT;
break;
case TRAILING:
hAlign = (orientationIsLeftToRight) ? RIGHT : LEFT;
break;
}
// Translate LEADING/TRAILING values in horizontalTextPosition
// to LEFT/RIGHT values depending on the components orientation
switch (horizontalTextPosition) {
case LEADING:
hTextPos = (orientationIsLeftToRight) ? LEFT : RIGHT;
break;
case TRAILING:
hTextPos = (orientationIsLeftToRight) ? RIGHT : LEFT;
break;
}
return layoutCompoundLabelImpl(c,
fm,
text,
icon,
verticalAlignment,
hAlign,
verticalTextPosition,
hTextPos,
viewR,
iconR,
textR,
textIconGap);
}
/**
* Compute and return the location of the icons origin, the
* location of origin of the text baseline, and a possibly clipped
* version of the compound labels string. Locations are computed
* relative to the viewR rectangle.
* This layoutCompoundLabel() does not know how to handle LEADING/TRAILING
* values in horizontalTextPosition (they will default to RIGHT) and in
* horizontalAlignment (they will default to CENTER).
* Use the other version of layoutCompoundLabel() instead.
*/
public static String layoutCompoundLabel(
FontMetrics fm,
String text,
Icon icon,
int verticalAlignment,
int horizontalAlignment,
int verticalTextPosition,
int horizontalTextPosition,
Rectangle viewR,
Rectangle iconR,
Rectangle textR,
int textIconGap)
{
return layoutCompoundLabelImpl(null, fm, text, icon,
verticalAlignment,
horizontalAlignment,
verticalTextPosition,
horizontalTextPosition,
viewR, iconR, textR, textIconGap);
}
/**
* Compute and return the location of the icons origin, the
* location of origin of the text baseline, and a possibly clipped
* version of the compound labels string. Locations are computed
* relative to the viewR rectangle.
* This layoutCompoundLabel() does not know how to handle LEADING/TRAILING
* values in horizontalTextPosition (they will default to RIGHT) and in
* horizontalAlignment (they will default to CENTER).
* Use the other version of layoutCompoundLabel() instead.
*/
private static String layoutCompoundLabelImpl(
JComponent c,
FontMetrics fm,
String text,
Icon icon,
int verticalAlignment,
int horizontalAlignment,
int verticalTextPosition,
int horizontalTextPosition,
Rectangle viewR,
Rectangle iconR,
Rectangle textR,
int textIconGap)
{
/* Initialize the icon bounds rectangle iconR.
*/
if (icon != null) {
iconR.width = icon.getIconWidth();
iconR.height = icon.getIconHeight();
}
else {
iconR.width = iconR.height = 0;
}
/* Initialize the text bounds rectangle textR. If a null
* or and empty String was specified we substitute "" here
* and use 0,0,0,0 for textR.
*/
boolean textIsEmpty = (text == null) || text.equals("");
int lsb = 0;
int rsb = 0;
/* Unless both text and icon are non-null, we effectively ignore
* the value of textIconGap.
*/
int gap;
View v;
if (textIsEmpty) {
textR.width = textR.height = 0;
text = "";
gap = 0;
}
else {
int availTextWidth;
gap = (icon == null) ? 0 : textIconGap;
if (horizontalTextPosition == CENTER) {
availTextWidth = viewR.width;
}
else {
availTextWidth = viewR.width - (iconR.width + gap);
}
v = (c != null) ? (View) c.getClientProperty("html") : null;
if (v != null) {
textR.width = Math.min(availTextWidth,
(int) v.getPreferredSpan(View.X_AXIS));
textR.height = (int) v.getPreferredSpan(View.Y_AXIS);
} else {
textR.width = SwingUtilities2.stringWidth(c, fm, text);
lsb = SwingUtilities2.getLeftSideBearing(c, fm, text);
if (lsb < 0) {
// If lsb is negative, add it to the width and later
// adjust the x location. This gives more space than is
// actually needed.
// This is done like this for two reasons:
// 1. If we set the width to the actual bounds all
// callers would have to account for negative lsb
// (pref size calculations ONLY look at width of
// textR)
// 2. You can do a drawString at the returned location
// and the text won't be clipped.
textR.width -= lsb;
}
if (textR.width > availTextWidth) {
text = SwingUtilities2.clipString(c, fm, text,
availTextWidth);
textR.width = SwingUtilities2.stringWidth(c, fm, text);
}
textR.height = fm.getHeight();
}
}
/* Compute textR.x,y given the verticalTextPosition and
* horizontalTextPosition properties
*/
if (verticalTextPosition == TOP) {
if (horizontalTextPosition != CENTER) {
textR.y = 0;
}
else {
textR.y = -(textR.height + gap);
}
}
else if (verticalTextPosition == CENTER) {
textR.y = (iconR.height / 2) - (textR.height / 2);
}
else { // (verticalTextPosition == BOTTOM)
if (horizontalTextPosition != CENTER) {
textR.y = iconR.height - textR.height;
}
else {
textR.y = (iconR.height + gap);
}
}
if (horizontalTextPosition == LEFT) {
textR.x = -(textR.width + gap);
}
else if (horizontalTextPosition == CENTER) {
textR.x = (iconR.width / 2) - (textR.width / 2);
}
else { // (horizontalTextPosition == RIGHT)
textR.x = (iconR.width + gap);
}
// WARNING: DefaultTreeCellEditor uses a shortened version of
// this algorithm to position it's Icon. If you change how this
// is calculated, be sure and update DefaultTreeCellEditor too.
/* labelR is the rectangle that contains iconR and textR.
* Move it to its proper position given the labelAlignment
* properties.
*
* To avoid actually allocating a Rectangle, Rectangle.union
* has been inlined below.
*/
int labelR_x = Math.min(iconR.x, textR.x);
int labelR_width = Math.max(iconR.x + iconR.width,
textR.x + textR.width) - labelR_x;
int labelR_y = Math.min(iconR.y, textR.y);
int labelR_height = Math.max(iconR.y + iconR.height,
textR.y + textR.height) - labelR_y;
int dx, dy;
if (verticalAlignment == TOP) {
dy = viewR.y - labelR_y;
}
else if (verticalAlignment == CENTER) {
dy = (viewR.y + (viewR.height / 2)) - (labelR_y + (labelR_height / 2));
}
else { // (verticalAlignment == BOTTOM)
dy = (viewR.y + viewR.height) - (labelR_y + labelR_height);
}
if (horizontalAlignment == LEFT) {
dx = viewR.x - labelR_x;
}
else if (horizontalAlignment == RIGHT) {
dx = (viewR.x + viewR.width) - (labelR_x + labelR_width);
}
else { // (horizontalAlignment == CENTER)
dx = (viewR.x + (viewR.width / 2)) -
(labelR_x + (labelR_width / 2));
}
/* Translate textR and glypyR by dx,dy.
*/
textR.x += dx;
textR.y += dy;
iconR.x += dx;
iconR.y += dy;
if (lsb < 0) {
// lsb is negative. Shift the x location so that the text is
// visually drawn at the right location.
textR.x -= lsb;
textR.width += lsb;
}
if (rsb > 0) {
textR.width -= rsb;
}
return text;
}
/**
* Paints a component to the specified <code>Graphics</code>.
* This method is primarily useful to render
* <code>Component</code>s that don't exist as part of the visible
* containment hierarchy, but are used for rendering. For
* example, if you are doing your own rendering and want to render
* some text (or even HTML), you could make use of
* <code>JLabel</code>'s text rendering support and have it paint
* directly by way of this method, without adding the label to the
* visible containment hierarchy.
* <p>
* This method makes use of <code>CellRendererPane</code> to handle
* the actual painting, and is only recommended if you use one
* component for rendering. If you make use of multiple components
* to handle the rendering, as <code>JTable</code> does, use
* <code>CellRendererPane</code> directly. Otherwise, as described
* below, you could end up with a <code>CellRendererPane</code>
* per <code>Component</code>.
* <p>
* If <code>c</code>'s parent is not a <code>CellRendererPane</code>,
* a new <code>CellRendererPane</code> is created, <code>c</code> is
* added to it, and the <code>CellRendererPane</code> is added to
* <code>p</code>. If <code>c</code>'s parent is a
* <code>CellRendererPane</code> and the <code>CellRendererPane</code>s
* parent is not <code>p</code>, it is added to <code>p</code>.
* <p>
* The component should either descend from <code>JComponent</code>
* or be another kind of lightweight component.
* A lightweight component is one whose "lightweight" property
* (returned by the <code>Component</code>
* <code>isLightweight</code> method)
* is true. If the Component is not lightweight, bad things map happen:
* crashes, exceptions, painting problems...
*
* @param g the <code>Graphics</code> object to draw on
* @param c the <code>Component</code> to draw
* @param p the intermediate <code>Container</code>
* @param x an int specifying the left side of the area draw in, in pixels,
* measured from the left edge of the graphics context
* @param y an int specifying the top of the area to draw in, in pixels
* measured down from the top edge of the graphics context
* @param w an int specifying the width of the area draw in, in pixels
* @param h an int specifying the height of the area draw in, in pixels
*
* @see CellRendererPane
* @see java.awt.Component#isLightweight
*/
public static void paintComponent(Graphics g, Component c, Container p, int x, int y, int w, int h) {
getCellRendererPane(c, p).paintComponent(g, c, p, x, y, w, h,false);
}
/**
* Paints a component to the specified <code>Graphics</code>. This
* is a cover method for
* {@link #paintComponent(Graphics,Component,Container,int,int,int,int)}.
* Refer to it for more information.
*
* @param g the <code>Graphics</code> object to draw on
* @param c the <code>Component</code> to draw
* @param p the intermediate <code>Container</code>
* @param r the <code>Rectangle</code> to draw in
*
* @see #paintComponent(Graphics,Component,Container,int,int,int,int)
* @see CellRendererPane
*/
public static void paintComponent(Graphics g, Component c, Container p, Rectangle r) {
paintComponent(g, c, p, r.x, r.y, r.width, r.height);
}
/*
* Ensures that cell renderer <code>c</code> has a
* <code>ComponentShell</code> parent and that
* the shell's parent is p.
*/
private static CellRendererPane getCellRendererPane(Component c, Container p) {
Container shell = c.getParent();
if (shell instanceof CellRendererPane) {
if (shell.getParent() != p) {
p.add(shell);
}
} else {
shell = new CellRendererPane();
shell.add(c);
p.add(shell);
}
return (CellRendererPane)shell;
}
/**
* A simple minded look and feel change: ask each node in the tree
* to <code>updateUI()</code> -- that is, to initialize its UI property
* with the current look and feel.
*/
public static void updateComponentTreeUI(Component c) {
updateComponentTreeUI0(c);
c.invalidate();
c.validate();
c.repaint();
}
private static void updateComponentTreeUI0(Component c) {
if (c instanceof JComponent) {
JComponent jc = (JComponent) c;
jc.updateUI();
JPopupMenu jpm =jc.getComponentPopupMenu();
if(jpm != null) {
updateComponentTreeUI(jpm);
}
}
Component[] children = null;
if (c instanceof JMenu) {
children = ((JMenu)c).getMenuComponents();
}
else if (c instanceof Container) {
children = ((Container)c).getComponents();
}
if (children != null) {
for (Component child : children) {
updateComponentTreeUI0(child);
}
}
}
/**
* Causes <i>doRun.run()</i> to be executed asynchronously on the
* AWT event dispatching thread. This will happen after all
* pending AWT events have been processed. This method should
* be used when an application thread needs to update the GUI.
* In the following example the <code>invokeLater</code> call queues
* the <code>Runnable</code> object <code>doHelloWorld</code>
* on the event dispatching thread and
* then prints a message.
* <pre>
* Runnable doHelloWorld = new Runnable() {
* public void run() {
* System.out.println("Hello World on " + Thread.currentThread());
* }
* };
*
* SwingUtilities.invokeLater(doHelloWorld);
* System.out.println("This might well be displayed before the other message.");
* </pre>
* If invokeLater is called from the event dispatching thread --
* for example, from a JButton's ActionListener -- the <i>doRun.run()</i> will
* still be deferred until all pending events have been processed.
* Note that if the <i>doRun.run()</i> throws an uncaught exception
* the event dispatching thread will unwind (not the current thread).
* <p>
* Additional documentation and examples for this method can be
* found in
* <A HREF="https://docs.oracle.com/javase/tutorial/uiswing/concurrency/index.html">Concurrency in Swing</a>.
* <p>
* As of 1.3 this method is just a cover for <code>java.awt.EventQueue.invokeLater()</code>.
* <p>
* Unlike the rest of Swing, this method can be invoked from any thread.
*
* @see #invokeAndWait
*/
public static void invokeLater(Runnable doRun) {
EventQueue.invokeLater(doRun);
}
/**
* Causes <code>doRun.run()</code> to be executed synchronously on the
* AWT event dispatching thread. This call blocks until
* all pending AWT events have been processed and (then)
* <code>doRun.run()</code> returns. This method should
* be used when an application thread needs to update the GUI.
* It shouldn't be called from the event dispatching thread.
* Here's an example that creates a new application thread
* that uses <code>invokeAndWait</code> to print a string from the event
* dispatching thread and then, when that's finished, print
* a string from the application thread.
* <pre>
* final Runnable doHelloWorld = new Runnable() {
* public void run() {
* System.out.println("Hello World on " + Thread.currentThread());
* }
* };
*
* Thread appThread = new Thread() {
* public void run() {
* try {
* SwingUtilities.invokeAndWait(doHelloWorld);
* }
* catch (Exception e) {
* e.printStackTrace();
* }
* System.out.println("Finished on " + Thread.currentThread());
* }
* };
* appThread.start();
* </pre>
* Note that if the <code>Runnable.run</code> method throws an
* uncaught exception
* (on the event dispatching thread) it's caught and rethrown, as
* an <code>InvocationTargetException</code>, on the caller's thread.
* <p>
* Additional documentation and examples for this method can be
* found in
* <A HREF="https://docs.oracle.com/javase/tutorial/uiswing/concurrency/index.html">Concurrency in Swing</a>.
* <p>
* As of 1.3 this method is just a cover for
* <code>java.awt.EventQueue.invokeAndWait()</code>.
*
* @exception InterruptedException if we're interrupted while waiting for
* the event dispatching thread to finish executing
* <code>doRun.run()</code>
* @exception InvocationTargetException if an exception is thrown
* while running <code>doRun</code>
*
* @see #invokeLater
*/
public static void invokeAndWait(final Runnable doRun)
throws InterruptedException, InvocationTargetException
{
EventQueue.invokeAndWait(doRun);
}
/**
* Returns true if the current thread is an AWT event dispatching thread.
* <p>
* As of 1.3 this method is just a cover for
* <code>java.awt.EventQueue.isDispatchThread()</code>.
*
* @return true if the current thread is an AWT event dispatching thread
*/
public static boolean isEventDispatchThread()
{
return EventQueue.isDispatchThread();
}
/*
* --- Accessibility Support ---
*
*/
/**
* Get the index of this object in its accessible parent.<p>
*
* Note: as of the Java 2 platform v1.3, it is recommended that developers call
* Component.AccessibleAWTComponent.getAccessibleIndexInParent() instead
* of using this method.
*
* @return -1 of this object does not have an accessible parent.
* Otherwise, the index of the child in its accessible parent.
*/
public static int getAccessibleIndexInParent(Component c) {
return c.getAccessibleContext().getAccessibleIndexInParent();
}
/**
* Returns the <code>Accessible</code> child contained at the
* local coordinate <code>Point</code>, if one exists.
* Otherwise returns <code>null</code>.
*
* @return the <code>Accessible</code> at the specified location,
* if it exists; otherwise <code>null</code>
*/
public static Accessible getAccessibleAt(Component c, Point p) {
if (c instanceof Container) {
return c.getAccessibleContext().getAccessibleComponent().getAccessibleAt(p);
} else if (c instanceof Accessible) {
Accessible a = (Accessible) c;
if (a != null) {
AccessibleContext ac = a.getAccessibleContext();
if (ac != null) {
AccessibleComponent acmp;
Point location;
int nchildren = ac.getAccessibleChildrenCount();
for (int i=0; i < nchildren; i++) {
a = ac.getAccessibleChild(i);
if ((a != null)) {
ac = a.getAccessibleContext();
if (ac != null) {
acmp = ac.getAccessibleComponent();
if ((acmp != null) && (acmp.isShowing())) {
location = acmp.getLocation();
Point np = new Point(p.x-location.x,
p.y-location.y);
if (acmp.contains(np)){
return a;
}
}
}
}
}
}
}
return (Accessible) c;
}
return null;
}
/**
* Get the state of this object. <p>
*
* Note: as of the Java 2 platform v1.3, it is recommended that developers call
* Component.AccessibleAWTComponent.getAccessibleIndexInParent() instead
* of using this method.
*
* @return an instance of AccessibleStateSet containing the current state
* set of the object
* @see AccessibleState
*/
public static AccessibleStateSet getAccessibleStateSet(Component c) {
return c.getAccessibleContext().getAccessibleStateSet();
}
/**
* Returns the number of accessible children in the object. If all
* of the children of this object implement Accessible, than this
* method should return the number of children of this object. <p>
*
* Note: as of the Java 2 platform v1.3, it is recommended that developers call
* Component.AccessibleAWTComponent.getAccessibleIndexInParent() instead
* of using this method.
*
* @return the number of accessible children in the object.
*/
public static int getAccessibleChildrenCount(Component c) {
return c.getAccessibleContext().getAccessibleChildrenCount();
}
/**
* Return the nth Accessible child of the object. <p>
*
* Note: as of the Java 2 platform v1.3, it is recommended that developers call
* Component.AccessibleAWTComponent.getAccessibleIndexInParent() instead
* of using this method.
*
* @param i zero-based index of child
* @return the nth Accessible child of the object
*/
public static Accessible getAccessibleChild(Component c, int i) {
return c.getAccessibleContext().getAccessibleChild(i);
}
/**
* Return the child <code>Component</code> of the specified
* <code>Component</code> that is the focus owner, if any.
*
* @param c the root of the <code>Component</code> hierarchy to
* search for the focus owner
* @return the focus owner, or <code>null</code> if there is no focus
* owner, or if the focus owner is not <code>comp</code>, or a
* descendant of <code>comp</code>
*
* @see java.awt.KeyboardFocusManager#getFocusOwner
* @deprecated As of 1.4, replaced by
* <code>KeyboardFocusManager.getFocusOwner()</code>.
*/
@Deprecated
public static Component findFocusOwner(Component c) {
Component focusOwner = KeyboardFocusManager.
getCurrentKeyboardFocusManager().getFocusOwner();
// verify focusOwner is a descendant of c
for (Component temp = focusOwner; temp != null;
temp = (temp instanceof Window) ? null : temp.getParent())
{
if (temp == c) {
return focusOwner;
}
}
return null;
}
/**
* If c is a JRootPane descendant return its JRootPane ancestor.
* If c is a RootPaneContainer then return its JRootPane.
* @return the JRootPane for Component c or {@code null}.
*/
public static JRootPane getRootPane(Component c) {
if (c instanceof RootPaneContainer) {
return ((RootPaneContainer)c).getRootPane();
}
for( ; c != null; c = c.getParent()) {
if (c instanceof JRootPane) {
return (JRootPane)c;
}
}
return null;
}
/**
* Returns the root component for the current component tree.
* @return the first ancestor of c that's a Window or the last Applet ancestor
*/
public static Component getRoot(Component c) {
Component applet = null;
for(Component p = c; p != null; p = p.getParent()) {
if (p instanceof Window) {
return p;
}
if (p instanceof Applet) {
applet = p;
}
}
return applet;
}
static JComponent getPaintingOrigin(JComponent c) {
Container p = c;
while ((p = p.getParent()) instanceof JComponent) {
JComponent jp = (JComponent) p;
if (jp.isPaintingOrigin()) {
return jp;
}
}
return null;
}
/**
* Process the key bindings for the <code>Component</code> associated with
* <code>event</code>. This method is only useful if
* <code>event.getComponent()</code> does not descend from
* <code>JComponent</code>, or your are not invoking
* <code>super.processKeyEvent</code> from within your
* <code>JComponent</code> subclass. <code>JComponent</code>
* automatically processes bindings from within its
* <code>processKeyEvent</code> method, hence you rarely need
* to directly invoke this method.
*
* @param event KeyEvent used to identify which bindings to process, as
* well as which Component has focus.
* @return true if a binding has found and processed
* @since 1.4
*/
public static boolean processKeyBindings(KeyEvent event) {
if (event != null) {
if (event.isConsumed()) {
return false;
}
Component component = event.getComponent();
boolean pressed = (event.getID() == KeyEvent.KEY_PRESSED);
if (!isValidKeyEventForKeyBindings(event)) {
return false;
}
// Find the first JComponent in the ancestor hierarchy, and
// invoke processKeyBindings on it
while (component != null) {
if (component instanceof JComponent) {
return ((JComponent)component).processKeyBindings(
event, pressed);
}
if ((component instanceof Applet) ||
(component instanceof Window)) {
// No JComponents, if Window or Applet parent, process
// WHEN_IN_FOCUSED_WINDOW bindings.
return JComponent.processKeyBindingsForAllComponents(
event, (Container)component, pressed);
}
component = component.getParent();
}
}
return false;
}
/**
* Returns true if the <code>e</code> is a valid KeyEvent to use in
* processing the key bindings associated with JComponents.
*/
static boolean isValidKeyEventForKeyBindings(KeyEvent e) {
return true;
}
/**
* Invokes <code>actionPerformed</code> on <code>action</code> if
* <code>action</code> is enabled (and non-{@code null}). The command for the
* ActionEvent is determined by:
* <ol>
* <li>If the action was registered via
* <code>registerKeyboardAction</code>, then the command string
* passed in ({@code null} will be used if {@code null} was passed in).
* <li>Action value with name Action.ACTION_COMMAND_KEY, unless {@code null}.
* <li>String value of the KeyEvent, unless <code>getKeyChar</code>
* returns KeyEvent.CHAR_UNDEFINED..
* </ol>
* This will return true if <code>action</code> is non-{@code null} and
* actionPerformed is invoked on it.
*
* @since 1.3
*/
public static boolean notifyAction(Action action, KeyStroke ks,
KeyEvent event, Object sender,
int modifiers) {
if (action == null) {
return false;
}
if (action instanceof UIAction) {
if (!((UIAction)action).isEnabled(sender)) {
return false;
}
}
else if (!action.isEnabled()) {
return false;
}
Object commandO;
boolean stayNull;
// Get the command object.
commandO = action.getValue(Action.ACTION_COMMAND_KEY);
if (commandO == null && (action instanceof JComponent.ActionStandin)) {
// ActionStandin is used for historical reasons to support
// registerKeyboardAction with a null value.
stayNull = true;
}
else {
stayNull = false;
}
// Convert it to a string.
String command;
if (commandO != null) {
command = commandO.toString();
}
else if (!stayNull && event.getKeyChar() != KeyEvent.CHAR_UNDEFINED) {
command = String.valueOf(event.getKeyChar());
}
else {
// Do null for undefined chars, or if registerKeyboardAction
// was called with a null.
command = null;
}
action.actionPerformed(new ActionEvent(sender,
ActionEvent.ACTION_PERFORMED, command, event.getWhen(),
modifiers));
return true;
}
/**
* Convenience method to change the UI InputMap for <code>component</code>
* to <code>uiInputMap</code>. If <code>uiInputMap</code> is {@code null},
* this removes any previously installed UI InputMap.
*
* @since 1.3
*/
public static void replaceUIInputMap(JComponent component, int type,
InputMap uiInputMap) {
InputMap map = component.getInputMap(type, (uiInputMap != null));
while (map != null) {
InputMap parent = map.getParent();
if (parent == null || (parent instanceof UIResource)) {
map.setParent(uiInputMap);
return;
}
map = parent;
}
}
/**
* Convenience method to change the UI ActionMap for <code>component</code>
* to <code>uiActionMap</code>. If <code>uiActionMap</code> is {@code null},
* this removes any previously installed UI ActionMap.
*
* @since 1.3
*/
public static void replaceUIActionMap(JComponent component,
ActionMap uiActionMap) {
ActionMap map = component.getActionMap((uiActionMap != null));
while (map != null) {
ActionMap parent = map.getParent();
if (parent == null || (parent instanceof UIResource)) {
map.setParent(uiActionMap);
return;
}
map = parent;
}
}
/**
* Returns the InputMap provided by the UI for condition
* <code>condition</code> in component <code>component</code>.
* <p>This will return {@code null} if the UI has not installed a InputMap
* of the specified type.
*
* @since 1.3
*/
public static InputMap getUIInputMap(JComponent component, int condition) {
InputMap map = component.getInputMap(condition, false);
while (map != null) {
InputMap parent = map.getParent();
if (parent instanceof UIResource) {
return parent;
}
map = parent;
}
return null;
}
/**
* Returns the ActionMap provided by the UI
* in component <code>component</code>.
* <p>This will return {@code null} if the UI has not installed an ActionMap.
*
* @since 1.3
*/
public static ActionMap getUIActionMap(JComponent component) {
ActionMap map = component.getActionMap(false);
while (map != null) {
ActionMap parent = map.getParent();
if (parent instanceof UIResource) {
return parent;
}
map = parent;
}
return null;
}
// Don't use String, as it's not guaranteed to be unique in a Hashtable.
private static final Object sharedOwnerFrameKey =
new StringBuffer("SwingUtilities.sharedOwnerFrame");
static class SharedOwnerFrame extends Frame implements WindowListener {
public void addNotify() {
super.addNotify();
installListeners();
}
/**
* Install window listeners on owned windows to watch for displayability changes
*/
void installListeners() {
Window[] windows = getOwnedWindows();
for (Window window : windows) {
if (window != null) {
window.removeWindowListener(this);
window.addWindowListener(this);
}
}
}
/**
* Watches for displayability changes and disposes shared instance if there are no
* displayable children left.
*/
public void windowClosed(WindowEvent e) {
synchronized(getTreeLock()) {
Window[] windows = getOwnedWindows();
for (Window window : windows) {
if (window != null) {
if (window.isDisplayable()) {
return;
}
window.removeWindowListener(this);
}
}
dispose();
}
}
public void windowOpened(WindowEvent e) {
}
public void windowClosing(WindowEvent e) {
}
public void windowIconified(WindowEvent e) {
}
public void windowDeiconified(WindowEvent e) {
}
public void windowActivated(WindowEvent e) {
}
public void windowDeactivated(WindowEvent e) {
}
public void show() {
// This frame can never be shown
}
public void dispose() {
try {
getToolkit().getSystemEventQueue();
super.dispose();
} catch (Exception e) {
// untrusted code not allowed to dispose
}
}
}
/**
* Returns a toolkit-private, shared, invisible Frame
* to be the owner for JDialogs and JWindows created with
* {@code null} owners.
* @exception HeadlessException if GraphicsEnvironment.isHeadless()
* returns true.
* @see java.awt.GraphicsEnvironment#isHeadless
*/
static Frame getSharedOwnerFrame() throws HeadlessException {
Frame sharedOwnerFrame =
(Frame)SwingUtilities.appContextGet(sharedOwnerFrameKey);
if (sharedOwnerFrame == null) {
sharedOwnerFrame = new SharedOwnerFrame();
SwingUtilities.appContextPut(sharedOwnerFrameKey,
sharedOwnerFrame);
}
return sharedOwnerFrame;
}
/**
* Returns a SharedOwnerFrame's shutdown listener to dispose the SharedOwnerFrame
* if it has no more displayable children.
* @exception HeadlessException if GraphicsEnvironment.isHeadless()
* returns true.
* @see java.awt.GraphicsEnvironment#isHeadless
*/
static WindowListener getSharedOwnerFrameShutdownListener() throws HeadlessException {
Frame sharedOwnerFrame = getSharedOwnerFrame();
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