/*
* Copyright (c) 2002, 2003, 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.plaf.synth;
import javax.swing.*;
import java.util.*;
/**
* An immutable transient object containing contextual information about
* a <code>Region</code>. A <code>SynthContext</code> should only be
* considered valid for the duration
* of the method it is passed to. In other words you should not cache
* a <code>SynthContext</code> that is passed to you and expect it to
* remain valid.
*
* @since 1.5
* @author Scott Violet
*/
public class SynthContext {
private static final Map contextMap;
private JComponent component;
private Region region;
private SynthStyle style;
private int state;
static {
contextMap = new HashMap();
}
static SynthContext getContext(Class type, JComponent component,
Region region, SynthStyle style,
int state) {
SynthContext context = null;
synchronized(contextMap) {
java.util.List instances = (java.util.List)contextMap.get(type);
if (instances != null) {
int size = instances.size();
if (size > 0) {
context = (SynthContext)instances.remove(size - 1);
}
}
}
if (context == null) {
try {
context = (SynthContext)type.newInstance();
} catch (IllegalAccessException iae) {
} catch (InstantiationException ie) {
}
}
context.reset(component, region, style, state);
return context;
}
static void releaseContext(SynthContext context) {
synchronized(contextMap) {
java.util.List instances = (java.util.List)contextMap.get(
context.getClass());
if (instances == null) {
instances = new ArrayList(5);
contextMap.put(context.getClass(), instances);
}
instances.add(context);
}
}
SynthContext() {
}
/**
* Creates a SynthContext with the specified values. This is meant
* for subclasses and custom UI implementors. You very rarely need to
* construct a SynthContext, though some methods will take one.
*
* @param component JComponent
* @param region Identifies the portion of the JComponent
* @param style Style associated with the component
* @param state State of the component as defined in SynthConstants.
* @throws NullPointerException if component, region of style is null.
*/
public SynthContext(JComponent component, Region region, SynthStyle style,
int state) {
if (component == null || region == null || style == null) {
throw new NullPointerException(
"You must supply a non-null component, region and style");
}
reset(component, region, style, state);
}
/**
* Returns the hosting component containing the region.
*
* @return Hosting Component
*/
public JComponent getComponent() {
return component;
}
/**
* Returns the Region identifying this state.
*
* @return Region of the hosting component
*/
public Region getRegion() {
return region;
}
/**
* A convenience method for <code>getRegion().isSubregion()</code>.
*/
boolean isSubregion() {
return getRegion().isSubregion();
}
void setStyle(SynthStyle style) {
this.style = style;
}
/**
* Returns the style associated with this Region.
*
* @return SynthStyle associated with the region.
*/
public SynthStyle getStyle() {
return style;
}
void setComponentState(int state) {
this.state = state;
}
/**
* Returns the state of the widget, which is a bitmask of the
* values defined in <code>SynthConstants</code>. A region will at least
* be in one of
* <code>ENABLED</code>, <code>MOUSE_OVER</code>, <code>PRESSED</code>
* or <code>DISABLED</code>.
*
* @see SynthConstants
* @return State of Component
*/
public int getComponentState() {
return state;
}
/**
* Resets the state of the Context.
*/
void reset(JComponent component, Region region, SynthStyle style,
int state) {
this.component = component;
this.region = region;
this.style = style;
this.state = state;
}
void dispose() {
this.component = null;
this.style = null;
releaseContext(this);
}
/**
* Convenience method to get the Painter from the current SynthStyle.
* This will NEVER return null.
*/
SynthPainter getPainter() {
SynthPainter painter = getStyle().getPainter(this);
if (painter != null) {
return painter;
}
return SynthPainter.NULL_PAINTER;
}
}