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/*
* Copyright 2000-2009 JetBrains s.r.o.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package com.intellij.openapi.ui;
import com.intellij.util.containers.ContainerUtil;
import org.jetbrains.annotations.Nullable;
import javax.swing.*;
import java.awt.*;
import java.util.List;
public abstract class AbstractPainter implements Painter {
private boolean myNeedsRepaint;
private final List<Listener> myListeners = ContainerUtil.createLockFreeCopyOnWriteList();
public boolean needsRepaint() {
return myNeedsRepaint;
}
public void setNeedsRepaint(final boolean needsRepaint) {
setNeedsRepaint(needsRepaint, null);
}
public void setNeedsRepaint(final boolean needsRepaint, @Nullable JComponent dirtyComponent) {
myNeedsRepaint = needsRepaint;
if (myNeedsRepaint) {
fireNeedsRepaint(dirtyComponent);
}
}
public void addListener(final Listener listener) {
myListeners.add(listener);
}
public void removeListener(final Listener listener) {
myListeners.remove(listener);
}
@Nullable
public <T> T setNeedsRepaint(T oldValue, T newValue) {
if (!myNeedsRepaint) {
if (oldValue != null) {
setNeedsRepaint(!oldValue.equals(newValue));
} else if (newValue != null) {
setNeedsRepaint(!newValue.equals(oldValue));
} else {
setNeedsRepaint(false);
}
}
return newValue;
}
@Nullable
public <T> T setNeedsRepaint(T oldValue, T newValue, JComponent dirtyComponent) {
if (!myNeedsRepaint) {
if (oldValue != null) {
setNeedsRepaint(!oldValue.equals(newValue));
} else if (newValue != null) {
setNeedsRepaint(!newValue.equals(oldValue));
} else {
setNeedsRepaint(false);
}
}
return newValue;
}
protected void fireNeedsRepaint(JComponent dirtyComponent) {
for (Listener each : myListeners) {
each.onNeedsRepaint(this, dirtyComponent);
}
}
public final void paint(final Component component, final Graphics2D g) {
myNeedsRepaint = false;
executePaint(component, g);
}
public abstract void executePaint(final Component component, final Graphics2D g);
}
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