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* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
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* 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.
*
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package com.sun.tools.visualvm.core.properties;
import java.util.ArrayList;
import java.util.List;
import javax.swing.JPanel;
import javax.swing.event.ChangeEvent;
import javax.swing.event.ChangeListener;
import javax.swing.plaf.PanelUI;
/**
* UI component to display and modify the properties. Provides validity
* notification support to correctly handle actual state of the user-provided
* data - valid or invalid.
*
* Note: if using custom JPanel instances in the PropertiesPanel be sure to use
* JPanel.setOpaque(false) whenever possible to keep the settings UI consistent.
* For some Look and Feels the PropertiesPanel container doesn't have a standard
* JPanel background.
*
* @since VisualVM 1.2
* @author Jiri Sedlacek
*/
public class PropertiesPanel extends JPanel {
private boolean settingsValid = true;
private List<ChangeListener> listeners = new ArrayList();
/**
* Returns true if settings defined by this Panel are valid.
* To be called in EDT.
*
* @return true if settings defined by this Panel are valid
*/
public final boolean settingsValid() {
return settingsValid;
}
/**
* Add a ChangeListener. Use settingsValid() method to read the state.
* To be called in EDT.
*
* @param listener ChangeListener
*/
public final void addChangeListener(ChangeListener listener) {
if (!listeners.contains(listener)) listeners.add(listener);
}
/**
* Remove a ChangeListener. To be called in EDT.
* @param listener ChangeListener
*/
public final void removeChangeListener(ChangeListener listener) {
listeners.remove(listener);
}
/**
* Notifies the Panel that validity of the user-provided data changed.
* To be called in EDT.
*
* @param valid true if the current settings are valid, false otherwise
*/
protected final void setSettingsValid(boolean valid) {
if (settingsValid != valid) {
settingsValid = valid;
fireStateChanged();
}
}
public void setUI(PanelUI ui) {
super.setUI(ui);
setOpaque(false);
}
private void fireStateChanged() {
for (ChangeListener listener : listeners)
listener.stateChanged(new ChangeEvent(this));
}
}