/*
 * :tabSize=4:indentSize=4:noTabs=false:
 * :folding=explicit:collapseFolds=1:
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU General Public License
 * as published by the Free Software Foundation; either version 2
 * of the License, or any later version.
 *
 * This program 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 for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
 */
package projectviewer.vpt;

//{{{ Imports
import java.awt.event.MouseEvent;
import java.awt.event.MouseListener;

import javax.swing.tree.TreePath;
import javax.swing.SwingUtilities;
import javax.swing.event.TreeSelectionEvent;
import javax.swing.event.TreeSelectionListener;

import org.gjt.sp.jedit.jEdit;
import org.gjt.sp.jedit.Buffer;

import projectviewer.ProjectViewer;
//}}}

/**
 *	Listens to the project JTree and responds to file selections.
 *
 *	@author     <A HREF="mailto:burton@relativity.yi.org">Kevin A. Burton</A>
 *	@author		Marcelo Vanzin
 *	@version	$Id: VPTSelectionListener.java 6334 2005-02-10 06:33:28Z vanza $
 */
public final class VPTSelectionListener implements TreeSelectionListener, MouseListener {

	//{{{ Instance Variables
	private ProjectViewer viewer;

	private int lastClickButton;
	private long lastClickTime;
	private Object lastClickTarget;

	private boolean reportsClickCountCorrectly;
	//}}}

	//{{{ +VPTSelectionListener(ProjectViewer) : <init>
	/**
	 *	Create a new <code>ProjectTreeSelectionListener
	 */
	public VPTSelectionListener(ProjectViewer aViewer) {
		viewer = aViewer;
		lastClickTime = 0L;
		reportsClickCountCorrectly = false;
	} //}}}

	//{{{ MouseListener interfaces

	//{{{ +mouseClicked(MouseEvent) : void
	/**
	 *	Determines when the user clicks on the JTree.
	 *
	 * @param  evt  Description of Parameter
	 */
	public void mouseClicked(MouseEvent evt) {
		if (SwingUtilities.isMiddleMouseButton(evt)) {
			TreePath path = viewer.getCurrentTree()
				.getPathForLocation(evt.getX(), evt.getY());
			viewer.getCurrentTree().setSelectionPath(path);
		}

		VPTNode node = viewer.getSelectedNode();
		if (node == null) {
			return;
		}

		boolean doubleClick = isDoubleClick(evt);
		boolean middleClick = SwingUtilities.isMiddleMouseButton(evt);
		if (middleClick || doubleClick) {
			if(node.canOpen()) {
				boolean nodeOpen = node.isOpened();
				if(nodeOpen
						&& ((doubleClick && jEdit.getBooleanProperty("vfs.browser.doubleClickClose"))
						|| middleClick)) {
					node.close();
					ProjectViewer.nodeChanged(node);
				} else if (!nodeOpen) {
					node.open();
					ProjectViewer.nodeChanged(node);
				}
			}
			return;
		}

		TreePath path = viewer.getCurrentTree()
				.getPathForLocation(evt.getX(), evt.getY());
		if (path == null || (path.getLastPathComponent() != node)) {
			return;
		}

		if (SwingUtilities.isLeftMouseButton(evt) && node.isOpened()) {
			Buffer b = jEdit.getBuffer(node.getNodePath());
			if (b != null) {
				viewer.getView().setBuffer(b);
			}
		}
	} //}}}

	public void mousePressed(MouseEvent evt) { }

	public void mouseReleased(MouseEvent evt) { }

	public void mouseEntered(MouseEvent evt) { }

	public void mouseExited(MouseEvent evt) { }

	//}}}

	//{{{ TreeSelectionListener implementation

	/**
	 *	Receive notification that the tree selection has changed. Shows node
	 *	information on the status bar and, if the selected node is opened
	 *	but is not the current buffer, change the current buffer.
	 *
	 *	<p>Also, if added node is a project, and it's not loaded, load it.
	 *	This allows easier keyboard navigation when using groups as the
	 &	tree root.</p>
	 *
	 *	@param  e  The selection event.
	 */
	public void valueChanged(TreeSelectionEvent e) {
		lastClickTarget = null;
		if (!e.isAddedPath()) return;
		viewer.setStatus(e.getPath().getLastPathComponent().toString());
	}

	//}}}

	//{{{ -isDoubleClick(MouseEvent) : boolean
	/**
	 *	Because IBM's JDK doesn't support <code>getClickCount()</code> for <code>JTree</code>
	 *	properly, we have to do this.
	 *
	 *	@param  evt  Description of Parameter
	 *	@return      The doubleClick value
	 */
	private boolean isDoubleClick(MouseEvent evt) {
		if (reportsClickCountCorrectly)
			return evt.getClickCount() == 2;
		if (evt.getClickCount() == 2) {
			reportsClickCountCorrectly = true;
			return true;
		}

		TreePath path = viewer.getCurrentTree().getPathForLocation(evt.getX(), evt.getY());
		if(path == null) {
			lastClickTarget = null;
			return false;
		}

		Object target = path.getLastPathComponent();

		if(target == lastClickTarget &&
				target == viewer.getSelectedNode() &&
				lastClickButton == evt.getModifiers() &&
				(System.currentTimeMillis() - lastClickTime < 500L)) {
			lastClickTarget = null;
			return true;
		}

		lastClickButton = evt.getModifiers();
		lastClickTarget = target;
		lastClickTime = System.currentTimeMillis();
		return false;
	} //}}}

}