/*
 * Created on Apr 25, 2005
 */
package org.flexdock.dockbar.event;

import java.awt.AWTEvent;
import java.awt.Component;
import java.awt.EventQueue;
import java.awt.KeyboardFocusManager;
import java.awt.Point;
import java.awt.Toolkit;
import java.awt.event.AWTEventListener;
import java.awt.event.MouseEvent;
import java.beans.PropertyChangeEvent;
import java.beans.PropertyChangeListener;

import javax.swing.SwingUtilities;

import org.flexdock.dockbar.DockbarManager;
import org.flexdock.dockbar.ViewPane;
import org.flexdock.docking.DockingConstants;
import org.flexdock.util.SwingUtility;

/**
 * @author Christopher Butler
 */
public class DockbarTracker implements DockingConstants, PropertyChangeListener, AWTEventListener {

	public static void register() {
		EventQueue.invokeLater(new Runnable() {
			public void run() {
				DockbarTracker tracker = new DockbarTracker();
				// register a propertyChangeListener to update the 'currrent'
				// DockbarManager each time the focused window changes
				KeyboardFocusManager focusManager = KeyboardFocusManager.getCurrentKeyboardFocusManager();
				focusManager.addPropertyChangeListener(tracker);
				
				// register an AWTEventListener to handle low-level mouse events
				long evtType = AWTEvent.MOUSE_MOTION_EVENT_MASK | AWTEvent.MOUSE_EVENT_MASK;
				Toolkit.getDefaultToolkit().addAWTEventListener(tracker, evtType);
			}
		});
	}
	
	public void propertyChange(PropertyChangeEvent evt) {
		if(ACTIVE_WINDOW.equals(evt.getPropertyName())) {
			Component newWindow = SwingUtility.toComponent(evt.getNewValue());
			DockbarManager.windowChanged(newWindow);
		}
	}
	
	public void eventDispatched(AWTEvent event) {
		//catch all mouseMoved events
		int evtType = event.getID();
		if(evtType!=MouseEvent.MOUSE_MOVED && evtType!=MouseEvent.MOUSE_PRESSED)
			return;
		
		// get the activation listener for the current dockbarManager
		DockbarManager mgr = DockbarManager.getCurrent();
		ActivationListener listener = mgr==null? null: mgr.getActivationListener();
		if(listener==null || !listener.isAvailable())
			return;

		// translate the mouse event to the viewpane parent
		MouseEvent evt = (MouseEvent)event;
		Point p = SwingUtilities.convertPoint((Component)evt.getSource(), evt.getPoint(), mgr.getViewPane().getParent());
		ViewPane viewPane = mgr.getViewPane();
		boolean mouseOver = viewPane.getBounds().contains(p);
		
		if(evtType==MouseEvent.MOUSE_PRESSED)
			// check mousePressed for activation/deactivation
			listener.mousePressed(p, mouseOver);
		else
			// check for mouseEnter and mouseExit events
			handleMouseMove(listener, p, mouseOver);
	}
	
	private void handleMouseMove(ActivationListener listener, Point mousePoint, boolean mouseOver) {
		if(mouseOver) {
			if(!listener.isMouseOver())
				listener.mouseEntered(mousePoint);
		}
		else {
			if(listener.isMouseOver())
				listener.mouseExited(mousePoint);
		}
	}
}
