source: trunk/src/org/expeditee/gui/MouseEventRouter.java@ 22

package org.expeditee.gui;

import java.awt.AWTEvent;
import java.awt.Component;
import java.awt.Container;
import java.awt.Point;
import java.awt.Toolkit;
import java.awt.event.AWTEventListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseWheelEvent;

import javax.swing.JComponent;
import javax.swing.JMenuBar;
import javax.swing.JPopupMenu;
import javax.swing.SwingUtilities;

import org.expeditee.items.InteractiveWidget;
import org.expeditee.items.Item;

/**
 * The gateway for mouse input; conditionally forwards mouse messages to swing
 * components / expeditee frames for the Browser
 * 
 * @author Brook Novak
 * 
 */
public class MouseEventRouter extends JComponent implements AWTEventListener{

        private static final long serialVersionUID = 1L;

        private JMenuBar _menuBar;

        private Container _contentPane;

        public MouseEventRouter(JMenuBar menuBar, Container contentPane) {

                if (contentPane == null)
                        throw new NullPointerException("contentPane");

                // Listen for all AWT events (ensures popups are included)
                Toolkit.getDefaultToolkit().addAWTEventListener(
                                this,
                                AWTEvent.MOUSE_MOTION_EVENT_MASK | AWTEvent.MOUSE_EVENT_MASK
                                                | AWTEvent.MOUSE_WHEEL_EVENT_MASK);

                this._menuBar = menuBar;
                this._contentPane = contentPane;
        }

        /**
         * All events for every component in frame are fired to here
         */
        public void eventDispatched(AWTEvent event) {
                if (event instanceof MouseEvent) {
                        routeMouseEvent((MouseEvent) event);
                }
        }

        /**
         * Forwards the mouse event to its appropriate destination. For events that
         * belong to Expiditee space the events are consumed and manually routed to
         * the mouse actions handler.
         * 
         * @param e
         *            The mouse event for any component in the browser frame
         */
        private void routeMouseEvent(MouseEvent e) {

                // First convert the point to expeditee space
                Point containerPoint = SwingUtilities.convertPoint(e.getComponent(), e
                                .getPoint(), _contentPane);

                if (containerPoint.y < 0) { // not in the content pane

                        if (_menuBar != null
                                        && containerPoint.y + _menuBar.getHeight() >= 0) {
                                // The mouse event is over the menu bar.
                                // Could handle specially.
                        } else {
                                // The mouse event is over non-system window
                                // decorations, such as the ones provided by
                                // the Java look and feel.
                                // Could handle specially.
                        }

                } else {

                        // Check to see if the mouse is over an expeditee item or
                        // whether an expeditee item is currently picked up
                        boolean forwardToExpiditee = false;

                        // Note: all frame.content pane events belong to expeditee
                        if (e.getSource() == _contentPane
                                        || e.getSource() == Browser._theBrowser
                                        || Frame.itemAttachedToCursor()) {
                                forwardToExpiditee = true;
                        } else if (DisplayIO.getCurrentFrame() != null) { // is mouse over
                                // a specific
                                // expeditee
                                // item?
                                // NOTE: Do not use FrameUtils.getCurrentItem() - thats relevent
                                // for old mouse position only
                                for (Item i : DisplayIO.getCurrentFrame().getItems()) {
                                        if (i.getPolygon().contains(containerPoint)) {
                                                forwardToExpiditee = true;
                                                break;
                                        }
                                }
                        }

                        if (forwardToExpiditee) {

                                // If forwarding to Expiditee ensure that widgets highlighting
                                // is enabled
                                // do give visual feedback yo users such that Expiditee has
                                // focus.
                                InteractiveWidget.enableExepiteeHighlighting(true);

                                // Ensure that underlying widgets don't get the event
                                e.consume();

                                // Create artificial mouse event and forward it to expeditee
                                MouseEvent expediteeEvent = SwingUtilities.convertMouseEvent(e
                                                .getComponent(), e, _contentPane);

                                switch (e.getID()) {
                                case MouseEvent.MOUSE_MOVED:
                                        FrameMouseActions.getInstance().mouseMoved(expediteeEvent);

                                        // Ensure that expiditee has focus only if no popups exist
                                        if (!Browser._theBrowser.getContentPane().isFocusOwner()
                                                        && !isPopupVisible()) {
                                                Browser._theBrowser.getContentPane().requestFocus();
                                        }

                                        break;
                                case MouseEvent.MOUSE_CLICKED:
                                        FrameMouseActions.getInstance()
                                                        .mouseClicked(expediteeEvent);
                                        break;
                                case MouseEvent.MOUSE_PRESSED:
                                        FrameMouseActions.getInstance().ProccessMousePressedEvent(
                                                        expediteeEvent, e.getModifiersEx());
                                        break;
                                case MouseEvent.MOUSE_RELEASED:
                                        FrameMouseActions.getInstance().mouseReleased(
                                                        expediteeEvent);
                                        break;
                                case MouseEvent.MOUSE_WHEEL:
                                        FrameMouseActions.getInstance().mouseWheelMoved(
                                                        (MouseWheelEvent) expediteeEvent);
                                        break;
                                case MouseEvent.MOUSE_ENTERED:
                                        FrameMouseActions.getInstance()
                                                        .mouseEntered(expediteeEvent);
                                        break;
                                case MouseEvent.MOUSE_EXITED:
                                        FrameMouseActions.getInstance().mouseExited(expediteeEvent);
                                        break;
                                case MouseEvent.MOUSE_DRAGGED:
                                        FrameMouseActions.getInstance()
                                                        .mouseDragged(expediteeEvent);
                                        break;
                                }

                        } else {

                                // If forwarding to swing ensure that widgets are not
                                // highlighted
                                // to give visual feedback yo users such that swing has focus.
                                InteractiveWidget.enableExepiteeHighlighting(false);

                                // Also bring expideditee behaviour to swing: Auto-focus on
                                // component
                                // whenever the mouse moves over it.
                                if (e.getID() == MouseEvent.MOUSE_MOVED) {
                                        if (e.getSource() instanceof Component) {
                                                Component target = (Component) e.getSource();
                                                if (!target.isFocusOwner()) {
                                                        target.requestFocus();
                                                }
                                        }
                                }
                        }
                }
        }

        public static boolean isPopupVisible() {
                return isPopupVisible(Browser._theBrowser.getLayeredPane());
        }

        private static boolean isPopupVisible(Container parent) {

                for (Component c : parent.getComponents()) {

                        if (c instanceof JPopupMenu && ((JPopupMenu) c).isVisible()) {
                                return true;

                        } else if (c instanceof Container
                                        && c != Browser._theBrowser.getContentPane()) {
                                if (isPopupVisible((Container) c))
                                        return true;
                        }
                }

                return false;
        }
}