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/*******************************************************************************
 * Copyright (c) 2000, 2010 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.draw2d;

import org.eclipse.swt.SWT;
import org.eclipse.swt.accessibility.AccessibleControlEvent;
import org.eclipse.swt.accessibility.AccessibleControlListener;
import org.eclipse.swt.accessibility.AccessibleEvent;
import org.eclipse.swt.accessibility.AccessibleListener;
import org.eclipse.swt.events.DisposeEvent;
import org.eclipse.swt.events.TraverseEvent;
import org.eclipse.swt.graphics.Cursor;
import org.eclipse.swt.widgets.Control;

/**
 * The SWTEventDispatcher provides draw2d with the ability to dispatch SWT
 * Events. The {@link org.eclipse.draw2d.LightweightSystem} adds SWT event
 * listeners on its Canvas. When the Canvas receives an SWT event, it calls the
 * appropriate dispatcher method in SWTEventDispatcher.
 */
public class SWTEventDispatcher extends EventDispatcher {

	/**
	 * Used to tell if any button is pressed without regard to the specific
	 * button.
	 * 
	 * @deprecated Use {@link SWT#BUTTON_MASK} instead.
	 */
	protected static final int ANY_BUTTON = SWT.BUTTON_MASK;

	private boolean figureTraverse = true;

	private boolean captured;
	private IFigure root;
	private IFigure mouseTarget;
	private IFigure cursorTarget;
	private IFigure focusOwner;
	private IFigure hoverSource;

	private MouseEvent currentEvent;
	private Cursor cursor;
	/** The control this dispatcher is listening to. */
	protected org.eclipse.swt.widgets.Control control;

	private ToolTipHelper toolTipHelper;
	private FocusTraverseManager focusManager = new FocusTraverseManager();

	/**
	 * Implements {@link EventDispatcher.AccessibilityDispatcher} but does
	 * nothing in the implementation.
	 */
	protected class FigureAccessibilityDispatcher extends
			AccessibilityDispatcher {
		/** @see AccessibleControlListener#getChildAtPoint(AccessibleControlEvent) */
		public void getChildAtPoint(AccessibleControlEvent e) {
		}

		/** @see AccessibleControlListener#getChildCount(AccessibleControlEvent) */
		public void getChildCount(AccessibleControlEvent e) {
		}

		/** @see AccessibleControlListener#getChildren(AccessibleControlEvent) */
		public void getChildren(AccessibleControlEvent e) {
		}

		/** @see AccessibleControlListener#getDefaultAction(AccessibleControlEvent) */
		public void getDefaultAction(AccessibleControlEvent e) {
		}

		/** @see AccessibleListener#getDescription(AccessibleEvent) */
		public void getDescription(AccessibleEvent e) {
		}

		/** @see AccessibleControlListener#getFocus(AccessibleControlEvent) */
		public void getFocus(AccessibleControlEvent e) {
		}

		/** @see AccessibleListener#getHelp(AccessibleEvent) */
		public void getHelp(AccessibleEvent e) {
		}

		/** @see AccessibleListener#getKeyboardShortcut(AccessibleEvent) */
		public void getKeyboardShortcut(AccessibleEvent e) {
		}

		/** @see AccessibleControlListener#getLocation(AccessibleControlEvent) */
		public void getLocation(AccessibleControlEvent e) {
		}

		/** @see AccessibleListener#getName(AccessibleEvent) */
		public void getName(AccessibleEvent e) {
		}

		/** @see AccessibleControlListener#getRole(AccessibleControlEvent) */
		public void getRole(AccessibleControlEvent e) {
		}

		/** @see AccessibleControlListener#getSelection(AccessibleControlEvent) */
		public void getSelection(AccessibleControlEvent e) {
		}

		/** @see AccessibleControlListener#getState(AccessibleControlEvent) */
		public void getState(AccessibleControlEvent e) {
		}

		/** @see AccessibleControlListener#getValue(AccessibleControlEvent) */
		public void getValue(AccessibleControlEvent e) {
		}
	}

	/**
	 * @see EventDispatcher#dispatchFocusGained(org.eclipse.swt.events.FocusEvent)
	 */
	public void dispatchFocusGained(org.eclipse.swt.events.FocusEvent e) {
		IFigure currentFocusOwner = getFocusTraverseManager()
				.getCurrentFocusOwner();

		/*
		 * Upon focus gained, if there is no current focus owner, set focus on
		 * first focusable child.
		 */
		if (currentFocusOwner == null)
			currentFocusOwner = getFocusTraverseManager()
					.getNextFocusableFigure(root, focusOwner);
		setFocus(currentFocusOwner);
	}

	/**
	 * @see EventDispatcher#dispatchFocusLost(org.eclipse.swt.events.FocusEvent)
	 */
	public void dispatchFocusLost(org.eclipse.swt.events.FocusEvent e) {
		setFocus(null);
	}

	/**
	 * @see EventDispatcher#dispatchKeyPressed(org.eclipse.swt.events.KeyEvent)
	 */
	public void dispatchKeyPressed(org.eclipse.swt.events.KeyEvent e) {
		if (focusOwner != null) {
			KeyEvent event = new KeyEvent(this, focusOwner, e);
			focusOwner.handleKeyPressed(event);
		}
	}

	/**
	 * @see EventDispatcher#dispatchKeyReleased(org.eclipse.swt.events.KeyEvent)
	 */
	public void dispatchKeyReleased(org.eclipse.swt.events.KeyEvent e) {
		if (focusOwner != null) {
			KeyEvent event = new KeyEvent(this, focusOwner, e);
			focusOwner.handleKeyReleased(event);
		}
	}

	/**
	 * @see EventDispatcher#dispatchKeyTraversed(TraverseEvent)
	 */
	public void dispatchKeyTraversed(TraverseEvent e) {
		if (!figureTraverse)
			return;
		IFigure nextFigure = null;

		if (e.detail == SWT.TRAVERSE_TAB_NEXT)
			nextFigure = getFocusTraverseManager().getNextFocusableFigure(root,
					focusOwner);
		else if (e.detail == SWT.TRAVERSE_TAB_PREVIOUS)
			nextFigure = getFocusTraverseManager().getPreviousFocusableFigure(
					root, focusOwner);

		if (nextFigure != null) {
			e.doit = false;
			setFocus(nextFigure);
		}
	}

	/**
	 * @see EventDispatcher#dispatchMouseHover(org.eclipse.swt.events.MouseEvent)
	 */
	public void dispatchMouseHover(org.eclipse.swt.events.MouseEvent me) {
		receive(me);
		if (mouseTarget != null)
			mouseTarget.handleMouseHover(currentEvent);
		/*
		 * Check Tooltip source. Get Tooltip source's Figure. Set that tooltip
		 * as the lws contents on the helper.
		 */
		if (hoverSource != null) {
			toolTipHelper = getToolTipHelper();
			IFigure tip = hoverSource.getToolTip();
			Control control = (Control) me.getSource();
			org.eclipse.swt.graphics.Point absolute;
			absolute = control.toDisplay(new org.eclipse.swt.graphics.Point(
					me.x, me.y));
			toolTipHelper.displayToolTipNear(hoverSource, tip, absolute.x,
					absolute.y);
		}
	}

	/**
	 * @see EventDispatcher#dispatchMouseDoubleClicked(org.eclipse.swt.events.MouseEvent)
	 */
	public void dispatchMouseDoubleClicked(org.eclipse.swt.events.MouseEvent me) {
		receive(me);
		if (mouseTarget != null)
			mouseTarget.handleMouseDoubleClicked(currentEvent);
	}

	/**
	 * @see EventDispatcher#dispatchMouseEntered(org.eclipse.swt.events.MouseEvent)
	 */
	public void dispatchMouseEntered(org.eclipse.swt.events.MouseEvent me) {
		receive(me);
	}

	/**
	 * @see EventDispatcher#dispatchMouseExited(org.eclipse.swt.events.MouseEvent)
	 */
	public void dispatchMouseExited(org.eclipse.swt.events.MouseEvent me) {
		setHoverSource(null, me);
		if (mouseTarget != null) {
			currentEvent = new MouseEvent(this, mouseTarget, me);
			mouseTarget.handleMouseExited(currentEvent);
			releaseCapture();
			mouseTarget = null;
		}
	}

	/**
	 * @see EventDispatcher#dispatchMousePressed(org.eclipse.swt.events.MouseEvent)
	 */
	public void dispatchMousePressed(org.eclipse.swt.events.MouseEvent me) {
		receive(me);
		if (mouseTarget != null) {
			mouseTarget.handleMousePressed(currentEvent);
			if (currentEvent.isConsumed())
				setCapture(mouseTarget);
		}
	}

	/**
	 * @see EventDispatcher#dispatchMouseMoved(org.eclipse.swt.events.MouseEvent)
	 */
	public void dispatchMouseMoved(org.eclipse.swt.events.MouseEvent me) {
		receive(me);
		if (mouseTarget != null) {
			if ((me.stateMask & SWT.BUTTON_MASK) != 0)
				mouseTarget.handleMouseDragged(currentEvent);
			else
				mouseTarget.handleMouseMoved(currentEvent);
		}
	}

	/**
	 * @see EventDispatcher#dispatchMouseReleased(org.eclipse.swt.events.MouseEvent)
	 */
	public void dispatchMouseReleased(org.eclipse.swt.events.MouseEvent me) {
		receive(me);
		if (mouseTarget != null) {
			mouseTarget.handleMouseReleased(currentEvent);
		}
		releaseCapture();
		receive(me);
	}

	/**
	 * @see EventDispatcher#getAccessibilityDispatcher()
	 */
	protected AccessibilityDispatcher getAccessibilityDispatcher() {
		return null;
	}

	/**
	 * Returns the current mouse event.
	 * 
	 * @return the current mouse event; can be null
	 */
	protected MouseEvent getCurrentEvent() {
		return currentEvent;
	}

	private IFigure getCurrentToolTip() {
		if (hoverSource != null)
			return hoverSource.getToolTip();
		else
			return null;
	}

	/**
	 * Returns the figure that the cursor is over.
	 * 
	 * @return the cursor target
	 */
	protected IFigure getCursorTarget() {
		return cursorTarget;
	}

	/**
	 * Returns the ToolTipHelper used to display tooltips on hover events.
	 * 
	 * @return the ToolTipHelper
	 */
	protected ToolTipHelper getToolTipHelper() {
		if (toolTipHelper == null)
			toolTipHelper = new ToolTipHelper(control);
		return toolTipHelper;
	}

	/**
	 * Returns the FocusTraverseManager which is used to determine which figure
	 * will get focus when a TAB or ALT+TAB key sequence occurs.
	 * 
	 * @return the FocusTraverseManager
	 */
	protected final FocusTraverseManager getFocusTraverseManager() {
		if (focusManager == null) {
			focusManager = new FocusTraverseManager();
		}
		return focusManager;
	}

	/**
	 * @see EventDispatcher#getFocusOwner()
	 * @since 3.6
	 */
	public IFigure getFocusOwner() {
		return focusOwner;
	}

	/**
	 * Returns the figure that is the target of mouse events. This may not be
	 * the figure beneath the cursor because another figure may have captured
	 * the mouse and will continue to get mouse events until capture is
	 * released.
	 * 
	 * @return the mouse target
	 */
	protected IFigure getMouseTarget() {
		return mouseTarget;
	}

	/**
	 * Returns the root figure for this dispatcher.
	 * 
	 * @return the root figure
	 */
	protected IFigure getRoot() {
		return root;
	}

	/**
	 * @see EventDispatcher#isCaptured()
	 */
	public boolean isCaptured() {
		return captured;
	}

	private void receive(org.eclipse.swt.events.MouseEvent me) {
		currentEvent = null;
		updateFigureUnderCursor(me);
		if (captured) {
			if (mouseTarget != null)
				currentEvent = new MouseEvent(this, mouseTarget, me);
		} else {
			IFigure f = root.findMouseEventTargetAt(me.x, me.y);
			if (f == mouseTarget) {
				if (mouseTarget != null)
					currentEvent = new MouseEvent(this, mouseTarget, me);
				return;
			}
			if (mouseTarget != null) {
				currentEvent = new MouseEvent(this, mouseTarget, me);
				mouseTarget.handleMouseExited(currentEvent);
			}
			setMouseTarget(f);
			if (mouseTarget != null) {
				currentEvent = new MouseEvent(this, mouseTarget, me);
				mouseTarget.handleMouseEntered(currentEvent);
			}
		}
	}

	/**
	 * @see EventDispatcher#releaseCapture()
	 */
	protected void releaseCapture() {
		captured = false;
	}

	/**
	 * @see EventDispatcher#requestFocus(IFigure)
	 */
	public void requestFocus(IFigure fig) {
		setFocus(fig);
	}

	/**
	 * @see EventDispatcher#requestRemoveFocus(IFigure)
	 */
	public void requestRemoveFocus(IFigure fig) {
		if (getFocusOwner() == fig)
			setFocus(null);
		if (mouseTarget == fig)
			mouseTarget = null;
		if (cursorTarget == fig)
			cursorTarget = null;
		if (hoverSource == fig)
			hoverSource = null;
		getFocusTraverseManager().setCurrentFocusOwner(null);
	}

	/**
	 * @see EventDispatcher#setCapture(IFigure)
	 */
	protected void setCapture(IFigure figure) {
		captured = true;
		mouseTarget = figure;
	}

	/**
	 * @see EventDispatcher#setControl(Control)
	 */
	public void setControl(Control c) {
		if (c == control)
			return;
		if (control != null && !control.isDisposed())
			throw new RuntimeException(
					"Can not set control again once it has been set"); //$NON-NLS-1$
		if (c != null)
			c.addDisposeListener(new org.eclipse.swt.events.DisposeListener() {
				public void widgetDisposed(DisposeEvent e) {
					if (toolTipHelper != null)
						toolTipHelper.dispose();
				}
			});
		control = c;
	}

	/**
	 * Sets the mouse cursor.
	 * 
	 * @param c
	 *            the new cursor
	 */
	protected void setCursor(Cursor c) {
		if (c == null && cursor == null) {
			return;
		} else if ((c != cursor) || (!c.equals(cursor))) {
			cursor = c;
			if (control != null && !control.isDisposed())
				control.setCursor(c);
		}
	}

	/**
	 * Enables key traversal via TAB and ALT+TAB if traverse is
	 * true. Disables it otherwise.
	 * 
	 * @param traverse
	 *            whether key traversal should be enabled
	 */
	public void setEnableKeyTraversal(boolean traverse) {
		figureTraverse = traverse;
	}

	/**
	 * Sets the figure under the mouse cursor.
	 * 
	 * @param f
	 *            the new figure under the cursor
	 */
	protected void setFigureUnderCursor(IFigure f) {
		if (cursorTarget == f)
			return;
		cursorTarget = f;
		updateCursor();
	}

	/**
	 * Sets the focus figure. If the figure currently with focus is not
	 * null, {@link IFigure#handleFocusLost(FocusEvent)} is called
	 * on the current focused figure. If the new focus figure is not
	 * null, this will call
	 * {@link IFigure#handleFocusGained(FocusEvent)} on the new focused figure.
	 * 
	 * @param fig
	 *            the new focus figure
	 */
	protected void setFocus(IFigure fig) {
		if (fig == focusOwner)
			return;
		FocusEvent fe = new FocusEvent(focusOwner, fig);
		IFigure oldOwner = focusOwner;
		focusOwner = fig;
		if (oldOwner != null)
			oldOwner.handleFocusLost(fe);
		if (fig != null)
			getFocusTraverseManager().setCurrentFocusOwner(fig);
		if (focusOwner != null)
			focusOwner.handleFocusGained(fe);
	}

	/**
	 * Sets the figure that the mouse cursor is hovering over.
	 * 
	 * @param figure
	 *            the new hover source
	 * @param me
	 *            the mouse event
	 */
	protected void setHoverSource(Figure figure,
			org.eclipse.swt.events.MouseEvent me) {
		hoverSource = figure;
		if (figure != null) {
			Control control = (Control) me.getSource();
			org.eclipse.swt.graphics.Point absolute;
			absolute = control.toDisplay(new org.eclipse.swt.graphics.Point(
					me.x, me.y));
			toolTipHelper = getToolTipHelper();
			toolTipHelper.updateToolTip(hoverSource, getCurrentToolTip(),
					absolute.x, absolute.y);
		} else if (toolTipHelper != null) {
			// Update with null to clear hoverSource in ToolTipHelper
			toolTipHelper.updateToolTip(hoverSource, getCurrentToolTip(), me.x,
					me.y);
		}
	}

	/**
	 * Sets the given figure to be the target of future mouse events.
	 * 
	 * @param figure
	 *            the new mouse target
	 */
	protected void setMouseTarget(IFigure figure) {
		mouseTarget = figure;
	}

	/**
	 * @see EventDispatcher#setRoot(IFigure)
	 */
	public void setRoot(IFigure figure) {
		root = figure;
	}

	/**
	 * @see EventDispatcher#updateCursor()
	 */
	protected void updateCursor() {
		Cursor newCursor = null;
		if (cursorTarget != null)
			newCursor = cursorTarget.getCursor();
		setCursor(newCursor);
	}

	/**
	 * Updates the figure under the cursor, unless the mouse is captured, in
	 * which case all mouse events will be routed to the figure that captured
	 * the mouse.
	 * 
	 * @param me
	 *            the mouse event
	 */
	protected void updateFigureUnderCursor(org.eclipse.swt.events.MouseEvent me) {
		if (!captured) {
			IFigure f = root.findFigureAt(me.x, me.y);
			setFigureUnderCursor(f);
			if (cursorTarget != hoverSource)
				updateHoverSource(me);
		}
	}

	/**
	 * Updates the figure that will receive hover events. The hover source must
	 * have a tooltip. If the figure under the mouse doesn't have a tooltip set,
	 * this method will walk up the ancestor hierarchy until either a figure
	 * with a tooltip is found or it gets to the root figure.
	 * 
	 * @param me
	 *            the mouse event
	 */
	protected void updateHoverSource(org.eclipse.swt.events.MouseEvent me) {
		/*
		 * Derive source from figure under cursor. Set the source in
		 * setHoverSource(); If figure.getToolTip() is null, get parent's
		 * toolTip Continue parent traversal until a toolTip is found or root is
		 * reached.
		 */
		if (cursorTarget != null) {
			boolean sourceFound = false;
			Figure source = (Figure) cursorTarget;
			while (!sourceFound && source.getParent() != null) {
				if (source.getToolTip() != null)
					sourceFound = true;
				else
					source = (Figure) source.getParent();
			}
			setHoverSource(source, me);
		} else {
			setHoverSource(null, me);
		}
	}

}