/*******************************************************************************
* CogTool Copyright Notice and Distribution Terms
* CogTool 1.3, Copyright (c) 2005-2013 Carnegie Mellon University
* This software is distributed under the terms of the FSF Lesser
* Gnu Public License (see LGPL.txt).
*
* CogTool is free software; you can redistribute it and/or modify
* it under the terms of the GNU Lesser General Public License as published by
* the Free Software Foundation; either version 2.1 of the License, or
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*
* CogTool 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 Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public License
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* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*
* CogTool makes use of several third-party components, with the
* following notices:
*
* Eclipse SWT version 3.448
* Eclipse GEF Draw2D version 3.2.1
*
* Unless otherwise indicated, all Content made available by the Eclipse
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*
* CLISP version 2.38
*
* Copyright (c) Sam Steingold, Bruno Haible 2001-2006
* This software is distributed under the terms of the FSF Gnu Public License.
* See COPYRIGHT file in clisp installation folder for more information.
*
* ACT-R 6.0
*
* Copyright (c) 1998-2007 Dan Bothell, Mike Byrne, Christian Lebiere &
* John R Anderson.
* This software is distributed under the terms of the FSF Lesser
* Gnu Public License (see LGPL.txt).
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* Apache Jakarta Commons-Lang 2.1
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* This product contains software developed by the Apache Software Foundation
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* jopt-simple version 1.0
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* Copyright (c) 2004-2013 Paul R. Holser, Jr.
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* Mozilla XULRunner 1.9.0.5
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******************************************************************************/
package edu.cmu.cs.hcii.cogtool.util;
import org.eclipse.draw2d.Figure;
import org.eclipse.draw2d.IFigure;
import org.eclipse.draw2d.InputEvent;
import org.eclipse.draw2d.KeyEvent;
import org.eclipse.draw2d.KeyListener;
import org.eclipse.draw2d.MouseEvent;
import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
/**
* Utility to support mouse interactions that might lead to
* popping up a context menu in a Draw2D environment.
*
* @author mlh
*/
public class Draw2DContextMenuUtil
{
/**
* An interface that may be subclassed to react to events
* that might lead to popping up a context menu in a Draw2D environment.
*
* @author mlh
*/
public interface MenuListener extends Listener,
KeyListener,
IFlatDraw2DMouseListener,
org.eclipse.swt.events.MouseListener
{
}
/**
* A default implementation of the <code>MenuListener</code> interface
* that does nothing for each possible event type.
* <p>
* In SWT/Draw2D, the sequence of events on the Mac for a "menu click"
* is: MENU-DETECT, MOUSE-DOWN, MOUSE-UP. Thus, on a Mac, a context menu
* should be popped in the handleEvent method, always with the current
* x, y position.
* <p>
* On a Windows PC, the "menu click" sequence is:
* MOUSE-DOWN, MENU-DETECT, MOUSE-UP. Thus, on a PC, a context menu should
* also be popped in the handleEvent method, but should check the state
* of "isMenuClick" to decide whether to use the current x, y position
* or to assume that the "context menu key" was used.
*
* SHOULD REPLACE Listener WITH MenuDetectListener WHEN IT EXISTS!
*
* @author mlh
*/
public static class MenuListenerAdapter implements MenuListener
{
// Used on Windows PC's to decide between positional context menu
// vs. "context menu key" invocation.
// NOTE HOWEVER: Positional context menu only occurs in the Draw2D
// portion of the UI!
protected boolean isMenuClick = false;
// Force subclasses to implement the N-argument versions
public final void mousePressed(MouseEvent me)
{
mousePressed((IFigure) me.getSource(),
me.button, me.x, me.y, me.getState());
}
public final void mouseReleased(MouseEvent me)
{
mouseReleased((IFigure) me.getSource(),
me.button, me.x, me.y, me.getState());
}
public final void mouseDoubleClicked(MouseEvent me)
{
mouseDoubleClicked((IFigure) me.getSource(),
me.button, me.x, me.y, me.getState());
}
public void mousePressed(IFigure figure,
int button, int x, int y, int state)
{
isMenuClick = isContextMenu(button, state);
}
public void mouseReleased(IFigure figure,
int button, int x, int y, int state)
{
// Reset state for context menu; it happened already!
isMenuClick = false;
}
public void mouseDoubleClicked(IFigure figure,
int button, int x, int y, int state) { }
public void keyPressed(KeyEvent ke) { }
public void keyReleased(KeyEvent ke) { }
public void handleEvent(Event evt) { }
public void mouseDoubleClick(org.eclipse.swt.events.MouseEvent evt) { }
public void mouseDown(org.eclipse.swt.events.MouseEvent evt) { }
public void mouseUp(org.eclipse.swt.events.MouseEvent evt) { }
}
/**
* A default implementation of the <code>MenuListener</code> interface
* that does nothing for each possible event type.
*
* @author mlh
*/
public static class MenuMotionListenerAdapter
extends MenuListenerAdapter
implements IFlatDraw2DMouseMotionListener
{
public void mouseDragged(IFigure figure,
int button, int x, int y, int state) { }
public void mouseEntered(IFigure figure, int x, int y, int state) { }
public void mouseExited(IFigure figure, int x, int y, int state) { }
public void mouseHover(IFigure figure, int x, int y, int state) { }
public void mouseMoved(IFigure figure, int x, int y, int state) { }
// Translate MouseEvent calls to IFigure-based calls; force their use
public final void mouseDragged(MouseEvent me)
{
mouseDragged((IFigure) me.getSource(),
me.button, me.x, me.y, me.getState());
}
public final void mouseEntered(MouseEvent me)
{
mouseEntered((IFigure) me.getSource(), me.x, me.y, me.getState());
}
public final void mouseExited(MouseEvent me)
{
mouseExited((IFigure) me.getSource(), me.x, me.y, me.getState());
}
public final void mouseHover(MouseEvent me)
{
mouseHover((IFigure) me.getSource(), me.x, me.y, me.getState());
}
public final void mouseMoved(MouseEvent me)
{
mouseMoved((IFigure) me.getSource(), me.x, me.y, me.getState());
}
}
/**
* Utility to determine which modifier mask to use
* to open the context menu on a mouse click for Draw2D
*
* @return the modifier key mask to determine if a mouse click
* indicates the need to pop a context menu in a Draw2D environment
*/
public static int platformContextKey()
{
if (OSUtils.MACOSX) {
return InputEvent.CONTROL;
}
return SWT.NONE;
}
/**
* Utility to determine if the given Draw2D mouse event represents
* a request to pop a context menu. The determination is OS specific.
*
* @param me the Draw2D mouse event
* @return true if and only if the event should be interpreted as
* a request to pop a context menu
* @author mlh
*/
public static boolean isContextMenu(MouseEvent me)
{
return isContextMenu(me.button, me.getState());
}
/**
* Utility to determine if the given Draw2D mouse event represents
* a potential request to pop a context menu.
* The determination is OS specific.
*
* @param button the button pressed/released of the mouse event
* @param state the shift key state mask of the mouse event
* @return true if and only if the event should be interpreted as
* a request to pop a context menu
* @author mlh
*/
public static boolean isContextMenu(int button, int state)
{
if (OSUtils.MACOSX) {
// Return true if a left control-click or right mouse button,
// and a down-click
return (((button == 3) // either right button
|| ((button == 1) // or left control-click
&& ((state & platformContextKey()) != 0))));
}
// assuming Windows; only a right click
return (button == 3);
}
/**
* Utility to register the given event listener on the given
* control and figure.
*
* @param c the control on which to register the listener
* @param f the figure on which to register the listener
* @param listener the event listener to register
* @author mlh
*/
public static void addMenuListener(Control c,
Figure f,
MenuListener listener)
{
c.addListener(SWT.MenuDetect, listener);
c.addMouseListener(listener);
f.addKeyListener(listener);
f.addMouseListener(listener);
}
}