/**
* Copyright (c) 2008-2012 Ardor Labs, Inc.
*
* This file is part of Ardor3D.
*
* Ardor3D is free software: you can redistribute it and/or modify it
* under the terms of its license which may be found in the accompanying
* LICENSE file or at <http://www.ardor3d.com/LICENSE>.
*/
package com.ardor3d.input.swt;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Cursor;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.graphics.PaletteData;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.RGB;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Display;
import com.ardor3d.image.util.SWTImageUtil;
import com.ardor3d.input.GrabbedState;
import com.ardor3d.input.MouseCursor;
import com.ardor3d.input.MouseManager;
/**
* Implementation of the {@link com.ardor3d.input.MouseManager} interface for use with SWT. This implementation supports
* the optional {@link #setGrabbed(com.ardor3d.input.GrabbedState)} and {@link #setPosition(int, int)} methods. The
* constructor takes an SWT {@link org.eclipse.swt.widgets.Control} instance, for which the cursor is set. In a
* multi-canvas application, each canvas can have its own SwtMouseManager instance, or it is possible to use a single
* one for the SWT container that includes the control.
*/
public class SwtMouseManager implements MouseManager {
private static Cursor _transparentCursor;
private final Control _control;
/** our current grabbed state */
private GrabbedState _grabbedState;
/** Our cursor prior to a setGrabbed(GRABBED) operation. Stored to be used when cursor is "ungrabbed" */
private Cursor _pregrabCursor;
public SwtMouseManager(final Control control) {
_control = control;
}
public void setCursor(final MouseCursor cursor) {
if (cursor == MouseCursor.SYSTEM_DEFAULT) {
_control.setCursor(null);
return;
}
final ImageData imageData = SWTImageUtil.convertToSWT(cursor.getImage()).get(0);
final Cursor swtCursor = new Cursor(_control.getDisplay(), imageData, cursor.getHotspotX(), cursor
.getHotspotY());
_control.setCursor(swtCursor);
}
public void setPosition(final int x, final int y) {
final Point p = new Point(x, _control.getSize().y - y);
_control.getDisplay().setCursorLocation(_control.toDisplay(p));
}
public void setGrabbed(final GrabbedState grabbedState) {
if (!isSetGrabbedSupported()) {
throw new UnsupportedOperationException();
}
// check if we should be here.
if (_grabbedState == grabbedState) {
return;
}
// remember our grabbed state mode.
_grabbedState = grabbedState;
if (grabbedState == GrabbedState.GRABBED) {
// remember our old cursor
_pregrabCursor = _control.getCursor();
// set our cursor to be invisible
_control.setCursor(getTransparentCursor());
} else {
// restore our old cursor
_control.setCursor(_pregrabCursor);
}
}
private final Cursor getTransparentCursor() {
if (_transparentCursor == null) {
final Display display = _control.getDisplay();
final Color white = display.getSystemColor(SWT.COLOR_WHITE);
final Color black = display.getSystemColor(SWT.COLOR_BLACK);
final PaletteData palette = new PaletteData(new RGB[] { white.getRGB(), black.getRGB() });
final ImageData sourceData = new ImageData(16, 16, 1, palette);
sourceData.transparentPixel = 0;
_transparentCursor = new Cursor(display, sourceData, 0, 0);
}
return _transparentCursor;
}
public boolean isSetPositionSupported() {
return true;
}
public boolean isSetGrabbedSupported() {
return true;
}
public GrabbedState getGrabbed() {
return _grabbedState;
}
}