001: /*
002: * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
003: *
004: * Copyright 1997-2007 Sun Microsystems, Inc. All rights reserved.
005: *
006: * The contents of this file are subject to the terms of either the GNU
007: * General Public License Version 2 only ("GPL") or the Common
008: * Development and Distribution License("CDDL") (collectively, the
009: * "License"). You may not use this file except in compliance with the
010: * License. You can obtain a copy of the License at
011: * http://www.netbeans.org/cddl-gplv2.html
012: * or nbbuild/licenses/CDDL-GPL-2-CP. See the License for the
013: * specific language governing permissions and limitations under the
014: * License. When distributing the software, include this License Header
015: * Notice in each file and include the License file at
016: * nbbuild/licenses/CDDL-GPL-2-CP. Sun designates this
017: * particular file as subject to the "Classpath" exception as provided
018: * by Sun in the GPL Version 2 section of the License file that
019: * accompanied this code. If applicable, add the following below the
020: * License Header, with the fields enclosed by brackets [] replaced by
021: * your own identifying information:
022: * "Portions Copyrighted [year] [name of copyright owner]"
023: *
024: * Contributor(s):
025: *
026: * The Original Software is NetBeans. The Initial Developer of the Original
027: * Software is Sun Microsystems, Inc. Portions Copyright 1997-2007 Sun
028: * Microsystems, Inc. All Rights Reserved.
029: *
030: * If you wish your version of this file to be governed by only the CDDL
031: * or only the GPL Version 2, indicate your decision by adding
032: * "[Contributor] elects to include this software in this distribution
033: * under the [CDDL or GPL Version 2] license." If you do not indicate a
034: * single choice of license, a recipient has the option to distribute
035: * your version of this file under either the CDDL, the GPL Version 2 or
036: * to extend the choice of license to its licensees as provided above.
037: * However, if you add GPL Version 2 code and therefore, elected the GPL
038: * Version 2 license, then the option applies only if the new code is
039: * made subject to such option by the copyright holder.
040: */
041: package org.netbeans.modules.visual.action;
042:
043: import org.netbeans.api.visual.action.WidgetAction;
044: import org.netbeans.api.visual.widget.Scene;
045: import org.netbeans.api.visual.widget.Widget;
046: import org.netbeans.modules.visual.util.GeomUtil;
047:
048: import javax.swing.*;
049: import java.awt.*;
050:
051: /**
052: * @author David Kaspar
053: */
054: public final class CenteredZoomAction extends WidgetAction.Adapter {
055:
056: private double zoomMultiplier;
057:
058: public CenteredZoomAction(double zoomMultiplier) {
059: this .zoomMultiplier = zoomMultiplier;
060: }
061:
062: public State mouseWheelMoved(Widget widget,
063: WidgetMouseWheelEvent event) {
064: Scene scene = widget.getScene();
065:
066: int modifiers = scene.getInputBindings()
067: .getZoomActionModifiers();
068: if ((event.getModifiers() & modifiers) != modifiers)
069: return State.REJECTED;
070:
071: int amount = event.getWheelRotation();
072:
073: double scale = 1.0;
074: while (amount > 0) {
075: scale /= zoomMultiplier;
076: amount--;
077: }
078: while (amount < 0) {
079: scale *= zoomMultiplier;
080: amount++;
081: }
082:
083: JComponent view = scene.getView();
084: if (view != null) {
085: Rectangle viewBounds = view.getVisibleRect();
086:
087: Point center = GeomUtil.center(viewBounds);
088: center = scene.convertViewToScene(center);
089:
090: scene.setZoomFactor(scale * scene.getZoomFactor());
091: scene.validate(); // HINT - forcing to change preferred size of the JComponent view
092:
093: center = scene.convertSceneToView(center);
094:
095: view.scrollRectToVisible(new Rectangle(center.x
096: - viewBounds.width / 2, center.y
097: - viewBounds.height / 2, viewBounds.width,
098: viewBounds.height));
099: } else
100: scene.setZoomFactor(scale * scene.getZoomFactor());
101:
102: return State.CONSUMED;
103: }
104:
105: }
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