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:
047: import javax.swing.*;
048: import java.awt.*;
049:
050: /**
051: * @author David Kaspar
052: */
053: public final class MouseCenteredZoomAction extends WidgetAction.Adapter {
054:
055: private double zoomMultiplier;
056:
057: public MouseCenteredZoomAction(double zoomMultiplier) {
058: this .zoomMultiplier = zoomMultiplier;
059: }
060:
061: public State mouseWheelMoved(Widget widget,
062: WidgetMouseWheelEvent event) {
063: Scene scene = widget.getScene();
064:
065: int modifiers = scene.getInputBindings()
066: .getZoomActionModifiers();
067: if ((event.getModifiers() & modifiers) != modifiers)
068: return State.REJECTED;
069:
070: int amount = event.getWheelRotation();
071:
072: double scale = 1.0;
073: while (amount > 0) {
074: scale /= zoomMultiplier;
075: amount--;
076: }
077: while (amount < 0) {
078: scale *= zoomMultiplier;
079: amount++;
080: }
081:
082: JComponent view = scene.getView();
083: if (view != null) {
084: Rectangle viewBounds = view.getVisibleRect();
085:
086: Point center = widget.convertLocalToScene(event.getPoint());
087: Point mouseLocation = scene.convertSceneToView(center);
088:
089: scene.setZoomFactor(scale * scene.getZoomFactor());
090: scene.validate(); // HINT - forcing to change preferred size of the JComponent view
091:
092: center = scene.convertSceneToView(center);
093:
094: view.scrollRectToVisible(new Rectangle(center.x
095: - (mouseLocation.x - viewBounds.x), center.y
096: - (mouseLocation.y - viewBounds.y),
097: viewBounds.width, viewBounds.height));
098: } else
099: scene.setZoomFactor(scale * scene.getZoomFactor());
100:
101: return State.CONSUMED;
102: }
103:
104: }
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