/*******************************************************************************
* Copyright (c) 2009 the CHISEL group and contributors.
* 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:
* Del Myers -- initial API and implementation
*******************************************************************************/
package org.eclipse.zest.custom.sequence.tools;
import java.io.IOException;
import java.io.InputStream;
import org.eclipse.draw2d.ColorConstants;
import org.eclipse.draw2d.IFigure;
import org.eclipse.draw2d.LayeredPane;
import org.eclipse.draw2d.RectangleFigure;
import org.eclipse.draw2d.Viewport;
import org.eclipse.draw2d.geometry.Dimension;
import org.eclipse.draw2d.geometry.Point;
import org.eclipse.draw2d.geometry.Rectangle;
import org.eclipse.swt.SWT;
import org.eclipse.swt.events.MouseEvent;
import org.eclipse.swt.graphics.Cursor;
import org.eclipse.swt.graphics.ImageData;
import org.eclipse.swt.widgets.Display;
import org.eclipse.swt.widgets.Widget;
import org.eclipse.zest.custom.sequence.figures.RectangleZoomManager;
import org.eclipse.zest.custom.sequence.figures.internal.ZoomManager;
import org.eclipse.zest.custom.sequence.visuals.LayerConstants;
/**
* A tool that zooms in on a particular area of the view port and draws a rectangle
* to display that area.
* @author Del Myers
*/
public class ZoomToTool extends ZoomTool {
private boolean dragging;
private IFigure feedbackFigure;
private RectangleZoomManager zoomManager;
private IFigure feedbackParent;
private Point startPoint;
/* (non-Javadoc)
* @see org.eclipse.mylar.zest.custom.sequence.tools.ZoomTool#loadCursor(org.eclipse.swt.widgets.Display)
*/
@Override
protected Cursor loadCursor(Display display) throws IOException {
InputStream stream = getClass().getClassLoader().getResourceAsStream("cursors/magnifyscreen.png");
ImageData source = new ImageData(stream);
stream.close();
stream = getClass().getClassLoader().getResourceAsStream("cursors/magnifyrectmask.png");
ImageData mask = new ImageData(stream);
stream.close();
return new Cursor(display, source, mask, source.width/2, source.height/2);
}
/* (non-Javadoc)
* @see org.eclipse.mylar.zest.custom.sequence.tools.IWidgetTool#handleMouseDoubleClicked(org.eclipse.swt.events.MouseEvent, org.eclipse.swt.widgets.Widget, org.eclipse.draw2d.IFigure)
*/
public void handleMouseDoubleClicked(MouseEvent event, Widget widget,
IFigure cursorTarget) {
}
/* (non-Javadoc)
* @see org.eclipse.mylar.zest.custom.sequence.tools.IWidgetTool#handleMouseHover(org.eclipse.swt.events.MouseEvent, org.eclipse.swt.widgets.Widget, org.eclipse.draw2d.IFigure)
*/
public void handleMouseHover(MouseEvent me, Widget widget,
IFigure cursorTarget) {
}
/* (non-Javadoc)
* @see org.eclipse.mylar.zest.custom.sequence.tools.IWidgetTool#handleMouseMoved(org.eclipse.swt.events.MouseEvent, org.eclipse.swt.widgets.Widget, org.eclipse.draw2d.IFigure)
*/
public void handleMouseMoved(MouseEvent me, Widget widget,
IFigure cursorTarget) {
if ((me.stateMask & SWT.BUTTON1) == 0) {
//cancel the drawing.
clear();
} else if (dragging) {
updateFeedback(new Point(me.x, me.y));
}
}
/**
* Clears all data to stop or cancel the zooming.
*
*/
private void clear() {
this.dragging = false;
this.zoomManager = null;
this.feedbackParent = null;
this.startPoint = null;
eraseFeedback();
}
/* (non-Javadoc)
* @see org.eclipse.mylar.zest.custom.sequence.tools.IWidgetTool#handleMousePressed(org.eclipse.swt.events.MouseEvent, org.eclipse.swt.widgets.Widget, org.eclipse.draw2d.IFigure)
*/
public void handleMousePressed(MouseEvent me, Widget widget,
IFigure cursorTarget) {
if (me.button != 1) return;
this.dragging = true;
ZoomManager m = getZoomManager(me.widget);
if (!(m instanceof RectangleZoomManager)) {
return;
}
this.zoomManager = (RectangleZoomManager) m;
IFigure contentFigure = zoomManager.getScalableFigure();
if (contentFigure instanceof LayeredPane) {
this.feedbackParent = ((LayeredPane)contentFigure).getLayer(LayerConstants.FEEDBACK_LAYER);
}
if (this.feedbackParent == null) {
contentFigure = zoomManager.getViewport().getContents();
if (contentFigure instanceof LayeredPane) {
this.feedbackParent = ((LayeredPane)contentFigure).getLayer(LayerConstants.FEEDBACK_LAYER);
}
}
if (this.feedbackParent == null) {
//finally, just use the content figure
this.feedbackParent = zoomManager.getViewport().getContents();
}
Point p = new Point(me.x, me.y);
this.startPoint = p;
showFeedback();
}
/* (non-Javadoc)
* @see org.eclipse.mylar.zest.custom.sequence.tools.IWidgetTool#handleMouseReleased(org.eclipse.swt.events.MouseEvent, org.eclipse.swt.widgets.Widget, org.eclipse.draw2d.IFigure)
*/
public void handleMouseReleased(MouseEvent me, Widget widget,
IFigure cursorTarget) {
if (dragging) {
if (me.button == 1) {
if (zoomManager != null) {
if (getFeedbackFigure().getBounds().isEmpty()) {
zoomManager.setZoom(1.0);
} else {
zoomManager.zoomTo(getFeedbackFigure().getBounds());
}
}
clear();
}
}
}
/* (non-Javadoc)
* @see org.eclipse.mylar.zest.custom.sequence.tools.IWidgetTool#understandsEvent(org.eclipse.swt.events.MouseEvent, org.eclipse.swt.widgets.Widget, org.eclipse.draw2d.IFigure)
*/
public boolean understandsEvent(MouseEvent me, Widget widget,
IFigure cursorTarget) {
Object manager = getZoomManager(me.widget);
if ((manager instanceof RectangleZoomManager)) {
//make sure that the cursor target is a child of the zoom manager's
//viewport
this.zoomManager = (RectangleZoomManager) manager;
Viewport port = zoomManager.getViewport();
IFigure figure = cursorTarget;
while (figure != null) {
if (figure == port)
return true;
figure = figure.getParent();
}
}
return false;
}
private void showFeedback() {
IFigure feedback = getFeedbackFigure();
if (feedbackParent != null && feedback.getParent() != feedbackParent) {
feedbackParent.add(feedback);
Point p = startPoint.getCopy();
feedback.translateToRelative(p);
feedback.setLocation(p);
feedback.setSize(new Dimension(0,0));
}
}
private void updateFeedback(Point p) {
int x1, x2, y1, y2;
x1 = x2 = y1 = y2 = 0;
if (startPoint.x < p.x) {
x1 = startPoint.x;
x2 = p.x;
} else {
x1 = p.x;
x2 = startPoint.x;
}
if (startPoint.y < p.y) {
y1 = startPoint.y;
y2 = p.y;
} else {
y1 = p.y;
y2 = startPoint.y;
}
Rectangle newBounds = new Rectangle(x1, y1, x2-x1, y2-y1);
getFeedbackFigure().translateToRelative(newBounds);
getFeedbackFigure().setBounds(newBounds);
}
private void eraseFeedback() {
if (getFeedbackFigure().getParent() != null) {
getFeedbackFigure().getParent().remove(getFeedbackFigure());
}
this.feedbackParent = null;
}
private IFigure getFeedbackFigure() {
if (feedbackFigure == null) {
feedbackFigure = new RectangleFigure();
feedbackFigure.setForegroundColor(ColorConstants.blue);
((RectangleFigure)feedbackFigure).setFill(false);
}
return feedbackFigure;
}
}