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FigureCanvas.java
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FigureCanvas.java
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/*******************************************************************************
* Copyright (c) 2011 Google, Inc.
* 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:
* Google, Inc. - initial API and implementation
*******************************************************************************/
package org.eclipse.wb.internal.draw2d;
import org.eclipse.wb.draw2d.Figure;
import org.eclipse.wb.draw2d.Graphics;
import org.eclipse.wb.draw2d.geometry.Dimension;
import org.eclipse.wb.draw2d.geometry.Rectangle;
import org.eclipse.wb.internal.draw2d.scroll.HorizontalScrollModel;
import org.eclipse.wb.internal.draw2d.scroll.ScrollModel;
import org.eclipse.wb.internal.draw2d.scroll.VerticalScrollModel;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.swt.widgets.Event;
import org.eclipse.swt.widgets.Listener;
/**
* A Canvas that contains {@link Figure Figures}.
*
* @author lobas_av
* @coverage gef.draw2d
*/
public class FigureCanvas extends Canvas {
private RootFigure m_rootFigure;
private final Dimension m_rootPreferredSize = new Dimension();
private ScrollModel m_horizontalModel;
private ScrollModel m_verticalModel;
private Image m_bufferedImage;
private boolean m_drawCached;
////////////////////////////////////////////////////////////////////////////
//
// Constructor
//
////////////////////////////////////////////////////////////////////////////
public FigureCanvas(Composite parent, int style) {
super(parent, style | SWT.NO_BACKGROUND | SWT.NO_REDRAW_RESIZE);
// initialize scroll begin state
initScrolling();
// add all listeners
hookControlEvents();
// create root figure
createRootFigure();
}
////////////////////////////////////////////////////////////////////////////
//
// FigureCanvas
//
////////////////////////////////////////////////////////////////////////////
private void initScrolling() {
m_horizontalModel = new HorizontalScrollModel(this);
m_verticalModel = new VerticalScrollModel(this);
}
private void createRootFigure() {
m_rootFigure = new RootFigure(this, new RefreshManager(this));
m_rootFigure.setBackground(getBackground());
m_rootFigure.setForeground(getForeground());
m_rootFigure.setFont(getFont());
setDefaultEventManager();
}
protected void setDefaultEventManager() {
m_rootFigure.setEventManager(new EventManager(this));
}
private void disposeBufferedImage() {
if (m_bufferedImage != null) {
m_bufferedImage.dispose();
m_bufferedImage = null;
}
}
////////////////////////////////////////////////////////////////////////////
//
// Access
//
////////////////////////////////////////////////////////////////////////////
/**
* Returns the {@link ScrollModel} what support the horizontal scrolling.
*/
public ScrollModel getHorizontalScrollModel() {
return m_horizontalModel;
}
/**
* Returns the {@link ScrollModel} what support the vertical scrolling.
*/
public ScrollModel getVerticalScrollModel() {
return m_verticalModel;
}
/**
* Returns figures container.
*/
public RootFigure getRootFigure() {
return m_rootFigure;
}
/**
* Sets draw cached mode.
*/
public void setDrawCached(boolean value) {
m_drawCached = value;
}
////////////////////////////////////////////////////////////////////////////
//
// Control
//
////////////////////////////////////////////////////////////////////////////
@Override
public Point computeSize(int wHint, int hHint, boolean changed) {
Dimension size = m_rootFigure.getPreferredSize().getUnioned(wHint, hHint);
return new Point(size.width, size.height);
}
////////////////////////////////////////////////////////////////////////////
//
// Handle events
//
////////////////////////////////////////////////////////////////////////////
private void hookControlEvents() {
addListener(SWT.Dispose, new Listener() {
@Override
public void handleEvent(Event event) {
disposeBufferedImage();
}
});
addListener(SWT.Resize, new Listener() {
@Override
public void handleEvent(Event event) {
handleResize();
}
});
addListener(SWT.Paint, new Listener() {
@Override
public void handleEvent(Event event) {
handlePaint(event.gc, event.x, event.y, event.width, event.height);
}
});
}
private void handleResize() {
disposeBufferedImage();
configureScrollingAndRedraw();
}
private void handlePaint(GC paintGC, int x, int y, int width, int height) {
// check draw cached mode
if (m_drawCached) {
if (m_bufferedImage == null) {
paintGC.fillRectangle(x, y, width, height);
} else {
paintGC.drawImage(m_bufferedImage, 0, 0);
}
return;
}
// check double buffered image
if (m_bufferedImage == null) {
Point size = getSize();
m_bufferedImage = new Image(null, size.x, size.y);
}
// prepare double buffered Graphics
GC bufferedGC = new GC(m_bufferedImage);
try {
bufferedGC.setClipping(x, y, width, height);
bufferedGC.setBackground(paintGC.getBackground());
bufferedGC.setForeground(paintGC.getForeground());
bufferedGC.setFont(paintGC.getFont());
bufferedGC.setLineStyle(paintGC.getLineStyle());
bufferedGC.setLineWidth(paintGC.getLineWidth());
bufferedGC.setXORMode(paintGC.getXORMode());
// draw content
Graphics graphics = new Graphics(bufferedGC);
graphics.translate(-m_horizontalModel.getSelection(), -m_verticalModel.getSelection());
m_rootFigure.paint(graphics);
} finally {
bufferedGC.dispose();
}
// flush painting
paintGC.drawImage(m_bufferedImage, 0, 0);
}
private void configureScrollingAndRedraw() {
// cache figures preferred size
m_rootPreferredSize.setSize(m_rootFigure.getPreferredSize());
// get client area
org.eclipse.swt.graphics.Rectangle clientArea = getClientArea();
// set new figures bounds (thereof or resize window or resize/relocate figure)
m_rootFigure.setBounds(new Rectangle(clientArea).setLocation(0, 0));
// configure horizontal and vertical scroll bar's
m_horizontalModel.configure(clientArea.width, m_rootPreferredSize.width);
m_verticalModel.configure(clientArea.height, m_rootPreferredSize.height);
// set repaint
redraw();
}
/**
* Check bounds and reconfigure scroll bar's if needed and repaint client area.
*/
public void handleRefresh(int x, int y, int width, int height) {
if (m_rootPreferredSize.equals(m_rootFigure.getPreferredSize())) {
// calculate paint area
Point size = getSize();
Rectangle paintArea = new Rectangle(0, 0, size.x, size.y);
paintArea.intersect(new Rectangle(x, y, width, height));
// set repaint
redraw(paintArea.x, paintArea.y, paintArea.width, paintArea.height, true);
} else {
configureScrollingAndRedraw();
}
}
}