Java tutorial
/******************************************************************************* * Copyright (c) 2006 IBM, Inc and Composent, 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: Chris Aniszczyk <zx@us.ibm.com> - initial API and implementation * Ken Gilmer <kgilmer@gmail.com> ******************************************************************************/ package org.eclipse.ecf.tutorial.scribbleshare; import java.io.ByteArrayInputStream; import java.io.ByteArrayOutputStream; import java.io.IOException; import java.io.ObjectInputStream; import java.io.ObjectOutputStream; import java.util.ArrayList; import java.util.Iterator; import java.util.List; import org.eclipse.ecf.datashare.IChannel; import org.eclipse.ecf.tutorial.scribbleshare.toolbox.AbstractTool; import org.eclipse.ecf.tutorial.scribbleshare.toolbox.Box; import org.eclipse.ecf.tutorial.scribbleshare.toolbox.DrawSettings; import org.eclipse.ecf.tutorial.scribbleshare.toolbox.Line; import org.eclipse.ecf.tutorial.scribbleshare.toolbox.ListContentProvider; import org.eclipse.ecf.tutorial.scribbleshare.toolbox.Oval; import org.eclipse.ecf.tutorial.scribbleshare.toolbox.Pencil; import org.eclipse.ecf.tutorial.scribbleshare.toolbox.ToolboxLabelProvider; import org.eclipse.jface.viewers.ISelectionChangedListener; import org.eclipse.jface.viewers.SelectionChangedEvent; import org.eclipse.jface.viewers.StructuredSelection; import org.eclipse.jface.viewers.TableViewer; import org.eclipse.swt.SWT; import org.eclipse.swt.events.ModifyEvent; import org.eclipse.swt.events.ModifyListener; import org.eclipse.swt.events.PaintEvent; import org.eclipse.swt.events.PaintListener; import org.eclipse.swt.events.SelectionEvent; import org.eclipse.swt.events.SelectionListener; import org.eclipse.swt.layout.GridData; import org.eclipse.swt.layout.GridLayout; import org.eclipse.swt.widgets.Button; import org.eclipse.swt.widgets.Canvas; import org.eclipse.swt.widgets.Composite; import org.eclipse.swt.widgets.Display; import org.eclipse.swt.widgets.Event; import org.eclipse.swt.widgets.Label; import org.eclipse.swt.widgets.Listener; import org.eclipse.swt.widgets.Text; import org.eclipse.ui.part.ViewPart; public class ScribbleView extends ViewPart { private Display display; private Canvas canvas; private AbstractTool currentTool; private DrawSettings drawSettings = new DrawSettings(); private List tools; // Default color is black int red = 0; int blue = 0; int green = 0; // Channel to send data on IChannel channel = null; public ScribbleView() { tools = new ArrayList(); } public void setUserColor(int red, int green, int blue) { this.red = red; this.green = green; this.blue = blue; } public void setChannel(IChannel channel) { this.channel = channel; } /** * This is called when a remote client calls <code>sendTool</code>. * * @param message */ public void handleDrawLine(byte[] message) { ByteArrayInputStream bins = new ByteArrayInputStream(message); // DataInputStream dins = new DataInputStream(bins); try { ObjectInputStream ois = new ObjectInputStream(bins); AbstractTool tool = (AbstractTool) ois.readObject(); // Apply the tool to the local canvas. tool.draw(canvas); tools.add(tool); } catch (IOException e1) { // TODO Auto-generated catch block e1.printStackTrace(); } catch (ClassNotFoundException e) { // TODO Auto-generated catch block e.printStackTrace(); } } protected void sendTool(AbstractTool tool) { if (channel != null && currentTool != null) { try { ByteArrayOutputStream bouts = new ByteArrayOutputStream(); // create a byte array from serialized Tool ObjectOutputStream douts = new ObjectOutputStream(bouts); douts.writeObject(tool); // send serialized tool to other clients. channel.sendMessage(bouts.toByteArray()); } catch (Exception e) { e.printStackTrace(); } } } public void createPartControl(Composite parent) { Composite backgroundComposite = new Composite(parent, SWT.NONE); GridLayout backgroundGridLayout = new GridLayout(3, false); backgroundGridLayout.marginHeight = 0; backgroundGridLayout.marginBottom = 0; backgroundGridLayout.marginLeft = 0; backgroundGridLayout.marginRight = 0; backgroundGridLayout.marginWidth = 0; backgroundGridLayout.horizontalSpacing = 0; backgroundComposite.setLayout(backgroundGridLayout); backgroundComposite.setLayoutData(new GridData(GridData.FILL_BOTH)); Composite paletteComposite = new Composite(backgroundComposite, SWT.NONE); backgroundGridLayout = new GridLayout(); backgroundGridLayout.marginHeight = 0; backgroundGridLayout.marginBottom = 0; backgroundGridLayout.marginLeft = 0; backgroundGridLayout.marginRight = 0; backgroundGridLayout.marginWidth = 0; backgroundGridLayout.horizontalSpacing = 0; paletteComposite.setLayout(backgroundGridLayout); GridData toolboxGridData = new GridData(GridData.FILL_VERTICAL); toolboxGridData.widthHint = 60; paletteComposite.setLayoutData(toolboxGridData); final TableViewer toolbox = new TableViewer(paletteComposite, SWT.FLAT | SWT.FULL_SELECTION); toolboxGridData = new GridData(GridData.FILL_BOTH); toolbox.getTable().setLayoutData(toolboxGridData); toolbox.setLabelProvider(new ToolboxLabelProvider()); toolbox.setContentProvider(new ListContentProvider()); toolbox.setInput(createTools()); toolbox.addSelectionChangedListener(new ISelectionChangedListener() { public void selectionChanged(SelectionChangedEvent event) { currentTool = (AbstractTool) ((StructuredSelection) toolbox.getSelection()).getFirstElement(); // Apply the drawSettings to the currently selected tool. currentTool.setDrawSettings(drawSettings); } }); // Create the UI widgets to modify the DrawSettings instance. createSettings(paletteComposite); Label separator = new Label(backgroundComposite, SWT.SEPARATOR | SWT.VERTICAL/* SWT.NONE */); separator.setLayoutData(new GridData(GridData.FILL_VERTICAL)); canvas = new Canvas(backgroundComposite, SWT.NONE); canvas.setLayoutData(new GridData(GridData.FILL_BOTH)); display = parent.getDisplay(); canvas.setBackground(display.getSystemColor(SWT.COLOR_WHITE)); canvas.addPaintListener(new PaintListener() { public void paintControl(PaintEvent e) { for (Iterator i = tools.iterator(); i.hasNext();) { AbstractTool at = (AbstractTool) i.next(); at.draw(canvas); } } }); Listener listener = new Listener() { public void handleEvent(Event event) { if (currentTool != null) { // Have the tool interpret the mouse events. currentTool.handleUIEvent(event, canvas); // If the tool interaction is complete, send the tool to // other clients for rendering. if (currentTool.isComplete()) { tools.add(currentTool); sendTool(currentTool); // Only do this once per Tool. currentTool.setComplete(false); } /*else { if (currentTool instanceof Pencil) { tools.add(currentTool); } }*/ } } }; canvas.addListener(SWT.MouseDown, listener); canvas.addListener(SWT.MouseMove, listener); canvas.addListener(SWT.MouseUp, listener); } private void createSettings(Composite paletteComposite) { // Size of Pen (drawWidth) set on the GC. { Label l = new Label(paletteComposite, SWT.NONE); l.setText("Pen Size"); final Text t = new Text(paletteComposite, SWT.BORDER); t.setLayoutData(new GridData(GridData.FILL_HORIZONTAL)); t.setText("1"); t.addModifyListener(new ModifyListener() { public void modifyText(ModifyEvent e) { drawSettings.setPenWidth(Integer.parseInt(t.getText())); currentTool.setDrawSettings(drawSettings); } }); } // Toggles the antialias property on the GC. { final Button b = new Button(paletteComposite, SWT.CHECK); b.setText("Antialias"); b.addSelectionListener(new SelectionListener() { public void widgetSelected(SelectionEvent e) { drawSettings.setAntialias(b.getSelection()); currentTool.setDrawSettings(drawSettings); } public void widgetDefaultSelected(SelectionEvent e) { } }); } } /** * Create the list of tools available to be used. Add new subclasses of * AbstractTool here. * * @return */ private List createTools() { List toolList = new ArrayList(); toolList.add(new Pencil()); toolList.add(new Box()); toolList.add(new Line()); toolList.add(new Oval()); return toolList; } public void setFocus() { canvas.setFocus(); } }