Getting Started with Eclipse RCP Developer Study Notes - 05.2D Drawing

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Study: http://www.blogjava.net/youxia/archive/2006/12/01/84855.html

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1. New View CanvasView:

package hellorcp.canvas;

import org.eclipse.swt.SWT;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.ui.part.ViewPart;

public class CanvasView extends ViewPart {
        public Canvas canvas;

        @Override
        public void createPartControl(Composite parent) {
                // TODO  Automatically generate method stub  
                canvas = new Canvas(parent, SWT.NONE);
        }

        @Override
        public void setFocus() {
                // TODO  Automatically generate method stub  
        }

}

2. Draw an oval menu DrawOvalAction:

package hellorcp.canvas;

import org.eclipse.jface.action.IAction;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.swt.graphics.GC;
import org.eclipse.ui.IViewPart;
import org.eclipse.ui.IViewReference;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.IWorkbenchWindowActionDelegate;

public class DrawOvalAction implements IWorkbenchWindowActionDelegate {

        IWorkbenchWindow window;

        public void dispose() {
                // TODO Auto-generated method stub

        }

        public void init(IWorkbenchWindow arg0) {
                this.window = arg0;
        }

        public void run(IAction arg0) {
                IViewReference[] vfs = window.getActivePage().getViewReferences();
                IViewPart vw;
                for (int i = 0; i < vfs.length; i++) {
                        vw = vfs[i].getView(false);
                        if (vw.getTitle().equals(" Paint  ")) {
                                GC gc = new GC(((CanvasView) vw).canvas);
                                gc.drawOval(80, 50, 100, 100);
                                gc.dispose();
                        }
                }
        }

        public void selectionChanged(IAction arg0, ISelection arg1) {
                // TODO Auto-generated method stub
        }

}

3. Perspective.java amended as follows:

package hellorcp;

import org.eclipse.ui.IPageLayout;
import org.eclipse.ui.IPerspectiveFactory;

public class Perspective implements IPerspectiveFactory {

        public void createInitialLayout(IPageLayout layout) {
                // FirstView
                String editorArea = layout.getEditorArea();
//              layout.addView("hellorcp.view.FirstView", IPageLayout.RIGHT, 0.2f,
//                              editorArea);

                // SecondView
//              layout.setEditorAreaVisible(false);
//              layout.addView("hellorcp.view.SecondView", IPageLayout.RIGHT, 0.5f,
//                              editorArea);
                
                // OleView
//              layout.addView("hellorcp.ole.OleView", IPageLayout.RIGHT, 0.5f,
//                              editorArea);
                
                // CanvasView
                layout.addView("hellorcp.canvas.CanvasView", IPageLayout.RIGHT, 0.5f,
                                editorArea);
        }

}

4. Configuration plugin.xml, fragments are as follows:

1) action:

                   <action
                                class ="hellorcp.canvas.DrawOvalAction" 
                icon ="icons/alt_window_16.gif" 
                id ="hellorcp.canvas.DrawOvalAction" 
                    label =" Drawing an ellipse  " 
                                menubarPath ="hellorcp.firstmenu/additions" 
                style ="push" 
                toolbarPath ="additions" 
                tooltip =" Drawing an ellipse  " /> 

2) view:

         <view
               
               
                name=" Paint  " />

5. To save, run, the effect is as follows:



6. Draw a rectangle, gradient rectangle, Photo:

1) Rectangular action:

package hellorcp.canvas;

import org.eclipse.jface.action.IAction;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.swt.graphics.GC;
import org.eclipse.ui.IViewPart;
import org.eclipse.ui.IViewReference;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.IWorkbenchWindowActionDelegate;

public class DrawRectAction implements IWorkbenchWindowActionDelegate {

        IWorkbenchWindow window;

        public void dispose() {
                // TODO Auto-generated method stub

        }

        public void init(IWorkbenchWindow arg0) {
                this.window = arg0;
        }

        public void run(IAction arg0) {
                IViewReference[] vfs = window.getActivePage().getViewReferences();
                IViewPart vw;
                for (int i = 0; i < vfs.length; i++) {
                        vw = vfs[i].getView(false);
                        if (vw.getTitle().equals(" Paint  ")) {
                                GC gc = new GC(((CanvasView) vw).canvas);
                                gc.drawRectangle(280, 50, 100, 100);
                                gc.dispose();
                        }
                }
        }

        public void selectionChanged(IAction arg0, ISelection arg1) {
                // TODO Auto-generated method stub
        }

}

2) The gradient rectangle action:

package hellorcp.canvas;

import org.eclipse.jface.action.IAction;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.swt.SWT;
import org.eclipse.swt.graphics.GC;
import org.eclipse.ui.IViewPart;
import org.eclipse.ui.IViewReference;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.IWorkbenchWindowActionDelegate;

public class DrawGradientAction implements IWorkbenchWindowActionDelegate {

        IWorkbenchWindow window;

        public void dispose() {
                // TODO Auto-generated method stub

        }

        public void init(IWorkbenchWindow arg0) {
                this.window = arg0;
        }

        public void run(IAction arg0) {
                IViewReference[] vfs = window.getActivePage().getViewReferences();
                IViewPart vw;
                for (int i = 0; i < vfs.length; i++) {
                        vw = vfs[i].getView(false);
                        if (vw.getTitle().equals(" Paint  ")) {
                                GC gc = new GC(((CanvasView) vw).canvas);
                                gc.setBackground(window.getShell().getDisplay().getSystemColor(
                                                SWT.COLOR_BLUE));
                                gc.fillGradientRectangle(80, 200, 100, 100, false);
                                gc.dispose();
                        }
                }
        }

        public void selectionChanged(IAction arg0, ISelection arg1) {
                // TODO Auto-generated method stub
        }

}

3) Picture action:

package hellorcp.canvas;

import org.eclipse.jface.action.IAction;
import org.eclipse.jface.viewers.ISelection;
import org.eclipse.swt.graphics.GC;
import org.eclipse.swt.graphics.Image;
import org.eclipse.ui.IViewPart;
import org.eclipse.ui.IViewReference;
import org.eclipse.ui.IWorkbenchWindow;
import org.eclipse.ui.IWorkbenchWindowActionDelegate;

public class DrawImageAction implements IWorkbenchWindowActionDelegate {

        IWorkbenchWindow window;

        public void dispose() {
                // TODO Auto-generated method stub

        }

        public void init(IWorkbenchWindow arg0) {
                this.window = arg0;
        }

        public void run(IAction arg0) {
                IViewReference[] vfs = window.getActivePage().getViewReferences();
                IViewPart vw;
                for (int i = 0; i < vfs.length; i++) {
                        vw = vfs[i].getView(false);
                        if (vw.getTitle().equals(" Paint  ")) {
                                GC gc = new GC(((CanvasView) vw).canvas);
                                Image img = new Image(window.getShell().getDisplay(), "E:\\develop\\RCP\\HelloRCP\\splash.bmp");
                                gc.drawImage(img, 280, 200);
                                gc.dispose();
                        }
                }
        }

        public void selectionChanged(IAction arg0, ISelection arg1) {
                // TODO Auto-generated method stub
        }

}

4) action configuration:

                   <action
                                class ="hellorcp.canvas.DrawRectAction" 
                icon ="icons/alt_window_16.gif" 
                id ="hellorcp.canvas.DrawRectAction" 
                    label =" Draw a rectangle  " 
                                menubarPath ="hellorcp.firstmenu/additions" 
                style ="push" 
                toolbarPath ="additions" 
                tooltip =" Draw a rectangle  " /> 
                <action
                                class ="hellorcp.canvas.DrawGradientAction" 
                icon ="icons/alt_window_16.gif" 
                id ="hellorcp.canvas.DrawGradientAction" 
                    label =" Draw a gradient rectangles  " 
                                menubarPath ="hellorcp.firstmenu/additions" 
                style ="push" 
                toolbarPath ="additions" 
                tooltip =" Draw a gradient rectangles  " /> 
                <action
                                class ="hellorcp.canvas.DrawImageAction" 
                icon ="icons/alt_window_16.gif" 
                id ="hellorcp.canvas.DrawImageAction" 
                    label =" Drawn pictures  " 
                                menubarPath ="hellorcp.firstmenu/additions" 
                style ="push" 
                toolbarPath ="additions" 
                tooltip =" Drawn pictures  " /> 

5) Save and run, the effect is as follows:



7. Add the Paint event listener (settlement of the window minimized or obscured by another window, the graphics will go away), the modified CanvasView:

package hellorcp.canvas;

import org.eclipse.swt.SWT;
import org.eclipse.swt.events.PaintEvent;
import org.eclipse.swt.events.PaintListener;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.widgets.Canvas;
import org.eclipse.swt.widgets.Composite;
import org.eclipse.ui.PlatformUI;
import org.eclipse.ui.part.ViewPart;

public class CanvasView extends ViewPart {
        public Canvas canvas;

        @Override
        public void createPartControl(Composite parent) {
                // TODO  Automatically generate method stub  
                canvas = new Canvas(parent, SWT.NONE);

                //  Increase Paint listener  , Avoid window changes disappear after drawing  
                canvas.addPaintListener(new PaintListener() {
                        public void paintControl(PaintEvent e) {
                                //  Draws an ellipse  
                                e.gc.drawOval(80, 50, 100, 100);
                                //  Draw a rectangle  
                                e.gc.drawRectangle(280, 50, 100, 100);
                                //  To draw a gradient rectangles  
                                e.gc.setBackground(PlatformUI.getWorkbench().getDisplay()
                                                .getSystemColor(SWT.COLOR_BLUE));
                                e.gc.fillGradientRectangle(80, 200, 100, 100, false);
                                //  Draw graphics  
                                Image img = new Image(PlatformUI.getWorkbench().getDisplay(),
                                                "E:\\develop\\RCP\\HelloRCP\\splash.bmp");
                                e.gc.drawImage(img, 280, 200);
                        }
                });
        }

        @Override
        public void setFocus() {
                // TODO  Automatically generate method stub  
        }

}

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