Attachment 286470 Details for Bug 570649 – Snippet that reproduces the bug

Snippet that reproduces the bug

SWTSnippet.java (text/plain), 1.90 KB, created by Mario Marinato

on 2021-05-28 07:18:50 EDT

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Creator: Mario Marinato

Created: 2021-05-28 07:18:50 EDT

Size: 1.90 KB

patch

obsolete

>package swtSnippet;
>
>import org.eclipse.swt.SWT;
>import org.eclipse.swt.layout.FillLayout;
>import org.eclipse.swt.opengl.GLCanvas;
>import org.eclipse.swt.opengl.GLData;
>import org.eclipse.swt.widgets.Canvas;
>import org.eclipse.swt.widgets.Display;
>import org.eclipse.swt.widgets.Event;
>import org.eclipse.swt.widgets.Shell;
>
>/**
> * This snippet serves two purposes:
> *
> * Demonstrate Eclipse Bug #573782 - https://bugs.eclipse.org/bugs/show_bug.cgi?id=573782 
> * On Eclipse 4.14, using a GLCanvas, it is not redrawn after paintControl runs.
> *
> * Demonstrate Eclipse Bug #570649 - https://bugs.eclipse.org/bugs/show_bug.cgi?id=570649 
> * On Eclipse 4.19, using a GLCanvas, it throws an error on the readAndDispatch call.
> *
> * When it runs correctly, it opens a Shell with a red line that moves around when you move your mouse over
> * the canvas.
> */
>public class SWTSnippet {
>
>	public static void main( String[] args ) {
>		Display display = new Display();
>		Shell shell = new Shell( display );
>		shell.setLayout( new FillLayout() );
>		shell.setBounds( 100, 100, 400, 400 );
>
>		// This does not work.
>		Canvas canvas = new GLCanvas( shell, SWT.NONE, new GLData() );
>
>		// This works.
>		// Canvas canvas = new Canvas( shell, SWT.NONE );
>
>		canvas.addListener( SWT.Paint, event -> handlePaint( event ) );
>		canvas.addListener( SWT.MouseMove, event -> canvas.redraw() );
>
>		shell.open();
>		while ( !shell.isDisposed() ) {
>			if ( !display.readAndDispatch() ) {
>				display.sleep();
>			}
>		}
>		display.dispose();
>	}
>
>	private static void handlePaint( Event event ) {
>		int xBegin = 10 + (int) ( Math.random() * 10 );
>		int xEnd = 390 - (int) ( Math.random() * 10 );
>		int yBegin = 10 + (int) ( Math.random() * 10 );
>		int yEnd = 350 - (int) ( Math.random() * 10 );
>
>		event.gc.setLineWidth( 3 );
>		event.gc.setForeground( Display.getDefault().getSystemColor( SWT.COLOR_RED ) );
>		event.gc.drawLine( xBegin, yBegin, xEnd, yEnd );
>	}
>}

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Attachments on bug 570649: 286470 | 288245