[jbosstools-issues] [JBoss JIRA] (ERT-765) [GTK] Nothing is rendered when creating new GC on canvas [EBZ#551982]

[Eric Williams (Jira)]

     [ https://issues.jboss.org/browse/ERT-765?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Eric Williams resolved ERT-765.
-------------------------------
    Resolution: Done


> [GTK] Nothing is rendered when creating new GC on canvas [EBZ#551982]
> ---------------------------------------------------------------------
>
>                 Key: ERT-765
>                 URL: https://issues.jboss.org/browse/ERT-765
>             Project: Eclipse Release Train
>          Issue Type: Task
>          Components: Platform
>            Reporter: Friendly Jira Robot
>            Assignee: Eric Williams
>            Priority: Major
>              Labels: 4.14_M3, SWT, bzira
>
> This is example from http://www.java2s.com/Tutorial/Java/0300__SWT-2D-Graphics/Graphics.htm
> It shows empty window when run on Ubuntu 18.04 with open jdk 1.8
> Mac and Windows works fine.
> Also works if use e.gc instead of new GC(...)
> It used to work before
> Swt used
> org.eclipse.swt.gtk.linux.x86_64_3.111.0.v20190605-1801.jar
> import org.eclipse.swt.SWT;
> import org.eclipse.swt.events.PaintEvent;
> import org.eclipse.swt.events.PaintListener;
> import org.eclipse.swt.graphics.GC;
> import org.eclipse.swt.layout.FillLayout;
> import org.eclipse.swt.widgets.Canvas;
> import org.eclipse.swt.widgets.Display;
> import org.eclipse.swt.widgets.Shell;
> public class GCCreateFrom {
> 	public static void main(String[] args) {
> 		Display display = new Display();
> 		Shell shell = new Shell(display);
> 		shell.setText("Canvas Example");
> 		shell.setLayout(new FillLayout());
> 		final Canvas canvas = new Canvas(shell, SWT.NONE);
> 		canvas.addPaintListener(new PaintListener() {
> 			@Override
> 			public void paintControl(PaintEvent e) {
> 				GC gc = new GC(canvas);
> 				gc.setForeground(e.display.getSystemColor(SWT.COLOR_RED));
> 				gc.drawFocus(5, 5, 200, 10);
> 				gc.drawText("You can draw text directly on a canvas", 60, 60);
> 				gc.dispose();
> 			}
> 		});
> 		shell.open();
> 		while (!shell.isDisposed()) {
> 			if (!display.readAndDispatch()) {
> 				display.sleep();
> 			}
> 		}
> 		display.dispose();
> 	}
> }



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