Attachment 282551 Details for Bug 562463 – A simple example to test

A simple example to test

BusyIndicatorIssue.java (text/x-java), 3.38 KB, created by Oleksandr Mytrofanov

on 2020-04-24 08:04:13 EDT

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Filename:

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Creator: Oleksandr Mytrofanov

Created: 2020-04-24 08:04:13 EDT

Size: 3.38 KB

patch

obsolete

>import org.eclipse.swt.SWT;
>import org.eclipse.swt.custom.BusyIndicator;
>import org.eclipse.swt.graphics.Cursor;
>import org.eclipse.swt.layout.RowLayout;
>import org.eclipse.swt.widgets.*;
>
>public class BusyIndicatorIssue {
>	
>	// start copy-past from original BussyIndicator class
>	static int nextBusyId = 1;
>	static final String BUSYID_NAME = "SWT BusyIndicator"; //$NON-NLS-1$
>	static final String BUSY_CURSOR = "SWT BusyIndicator Cursor"; //$NON-NLS-1$
>	// end copy-past from original BussyIndicator class
>	
>	private static class Task implements Runnable {
>		
>		private String description;
>		
>		Task(String description){
>			this.description = description;
>		}
>		
>        @Override
>        public void run() {
>        	System.out.printf("A task %s has started\n", description);
>        	for (int i = 0; i < 40; i++) {
>        		try {
>					Thread.sleep(100);
>				} catch (InterruptedException e) {
>					e.printStackTrace();
>				}
>        	}
>        	System.out.printf("A task %s has ended\n", description);
>
>        }
>	};
>
>    public static void main (String [] args) {
>        Display display = new Display();
>        Shell shell = new Shell(display);
>        shell.setLayout(new RowLayout(SWT.HORIZONTAL));
>        Button b1 = new Button(shell, SWT.NONE);
>        b1.setText("Run task with default BusyIndicator...");
>        b1.addListener(SWT.Selection, new Listener() {
>        	@Override
>            public void handleEvent(Event event){
>                BusyIndicator.showWhile(display, new Task("without a spinning cursor"));
>            }
>        });
>        Button b2 = new Button(shell, SWT.NONE);
>        b2.setText("Run task with updated BusyIndicator...");
>        b2.addListener(SWT.Selection, new Listener() {
>            @Override
>            public void handleEvent(Event event){
>                showWhile(display, new Task("with a spinning cursor"));
>            }
>        });
>        shell.pack();
>        shell.open ();
>        while (!shell.isDisposed ()) {
>            if (!display.readAndDispatch ()) display.sleep ();
>        }
>        shell.dispose();
>        display.dispose ();
>    }
>    
>    // start copy-past from BussyIndicator class
>    
>    public static void showWhile(Display display, Runnable runnable) {
>		if (runnable == null)
>			SWT.error(SWT.ERROR_NULL_ARGUMENT);
>		if (display == null) {
>			display = Display.getCurrent();
>			if (display == null) {
>				runnable.run();
>				return;
>			}
>		}
>
>		Integer busyId = Integer.valueOf(nextBusyId);
>		nextBusyId++;
>		Cursor cursor = display.getSystemCursor(SWT.CURSOR_WAIT);
>		Shell[] shells = display.getShells();
>		for (Shell shell : shells) {
>			Integer id = (Integer)shell.getData(BUSYID_NAME);
>			if (id == null) {
>				setCursorAndId(shell, cursor, busyId);
>			}
>		}
>
>		try {
>			runnable.run();
>		} finally {
>			shells = display.getShells();
>			for (Shell shell : shells) {
>				Integer id = (Integer)shell.getData(BUSYID_NAME);
>				if (id == busyId) {
>					setCursorAndId(shell, null, null);
>				}
>			}
>		}
>	}
>
>	/**
>	 * Paranoia code to make sure we don't break UI because of one shell disposed, see bug 532632 comment 20
>	 */
>	private static void setCursorAndId(Shell shell, Cursor cursor, Integer busyId) {
>		if (!shell.isDisposed()) {
>			shell.setCursor(cursor);
>			// change: Additional Explicit update !
>			shell.update();
>			// end change
>		}
>		if (!shell.isDisposed()) {
>			shell.setData(BUSYID_NAME, busyId);
>		}
>	}
>	
>	// end copy-past from BussyIndicator class
>}

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Attachments on bug 562463: 282551