Attachment 266204 Details for Bug 510172 – Sample to reproduce

Some Eclipse Foundation services are deprecated, or will be soon. Please ensure you've read this important communication.

Sample to reproduce

Snippet220.java (text/plain), 2.31 KB, created by Thomas Singer

on 2017-01-10 05:21:30 EST

(hide)

Description:

Filename:

MIME Type:

Creator: Thomas Singer

Created: 2017-01-10 05:21:30 EST

Size: 2.31 KB

patch

obsolete

>import org.eclipse.swt.*;
>import org.eclipse.swt.graphics.*;
>import org.eclipse.swt.widgets.*;
>
>/**
> * @author Thomas Singer
> */
>public class Snippet220 {
>
>	public static void main(String [] args) {
>		Display display = new Display();
>		Shell shell = new Shell(display);
>		shell.setBounds(10, 10, 350, 200);
>		Image xImage = new Image (display, 16, 16);
>		GC gc = new GC(xImage);
>		gc.setForeground(display.getSystemColor(SWT.COLOR_RED));
>		gc.drawLine(1, 1, 14, 14);
>		gc.drawLine(1, 14, 14, 1);
>		gc.drawOval(2, 2, 11, 11);
>		gc.dispose();
>		final int IMAGE_MARGIN = 2;
>		final Tree tree = new Tree(shell, SWT.BORDER);
>		tree.setBounds(10, 10, 300, 150);
>		TreeItem item = new TreeItem(tree, SWT.NONE);
>		item.setText("root item");
>		for (int i = 0; i < 4; i++) {
>			TreeItem newItem = new TreeItem(item, SWT.NONE);
>			newItem.setText("descendent " + i);
>			if (i % 2 == 0) newItem.setData(xImage);
>			item.setExpanded(true);
>			item = newItem;
>		}
>
>	/*
>	 * NOTE: MeasureItem and PaintItem are called repeatedly.  Therefore it is
>	 * critical for performance that these methods be as efficient as possible.
>	 */
>		final Listener listener = new Listener() {
>			private boolean selected;
>
>			@Override
>			public void handleEvent(Event event) {
>				TreeItem item1 = (TreeItem)event.item;
>				Image trailingImage = (Image)item1.getData();
>				if (event.type == SWT.MeasureItem) {
>					selected = (event.detail & SWT.SELECTED) != 0;
>					System.out.println("measure " + item1.getText() + " = " + selected);
>					if (trailingImage != null) {
>						event.width += trailingImage.getBounds().width + IMAGE_MARGIN;
>					}
>				}
>				else if (event.type == SWT.PaintItem) {
>					if (trailingImage != null) {
>						int x = event.x;
>						System.out.println("paint " + item1.getText() + " = " + ((event.detail & SWT.SELECTED) != 0));
>						if (selected) {
>							x += event.width + IMAGE_MARGIN;
>						}
>						int itemHeight = tree.getItemHeight();
>						int imageHeight = trailingImage.getBounds().height;
>						int y = event.y + (itemHeight - imageHeight) / 2;
>						event.gc.drawImage(trailingImage, x, y);
>					}
>				}
>			}
>		};
>		tree.addListener(SWT.MeasureItem, listener);
>		tree.addListener(SWT.PaintItem, listener);
>
>		shell.open();
>		while (!shell.isDisposed()) {
>			if (!display.readAndDispatch()) display.sleep();
>		}
>		xImage.dispose();
>		display.dispose();
>	}
>}

Actions: View

Attachments on bug 510172: 266204