Attachment 287327 Details for Bug 576690 – Snippet to reproduce

Snippet to reproduce

VirtualOwnerDrawTree.java (text/plain), 2.63 KB, created by Thomas Singer

on 2021-10-18 04:35:45 EDT

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Creator: Thomas Singer

Created: 2021-10-18 04:35:45 EDT

Size: 2.63 KB

patch

obsolete

>import org.eclipse.swt.*;
>import org.eclipse.swt.graphics.*;
>import org.eclipse.swt.layout.*;
>import org.eclipse.swt.widgets.*;
>
>/**
> * @author Thomas Singer
> */
>public class VirtualOwnerDrawTree {
>
>	// Static =================================================================
>
>	public static void main(String[] args) {
>		final Display display = new Display();
>		final Shell shell = new Shell(display);
>		shell.setLayout(new FillLayout());
>		final Tree tree = new Tree(shell, SWT.MULTI | SWT.FULL_SELECTION | SWT.VIRTUAL);
>
>		final int itemCount = 5;
>		for (int i = 0; i < itemCount; i++) {
>			final TreeItem item1 = new TreeItem(tree, SWT.NONE);
>
>			for (int j = 0; j < i; j++) {
>				final TreeItem item2 = new TreeItem(item1, SWT.NONE);
>
>				for (int k = 0; k < j; k++) {
>					new TreeItem(item2, SWT.NONE);
>				}
>			}
>		}
>
>		tree.addListener(SWT.SetData, event -> {
>			final TreeItem item = (TreeItem)event.item;
>
>			final TreeItem parentItem = item.getParentItem();
>			final String text;
>
>			if (parentItem != null) {
>				final String parentText = (String)parentItem.getData();
>				text = parentText + event.index + "/";
>			}
>			else {
>				text = "/";
>			}
>
>			item.setData(text);
>		});
>
>		tree.addListener(SWT.MeasureItem, event -> {
>			final TreeItem item = (TreeItem)event.item;
>			final String text = (String)item.getData();
>			final Point size = event.gc.stringExtent(text);
>			event.width = size.x;
>			event.height = size.y;
>		});
>		tree.addListener(SWT.EraseItem, event -> {
>			event.gc.setClipping((Rectangle)null);
>			final Rectangle clientArea = tree.getClientArea();
>
>			int colorConstant = SWT.COLOR_WHITE;
>			if ((event.detail & SWT.SELECTED) > 0) {
>				colorConstant = SWT.COLOR_YELLOW;
>			}
>			else if ((event.detail & SWT.HOT) > 0) {
>				colorConstant = SWT.COLOR_GRAY;
>			}
>			event.gc.setBackground(event.display.getSystemColor(colorConstant));
>
>			event.gc.fillRectangle(clientArea.x, event.y, clientArea.width, event.height);
>			event.detail &= ~(SWT.FOREGROUND | SWT.BACKGROUND | SWT.HOT | SWT.SELECTED);
>		});
>		tree.addListener(SWT.PaintItem, event -> {
>			final TreeItem item = (TreeItem)event.item;
>			final String text = (String)item.getData();
>			final int colorConstant = (event.detail & SWT.HOT) > 0 ? SWT.COLOR_RED : SWT.COLOR_BLACK;
>			event.gc.setForeground(event.display.getSystemColor(colorConstant));
>			event.gc.drawString(text, event.x, event.y, true);
>		});
>		tree.setSelection(tree.getItem(0));
>		shell.setSize(200, 200);
>		shell.open();
>		while (!shell.isDisposed()) {
>			if (!display.readAndDispatch()) {
>				display.sleep();
>			}
>		}
>		display.dispose();
>	}
>}

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Attachments on bug 576690: 287327 | 287328