Attachment 272017 Details for Bug 529126 – Sample code

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Sample code

VirtualOwnerDrawTreeTable.java (text/plain), 3.95 KB, created by Thomas Singer

on 2017-12-22 04:05:14 EST

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Description:

Filename:

MIME Type:

Creator: Thomas Singer

Created: 2017-12-22 04:05:14 EST

Size: 3.95 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 VirtualOwnerDrawTreeTable {
>
>	// Static =================================================================
>
>	public static void main(String[] args) {
>		final Display display = new Display();
>		final Shell shell = new Shell(display);
>		shell.setText("Custom gradient selection for Tree");
>		shell.setLayout(new FillLayout());
>		final Tree tree = new Tree(shell, SWT.MULTI | SWT.FULL_SELECTION | SWT.VIRTUAL);
>		tree.setHeaderVisible(true);
>		tree.setLinesVisible(true);
>		final int columnCount = 4;
>		for (int i = 0; i < columnCount; i++) {
>			final TreeColumn column = new TreeColumn(tree, SWT.NONE);
>			column.setText("Column " + i);
>		}
>
>		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, new Listener() {
>			@Override
>			public void handleEvent(Event 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.PaintItem, new Listener() {
>			@Override
>			public void handleEvent(Event event) {
>				final TreeItem item = (TreeItem)event.item;
>				final String text = (String)item.getData();
>				event.gc.drawText(text + " [" + event.index + "]", event.x, event.y, true);
>			}
>		});
>
>		/*
>		 * NOTE: MeasureItem, PaintItem and EraseItem are called repeatedly.
>		 * Therefore, it is critical for performance that these methods be
>		 * as efficient as possible.
>		 */
>		tree.addListener(SWT.EraseItem, new Listener() {
>			@Override
>			public void handleEvent(Event event) {
>				event.detail &= ~SWT.HOT;
>				if ((event.detail & SWT.SELECTED) != 0) {
>					final GC gc = event.gc;
>					final Rectangle area = tree.getClientArea();
>					/*
>					 * If you wish to paint the selection beyond the end of
>					 * last column, you must change the clipping region.
>					 */
>					final int columnCount = tree.getColumnCount();
>					if (event.index == columnCount - 1 || columnCount == 0) {
>						final int width = area.x + area.width - event.x;
>						if (width > 0) {
>							final Region region = new Region();
>							gc.getClipping(region);
>							region.add(event.x, event.y, width, event.height);
>							gc.setClipping(region);
>							region.dispose();
>						}
>					}
>					gc.setAdvanced(true);
>					if (gc.getAdvanced()) {
>						gc.setAlpha(127);
>					}
>					final Rectangle rect = event.getBounds();
>					final Color foreground = gc.getForeground();
>					final Color background = gc.getBackground();
>					gc.setForeground(display.getSystemColor(SWT.COLOR_RED));
>					gc.setBackground(display.getSystemColor(SWT.COLOR_LIST_BACKGROUND));
>					gc.fillGradientRectangle(0, rect.y, 500, rect.height, false);
>					// restore colors for subsequent drawing
>					gc.setForeground(foreground);
>					gc.setBackground(background);
>					event.detail &= ~SWT.SELECTED;
>				}
>			}
>		});
>		tree.getColumn(0).setWidth(200);
>		for (int i = 1; i < columnCount; i++) {
>			tree.getColumn(i).pack();
>		}
>		tree.setSelection(tree.getItem(0));
>
>		tree.addListener(SWT.MouseDown, new Listener() {
>			@Override
>			public void handleEvent(Event event) {
>				System.out.println("event = " + event);
>			}
>		});
>		shell.setSize(500, 500);
>		shell.open();
>		while (!shell.isDisposed()) {
>			if (!display.readAndDispatch()) {
>				display.sleep();
>			}
>		}
>		display.dispose();
>	}
>}

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Attachments on bug 529126: 272017