Committed Martin's patch to fix bug 221690: [content assist] code assist with colored labels

1 files changed, 148 insertions, 0 deletions

diff --git a/org.eclipse.jface.text/src/org/eclipse/jface/internal/text/TableOwnerDrawSupport.java b/org.eclipse.jface.text/src/org/eclipse/jface/internal/text/TableOwnerDrawSupport.java
new file mode 100644
index 00000000000..81b739e1469
--- /dev/null
+++ b/org.eclipse.jface.text/src/org/eclipse/jface/internal/text/TableOwnerDrawSupport.java
@@ -0,0 +1,148 @@
+/*******************************************************************************
+ * Copyright (c) 2008 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials
+ * are made available under the terms of the Eclipse Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/epl-v10.html
+ *
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.jface.internal.text;
+
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.custom.StyleRange;
+import org.eclipse.swt.events.DisposeEvent;
+import org.eclipse.swt.events.DisposeListener;
+import org.eclipse.swt.graphics.GC;
+import org.eclipse.swt.graphics.Image;
+import org.eclipse.swt.graphics.Rectangle;
+import org.eclipse.swt.graphics.TextLayout;
+import org.eclipse.swt.widgets.Display;
+import org.eclipse.swt.widgets.Event;
+import org.eclipse.swt.widgets.Listener;
+import org.eclipse.swt.widgets.Table;
+import org.eclipse.swt.widgets.TableItem;
+
+import org.eclipse.jface.window.Window;
+
+
+/**
+ * Adds owner draw support for tables.
+ * 
+ * @since 3.4
+ */
+public class TableOwnerDrawSupport implements Listener, DisposeListener {
+	
+	private static final String STYLED_RANGES_KEY= "styled_ranges"; //$NON-NLS-1$
+	
+	private TextLayout fLayout;
+
+	public static void install(Table table) {
+		TableOwnerDrawSupport listener= new TableOwnerDrawSupport(table.getDisplay());
+		table.addDisposeListener(listener);
+		table.addListener(SWT.MeasureItem, listener);
+		table.addListener(SWT.EraseItem, listener);
+		table.addListener(SWT.PaintItem, listener);
+	}
+	
+	/**
+	 * Stores the styled ranges in the given table item.
+	 * 
+	 * @param item table item
+	 * @param ranges the styled ranges or <code>null</code> to remove them
+	 * @since 3.4
+	 */
+	public static void storeStyleRanges(TableItem item, StyleRange[] ranges) {
+		item.setData(STYLED_RANGES_KEY, ranges);
+	}
+	
+	/**
+	 * Returns the styled ranges which are stored in the given table item.
+	 * 
+	 * @param item table item
+	 * @return the styled ranges
+	 * @since 3.4
+	 */
+	private static StyleRange[] getStyledRanges(TableItem item) {
+		return (StyleRange[])item.getData(STYLED_RANGES_KEY);
+	}
+	
+	private TableOwnerDrawSupport(Display display) {
+		fLayout= new TextLayout(display);
+		fLayout.setOrientation(Window.getDefaultOrientation());
+	}
+
+	/*
+	 * @see org.eclipse.swt.widgets.Listener#handleEvent(org.eclipse.swt.widgets.Event)
+	 */
+	public void handleEvent(Event event) {
+		switch (event.type) {
+			case SWT.MeasureItem:
+				break;
+			case SWT.EraseItem:
+				event.detail &= ~SWT.FOREGROUND;
+				break;
+			case SWT.PaintItem:
+				performPaint(event);
+				break;
+			}
+	}
+
+	/**
+	 * Performs the paint operation.
+	 * 
+	 * @param event the event
+	 */
+	private void performPaint(Event event) {
+		TableItem item= (TableItem) event.item;
+		GC gc= event.gc;
+		
+		Image image = item.getImage(0);
+		if (image != null) {
+			Rectangle imageBounds = item.getImageBounds(0);
+			Rectangle bounds = image.getBounds();
+			int x = imageBounds.x + Math.max(0, (imageBounds.width - bounds.width) / 2);
+			int y = imageBounds.y + Math.max(0, (imageBounds.height - bounds.height) / 2);
+			gc.drawImage(image, x, y);
+		}
+		
+		fLayout.setText(""); //$NON-NLS-1$
+		fLayout.setText(item.getText(0));
+		StyleRange[] ranges= getStyledRanges(item);
+		if (ranges != null) {
+			boolean isSelected= (event.detail & SWT.SELECTED) != 0;
+			for (int i= 0; i < ranges.length; i++) {
+				StyleRange curr= ranges[i];
+				if (isSelected) {
+					curr= (StyleRange) curr.clone();
+					curr.foreground= null;
+					curr.background= null;
+				}
+				fLayout.setStyle(curr, curr.start, curr.start + curr.length - 1);
+			}
+		}
+		
+		Rectangle textBounds = item.getTextBounds(0);
+		if (textBounds != null) {
+			Rectangle layoutBounds = fLayout.getBounds();
+			int x = textBounds.x;
+			int y = textBounds.y + Math.max(0, (textBounds.height - layoutBounds.height) / 2);
+			fLayout.draw(gc, x, y);
+		}
+		
+		
+		if ((event.detail & SWT.FOCUSED) != 0) {
+			Rectangle focusBounds = item.getBounds();
+			gc.drawFocus(focusBounds.x, focusBounds.y, focusBounds.width, focusBounds.height);
+		}
+	}
+	
+	/*
+	 * @see org.eclipse.swt.events.DisposeListener#widgetDisposed(org.eclipse.swt.events.DisposeEvent)
+	 */
+	public void widgetDisposed(DisposeEvent e) {
+		fLayout.dispose();
+	}
+}
+