prepare headless annotation support

1 files changed, 87 insertions, 0 deletions

diff --git a/org.eclipse.jface.text/src/org/eclipse/jface/text/source/ImageUtilities.java b/org.eclipse.jface.text/src/org/eclipse/jface/text/source/ImageUtilities.java
new file mode 100644
index 00000000000..3ba24ff7a59
--- /dev/null
+++ b/org.eclipse.jface.text/src/org/eclipse/jface/text/source/ImageUtilities.java
@@ -0,0 +1,87 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 2003 IBM Corporation and others.
+ * All rights reserved. This program and the accompanying materials 
+ * are made available under the terms of the Common Public License v1.0
+ * which accompanies this distribution, and is available at
+ * http://www.eclipse.org/legal/cpl-v10.html
+ * 
+ * Contributors:
+ *     IBM Corporation - initial API and implementation
+ *******************************************************************************/
+package org.eclipse.jface.text.source;
+
+import org.eclipse.swt.SWT;
+import org.eclipse.swt.graphics.FontMetrics;
+import org.eclipse.swt.graphics.GC;
+import org.eclipse.swt.graphics.Image;
+import org.eclipse.swt.graphics.Rectangle;
+import org.eclipse.swt.widgets.Canvas;
+
+/**
+ * Provides methods for drawing images onto a canvas.
+ *
+ * @since 3.0
+ */
+public class ImageUtilities {
+	
+	/**
+	 * Draws an image aligned inside the given rectangle on the given canvas.
+	 *
+	 * @param image the image to be drawn
+	 * @param gc the drawing GC
+	 * @param canvas the canvas on which to draw
+	 * @param r the clipping rectangle
+	 * @param halign the horizontal alignment of the image to be drawn
+	 * @param valign the vertical alignment of the image to be drawn
+	 */
+	public static void drawImage(Image image, GC gc, Canvas canvas, Rectangle r, int halign, int valign) {
+		if (image != null) {
+			
+			Rectangle bounds= image.getBounds();
+			
+			int x= 0;
+			switch(halign) {
+			case SWT.LEFT:
+				break;
+			case SWT.CENTER:
+				x= (r.width - bounds.width) / 2;
+				break;
+			case SWT.RIGHT:
+				x= r.width - bounds.width;
+				break;
+			}
+			
+			int y= 0;
+			switch (valign) {
+			case SWT.TOP: {
+				FontMetrics fontMetrics= gc.getFontMetrics();
+				y= (fontMetrics.getHeight() - bounds.height)/2;
+				break;
+			}
+			case SWT.CENTER:
+				y= (r.height - bounds.height) / 2;
+				break;
+			case SWT.BOTTOM: {
+				FontMetrics fontMetrics= gc.getFontMetrics();
+				y= r.height - (fontMetrics.getHeight() + bounds.height)/2;
+				break;
+			}
+			}
+			
+			gc.drawImage(image, r.x+x, r.y+y);
+		}
+	}
+	
+	/**
+	 * Draws an image aligned inside the given rectangle on the given canvas.
+	 *
+	 * @param image the image to be drawn
+	 * @param gc the drawing GC
+	 * @param canvas the canvas on which to draw
+	 * @param r the clipping rectangle
+	 * @param align the alignment of the image to be drawn
+	 */
+	public static void drawImage(Image image, GC gc, Canvas canvas, Rectangle r, int align) {
+		drawImage(image, gc, canvas, r, align, SWT.CENTER);
+	}
+}