1 files changed, 112 insertions, 0 deletions
diff --git a/bundles/org.eclipse.swt/Eclipse SWT Custom Widgets/common/org/eclipse/swt/custom/ScrolledCompositeLayout.java b/bundles/org.eclipse.swt/Eclipse SWT Custom Widgets/common/org/eclipse/swt/custom/ScrolledCompositeLayout.java
new file mode 100644
index 0000000000..0af014860e
--- /dev/null
+++ b/bundles/org.eclipse.swt/Eclipse SWT Custom Widgets/common/org/eclipse/swt/custom/ScrolledCompositeLayout.java
@@ -0,0 +1,112 @@
+/*******************************************************************************
+ * Copyright (c) 2000, 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.swt.custom;
+
+import org.eclipse.swt.*;
+import org.eclipse.swt.graphics.*;
+import org.eclipse.swt.widgets.*;
+
+/**
+ * This class provides the layout for ScrolledComposite
+ * 
+ * @see ScrolledComposite
+ */
+class ScrolledCompositeLayout extends Layout {
+	
+	boolean inLayout = false;
+	static final int DEFAULT_WIDTH	= 64;
+	static final int DEFAULT_HEIGHT	= 64;
+	
+protected Point computeSize(Composite composite, int wHint, int hHint, boolean flushCache) {
+	ScrolledComposite sc = (ScrolledComposite)composite;
+	Point size = new Point(DEFAULT_WIDTH, DEFAULT_HEIGHT);
+	if (sc.content != null) {
+		Point preferredSize = sc.content.computeSize(wHint, hHint, flushCache);
+		Point currentSize = sc.content.getSize();
+		size.x = sc.getExpandHorizontal() ? preferredSize.x : currentSize.x;
+		size.y = sc.getExpandVertical() ? preferredSize.y : currentSize.y;
+	}
+	size.x = Math.max(size.x, sc.minWidth);
+	size.y = Math.max(size.y, sc.minHeight);
+	if (wHint != SWT.DEFAULT) size.x = wHint;
+	if (hHint != SWT.DEFAULT) size.y = hHint;
+	return size;
+}
+
+protected boolean flushCache(Control control) {
+	return true;
+}
+
+protected void layout(Composite composite, boolean flushCache) {
+	if (inLayout) return;
+	ScrolledComposite sc = (ScrolledComposite)composite;
+	if (sc.content == null) return;
+	ScrollBar hBar = sc.getHorizontalBar();
+	ScrollBar vBar = sc.getVerticalBar();
+	if (hBar != null) {
+		if (hBar.getSize().y >= sc.getSize().y) {
+			return;
+		}
+	}
+	if (vBar != null) {
+		if (vBar.getSize().x >= sc.getSize().x) {
+			return;
+		}
+	}
+	inLayout = true;
+	Rectangle contentRect = sc.content.getBounds();
+	if (!sc.alwaysShowScroll) {
+		boolean hVisible = sc.needHScroll(contentRect, false);
+		boolean vVisible = sc.needVScroll(contentRect, hVisible);
+		if (!hVisible && vVisible) hVisible = sc.needHScroll(contentRect, vVisible);
+		if (hBar != null) hBar.setVisible(hVisible);
+		if (vBar != null) vBar.setVisible(vVisible);
+	}
+	Rectangle hostRect = sc.getClientArea();
+	if (sc.expandHorizontal) {
+		contentRect.width = Math.max(sc.minWidth, hostRect.width);	
+	}
+	if (sc.expandVertical) {
+		contentRect.height = Math.max(sc.minHeight, hostRect.height);
+	}
+
+	if (hBar != null) {
+		hBar.setMaximum (contentRect.width);
+		hBar.setThumb (Math.min (contentRect.width, hostRect.width));
+		int hPage = contentRect.width - hostRect.width;
+		int hSelection = hBar.getSelection ();
+		if (hSelection >= hPage) {
+			if (hPage <= 0) {
+				hSelection = 0;
+				hBar.setSelection(0);
+			}
+			contentRect.x = -hSelection;
+		}
+	}
+
+	if (vBar != null) {
+		vBar.setMaximum (contentRect.height);
+		vBar.setThumb (Math.min (contentRect.height, hostRect.height));
+		int vPage = contentRect.height - hostRect.height;
+		int vSelection = vBar.getSelection ();
+		if (vSelection >= vPage) {
+			if (vPage <= 0) {
+				vSelection = 0;
+				vBar.setSelection(0);
+			}
+			contentRect.y = -vSelection;
+		}
+	}
+	
+	sc.content.setBounds (contentRect);
+	inLayout = false;
+}
+}