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/*******************************************************************************
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* Copyright (c) 2000, 2010 IBM Corporation and others.
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* All rights reserved. This program and the accompanying materials
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* are made available under the terms of the Eclipse Public License v1.0
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* which accompanies this distribution, and is available at
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* http://www.eclipse.org/legal/epl-v10.html
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*
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* Contributors:
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* IBM Corporation - initial API and implementation
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*******************************************************************************/
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package org.eclipse.gef.internal.ui.palette.editparts;
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import org.eclipse.draw2d.IFigure;
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import org.eclipse.draw2d.ScrollBar;
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import org.eclipse.draw2d.ScrollPane;
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import org.eclipse.draw2d.ScrollPaneLayout;
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import org.eclipse.draw2d.Viewport;
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import org.eclipse.draw2d.geometry.Dimension;
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import org.eclipse.draw2d.geometry.Insets;
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import org.eclipse.draw2d.geometry.Rectangle;
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public class OverlayScrollPaneLayout extends ScrollPaneLayout {
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/**
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* {@inheritDoc} In OverlayScrollPane, scrollbars are overlayed on top of
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* the Viewport, so the preferred size is just the Viewports preferred size.
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*
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* @since 2.0
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*/
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protected Dimension calculatePreferredSize(IFigure container, int wHint,
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int hHint) {
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ScrollPane scrollpane = (ScrollPane) container;
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Insets insets = scrollpane.getInsets();
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int excludedWidth = insets.getWidth();
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int excludedHeight = insets.getHeight();
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return scrollpane
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.getViewport()
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.getPreferredSize(wHint - excludedWidth, hHint - excludedHeight)
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.getExpanded(excludedWidth, excludedHeight);
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}
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/** {@inheritDoc} */
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public void layout(IFigure parent) {
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ScrollPane scrollpane = (ScrollPane) parent;
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Rectangle clientArea = parent.getClientArea();
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ScrollBar hBar = scrollpane.getHorizontalScrollBar(), vBar = scrollpane
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.getVerticalScrollBar();
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Viewport viewport = scrollpane.getViewport();
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Insets insets = new Insets();
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insets.bottom = hBar.getPreferredSize(clientArea.width,
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clientArea.height).height;
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insets.right = vBar.getPreferredSize(clientArea.width,
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clientArea.height).width;
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int hVis = scrollpane.getHorizontalScrollBarVisibility(), vVis = scrollpane
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.getVerticalScrollBarVisibility();
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Dimension available = clientArea.getSize(), preferred = viewport
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.getPreferredSize(available.width, available.height).getCopy();
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boolean none = available.contains(preferred), both = !none
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&& vVis != NEVER && hVis != NEVER
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&& preferred.contains(available), showV = both
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|| preferred.height > available.height, showH = both
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|| preferred.width > available.width;
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// Adjust for visibility override flags
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showV = !(vVis == NEVER) && (showV || vVis == ALWAYS);
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showH = !(hVis == NEVER) && (showH || hVis == ALWAYS);
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if (!showV)
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insets.right = 0;
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if (!showH)
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insets.bottom = 0;
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Rectangle bounds, viewportArea = clientArea;
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if (showV) {
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bounds = new Rectangle(viewportArea.right() - insets.right,
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viewportArea.y, insets.right, viewportArea.height);
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vBar.setBounds(bounds);
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// vBar.setMaximum(preferred.height);
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}
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if (showH) {
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bounds = new Rectangle(viewportArea.x, viewportArea.bottom()
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- insets.bottom, viewportArea.width, insets.bottom);
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hBar.setBounds(bounds);
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// hBar.setMaximum(preferred.width);
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}
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vBar.setVisible(showV);
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hBar.setVisible(showH);
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viewport.setBounds(viewportArea);
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}
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}
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