| /******************************************************************************* |
| * Copyright (c) 2000, 2010 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.gef.internal.ui.palette.editparts; |
| |
| import org.eclipse.draw2d.IFigure; |
| import org.eclipse.draw2d.ScrollBar; |
| import org.eclipse.draw2d.ScrollPane; |
| import org.eclipse.draw2d.ScrollPaneLayout; |
| import org.eclipse.draw2d.Viewport; |
| import org.eclipse.draw2d.geometry.Dimension; |
| import org.eclipse.draw2d.geometry.Insets; |
| import org.eclipse.draw2d.geometry.Rectangle; |
| |
| public class OverlayScrollPaneLayout extends ScrollPaneLayout { |
| |
| /** |
| * {@inheritDoc} In OverlayScrollPane, scrollbars are overlayed on top of |
| * the Viewport, so the preferred size is just the Viewports preferred size. |
| * |
| * @since 2.0 |
| */ |
| protected Dimension calculatePreferredSize(IFigure container, int wHint, |
| int hHint) { |
| ScrollPane scrollpane = (ScrollPane) container; |
| Insets insets = scrollpane.getInsets(); |
| |
| int excludedWidth = insets.getWidth(); |
| int excludedHeight = insets.getHeight(); |
| |
| return scrollpane |
| .getViewport() |
| .getPreferredSize(wHint - excludedWidth, hHint - excludedHeight) |
| .getExpanded(excludedWidth, excludedHeight); |
| } |
| |
| /** {@inheritDoc} */ |
| public void layout(IFigure parent) { |
| ScrollPane scrollpane = (ScrollPane) parent; |
| Rectangle clientArea = parent.getClientArea(); |
| |
| ScrollBar hBar = scrollpane.getHorizontalScrollBar(), vBar = scrollpane |
| .getVerticalScrollBar(); |
| Viewport viewport = scrollpane.getViewport(); |
| |
| Insets insets = new Insets(); |
| insets.bottom = hBar.getPreferredSize(clientArea.width, |
| clientArea.height).height; |
| insets.right = vBar.getPreferredSize(clientArea.width, |
| clientArea.height).width; |
| |
| int hVis = scrollpane.getHorizontalScrollBarVisibility(), vVis = scrollpane |
| .getVerticalScrollBarVisibility(); |
| |
| Dimension available = clientArea.getSize(), preferred = viewport |
| .getPreferredSize(available.width, available.height).getCopy(); |
| |
| boolean none = available.contains(preferred), both = !none |
| && vVis != NEVER && hVis != NEVER |
| && preferred.contains(available), showV = both |
| || preferred.height > available.height, showH = both |
| || preferred.width > available.width; |
| |
| // Adjust for visibility override flags |
| showV = !(vVis == NEVER) && (showV || vVis == ALWAYS); |
| showH = !(hVis == NEVER) && (showH || hVis == ALWAYS); |
| |
| if (!showV) |
| insets.right = 0; |
| if (!showH) |
| insets.bottom = 0; |
| Rectangle bounds, viewportArea = clientArea; |
| |
| if (showV) { |
| bounds = new Rectangle(viewportArea.right() - insets.right, |
| viewportArea.y, insets.right, viewportArea.height); |
| vBar.setBounds(bounds); |
| // vBar.setMaximum(preferred.height); |
| } |
| if (showH) { |
| bounds = new Rectangle(viewportArea.x, viewportArea.bottom() |
| - insets.bottom, viewportArea.width, insets.bottom); |
| hBar.setBounds(bounds); |
| // hBar.setMaximum(preferred.width); |
| } |
| vBar.setVisible(showV); |
| hBar.setVisible(showH); |
| viewport.setBounds(viewportArea); |
| } |
| |
| } |