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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.draw2d;
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import org.eclipse.draw2d.geometry.Dimension;
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import org.eclipse.draw2d.geometry.Rectangle;
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/**
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* A viewport for {@link org.eclipse.draw2d.FreeformFigure FreeformFigures}.
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* FreeformFigures can only reside in this type of viewport.
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*/
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public class FreeformViewport extends Viewport {
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class FreeformViewportLayout extends ViewportLayout {
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protected Dimension calculatePreferredSize(IFigure parent, int wHint,
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int hHint) {
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getContents().validate();
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wHint = Math.max(0, wHint);
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hHint = Math.max(0, hHint);
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return ((FreeformFigure) getContents()).getFreeformExtent()
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.getExpanded(getInsets()).union(0, 0)
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.union(wHint - 1, hHint - 1).getSize();
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}
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protected boolean isSensitiveHorizontally(IFigure parent) {
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return true;
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}
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protected boolean isSensitiveVertically(IFigure parent) {
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return true;
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}
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public void layout(IFigure figure) {
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// Do nothing, contents updates itself.
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}
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}
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/**
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* Constructs a new FreeformViewport. This viewport must use graphics
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* translation to scroll the FreeformFigures inside of it.
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*/
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public FreeformViewport() {
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super(true); // Must use graphics translate to scroll freeforms.
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setLayoutManager(new FreeformViewportLayout());
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}
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/**
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* Readjusts the scrollbars. In doing so, it gets the freeform extent of the
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* contents and unions this rectangle with this viewport's client area, then
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* sets the contents freeform bounds to be this unioned rectangle. Then
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* proceeds to set the scrollbar values based on this new information.
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*
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* @see Viewport#readjustScrollBars()
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*/
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protected void readjustScrollBars() {
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if (getContents() == null)
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return;
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if (!(getContents() instanceof FreeformFigure))
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return;
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FreeformFigure ff = (FreeformFigure) getContents();
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Rectangle clientArea = getClientArea();
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Rectangle bounds = ff.getFreeformExtent().getCopy();
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bounds.union(0, 0, clientArea.width, clientArea.height);
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ff.setFreeformBounds(bounds);
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getVerticalRangeModel().setAll(bounds.y, clientArea.height,
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bounds.bottom());
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getHorizontalRangeModel().setAll(bounds.x, clientArea.width,
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bounds.right());
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}
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/**
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* Returns <code>true</code>.
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*
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* @see Figure#useLocalCoordinates()
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*/
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protected boolean useLocalCoordinates() {
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return true;
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}
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}
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