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/*******************************************************************************
* Copyright (c) 2006 Sybase, Inc. 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:
* Sybase, Inc. - initial API and implementation
*******************************************************************************/
package org.eclipse.jst.pagedesigner.css2.layout;
import org.eclipse.draw2d.AbstractLayout;
import org.eclipse.draw2d.IFigure;
import org.eclipse.draw2d.geometry.Dimension;
/**
* Layout for flow figures
*
*/
public abstract class FlowFigureLayout extends AbstractLayout {
/**
* <code>true</code> if the context has changed, and a layout is needed.
*/
protected boolean _invalid = true;
/**
* The flow context in which this LayoutManager exists.
*/
private FlowContext _context;
/**
* The figure passed by layout(Figure) is held for convenience.
*/
private final FlowFigure _flowFigure;
/**
* Constructs a new FlowFigureLayout with the given FlowFigure.
*
* @param flowfigure
* the FlowFigure
*/
protected FlowFigureLayout(FlowFigure flowfigure) {
this._flowFigure = flowfigure;
}
/**
* TextFlowLayouts do not calculate a preferred size because it is too
* expensive. {@link FlowPage}will actually layout itself in order to
* calculate preferredSize.
*
* @see AbstractLayout#calculatePreferredSize(IFigure)
*/
public Dimension calculatePreferredSize(IFigure f, int w, int h) {
return null;
}
/**
* @return the FlowFigure
*/
protected FlowFigure getFlowFigure() {
return _flowFigure;
}
/**
* Marks this layout as invalid.
*
* @see org.eclipse.draw2d.LayoutManager#invalidate()
*/
public void invalidate() {
_invalid = true;
super.invalidate();
}
/**
* @see org.eclipse.draw2d.LayoutManager#layout(IFigure)
*/
public final void layout(IFigure figure) {
layout();
_invalid = false;
}
/**
* Called during {@link #layout(IFigure)}. The {@link #_invalid}flag is
* reset after this method is called.
*/
protected abstract void layout();
/**
* Sets the context for this layout manager.
*
* @param flowContext
* the context of this layout
*/
public void setOriginalFlowContext(FlowContext flowContext) {
_context = flowContext;
}
/**
* @return the original flow context
*/
protected final FlowContext getOriginalFlowContext() {
return _context;
}
/**
* get flow context.
*
* @return the flow context
*/
public FlowContext getFlowContext() {
return _context;
}
public String toString() {
// for debug purpose.
return _flowFigure.toString();
}
/**
* Called to dispose the layout
*/
abstract public void dispose();
}
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