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/**
* Copyright (c) 2004 - 2010 Eike Stepper (Berlin, Germany) 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:
* Andre Dietisheim - initial API and implementation
*/
package org.eclipse.emf.cdo.ui.internal.branch.layout;
import org.eclipse.emf.cdo.ui.internal.branch.geometry.GeometryUtils;
import org.eclipse.emf.cdo.ui.internal.branch.item.AbstractBranchPointNode;
import org.eclipse.emf.cdo.ui.internal.branch.item.BranchPointNode;
import org.eclipse.emf.cdo.ui.internal.branch.item.BranchTreeUtils;
import org.eclipse.zest.layouts.dataStructures.DisplayIndependentRectangle;
import org.eclipse.zest.layouts.dataStructures.InternalNode;
/**
* A strategy that layouts a branch. A branch centers its (sibling) nodes below each other while using their time stamp
* to set the y coordinate. Sub-Branches are displaced to the right or to the left (left and right sub branches are
* distributed equally).
* <p>
* The current implementation may only layout vertically.
*
* @author Andre Dietisheim
*/
public abstract class AbstractBranchViewLayoutStrategy implements BranchViewLayoutStrategy
{
protected AbstractBranchViewLayoutStrategy()
{
}
public void layoutBaselineNode(BranchView branchView, AbstractBranchPointNode node)
{
BranchTreeUtils.setInternalSize(node);
setBaselineNodeLocation(node);
initBranchBounds(branchView, node);
}
protected void initBranchBounds(BranchView branchView, AbstractBranchPointNode node)
{
InternalNode baselineInternalNode = BranchTreeUtils.getInternalNode(node);
DisplayIndependentRectangle bounds = new DisplayIndependentRectangle(baselineInternalNode.getInternalX(),
baselineInternalNode.getInternalY(), baselineInternalNode.getInternalWidth(), baselineInternalNode
.getInternalHeight());
branchView.setBounds(bounds);
}
/**
* Layout the given node as sibling node to the baseline node (and its siblings).
*
* @param branchView
* the branch view to layout the node to
* @param node
* the node to layout
*/
public void layoutNode(BranchView branchView, AbstractBranchPointNode node, AbstractBranchPointNode previousNode)
{
BranchTreeUtils.setInternalSize(node);
setSameBranchNodeLocation(node, previousNode);
setBranchBounds(branchView, node);
}
/**
* Sets the bounds of the given node. The node is centered horizontally to the given previous node.
*/
protected void setBaselineNodeLocation(AbstractBranchPointNode node)
{
double y = node.getTimeStamp();
BranchTreeUtils.centerHorizontally(node, y);
}
/**
* Sets the location of the given node. The node is centered horizontally to the given previous (sibling) node.
*/
protected void setSameBranchNodeLocation(AbstractBranchPointNode node, AbstractBranchPointNode previousNode)
{
double y = node.getTimeStamp();
BranchTreeUtils.centerHorizontally(node, previousNode, y);
}
/**
* Sets the bounds of the current branch for the given additional node. The bounds are expanded if the size of the
* node requires it.
*/
protected void setBranchBounds(BranchView branchView, AbstractBranchPointNode node)
{
InternalNode internalNode = BranchTreeUtils.getInternalNode(node);
GeometryUtils.union(branchView.getBounds(), //
internalNode.getInternalX() //
, internalNode.getInternalY() //
, internalNode.getInternalWidth() //
, internalNode.getInternalHeight());
}
/**
* Adds the given sub branch to this branch. This strategy distributes the sub-branches equally to the left and to the
* right of this branch. It starts by putting the last sub branch to the right of the current branch and puts the
* previous one to the left etc. .
*
* @param branchPointNode
* the node on the current branch view that the sub-branch view shall be attached to
* @param subBranchView
* the sub branch view to add
* @param branchView
* the branch view
*/
public void layoutSubBranchView(BranchView branchView, BranchView subBranchView, BranchPointNode branchPointNode)
{
if (subBranchView != null)
{
setBranchViewLocation(branchView, subBranchView, branchPointNode);
GeometryUtils.union(branchView.getBounds(), subBranchView.getBounds());
}
}
protected abstract void setBranchViewLocation(BranchView branchView, BranchView subBranchView,
BranchPointNode branchPointNode);
}
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