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/******************************************************************************* |
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/******************************************************************************* |
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* Copyright (c) 2000, 2005 IBM Corporation and others. |
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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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* 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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* 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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* which accompanies this distribution, and is available at |
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*******************************************************************************/ |
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*******************************************************************************/ |
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package org.eclipse.draw2d; |
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package org.eclipse.draw2d; |
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import java.util.ListIterator; |
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import org.eclipse.draw2d.geometry.Point; |
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import org.eclipse.draw2d.geometry.Point; |
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import org.eclipse.draw2d.geometry.Rectangle; |
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/** |
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/** |
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* A layout for {@link org.eclipse.draw2d.FreeformFigure FreeformFigures}. |
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* A layout for {@link org.eclipse.draw2d.FreeformFigure FreeformFigures}. |
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* Supports option to set only positive (x,y) coordinates for children figures. |
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*/ |
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*/ |
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public class FreeformLayout |
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public class FreeformLayout |
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extends XYLayout |
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extends XYLayout |
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{ |
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{ |
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/** |
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/** |
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* Option that forces only positive coordinates to children figures by |
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* setting the layout origin appropriately |
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*/ |
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private static final int FLAG__POSITIVE_COORDINATES = 1; |
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/** |
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* Option flags |
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*/ |
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private int flags; |
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/** |
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* Layout origin point |
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*/ |
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private Point origin = null; |
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/** |
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* Returns the point (0,0) as the origin. |
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* Returns the point (0,0) as the origin. |
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* @see XYLayout#getOrigin(IFigure) |
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* @see XYLayout#getOrigin(IFigure) |
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*/ |
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*/ |
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public Point getOrigin(IFigure figure) { |
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public Point getOrigin(IFigure figure) { |
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return new Point(); |
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if (origin == null) { |
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origin = new Point(); |
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if (isPositiveCoordinates()) { |
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ListIterator children = figure.getChildren().listIterator(); |
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while (children.hasNext()) { |
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IFigure f = (IFigure) children.next(); |
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Rectangle constraint = (Rectangle)getConstraint(f); |
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if (constraint != null) { |
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origin.x = Math.min(origin.x, constraint.x); |
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origin.y = Math.min(origin.y, constraint.y); |
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} |
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} |
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origin.negate(); |
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} |
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} |
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return origin; |
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} |
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/** |
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* Checks whether the positive coordinates flag is on, e.g positive |
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* coordinates for children are inforced by the layout |
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* |
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* @return <code>boolean</code> |
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* @since 3.2 |
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*/ |
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public boolean isPositiveCoordinates() { |
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return (flags & FLAG__POSITIVE_COORDINATES) != 0; |
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} |
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/** |
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* Sets/unsets the positive coordinates flag for true/false parameters |
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* respectively. If option is set to on then layout calculates positive |
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* coordinates for children figures by adjusting the layout origin |
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* accordingly. |
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* |
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* @param positiveCoordinates |
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* @since 3.2 |
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*/ |
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public void setPositiveCoordinates(boolean positiveCoordinates) { |
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if (positiveCoordinates != isPositiveCoordinates()) { |
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if (positiveCoordinates) { |
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flags |= FLAG__POSITIVE_COORDINATES; |
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} else { |
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flags &= ~FLAG__POSITIVE_COORDINATES; |
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} |
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invalidate(); |
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} |
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} |
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/** |
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* @see org.eclipse.draw2d.AbstractLayout#invalidate() |
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*/ |
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public void invalidate() { |
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origin = null; |
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super.invalidate(); |
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} |
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} |
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} |
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} |
