/*******************************************************************************
 * Copyright (c) 2000, 2005 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
 * Port to the D programming language:
 *     Frank Benoit <benoit@tionex.de>
 *******************************************************************************/
module dwtx.draw2d.geometry.Transposer;

import dwt.dwthelper.utils;

import dwtx.draw2d.geometry.Dimension;
import dwtx.draw2d.geometry.Insets;
import dwtx.draw2d.geometry.Point;
import dwtx.draw2d.geometry.Rectangle;

/**
 * Conditionally transposes geometrical objects based on an "enabled" flag. When
 * enabled, the method t(Object) will transpose the passed geometrical object.
 * Otherwise, the object will be returned without modification
 */
public class Transposer {

private bool enabled = false;

/**
 * Disables transposing of inputs.
 *
 * @since 2.0
 */
public void disable() {
    enabled = false;
}

/**
 * Enables transposing of inputs.
 *
 * @since 2.0
 */
public void enable() {
    enabled = true;
}

/**
 * Returns <code>true</code> if this Transposer is enabled.
 *
 * @return <code>true</code> if this Transposer is enabled
 * @since 2.0
 */
public bool isEnabled() {
    return enabled;
}

/**
 * Sets the enabled state of this Transposer.
 *
 * @param e  New enabled value
 * @since 2.0
 */
public void setEnabled(bool e) {
    enabled = e;
}

/**
 * Returns a new transposed Dimension of the input Dimension.
 *
 * @param d  Input dimension being transposed.
 * @return  The new transposed dimension.
 * @since 2.0
 */
public Dimension t(Dimension d) {
    if (isEnabled())
        return d.getTransposed();
    return d;
}

/**
 * Returns a new transposed Insets of the input Insets.
 *
 * @param i  Insets to be transposed.
 * @return  The new transposed Insets.
 * @since 2.0
 */
public Insets t(Insets i) {
    if (isEnabled())
        return i.getTransposed();
    return i;
}

/**
 * Returns a new transposed Point of the input Point.
 *
 * @param p  Point to be transposed.
 * @return  The new transposed Point.
 * @since 2.0
 */
public Point t(Point p) {
    if (isEnabled())
        return p.getTransposed();
    return p;
}

/**
 * Returns a new transposed Rectangle of the input Rectangle.
 *
 * @param r  Rectangle to be transposed.
 * @return  The new trasnposed Rectangle.
 * @since 2.0
 */
public Rectangle t(Rectangle r) {
    if (isEnabled())
        return r.getTransposed();
    return r;
}

}