/*******************************************************************************
* Copyright 2009, 2010 Lars Grammel
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*******************************************************************************/
package org.thechiselgroup.choosel.dnd.client.windows;
import org.thechiselgroup.choosel.core.client.geometry.Size;
import org.thechiselgroup.choosel.core.client.geometry.Point;
public class PositionManager {
private Size desktop;
private final int horizontalSteps;
private int invocationCounter = 0;
private final int padding;
private final int verticalSteps;
public PositionManager(Size desktop, int horizontalSteps,
int verticalSteps, int padding) {
this.desktop = desktop;
this.verticalSteps = verticalSteps;
this.horizontalSteps = horizontalSteps;
this.padding = padding;
}
private int calculate(int windowLength, int offsetLength, int steps) {
int availableLength = offsetLength - windowLength - 2 * padding;
int stepLength = availableLength / steps;
return padding + stepLength * (invocationCounter % steps);
}
public Point getNextLocation(int windowWidth, int windowHeight) {
int x = calculate(windowWidth, desktop.getWidth(), horizontalSteps);
int y = calculate(windowHeight, desktop.getHeight(), verticalSteps);
invocationCounter++;
return new Point(x, y);
}
}