CenterPopupPositioner.java

/*
 * Copyright 2014 ArcBees Inc.
 *
 * 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 com.gwtplatform.mvp.client.view;

import com.google.gwt.user.client.Window;

/**
 * Positions the popup in the center of the screen.
 */
public class CenterPopupPositioner extends PopupPositioner {
    /**
     * By default this method centers the popup horizontally.
     * You can override this method to change the horizontal position of the popup.
     * @param popupWidth the width of the popup
     * @return the left position of the popup
     */
    protected int getLeft(int popupWidth) {
        return ((Window.getClientWidth() - popupWidth) / 2) + Window.getScrollLeft();
    }

    /**
     * By default this method centers the popup vertically.
     * You can override this method to change the vertical position of the popup.
     * @param popupHeight the height of the popup
     * @return the top position of the popup.
     */
    protected int getTop(int popupHeight) {
        return ((Window.getClientHeight() - popupHeight) / 2) + Window.getScrollTop();
    }
}