/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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.waveprotocol.wave.client.widget.popup;
import com.google.gwt.user.client.Window;
/**
* Utility class to bound a popup's co-ordinates so that they fit within the window.
*
*/
public class PositionUtil {
private static int SCREEN_EDGE_PADDING_PIXELS = 16;
/**
* Restrict a popup's position to stay within the screen horizontally.
*
* @param x The proposed x position of the popup.
* @param width The width of the popup.
* @return The s position at which the popup should appear.
*/
public static int boundToScreenHorizontal(int x, int width) {
return Math.min(Math.max(x, 0), Window.getClientWidth() - width - SCREEN_EDGE_PADDING_PIXELS);
}
/**
* Restrict a popup's position to stay within the screen vertically.
*
* @param y The proposed y position of the popup.
* @param height The height of the popup.
* @return The y position at which the popup should appear.
*/
public static int boundToScreenVertical(int y, int height) {
return Math.min(Math.max(y, 0), Window.getClientHeight() - height - SCREEN_EDGE_PADDING_PIXELS);
}
/**
* Restricts a popup's height to fit within the screen.
*
* @param height The proposed height of the popup.
* @return The height that the popup need to have to fit inside the screen.
*/
public static int boundHeightToScreen(int height) {
return Math.min(height, Window.getClientHeight() - 2 * SCREEN_EDGE_PADDING_PIXELS);
}
}