/*
* Copyright 2011 cruxframework.org.
*
* 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.cruxframework.crux.core.client.screen;
import org.cruxframework.crux.core.client.screen.DeviceAdaptive.Input;
import org.cruxframework.crux.core.client.screen.DeviceAdaptive.Size;
import org.cruxframework.crux.core.client.screen.Screen;
import org.cruxframework.crux.core.client.utils.StringUtils;
import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.dom.client.Document;
import com.google.gwt.dom.client.MetaElement;
/**
* Helper Class to configure display for different devices.
* @author Thiago da Rosa de Bustamante
*
*/
public class DisplayHandler
{
/**
* Configure a viewport with a default size.
*/
public static void configureViewport()
{
configureViewport("user-scalable=no, width=320", "user-scalable=no, width=device-width, height=device-height");
}
/**
* Configure a viewport using given contents for small and large displays
* @param smallDisplayContent
* @param largeDisplayContent
*/
public static void configureViewport(String smallDisplayContent, String largeDisplayContent)
{
if (Screen.getCurrentDevice().getSize().equals(Size.small))
{
configureViewport(smallDisplayContent);
}
else if (!Screen.getCurrentDevice().getInput().equals(Input.mouse))
{
configureViewport(largeDisplayContent);
}
}
/**
* Configure a viewport using given contents
* @param content
*/
public static void configureViewport(String content)
{
if (!StringUtils.isEmpty(content))
{
createViewport(content);
}
}
/**
* Create a viewport meta element with specified content
* @param content
*/
public static void createViewport(String content)
{
createViewport(content, getCurrentWindow());
}
/**
* Create a viewport meta element with specified content
* @param content
* @param window
*/
public static void createViewport(String content, JavaScriptObject wnd)
{
Document document = getWindowDocument(wnd);
MetaElement viewport = document.createMetaElement();
viewport.setContent(content);
viewport.setName("viewport");
document.getElementsByTagName("head").getItem(0).appendChild(viewport);
JavaScriptObject parentWindow = getParentWindow(wnd);
if (parentWindow != null && isCruxWindow(parentWindow))
{
createViewport(content, parentWindow);
}
}
/**
* Return the parent window from the given window.
* @return
*/
private static native JavaScriptObject getParentWindow(JavaScriptObject wnd)/*-{
return (wnd.parent !== wnd?wnd.parent:null);
}-*/;
/**
* If the window is a crux frame (used in situations like offline loading), return
* true.
* @return
*/
private static native boolean isCruxWindow(JavaScriptObject wnd)/*-{
if (wnd && wnd.__Crux_Frame){
return true;
}
return false;
}-*/;
private static native JavaScriptObject getCurrentWindow()/*-{
return $wnd;
}-*/;
private static native Document getWindowDocument(JavaScriptObject wnd)/*-{
return wnd.document;
}-*/;
}