package com.googlecode.mgwt.ui.client.util.impl;
import com.google.gwt.core.client.GWT;
import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.dom.client.Document;
import com.google.gwt.event.logical.shared.CloseEvent;
import com.google.gwt.event.logical.shared.CloseHandler;
import com.google.gwt.user.client.Window;
import com.google.web.bindery.event.shared.EventBus;
import com.googlecode.mgwt.dom.client.event.orientation.OrientationChangeEvent;
import com.googlecode.mgwt.dom.client.event.orientation.OrientationChangeEvent.ORIENTATION;
import com.googlecode.mgwt.ui.client.resource.MainResourceAppearance.UtilCss;
import com.googlecode.mgwt.ui.client.resource.MainResourceHolder;
import com.googlecode.mgwt.ui.client.util.OrientationHandler;
public abstract class BaseOrientationHandler implements OrientationHandler {
private static native JavaScriptObject setupOrientation0(
BaseOrientationHandler handler)/*-{
var func = $entry(function() {
handler.@com.googlecode.mgwt.ui.client.util.impl.BaseOrientationHandler::onorientationChange(I)($wnd.orientation);
});
$doc.body.onorientationchange = func;
return func;
}-*/;
private static native void destroyOrientation(JavaScriptObject o)/*-{
$doc.body.onorientationchange = null;
$doc.removeEventListener("orientationChanged", o);
}-*/;
// update styles on body
private static void setClasses(ORIENTATION o) {
UtilCss utilCss = MainResourceHolder.getUtilCss();
switch (o) {
case PORTRAIT:
Document.get().getBody().addClassName(utilCss.portrait());
Document.get().getBody().removeClassName(utilCss.landscape());
break;
case LANDSCAPE:
Document.get().getBody().addClassName(utilCss.landscape());
Document.get().getBody().removeClassName(utilCss.portrait());
break;
default:
break;
}
}
protected static ORIENTATION currentOrientation;
protected static boolean orientationInitialized;
protected JavaScriptObject nativeJsFunction;
private EventBus manager;
@Override
public final void maybeSetupOrientation(EventBus manager) {
this.manager = manager;
if (orientationInitialized)
return;
if (!GWT.isClient()) {
return;
}
doSetupOrientation();
orientationInitialized = true;
setClasses(getOrientation());
}
protected abstract void doSetupOrientation();
protected void setupNativeBrowerOrientationHandler() {
nativeJsFunction = setupOrientation0(this);
Window.addCloseHandler(new CloseHandler<Window>() {
@Override
public void onClose(CloseEvent<Window> event) {
destroyOrientation(nativeJsFunction);
}
});
}
protected static native int getOrientation0()/*-{
if (typeof ($wnd.orientation) == 'undefined') {
return 0;
}
return $wnd.orientation;
}-*/;
protected static ORIENTATION getBrowserOrientation() {
int orientation = getOrientation0();
ORIENTATION o;
switch (orientation) {
case 0:
case 180:
o = ORIENTATION.PORTRAIT;
break;
case 90:
case -90:
o = ORIENTATION.LANDSCAPE;
break;
default:
throw new IllegalStateException("this should not happen!?");
}
return o;
}
void fireOrientationChangedEvent(ORIENTATION orientation) {
setClasses(orientation);
manager.fireEvent(new OrientationChangeEvent(orientation));
}
private void onorientationChange(int orientation) {
ORIENTATION o;
switch (orientation) {
case 0:
case 180:
o = ORIENTATION.PORTRAIT;
break;
case 90:
case -90:
o = ORIENTATION.LANDSCAPE;
break;
default:
o = ORIENTATION.PORTRAIT;
break;
}
currentOrientation = o;
fireOrientationChangedEvent(o);
}
}