/*
* Copyright 2000-2014 Vaadin Ltd.
*
* 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.vaadin.client.extensions.javascriptmanager;
import java.util.HashSet;
import java.util.Set;
import com.google.gwt.core.client.JavaScriptObject;
import com.google.gwt.core.client.JsArray;
import com.google.gwt.json.client.JSONArray;
import com.vaadin.client.ServerConnector;
import com.vaadin.client.communication.JavaScriptMethodInvocation;
import com.vaadin.client.communication.StateChangeEvent;
import com.vaadin.client.extensions.AbstractExtensionConnector;
import com.vaadin.shared.extension.javascriptmanager.ExecuteJavaScriptRpc;
import com.vaadin.shared.extension.javascriptmanager.JavaScriptManagerState;
import com.vaadin.shared.ui.Connect;
import com.vaadin.ui.JavaScript;
@Connect(JavaScript.class)
public class JavaScriptManagerConnector extends AbstractExtensionConnector {
private Set<String> currentNames = new HashSet<String>();
@Override
protected void init() {
registerRpc(ExecuteJavaScriptRpc.class, new ExecuteJavaScriptRpc() {
@Override
public void executeJavaScript(String Script) {
eval(Script);
}
});
}
@Override
public void onStateChanged(StateChangeEvent stateChangeEvent) {
super.onStateChanged(stateChangeEvent);
Set<String> newNames = getState().names;
// Current names now only contains orphan callbacks
currentNames.removeAll(newNames);
for (String name : currentNames) {
removeCallback(name);
}
currentNames = new HashSet<String>(newNames);
for (String name : newNames) {
addCallback(name);
}
}
// TODO Ensure we don't overwrite anything (important) in $wnd
private native void addCallback(String name)
/*-{
var m = this;
var target = $wnd;
var parts = name.split('.');
for(var i = 0; i < parts.length - 1; i++) {
var part = parts[i];
if (target[part] === undefined) {
target[part] = {};
}
target = target[part];
}
target[parts[parts.length - 1]] = $entry(function() {
//Must make a copy because arguments is an array-like object (not instanceof Array), causing suboptimal JSON encoding
var args = Array.prototype.slice.call(arguments, 0);
m.@com.vaadin.client.extensions.javascriptmanager.JavaScriptManagerConnector::sendRpc(Ljava/lang/String;Lcom/google/gwt/core/client/JsArray;)(name, args);
});
}-*/;
// TODO only remove what we actually added
// TODO We might leave empty objects behind, but there's no good way of
// knowing whether they are unused
private native void removeCallback(String name)
/*-{
var target = $wnd;
var parts = name.split('.');
for(var i = 0; i < parts.length - 1; i++) {
var part = parts[i];
if (target[part] === undefined) {
$wnd.console.log(part,'not defined in',target);
// No longer attached -> nothing more to do
return;
}
target = target[part];
}
$wnd.console.log('removing',parts[parts.length - 1],'from',target);
delete target[parts[parts.length - 1]];
}-*/;
private static native void eval(String script)
/*-{
if(script) {
(new $wnd.Function(script)).apply($wnd);
}
}-*/;
public void sendRpc(String name, JsArray<JavaScriptObject> arguments) {
Object[] parameters = new Object[] { name, new JSONArray(arguments) };
/*
* Must invoke manually as the RPC interface can't be used in GWT
* because of the JSONArray parameter
*/
getConnection().addMethodInvocationToQueue(
new JavaScriptMethodInvocation(getConnectorId(),
"com.vaadin.ui.JavaScript$JavaScriptCallbackRpc",
"call", parameters), false, false);
}
@Override
public JavaScriptManagerState getState() {
return (JavaScriptManagerState) super.getState();
}
@Override
protected void extend(ServerConnector target) {
// Nothing to do there as we are not interested in the connector we
// extend (Page i.e. UI)
}
}