Allow using element resize listeners from javascript connectors (#11996)

Change-Id: I97b280c2e260752be87ce85d2eda81ec4f14d4fe

5 files changed, 290 insertions, 1 deletions

diff --git a/client/src/com/vaadin/client/JavaScriptConnectorHelper.java b/client/src/com/vaadin/client/JavaScriptConnectorHelper.java
index b144603be0..52d2eeb6dc 100644
--- a/client/src/com/vaadin/client/JavaScriptConnectorHelper.java
+++ b/client/src/com/vaadin/client/JavaScriptConnectorHelper.java
@@ -25,11 +25,13 @@ import java.util.Set;
 
 import com.google.gwt.core.client.JavaScriptObject;
 import com.google.gwt.core.client.JsArray;
+import com.google.gwt.dom.client.Element;
 import com.google.gwt.json.client.JSONArray;
-import com.google.gwt.user.client.Element;
 import com.vaadin.client.communication.JavaScriptMethodInvocation;
 import com.vaadin.client.communication.StateChangeEvent;
 import com.vaadin.client.communication.StateChangeEvent.StateChangeHandler;
+import com.vaadin.client.ui.layout.ElementResizeEvent;
+import com.vaadin.client.ui.layout.ElementResizeListener;
 import com.vaadin.shared.JavaScriptConnectorState;
 import com.vaadin.shared.communication.MethodInvocation;
 
@@ -42,6 +44,7 @@ public class JavaScriptConnectorHelper {
 
     private final Map<String, JavaScriptObject> rpcObjects = new HashMap<String, JavaScriptObject>();
     private final Map<String, Set<String>> rpcMethods = new HashMap<String, Set<String>>();
+    private final Map<Element, Map<JavaScriptObject, ElementResizeListener>> resizeListeners = new HashMap<Element, Map<JavaScriptObject, ElementResizeListener>>();
 
     private JavaScriptObject connectorWrapper;
     private int tag;
@@ -204,9 +207,71 @@ public class JavaScriptConnectorHelper {
             'translateVaadinUri': $entry(function(uri) {
                 return c.@com.vaadin.client.ApplicationConnection::translateVaadinUri(Ljava/lang/String;)(uri);
             }),
+            'addResizeListener': function(element, resizeListener) {
+                if (!element || element.nodeType != 1) throw "element must be defined";
+                if (typeof resizeListener != "function") throw "resizeListener must be defined";
+                $entry(h.@com.vaadin.client.JavaScriptConnectorHelper::addResizeListener(*)).call(h, element, resizeListener);
+            },
+            'removeResizeListener': function(element, resizeListener) {
+                if (!element || element.nodeType != 1) throw "element must be defined";
+                if (typeof resizeListener != "function") throw "resizeListener must be defined";
+                $entry(h.@com.vaadin.client.JavaScriptConnectorHelper::removeResizeListener(*)).call(h, element, resizeListener);
+            }
         };
     }-*/;
 
+    // Called from JSNI to add a listener
+    private void addResizeListener(Element element,
+            final JavaScriptObject callbackFunction) {
+        Map<JavaScriptObject, ElementResizeListener> elementListeners = resizeListeners
+                .get(element);
+        if (elementListeners == null) {
+            elementListeners = new HashMap<JavaScriptObject, ElementResizeListener>();
+            resizeListeners.put(element, elementListeners);
+        }
+
+        ElementResizeListener listener = elementListeners.get(callbackFunction);
+        if (listener == null) {
+            LayoutManager layoutManager = LayoutManager.get(connector
+                    .getConnection());
+            listener = new ElementResizeListener() {
+                @Override
+                public void onElementResize(ElementResizeEvent e) {
+                    invokeElementResizeCallback(e.getElement(),
+                            callbackFunction);
+                }
+            };
+            layoutManager.addElementResizeListener(element, listener);
+            elementListeners.put(callbackFunction, listener);
+        }
+    }
+
+    private static native void invokeElementResizeCallback(Element element,
+            JavaScriptObject callbackFunction)
+    /*-{
+        // Call with a simple event object and 'this' pointing to the global scope
+        callbackFunction.call($wnd, {'element': element});
+    }-*/;
+
+    // Called from JSNI to remove a listener
+    private void removeResizeListener(Element element,
+            JavaScriptObject callbackFunction) {
+        Map<JavaScriptObject, ElementResizeListener> listenerMap = resizeListeners
+                .get(element);
+        if (listenerMap == null) {
+            return;
+        }
+
+        ElementResizeListener listener = listenerMap.remove(callbackFunction);
+        if (listener != null) {
+            LayoutManager.get(connector.getConnection())
+                    .removeElementResizeListener(element, listener);
+            if (listenerMap.isEmpty()) {
+                resizeListeners.remove(element);
+            }
+        }
+    }
+
     private native void attachRpcMethod(JavaScriptObject rpc, String iface,
             String method)
     /*-{
@@ -377,6 +442,20 @@ public class JavaScriptConnectorHelper {
 
     public void onUnregister() {
         invokeIfPresent(connectorWrapper, "onUnregister");
+
+        if (!resizeListeners.isEmpty()) {
+            LayoutManager layoutManager = LayoutManager.get(connector
+                    .getConnection());
+            for (Entry<Element, Map<JavaScriptObject, ElementResizeListener>> entry : resizeListeners
+                    .entrySet()) {
+                Element element = entry.getKey();
+                for (ElementResizeListener listener : entry.getValue().values()) {
+                    layoutManager
+                            .removeElementResizeListener(element, listener);
+                }
+            }
+            resizeListeners.clear();
+        }
     }
 
     private static native void invokeIfPresent(
diff --git a/server/src/com/vaadin/ui/AbstractJavaScriptComponent.java b/server/src/com/vaadin/ui/AbstractJavaScriptComponent.java
index 0b3da768c9..6769b6e513 100644
--- a/server/src/com/vaadin/ui/AbstractJavaScriptComponent.java
+++ b/server/src/com/vaadin/ui/AbstractJavaScriptComponent.java
@@ -82,6 +82,16 @@ import com.vaadin.shared.ui.JavaScriptComponentState;
  * <li><code>translateVaadinUri(uri)</code> - Translates a Vaadin URI to a URL
  * that can be used in the browser. This is just way of accessing
  * {@link com.vaadin.client.ApplicationConnection#translateVaadinUri(String)}</li>
+ * <li><code>addResizeListener(element, callbackFunction)</code> - Registers a
+ * listener that gets notified whenever the size of the provided element
+ * changes. The listener is called with one parameter: an event object with the
+ * <code>element</code> property pointing to the element that has been resized.
+ * <li><code>removeResizeListener(element, callbackFunction)</code> -
+ * Unregisters a combination of an element and a listener that has previously
+ * been registered using <code>addResizeListener</code>. All registered
+ * listeners are automatically unregistered when this connector is unregistered,
+ * but this method can be use to to unregister a listener at an earlier point in
+ * time.
  * </ul>
  * The connector wrapper also supports these special functions:
  * <ul>
diff --git a/uitest/src/com/vaadin/tests/components/javascriptcomponent/JavaScriptResizeListener.html b/uitest/src/com/vaadin/tests/components/javascriptcomponent/JavaScriptResizeListener.html
new file mode 100644
index 0000000000..53af1d4ceb
--- /dev/null
+++ b/uitest/src/com/vaadin/tests/components/javascriptcomponent/JavaScriptResizeListener.html
@@ -0,0 +1,81 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
+<html xmlns="http://www.w3.org/1999/xhtml" xml:lang="en" lang="en">
+<head profile="http://selenium-ide.openqa.org/profiles/test-case">
+<meta http-equiv="Content-Type" content="text/html; charset=UTF-8" />
+<link rel="selenium.base" href="" />
+<title>New Test</title>
+</head>
+<body>
+<table cellpadding="1" cellspacing="1" border="1">
+<thead>
+<tr><td rowspan="1" colspan="3">New Test</td></tr>
+</thead><tbody>
+<tr>
+	<td>open</td>
+	<td>/run/com.vaadin.tests.components.javascriptcomponent.JavaScriptResizeListener?restartApplication&amp;debug</td>
+	<td></td>
+</tr>
+<tr>
+	<td>assertText</td>
+	<td>vaadin=runcomvaadintestscomponentsjavascriptcomponentJavaScriptResizeListener::/VVerticalLayout[0]/Slot[1]/VVerticalLayout[0]/Slot[2]/VCssLayout[0]/JavaScriptWidget[0]</td>
+	<td>Initial state</td>
+</tr>
+<!--Changing size has no effect without listener-->
+<tr>
+	<td>click</td>
+	<td>vaadin=runcomvaadintestscomponentsjavascriptcomponentJavaScriptResizeListener::/VVerticalLayout[0]/Slot[1]/VVerticalLayout[0]/Slot[0]/VButton[0]/domChild[0]/domChild[0]</td>
+	<td></td>
+</tr>
+<tr>
+	<td>assertText</td>
+	<td>vaadin=runcomvaadintestscomponentsjavascriptcomponentJavaScriptResizeListener::/VVerticalLayout[0]/Slot[1]/VVerticalLayout[0]/Slot[2]/VCssLayout[0]/JavaScriptWidget[0]</td>
+	<td>Initial state</td>
+</tr>
+<!--Reports the size when the listener is added-->
+<tr>
+	<td>mouseClick</td>
+	<td>vaadin=runcomvaadintestscomponentsjavascriptcomponentJavaScriptResizeListener::/VVerticalLayout[0]/Slot[1]/VVerticalLayout[0]/Slot[1]/VCheckBox[0]/domChild[0]</td>
+	<td>52,4</td>
+</tr>
+<tr>
+	<td>assertText</td>
+	<td>vaadin=runcomvaadintestscomponentsjavascriptcomponentJavaScriptResizeListener::/VVerticalLayout[0]/Slot[1]/VVerticalLayout[0]/Slot[2]/VCssLayout[0]/JavaScriptWidget[0]</td>
+	<td>Current size is 200 x 50</td>
+</tr>
+<!--Size change is detected when listener is active-->
+<tr>
+	<td>click</td>
+	<td>vaadin=runcomvaadintestscomponentsjavascriptcomponentJavaScriptResizeListener::/VVerticalLayout[0]/Slot[1]/VVerticalLayout[0]/Slot[0]/VButton[0]/domChild[0]</td>
+	<td></td>
+</tr>
+<tr>
+	<td>assertText</td>
+	<td>vaadin=runcomvaadintestscomponentsjavascriptcomponentJavaScriptResizeListener::/VVerticalLayout[0]/Slot[1]/VVerticalLayout[0]/Slot[2]/VCssLayout[0]/JavaScriptWidget[0]</td>
+	<td>Current size is 100 x 100</td>
+</tr>
+<tr>
+	<td>mouseClick</td>
+	<td>vaadin=runcomvaadintestscomponentsjavascriptcomponentJavaScriptResizeListener::/VVerticalLayout[0]/Slot[1]/VVerticalLayout[0]/Slot[1]/VCheckBox[0]/domChild[0]</td>
+	<td>69,2</td>
+</tr>
+<tr>
+	<td>assertText</td>
+	<td>vaadin=runcomvaadintestscomponentsjavascriptcomponentJavaScriptResizeListener::/VVerticalLayout[0]/Slot[1]/VVerticalLayout[0]/Slot[2]/VCssLayout[0]/JavaScriptWidget[0]</td>
+	<td>Listener disabled</td>
+</tr>
+<!--Nothing happens when changing size after removing listener-->
+<tr>
+	<td>click</td>
+	<td>vaadin=runcomvaadintestscomponentsjavascriptcomponentJavaScriptResizeListener::/VVerticalLayout[0]/Slot[1]/VVerticalLayout[0]/Slot[0]/VButton[0]/domChild[0]/domChild[0]</td>
+	<td></td>
+</tr>
+<tr>
+	<td>assertText</td>
+	<td>vaadin=runcomvaadintestscomponentsjavascriptcomponentJavaScriptResizeListener::/VVerticalLayout[0]/Slot[1]/VVerticalLayout[0]/Slot[2]/VCssLayout[0]/JavaScriptWidget[0]</td>
+	<td>Listener disabled</td>
+</tr>
+
+</tbody></table>
+</body>
+</html>
diff --git a/uitest/src/com/vaadin/tests/components/javascriptcomponent/JavaScriptResizeListener.java b/uitest/src/com/vaadin/tests/components/javascriptcomponent/JavaScriptResizeListener.java
new file mode 100644
index 0000000000..9d0094b833
--- /dev/null
+++ b/uitest/src/com/vaadin/tests/components/javascriptcomponent/JavaScriptResizeListener.java
@@ -0,0 +1,96 @@
+/*
+ * Copyright 2000-2013 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.tests.components.javascriptcomponent;
+
+import com.vaadin.annotations.JavaScript;
+import com.vaadin.data.Property;
+import com.vaadin.server.VaadinRequest;
+import com.vaadin.tests.components.AbstractTestUI;
+import com.vaadin.ui.AbstractJavaScriptComponent;
+import com.vaadin.ui.Button;
+import com.vaadin.ui.Button.ClickEvent;
+import com.vaadin.ui.CheckBox;
+import com.vaadin.ui.CssLayout;
+
+public class JavaScriptResizeListener extends AbstractTestUI {
+
+    @JavaScript("ResizeJsConnector.js")
+    public class ResizeJsComponent extends AbstractJavaScriptComponent {
+        public void setListenerEnabled(boolean enabled) {
+            callFunction("setListenerEnabled", Boolean.valueOf(enabled));
+        }
+    }
+
+    private final ResizeJsComponent resizeJsComponent = new ResizeJsComponent();
+
+    private final CssLayout holder = new CssLayout();
+
+    @Override
+    protected void setup(VaadinRequest request) {
+
+        addComponent(new Button("Change holder size",
+                new Button.ClickListener() {
+                    @Override
+                    public void buttonClick(ClickEvent event) {
+                        updateHolderSize();
+                    }
+                }));
+        addComponent(new CheckBox("Listener active") {
+            {
+                setImmediate(true);
+                addValueChangeListener(new ValueChangeListener() {
+                    @Override
+                    public void valueChange(Property.ValueChangeEvent event) {
+                        resizeJsComponent.setListenerEnabled(event
+                                .getProperty().getValue() == Boolean.TRUE);
+                    }
+                });
+            }
+        });
+
+        updateHolderSize();
+        addComponent(holder);
+
+        resizeJsComponent.setSizeFull();
+        holder.addComponent(resizeJsComponent);
+    }
+
+    private void updateHolderSize() {
+        if (holder.getHeight() == 100) {
+            holder.setHeight("50px");
+        } else {
+            holder.setHeight("100px");
+        }
+
+        if (holder.getWidth() == 100) {
+            holder.setWidth("200px");
+        } else {
+            holder.setWidth("100px");
+        }
+    }
+
+    @Override
+    protected String getTestDescription() {
+        return "Test for getting resize events for javascript components";
+    }
+
+    @Override
+    protected Integer getTicketNumber() {
+        return Integer.valueOf(11996);
+    }
+
+}
diff --git a/uitest/src/com/vaadin/tests/components/javascriptcomponent/ResizeJsConnector.js b/uitest/src/com/vaadin/tests/components/javascriptcomponent/ResizeJsConnector.js
new file mode 100644
index 0000000000..4e871aa1b7
--- /dev/null
+++ b/uitest/src/com/vaadin/tests/components/javascriptcomponent/ResizeJsConnector.js
@@ -0,0 +1,23 @@
+function com_vaadin_tests_components_javascriptcomponent_JavaScriptResizeListener_ResizeJsComponent() {
+	var self = this;
+	var e = this.getElement();
+	
+	var setText = function(text) {
+		e.innerHTML = text;
+	}
+	setText('Initial state');
+	
+	var resizeListener = function(event) {
+		setText('Current size is ' + event.element.offsetWidth + " x " + event.element.offsetHeight);
+	};
+	
+	this.setListenerEnabled = function(enabled) {
+		if (enabled) {
+			setText("Listener enabled");
+			self.addResizeListener(e, resizeListener);			
+		} else {
+			setText("Listener disabled");
+			self.removeResizeListener(e, resizeListener);			
+		}
+	}
+}
\ No newline at end of file