Fire attach/detach events when Window is added/removed from UI (#14908).

Change-Id: Idc51aa5ab97a9d3f7a1f316d9536ae1cbaeafe38

server/src/com/vaadin/ui/UI.java

@@ -499,6 +499,7 @@ public abstract class UI extends AbstractSingleComponentContainer implements
     private void attachWindow(Window w) {
         windows.add(w);
         w.setParent(this);
+        fireComponentAttachEvent(w);
         markAsDirty();
     }
 
@@ -523,6 +524,7 @@ public abstract class UI extends AbstractSingleComponentContainer implements
         window.setParent(null);
         markAsDirty();
         window.fireClose();
+        fireComponentDetachEvent(window);
 
         return true;
     }

server/tests/src/com/vaadin/tests/server/component/window/AttachDetachWindow.java

@@ -3,12 +3,17 @@ package com.vaadin.tests.server.component.window;
 import static org.junit.Assert.assertSame;
 import static org.junit.Assert.assertTrue;
 
+import org.junit.Assert;
 import org.junit.Test;
 
 import com.vaadin.server.ClientConnector;
 import com.vaadin.server.VaadinRequest;
 import com.vaadin.server.VaadinSession;
 import com.vaadin.tests.util.AlwaysLockedVaadinSession;
+import com.vaadin.ui.HasComponents.ComponentAttachEvent;
+import com.vaadin.ui.HasComponents.ComponentAttachListener;
+import com.vaadin.ui.HasComponents.ComponentDetachEvent;
+import com.vaadin.ui.HasComponents.ComponentDetachListener;
 import com.vaadin.ui.Label;
 import com.vaadin.ui.UI;
 import com.vaadin.ui.VerticalLayout;
@@ -213,6 +218,45 @@ public class AttachDetachWindow {
         assertDetached(sub);
     }
 
+    @Test
+    public void addWindow_attachEventIsFired() {
+        TestUI ui = new TestUI();
+        final Window window = new Window();
+
+        final boolean[] eventFired = new boolean[1];
+        ui.addComponentAttachListener(new ComponentAttachListener() {
+
+            @Override
+            public void componentAttachedToContainer(ComponentAttachEvent event) {
+                eventFired[0] = event.getAttachedComponent().equals(window);
+            }
+        });
+        ui.addWindow(window);
+        Assert.assertTrue("Attach event is not fired for added window",
+                eventFired[0]);
+    }
+
+    @Test
+    public void removeWindow_detachEventIsFired() {
+        TestUI ui = new TestUI();
+        final Window window = new Window();
+
+        final boolean[] eventFired = new boolean[1];
+        ui.addComponentDetachListener(new ComponentDetachListener() {
+
+            @Override
+            public void componentDetachedFromContainer(
+                    ComponentDetachEvent event) {
+                eventFired[0] = event.getDetachedComponent().equals(window);
+            }
+        });
+        ui.addWindow(window);
+        ui.removeWindow(window);
+
+        Assert.assertTrue("Detach event is not fired for removed window",
+                eventFired[0]);
+    }
+
     /**
      * Asserts that win and its children are attached to testApp and their
      * attach() methods have been called.