Add editor open event to Grid Editor (#9623)

Fixes #9596

4 files changed, 137 insertions, 0 deletions

diff --git a/server/src/main/java/com/vaadin/ui/components/grid/Editor.java b/server/src/main/java/com/vaadin/ui/components/grid/Editor.java
index 0eff213c7e..26ef8101ab 100644
--- a/server/src/main/java/com/vaadin/ui/components/grid/Editor.java
+++ b/server/src/main/java/com/vaadin/ui/components/grid/Editor.java
@@ -177,6 +177,17 @@ public interface Editor<T> extends Serializable {
     public Registration addCancelListener(EditorCancelListener<T> listener);
 
     /**
+     * Adds an editor open {@code listener}.
+     * 
+     * @param listener
+     *            open listener
+     * @return a registration object for removing the listener
+     * 
+     * @since 8.1
+     */
+    public Registration addOpenListener(EditorOpenListener<T> listener);
+
+    /**
      * Gets the Grid instance which this editor belongs to.
      * 
      * @return the grid which owns the editor
diff --git a/server/src/main/java/com/vaadin/ui/components/grid/EditorImpl.java b/server/src/main/java/com/vaadin/ui/components/grid/EditorImpl.java
index 07b792a221..502f530d9a 100644
--- a/server/src/main/java/com/vaadin/ui/components/grid/EditorImpl.java
+++ b/server/src/main/java/com/vaadin/ui/components/grid/EditorImpl.java
@@ -238,6 +238,8 @@ public class EditorImpl<T> extends AbstractGridExtension<T>
                     getState().columnFields.put(getInternalIdForColumn(c),
                             component.getConnectorId());
                 });
+
+        eventRouter.fireEvent(new EditorOpenEvent<T>(this, edited));
     }
 
     @Override
@@ -346,6 +348,12 @@ public class EditorImpl<T> extends AbstractGridExtension<T>
     }
 
     @Override
+    public Registration addOpenListener(EditorOpenListener<T> listener) {
+        return eventRouter.addListener(EditorOpenEvent.class, listener,
+                EditorOpenListener.class.getDeclaredMethods()[0]);
+    }
+
+    @Override
     public Grid<T> getGrid() {
         return getParent();
     }
diff --git a/server/src/main/java/com/vaadin/ui/components/grid/EditorOpenEvent.java b/server/src/main/java/com/vaadin/ui/components/grid/EditorOpenEvent.java
new file mode 100644
index 0000000000..70e0423991
--- /dev/null
+++ b/server/src/main/java/com/vaadin/ui/components/grid/EditorOpenEvent.java
@@ -0,0 +1,74 @@
+/*
+ * Copyright 2000-2016 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.ui.components.grid;
+
+import java.util.EventObject;
+
+import com.vaadin.ui.Grid;
+
+/**
+ * An event that is fired when a Grid editor is opened.
+ *
+ * @author Vaadin Ltd
+ * @since 8.1
+ *
+ * @see EditorOpenListener
+ * @see Editor#addOpenListener(EditorOpenListener)
+ *
+ * @param <T>
+ *            the bean type
+ */
+public class EditorOpenEvent<T> extends EventObject {
+
+    private T bean;
+
+    /**
+     * Constructor for a editor open event.
+     *
+     * @param editor
+     *            the source of the event
+     * @param bean
+     *            the bean being edited
+     */
+    public EditorOpenEvent(Editor<T> editor, T bean) {
+        super(editor);
+        this.bean = bean;
+    }
+
+    @SuppressWarnings("unchecked")
+    @Override
+    public Editor<T> getSource() {
+        return (Editor<T>) super.getSource();
+    }
+
+    /**
+     * Gets the editors' grid.
+     *
+     * @return the editors' grid
+     */
+    public Grid<T> getGrid() {
+        return getSource().getGrid();
+    }
+
+    /**
+     * Gets the bean being edited.
+     *
+     * @return the bean being edited
+     */
+    public T getBean() {
+        return bean;
+    }
+}
diff --git a/server/src/main/java/com/vaadin/ui/components/grid/EditorOpenListener.java b/server/src/main/java/com/vaadin/ui/components/grid/EditorOpenListener.java
new file mode 100644
index 0000000000..071ed0549a
--- /dev/null
+++ b/server/src/main/java/com/vaadin/ui/components/grid/EditorOpenListener.java
@@ -0,0 +1,44 @@
+/*
+ * Copyright 2000-2016 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.ui.components.grid;
+
+import java.io.Serializable;
+
+import com.vaadin.ui.Grid;
+
+/**
+ * An event listener for a {@link Grid} editor save events.
+ * 
+ * @author Vaadin Ltd
+ * @since 8.1
+ * 
+ * @param <T>
+ *            the bean type
+ *
+ * @see EditorOpenEvent
+ * @see Editor#addOpenListener(EditorOpenListener)
+ */
+@FunctionalInterface
+public interface EditorOpenListener<T> extends Serializable {
+
+    /**
+     * Called when the editor is opened.
+     * 
+     * @param event
+     *            open event
+     */
+    public void onEditorOpen(EditorOpenEvent<T> event);
+}