Drag image for text-area should contain text of text-area (#13557).

Change-Id: I4c3da88e80b5516bc8f6dc0eb8020ca4dcdf43fc

3 files changed, 83 insertions, 1 deletions

diff --git a/client/src/com/vaadin/client/ui/VTextArea.java b/client/src/com/vaadin/client/ui/VTextArea.java
index 2a697969df..5150ab2544 100644
--- a/client/src/com/vaadin/client/ui/VTextArea.java
+++ b/client/src/com/vaadin/client/ui/VTextArea.java
@@ -17,6 +17,7 @@
 package com.vaadin.client.ui;
 
 import com.google.gwt.core.client.Scheduler;
+import com.google.gwt.dom.client.Element;
 import com.google.gwt.dom.client.Style.Overflow;
 import com.google.gwt.dom.client.Style.WhiteSpace;
 import com.google.gwt.dom.client.TextAreaElement;
@@ -30,6 +31,7 @@ import com.google.gwt.user.client.DOM;
 import com.google.gwt.user.client.Event;
 import com.vaadin.client.BrowserInfo;
 import com.vaadin.client.Util;
+import com.vaadin.client.ui.dd.VDragCloneAware;
 
 /**
  * This class represents a multiline textfield (textarea).
@@ -40,7 +42,7 @@ import com.vaadin.client.Util;
  * @author Vaadin Ltd.
  * 
  */
-public class VTextArea extends VTextField {
+public class VTextArea extends VTextField implements VDragCloneAware {
     public static final String CLASSNAME = "v-textarea";
     private boolean wordwrap = true;
     private MaxLengthHandler maxLengthHandler = new MaxLengthHandler();
@@ -294,4 +296,14 @@ public class VTextArea extends VTextField {
         // class instead of directly each other.
     }
 
+    @Override
+    public void initDragImageCopy(Element element) {
+        // Fix for #13557 - drag image doesn't show original text area text.
+        // It happens because "value" property is not copied into the cloned
+        // element
+        String value = getElement().getPropertyString("value");
+        if (value != null) {
+            element.setPropertyString("value", value);
+        }
+    }
 }
diff --git a/client/src/com/vaadin/client/ui/dd/VDragCloneAware.java b/client/src/com/vaadin/client/ui/dd/VDragCloneAware.java
new file mode 100644
index 0000000000..53bc206588
--- /dev/null
+++ b/client/src/com/vaadin/client/ui/dd/VDragCloneAware.java
@@ -0,0 +1,39 @@
+/*
+ * 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.client.ui.dd;
+
+import com.google.gwt.dom.client.Element;
+
+/**
+ * Widget could implement this interface if drag image requires additional
+ * initialization/configuration. Method {@link #initDragImageCopy(Element)}
+ * allows to change/correct drag image element when element is dragged via DnD.
+ * 
+ * @since 7.3
+ * @author Vaadin Ltd
+ */
+public interface VDragCloneAware {
+
+    /**
+     * This method is called for cloned <code>element</code> which corresponds
+     * to the widget element. One could modify/correct this <code>element</code>
+     * for drag image.
+     * 
+     * @param element
+     *            cloned element of drag image
+     */
+    void initDragImageCopy(Element element);
+}
diff --git a/client/src/com/vaadin/client/ui/dd/VDragEvent.java b/client/src/com/vaadin/client/ui/dd/VDragEvent.java
index 9b592cfcbd..d3fe402cee 100644
--- a/client/src/com/vaadin/client/ui/dd/VDragEvent.java
+++ b/client/src/com/vaadin/client/ui/dd/VDragEvent.java
@@ -21,11 +21,14 @@ import java.util.Map;
 import com.google.gwt.dom.client.Document;
 import com.google.gwt.dom.client.Element;
 import com.google.gwt.dom.client.NativeEvent;
+import com.google.gwt.dom.client.Node;
 import com.google.gwt.dom.client.Style.Unit;
 import com.google.gwt.dom.client.TableElement;
 import com.google.gwt.dom.client.TableSectionElement;
 import com.google.gwt.event.dom.client.MouseOverEvent;
 import com.google.gwt.user.client.DOM;
+import com.google.gwt.user.client.Event;
+import com.google.gwt.user.client.EventListener;
 import com.vaadin.client.BrowserInfo;
 import com.vaadin.client.Util;
 
@@ -241,6 +244,7 @@ public class VDragEvent {
     public void createDragImage(com.google.gwt.user.client.Element element,
             boolean alignImageToEvent) {
         Element cloneNode = (Element) element.cloneNode(true);
+        syncContent(element, cloneNode);
         if (BrowserInfo.get().isIE()) {
             if (cloneNode.getTagName().toLowerCase().equals("tr")) {
                 TableElement table = Document.get().createTableElement();
@@ -277,4 +281,31 @@ public class VDragEvent {
         createDragImage(DOM.asOld(element), alignImageToEvent);
     }
 
+    /**
+     * Do additional content sync between <code>original</code> element and its
+     * <code>copy</code> if needed.
+     * 
+     * @since 7.3
+     * @param original
+     *            original element
+     * @param copy
+     *            copy of original element
+     */
+    protected void syncContent(Element original, Element copy) {
+        for (int i = 0; i < original.getChildCount(); i++) {
+            Node child = original.getChild(i);
+            if (child instanceof Element) {
+                syncContent((Element) child, (Element) copy.getChild(i));
+            }
+        }
+        doSyncContent(original, copy);
+    }
+
+    private void doSyncContent(Element original, Element copy) {
+        EventListener eventListener = Event.getEventListener(original);
+        if (eventListener instanceof VDragCloneAware) {
+            ((VDragCloneAware) eventListener).initDragImageCopy(copy);
+        }
+    }
+
 }