Feature #16205: News Feed avoid refresh page when user is commenting

git-svn-id: http://svn.research-infrastructures.eu/public/d4science/gcube/trunk/portlets/user/news-feed@178412 82a268e6-3cf1-43bd-a215-b396298e98cf

src/main/java/org/gcube/portlets/user/newsfeed/client/ui/AddCommentTemplate.java

@@ -66,6 +66,16 @@ public class AddCommentTemplate extends Composite {
 		cancelButton.setVisible(false);
 		commentTextArea.setHeight("30px");
 		commentTextArea.setContext(owner.getVREContext());
+
+		// add onWindowClosing handler to alert the user who didn't share post if really wants to leave
+		Window.addWindowClosingHandler(new Window.ClosingHandler() {
+			public void onWindowClosing(Window.ClosingEvent closingEvent) {
+				String currentText = commentTextArea.getText();
+				if(!currentText.isEmpty()){
+					closingEvent.setMessage("Do you really want to leave the page?");
+				}
+			}
+		});
 	}
 	/**
 	 * called on edit comment
@@ -93,12 +103,23 @@ public class AddCommentTemplate extends Composite {
 		mainPanel.setStyleName("single-comment");
 		commentTextArea.addStyleName("comment-dark-color");
 		submitButton.setText("Edit");
+
+		// add onWindowClosing handler to alert the user who didn't share post if really wants to leave
+		Window.addWindowClosingHandler(new Window.ClosingHandler() {
+			public void onWindowClosing(Window.ClosingEvent closingEvent) {
+				String currentText = commentTextArea.getText();
+				if(!currentText.isEmpty()){
+					closingEvent.setMessage("Do you really want to leave the page?");
+				}
+			}
+		});
 	}
 
 	/** Used by AddCommentTemplate to instantiate SuperPosedTextArea */
 	@UiFactory SuperPosedTextArea build() { 
 		return new SuperPosedTextArea(highlighterDIV);
 	}
+
 	public void setFocus() {
 		commentTextArea.setFocus(true);
 		submitButton.setVisible(true);