Fix declarative support for CustomLayout (#17210)

CustomLayout now has a public default constructor. If a template is not set
using one of the setters, a warning message is displayed like in the case where
the template file is specified but not found.

Change-Id: I5d56f24fafc5c82e6ab76dec393a0c25bd78aae5

1 files changed, 12 insertions, 10 deletions

diff --git a/client/src/com/vaadin/client/ui/customlayout/CustomLayoutConnector.java b/client/src/com/vaadin/client/ui/customlayout/CustomLayoutConnector.java
index 80979587b9..cde1f1af0f 100644
--- a/client/src/com/vaadin/client/ui/customlayout/CustomLayoutConnector.java
+++ b/client/src/com/vaadin/client/ui/customlayout/CustomLayoutConnector.java
@@ -77,22 +77,24 @@ public class CustomLayoutConnector extends AbstractLayoutConnector implements
             // (even though both can never be given at the same time)
             templateContents = getConnection().getResource(
                     "layouts/" + templateName + ".html");
-            if (templateContents == null) {
-                // Template missing -> show debug notice and render components
-                // in order.
-                getWidget()
-                        .getElement()
-                        .setInnerHTML(
-                                "<em>Layout file layouts/"
-                                        + templateName
-                                        + ".html is missing. Components will be drawn for debug purposes.</em>");
-            }
         }
 
         if (templateContents != null) {
             // Template ok -> initialize.
             getWidget().initializeHTML(templateContents,
                     getConnection().getThemeUri());
+        } else {
+            // Template missing -> show debug notice and render components in
+            // order.
+            String warning = templateName != null ? "Layout file layouts/"
+                    + templateName + ".html is missing."
+                    : "Layout file not specified.";
+            getWidget()
+                    .getElement()
+                    .setInnerHTML(
+                            "<em>"
+                                    + warning
+                                    + " Components will be drawn for debug purposes.</em>");
         }
         templateUpdated = true;
     }