prefs: Report errors while editing custom layouts

Errors are obtained by running the parser, validation is throttle to
when the user stops editing for a second.

1 files changed, 13 insertions, 0 deletions

diff --git a/srcs/juloo.keyboard2/LayoutsPreference.java b/srcs/juloo.keyboard2/LayoutsPreference.java
index f96af80..313b46f 100644
--- a/srcs/juloo.keyboard2/LayoutsPreference.java
+++ b/srcs/juloo.keyboard2/LayoutsPreference.java
@@ -177,6 +177,19 @@ public class LayoutsPreference extends ListGroupPreference<LayoutsPreference.Lay
             else
               callback.select(new CustomLayout(text));
           }
+
+          public String validate(String text)
+          {
+            try
+            {
+              KeyboardData.load_string_exn(text);
+              return null; // Validation passed
+            }
+            catch (Exception e)
+            {
+              return e.getMessage();
+            }
+          }
         });
   }