disable button until core initialized

gui/griffon-app/lifecycle/Ready.groovy

@@ -12,6 +12,8 @@ import javax.inject.Inject
 import static griffon.util.GriffonApplicationUtils.isMacOSX
 import static groovy.swing.SwingBuilder.lookAndFeel
 
+import java.beans.PropertyChangeEvent
+
 @Log
 class Ready extends AbstractLifecycleHandler {
     @Inject
@@ -48,6 +50,9 @@ class Ready extends AbstractLifecycleHandler {
         Core core = new Core(props, home)
         core.startServices()
         application.context.put("core",core)
+        application.getPropertyChangeListeners("core").each { 
+            it.propertyChange(new PropertyChangeEvent(this, "core", null, core)) 
+        }
     }
 }
 

gui/griffon-app/models/com/muwire/gui/EventListModel.groovy

@@ -1,10 +1,27 @@
 package com.muwire.gui
 
+import javax.annotation.Nonnull
+import javax.inject.Inject
+import javax.inject.Named
+
+import com.muwire.core.Core
+
 import griffon.core.artifact.GriffonModel
+import griffon.core.GriffonApplication
+import griffon.inject.Contextual
+import griffon.inject.MVCMember
 import griffon.transform.Observable
 import griffon.metadata.ArtifactProviderFor
 
 @ArtifactProviderFor(GriffonModel)
 class EventListModel {
+    @Inject @Nonnull GriffonApplication application
     @Observable int clickCount = 0
+    @Observable boolean coreInitialized = false
+    
+    void mvcGroupInit(Map<String, Object> args) {
+        application.addPropertyChangeListener("core", {e -> 
+            coreInitialized = (e.getNewValue() != null) 
+        })
+    }
 }

gui/griffon-app/views/com/muwire/gui/EventListView.groovy

@@ -24,7 +24,7 @@ class EventListView {
                 gridLayout(rows: 2, cols: 1)
                 label(id: 'clickLabel', text: bind { model.clickCount },
                      horizontalAlignment: SwingConstants.CENTER)
-                button(id: 'clickButton', clickAction)
+                button(id: 'clickButton', clickAction, enabled: bind {model.coreInitialized})
             }
         }
     }