change visibility property editor from a chackbox to a dropdown

appinventor/appengine/src/com/google/appinventor/client/editor/youngandroid/palette/YoungAndroidPalettePanel.java

@@ -2,7 +2,10 @@
 
 package com.google.appinventor.client.editor.youngandroid.palette;
 
-import com.google.appinventor.client.Ode;
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.Map;
+
 import com.google.appinventor.client.editor.simple.SimpleComponentDatabase;
 import com.google.appinventor.client.editor.simple.components.MockComponent;
 import com.google.appinventor.client.editor.simple.palette.DropTargetProvider;
@@ -21,6 +24,7 @@ import com.google.appinventor.client.editor.youngandroid.properties.YoungAndroid
 import com.google.appinventor.client.editor.youngandroid.properties.YoungAndroidScreenOrientationChoicePropertyEditor;
 import com.google.appinventor.client.editor.youngandroid.properties.YoungAndroidSensorDistIntervalChoicePropertyEditor;
 import com.google.appinventor.client.editor.youngandroid.properties.YoungAndroidSensorTimeIntervalChoicePropertyEditor;
+import com.google.appinventor.client.editor.youngandroid.properties.YoungAndroidVisibilityChoicePropertyEditor;
 import com.google.appinventor.client.widgets.properties.FloatPropertyEditor;
 import com.google.appinventor.client.widgets.properties.IntegerPropertyEditor;
 import com.google.appinventor.client.widgets.properties.NonNegativeFloatPropertyEditor;
@@ -36,10 +40,6 @@ import com.google.gwt.user.client.ui.Composite;
 import com.google.gwt.user.client.ui.StackPanel;
 import com.google.gwt.user.client.ui.VerticalPanel;
 
-import java.util.Collections;
-import java.util.HashMap;
-import java.util.Map;
-
 /**
  * Panel showing Simple components which can be dropped onto the Young Android
  * visual designer panel.
@@ -180,6 +180,8 @@ public class YoungAndroidPalettePanel extends Composite implements SimplePalette
       return new YoungAndroidAlignmentChoicePropertyEditor();
     } else if (editorType.equals(PropertyTypeConstants.PROPERTY_TYPE_TYPEFACE)) {
       return new YoungAndroidFontTypefaceChoicePropertyEditor();
+    } else if (editorType.equals(PropertyTypeConstants.PROPERTY_TYPE_VISIBILITY)) {
+      return new YoungAndroidVisibilityChoicePropertyEditor();
     } else {
       return new TextPropertyEditor();
     }

appinventor/appengine/src/com/google/appinventor/client/editor/youngandroid/properties/YoungAndroidVisibilityChoicePropertyEditor.java

+// Copyright 2012 MIT. All Rights Reserved.
+
+package com.google.appinventor.client.editor.youngandroid.properties;
+
+
+import com.google.appinventor.client.widgets.properties.ChoicePropertyEditor;
+
+
+/**
+ * Property editor for visibility: selects showing or hidden
+ * 
+ * @author hal@mit.edu (Hal Abelson)
+ */
+public class YoungAndroidVisibilityChoicePropertyEditor extends ChoicePropertyEditor {
+
+  //TODO(hal): The values must be True and False. Losercase true and fale do not work here:
+  // they are not transformed from strings to booleans when passed to the property.
+  // Figure out why not.
+  
+  private static final Choice[] visibility = new Choice[] {
+    new Choice("showing", "True"),
+    new Choice("hidden", "False"),
+  };
+
+  public YoungAndroidVisibilityChoicePropertyEditor() {
+    super(visibility);
+  }
+}

appinventor/components/src/com/google/appinventor/components/common/PropertyTypeConstants.java

@@ -131,4 +131,10 @@ public class PropertyTypeConstants {
    * com.google.appinventor.client.editor.youngandroid.properties.YoungAndroidFontTypefaceChoicePropertyEditor}.
    */
   public static final String PROPERTY_TYPE_TYPEFACE = "typeface";
+  
+  /**
+   * Choices of visibility for view components offered by {@link
+   * com.google.appinventor.client.editor.youngandroid.properties.YoungAndroidVisibilityChoicePropertyEditor}.
+   */
+  public static final String PROPERTY_TYPE_VISIBILITY = "visibility";
 }

appinventor/components/src/com/google/appinventor/components/runtime/AndroidViewComponent.java

@@ -47,22 +47,25 @@ public abstract class AndroidViewComponent extends VisibleComponent {
    * Returns true iff the component is visible.
    * @return  true iff the component is visible
    */
-  @SimpleProperty(description = "Whether the component is visible",
+  @SimpleProperty(
       category = PropertyCategory.APPEARANCE)
   public boolean Visible() {
     return getView().getVisibility() == View.VISIBLE;
   }
 
   /**
-   * Specifies whether the component should be visible
+   * Specifies whether the component should be visible on the screen.  Value is true if the 
+   * component is showing and false if hidden.
    * @param  visible desired state
    */
-  @DesignerProperty(editorType = PropertyTypeConstants.PROPERTY_TYPE_BOOLEAN, defaultValue = "True")
-  @SimpleProperty
-  public void Visible(boolean visible) {
+  @DesignerProperty(editorType = PropertyTypeConstants.PROPERTY_TYPE_VISIBILITY,
+      defaultValue = "True")
+  @SimpleProperty(description = "Specifies whether the component should be visible on the screen. "
+      + "Value is true if the component is showing and false if hidden.")
+  public void Visible(Boolean visibility) {
     // The principle of least astonishment suggests we not offer the
     // Android option INVISIBLE.
-    getView().setVisibility(visible ? View.VISIBLE : View.GONE);
+    getView().setVisibility(visibility ? View.VISIBLE : View.GONE);
   }
 
   /**