1 files changed, 46 insertions, 0 deletions
diff --git a/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/common/layout/IgnoredLayoutRule.java b/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/common/layout/IgnoredLayoutRule.java
new file mode 100644
index 000000000..3a65a8601
--- /dev/null
+++ b/eclipse/plugins/com.android.ide.eclipse.adt/src/com/android/ide/common/layout/IgnoredLayoutRule.java
@@ -0,0 +1,46 @@
+/*
+ * Copyright (C) 2010 The Android Open Source Project
+ *
+ * Licensed under the Eclipse Public License, Version 1.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.eclipse.org/org/documents/epl-v10.php
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package com.android.ide.common.layout;
+
+import com.android.annotations.NonNull;
+import com.android.annotations.Nullable;
+import com.android.ide.common.api.DropFeedback;
+import com.android.ide.common.api.IDragElement;
+import com.android.ide.common.api.INode;
+
+/**
+ * An ignored layout is a layout that should not be treated as a layout by the
+ * visual editor (usually because the widget extends a layout class we recognize
+ * and support, but where the widget is more restrictive in how it manages its
+ * children so we don't want to expose the normal configuration options).
+ * <p>
+ * For example, the ZoomControls widget is not user-configurable as a
+ * LinearLayout even though it extends it. Our ZoomControls rule is therefore a
+ * subclass of this {@link IgnoredLayoutRule} class.
+ */
+public abstract class IgnoredLayoutRule extends BaseLayoutRule {
+    @Override
+    public DropFeedback onDropEnter(@NonNull INode targetNode, @Nullable Object targetView,
+            @Nullable IDragElement[] elements) {
+        // Do nothing; this layout rule corresponds to a layout that
+        // should not be handled as a layout by the visual editor - usually
+        // because some widget is extending a layout for implementation purposes
+        // but does not want to expose configurability of the base layout in the
+        // editor.
+        return null;
+    }
+}