| /* |
| * 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; |
| } |
| } |