1 /* 2 * Copyright (C) 2010 The Android Open Source Project 3 * 4 * Licensed under the Eclipse Public License, Version 1.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.eclipse.org/org/documents/epl-v10.php 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17 package com.android.ide.common.layout; 18 19 import com.android.annotations.NonNull; 20 import com.android.annotations.Nullable; 21 import com.android.ide.common.api.DropFeedback; 22 import com.android.ide.common.api.IDragElement; 23 import com.android.ide.common.api.INode; 24 25 /** 26 * An ignored layout is a layout that should not be treated as a layout by the 27 * visual editor (usually because the widget extends a layout class we recognize 28 * and support, but where the widget is more restrictive in how it manages its 29 * children so we don't want to expose the normal configuration options). 30 * <p> 31 * For example, the ZoomControls widget is not user-configurable as a 32 * LinearLayout even though it extends it. Our ZoomControls rule is therefore a 33 * subclass of this {@link IgnoredLayoutRule} class. 34 */ 35 public abstract class IgnoredLayoutRule extends BaseLayoutRule { 36 @Override 37 public DropFeedback onDropEnter(@NonNull INode targetNode, @Nullable Object targetView, 38 @Nullable IDragElement[] elements) { 39 // Do nothing; this layout rule corresponds to a layout that 40 // should not be handled as a layout by the visual editor - usually 41 // because some widget is extending a layout for implementation purposes 42 // but does not want to expose configurability of the base layout in the 43 // editor. 44 return null; 45 } 46 } 47
