1 /* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0 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 androidx.transition; 18 19 import android.view.View; 20 21 import androidx.annotation.NonNull; 22 23 interface ViewGroupOverlayImpl extends ViewOverlayImpl { 24 25 /** 26 * Adds a View to the overlay. The bounds of the added view should be 27 * relative to the host view. Any view added to the overlay should be 28 * removed when it is no longer needed or no longer visible. 29 * 30 * <p>Views in the overlay are visual-only; they do not receive input 31 * events and do not participate in focus traversal. Overlay views 32 * are intended to be transient, such as might be needed by a temporary 33 * animation effect.</p> 34 * 35 * <p>If the view has a parent, the view will be removed from that parent 36 * before being added to the overlay. Also, if that parent is attached 37 * in the current view hierarchy, the view will be repositioned 38 * such that it is in the same relative location inside the activity. For 39 * example, if the view's current parent lies 100 pixels to the right 40 * and 200 pixels down from the origin of the overlay's 41 * host view, then the view will be offset by (100, 200).</p> 42 * 43 * @param view The View to be added to the overlay. The added view will be 44 * drawn when the overlay is drawn. 45 * @see #remove(View) 46 * @see android.view.ViewOverlay#add(android.graphics.drawable.Drawable) 47 */ add(@onNull View view)48 void add(@NonNull View view); 49 50 /** 51 * Removes the specified View from the overlay. 52 * 53 * @param view The View to be removed from the overlay. 54 * @see #add(View) 55 * @see android.view.ViewOverlay#remove(android.graphics.drawable.Drawable) 56 */ remove(@onNull View view)57 void remove(@NonNull View view); 58 59 } 60