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 17package android.support.transition; 18 19import android.view.View; 20import android.view.ViewGroup; 21 22import java.lang.reflect.Field; 23import java.lang.reflect.InvocationTargetException; 24import java.lang.reflect.Method; 25 26class SceneKitKat extends SceneWrapper { 27 28 private static Field sEnterAction; 29 private static Method sSetCurrentScene; 30 31 private View mLayout; // alternative to layoutId 32 33 @Override 34 public void init(ViewGroup sceneRoot) { 35 mScene = new android.transition.Scene(sceneRoot); 36 } 37 38 @Override 39 public void init(ViewGroup sceneRoot, View layout) { 40 if (layout instanceof ViewGroup) { 41 mScene = new android.transition.Scene(sceneRoot, (ViewGroup) layout); 42 } else { 43 mScene = new android.transition.Scene(sceneRoot); 44 mLayout = layout; 45 } 46 } 47 48 @Override 49 public void enter() { 50 if (mLayout != null) { 51 // empty out parent container before adding to it 52 final ViewGroup root = getSceneRoot(); 53 root.removeAllViews(); 54 root.addView(mLayout); 55 invokeEnterAction(); 56 updateCurrentScene(root); 57 } else { 58 mScene.enter(); 59 } 60 } 61 62 private void invokeEnterAction() { 63 if (sEnterAction == null) { 64 try { 65 sEnterAction = android.transition.Scene.class.getDeclaredField("mEnterAction"); 66 sEnterAction.setAccessible(true); 67 } catch (NoSuchFieldException e) { 68 throw new RuntimeException(e); 69 } 70 } 71 try { 72 final Runnable enterAction = (Runnable) sEnterAction.get(mScene); 73 if (enterAction != null) { 74 enterAction.run(); 75 } 76 } catch (IllegalAccessException e) { 77 throw new RuntimeException(e); 78 } 79 } 80 81 /** Sets this Scene as the current scene of the View. */ 82 private void updateCurrentScene(View view) { 83 if (sSetCurrentScene == null) { 84 try { 85 sSetCurrentScene = android.transition.Scene.class.getDeclaredMethod( 86 "setCurrentScene", View.class, android.transition.Scene.class); 87 sSetCurrentScene.setAccessible(true); 88 } catch (NoSuchMethodException e) { 89 throw new RuntimeException(e); 90 } 91 } 92 try { 93 sSetCurrentScene.invoke(null, view, mScene); 94 } catch (IllegalAccessException | InvocationTargetException e) { 95 throw new RuntimeException(e); 96 } 97 } 98 99} 100