/*
* Copyright (C) 2016 The Android Open Source Project
*
* Licensed under the Apache License, Version 2.0 (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.apache.org/licenses/LICENSE-2.0
*
* 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 android.support.transition;
import android.view.View;
import android.view.ViewGroup;
import java.lang.reflect.Field;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import android.annotation.TargetApi;
import android.support.annotation.RequiresApi;
@RequiresApi(19)
@TargetApi(19)
class SceneKitKat extends SceneWrapper {
private static Field sEnterAction;
private static Method sSetCurrentScene;
private View mLayout; // alternative to layoutId
@Override
public void init(ViewGroup sceneRoot) {
mScene = new android.transition.Scene(sceneRoot);
}
@Override
public void init(ViewGroup sceneRoot, View layout) {
if (layout instanceof ViewGroup) {
mScene = new android.transition.Scene(sceneRoot, (ViewGroup) layout);
} else {
mScene = new android.transition.Scene(sceneRoot);
mLayout = layout;
}
}
@Override
public void enter() {
if (mLayout != null) {
// empty out parent container before adding to it
final ViewGroup root = getSceneRoot();
root.removeAllViews();
root.addView(mLayout);
invokeEnterAction();
updateCurrentScene(root);
} else {
mScene.enter();
}
}
private void invokeEnterAction() {
if (sEnterAction == null) {
try {
sEnterAction = android.transition.Scene.class.getDeclaredField("mEnterAction");
sEnterAction.setAccessible(true);
} catch (NoSuchFieldException e) {
throw new RuntimeException(e);
}
}
try {
final Runnable enterAction = (Runnable) sEnterAction.get(mScene);
if (enterAction != null) {
enterAction.run();
}
} catch (IllegalAccessException e) {
throw new RuntimeException(e);
}
}
/** Sets this Scene as the current scene of the View. */
private void updateCurrentScene(View view) {
if (sSetCurrentScene == null) {
try {
sSetCurrentScene = android.transition.Scene.class.getDeclaredMethod(
"setCurrentScene", View.class, android.transition.Scene.class);
sSetCurrentScene.setAccessible(true);
} catch (NoSuchMethodException e) {
throw new RuntimeException(e);
}
}
try {
sSetCurrentScene.invoke(null, view, mScene);
} catch (IllegalAccessException | InvocationTargetException e) {
throw new RuntimeException(e);
}
}
}