/*
* Copyright (C) 2014 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.v4.app;
import java.util.ArrayList;
import java.util.Map;
import android.annotation.TargetApi;
import android.graphics.Rect;
import android.os.Build;
import android.transition.Transition;
import android.transition.TransitionManager;
import android.transition.TransitionSet;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewTreeObserver;
@TargetApi(Build.VERSION_CODES.KITKAT)
class FragmentTransitionCompat21 {
public static String getTransitionName(View view) {
return view.getTransitionName();
}
public static Object cloneTransition(Object transition) {
if (transition != null) {
transition = ((Transition)transition).clone();
}
return transition;
}
public static Object captureExitingViews(Object exitTransition, View root,
ArrayList<View> viewList, Map<String, View> namedViews) {
if (exitTransition != null) {
captureTransitioningViews(viewList, root);
if (namedViews != null) {
viewList.removeAll(namedViews.values());
}
if (viewList.isEmpty()) {
exitTransition = null;
} else {
addTargets((Transition) exitTransition, viewList);
}
}
return exitTransition;
}
public static void excludeTarget(Object transitionObject, View view, boolean exclude) {
Transition transition = (Transition) transitionObject;
transition.excludeTarget(view, exclude);
}
public static void beginDelayedTransition(ViewGroup sceneRoot, Object transitionObject) {
Transition transition = (Transition) transitionObject;
TransitionManager.beginDelayedTransition(sceneRoot, transition);
}
public static void setEpicenter(Object transitionObject, View view) {
Transition transition = (Transition) transitionObject;
final Rect epicenter = getBoundsOnScreen(view);
transition.setEpicenterCallback(new Transition.EpicenterCallback() {
@Override
public Rect onGetEpicenter(Transition transition) {
return epicenter;
}
});
}
/**
* Prepares the enter transition by adding a non-existent view to the transition's target list
* and setting it epicenter callback. By adding a non-existent view to the target list,
* we can prevent any view from being targeted at the beginning of the transition.
* We will add to the views before the end state of the transition is captured so that the
* views will appear. At the start of the transition, we clear the list of targets so that
* we can restore the state of the transition and use it again.
*
* <p>The shared element transition maps its shared elements immediately prior to
* capturing the final state of the Transition.</p>
*/
public static void addTransitionTargets(Object enterTransitionObject,
Object sharedElementTransitionObject, final View container,
final ViewRetriever inFragment, final View nonExistentView,
EpicenterView epicenterView, final Map<String, String> nameOverrides,
final ArrayList<View> enteringViews, final Map<String, View> renamedViews,
final ArrayList<View> sharedElementTargets) {
if (enterTransitionObject != null || sharedElementTransitionObject != null) {
final Transition enterTransition = (Transition) enterTransitionObject;
if (enterTransition != null) {
enterTransition.addTarget(nonExistentView);
}
if (sharedElementTransitionObject != null) {
Transition sharedElementTransition = (Transition) sharedElementTransitionObject;
addTargets(sharedElementTransition, sharedElementTargets);
}
if (inFragment != null) {
container.getViewTreeObserver().addOnPreDrawListener(
new ViewTreeObserver.OnPreDrawListener() {
public boolean onPreDraw() {
container.getViewTreeObserver().removeOnPreDrawListener(this);
View fragmentView = inFragment.getView();
if (fragmentView != null) {
if (!nameOverrides.isEmpty()) {
findNamedViews(renamedViews, fragmentView);
renamedViews.keySet().retainAll(nameOverrides.values());
for (Map.Entry<String, String> entry : nameOverrides.entrySet()) {
String to = entry.getValue();
View view = renamedViews.get(to);
if (view != null) {
String from = entry.getKey();
view.setTransitionName(from);
}
}
}
if (enterTransition != null) {
captureTransitioningViews(enteringViews, fragmentView);
enteringViews.removeAll(renamedViews.values());
addTargets(enterTransition, enteringViews);
}
}
return true;
}
});
}
setSharedElementEpicenter(enterTransition, epicenterView);
}
}
public static Object mergeTransitions(Object enterTransitionObject,
Object exitTransitionObject, Object sharedElementTransitionObject,
boolean allowOverlap) {
boolean overlap = true;
Transition enterTransition = (Transition) enterTransitionObject;
Transition exitTransition = (Transition) exitTransitionObject;
Transition sharedElementTransition = (Transition) sharedElementTransitionObject;
if (enterTransition != null && exitTransition != null) {
overlap = allowOverlap;
}
// Wrap the transitions. Explicit targets like in enter and exit will cause the
// views to be targeted regardless of excluded views. If that happens, then the
// excluded fragments views (hidden fragments) will still be in the transition.
Transition transition;
if (overlap) {
// Regular transition -- do it all together
TransitionSet transitionSet = new TransitionSet();
if (enterTransition != null) {
transitionSet.addTransition(enterTransition);
}
if (exitTransition != null) {
transitionSet.addTransition(exitTransition);
}
if (sharedElementTransition != null) {
transitionSet.addTransition(sharedElementTransition);
}
transition = transitionSet;
} else {
// First do exit, then enter, but allow shared element transition to happen
// during both.
Transition staggered = null;
if (exitTransition != null && enterTransition != null) {
staggered = new TransitionSet()
.addTransition(exitTransition)
.addTransition(enterTransition)
.setOrdering(TransitionSet.ORDERING_SEQUENTIAL);
} else if (exitTransition != null) {
staggered = exitTransition;
} else if (enterTransition != null) {
staggered = enterTransition;
}
if (sharedElementTransition != null) {
TransitionSet together = new TransitionSet();
if (staggered != null) {
together.addTransition(staggered);
}
together.addTransition(sharedElementTransition);
transition = together;
} else {
transition = staggered;
}
}
return transition;
}
private static void setSharedElementEpicenter(Transition transition,
final EpicenterView epicenterView) {
if (transition != null) {
transition.setEpicenterCallback(new Transition.EpicenterCallback() {
private Rect mEpicenter;
@Override
public Rect onGetEpicenter(Transition transition) {
if (mEpicenter == null && epicenterView.epicenter != null) {
mEpicenter = getBoundsOnScreen(epicenterView.epicenter);
}
return mEpicenter;
}
});
}
}
private static Rect getBoundsOnScreen(View view) {
Rect epicenter = new Rect();
int[] loc = new int[2];
view.getLocationOnScreen(loc);
// not as good as View.getBoundsOnScreen, but that's not public
epicenter.set(loc[0], loc[1], loc[0] + view.getWidth(), loc[1] + view.getHeight());
return epicenter;
}
private static void captureTransitioningViews(ArrayList<View> transitioningViews, View view) {
if (view.getVisibility() == View.VISIBLE) {
if (view instanceof ViewGroup) {
ViewGroup viewGroup = (ViewGroup) view;
if (viewGroup.isTransitionGroup()) {
transitioningViews.add(viewGroup);
} else {
int count = viewGroup.getChildCount();
for (int i = 0; i < count; i++) {
View child = viewGroup.getChildAt(i);
captureTransitioningViews(transitioningViews, child);
}
}
} else {
transitioningViews.add(view);
}
}
}
public static void findNamedViews(Map<String, View> namedViews, View view) {
if (view.getVisibility() == View.VISIBLE) {
String transitionName = view.getTransitionName();
if (transitionName != null) {
namedViews.put(transitionName, view);
}
if (view instanceof ViewGroup) {
ViewGroup viewGroup = (ViewGroup) view;
int count = viewGroup.getChildCount();
for (int i = 0; i < count; i++) {
View child = viewGroup.getChildAt(i);
findNamedViews(namedViews, child);
}
}
}
}
public static void cleanupTransitions(final View sceneRoot, final View nonExistentView,
Object enterTransitionObject, final ArrayList<View> enteringViews,
Object exitTransitionObject, final ArrayList<View> exitingViews,
Object sharedElementTransitionObject, final ArrayList<View> sharedElementTargets,
Object overallTransitionObject, final ArrayList<View> hiddenViews,
final Map<String, View> renamedViews) {
final Transition enterTransition = (Transition) enterTransitionObject;
final Transition exitTransition = (Transition) exitTransitionObject;
final Transition sharedElementTransition = (Transition) sharedElementTransitionObject;
final Transition overallTransition = (Transition) overallTransitionObject;
if (overallTransition != null) {
sceneRoot.getViewTreeObserver().addOnPreDrawListener(
new ViewTreeObserver.OnPreDrawListener() {
public boolean onPreDraw() {
sceneRoot.getViewTreeObserver().removeOnPreDrawListener(this);
if (enterTransition != null) {
enterTransition.removeTarget(nonExistentView);
removeTargets(enterTransition, enteringViews);
}
if (exitTransition != null) {
removeTargets(exitTransition, exitingViews);
}
if (sharedElementTransition != null) {
removeTargets(sharedElementTransition, sharedElementTargets);
}
for (Map.Entry<String, View> entry : renamedViews.entrySet()) {
View view = entry.getValue();
String name = entry.getKey();
view.setTransitionName(name);
}
int numViews = hiddenViews.size();
for (int i = 0; i < numViews; i++) {
overallTransition.excludeTarget(hiddenViews.get(i), false);
}
overallTransition.excludeTarget(nonExistentView, false);
return true;
}
});
}
}
public static void removeTargets(Object transitionObject, ArrayList<View> views) {
Transition transition = (Transition) transitionObject;
int numViews = views.size();
for (int i = 0; i < numViews; i++) {
transition.removeTarget(views.get(i));
}
}
public static void addTargets(Object transitionObject, ArrayList<View> views) {
Transition transition = (Transition) transitionObject;
int numViews = views.size();
for (int i = 0; i < numViews; i++) {
transition.addTarget(views.get(i));
}
}
public interface ViewRetriever {
View getView();
}
public static class EpicenterView {
public View epicenter;
}
}