Java tutorial
/* * 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.animation.Animator; import android.animation.AnimatorListenerAdapter; import android.animation.TimeInterpolator; import android.support.annotation.RestrictTo; import android.support.v4.util.ArrayMap; import android.support.v4.util.LongSparseArray; import android.util.Log; import android.util.SparseArray; import android.view.View; import android.view.ViewGroup; import android.widget.ListView; import java.util.ArrayList; import java.util.List; import static android.support.annotation.RestrictTo.Scope.GROUP_ID; abstract class TransitionPort implements Cloneable { static final boolean DBG = false; private static final String LOG_TAG = "Transition"; // Per-animator information used for later canceling when future transitions overlap private static ThreadLocal<ArrayMap<Animator, AnimationInfo>> sRunningAnimators = new ThreadLocal<>(); long mStartDelay = -1; long mDuration = -1; TimeInterpolator mInterpolator = null; ArrayList<Integer> mTargetIds = new ArrayList<>(); ArrayList<View> mTargets = new ArrayList<>(); ArrayList<Integer> mTargetIdExcludes = null; ArrayList<View> mTargetExcludes = null; ArrayList<Class> mTargetTypeExcludes = null; ArrayList<Integer> mTargetIdChildExcludes = null; ArrayList<View> mTargetChildExcludes = null; ArrayList<Class> mTargetTypeChildExcludes = null; TransitionSetPort mParent = null; // Scene Root is set at createAnimator() time in the cloned Transition ViewGroup mSceneRoot = null; // Whether removing views from their parent is possible. This is only for views // in the start scene, which are no longer in the view hierarchy. This property // is determined by whether the previous Scene was created from a layout // resource, and thus the views from the exited scene are going away anyway // and can be removed as necessary to achieve a particular effect, such as // removing them from parents to add them to overlays. boolean mCanRemoveViews = false; // Number of per-target instances of this Transition currently running. This count is // determined by calls to start() and end() int mNumInstances = 0; // Whether this transition is currently paused, due to a call to pause() boolean mPaused = false; // The set of listeners to be sent transition lifecycle events. ArrayList<TransitionListener> mListeners = null; // The set of animators collected from calls to createAnimator(), // to be run in runAnimators() ArrayList<Animator> mAnimators = new ArrayList<>(); private String mName = getClass().getName(); private android.support.transition.TransitionValuesMaps mStartValues = new android.support.transition.TransitionValuesMaps(); private android.support.transition.TransitionValuesMaps mEndValues = new android.support.transition.TransitionValuesMaps(); // Track all animators in use in case the transition gets canceled and needs to // cancel running animators ArrayList<Animator> mCurrentAnimators = new ArrayList<>(); // Whether this transition has ended. Used to avoid pause/resume on transitions // that have completed private boolean mEnded = false; /** * Constructs a Transition object with no target objects. A transition with * no targets defaults to running on all target objects in the scene hierarchy * (if the transition is not contained in a TransitionSet), or all target * objects passed down from its parent (if it is in a TransitionSet). */ public TransitionPort() { } private static ArrayMap<Animator, AnimationInfo> getRunningAnimators() { ArrayMap<Animator, AnimationInfo> runningAnimators = sRunningAnimators.get(); if (runningAnimators == null) { runningAnimators = new ArrayMap<>(); sRunningAnimators.set(runningAnimators); } return runningAnimators; } public long getDuration() { return mDuration; } public TransitionPort setDuration(long duration) { mDuration = duration; return this; } public long getStartDelay() { return mStartDelay; } public TransitionPort setStartDelay(long startDelay) { mStartDelay = startDelay; return this; } public TimeInterpolator getInterpolator() { return mInterpolator; } public TransitionPort setInterpolator(TimeInterpolator interpolator) { mInterpolator = interpolator; return this; } public String[] getTransitionProperties() { return null; } public Animator createAnimator(ViewGroup sceneRoot, TransitionValues startValues, TransitionValues endValues) { return null; } /** * This method, essentially a wrapper around all calls to createAnimator for all * possible target views, is called with the entire set of start/end * values. The implementation in Transition iterates through these lists * and calls {@link #createAnimator(ViewGroup, TransitionValues, TransitionValues)} * with each set of start/end values on this transition. The * TransitionSet subclass overrides this method and delegates it to * each of its children in succession. * * @hide */ @RestrictTo(GROUP_ID) protected void createAnimators(ViewGroup sceneRoot, TransitionValuesMaps startValues, TransitionValuesMaps endValues) { if (DBG) { Log.d(LOG_TAG, "createAnimators() for " + this); } ArrayMap<View, TransitionValues> endCopy = new ArrayMap<>(endValues.viewValues); SparseArray<TransitionValues> endIdCopy = new SparseArray<>(endValues.idValues.size()); for (int i = 0; i < endValues.idValues.size(); ++i) { int id = endValues.idValues.keyAt(i); endIdCopy.put(id, endValues.idValues.valueAt(i)); } LongSparseArray<TransitionValues> endItemIdCopy = new LongSparseArray<>(endValues.itemIdValues.size()); for (int i = 0; i < endValues.itemIdValues.size(); ++i) { long id = endValues.itemIdValues.keyAt(i); endItemIdCopy.put(id, endValues.itemIdValues.valueAt(i)); } // Walk through the start values, playing everything we find // Remove from the end set as we go ArrayList<TransitionValues> startValuesList = new ArrayList<>(); ArrayList<TransitionValues> endValuesList = new ArrayList<>(); for (View view : startValues.viewValues.keySet()) { TransitionValues start; TransitionValues end = null; boolean isInListView = false; if (view.getParent() instanceof ListView) { isInListView = true; } if (!isInListView) { int id = view.getId(); start = startValues.viewValues.get(view) != null ? startValues.viewValues.get(view) : startValues.idValues.get(id); if (endValues.viewValues.get(view) != null) { end = endValues.viewValues.get(view); endCopy.remove(view); } else if (id != View.NO_ID) { end = endValues.idValues.get(id); View removeView = null; for (View viewToRemove : endCopy.keySet()) { if (viewToRemove.getId() == id) { removeView = viewToRemove; } } if (removeView != null) { endCopy.remove(removeView); } } endIdCopy.remove(id); if (isValidTarget(view, id)) { startValuesList.add(start); endValuesList.add(end); } } else { ListView parent = (ListView) view.getParent(); if (parent.getAdapter().hasStableIds()) { int position = parent.getPositionForView(view); long itemId = parent.getItemIdAtPosition(position); start = startValues.itemIdValues.get(itemId); endItemIdCopy.remove(itemId); // TODO: deal with targetIDs for itemIDs for ListView items startValuesList.add(start); endValuesList.add(end); } } } int startItemIdCopySize = startValues.itemIdValues.size(); for (int i = 0; i < startItemIdCopySize; ++i) { long id = startValues.itemIdValues.keyAt(i); if (isValidTarget(null, id)) { TransitionValues start = startValues.itemIdValues.get(id); TransitionValues end = endValues.itemIdValues.get(id); endItemIdCopy.remove(id); startValuesList.add(start); endValuesList.add(end); } } // Now walk through the remains of the end set for (View view : endCopy.keySet()) { int id = view.getId(); if (isValidTarget(view, id)) { TransitionValues start = startValues.viewValues.get(view) != null ? startValues.viewValues.get(view) : startValues.idValues.get(id); TransitionValues end = endCopy.get(view); endIdCopy.remove(id); startValuesList.add(start); endValuesList.add(end); } } int endIdCopySize = endIdCopy.size(); for (int i = 0; i < endIdCopySize; ++i) { int id = endIdCopy.keyAt(i); if (isValidTarget(null, id)) { TransitionValues start = startValues.idValues.get(id); TransitionValues end = endIdCopy.get(id); startValuesList.add(start); endValuesList.add(end); } } int endItemIdCopySize = endItemIdCopy.size(); for (int i = 0; i < endItemIdCopySize; ++i) { long id = endItemIdCopy.keyAt(i); // TODO: Deal with targetIDs and itemIDs TransitionValues start = startValues.itemIdValues.get(id); TransitionValues end = endItemIdCopy.get(id); startValuesList.add(start); endValuesList.add(end); } ArrayMap<Animator, AnimationInfo> runningAnimators = getRunningAnimators(); for (int i = 0; i < startValuesList.size(); ++i) { TransitionValues start = startValuesList.get(i); TransitionValues end = endValuesList.get(i); // Only bother trying to animate with values that differ between start/end if (start != null || end != null) { if (start == null || !start.equals(end)) { if (DBG) { View view = (end != null) ? end.view : start.view; Log.d(LOG_TAG, " differing start/end values for view " + view); if (start == null || end == null) { Log.d(LOG_TAG, " " + ((start == null) ? "start null, end non-null" : "start non-null, end null")); } else { for (String key : start.values.keySet()) { Object startValue = start.values.get(key); Object endValue = end.values.get(key); if (startValue != endValue && !startValue.equals(endValue)) { Log.d(LOG_TAG, " " + key + ": start(" + startValue + "), end(" + endValue + ")"); } } } } // TODO: what to do about targetIds and itemIds? Animator animator = createAnimator(sceneRoot, start, end); if (animator != null) { // Save animation info for future cancellation purposes View view; TransitionValues infoValues = null; if (end != null) { view = end.view; String[] properties = getTransitionProperties(); if (view != null && properties != null && properties.length > 0) { infoValues = new TransitionValues(); infoValues.view = view; TransitionValues newValues = endValues.viewValues.get(view); if (newValues != null) { for (int j = 0; j < properties.length; ++j) { infoValues.values.put(properties[j], newValues.values.get(properties[j])); } } int numExistingAnims = runningAnimators.size(); for (int j = 0; j < numExistingAnims; ++j) { Animator anim = runningAnimators.keyAt(j); AnimationInfo info = runningAnimators.get(anim); if (info.values != null && info.view == view && ((info.name == null && getName() == null) || info.name.equals(getName()))) { if (info.values.equals(infoValues)) { // Favor the old animator animator = null; break; } } } } } else { view = start.view; } if (animator != null) { AnimationInfo info = new AnimationInfo(view, getName(), WindowIdPort.getWindowId(sceneRoot), infoValues); runningAnimators.put(animator, info); mAnimators.add(animator); } } } } } } /** * Internal utility method for checking whether a given view/id * is valid for this transition, where "valid" means that either * the Transition has no target/targetId list (the default, in which * cause the transition should act on all views in the hiearchy), or * the given view is in the target list or the view id is in the * targetId list. If the target parameter is null, then the target list * is not checked (this is in the case of ListView items, where the * views are ignored and only the ids are used). */ boolean isValidTarget(View target, long targetId) { if (mTargetIdExcludes != null && mTargetIdExcludes.contains((int) targetId)) { return false; } if (mTargetExcludes != null && mTargetExcludes.contains(target)) { return false; } if (mTargetTypeExcludes != null && target != null) { int numTypes = mTargetTypeExcludes.size(); for (int i = 0; i < numTypes; ++i) { Class type = mTargetTypeExcludes.get(i); if (type.isInstance(target)) { return false; } } } if (mTargetIds.size() == 0 && mTargets.size() == 0) { return true; } if (mTargetIds.size() > 0) { for (int i = 0; i < mTargetIds.size(); ++i) { if (mTargetIds.get(i) == targetId) { return true; } } } if (target != null && mTargets.size() > 0) { for (int i = 0; i < mTargets.size(); ++i) { if (mTargets.get(i) == target) { return true; } } } return false; } /** * This is called internally once all animations have been set up by the * transition hierarchy. \ * * @hide */ @RestrictTo(GROUP_ID) protected void runAnimators() { if (DBG) { Log.d(LOG_TAG, "runAnimators() on " + this); } start(); ArrayMap<Animator, AnimationInfo> runningAnimators = getRunningAnimators(); // Now start every Animator that was previously created for this transition for (Animator anim : mAnimators) { if (DBG) { Log.d(LOG_TAG, " anim: " + anim); } if (runningAnimators.containsKey(anim)) { start(); runAnimator(anim, runningAnimators); } } mAnimators.clear(); end(); } private void runAnimator(Animator animator, final ArrayMap<Animator, AnimationInfo> runningAnimators) { if (animator != null) { // TODO: could be a single listener instance for all of them since it uses the param animator.addListener(new AnimatorListenerAdapter() { @Override public void onAnimationStart(Animator animation) { mCurrentAnimators.add(animation); } @Override public void onAnimationEnd(Animator animation) { runningAnimators.remove(animation); mCurrentAnimators.remove(animation); } }); animate(animator); } } public abstract void captureStartValues(TransitionValues transitionValues); public abstract void captureEndValues(TransitionValues transitionValues); public TransitionPort addTarget(int targetId) { if (targetId > 0) { mTargetIds.add(targetId); } return this; } public TransitionPort removeTarget(int targetId) { if (targetId > 0) { mTargetIds.remove((Integer) targetId); } return this; } public TransitionPort excludeTarget(int targetId, boolean exclude) { mTargetIdExcludes = excludeId(mTargetIdExcludes, targetId, exclude); return this; } public TransitionPort excludeChildren(int targetId, boolean exclude) { mTargetIdChildExcludes = excludeId(mTargetIdChildExcludes, targetId, exclude); return this; } /** * Utility method to manage the boilerplate code that is the same whether we * are excluding targets or their children. */ private ArrayList<Integer> excludeId(ArrayList<Integer> list, int targetId, boolean exclude) { if (targetId > 0) { if (exclude) { list = ArrayListManager.add(list, targetId); } else { list = ArrayListManager.remove(list, targetId); } } return list; } public TransitionPort excludeTarget(View target, boolean exclude) { mTargetExcludes = excludeView(mTargetExcludes, target, exclude); return this; } public TransitionPort excludeChildren(View target, boolean exclude) { mTargetChildExcludes = excludeView(mTargetChildExcludes, target, exclude); return this; } /** * Utility method to manage the boilerplate code that is the same whether we * are excluding targets or their children. */ private ArrayList<View> excludeView(ArrayList<View> list, View target, boolean exclude) { if (target != null) { if (exclude) { list = ArrayListManager.add(list, target); } else { list = ArrayListManager.remove(list, target); } } return list; } public TransitionPort excludeTarget(Class type, boolean exclude) { mTargetTypeExcludes = excludeType(mTargetTypeExcludes, type, exclude); return this; } public TransitionPort excludeChildren(Class type, boolean exclude) { mTargetTypeChildExcludes = excludeType(mTargetTypeChildExcludes, type, exclude); return this; } /** * Utility method to manage the boilerplate code that is the same whether we * are excluding targets or their children. */ private ArrayList<Class> excludeType(ArrayList<Class> list, Class type, boolean exclude) { if (type != null) { if (exclude) { list = ArrayListManager.add(list, type); } else { list = ArrayListManager.remove(list, type); } } return list; } /** * Sets the target view instances that this Transition is interested in * animating. By default, there are no targets, and a Transition will * listen for changes on every view in the hierarchy below the sceneRoot * of the Scene being transitioned into. Setting targets constrains * the Transition to only listen for, and act on, these views. * All other views will be ignored. * * <p>The target list is like the {@link #addTarget(int) targetId} * list except this list specifies the actual View instances, not the ids * of the views. This is an important distinction when scene changes involve * view hierarchies which have been inflated separately; different views may * share the same id but not actually be the same instance. If the transition * should treat those views as the same, then {@link #addTarget(int)} should be used * instead of {@link #addTarget(View)}. If, on the other hand, scene changes involve * changes all within the same view hierarchy, among views which do not * necessarily have ids set on them, then the target list of views may be more * convenient.</p> * * @param target A View on which the Transition will act, must be non-null. * @return The Transition to which the target is added. * Returning the same object makes it easier to chain calls during * construction, such as * <code>transitionSet.addTransitions(new Fade()).addTarget(someView);</code> * @see #addTarget(int) */ public TransitionPort addTarget(View target) { mTargets.add(target); return this; } public TransitionPort removeTarget(View target) { if (target != null) { mTargets.remove(target); } return this; } public List<Integer> getTargetIds() { return mTargetIds; } public List<View> getTargets() { return mTargets; } /** * Recursive method that captures values for the given view and the * hierarchy underneath it. * * @param sceneRoot The root of the view hierarchy being captured * @param start true if this capture is happening before the scene change, * false otherwise */ void captureValues(ViewGroup sceneRoot, boolean start) { clearValues(start); if (mTargetIds.size() > 0 || mTargets.size() > 0) { if (mTargetIds.size() > 0) { for (int i = 0; i < mTargetIds.size(); ++i) { int id = mTargetIds.get(i); View view = sceneRoot.findViewById(id); if (view != null) { TransitionValues values = new TransitionValues(); values.view = view; if (start) { captureStartValues(values); } else { captureEndValues(values); } if (start) { mStartValues.viewValues.put(view, values); if (id >= 0) { mStartValues.idValues.put(id, values); } } else { mEndValues.viewValues.put(view, values); if (id >= 0) { mEndValues.idValues.put(id, values); } } } } } if (mTargets.size() > 0) { for (int i = 0; i < mTargets.size(); ++i) { View view = mTargets.get(i); if (view != null) { TransitionValues values = new TransitionValues(); values.view = view; if (start) { captureStartValues(values); } else { captureEndValues(values); } if (start) { mStartValues.viewValues.put(view, values); } else { mEndValues.viewValues.put(view, values); } } } } } else { captureHierarchy(sceneRoot, start); } } /** * Clear valuesMaps for specified start/end state * * @param start true if the start values should be cleared, false otherwise */ void clearValues(boolean start) { if (start) { mStartValues.viewValues.clear(); mStartValues.idValues.clear(); mStartValues.itemIdValues.clear(); } else { mEndValues.viewValues.clear(); mEndValues.idValues.clear(); mEndValues.itemIdValues.clear(); } } /** * Recursive method which captures values for an entire view hierarchy, * starting at some root view. Transitions without targetIDs will use this * method to capture values for all possible views. * * @param view The view for which to capture values. Children of this View * will also be captured, recursively down to the leaf nodes. * @param start true if values are being captured in the start scene, false * otherwise. */ private void captureHierarchy(View view, boolean start) { if (view == null) { return; } boolean isListViewItem = false; if (view.getParent() instanceof ListView) { isListViewItem = true; } if (isListViewItem && !((ListView) view.getParent()).getAdapter().hasStableIds()) { // ignore listview children unless we can track them with stable IDs return; } int id = View.NO_ID; long itemId = View.NO_ID; if (!isListViewItem) { id = view.getId(); } else { ListView listview = (ListView) view.getParent(); int position = listview.getPositionForView(view); itemId = listview.getItemIdAtPosition(position); // view.setHasTransientState(true); } if (mTargetIdExcludes != null && mTargetIdExcludes.contains(id)) { return; } if (mTargetExcludes != null && mTargetExcludes.contains(view)) { return; } if (mTargetTypeExcludes != null && view != null) { int numTypes = mTargetTypeExcludes.size(); for (int i = 0; i < numTypes; ++i) { if (mTargetTypeExcludes.get(i).isInstance(view)) { return; } } } TransitionValues values = new TransitionValues(); values.view = view; if (start) { captureStartValues(values); } else { captureEndValues(values); } if (start) { if (!isListViewItem) { mStartValues.viewValues.put(view, values); if (id >= 0) { mStartValues.idValues.put((int) id, values); } } else { mStartValues.itemIdValues.put(itemId, values); } } else { if (!isListViewItem) { mEndValues.viewValues.put(view, values); if (id >= 0) { mEndValues.idValues.put((int) id, values); } } else { mEndValues.itemIdValues.put(itemId, values); } } if (view instanceof ViewGroup) { // Don't traverse child hierarchy if there are any child-excludes on this view if (mTargetIdChildExcludes != null && mTargetIdChildExcludes.contains(id)) { return; } if (mTargetChildExcludes != null && mTargetChildExcludes.contains(view)) { return; } if (mTargetTypeChildExcludes != null && view != null) { int numTypes = mTargetTypeChildExcludes.size(); for (int i = 0; i < numTypes; ++i) { if (mTargetTypeChildExcludes.get(i).isInstance(view)) { return; } } } ViewGroup parent = (ViewGroup) view; for (int i = 0; i < parent.getChildCount(); ++i) { captureHierarchy(parent.getChildAt(i), start); } } } public TransitionValues getTransitionValues(View view, boolean start) { if (mParent != null) { return mParent.getTransitionValues(view, start); } TransitionValuesMaps valuesMaps = start ? mStartValues : mEndValues; TransitionValues values = valuesMaps.viewValues.get(view); if (values == null) { int id = view.getId(); if (id >= 0) { values = valuesMaps.idValues.get(id); } if (values == null && view.getParent() instanceof ListView) { ListView listview = (ListView) view.getParent(); int position = listview.getPositionForView(view); long itemId = listview.getItemIdAtPosition(position); values = valuesMaps.itemIdValues.get(itemId); } // TODO: Doesn't handle the case where a view was parented to a // ListView (with an itemId), but no longer is } return values; } /** * Pauses this transition, sending out calls to {@link * TransitionListener#onTransitionPause(TransitionPort)} to all listeners * and pausing all running animators started by this transition. * * @hide */ @RestrictTo(GROUP_ID) public void pause(View sceneRoot) { if (!mEnded) { ArrayMap<Animator, AnimationInfo> runningAnimators = getRunningAnimators(); int numOldAnims = runningAnimators.size(); WindowIdPort windowId = WindowIdPort.getWindowId(sceneRoot); for (int i = numOldAnims - 1; i >= 0; i--) { AnimationInfo info = runningAnimators.valueAt(i); if (info.view != null && windowId.equals(info.windowId)) { Animator anim = runningAnimators.keyAt(i); anim.cancel(); // pause() is API Level 19 } } if (mListeners != null && mListeners.size() > 0) { ArrayList<TransitionListener> tmpListeners = (ArrayList<TransitionListener>) mListeners.clone(); int numListeners = tmpListeners.size(); for (int i = 0; i < numListeners; ++i) { tmpListeners.get(i).onTransitionPause(this); } } mPaused = true; } } /** * Resumes this transition, sending out calls to {@link * TransitionListener#onTransitionPause(TransitionPort)} to all listeners * and pausing all running animators started by this transition. * * @hide */ @RestrictTo(GROUP_ID) public void resume(View sceneRoot) { if (mPaused) { if (!mEnded) { ArrayMap<Animator, AnimationInfo> runningAnimators = getRunningAnimators(); int numOldAnims = runningAnimators.size(); WindowIdPort windowId = WindowIdPort.getWindowId(sceneRoot); for (int i = numOldAnims - 1; i >= 0; i--) { AnimationInfo info = runningAnimators.valueAt(i); if (info.view != null && windowId.equals(info.windowId)) { Animator anim = runningAnimators.keyAt(i); anim.end(); // resume() is API Level 19 } } if (mListeners != null && mListeners.size() > 0) { ArrayList<TransitionListener> tmpListeners = (ArrayList<TransitionListener>) mListeners.clone(); int numListeners = tmpListeners.size(); for (int i = 0; i < numListeners; ++i) { tmpListeners.get(i).onTransitionResume(this); } } } mPaused = false; } } /** * Called by TransitionManager to play the transition. This calls * createAnimators() to set things up and create all of the animations and then * runAnimations() to actually start the animations. */ void playTransition(ViewGroup sceneRoot) { ArrayMap<Animator, AnimationInfo> runningAnimators = getRunningAnimators(); int numOldAnims = runningAnimators.size(); for (int i = numOldAnims - 1; i >= 0; i--) { Animator anim = runningAnimators.keyAt(i); if (anim != null) { AnimationInfo oldInfo = runningAnimators.get(anim); if (oldInfo != null && oldInfo.view != null && oldInfo.view.getContext() == sceneRoot.getContext()) { boolean cancel = false; TransitionValues oldValues = oldInfo.values; View oldView = oldInfo.view; TransitionValues newValues = mEndValues.viewValues != null ? mEndValues.viewValues.get(oldView) : null; if (newValues == null) { newValues = mEndValues.idValues.get(oldView.getId()); } if (oldValues != null) { // if oldValues null, then transition didn't care to stash values, // and won't get canceled if (newValues != null) { for (String key : oldValues.values.keySet()) { Object oldValue = oldValues.values.get(key); Object newValue = newValues.values.get(key); if (oldValue != null && newValue != null && !oldValue.equals(newValue)) { cancel = true; if (DBG) { Log.d(LOG_TAG, "Transition.playTransition: " + "oldValue != newValue for " + key + ": old, new = " + oldValue + ", " + newValue); } break; } } } } if (cancel) { if (anim.isRunning() || anim.isStarted()) { if (DBG) { Log.d(LOG_TAG, "Canceling anim " + anim); } anim.cancel(); } else { if (DBG) { Log.d(LOG_TAG, "removing anim from info list: " + anim); } runningAnimators.remove(anim); } } } } } createAnimators(sceneRoot, mStartValues, mEndValues); runAnimators(); } /** * This is a utility method used by subclasses to handle standard parts of * setting up and running an Animator: it sets the {@link #getDuration() * duration} and the {@link #getStartDelay() startDelay}, starts the * animation, and, when the animator ends, calls {@link #end()}. * * @param animator The Animator to be run during this transition. * @hide */ @RestrictTo(GROUP_ID) protected void animate(Animator animator) { // TODO: maybe pass auto-end as a boolean parameter? if (animator == null) { end(); } else { if (getDuration() >= 0) { animator.setDuration(getDuration()); } if (getStartDelay() >= 0) { animator.setStartDelay(getStartDelay()); } if (getInterpolator() != null) { animator.setInterpolator(getInterpolator()); } animator.addListener(new AnimatorListenerAdapter() { @Override public void onAnimationEnd(Animator animation) { end(); animation.removeListener(this); } }); animator.start(); } } /** * This method is called automatically by the transition and * TransitionSet classes prior to a Transition subclass starting; * subclasses should not need to call it directly. * * @hide */ @RestrictTo(GROUP_ID) protected void start() { if (mNumInstances == 0) { if (mListeners != null && mListeners.size() > 0) { ArrayList<TransitionListener> tmpListeners = (ArrayList<TransitionListener>) mListeners.clone(); int numListeners = tmpListeners.size(); for (int i = 0; i < numListeners; ++i) { tmpListeners.get(i).onTransitionStart(this); } } mEnded = false; } mNumInstances++; } /** * This method is called automatically by the Transition and * TransitionSet classes when a transition finishes, either because * a transition did nothing (returned a null Animator from * {@link TransitionPort#createAnimator(ViewGroup, TransitionValues, * TransitionValues)}) or because the transition returned a valid * Animator and end() was called in the onAnimationEnd() * callback of the AnimatorListener. * * @hide */ @RestrictTo(GROUP_ID) protected void end() { --mNumInstances; if (mNumInstances == 0) { if (mListeners != null && mListeners.size() > 0) { ArrayList<TransitionListener> tmpListeners = (ArrayList<TransitionListener>) mListeners.clone(); int numListeners = tmpListeners.size(); for (int i = 0; i < numListeners; ++i) { tmpListeners.get(i).onTransitionEnd(this); } } for (int i = 0; i < mStartValues.itemIdValues.size(); ++i) { TransitionValues tv = mStartValues.itemIdValues.valueAt(i); View v = tv.view; // if (v.hasTransientState()) { // v.setHasTransientState(false); // } } for (int i = 0; i < mEndValues.itemIdValues.size(); ++i) { TransitionValues tv = mEndValues.itemIdValues.valueAt(i); View v = tv.view; // if (v.hasTransientState()) { // v.setHasTransientState(false); // } } mEnded = true; } } /** * This method cancels a transition that is currently running. * * @hide */ @RestrictTo(GROUP_ID) protected void cancel() { int numAnimators = mCurrentAnimators.size(); for (int i = numAnimators - 1; i >= 0; i--) { Animator animator = mCurrentAnimators.get(i); animator.cancel(); } if (mListeners != null && mListeners.size() > 0) { ArrayList<TransitionListener> tmpListeners = (ArrayList<TransitionListener>) mListeners.clone(); int numListeners = tmpListeners.size(); for (int i = 0; i < numListeners; ++i) { tmpListeners.get(i).onTransitionCancel(this); } } } /** * Adds a listener to the set of listeners that are sent events through the * life of an animation, such as start, repeat, and end. * * @param listener the listener to be added to the current set of listeners * for this animation. * @return This transition object. */ public TransitionPort addListener(TransitionListener listener) { if (mListeners == null) { mListeners = new ArrayList<>(); } mListeners.add(listener); return this; } public TransitionPort removeListener(TransitionListener listener) { if (mListeners == null) { return this; } mListeners.remove(listener); if (mListeners.size() == 0) { mListeners = null; } return this; } TransitionPort setSceneRoot(ViewGroup sceneRoot) { mSceneRoot = sceneRoot; return this; } void setCanRemoveViews(boolean canRemoveViews) { mCanRemoveViews = canRemoveViews; } @Override public String toString() { return toString(""); } @Override public TransitionPort clone() { TransitionPort clone = null; try { clone = (TransitionPort) super.clone(); clone.mAnimators = new ArrayList<Animator>(); clone.mStartValues = new TransitionValuesMaps(); clone.mEndValues = new TransitionValuesMaps(); } catch (CloneNotSupportedException e) { } return clone; } public String getName() { return mName; } String toString(String indent) { String result = indent + getClass().getSimpleName() + "@" + Integer.toHexString(hashCode()) + ": "; if (mDuration != -1) { result += "dur(" + mDuration + ") "; } if (mStartDelay != -1) { result += "dly(" + mStartDelay + ") "; } if (mInterpolator != null) { result += "interp(" + mInterpolator + ") "; } if (mTargetIds.size() > 0 || mTargets.size() > 0) { result += "tgts("; if (mTargetIds.size() > 0) { for (int i = 0; i < mTargetIds.size(); ++i) { if (i > 0) { result += ", "; } result += mTargetIds.get(i); } } if (mTargets.size() > 0) { for (int i = 0; i < mTargets.size(); ++i) { if (i > 0) { result += ", "; } result += mTargets.get(i); } } result += ")"; } return result; } public interface TransitionListener { /** * Notification about the start of the transition. * * @param transition The started transition. */ void onTransitionStart(TransitionPort transition); /** * Notification about the end of the transition. Canceled transitions * will always notify listeners of both the cancellation and end * events. That is, {@link #onTransitionEnd(TransitionPort)} is always called, * regardless of whether the transition was canceled or played * through to completion. * * @param transition The transition which reached its end. */ void onTransitionEnd(TransitionPort transition); /** * Notification about the cancellation of the transition. * Note that cancel may be called by a parent {@link TransitionSetPort} on * a child transition which has not yet started. This allows the child * transition to restore state on target objects which was set at * {@link #createAnimator(ViewGroup, TransitionValues, TransitionValues) * createAnimator()} time. * * @param transition The transition which was canceled. */ void onTransitionCancel(TransitionPort transition); /** * Notification when a transition is paused. * Note that createAnimator() may be called by a parent {@link TransitionSetPort} on * a child transition which has not yet started. This allows the child * transition to restore state on target objects which was set at * {@link #createAnimator(ViewGroup, TransitionValues, TransitionValues) * createAnimator()} time. * * @param transition The transition which was paused. */ void onTransitionPause(TransitionPort transition); /** * Notification when a transition is resumed. * Note that resume() may be called by a parent {@link TransitionSetPort} on * a child transition which has not yet started. This allows the child * transition to restore state which may have changed in an earlier call * to {@link #onTransitionPause(TransitionPort)}. * * @param transition The transition which was resumed. */ void onTransitionResume(TransitionPort transition); } /** * Utility adapter class to avoid having to override all three methods * whenever someone just wants to listen for a single event. * * @hide */ @RestrictTo(GROUP_ID) public static class TransitionListenerAdapter implements TransitionListener { @Override public void onTransitionStart(TransitionPort transition) { } @Override public void onTransitionEnd(TransitionPort transition) { } @Override public void onTransitionCancel(TransitionPort transition) { } @Override public void onTransitionPause(TransitionPort transition) { } @Override public void onTransitionResume(TransitionPort transition) { } } /** * Holds information about each animator used when a new transition starts * while other transitions are still running to determine whether a running * animation should be canceled or a new animation noop'd. The structure holds * information about the state that an animation is going to, to be compared to * end state of a new animation. */ private static class AnimationInfo { View view; String name; TransitionValues values; WindowIdPort windowId; AnimationInfo(View view, String name, WindowIdPort windowId, TransitionValues values) { this.view = view; this.name = name; this.values = values; this.windowId = windowId; } } /** * Utility class for managing typed ArrayLists efficiently. In particular, this * can be useful for lists that we don't expect to be used often (eg, the exclude * lists), so we'd like to keep them nulled out by default. This causes the code to * become tedious, with constant null checks, code to allocate when necessary, * and code to null out the reference when the list is empty. This class encapsulates * all of that functionality into simple add()/remove() methods which perform the * necessary checks, allocation/null-out as appropriate, and return the * resulting list. */ private static class ArrayListManager { /** * Add the specified item to the list, returning the resulting list. * The returned list can either the be same list passed in or, if that * list was null, the new list that was created. * * Note that the list holds unique items; if the item already exists in the * list, the list is not modified. */ static <T> ArrayList<T> add(ArrayList<T> list, T item) { if (list == null) { list = new ArrayList<T>(); } if (!list.contains(item)) { list.add(item); } return list; } /** * Remove the specified item from the list, returning the resulting list. * The returned list can either the be same list passed in or, if that * list becomes empty as a result of the remove(), the new list was created. */ static <T> ArrayList<T> remove(ArrayList<T> list, T item) { if (list != null) { list.remove(item); if (list.isEmpty()) { list = null; } } return list; } } }