src/com/android/launcher3/LauncherStateManager.java - LeafOS-Project/android_packages_apps_Launcher3 - Gitiles

 /*
  * Copyright (C) 2015 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 com.android.launcher3;

 import static com.android.launcher3.LauncherState.NORMAL;
 import static com.android.launcher3.anim.PropertySetter.NO_ANIM_PROPERTY_SETTER;

 import android.animation.Animator;
 import android.animation.AnimatorListenerAdapter;
 import android.animation.AnimatorSet;
 import android.os.Handler;
 import android.os.Looper;
 import android.view.View;

 import com.android.launcher3.anim.AnimationSuccessListener;
 import com.android.launcher3.anim.AnimatorPlaybackController;
 import com.android.launcher3.anim.AnimatorSetBuilder;
 import com.android.launcher3.anim.PropertySetter;
 import com.android.launcher3.anim.PropertySetter.AnimatedPropertySetter;
 import com.android.launcher3.uioverrides.UiFactory;

 import java.util.ArrayList;

 /**
  * TODO: figure out what kind of tests we can write for this
  *
  * Things to test when changing the following class.
  *   - Home from workspace
  *          - from center screen
  *          - from other screens
  *   - Home from all apps
  *          - from center screen
  *          - from other screens
  *   - Back from all apps
  *          - from center screen
  *          - from other screens
  *   - Launch app from workspace and quit
  *          - with back
  *          - with home
  *   - Launch app from all apps and quit
  *          - with back
  *          - with home
  *   - Go to a screen that's not the default, then all
  *     apps, and launch and app, and go back
  *          - with back
  *          -with home
  *   - On workspace, long press power and go back
  *          - with back
  *          - with home
  *   - On all apps, long press power and go back
  *          - with back
  *          - with home
  *   - On workspace, power off
  *   - On all apps, power off
  *   - Launch an app and turn off the screen while in that app
  *          - Go back with home key
  *          - Go back with back key  TODO: make this not go to workspace
  *          - From all apps
  *          - From workspace
  *   - Enter and exit car mode (becase it causes an extra configuration changed)
  *          - From all apps
  *          - From the center workspace
  *          - From another workspace
  */
 public class LauncherStateManager {

     public static final String TAG = "StateManager";

     private final AnimationConfig mConfig = new AnimationConfig();
     private final Handler mUiHandler;
     private final Launcher mLauncher;
     private final ArrayList<StateListener> mListeners = new ArrayList<>();

     private StateHandler[] mStateHandlers;
     private LauncherState mState = NORMAL;

     private LauncherState mLastStableState = NORMAL;
     private LauncherState mCurrentStableState = NORMAL;

     private LauncherState mRestState;

     public LauncherStateManager(Launcher l) {
         mUiHandler = new Handler(Looper.getMainLooper());
         mLauncher = l;
     }

     public LauncherState getState() {
         return mState;
     }

     public StateHandler[] getStateHandlers() {
         if (mStateHandlers == null) {
             mStateHandlers = UiFactory.getStateHandler(mLauncher);
         }
         return mStateHandlers;
     }

     public void addStateListener(StateListener listener) {
         mListeners.add(listener);
     }

     public void removeStateListener(StateListener listener) {
         mListeners.remove(listener);
     }

     /**
      * @see #goToState(LauncherState, boolean, Runnable)
      */
     public void goToState(LauncherState state) {
         goToState(state, mLauncher.isStarted() /* animated */, 0, null);
     }

     /**
      * @see #goToState(LauncherState, boolean, Runnable)
      */
     public void goToState(LauncherState state, boolean animated) {
         goToState(state, animated, 0, null);
     }

     /**
      * Changes the Launcher state to the provided state.
      *
      * @param animated false if the state should change immediately without any animation,
      *                true otherwise
      * @paras onCompleteRunnable any action to perform at the end of the transition, of null.
      */
     public void goToState(LauncherState state, boolean animated, Runnable onCompleteRunnable) {
         goToState(state, animated, 0, onCompleteRunnable);
     }

     /**
      * Changes the Launcher state to the provided state after the given delay.
      */
     public void goToState(LauncherState state, long delay, Runnable onCompleteRunnable) {
         goToState(state, true, delay, onCompleteRunnable);
     }

     /**
      * Changes the Launcher state to the provided state after the given delay.
      */
     public void goToState(LauncherState state, long delay) {
         goToState(state, true, delay, null);
     }

     public void reapplyState() {
         if (mConfig.mCurrentAnimation == null) {
             for (StateHandler handler : getStateHandlers()) {
                 handler.setState(mState);
             }
         }
     }

     private void goToState(LauncherState state, boolean animated, long delay,
             final Runnable onCompleteRunnable) {
         if (mLauncher.isInState(state)) {
             if (mConfig.mCurrentAnimation == null) {
                 // Run any queued runnable
                 if (onCompleteRunnable != null) {
                     onCompleteRunnable.run();
                 }
                 return;
             } else if (!mConfig.userControlled && animated) {
                 // We are running the same animation as requested
                 if (onCompleteRunnable != null) {
                     mConfig.mCurrentAnimation.addListener(new AnimationSuccessListener() {
                         @Override
                         public void onAnimationSuccess(Animator animator) {
                             onCompleteRunnable.run();
                         }
                     });
                 }
                 return;
             }
         }

         // Cancel the current animation
         mConfig.reset();

         if (!animated) {
             onStateTransitionStart(state);
             for (StateHandler handler : getStateHandlers()) {
                 handler.setState(state);
             }

             for (int i = mListeners.size() - 1; i >= 0; i--) {
                 mListeners.get(i).onStateSetImmediately(state);
             }
             onStateTransitionEnd(state);

             // Run any queued runnable
             if (onCompleteRunnable != null) {
                 onCompleteRunnable.run();
             }
             return;
         }

         // Since state NORMAL can be reached from multiple states, just assume that the
         // transition plays in reverse and use the same duration as previous state.
         mConfig.duration = state == NORMAL ? mState.transitionDuration : state.transitionDuration;

         AnimatorSet animation = createAnimationToNewWorkspaceInternal(
                 state, new AnimatorSetBuilder(), onCompleteRunnable);
         Runnable runnable = new StartAnimRunnable(animation, state.getFinalFocus(mLauncher));
         if (delay > 0) {
             mUiHandler.postDelayed(runnable, delay);
         } else {
             mUiHandler.post(runnable);
         }
     }

     /**
      * Creates a {@link AnimatorPlaybackController} that can be used for a controlled
      * state transition.
      * @param state the final state for the transition.
      * @param duration intended duration for normal playback. Use higher duration for better
      *                accuracy.
      */
     public AnimatorPlaybackController createAnimationToNewWorkspace(
             LauncherState state, long duration) {
         return createAnimationToNewWorkspace(state, new AnimatorSetBuilder(), duration);
     }

     public AnimatorPlaybackController createAnimationToNewWorkspace(
             LauncherState state, AnimatorSetBuilder builder, long duration) {
         mConfig.reset();
         mConfig.userControlled = true;
         mConfig.duration = duration;
         return AnimatorPlaybackController.wrap(
                 createAnimationToNewWorkspaceInternal(state, builder, null), duration);
     }

     protected AnimatorSet createAnimationToNewWorkspaceInternal(final LauncherState state,
             AnimatorSetBuilder builder, final Runnable onCompleteRunnable) {

         for (StateHandler handler : getStateHandlers()) {
             builder.startTag(handler);
             handler.setStateWithAnimation(state, builder, mConfig);
         }

         final AnimatorSet animation = builder.build();
         animation.addListener(new AnimationSuccessListener() {

             @Override
             public void onAnimationStart(Animator animation) {
                 // Change the internal state only when the transition actually starts
                 onStateTransitionStart(state);
                 for (int i = mListeners.size() - 1; i >= 0; i--) {
                     mListeners.get(i).onStateTransitionStart(state);
                 }
             }

             @Override
             public void onAnimationEnd(Animator animation) {
                 super.onAnimationEnd(animation);
                 for (int i = mListeners.size() - 1; i >= 0; i--) {
                     mListeners.get(i).onStateTransitionComplete(state);
                 }
             }

             @Override
             public void onAnimationSuccess(Animator animator) {
                 // Run any queued runnables
                 if (onCompleteRunnable != null) {
                     onCompleteRunnable.run();
                 }
                 onStateTransitionEnd(state);
             }
         });
         mConfig.setAnimation(animation);
         return mConfig.mCurrentAnimation;
     }

     private void onStateTransitionStart(LauncherState state) {
         mState.onStateDisabled(mLauncher);
         mState = state;
         mState.onStateEnabled(mLauncher);
         mLauncher.getAppWidgetHost().setResumed(state == LauncherState.NORMAL);

         if (state.disablePageClipping) {
             // Only disable clipping if needed, otherwise leave it as previous value.
             mLauncher.getWorkspace().setClipChildren(false);
         }
         UiFactory.onLauncherStateOrResumeChanged(mLauncher);
     }

     private void onStateTransitionEnd(LauncherState state) {
         // Only change the stable states after the transitions have finished
         if (state != mCurrentStableState) {
             mLastStableState = state.getHistoryForState(mCurrentStableState);
             mCurrentStableState = state;
         }

         state.onStateTransitionEnd(mLauncher);
         mLauncher.getWorkspace().setClipChildren(!state.disablePageClipping);
         mLauncher.finishAutoCancelActionMode();

         if (state == NORMAL) {
             setRestState(null);
         }

         UiFactory.onLauncherStateOrFocusChanged(mLauncher);
         UiFactory.onLauncherStateOrResumeChanged(mLauncher);
     }

     public void onWindowFocusChanged() {
         UiFactory.onLauncherStateOrFocusChanged(mLauncher);
     }

     public LauncherState getLastState() {
         return mLastStableState;
     }

     public void moveToRestState() {
         if (mConfig.mCurrentAnimation != null && mConfig.userControlled) {
             // The user is doing something. Lets not mess it up
             return;
         }
         if (mState.disableRestore) {
             goToState(getRestState());
             // Reset history
             mLastStableState = NORMAL;
         }
     }

     public LauncherState getRestState() {
         return mRestState == null ? NORMAL : mRestState;
     }

     public void setRestState(LauncherState restState) {
         mRestState = restState;
     }

     /**
      * Cancels the current animation.
      */
     public void cancelAnimation() {
         mConfig.reset();
     }

     /**
      * Sets the animation as the current state animation, i.e., canceled when
      * starting another animation and may block some launcher interactions while running.
      */
     public void setCurrentAnimation(AnimatorSet anim) {
         cancelAnimation();
         mConfig.setAnimation(anim);
     }

     private class StartAnimRunnable implements Runnable {

         private final AnimatorSet mAnim;
         private final View mViewToFocus;

         public StartAnimRunnable(AnimatorSet anim, View viewToFocus) {
             mAnim = anim;
             mViewToFocus = viewToFocus;
         }

         @Override
         public void run() {
             if (mConfig.mCurrentAnimation != mAnim) {
                 return;
             }
             if (mViewToFocus != null) {
                 mViewToFocus.requestFocus();
             }
             mAnim.start();
         }
     }

     public static class AnimationConfig extends AnimatorListenerAdapter {
         public long duration;
         public boolean userControlled;
         private PropertySetter mProperSetter;

         private AnimatorSet mCurrentAnimation;

         public void reset() {
             duration = 0;
             userControlled = false;
             mProperSetter = null;

             if (mCurrentAnimation != null) {
                 mCurrentAnimation.setDuration(0);
                 mCurrentAnimation.cancel();
                 mCurrentAnimation = null;
             }
         }

         public PropertySetter getProperSetter(AnimatorSetBuilder builder) {
             if (mProperSetter == null) {
                 mProperSetter = duration == 0 ? NO_ANIM_PROPERTY_SETTER
                         : new AnimatedPropertySetter(duration, builder);
             }
             return mProperSetter;
         }

         @Override
         public void onAnimationEnd(Animator animation) {
             if (mCurrentAnimation == animation) {
                 mCurrentAnimation = null;
             }
         }

         public void setAnimation(AnimatorSet animation) {
             mCurrentAnimation = animation;
             mCurrentAnimation.addListener(this);
         }
     }

     public interface StateHandler {

         /**
          * Updates the UI to {@param state} without any animations
          */
         void setState(LauncherState state);

         /**
          * Sets the UI to {@param state} by animating any changes.
          */
         void setStateWithAnimation(LauncherState toState,
                 AnimatorSetBuilder builder, AnimationConfig config);
     }

     public interface StateListener {

         /**
          * Called when the state is set without an animation.
          */
         void onStateSetImmediately(LauncherState state);

         void onStateTransitionStart(LauncherState toState);
         void onStateTransitionComplete(LauncherState finalState);
     }
 }
	/*
	* Copyright (C) 2015 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 com.android.launcher3;

	import static com.android.launcher3.LauncherState.NORMAL;
	import static com.android.launcher3.anim.PropertySetter.NO_ANIM_PROPERTY_SETTER;

	import android.animation.Animator;
	import android.animation.AnimatorListenerAdapter;
	import android.animation.AnimatorSet;
	import android.os.Handler;
	import android.os.Looper;
	import android.view.View;

	import com.android.launcher3.anim.AnimationSuccessListener;
	import com.android.launcher3.anim.AnimatorPlaybackController;
	import com.android.launcher3.anim.AnimatorSetBuilder;
	import com.android.launcher3.anim.PropertySetter;
	import com.android.launcher3.anim.PropertySetter.AnimatedPropertySetter;
	import com.android.launcher3.uioverrides.UiFactory;

	import java.util.ArrayList;

	/**
	* TODO: figure out what kind of tests we can write for this
	*
	* Things to test when changing the following class.
	* - Home from workspace
	* - from center screen
	* - from other screens
	* - Home from all apps
	* - from center screen
	* - from other screens
	* - Back from all apps
	* - from center screen
	* - from other screens
	* - Launch app from workspace and quit
	* - with back
	* - with home
	* - Launch app from all apps and quit
	* - with back
	* - with home
	* - Go to a screen that's not the default, then all
	* apps, and launch and app, and go back
	* - with back
	* -with home
	* - On workspace, long press power and go back
	* - with back
	* - with home
	* - On all apps, long press power and go back
	* - with back
	* - with home
	* - On workspace, power off
	* - On all apps, power off
	* - Launch an app and turn off the screen while in that app
	* - Go back with home key
	* - Go back with back key TODO: make this not go to workspace
	* - From all apps
	* - From workspace
	* - Enter and exit car mode (becase it causes an extra configuration changed)
	* - From all apps
	* - From the center workspace
	* - From another workspace
	*/
	public class LauncherStateManager {

	public static final String TAG = "StateManager";

	private final AnimationConfig mConfig = new AnimationConfig();
	private final Handler mUiHandler;
	private final Launcher mLauncher;
	private final ArrayList<StateListener> mListeners = new ArrayList<>();

	private StateHandler[] mStateHandlers;
	private LauncherState mState = NORMAL;

	private LauncherState mLastStableState = NORMAL;
	private LauncherState mCurrentStableState = NORMAL;

	private LauncherState mRestState;

	public LauncherStateManager(Launcher l) {
	mUiHandler = new Handler(Looper.getMainLooper());
	mLauncher = l;
	}

	public LauncherState getState() {
	return mState;
	}

	public StateHandler[] getStateHandlers() {
	if (mStateHandlers == null) {
	mStateHandlers = UiFactory.getStateHandler(mLauncher);
	}
	return mStateHandlers;
	}

	public void addStateListener(StateListener listener) {
	mListeners.add(listener);
	}

	public void removeStateListener(StateListener listener) {
	mListeners.remove(listener);
	}

	/**
	* @see #goToState(LauncherState, boolean, Runnable)
	*/
	public void goToState(LauncherState state) {
	goToState(state, mLauncher.isStarted() /* animated */, 0, null);
	}

	/**
	* @see #goToState(LauncherState, boolean, Runnable)
	*/
	public void goToState(LauncherState state, boolean animated) {
	goToState(state, animated, 0, null);
	}

	/**
	* Changes the Launcher state to the provided state.
	*
	* @param animated false if the state should change immediately without any animation,
	* true otherwise
	* @paras onCompleteRunnable any action to perform at the end of the transition, of null.
	*/
	public void goToState(LauncherState state, boolean animated, Runnable onCompleteRunnable) {
	goToState(state, animated, 0, onCompleteRunnable);
	}

	/**
	* Changes the Launcher state to the provided state after the given delay.
	*/
	public void goToState(LauncherState state, long delay, Runnable onCompleteRunnable) {
	goToState(state, true, delay, onCompleteRunnable);
	}

	/**
	* Changes the Launcher state to the provided state after the given delay.
	*/
	public void goToState(LauncherState state, long delay) {
	goToState(state, true, delay, null);
	}

	public void reapplyState() {
	if (mConfig.mCurrentAnimation == null) {
	for (StateHandler handler : getStateHandlers()) {
	handler.setState(mState);
	}
	}
	}

	private void goToState(LauncherState state, boolean animated, long delay,
	final Runnable onCompleteRunnable) {
	if (mLauncher.isInState(state)) {
	if (mConfig.mCurrentAnimation == null) {
	// Run any queued runnable
	if (onCompleteRunnable != null) {
	onCompleteRunnable.run();
	}
	return;
	} else if (!mConfig.userControlled && animated) {
	// We are running the same animation as requested
	if (onCompleteRunnable != null) {
	mConfig.mCurrentAnimation.addListener(new AnimationSuccessListener() {
	@Override
	public void onAnimationSuccess(Animator animator) {
	onCompleteRunnable.run();
	}
	});
	}
	return;
	}
	}

	// Cancel the current animation
	mConfig.reset();

	if (!animated) {
	onStateTransitionStart(state);
	for (StateHandler handler : getStateHandlers()) {
	handler.setState(state);
	}

	for (int i = mListeners.size() - 1; i >= 0; i--) {
	mListeners.get(i).onStateSetImmediately(state);
	}
	onStateTransitionEnd(state);

	// Run any queued runnable
	if (onCompleteRunnable != null) {
	onCompleteRunnable.run();
	}
	return;
	}

	// Since state NORMAL can be reached from multiple states, just assume that the
	// transition plays in reverse and use the same duration as previous state.
	mConfig.duration = state == NORMAL ? mState.transitionDuration : state.transitionDuration;

	AnimatorSet animation = createAnimationToNewWorkspaceInternal(
	state, new AnimatorSetBuilder(), onCompleteRunnable);
	Runnable runnable = new StartAnimRunnable(animation, state.getFinalFocus(mLauncher));
	if (delay > 0) {
	mUiHandler.postDelayed(runnable, delay);
	} else {
	mUiHandler.post(runnable);
	}
	}

	/**
	* Creates a {@link AnimatorPlaybackController} that can be used for a controlled
	* state transition.
	* @param state the final state for the transition.
	* @param duration intended duration for normal playback. Use higher duration for better
	* accuracy.
	*/
	public AnimatorPlaybackController createAnimationToNewWorkspace(
	LauncherState state, long duration) {
	return createAnimationToNewWorkspace(state, new AnimatorSetBuilder(), duration);
	}

	public AnimatorPlaybackController createAnimationToNewWorkspace(
	LauncherState state, AnimatorSetBuilder builder, long duration) {
	mConfig.reset();
	mConfig.userControlled = true;
	mConfig.duration = duration;
	return AnimatorPlaybackController.wrap(
	createAnimationToNewWorkspaceInternal(state, builder, null), duration);
	}

	protected AnimatorSet createAnimationToNewWorkspaceInternal(final LauncherState state,
	AnimatorSetBuilder builder, final Runnable onCompleteRunnable) {

	for (StateHandler handler : getStateHandlers()) {
	builder.startTag(handler);
	handler.setStateWithAnimation(state, builder, mConfig);
	}

	final AnimatorSet animation = builder.build();
	animation.addListener(new AnimationSuccessListener() {

	@Override
	public void onAnimationStart(Animator animation) {
	// Change the internal state only when the transition actually starts
	onStateTransitionStart(state);
	for (int i = mListeners.size() - 1; i >= 0; i--) {
	mListeners.get(i).onStateTransitionStart(state);
	}
	}

	@Override
	public void onAnimationEnd(Animator animation) {
	super.onAnimationEnd(animation);
	for (int i = mListeners.size() - 1; i >= 0; i--) {
	mListeners.get(i).onStateTransitionComplete(state);
	}
	}

	@Override
	public void onAnimationSuccess(Animator animator) {
	// Run any queued runnables
	if (onCompleteRunnable != null) {
	onCompleteRunnable.run();
	}
	onStateTransitionEnd(state);
	}
	});
	mConfig.setAnimation(animation);
	return mConfig.mCurrentAnimation;
	}

	private void onStateTransitionStart(LauncherState state) {
	mState.onStateDisabled(mLauncher);
	mState = state;
	mState.onStateEnabled(mLauncher);
	mLauncher.getAppWidgetHost().setResumed(state == LauncherState.NORMAL);

	if (state.disablePageClipping) {
	// Only disable clipping if needed, otherwise leave it as previous value.
	mLauncher.getWorkspace().setClipChildren(false);
	}
	UiFactory.onLauncherStateOrResumeChanged(mLauncher);
	}

	private void onStateTransitionEnd(LauncherState state) {
	// Only change the stable states after the transitions have finished
	if (state != mCurrentStableState) {
	mLastStableState = state.getHistoryForState(mCurrentStableState);
	mCurrentStableState = state;
	}

	state.onStateTransitionEnd(mLauncher);
	mLauncher.getWorkspace().setClipChildren(!state.disablePageClipping);
	mLauncher.finishAutoCancelActionMode();

	if (state == NORMAL) {
	setRestState(null);
	}

	UiFactory.onLauncherStateOrFocusChanged(mLauncher);
	UiFactory.onLauncherStateOrResumeChanged(mLauncher);
	}

	public void onWindowFocusChanged() {
	UiFactory.onLauncherStateOrFocusChanged(mLauncher);
	}

	public LauncherState getLastState() {
	return mLastStableState;
	}

	public void moveToRestState() {
	if (mConfig.mCurrentAnimation != null && mConfig.userControlled) {
	// The user is doing something. Lets not mess it up
	return;
	}
	if (mState.disableRestore) {
	goToState(getRestState());
	// Reset history
	mLastStableState = NORMAL;
	}
	}

	public LauncherState getRestState() {
	return mRestState == null ? NORMAL : mRestState;
	}

	public void setRestState(LauncherState restState) {
	mRestState = restState;
	}

	/**
	* Cancels the current animation.
	*/
	public void cancelAnimation() {
	mConfig.reset();
	}

	/**
	* Sets the animation as the current state animation, i.e., canceled when
	* starting another animation and may block some launcher interactions while running.
	*/
	public void setCurrentAnimation(AnimatorSet anim) {
	cancelAnimation();
	mConfig.setAnimation(anim);
	}

	private class StartAnimRunnable implements Runnable {

	private final AnimatorSet mAnim;
	private final View mViewToFocus;

	public StartAnimRunnable(AnimatorSet anim, View viewToFocus) {
	mAnim = anim;
	mViewToFocus = viewToFocus;
	}

	@Override
	public void run() {
	if (mConfig.mCurrentAnimation != mAnim) {
	return;
	}
	if (mViewToFocus != null) {
	mViewToFocus.requestFocus();
	}
	mAnim.start();
	}
	}

	public static class AnimationConfig extends AnimatorListenerAdapter {
	public long duration;
	public boolean userControlled;
	private PropertySetter mProperSetter;

	private AnimatorSet mCurrentAnimation;

	public void reset() {
	duration = 0;
	userControlled = false;
	mProperSetter = null;

	if (mCurrentAnimation != null) {
	mCurrentAnimation.setDuration(0);
	mCurrentAnimation.cancel();
	mCurrentAnimation = null;
	}
	}

	public PropertySetter getProperSetter(AnimatorSetBuilder builder) {
	if (mProperSetter == null) {
	mProperSetter = duration == 0 ? NO_ANIM_PROPERTY_SETTER
	: new AnimatedPropertySetter(duration, builder);
	}
	return mProperSetter;
	}

	@Override
	public void onAnimationEnd(Animator animation) {
	if (mCurrentAnimation == animation) {
	mCurrentAnimation = null;
	}
	}

	public void setAnimation(AnimatorSet animation) {
	mCurrentAnimation = animation;
	mCurrentAnimation.addListener(this);
	}
	}

	public interface StateHandler {

	/**
	* Updates the UI to {@param state} without any animations
	*/
	void setState(LauncherState state);

	/**
	* Sets the UI to {@param state} by animating any changes.
	*/
	void setStateWithAnimation(LauncherState toState,
	AnimatorSetBuilder builder, AnimationConfig config);
	}

	public interface StateListener {

	/**
	* Called when the state is set without an animation.
	*/
	void onStateSetImmediately(LauncherState state);

	void onStateTransitionStart(LauncherState toState);
	void onStateTransitionComplete(LauncherState finalState);
	}
	}