Merge "Adding CannedAnimationCoordinator to enable running a predefined animation in Launcher" into udc-qpr-dev

src/com/android/launcher3/Launcher.java

@@ -198,6 +198,7 @@ import com.android.launcher3.touch.ItemLongClickListener;
 import com.android.launcher3.uioverrides.plugins.PluginManagerWrapper;
 import com.android.launcher3.util.ActivityResultInfo;
 import com.android.launcher3.util.ActivityTracker;
+import com.android.launcher3.util.CannedAnimationCoordinator;
 import com.android.launcher3.util.ComponentKey;
 import com.android.launcher3.util.IntArray;
 import com.android.launcher3.util.IntSet;
@@ -421,6 +422,9 @@ public class Launcher extends StatefulActivity<LauncherState>
     private StartupLatencyLogger mStartupLatencyLogger;
     private CellPosMapper mCellPosMapper = CellPosMapper.DEFAULT;
 
+    private final CannedAnimationCoordinator mAnimationCoordinator =
+            new CannedAnimationCoordinator(this);
+
     @Override
     @TargetApi(Build.VERSION_CODES.S)
     protected void onCreate(Bundle savedInstanceState) {
@@ -3422,4 +3426,11 @@ public class Launcher extends StatefulActivity<LauncherState>
     public void launchAppPair(WorkspaceItemInfo app1, WorkspaceItemInfo app2) {
         // Overridden
     }
+
+    /**
+     * Returns the animation coordinator for playing one-off animations
+     */
+    public CannedAnimationCoordinator getAnimationCoordinator() {
+        return mAnimationCoordinator;
+    }
 }

src/com/android/launcher3/util/CannedAnimationCoordinator.kt

@@ -0,0 +1,164 @@
+/*
+ * Copyright (C) 2023 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.util
+
+import android.animation.AnimatorSet
+import android.animation.ValueAnimator
+import android.util.Log
+import android.view.ViewTreeObserver.OnGlobalLayoutListener
+import androidx.core.view.OneShotPreDrawListener
+import com.android.app.animation.Interpolators.LINEAR
+import com.android.launcher3.anim.AnimatorListeners
+import com.android.launcher3.anim.AnimatorPlaybackController
+import com.android.launcher3.anim.PendingAnimation
+import com.android.launcher3.statemanager.StatefulActivity
+import java.util.function.Consumer
+
+private const val TAG = "CannedAnimCoordinator"
+
+/**
+ * Utility class to run a canned animation on Launcher.
+ *
+ * This class takes care to registering animations with stateManager and ensures that only one
+ * animation is playing at a time.
+ */
+class CannedAnimationCoordinator(private val activity: StatefulActivity<*>) {
+
+    private val launcherLayoutListener = OnGlobalLayoutListener { scheduleRecreateAnimOnPreDraw() }
+    private var recreatePending = false
+
+    private var animationProvider: Any? = null
+
+    private var animationDuration: Long = 0L
+    private var animationFactory: Consumer<PendingAnimation>? = null
+    private var animationController: AnimatorPlaybackController? = null
+
+    private var currentAnim: AnimatorPlaybackController? = null
+
+    /**
+     * Sets the current animation cancelling any previously set animation.
+     *
+     * Callers can control the animation using {@link #getPlaybackController}. The state is
+     * automatically cleared when the playback controller ends. The animation is automatically
+     * recreated when any layout change happens. Callers can also ask for recreation by calling
+     * {@link #recreateAnimation}
+     */
+    fun setAnimation(provider: Any, factory: Consumer<PendingAnimation>, duration: Long) {
+        if (provider != animationProvider) {
+            Log.e(TAG, "Trying to play two animations together, $provider and $animationProvider")
+        }
+
+        // Cancel any previously running animation
+        endCurrentAnimation(false)
+        animationController?.dispatchOnCancel()?.dispatchOnEnd()
+
+        animationProvider = provider
+        animationFactory = factory
+        animationDuration = duration
+
+        // Setup a new controller and link it with launcher state animation
+        val anim = AnimatorSet()
+        anim.play(
+            ValueAnimator.ofFloat(0f, 1f).apply {
+                interpolator = LINEAR
+                this.duration = duration
+                addUpdateListener { anim -> currentAnim?.setPlayFraction(anim.animatedFraction) }
+            }
+        )
+        val controller = AnimatorPlaybackController.wrap(anim, duration)
+        anim.addListener(
+            AnimatorListeners.forEndCallback { success ->
+                if (animationController != controller) {
+                    return@forEndCallback
+                }
+
+                endCurrentAnimation(success)
+                animationController = null
+                animationFactory = null
+                animationProvider = null
+
+                activity.rootView.viewTreeObserver.apply {
+                    if (isAlive) {
+                        removeOnGlobalLayoutListener(launcherLayoutListener)
+                    }
+                }
+            }
+        )
+
+        // Recreate animation whenever layout happens in case transforms change during layout
+        activity.rootView.viewTreeObserver.apply {
+            if (isAlive) {
+                addOnGlobalLayoutListener(launcherLayoutListener)
+            }
+        }
+        // Link this to the state manager so that it auto-cancels when state changes
+        recreatePending = false
+        animationController =
+            controller.apply { activity.stateManager.setCurrentUserControlledAnimation(this) }
+        recreateAnimation(provider)
+    }
+
+    private fun endCurrentAnimation(success: Boolean) {
+        currentAnim?.apply {
+            // When cancelling an animation, apply final progress so that all transformations
+            // are restored
+            setPlayFraction(1f)
+            if (!success) dispatchOnCancel()
+            dispatchOnEnd()
+        }
+        currentAnim = null
+    }
+
+    /** Returns the current animation controller to control the animation */
+    fun getPlaybackController(provider: Any): AnimatorPlaybackController? {
+        return if (provider == animationProvider) animationController
+        else {
+            Log.d(TAG, "Wrong controller access from $provider, actual provider $animationProvider")
+            null
+        }
+    }
+
+    private fun scheduleRecreateAnimOnPreDraw() {
+        if (!recreatePending) {
+            recreatePending = true
+            OneShotPreDrawListener.add(activity.rootView) {
+                if (recreatePending) {
+                    recreatePending = false
+                    animationProvider?.apply { recreateAnimation(this) }
+                }
+            }
+        }
+    }
+
+    /** Notify the controller to recreate the animation. The animation progress is preserved */
+    fun recreateAnimation(provider: Any) {
+        if (provider != animationProvider) {
+            Log.e(TAG, "Ignore recreate request from $provider, actual provider $animationProvider")
+            return
+        }
+        endCurrentAnimation(false /* success */)
+
+        if (animationFactory == null || animationController == null) {
+            return
+        }
+        currentAnim =
+            PendingAnimation(animationDuration)
+                .apply { animationFactory?.accept(this) }
+                .createPlaybackController()
+                .apply { setPlayFraction(animationController!!.progressFraction) }
+    }
+}

src/com/android/launcher3/util/MultiScalePropertyFactory.java

@@ -40,8 +40,7 @@ public class MultiScalePropertyFactory<T extends View> {
     private static final boolean DEBUG = false;
     private static final String TAG = "MultiScaleProperty";
     private final String mName;
-    private final ArrayMap<Integer, MultiScaleProperty> mProperties =
-            new ArrayMap<Integer, MultiScaleProperty>();
+    private final ArrayMap<Integer, MultiScaleProperty> mProperties = new ArrayMap<>();
 
     // This is an optimization for cases when set is called repeatedly with the same setterIndex.
     private float mMinOfOthers = 0;
@@ -55,7 +54,7 @@ public class MultiScalePropertyFactory<T extends View> {
     }
 
     /** Returns the [MultiFloatProperty] associated with [inx], creating it if not present. */
-    public MultiScaleProperty get(Integer index) {
+    public FloatProperty<T> get(Integer index) {
         return mProperties.computeIfAbsent(index,
                 (k) -> new MultiScaleProperty(index, mName + "_" + index));
     }