Merge "Split out logic in RecentsViewStateController." into ub-launcher3-master
diff --git a/go/quickstep/src/com/android/launcher3/uioverrides/RecentsUiFactory.java b/go/quickstep/src/com/android/launcher3/uioverrides/RecentsUiFactory.java
index f2c9455..d0c255c 100644
--- a/go/quickstep/src/com/android/launcher3/uioverrides/RecentsUiFactory.java
+++ b/go/quickstep/src/com/android/launcher3/uioverrides/RecentsUiFactory.java
@@ -23,9 +23,7 @@
 import android.view.View;
 
 import com.android.launcher3.Launcher;
-import com.android.launcher3.LauncherStateManager;
 import com.android.launcher3.LauncherStateManager.StateHandler;
-import com.android.launcher3.uioverrides.RecentsViewStateController;
 import com.android.launcher3.util.TouchController;
 
 /**
@@ -56,7 +54,6 @@
      * @return state handler for recents
      */
     public static StateHandler createRecentsViewStateController(Launcher launcher) {
-        //TODO Override RecentsViewStateController on low RAM.
         return new RecentsViewStateController(launcher);
     }
 
diff --git a/go/quickstep/src/com/android/launcher3/uioverrides/RecentsViewStateController.java b/go/quickstep/src/com/android/launcher3/uioverrides/RecentsViewStateController.java
new file mode 100644
index 0000000..f1cb75b
--- /dev/null
+++ b/go/quickstep/src/com/android/launcher3/uioverrides/RecentsViewStateController.java
@@ -0,0 +1,47 @@
+/*
+ * Copyright (C) 2019 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.uioverrides;
+
+import static com.android.quickstep.views.IconRecentsView.CONTENT_ALPHA;
+import static com.android.quickstep.views.IconRecentsView.TRANSLATION_Y_FACTOR;
+
+import android.util.FloatProperty;
+
+import androidx.annotation.NonNull;
+
+import com.android.launcher3.Launcher;
+import com.android.quickstep.views.IconRecentsView;
+
+/**
+ * State handler for Go's {@link IconRecentsView}.
+ */
+public final class RecentsViewStateController extends
+        BaseRecentsViewStateController<IconRecentsView> {
+
+    public RecentsViewStateController(@NonNull Launcher launcher) {
+        super(launcher);
+    }
+
+    @Override
+    FloatProperty<IconRecentsView> getTranslationYFactorProperty() {
+        return TRANSLATION_Y_FACTOR;
+    }
+
+    @Override
+    FloatProperty<IconRecentsView> getContentAlphaProperty() {
+        return CONTENT_ALPHA;
+    }
+}
diff --git a/quickstep/recents_ui_overrides/src/com/android/launcher3/uioverrides/RecentsViewStateController.java b/quickstep/recents_ui_overrides/src/com/android/launcher3/uioverrides/RecentsViewStateController.java
new file mode 100644
index 0000000..7d7946d
--- /dev/null
+++ b/quickstep/recents_ui_overrides/src/com/android/launcher3/uioverrides/RecentsViewStateController.java
@@ -0,0 +1,102 @@
+/*
+ * Copyright (C) 2017 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.uioverrides;
+
+import static com.android.launcher3.LauncherState.FAST_OVERVIEW;
+import static com.android.launcher3.LauncherState.OVERVIEW;
+import static com.android.quickstep.QuickScrubController.QUICK_SCRUB_START_INTERPOLATOR;
+import static com.android.quickstep.QuickScrubController.QUICK_SCRUB_TRANSLATION_Y_FACTOR;
+import static com.android.quickstep.views.LauncherRecentsView.TRANSLATION_Y_FACTOR;
+import static com.android.quickstep.views.RecentsView.CONTENT_ALPHA;
+
+import android.animation.ValueAnimator;
+import android.annotation.TargetApi;
+import android.os.Build;
+import android.util.FloatProperty;
+import android.view.animation.Interpolator;
+
+import androidx.annotation.NonNull;
+
+import com.android.launcher3.Launcher;
+import com.android.launcher3.LauncherState;
+import com.android.launcher3.LauncherStateManager.AnimationConfig;
+import com.android.launcher3.anim.AnimatorSetBuilder;
+import com.android.launcher3.anim.Interpolators;
+import com.android.quickstep.views.LauncherRecentsView;
+import com.android.quickstep.views.RecentsView;
+
+/**
+ * State handler for handling UI changes for {@link LauncherRecentsView}. In addition to managing
+ * the basic view properties, this class also manages changes in the task visuals.
+ */
+@TargetApi(Build.VERSION_CODES.O)
+public final class RecentsViewStateController extends
+        BaseRecentsViewStateController<LauncherRecentsView> {
+
+    public RecentsViewStateController(Launcher launcher) {
+        super(launcher);
+    }
+
+    @Override
+    public void setState(@NonNull LauncherState state) {
+        super.setState(state);
+        if (state.overviewUi) {
+            mRecentsView.updateEmptyMessage();
+            mRecentsView.resetTaskVisuals();
+        }
+    }
+
+    @Override
+    void setStateWithAnimationInternal(@NonNull final LauncherState toState,
+            @NonNull AnimatorSetBuilder builder, @NonNull AnimationConfig config) {
+        super.setStateWithAnimationInternal(toState, builder, config);
+
+        if (!toState.overviewUi) {
+            builder.addOnFinishRunnable(mRecentsView::resetTaskVisuals);
+        }
+
+        if (toState.overviewUi) {
+            ValueAnimator updateAnim = ValueAnimator.ofFloat(0, 1);
+            updateAnim.addUpdateListener(valueAnimator -> {
+                // While animating into recents, update the visible task data as needed
+                mRecentsView.loadVisibleTaskData();
+            });
+            updateAnim.setDuration(config.duration);
+            builder.play(updateAnim);
+            mRecentsView.updateEmptyMessage();
+        }
+    }
+
+    @Override
+    Interpolator getScaleAndTransYInterpolator(@NonNull LauncherState toState,
+            @NonNull AnimatorSetBuilder builder) {
+        if (mLauncher.getStateManager().getState() == OVERVIEW && toState == FAST_OVERVIEW) {
+            return Interpolators.clampToProgress(QUICK_SCRUB_START_INTERPOLATOR, 0,
+                    QUICK_SCRUB_TRANSLATION_Y_FACTOR);
+        }
+        return super.getScaleAndTransYInterpolator(toState, builder);
+    }
+
+    @Override
+    FloatProperty<LauncherRecentsView> getTranslationYFactorProperty() {
+        return TRANSLATION_Y_FACTOR;
+    }
+
+    @Override
+    FloatProperty<RecentsView> getContentAlphaProperty() {
+        return CONTENT_ALPHA;
+    }
+}
diff --git a/quickstep/src/com/android/launcher3/uioverrides/BaseRecentsViewStateController.java b/quickstep/src/com/android/launcher3/uioverrides/BaseRecentsViewStateController.java
new file mode 100644
index 0000000..df9dbe4
--- /dev/null
+++ b/quickstep/src/com/android/launcher3/uioverrides/BaseRecentsViewStateController.java
@@ -0,0 +1,117 @@
+/*
+ * Copyright (C) 2019 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.uioverrides;
+
+import static com.android.launcher3.LauncherAnimUtils.SCALE_PROPERTY;
+import static com.android.launcher3.anim.AnimatorSetBuilder.ANIM_OVERVIEW_FADE;
+import static com.android.launcher3.anim.AnimatorSetBuilder.ANIM_OVERVIEW_SCALE;
+import static com.android.launcher3.anim.Interpolators.AGGRESSIVE_EASE_IN_OUT;
+import static com.android.launcher3.anim.Interpolators.LINEAR;
+
+import android.util.FloatProperty;
+import android.view.View;
+import android.view.animation.Interpolator;
+
+import androidx.annotation.NonNull;
+
+import com.android.launcher3.Launcher;
+import com.android.launcher3.LauncherState;
+import com.android.launcher3.LauncherStateManager.AnimationConfig;
+import com.android.launcher3.LauncherStateManager.StateHandler;
+import com.android.launcher3.anim.AnimatorSetBuilder;
+import com.android.launcher3.anim.PropertySetter;
+
+/**
+ * State handler for recents view. Manages UI changes and animations for recents view based off the
+ * current {@link LauncherState}.
+ *
+ * @param <T> the recents view
+ */
+public abstract class BaseRecentsViewStateController<T extends View>
+        implements StateHandler {
+    protected final T mRecentsView;
+    protected final Launcher mLauncher;
+
+    public BaseRecentsViewStateController(@NonNull Launcher launcher) {
+        mLauncher = launcher;
+        mRecentsView = launcher.getOverviewPanel();
+    }
+
+    @Override
+    public void setState(@NonNull LauncherState state) {
+        float[] scaleTranslationYFactor = state.getOverviewScaleAndTranslationYFactor(mLauncher);
+        SCALE_PROPERTY.set(mRecentsView, scaleTranslationYFactor[0]);
+        getTranslationYFactorProperty().set(mRecentsView, scaleTranslationYFactor[1]);
+        getContentAlphaProperty().set(mRecentsView, state.overviewUi ? 1f : 0);
+    }
+
+    @Override
+    public final void setStateWithAnimation(@NonNull final LauncherState toState,
+            @NonNull AnimatorSetBuilder builder, @NonNull AnimationConfig config) {
+        if (!config.playAtomicComponent()) {
+            // The entire recents animation is played atomically.
+            return;
+        }
+        setStateWithAnimationInternal(toState, builder, config);
+    }
+
+    /**
+     * Core logic for animating the recents view UI.
+     *
+     * @param toState state to animate to
+     * @param builder animator set builder
+     * @param config current animation config
+     */
+    void setStateWithAnimationInternal(@NonNull final LauncherState toState,
+            @NonNull AnimatorSetBuilder builder, @NonNull AnimationConfig config) {
+        PropertySetter setter = config.getPropertySetter(builder);
+        float[] scaleTranslationYFactor = toState.getOverviewScaleAndTranslationYFactor(mLauncher);
+        Interpolator scaleAndTransYInterpolator = getScaleAndTransYInterpolator(toState, builder);
+        setter.setFloat(mRecentsView, SCALE_PROPERTY, scaleTranslationYFactor[0],
+                scaleAndTransYInterpolator);
+        setter.setFloat(mRecentsView, getTranslationYFactorProperty(), scaleTranslationYFactor[1],
+                scaleAndTransYInterpolator);
+        setter.setFloat(mRecentsView, getContentAlphaProperty(), toState.overviewUi ? 1 : 0,
+                builder.getInterpolator(ANIM_OVERVIEW_FADE, AGGRESSIVE_EASE_IN_OUT));
+    }
+
+    /**
+     * Get the interpolator to use for the scale and translation Y animation for the view.
+     *
+     * @param toState state to animate to
+     * @param builder animator set builder
+     * @return interpolator for scale and trans Y recents view animation
+     */
+    Interpolator getScaleAndTransYInterpolator(@NonNull final LauncherState toState,
+            @NonNull AnimatorSetBuilder builder) {
+        return builder.getInterpolator(ANIM_OVERVIEW_SCALE, LINEAR);
+    }
+
+    /**
+     * Get property for translation Y factor for the recents view.
+     *
+     * @return the float property for the recents view
+     */
+    abstract FloatProperty getTranslationYFactorProperty();
+
+    /**
+     * Get property for content alpha for the recents view.
+     *
+     * @return the float property for the view's content alpha
+     */
+    abstract FloatProperty getContentAlphaProperty();
+}
diff --git a/quickstep/src/com/android/launcher3/uioverrides/RecentsViewStateController.java b/quickstep/src/com/android/launcher3/uioverrides/RecentsViewStateController.java
deleted file mode 100644
index abd2846..0000000
--- a/quickstep/src/com/android/launcher3/uioverrides/RecentsViewStateController.java
+++ /dev/null
@@ -1,104 +0,0 @@
-/*
- * Copyright (C) 2017 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.uioverrides;
-
-import static com.android.launcher3.LauncherAnimUtils.SCALE_PROPERTY;
-import static com.android.launcher3.LauncherState.FAST_OVERVIEW;
-import static com.android.launcher3.LauncherState.OVERVIEW;
-import static com.android.launcher3.anim.AnimatorSetBuilder.ANIM_OVERVIEW_FADE;
-import static com.android.launcher3.anim.AnimatorSetBuilder.ANIM_OVERVIEW_SCALE;
-import static com.android.launcher3.anim.Interpolators.AGGRESSIVE_EASE_IN_OUT;
-import static com.android.launcher3.anim.Interpolators.LINEAR;
-import static com.android.quickstep.QuickScrubController.QUICK_SCRUB_START_INTERPOLATOR;
-import static com.android.quickstep.QuickScrubController.QUICK_SCRUB_TRANSLATION_Y_FACTOR;
-import static com.android.quickstep.views.LauncherRecentsView.TRANSLATION_Y_FACTOR;
-import static com.android.quickstep.views.RecentsView.CONTENT_ALPHA;
-
-import android.animation.ValueAnimator;
-import android.annotation.TargetApi;
-import android.os.Build;
-import android.view.animation.Interpolator;
-
-import com.android.launcher3.Launcher;
-import com.android.launcher3.LauncherState;
-import com.android.launcher3.LauncherStateManager.AnimationConfig;
-import com.android.launcher3.LauncherStateManager.StateHandler;
-import com.android.launcher3.anim.AnimatorSetBuilder;
-import com.android.launcher3.anim.Interpolators;
-import com.android.launcher3.anim.PropertySetter;
-import com.android.quickstep.views.LauncherRecentsView;
-
-@TargetApi(Build.VERSION_CODES.O)
-public class RecentsViewStateController implements StateHandler {
-
-    private final Launcher mLauncher;
-    private final LauncherRecentsView mRecentsView;
-
-    public RecentsViewStateController(Launcher launcher) {
-        mLauncher = launcher;
-        mRecentsView = launcher.getOverviewPanel();
-    }
-
-    @Override
-    public void setState(LauncherState state) {
-        mRecentsView.setContentAlpha(state.overviewUi ? 1 : 0);
-        float[] scaleTranslationYFactor = state.getOverviewScaleAndTranslationYFactor(mLauncher);
-        SCALE_PROPERTY.set(mRecentsView, scaleTranslationYFactor[0]);
-        mRecentsView.setTranslationYFactor(scaleTranslationYFactor[1]);
-        if (state.overviewUi) {
-            mRecentsView.updateEmptyMessage();
-            mRecentsView.resetTaskVisuals();
-        }
-    }
-
-    @Override
-    public void setStateWithAnimation(final LauncherState toState,
-            AnimatorSetBuilder builder, AnimationConfig config) {
-        if (!config.playAtomicComponent()) {
-            // The entire recents animation is played atomically.
-            return;
-        }
-        PropertySetter setter = config.getPropertySetter(builder);
-        float[] scaleTranslationYFactor = toState.getOverviewScaleAndTranslationYFactor(mLauncher);
-        Interpolator scaleAndTransYInterpolator = builder.getInterpolator(
-                ANIM_OVERVIEW_SCALE, LINEAR);
-        if (mLauncher.getStateManager().getState() == OVERVIEW && toState == FAST_OVERVIEW) {
-            scaleAndTransYInterpolator = Interpolators.clampToProgress(
-                    QUICK_SCRUB_START_INTERPOLATOR, 0, QUICK_SCRUB_TRANSLATION_Y_FACTOR);
-        }
-        setter.setFloat(mRecentsView, SCALE_PROPERTY, scaleTranslationYFactor[0],
-                scaleAndTransYInterpolator);
-        setter.setFloat(mRecentsView, TRANSLATION_Y_FACTOR, scaleTranslationYFactor[1],
-                scaleAndTransYInterpolator);
-        setter.setFloat(mRecentsView, CONTENT_ALPHA, toState.overviewUi ? 1 : 0,
-                builder.getInterpolator(ANIM_OVERVIEW_FADE, AGGRESSIVE_EASE_IN_OUT));
-
-        if (!toState.overviewUi) {
-            builder.addOnFinishRunnable(mRecentsView::resetTaskVisuals);
-        }
-
-        if (toState.overviewUi) {
-            ValueAnimator updateAnim = ValueAnimator.ofFloat(0, 1);
-            updateAnim.addUpdateListener(valueAnimator -> {
-                // While animating into recents, update the visible task data as needed
-                mRecentsView.loadVisibleTaskData();
-            });
-            updateAnim.setDuration(config.duration);
-            builder.play(updateAnim);
-            mRecentsView.updateEmptyMessage();
-        }
-    }
-}