Merge "Fade back button in and out tied with the overview/shelf (2/3)" into ub-launcher3-edmonton

quickstep/src/com/android/launcher3/uioverrides/UiFactory.java

@@ -93,7 +93,11 @@ public class UiFactory {
                     TYPE_ALL & ~TYPE_HIDE_BACK_BUTTON) == null;
         }
         OverviewInteractionState.getInstance(launcher)
-                .setBackButtonVisible(!shouldBackButtonBeHidden);
+                .setBackButtonAlpha(shouldBackButtonBeHidden ? 0 : 1, true /* animate */);
+    }
+
+    public static void setBackButtonAlpha(Launcher launcher, float alpha, boolean animate) {
+         OverviewInteractionState.getInstance(launcher).setBackButtonAlpha(alpha,animate);
     }
 
     public static void resetOverview(Launcher launcher) {

quickstep/src/com/android/quickstep/OverviewInteractionState.java

@@ -17,7 +17,6 @@ package com.android.quickstep;
 
 import static com.android.systemui.shared.system.NavigationBarCompat.FLAG_DISABLE_QUICK_SCRUB;
 import static com.android.systemui.shared.system.NavigationBarCompat.FLAG_DISABLE_SWIPE_UP;
-import static com.android.systemui.shared.system.NavigationBarCompat.FLAG_HIDE_BACK_BUTTON;
 import static com.android.systemui.shared.system.NavigationBarCompat.FLAG_SHOW_OVERVIEW_BUTTON;
 import static com.android.systemui.shared.system.SettingsCompat.SWIPE_UP_SETTING_NAME;
 
@@ -46,7 +45,6 @@ import java.util.concurrent.ExecutionException;
  *
  *   - FLAG_DISABLE_QUICK_SCRUB
  *   - FLAG_DISABLE_SWIPE_UP
- *   - FLAG_HIDE_BACK_BUTTON
  *   - FLAG_SHOW_OVERVIEW_BUTTON
  *
  * @see com.android.systemui.shared.system.NavigationBarCompat.InteractionType and associated flags.
@@ -81,7 +79,7 @@ public class OverviewInteractionState {
     }
 
     private static final int MSG_SET_PROXY = 200;
-    private static final int MSG_SET_BACK_BUTTON_VISIBLE = 201;
+    private static final int MSG_SET_BACK_BUTTON_ALPHA = 201;
     private static final int MSG_SET_SWIPE_UP_ENABLED = 202;
 
     private final SwipeUpGestureEnabledSettingObserver mSwipeUpSettingObserver;
@@ -92,13 +90,16 @@ public class OverviewInteractionState {
 
     // These are updated on the background thread
     private ISystemUiProxy mISystemUiProxy;
-    private boolean mBackButtonVisible = true;
     private boolean mSwipeUpEnabled = true;
 
     private Runnable mOnSwipeUpSettingChangedListener;
 
     private OverviewInteractionState(Context context) {
         mContext = context;
+
+        // Data posted to the uihandler will be sent to the bghandler. Data is sent to uihandler
+        // because of its high send frequency and data may be very different than the previous value
+        // For example, send back alpha on uihandler to avoid flickering when setting its visibility
         mUiHandler = new Handler(this::handleUiMessage);
         mBgHandler = new Handler(UiThreadHelper.getBackgroundLooper(), this::handleBgMessage);
 
@@ -116,9 +117,9 @@ public class OverviewInteractionState {
         return mSwipeUpEnabled;
     }
 
-    public void setBackButtonVisible(boolean visible) {
+    public void setBackButtonAlpha(float alpha, boolean animate) {
-        mUiHandler.removeMessages(MSG_SET_BACK_BUTTON_VISIBLE);
+        mUiHandler.removeMessages(MSG_SET_BACK_BUTTON_ALPHA);
-        mUiHandler.obtainMessage(MSG_SET_BACK_BUTTON_VISIBLE, visible ? 1 : 0, 0)
+        mUiHandler.obtainMessage(MSG_SET_BACK_BUTTON_ALPHA, animate ? 1 : 0, 0, alpha)
                 .sendToTarget();
     }
 
@@ -127,7 +128,7 @@ public class OverviewInteractionState {
     }
 
     private boolean handleUiMessage(Message msg) {
-        mBgHandler.obtainMessage(msg.what, msg.arg1, msg.arg2).sendToTarget();
+        mBgHandler.obtainMessage(msg.what, msg.arg1, msg.arg2, msg.obj).sendToTarget();
         return true;
     }
 
@@ -136,9 +137,9 @@ public class OverviewInteractionState {
             case MSG_SET_PROXY:
                 mISystemUiProxy = (ISystemUiProxy) msg.obj;
                 break;
-            case MSG_SET_BACK_BUTTON_VISIBLE:
+            case MSG_SET_BACK_BUTTON_ALPHA:
-                mBackButtonVisible = msg.arg1 != 0;
+                applyBackButtonAlpha((float) msg.obj, msg.arg1 == 1);
-                break;
+                return true;
             case MSG_SET_SWIPE_UP_ENABLED:
                 mSwipeUpEnabled = msg.arg1 != 0;
                 resetHomeBounceSeenOnQuickstepEnabledFirstTime();
@@ -162,10 +163,8 @@ public class OverviewInteractionState {
             return;
         }
 
-        int flags;
+        int flags = 0;
-        if (mSwipeUpEnabled) {
+        if (!mSwipeUpEnabled) {
-            flags = mBackButtonVisible ? 0 : FLAG_HIDE_BACK_BUTTON;
-        } else {
             flags = FLAG_DISABLE_SWIPE_UP | FLAG_DISABLE_QUICK_SCRUB | FLAG_SHOW_OVERVIEW_BUTTON;
         }
         try {
@@ -175,6 +174,18 @@ public class OverviewInteractionState {
         }
     }
 
+    @WorkerThread
+    private void applyBackButtonAlpha(float alpha, boolean animate) {
+        if (mISystemUiProxy == null) {
+            return;
+        }
+        try {
+            mISystemUiProxy.setBackButtonAlpha(alpha, animate);
+        } catch (RemoteException e) {
+            Log.w(TAG, "Unable to update overview back button alpha", e);
+        }
+    }
+
     private class SwipeUpGestureEnabledSettingObserver extends ContentObserver {
         private Handler mHandler;
         private ContentResolver mResolver;

src/com/android/launcher3/allapps/AllAppsTransitionController.java

@@ -25,9 +25,11 @@ import com.android.launcher3.LauncherState;
 import com.android.launcher3.LauncherStateManager.AnimationConfig;
 import com.android.launcher3.LauncherStateManager.StateHandler;
 import com.android.launcher3.R;
+import com.android.launcher3.Utilities;
 import com.android.launcher3.anim.AnimationSuccessListener;
 import com.android.launcher3.anim.AnimatorSetBuilder;
 import com.android.launcher3.anim.PropertySetter;
+import com.android.launcher3.uioverrides.UiFactory;
 import com.android.launcher3.util.Themes;
 import com.android.launcher3.views.ScrimView;
 
@@ -182,6 +184,13 @@ public class AllAppsTransitionController implements StateHandler, OnDeviceProfil
         anim.setDuration(config.duration);
         anim.setInterpolator(builder.getInterpolator(ANIM_VERTICAL_PROGRESS, interpolator));
         anim.addListener(getProgressAnimatorListener());
+        if (toState.hideBackButton) {
+            anim.addUpdateListener(animation -> {
+                final float alpha = (float) animation.getAnimatedValue();
+                UiFactory.setBackButtonAlpha(mLauncher, 1 - Utilities.boundToRange(alpha, 0, 1),
+                        false /* animate */);
+            });
+        }
 
         builder.play(anim);
 

src/com/android/launcher3/touch/AbstractStateChangeTouchController.java

@@ -42,6 +42,7 @@ import com.android.launcher3.Utilities;
 import com.android.launcher3.anim.AnimationSuccessListener;
 import com.android.launcher3.anim.AnimatorPlaybackController;
 import com.android.launcher3.anim.AnimatorSetBuilder;
+import com.android.launcher3.uioverrides.UiFactory;
 import com.android.launcher3.userevent.nano.LauncherLogProto.Action.Direction;
 import com.android.launcher3.userevent.nano.LauncherLogProto.Action.Touch;
 import com.android.launcher3.userevent.nano.LauncherLogProto.ContainerType;
@@ -221,6 +222,8 @@ public abstract class AbstractStateChangeTouchController
             cancelAtomicComponentsController();
         }
         mProgressMultiplier = initCurrentAnimation(animComponents);
+        mCurrentAnimation.getAnimationPlayer().addUpdateListener(animation ->
+                setBackButtonAlphaWithProgress((float) animation.getAnimatedValue()));
         mCurrentAnimation.dispatchOnStart();
         return true;
     }
@@ -279,6 +282,7 @@ public abstract class AbstractStateChangeTouchController
             mAtomicComponentsController.setPlayFraction(fraction - mAtomicComponentsStartProgress);
         }
         maybeUpdateAtomicAnim(mFromState, mToState, fraction);
+        setBackButtonAlphaWithProgress(fraction);
     }
 
     /**
@@ -471,6 +475,14 @@ public abstract class AbstractStateChangeTouchController
         }
     }
 
+    private void setBackButtonAlphaWithProgress(float progress) {
+        if (mFromState.hideBackButton ^ mToState.hideBackButton) {
+            progress = Utilities.boundToRange(progress, 0, 1);
+            final float alpha = mToState.hideBackButton ? 1 - progress : progress;
+            UiFactory.setBackButtonAlpha(mLauncher, alpha, false /* animate */);
+        }
+    }
+
     private void logReachedState(int logAction) {
         // Transition complete. log the action
         mLauncher.getUserEventDispatcher().logStateChangeAction(logAction,

src_ui_overrides/com/android/launcher3/uioverrides/UiFactory.java

@@ -56,4 +56,6 @@ public class UiFactory {
     }
 
     public static void prepareToShowOverview(Launcher launcher) { }
+
+    public static void setBackButtonAlpha(Launcher launcher, float alpha, boolean animate) { }
 }