Defer starting the high-res thumbnail loader until quick step/scrub

- When hitting the home button, we may be loading high-res thumbnails
  unnecessarily since the high-res loader is already enabled when
  Launcher is started.

Bug: 111515602
Bug: 111156069

Change-Id: I367993b4ddf653b816355df005c745caed5e794a

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

@@ -165,6 +165,14 @@ public class UiFactory {
         }
     }
 
+    public static void onEnterAnimationComplete(Context context) {
+        // After the transition to home, enable the high-res thumbnail loader if it wasn't enabled
+        // as a part of quickstep/scrub, so that high-res thumbnails can load the next time we
+        // enter overview
+        RecentsModel.getInstance(context).getRecentsTaskLoader()
+                .getHighResThumbnailLoader().setVisible(true);
+    }
+
     public static void onLauncherStateOrResumeChanged(Launcher launcher) {
         LauncherState state = launcher.getStateManager().getState();
         DeviceProfile profile = launcher.getDeviceProfile();

quickstep/src/com/android/quickstep/RecentsModel.java

@@ -232,7 +232,6 @@ public class RecentsModel extends TaskStackChangeListener {
 
     public void onStart() {
         mRecentsTaskLoader.startLoader(mContext);
-        mRecentsTaskLoader.getHighResThumbnailLoader().setVisible(true);
     }
 
     public void onTrimMemory(int level) {

quickstep/src/com/android/quickstep/WindowTransformSwipeHandler.java

@@ -483,6 +483,12 @@ public class WindowTransformSwipeHandler<T extends BaseDraggingActivity> {
         if (LatencyTrackerCompat.isEnabled(mContext)) {
             LatencyTrackerCompat.logToggleRecents((int) (mLauncherFrameDrawnTime - mTouchTimeMs));
         }
+
+        // This method is only called when STATE_GESTURE_STARTED_QUICKSTEP/
+        // STATE_GESTURE_STARTED_QUICKSCRUB is set, so we can enable the high-res thumbnail loader
+        // here once we are sure that we will end up in an overview state
+        RecentsModel.getInstance(mContext).getRecentsTaskLoader()
+                .getHighResThumbnailLoader().setVisible(true);
     }
 
     public void updateInteractionType(@InteractionType int interactionType) {

src/com/android/launcher3/Launcher.java

@@ -347,6 +347,12 @@ public class Launcher extends BaseDraggingActivity implements LauncherExterns,
         TraceHelper.endSection("Launcher-onCreate");
     }
 
+    @Override
+    public void onEnterAnimationComplete() {
+        super.onEnterAnimationComplete();
+        UiFactory.onEnterAnimationComplete(this);
+    }
+
     @Override
     public void onConfigurationChanged(Configuration newConfig) {
         int diff = newConfig.diff(mOldConfig);

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

@@ -48,6 +48,8 @@ public class UiFactory {
 
     public static void onStart(Launcher launcher) { }
 
+    public static void onEnterAnimationComplete(Context context) {}
+
     public static void onLauncherStateOrResumeChanged(Launcher launcher) { }
 
     public static void onTrimMemory(Launcher launcher, int level) { }