Support split from fullscreen with shortcuts

Recording: https://recall.googleplex.com/projects/f46cfe9c-8076-4efe-bf8a-b1cc4f1f5e1b/sessions/978a3a55-2982-4026-9726-2a73cb694258

TODO: improve transition animation

Bug: 246661484
Test: manual
Change-Id: Id0d1aec0685bc18f4b273f8e466996efc1d9a3d8
Merged-In: Id0d1aec0685bc18f4b273f8e466996efc1d9a3d8
diff --git a/src/com/android/launcher3/Launcher.java b/src/com/android/launcher3/Launcher.java
index 7269d14..b7e55b4 100644
--- a/src/com/android/launcher3/Launcher.java
+++ b/src/com/android/launcher3/Launcher.java
@@ -1331,7 +1331,7 @@
         BubbleTextView favorite = (BubbleTextView) LayoutInflater.from(parent.getContext())
                 .inflate(R.layout.app_icon, parent, false);
         favorite.applyFromWorkspaceItem(info);
-        favorite.setOnClickListener(ItemClickHandler.INSTANCE);
+        favorite.setOnClickListener(getItemOnClickListener());
         favorite.setOnFocusChangeListener(mFocusHandler);
         return favorite;
     }
diff --git a/src/com/android/launcher3/config/FeatureFlags.java b/src/com/android/launcher3/config/FeatureFlags.java
index 037a77e..694536c 100644
--- a/src/com/android/launcher3/config/FeatureFlags.java
+++ b/src/com/android/launcher3/config/FeatureFlags.java
@@ -253,6 +253,10 @@
             "ENABLE_SPLIT_FROM_WORKSPACE", true,
             "Enable initiating split screen from workspace.");
 
+    public static final BooleanFlag ENABLE_SPLIT_FROM_FULLSCREEN_WITH_KEYBOARD_SHORTCUTS =
+            getDebugFlag("ENABLE_SPLIT_FROM_FULLSCREEN_SHORTCUT", false,
+                    "Enable splitting from fullscreen app with keyboard shortcuts");
+
     public static final BooleanFlag ENABLE_NEW_MIGRATION_LOGIC = getDebugFlag(
             "ENABLE_NEW_MIGRATION_LOGIC", true,
             "Enable the new grid migration logic, keeping pages when src < dest");
diff --git a/src/com/android/launcher3/logging/StatsLogManager.java b/src/com/android/launcher3/logging/StatsLogManager.java
index 05f53fd..06ba556 100644
--- a/src/com/android/launcher3/logging/StatsLogManager.java
+++ b/src/com/android/launcher3/logging/StatsLogManager.java
@@ -617,6 +617,11 @@
         @UiEvent(doc = "Number of apps in A-Z list (personal and work profile)")
         LAUNCHER_ALLAPPS_COUNT(1225),
 
+        @UiEvent(doc = "User has invoked split to right half with a keyboard shortcut.")
+        LAUNCHER_KEYBOARD_SHORTCUT_SPLIT_RIGHT_BOTTOM(1232),
+
+        @UiEvent(doc = "User has invoked split to left half with a keyboard shortcut.")
+        LAUNCHER_KEYBOARD_SHORTCUT_SPLIT_LEFT_TOP(1233)
         ;
 
         // ADD MORE
diff --git a/src/com/android/launcher3/statemanager/StatefulActivity.java b/src/com/android/launcher3/statemanager/StatefulActivity.java
index 2a890c3..520f33c 100644
--- a/src/com/android/launcher3/statemanager/StatefulActivity.java
+++ b/src/com/android/launcher3/statemanager/StatefulActivity.java
@@ -231,4 +231,10 @@
      * etc.)
      */
     protected abstract void onHandleConfigurationChanged();
+
+    /**
+     * Enter staged split directly from the current running app.
+     * @param leftOrTop if the staged split will be positioned left or top.
+     */
+    public void enterStageSplitFromRunningApp(boolean leftOrTop) { }
 }
diff --git a/src/com/android/launcher3/util/SplitConfigurationOptions.java b/src/com/android/launcher3/util/SplitConfigurationOptions.java
index 3eff783..19a3948 100644
--- a/src/com/android/launcher3/util/SplitConfigurationOptions.java
+++ b/src/com/android/launcher3/util/SplitConfigurationOptions.java
@@ -182,4 +182,12 @@
                 ? LAUNCHER_APP_ICON_MENU_SPLIT_LEFT_TOP
                 : LAUNCHER_APP_ICON_MENU_SPLIT_RIGHT_BOTTOM;
     }
+
+    public static @StagePosition int getOppositeStagePosition(@StagePosition int position) {
+        if (position == STAGE_POSITION_UNDEFINED) {
+            return position;
+        }
+        return position == STAGE_POSITION_TOP_OR_LEFT ? STAGE_POSITION_BOTTOM_OR_RIGHT
+                : STAGE_POSITION_TOP_OR_LEFT;
+    }
 }