Changing RecentsView layout based on the split screen task size

Bug: 155816922
Change-Id: I33f69d72f8a27e3621d029c6ee4045c3664f3ac9

quickstep/src/com/android/quickstep/util/RecentsOrientedState.java

@@ -51,6 +51,7 @@ import com.android.launcher3.DeviceProfile;
 import com.android.launcher3.Utilities;
 import com.android.launcher3.testing.TestProtocol;
 import com.android.launcher3.touch.PagedOrientationHandler;
+import com.android.launcher3.util.WindowBounds;
 
 import java.lang.annotation.Retention;
 import java.util.function.IntConsumer;
@@ -361,7 +362,8 @@ public final class RecentsOrientedState implements SharedPreferences.OnSharedPre
         float fullHeight = dp.heightPx - insets.top - insets.bottom;
 
         if (dp.isMultiWindowMode) {
-            mSizeStrategy.getMultiWindowSize(mContext, dp, outPivot);
+            WindowBounds bounds = SplitScreenBounds.INSTANCE.getSecondaryWindowBounds(mContext);
+            outPivot.set(bounds.availableSize.x, bounds.availableSize.y);
         } else {
             outPivot.set(fullWidth, fullHeight);
         }

quickstep/src/com/android/quickstep/util/SplitScreenBounds.java

@@ -0,0 +1,112 @@
+/*
+ * Copyright (C) 2020 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.quickstep.util;
+
+import static android.view.Surface.ROTATION_0;
+import static android.view.Surface.ROTATION_180;
+
+import android.annotation.TargetApi;
+import android.content.Context;
+import android.graphics.Insets;
+import android.graphics.Rect;
+import android.os.Build;
+import android.view.WindowInsets.Type;
+import android.view.WindowManager;
+import android.view.WindowMetrics;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+import androidx.annotation.UiThread;
+
+import com.android.launcher3.R;
+import com.android.launcher3.util.DefaultDisplay;
+import com.android.launcher3.util.WindowBounds;
+
+import java.util.ArrayList;
+
+/**
+ * Utility class to hold the information abound a window bounds for split screen
+ */
+@TargetApi(Build.VERSION_CODES.R)
+public class SplitScreenBounds {
+
+    public static final SplitScreenBounds INSTANCE = new SplitScreenBounds();
+    private final ArrayList<OnChangeListener> mListeners = new ArrayList<>();
+
+    @Nullable
+    private WindowBounds mBounds;
+
+    private SplitScreenBounds() { }
+
+    @UiThread
+    public void setSecondaryWindowBounds(@NonNull WindowBounds bounds) {
+        if (!bounds.equals(mBounds)) {
+            mBounds = bounds;
+            for (OnChangeListener listener : mListeners) {
+                listener.onSecondaryWindowBoundsChanged();
+            }
+        }
+    }
+
+    public @NonNull WindowBounds getSecondaryWindowBounds(Context context) {
+        if (mBounds == null) {
+            mBounds = createDefaultWindowBounds(context);
+        }
+        return mBounds;
+    }
+
+    /**
+     * Creates window bounds as 50% of device size
+     */
+    private static WindowBounds createDefaultWindowBounds(Context context) {
+        WindowMetrics wm = context.getSystemService(WindowManager.class).getMaximumWindowMetrics();
+        Insets insets = wm.getWindowInsets().getInsets(Type.systemBars());
+
+        WindowBounds bounds = new WindowBounds(wm.getBounds(),
+                new Rect(insets.left, insets.top, insets.right, insets.bottom));
+        int rotation = DefaultDisplay.INSTANCE.get(context).getInfo().rotation;
+        int halfDividerSize = context.getResources()
+                .getDimensionPixelSize(R.dimen.multi_window_task_divider_size) / 2;
+
+        if (rotation == ROTATION_0 || rotation == ROTATION_180) {
+            bounds.bounds.top = bounds.insets.top + bounds.availableSize.y / 2 + halfDividerSize;
+            bounds.insets.top = 0;
+        } else {
+            bounds.bounds.left = bounds.insets.left + bounds.availableSize.x / 2 + halfDividerSize;
+            bounds.insets.left = 0;
+        }
+        return new WindowBounds(bounds.bounds, bounds.insets);
+    }
+
+    public void addOnChangeListener(OnChangeListener listener) {
+        mListeners.add(listener);
+    }
+
+    public void removeOnChangeListener(OnChangeListener listener) {
+        mListeners.remove(listener);
+    }
+
+    /**
+     * Interface to receive window bounds changes
+     */
+    public interface OnChangeListener {
+
+        /**
+         * Called when window bounds for secondary window changes
+         */
+        void onSecondaryWindowBoundsChanged();
+    }
+}

quickstep/src/com/android/quickstep/util/WindowSizeStrategy.java

@@ -20,13 +20,15 @@ import static com.android.quickstep.SysUINavigationMode.getMode;
 import static com.android.quickstep.SysUINavigationMode.removeShelfFromOverview;
 import static com.android.quickstep.util.LayoutUtils.getDefaultSwipeHeight;
 
+import android.annotation.TargetApi;
 import android.content.Context;
 import android.content.res.Resources;
-import android.graphics.PointF;
 import android.graphics.Rect;
+import android.os.Build;
 
 import com.android.launcher3.DeviceProfile;
 import com.android.launcher3.R;
+import com.android.launcher3.util.WindowBounds;
 import com.android.quickstep.SysUINavigationMode.Mode;
 
 /**
@@ -34,20 +36,15 @@ import com.android.quickstep.SysUINavigationMode.Mode;
  * TODO: Merge is with {@link com.android.quickstep.BaseActivityInterface} once we remove the
  * state dependent members from {@link com.android.quickstep.LauncherActivityInterface}
  */
+@TargetApi(Build.VERSION_CODES.R)
 public abstract class WindowSizeStrategy {
 
-    private final PointF mTempPoint = new PointF();
     public final boolean rotationSupportedByActivity;
 
     private WindowSizeStrategy(boolean rotationSupportedByActivity) {
         this.rotationSupportedByActivity = rotationSupportedByActivity;
     }
 
-    /**
-     * Sets the expected window size in multi-window mode
-     */
-    public abstract void getMultiWindowSize(Context context, DeviceProfile dp, PointF out);
-
     /**
      * Calculates the taskView size for the provided device configuration
      */
@@ -65,9 +62,9 @@ public abstract class WindowSizeStrategy {
         final boolean showLargeTaskSize = showOverviewActions(context);
 
         if (dp.isMultiWindowMode) {
-            getMultiWindowSize(context, dp, mTempPoint);
-            taskWidth = mTempPoint.x;
-            taskHeight = mTempPoint.y;
+            WindowBounds bounds = SplitScreenBounds.INSTANCE.getSecondaryWindowBounds(context);
+            taskWidth = bounds.availableSize.x;
+            taskHeight = bounds.availableSize.y;
             paddingHorz = res.getDimension(R.dimen.multi_window_task_card_horz_space);
         } else {
             taskWidth = dp.availableWidthPx;
@@ -113,22 +110,6 @@ public abstract class WindowSizeStrategy {
     public static final WindowSizeStrategy LAUNCHER_ACTIVITY_SIZE_STRATEGY =
             new WindowSizeStrategy(true) {
 
-        @Override
-        public void getMultiWindowSize(Context context, DeviceProfile dp, PointF out) {
-            DeviceProfile fullDp = dp.getFullScreenProfile();
-            // Use availableWidthPx and availableHeightPx instead of widthPx and heightPx to
-            // account for system insets
-            out.set(fullDp.availableWidthPx, fullDp.availableHeightPx);
-            float halfDividerSize = context.getResources()
-                    .getDimension(R.dimen.multi_window_task_divider_size) / 2;
-
-            if (fullDp.isLandscape) {
-                out.x = out.x / 2 - halfDividerSize;
-            } else {
-                out.y = out.y / 2 - halfDividerSize;
-            }
-        }
-
         @Override
         float getExtraSpace(Context context, DeviceProfile dp) {
             if (dp.isVerticalBarLayout()) {
@@ -164,10 +145,6 @@ public abstract class WindowSizeStrategy {
 
     public static final WindowSizeStrategy FALLBACK_RECENTS_SIZE_STRATEGY =
             new WindowSizeStrategy(false) {
-        @Override
-        public void getMultiWindowSize(Context context, DeviceProfile dp, PointF out) {
-            out.set(dp.widthPx, dp.heightPx);
-        }
 
         @Override
         float getExtraSpace(Context context, DeviceProfile dp) {