sysui: show a drag handler when QS is collapsed in split shade

Fixes: 187489358
Test: manual testing
Change-Id: I287f9cc1954b92f2bca4a4c95ffe3829c0ddafd3

packages/SystemUI/res/drawable/ic_qs_drag_handle.xml

@@ -0,0 +1,24 @@
+<!--
+  ~ Copyright (C) 2021 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
+  -->
+<vector xmlns:android="http://schemas.android.com/apk/res/android"
+    android:width="36dp"
+    android:height="24dp"
+    android:viewportWidth="24.0"
+    android:viewportHeight="24.0">
+    <path
+        android:fillColor="?android:attr/textColorPrimary"
+        android:pathData="M5.41,7.59L4,9l8,8 8,-8 -1.41,-1.41L12,14.17" />
+</vector>

packages/SystemUI/res/layout/qs_panel.xml

@@ -13,13 +13,13 @@
      See the License for the specific language governing permissions and
      limitations under the License.
 -->
-<com.android.systemui.qs.QSContainerImpl
-    xmlns:android="http://schemas.android.com/apk/res/android"
+<com.android.systemui.qs.QSContainerImpl xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:tools="http://schemas.android.com/tools"
     android:id="@+id/quick_settings_container"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
     android:clipToPadding="false"
-    android:clipChildren="false" >
+    android:clipChildren="false">
 
     <com.android.systemui.qs.NonInterceptingScrollView
         android:id="@+id/expanded_qs_scroll_view"
@@ -40,15 +40,33 @@
             android:accessibilityTraversalBefore="@android:id/edit"
             android:clipToPadding="false"
             android:clipChildren="false">
+
             <include layout="@layout/qs_footer_impl" />
         </com.android.systemui.qs.QSPanel>
     </com.android.systemui.qs.NonInterceptingScrollView>
 
     <include layout="@layout/quick_status_bar_expanded_header" />
 
-    <include android:id="@+id/qs_detail" layout="@layout/qs_detail" />
+    <include
+        android:id="@+id/qs_detail"
+        layout="@layout/qs_detail" />
 
-    <include android:id="@+id/qs_customize" layout="@layout/qs_customize_panel"
+    <include
+        android:id="@+id/qs_customize"
+        layout="@layout/qs_customize_panel"
         android:visibility="gone" />
 
+    <ImageView
+        android:id="@+id/qs_drag_handle"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_gravity="center_horizontal"
+        android:layout_marginTop="24dp"
+        android:elevation="4dp"
+        android:importantForAccessibility="no"
+        android:scaleType="center"
+        android:src="@drawable/ic_qs_drag_handle"
+        android:tint="@color/qs_detail_button_white"
+        tools:ignore="UseAppTint" />
+
 </com.android.systemui.qs.QSContainerImpl>

packages/SystemUI/src/com/android/systemui/qs/QSContainerImpl.java

@@ -27,6 +27,7 @@ import android.util.AttributeSet;
 import android.view.View;
 import android.view.WindowInsets;
 import android.widget.FrameLayout;
+import android.widget.ImageView;
 
 import com.android.systemui.R;
 import com.android.systemui.qs.customize.QSCustomizer;
@@ -47,6 +48,7 @@ public class QSContainerImpl extends FrameLayout {
     private float mQsExpansion;
     private QSCustomizer mQSCustomizer;
     private NonInterceptingScrollView mQSPanelContainer;
+    private ImageView mDragHandle;
 
     private int mSideMargins;
     private boolean mQsDisabled;
@@ -65,6 +67,7 @@ public class QSContainerImpl extends FrameLayout {
         mQSDetail = findViewById(R.id.qs_detail);
         mHeader = findViewById(R.id.header);
         mQSCustomizer = findViewById(R.id.qs_customize);
+        mDragHandle = findViewById(R.id.qs_drag_handle);
         setImportantForAccessibility(IMPORTANT_FOR_ACCESSIBILITY_NO);
     }
 
@@ -195,6 +198,8 @@ public class QSContainerImpl extends FrameLayout {
         mQSDetail.setBottom(getTop() + scrollBottom);
         int qsDetailBottomMargin = ((MarginLayoutParams) mQSDetail.getLayoutParams()).bottomMargin;
         mQSDetail.setBottom(getTop() + scrollBottom - qsDetailBottomMargin);
+        // Pin the drag handle to the bottom of the panel.
+        mDragHandle.setTranslationY(scrollBottom - mDragHandle.getHeight());
     }
 
     protected int calculateContainerHeight() {
@@ -216,6 +221,7 @@ public class QSContainerImpl extends FrameLayout {
     public void setExpansion(float expansion) {
         mQsExpansion = expansion;
         mQSPanelContainer.setScrollingEnabled(expansion > 0f);
+        mDragHandle.setAlpha(1.0f - expansion);
         updateExpansion();
     }
 

packages/SystemUI/src/com/android/systemui/qs/QSFragment.java

@@ -32,6 +32,7 @@ import android.view.View.OnClickListener;
 import android.view.ViewGroup;
 import android.view.ViewTreeObserver;
 import android.widget.FrameLayout.LayoutParams;
+import android.widget.ImageView;
 
 import androidx.annotation.Nullable;
 import androidx.annotation.VisibleForTesting;
@@ -86,6 +87,7 @@ public class QSFragment extends LifecycleFragment implements QS, CommandQueue.Ca
     private QSFooter mFooter;
     private float mLastQSExpansion = -1;
     private boolean mQsDisabled;
+    private ImageView mQsDragHandler;
 
     private final RemoteInputQuickSettingsDisabler mRemoteInputQuickSettingsDisabler;
     private final InjectionInflationController mInjectionInflater;
@@ -187,6 +189,7 @@ public class QSFragment extends LifecycleFragment implements QS, CommandQueue.Ca
         mHeader = view.findViewById(R.id.header);
         mQSPanelController.setHeaderContainer(view.findViewById(R.id.header_text_container));
         mFooter = qsFragmentComponent.getQSFooter();
+        mQsDragHandler = view.findViewById(R.id.qs_drag_handle);
 
         mQsDetailDisplayer.setQsPanelController(mQSPanelController);
 
@@ -291,6 +294,7 @@ public class QSFragment extends LifecycleFragment implements QS, CommandQueue.Ca
                 mQSAnimator.onRtlChanged();
             }
         }
+        updateQsState();
     }
 
     @Override
@@ -363,15 +367,19 @@ public class QSFragment extends LifecycleFragment implements QS, CommandQueue.Ca
                 : View.INVISIBLE);
         mHeader.setExpanded((keyguardShowing && !mHeaderAnimating && !mShowCollapsedOnKeyguard)
                 || (mQsExpanded && !mStackScrollerOverscrolling), mQuickQSPanelController);
-        mFooter.setVisibility(
-                !mQsDisabled && (mQsExpanded || !keyguardShowing || mHeaderAnimating
-                        || mShowCollapsedOnKeyguard)
+        mFooter.setVisibility(!mQsDisabled && (mQsExpanded || !keyguardShowing || mHeaderAnimating
+                || mShowCollapsedOnKeyguard)
                 ? View.VISIBLE
                 : View.INVISIBLE);
         mFooter.setExpanded((keyguardShowing && !mHeaderAnimating && !mShowCollapsedOnKeyguard)
                 || (mQsExpanded && !mStackScrollerOverscrolling));
         mQSPanelController.setVisibility(
                 !mQsDisabled && expandVisually ? View.VISIBLE : View.INVISIBLE);
+        mQsDragHandler.setVisibility((mQsExpanded || !keyguardShowing || mHeaderAnimating
+                || mShowCollapsedOnKeyguard)
+                && Utils.shouldUseSplitNotificationShade(mFeatureFlags, getResources())
+                ? View.VISIBLE
+                : View.GONE);
     }
 
     private boolean isKeyguardState() {