Merge "Sharesheet - Scrolling UI adjustments" into qt-dev

core/java/com/android/internal/app/ChooserActivity.java

@@ -480,6 +480,28 @@ public class ChooserActivity extends ResolverActivity {
             if (isSendAction(target)) {
                 mResolverDrawerLayout.setOnScrollChangeListener(this::handleScroll);
             }
+
+            final View chooserHeader = mResolverDrawerLayout.findViewById(R.id.chooser_header);
+            final float defaultElevation = chooserHeader.getElevation();
+            final float chooserHeaderScrollElevation =
+                    getResources().getDimensionPixelSize(R.dimen.chooser_header_scroll_elevation);
+
+            mAdapterView.setOnScrollListener(new AbsListView.OnScrollListener() {
+                public void onScrollStateChanged(AbsListView view, int scrollState) {
+                }
+
+                public void onScroll(AbsListView view, int firstVisibleItem, int visibleItemCount,
+                        int totalItemCount) {
+                    if (view.getChildCount() > 0) {
+                        if (firstVisibleItem > 0 || view.getChildAt(0).getTop() < 0) {
+                            chooserHeader.setElevation(chooserHeaderScrollElevation);
+                            return;
+                        }
+                    }
+
+                    chooserHeader.setElevation(defaultElevation);
+                }
+            });
         }
 
         if (DEBUG) {

core/res/res/layout/chooser_grid.xml

@@ -25,6 +25,7 @@
     android:id="@id/contentPanel">
 
     <RelativeLayout
+        android:id="@+id/chooser_header"
         android:layout_width="match_parent"
         android:layout_height="wrap_content"
         android:layout_alwaysShow="true"
@@ -62,11 +63,10 @@
         android:layout_height="match_parent"
         android:id="@+id/resolver_list"
         android:clipToPadding="false"
-        android:scrollbarStyle="outsideOverlay"
         android:background="?attr/colorBackgroundFloating"
+        android:scrollbars="none"
         android:listSelector="@color/transparent"
         android:divider="@null"
-        android:scrollIndicators="top"
         android:elevation="1dp"
         android:nestedScrollingEnabled="true"/>
 

core/res/res/values/dimens.xml

@@ -734,5 +734,6 @@
     <dimen name="resolver_icon_size">42dp</dimen>
     <dimen name="resolver_badge_size">18dp</dimen>
     <dimen name="chooser_target_width">90dp</dimen>
+    <dimen name="chooser_header_scroll_elevation">4dp</dimen>
     <dimen name="chooser_max_collapsed_height">288dp</dimen>
 </resources>

core/res/res/values/symbols.xml

@@ -2786,6 +2786,8 @@
   <java-symbol type="dimen" name="chooser_preview_image_border"/>
   <java-symbol type="dimen" name="chooser_max_collapsed_height" />
   <java-symbol type="layout" name="chooser_grid" />
+  <java-symbol type="id" name="chooser_header" />
+  <java-symbol type="dimen" name="chooser_header_scroll_elevation" />
   <java-symbol type="layout" name="chooser_grid_preview_text" />
   <java-symbol type="layout" name="chooser_grid_preview_image" />
   <java-symbol type="layout" name="chooser_grid_preview_file" />