Make navbar scrim taskbar background if taskbar is enabled.

This ensures the navbar buttons are visible on large screens where All
Apps or Widgets picker are bottom sheets.

Test: Scrim is taskbar background color on devices with taskbar.
Bug: 264463659
Change-Id: I37890c0f542db625f9aeae7648bbaed064c4d240

src/com/android/launcher3/allapps/ActivityAllAppsContainerView.java

@@ -184,7 +184,7 @@ public class ActivityAllAppsContainerView<T extends Context & ActivityContext>
                 this, mActivityContext.getStatsLogManager());
         mAH = Arrays.asList(null, null, null);
         mNavBarScrimPaint = new Paint();
-        mNavBarScrimPaint.setColor(Themes.getAttrColor(context, R.attr.allAppsNavBarScrimColor));
+        mNavBarScrimPaint.setColor(Themes.getNavBarScrimColor(mActivityContext));
 
         AllAppsStore.OnUpdateListener onAppsUpdated = this::onAppsUpdated;
         if (TestProtocol.sDebugTracing) {
@@ -810,6 +810,12 @@ public class ActivityAllAppsContainerView<T extends Context & ActivityContext>
             }
         }
         updateBackground(dp);
+
+        int navBarScrimColor = Themes.getNavBarScrimColor(mActivityContext);
+        if (mNavBarScrimPaint.getColor() != navBarScrimColor) {
+            mNavBarScrimPaint.setColor(navBarScrimColor);
+            invalidate();
+        }
     }
 
     protected void updateBackground(DeviceProfile deviceProfile) {

src/com/android/launcher3/util/Themes.java

@@ -32,10 +32,13 @@ import android.util.AttributeSet;
 import android.util.SparseArray;
 import android.util.TypedValue;
 
+import androidx.annotation.ColorInt;
+
 import com.android.launcher3.LauncherPrefs;
 import com.android.launcher3.R;
 import com.android.launcher3.Utilities;
 import com.android.launcher3.icons.GraphicsUtils;
+import com.android.launcher3.views.ActivityContext;
 
 /**
  * Various utility methods associated with theming.
@@ -198,4 +201,12 @@ public class Themes {
 
         return result;
     }
+
+    /** Returns the desired navigation bar scrim color depending on the {@code DeviceProfile}. */
+    @ColorInt
+    public static <T extends Context & ActivityContext> int getNavBarScrimColor(T context) {
+        return context.getDeviceProfile().isTaskbarPresent
+                ? context.getColor(R.color.taskbar_background)
+                : Themes.getAttrColor(context, R.attr.allAppsNavBarScrimColor);
+    }
 }

src/com/android/launcher3/widget/BaseWidgetSheet.java

@@ -37,6 +37,7 @@ import androidx.annotation.Px;
 import androidx.core.view.ViewCompat;
 
 import com.android.launcher3.DeviceProfile;
+import com.android.launcher3.DeviceProfile.OnDeviceProfileChangeListener;
 import com.android.launcher3.DragSource;
 import com.android.launcher3.DropTarget.DragObject;
 import com.android.launcher3.Insettable;
@@ -60,7 +61,7 @@ import com.android.launcher3.views.ArrowTipView;
  */
 public abstract class BaseWidgetSheet extends AbstractSlideInView<Launcher>
         implements OnClickListener, OnLongClickListener, DragSource,
-        PopupDataProvider.PopupDataChangeListener, Insettable {
+        PopupDataProvider.PopupDataChangeListener, Insettable, OnDeviceProfileChangeListener {
     /** The default number of cells that can fit horizontally in a widget sheet. */
     public static final int DEFAULT_MAX_HORIZONTAL_SPANS = 4;
 
@@ -84,7 +85,7 @@ public abstract class BaseWidgetSheet extends AbstractSlideInView<Launcher>
         mWidgetCellHorizontalPadding = getResources().getDimensionPixelSize(
                 R.dimen.widget_cell_horizontal_padding);
         mNavBarScrimPaint = new Paint();
-        mNavBarScrimPaint.setColor(Themes.getAttrColor(context, R.attr.allAppsNavBarScrimColor));
+        mNavBarScrimPaint.setColor(Themes.getNavBarScrimColor(mActivityContext));
     }
 
     protected int getScrimColor(Context context) {
@@ -98,12 +99,23 @@ public abstract class BaseWidgetSheet extends AbstractSlideInView<Launcher>
                 .normalizeWindowInsets(getContext(), getRootWindowInsets(), new Rect());
         mNavBarScrimHeight = getNavBarScrimHeight(windowInsets);
         mActivityContext.getPopupDataProvider().setChangeListener(this);
+        mActivityContext.addOnDeviceProfileChangeListener(this);
     }
 
     @Override
     protected void onDetachedFromWindow() {
         super.onDetachedFromWindow();
         mActivityContext.getPopupDataProvider().setChangeListener(null);
+        mActivityContext.removeOnDeviceProfileChangeListener(this);
+    }
+
+    @Override
+    public void onDeviceProfileChanged(DeviceProfile dp) {
+        int navBarScrimColor = Themes.getNavBarScrimColor(mActivityContext);
+        if (mNavBarScrimPaint.getColor() != navBarScrimColor) {
+            mNavBarScrimPaint.setColor(navBarScrimColor);
+            invalidate();
+        }
     }
 
     @Override