Update folder leave-behind color for taskbar

Test: open folder in light theme and dark theme
Fixes: 265828742
Change-Id: Ib544ab85dad16c203917ae02f924650e8a5bbc6f

quickstep/src/com/android/launcher3/taskbar/TaskbarView.java

@@ -48,6 +48,7 @@ import com.android.launcher3.model.data.ItemInfo;
 import com.android.launcher3.model.data.WorkspaceItemInfo;
 import com.android.launcher3.util.DisplayController;
 import com.android.launcher3.util.LauncherBindableItemsContainer;
+import com.android.launcher3.util.Themes;
 import com.android.launcher3.views.ActivityContext;
 import com.android.launcher3.views.DoubleShadowBubbleTextView;
 import com.android.launcher3.views.IconButtonView;
@@ -70,6 +71,7 @@ public class TaskbarView extends FrameLayout implements FolderIcon.FolderIconPar
     private final int mIconTouchSize;
     private final int mItemMarginLeftRight;
     private final int mItemPadding;
+    private final int mFolderLeaveBehindColor;
     private final boolean mIsRtl;
 
     private final TaskbarActivityContext mActivityContext;
@@ -136,6 +138,9 @@ public class TaskbarView extends FrameLayout implements FolderIcon.FolderIconPar
         mItemMarginLeftRight = actualMargin - (mIconTouchSize - actualIconSize) / 2;
         mItemPadding = (mIconTouchSize - actualIconSize) / 2;
 
+        mFolderLeaveBehindColor = Themes.getAttrColor(mActivityContext,
+                android.R.attr.textColorTertiary);
+
         // Needed to draw folder leave-behind when opening one.
         setWillNotDraw(false);
 
@@ -547,7 +552,8 @@ public class TaskbarView extends FrameLayout implements FolderIcon.FolderIconPar
         if (mLeaveBehindFolderIcon != null) {
             canvas.save();
             canvas.translate(mLeaveBehindFolderIcon.getLeft(), mLeaveBehindFolderIcon.getTop());
-            mLeaveBehindFolderIcon.getFolderBackground().drawLeaveBehind(canvas);
+            mLeaveBehindFolderIcon.getFolderBackground().drawLeaveBehind(canvas,
+                    mFolderLeaveBehindColor);
             canvas.restore();
         }
     }

src/com/android/launcher3/CellLayout.java

@@ -92,6 +92,9 @@ public class CellLayout extends ViewGroup {
     private static final String TAG = "CellLayout";
     private static final boolean LOGD = false;
 
+    /** The color of the "leave-behind" shape when a folder is opened from Hotseat. */
+    private static final int FOLDER_LEAVE_BEHIND_COLOR = Color.argb(160, 245, 245, 245);
+
     protected final ActivityContext mActivity;
     @ViewDebug.ExportedProperty(category = "launcher")
     @Thunk int mCellWidth;
@@ -528,7 +531,7 @@ public class CellLayout extends ViewGroup {
                     mFolderLeaveBehind.mDelegateCellY, mTempLocation);
             canvas.save();
             canvas.translate(mTempLocation[0], mTempLocation[1]);
-            mFolderLeaveBehind.drawLeaveBehind(canvas);
+            mFolderLeaveBehind.drawLeaveBehind(canvas, FOLDER_LEAVE_BEHIND_COLOR);
             canvas.restore();
         }
 

src/com/android/launcher3/folder/PreviewBackground.java

@@ -333,12 +333,15 @@ public class PreviewBackground extends CellLayout.DelegatedCellDrawing {
                 getOffsetX() + inset, getOffsetY() + inset, getScaledRadius() - inset, mPaint);
     }
 
-    public void drawLeaveBehind(Canvas canvas) {
+    /**
+     * Draws the leave-behind circle on the given canvas and in the given color.
+     */
+    public void drawLeaveBehind(Canvas canvas, int color) {
         float originalScale = mScale;
         mScale = 0.5f;
 
         mPaint.setStyle(Paint.Style.FILL);
-        mPaint.setColor(Color.argb(160, 245, 245, 245));
+        mPaint.setColor(color);
         getShape().drawShape(canvas, getOffsetX(), getOffsetY(), getScaledRadius(), mPaint);
 
         mScale = originalScale;