Update vertical drag handle (all apps arrow)

- Change drawable to match specs, using ShadowDrawable to
  add shadow when necessary based on workspace theme.
- New drawable is 18dp by 6dp; add support for different
  width vs height, and decouple from workspace page
  indicator (which is still 24dp tall).

Bug: 151768994
Change-Id: Icfd0eac197ebc4d1f5bb799f8538c4bd99d800cd
diff --git a/src/com/android/launcher3/DeviceProfile.java b/src/com/android/launcher3/DeviceProfile.java
index c049069..4e1e586 100644
--- a/src/com/android/launcher3/DeviceProfile.java
+++ b/src/com/android/launcher3/DeviceProfile.java
@@ -76,9 +76,9 @@
     public float workspaceSpringLoadShrinkFactor;
     public final int workspaceSpringLoadedBottomSpace;
 
-    // Drag handle
-    public final int verticalDragHandleSizePx;
-    private final int verticalDragHandleOverlapWorkspace;
+    // Workspace page indicator
+    public final int workspacePageIndicatorHeight;
+    private final int mWorkspacePageIndicatorOverlapWorkspace;
 
     // Workspace icons
     public int iconSizePx;
@@ -190,10 +190,10 @@
             cellLayoutBottomPaddingPx = 0;
         }
 
-        verticalDragHandleSizePx = res.getDimensionPixelSize(
-                R.dimen.vertical_drag_handle_size);
-        verticalDragHandleOverlapWorkspace =
-                res.getDimensionPixelSize(R.dimen.vertical_drag_handle_overlap_workspace);
+        workspacePageIndicatorHeight = res.getDimensionPixelSize(
+                R.dimen.workspace_page_indicator_height);
+        mWorkspacePageIndicatorOverlapWorkspace =
+                res.getDimensionPixelSize(R.dimen.workspace_page_indicator_overlap_workspace);
 
         iconDrawablePaddingOriginalPx =
                 res.getDimensionPixelSize(R.dimen.dynamic_grid_icon_drawable_padding);
@@ -211,7 +211,7 @@
         hotseatBarSidePaddingEndPx =
                 res.getDimensionPixelSize(R.dimen.dynamic_grid_hotseat_side_padding);
         // Add a bit of space between nav bar and hotseat in vertical bar layout.
-        hotseatBarSidePaddingStartPx = isVerticalBarLayout() ? verticalDragHandleSizePx : 0;
+        hotseatBarSidePaddingStartPx = isVerticalBarLayout() ? workspacePageIndicatorHeight : 0;
         hotseatBarSizePx = ResourceUtils.pxFromDp(inv.iconSize, dm) + (isVerticalBarLayout()
                 ? (hotseatBarSidePaddingStartPx + hotseatBarSidePaddingEndPx)
                 : (res.getDimensionPixelSize(R.dimen.dynamic_grid_hotseat_extra_vertical_size)
@@ -227,7 +227,7 @@
             // in portrait mode closer together by adding more height to the hotseat.
             // Note: This calculation was created after noticing a pattern in the design spec.
             int extraSpace = getCellSize().y - iconSizePx - iconDrawablePaddingPx * 2
-                    - verticalDragHandleSizePx;
+                    - workspacePageIndicatorHeight;
             hotseatBarSizePx += extraSpace;
             hotseatBarBottomPaddingPx += extraSpace;
 
@@ -376,7 +376,7 @@
 
         if (!isVerticalLayout) {
             int expectedWorkspaceHeight = availableHeightPx - hotseatBarSizePx
-                    - verticalDragHandleSizePx - edgeMarginPx;
+                    - workspacePageIndicatorHeight - edgeMarginPx;
             float minRequiredHeight = dropTargetBarSizePx + workspaceSpringLoadedBottomSpace;
             workspaceSpringLoadShrinkFactor = Math.min(
                     res.getInteger(R.integer.config_workspaceSpringLoadShrinkPercentage) / 100.0f,
@@ -480,14 +480,14 @@
             padding.bottom = edgeMarginPx;
             if (isSeascape()) {
                 padding.left = hotseatBarSizePx;
-                padding.right = verticalDragHandleSizePx;
+                padding.right = hotseatBarSidePaddingStartPx;
             } else {
-                padding.left = verticalDragHandleSizePx;
+                padding.left = hotseatBarSidePaddingStartPx;
                 padding.right = hotseatBarSizePx;
             }
         } else {
-            int paddingBottom = hotseatBarSizePx + verticalDragHandleSizePx
-                    - verticalDragHandleOverlapWorkspace;
+            int paddingBottom = hotseatBarSizePx + workspacePageIndicatorHeight
+                    - mWorkspacePageIndicatorOverlapWorkspace;
             if (isTablet) {
                 // Pad the left and right of the workspace to ensure consistent spacing
                 // between all icons
@@ -554,7 +554,7 @@
                     mInsets.top + dropTargetBarSizePx + edgeMarginPx,
                     mInsets.left + availableWidthPx - edgeMarginPx,
                     mInsets.top + availableHeightPx - hotseatBarSizePx
-                            - verticalDragHandleSizePx - edgeMarginPx);
+                            - workspacePageIndicatorHeight - edgeMarginPx);
         }
     }
 
diff --git a/src/com/android/launcher3/allapps/AllAppsTransitionController.java b/src/com/android/launcher3/allapps/AllAppsTransitionController.java
index 7600f52..00128eb 100644
--- a/src/com/android/launcher3/allapps/AllAppsTransitionController.java
+++ b/src/com/android/launcher3/allapps/AllAppsTransitionController.java
@@ -123,8 +123,8 @@
 
         // Use a light system UI (dark icons) if all apps is behind at least half of the
         // status bar.
-        boolean forceChange = shiftCurrent - mScrimView.getDragHandleSize()
-                <= mLauncher.getDeviceProfile().getInsets().top / 2;
+        boolean forceChange = Math.min(shiftCurrent, mScrimView.getVisualTop())
+                <= mLauncher.getDeviceProfile().getInsets().top / 2f;
         if (forceChange) {
             mLauncher.getSystemUiController().updateUiState(UI_STATE_ALL_APPS, !mIsDarkTheme);
         } else {
diff --git a/src/com/android/launcher3/pageindicators/WorkspacePageIndicator.java b/src/com/android/launcher3/pageindicators/WorkspacePageIndicator.java
index 0f2ca72..408796f 100644
--- a/src/com/android/launcher3/pageindicators/WorkspacePageIndicator.java
+++ b/src/com/android/launcher3/pageindicators/WorkspacePageIndicator.java
@@ -121,7 +121,7 @@
         mLinePaint.setAlpha(0);
 
         mLauncher = Launcher.getLauncher(context);
-        mLineHeight = res.getDimensionPixelSize(R.dimen.dynamic_grid_page_indicator_line_height);
+        mLineHeight = res.getDimensionPixelSize(R.dimen.workspace_page_indicator_line_height);
 
         boolean darkText = WallpaperColorInfo.INSTANCE.get(context).supportsDarkText();
         mActiveAlpha = darkText ? BLACK_ALPHA : WHITE_ALPHA;
diff --git a/src/com/android/launcher3/views/ScrimView.java b/src/com/android/launcher3/views/ScrimView.java
index 6d204f6..adad097 100644
--- a/src/com/android/launcher3/views/ScrimView.java
+++ b/src/com/android/launcher3/views/ScrimView.java
@@ -33,8 +33,10 @@
 import android.animation.PropertyValuesHolder;
 import android.animation.RectEvaluator;
 import android.content.Context;
+import android.content.res.Resources;
 import android.graphics.Canvas;
 import android.graphics.Color;
+import android.graphics.Point;
 import android.graphics.Rect;
 import android.graphics.RectF;
 import android.graphics.drawable.Drawable;
@@ -115,7 +117,9 @@
     protected int mEndFlatColor;
     protected int mEndFlatColorAlpha;
 
-    protected final int mDragHandleSize;
+    protected final Point mDragHandleSize;
+    private final int mDragHandleTouchSize;
+    private final int mDragHandlePaddingInVerticalBarLayout;
     protected float mDragHandleOffset;
     private final Rect mDragHandleBounds;
     private final RectF mHitRect = new RectF();
@@ -136,9 +140,13 @@
 
         mMaxScrimAlpha = 0.7f;
 
-        mDragHandleSize = context.getResources()
-                .getDimensionPixelSize(R.dimen.vertical_drag_handle_size);
-        mDragHandleBounds = new Rect(0, 0, mDragHandleSize, mDragHandleSize);
+        Resources res = context.getResources();
+        mDragHandleSize = new Point(res.getDimensionPixelSize(R.dimen.vertical_drag_handle_width),
+                res.getDimensionPixelSize(R.dimen.vertical_drag_handle_height));
+        mDragHandleBounds = new Rect(0, 0, mDragHandleSize.x, mDragHandleSize.y);
+        mDragHandleTouchSize = res.getDimensionPixelSize(R.dimen.vertical_drag_handle_touch_size);
+        mDragHandlePaddingInVerticalBarLayout = context.getResources()
+                .getDimensionPixelSize(R.dimen.vertical_drag_handle_padding_in_vertical_bar_layout);
 
         mAccessibilityHelper = createAccessibilityHelper();
         ViewCompat.setAccessibilityDelegate(this, mAccessibilityHelper);
@@ -297,24 +305,26 @@
         DeviceProfile grid = mLauncher.getDeviceProfile();
         final int left;
         final int width = getMeasuredWidth();
-        final int top = getMeasuredHeight() - mDragHandleSize - grid.getInsets().bottom;
+        final int top = getMeasuredHeight() - mDragHandleSize.y - grid.getInsets().bottom;
         final int topMargin;
 
         if (grid.isVerticalBarLayout()) {
-            topMargin = grid.workspacePadding.bottom;
+            topMargin = grid.workspacePadding.bottom + mDragHandlePaddingInVerticalBarLayout;
             if (grid.isSeascape()) {
-                left = width - grid.getInsets().right - mDragHandleSize;
+                left = width - grid.getInsets().right - mDragHandleSize.x
+                        - mDragHandlePaddingInVerticalBarLayout;
             } else {
-                left = mDragHandleSize + grid.getInsets().left;
+                left = grid.getInsets().left + mDragHandlePaddingInVerticalBarLayout;
             }
         } else {
-            left = (width - mDragHandleSize) / 2;
+            left = Math.round((width - mDragHandleSize.x) / 2f);
             topMargin = grid.hotseatBarSizePx;
         }
         mDragHandleBounds.offsetTo(left, top - topMargin);
         mHitRect.set(mDragHandleBounds);
-        float inset = -mDragHandleSize / 2;
-        mHitRect.inset(inset, inset);
+        // Inset outwards to increase touch size.
+        mHitRect.inset((mDragHandleSize.x - mDragHandleTouchSize) / 2f,
+                (mDragHandleSize.y - mDragHandleTouchSize) / 2f);
 
         if (mDragHandle != null) {
             mDragHandle.setBounds(mDragHandleBounds);
@@ -341,7 +351,7 @@
         if (visible != wasVisible) {
             if (visible) {
                 mDragHandle = recycle != null ? recycle :
-                        mLauncher.getDrawable(R.drawable.drag_handle_indicator);
+                        mLauncher.getDrawable(R.drawable.drag_handle_indicator_shadow);
                 mDragHandle.setBounds(mDragHandleBounds);
 
                 updateDragHandleAlpha();
@@ -397,7 +407,7 @@
 
         @Override
         protected int getVirtualViewAt(float x, float y) {
-            return  mDragHandleBounds.contains((int) x, (int) y)
+            return  mHitRect.contains((int) x, (int) y)
                     ? DRAG_HANDLE_ID : INVALID_ID;
         }
 
@@ -470,7 +480,10 @@
         }
     }
 
-    public int getDragHandleSize() {
-        return mDragHandleSize;
+    /**
+     * @return The top of this scrim view, or {@link Float#MAX_VALUE} if there's no distinct top.
+     */
+    public float getVisualTop() {
+        return Float.MAX_VALUE;
     }
 }