Fixing the dynamic positioning (move with anchor) for the app launcher

ash/wm/app_list_controller.cc

Index: ash/wm/app_list_controller.cc
diff --git a/ash/wm/app_list_controller.cc b/ash/wm/app_list_controller.cc
index b142288ab9b1d974df150677891d8ce67086808e..f05cdfc63683c4798fb3562162394162fa80f632 100644
--- a/ash/wm/app_list_controller.cc
+++ b/ash/wm/app_list_controller.cc
@@ -38,11 +38,6 @@ const int kAnimationOffset = 8;
 // The maximum shift in pixels when over-scroll happens.
 const int kMaxOverScrollShift = 48;
 
-// The alternate shelf style adjusts the bubble to be flush with the shelf
-// when there is no bubble-tip. This is the tip height which needs to be
-// offsetted.
-const int kArrowTipHeight = 10;
-
 // The minimal anchor position offset to make sure that the bubble is still on
 // the screen with 8 pixels spacing on the left / right. This constant is a
 // result of minimal bubble arrow sizes and offsets.
@@ -87,9 +82,9 @@ gfx::Rect OffsetTowardsShelf(const gfx::Rect& rect, views::Widget* widget) {
   return offseted;
 }
 
-// Using |button_bounds|, determine the anchor so that the bubble gets shown
-// above the shelf (used for the alternate shelf theme).
-gfx::Point GetAdjustAnchorPositionToShelf(
+// Using |button_bounds|, determine the anchor offset so that the bubble gets
+// shown above the shelf (used for the alternate shelf theme).
+gfx::Vector2d GetAnchorPositionOffsetToShelf(
     const gfx::Rect& button_bounds, views::Widget* widget) {
   DCHECK(Shell::HasInstance());
   ShelfAlignment shelf_alignment = Shell::GetInstance()->GetShelfAlignment(
@@ -98,31 +93,24 @@ gfx::Point GetAdjustAnchorPositionToShelf(
   switch (shelf_alignment) {
     case SHELF_ALIGNMENT_TOP:
     case SHELF_ALIGNMENT_BOTTOM:
-      {
-        if (base::i18n::IsRTL()) {
-          int screen_width = widget->GetWorkAreaBoundsInScreen().width();
-          anchor.set_x(std::min(screen_width - kMinimalAnchorPositionOffset,
-                                anchor.x()));
-        } else {
-          anchor.set_x(std::max(kMinimalAnchorPositionOffset, anchor.x()));
-        }
-        int offset = button_bounds.height() / 2 - kArrowTipHeight;
-        if (shelf_alignment == SHELF_ALIGNMENT_TOP)
-          offset = -offset;
-        anchor.set_y(anchor.y() - offset);
+      if (base::i18n::IsRTL()) {
+        int screen_width = widget->GetWorkAreaBoundsInScreen().width();
+        return gfx::Vector2d(
+            std::min(screen_width - kMinimalAnchorPositionOffset - anchor.x(),
+                     0), 0);
       }
-      break;
+      return gfx::Vector2d(
+          std::max(kMinimalAnchorPositionOffset - anchor.x(), 0), 0);
     case SHELF_ALIGNMENT_LEFT:
-      anchor.set_x(button_bounds.right() - kArrowTipHeight);
-      anchor.set_y(std::max(kMinimalAnchorPositionOffset, anchor.y()));
-      break;
+      return gfx::Vector2d(
+          0, std::max(kMinimalAnchorPositionOffset - anchor.y(), 0));
     case SHELF_ALIGNMENT_RIGHT:
-      anchor.set_x(button_bounds.x() + kArrowTipHeight);
-      anchor.set_y(std::max(kMinimalAnchorPositionOffset, anchor.y()));
-      break;
+      return gfx::Vector2d(
+          0, std::max(kMinimalAnchorPositionOffset - anchor.y(), 0));
+    default:
+      NOTREACHED();
+      return gfx::Vector2d();
   }
-
-  return anchor;
 }
 
 }  // namespace
@@ -172,22 +160,22 @@ void AppListController::SetVisible(bool visible, aura::Window* window) {
     if (ash::switches::UseAlternateShelfLayout()) {
       gfx::Rect applist_button_bounds = Launcher::ForWindow(container)->
           GetAppListButtonView()->GetBoundsInScreen();
-      view->InitAsBubble(
+      view->InitAsBubbleAttachedToAnchor(
           container,
           pagination_model_.get(),
-          NULL,
-          GetAdjustAnchorPositionToShelf(applist_button_bounds,
+          Launcher::ForWindow(container)->GetAppListButtonView(),
+          GetAnchorPositionOffsetToShelf(applist_button_bounds,
               Launcher::ForWindow(container)->GetAppListButtonView()->
                   GetWidget()),
           GetBubbleArrow(container),
           true /* border_accepts_events */);
       view->SetArrowPaintType(views::BubbleBorder::PAINT_NONE);
     } else {
-      view->InitAsBubble(
+      view->InitAsBubbleAttachedToAnchor(
           container,
           pagination_model_.get(),
           Launcher::ForWindow(container)->GetAppListButtonView(),
-          gfx::Point(),
+          gfx::Vector2d(),
           GetBubbleArrow(container),
           true /* border_accepts_events */);
     }