(Merge to M-51) Revise the shelf alignment locking mechanism.

ash/shelf/shelf_layout_manager.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ash/shelf/shelf_layout_manager.h"
 
 #include <algorithm>
 #include <cmath>
 #include <cstring>
 #include <string>
 #include <vector>
 
 #include "ash/accelerators/accelerator_commands.h"
 #include "ash/ash_switches.h"
 #include "ash/root_window_controller.h"
 #include "ash/screen_util.h"
 #include "ash/session/session_state_delegate.h"
 #include "ash/shelf/shelf.h"
 #include "ash/shelf/shelf_bezel_event_filter.h"
 #include "ash/shelf/shelf_constants.h"
 #include "ash/shelf/shelf_layout_manager_observer.h"
+#include "ash/shelf/shelf_util.h"
 #include "ash/shelf/shelf_widget.h"
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ash/system/status_area_widget.h"
 #include "ash/wm/gestures/shelf_gesture_handler.h"
 #include "ash/wm/lock_state_controller.h"
 #include "ash/wm/mru_window_tracker.h"
 #include "ash/wm/window_animations.h"
 #include "ash/wm/window_state.h"
 #include "ash/wm/window_util.h"
@@ skipping 347 matching lines @@
     const float kDragHideThreshold = 0.4f;
     gfx::Rect bounds = GetIdealBounds();
     float drag_ratio = fabs(gesture_drag_amount_) /
                        (horizontal ? bounds.height() : bounds.width());
     if (gesture_drag_auto_hide_state_ == SHELF_AUTO_HIDE_SHOWN) {
       should_change = drag_ratio > kDragHideThreshold;
     } else {
       bool correct_direction = false;
       switch (GetAlignment()) {
         case SHELF_ALIGNMENT_BOTTOM:
+        case SHELF_ALIGNMENT_BOTTOM_LOCKED:
         case SHELF_ALIGNMENT_RIGHT:
           correct_direction = gesture_drag_amount_ < 0;
           break;
         case SHELF_ALIGNMENT_LEFT:
           correct_direction = gesture_drag_amount_ > 0;
           break;
       }
       should_change = correct_direction && drag_ratio > kDragHideThreshold;
     }
   } else if (gesture.type() == ui::ET_SCROLL_FLING_START) {
@@ skipping 84 matching lines @@
 }
 
 void ShelfLayoutManager::OnWindowActivated(
     aura::client::ActivationChangeObserver::ActivationReason reason,
     aura::Window* gained_active,
     aura::Window* lost_active) {
   UpdateAutoHideStateNow();
 }
 
 bool ShelfLayoutManager::IsHorizontalAlignment() const {
-  return GetAlignment() == SHELF_ALIGNMENT_BOTTOM;
-}
-
-bool ShelfLayoutManager::IsAlignmentLocked() const {
-  if (state_.is_screen_locked)
-    return true;
-  // The session state becomes active at the start of transitioning to a user
-  // session, however the session is considered blocked until the full UI is
-  // ready. Exit early to allow for proper layout.
-  SessionStateDelegate* session_state_delegate =
-      Shell::GetInstance()->session_state_delegate();
-  if (session_state_delegate->GetSessionState() ==
-      SessionStateDelegate::SESSION_STATE_ACTIVE) {
-    return false;
-  }
-  if (session_state_delegate->IsUserSessionBlocked() ||
-      state_.is_adding_user_screen) {
-    return true;
-  }
-  return false;
+  return ash::IsHorizontalAlignment(GetAlignment());
 }
 
 void ShelfLayoutManager::SetChromeVoxPanelHeight(int height) {
   chromevox_panel_height_ = height;
   LayoutShelf();
 }
 
 ////////////////////////////////////////////////////////////////////////////////
 // ShelfLayoutManager, private:
 
@@ skipping 321 matching lines @@
       translate = resistance_free_region + diff;
   } else {
     translate = gesture_drag_amount_;
   }
 
   if (horizontal) {
     // Move and size the shelf with the gesture.
     int shelf_height = target_bounds->shelf_bounds_in_root.height() - translate;
     shelf_height = std::max(shelf_height, kAutoHideSize);
     target_bounds->shelf_bounds_in_root.set_height(shelf_height);
-    if (GetAlignment() == SHELF_ALIGNMENT_BOTTOM) {
+    if (IsHorizontalAlignment()) {
       target_bounds->shelf_bounds_in_root.set_y(
           available_bounds.bottom() - shelf_height);
     }
 
     target_bounds->status_bounds_in_shelf.set_y(0);
   } else {
     // Move and size the shelf with the gesture.
     int shelf_width = target_bounds->shelf_bounds_in_root.width();
     bool right_aligned = GetAlignment() == SHELF_ALIGNMENT_RIGHT;
     if (right_aligned)
@@ skipping 135 matching lines @@
 
   gfx::Rect shelf_region = shelf_->GetWindowBoundsInScreen();
   if (shelf_->status_area_widget() &&
       shelf_->status_area_widget()->IsMessageBubbleShown() &&
       IsVisible()) {
     // Increase the the hit test area to prevent the shelf from disappearing
     // when the mouse is over the bubble gap.
     ShelfAlignment alignment = GetAlignment();
     shelf_region.Inset(
         alignment == SHELF_ALIGNMENT_RIGHT ? -kNotificationBubbleGapHeight : 0,
-        alignment == SHELF_ALIGNMENT_BOTTOM ? -kNotificationBubbleGapHeight : 0,
+        IsHorizontalAlignment() ? -kNotificationBubbleGapHeight : 0,
         alignment == SHELF_ALIGNMENT_LEFT ? -kNotificationBubbleGapHeight : 0,
         0);
   }
 
   gfx::Point cursor_position_in_screen =
       gfx::Screen::GetScreen()->GetCursorScreenPoint();
   if (shelf_region.Contains(cursor_position_in_screen))
     return SHELF_AUTO_HIDE_SHOWN;
 
   // When the shelf is auto hidden and the shelf is on the boundary between two
@@ skipping 89 matching lines @@
   }
   TargetBounds target_bounds;
   CalculateTargetBounds(state_, &target_bounds);
   UpdateBoundsAndOpacity(target_bounds, true, NULL);
   UpdateVisibilityState();
 }
 
 void ShelfLayoutManager::UpdateShelfVisibilityAfterLoginUIChange() {
   UpdateVisibilityState();
   LayoutShelf();
-  // The shelf alignment may have changed when it was unlocked.
-  Shell::GetInstance()->OnShelfAlignmentChanged(
-      shelf_->GetNativeWindow()->GetRootWindow());
 }
 
 }  // namespace ash