[Refactor] Move the logic to update bounds for show type from WorkspaceLayoutManager to DefaultState

ash/wm/window_state.cc

 // Copyright 2013 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/wm/window_state.h"
 
 #include "ash/ash_switches.h"
 #include "ash/root_window_controller.h"
 #include "ash/screen_util.h"
 #include "ash/shell_window_ids.h"
 #include "ash/wm/default_state.h"
 #include "ash/wm/window_properties.h"
 #include "ash/wm/window_state_delegate.h"
 #include "ash/wm/window_state_observer.h"
 #include "ash/wm/window_util.h"
 #include "ash/wm/wm_types.h"
 #include "base/auto_reset.h"
 #include "base/command_line.h"
 #include "ui/aura/client/aura_constants.h"
+#include "ui/aura/layout_manager.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_delegate.h"
+#include "ui/compositor/scoped_layer_animation_settings.h"
 #include "ui/gfx/display.h"
 #include "ui/views/corewm/window_util.h"
 
 namespace ash {
 namespace wm {
 
+namespace {
+
+// A tentative class to set the bounds on the window.
+// TODO(oshima): Once all logic are cleaned up, move this to the real layout
+// manager with proper friendship.
+class BoundsSetter : public aura::LayoutManager {
+ public:
+  BoundsSetter() {}
+  virtual ~BoundsSetter() {}
+
+  // aura::LayoutManager overrides:
+  virtual void OnWindowResized() OVERRIDE {}
+  virtual void OnWindowAddedToLayout(aura::Window* child) OVERRIDE {}
+  virtual void OnWillRemoveWindowFromLayout(aura::Window* child) OVERRIDE {}
+  virtual void OnWindowRemovedFromLayout(aura::Window* child) OVERRIDE {}
+  virtual void OnChildWindowVisibilityChanged(
+      aura::Window* child, bool visible) OVERRIDE {}
+  virtual void SetChildBounds(
+      aura::Window* child, const gfx::Rect& requested_bounds) OVERRIDE {}
+
+  void SetBounds(aura::Window* window, const gfx::Rect& bounds) {
+    SetChildBoundsDirect(window, bounds);
+  }
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(BoundsSetter);
+};
+
+WMEvent WMEventFromShowState(ui::WindowShowState requested_show_state) {
+  switch (requested_show_state) {
+    case ui::SHOW_STATE_DEFAULT:
+    case ui::SHOW_STATE_NORMAL:
+      return NORMAL;
+    case ui::SHOW_STATE_MINIMIZED:
+      return MINIMIZE;
+    case ui::SHOW_STATE_MAXIMIZED:
+      return MAXIMIZE;
+    case ui::SHOW_STATE_FULLSCREEN:
+      return FULLSCREEN;
+    case ui::SHOW_STATE_INACTIVE:
+    case ui::SHOW_STATE_DETACHED:
+    case ui::SHOW_STATE_END:
+      NOTREACHED() << "No WMEvent defined for the show type:"
+                   << requested_show_state;
+  }
+  return NORMAL;
+}
+
+}  // namespace
+
 WindowState::WindowState(aura::Window* window)
     : window_(window),
       window_position_managed_(false),
       bounds_changed_by_user_(false),
       panel_attached_(true),
       continue_drag_after_reparent_(false),
       ignored_by_shelf_(false),
       can_consume_system_keys_(false),
       top_row_keys_are_function_keys_(false),
       unminimize_to_restore_bounds_(false),
       hide_shelf_when_fullscreen_(true),
       animate_to_fullscreen_(true),
       minimum_visibility_(false),
-      in_set_window_show_type_(false),
+      ignore_property_change_(false),
       window_show_type_(ToWindowShowType(GetShowState())),
       current_state_(new DefaultState) {
   window_->AddObserver(this);
 
 #if defined(OS_CHROMEOS)
   // NOTE(pkotwicz): Animating to immersive fullscreen does not look good. When
   // switches::UseImmersiveFullscreenForAllWindows() returns true, most windows
   // can be put into immersive fullscreen. It is not worth the added complexity
   // to only animate to fullscreen if the window is put into immersive
   // fullscreen.
@@ skipping 213 matching lines @@
 void WindowState::DeleteDragDetails() {
   drag_details_.reset();
 }
 
 void WindowState::SetAndClearRestoreBounds() {
   DCHECK(HasRestoreBounds());
   SetBoundsInScreen(GetRestoreBoundsInScreen());
   ClearRestoreBounds();
 }
 
+void WindowState::AdjustSnappedBounds(gfx::Rect* bounds) {
+  if (is_dragged() || !IsSnapped())
+    return;
+  gfx::Rect maximized_bounds = ScreenUtil::GetMaximizedWindowBoundsInParent(
+      window_);
+  if (window_show_type() == wm::SHOW_TYPE_LEFT_SNAPPED)
+    bounds->set_x(maximized_bounds.x());
+  else if (window_show_type() == wm::SHOW_TYPE_RIGHT_SNAPPED)
+    bounds->set_x(maximized_bounds.right() - bounds->width());
+  bounds->set_y(maximized_bounds.y());
+  // TODO(varkha): Set width to 50% here for snapped windows.
+  bounds->set_height(maximized_bounds.height());
+}
+
 void WindowState::OnWindowPropertyChanged(aura::Window* window,
                                           const void* key,
                                           intptr_t old) {
   DCHECK_EQ(window, window_);
-  if (key == aura::client::kShowStateKey)
-    SetWindowShowType(ToWindowShowType(GetShowState()));
+  if (key == aura::client::kShowStateKey && !ignore_property_change_)
+    OnWMEvent(WMEventFromShowState(GetShowState()));
 }
 
 void WindowState::SnapWindow(WindowShowType left_or_right,
                              const gfx::Rect& bounds) {
   if (window_show_type_ == left_or_right) {
     window_->SetBounds(bounds);
     return;
   }
 
   // Compute the bounds that the window will restore to. If the window does not
   // already have restore bounds, it will be restored (when un-snapped) to the
   // last bounds that it had before getting snapped.
   gfx::Rect restore_bounds_in_screen(HasRestoreBounds() ?
       GetRestoreBoundsInScreen() : window_->GetBoundsInScreen());
   // Set the window's restore bounds so that WorkspaceLayoutManager knows
   // which width to use when the snapped window is moved to the edge.
   SetRestoreBoundsInParent(bounds);
 
   DCHECK(left_or_right == SHOW_TYPE_LEFT_SNAPPED ||
          left_or_right == SHOW_TYPE_RIGHT_SNAPPED);
-  SetWindowShowType(left_or_right);
+  OnWMEvent(left_or_right == SHOW_TYPE_LEFT_SNAPPED ?
+            SNAP_LEFT : SNAP_RIGHT);
+
   // TODO(varkha): Ideally the bounds should be changed in a LayoutManager upon
   // observing the WindowShowType change.
   // If the window is a child of kShellWindowId_DockedContainer such as during
   // a drag, the window's bounds are not set in
   // WorkspaceLayoutManager::OnWindowShowTypeChanged(). Set them here. Skip
   // setting the bounds otherwise to avoid stopping the slide animation which
   // was started as a result of OnWindowShowTypeChanged().
   if (IsDocked())
     window_->SetBounds(bounds);
   SetRestoreBoundsInScreen(restore_bounds_in_screen);
 }
 
-void WindowState::SetWindowShowType(WindowShowType new_window_show_type) {
-  if (in_set_window_show_type_)
-    return;
-  base::AutoReset<bool> resetter(&in_set_window_show_type_, true);
-
+void WindowState::UpdateWindowShowType(WindowShowType new_window_show_type) {
   ui::WindowShowState new_window_state =
       ToWindowShowState(new_window_show_type);
+  base::AutoReset<bool> resetter(&ignore_property_change_, true);
   if (new_window_state != GetShowState())
     window_->SetProperty(aura::client::kShowStateKey, new_window_state);
-  WindowShowType old_window_show_type = window_show_type_;
   window_show_type_ = new_window_show_type;
-  if (old_window_show_type != window_show_type_) {
-    FOR_EACH_OBSERVER(WindowStateObserver, observer_list_,
-                      OnWindowShowTypeChanged(this, old_window_show_type));
-  }
+}
+
+void WindowState::NotifyPreShowTypeChange(WindowShowType old_window_show_type) {
+  FOR_EACH_OBSERVER(WindowStateObserver, observer_list_,
+                    OnPreWindowShowTypeChange(this, old_window_show_type));
+}
+
+void WindowState::NotifyPostShowTypeChange(
+    WindowShowType old_window_show_type) {
+  FOR_EACH_OBSERVER(WindowStateObserver, observer_list_,
+                    OnPostWindowShowTypeChange(this, old_window_show_type));
+}
+
+void WindowState::SetBoundsDirect(const gfx::Rect& bounds) {
+  BoundsSetter().SetBounds(window_, bounds);
+}
+
+void WindowState::SetBoundsDirectAnimated(const gfx::Rect& bounds) {
+  const int kBoundsChangeSlideDurationMs = 120;
+
+  ui::Layer* layer = window_->layer();
+  ui::ScopedLayerAnimationSettings slide_settings(layer->GetAnimator());
+  slide_settings.SetPreemptionStrategy(
+      ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
+  slide_settings.SetTransitionDuration(
+      base::TimeDelta::FromMilliseconds(kBoundsChangeSlideDurationMs));
+  SetBoundsDirect(bounds);
 }
 
 WindowState* GetActiveWindowState() {
   aura::Window* active = GetActiveWindow();
   return active ? GetWindowState(active) : NULL;
 }
 
 WindowState* GetWindowState(aura::Window* window) {
   if (!window)
     return NULL;
   WindowState* settings = window->GetProperty(internal::kWindowStateKey);
   if(!settings) {
     settings = new WindowState(window);
     window->SetProperty(internal::kWindowStateKey, settings);
   }
   return settings;
 }
 
 const WindowState* GetWindowState(const aura::Window* window) {
   return GetWindowState(const_cast<aura::Window*>(window));
 }
 
 }  // namespace wm
 }  // namespace ash