CrOS Tablet Window management - Split Screen part I

ash/wm/maximize_mode/maximize_mode_window_state.h

 // Copyright 2014 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.
 
 #ifndef ASH_WM_MAXIMIZE_MODE_MAXIMIZE_MODE_WINDOW_STATE_H_
 #define ASH_WM_MAXIMIZE_MODE_MAXIMIZE_MODE_WINDOW_STATE_H_
 
 #include <memory>
 
 #include "ash/wm/window_state.h"
@@ skipping 44 matching lines @@
   // change get animated.
   void UpdateWindow(wm::WindowState* window_state,
                     wm::WindowStateType new_state_type,
                     bool animate);
 
   // Depending on the capabilities of the window we either return
   // |WINDOW_STATE_TYPE_MAXIMIZED| or |WINDOW_STATE_TYPE_NORMAL|.
   wm::WindowStateType GetMaximizedOrCenteredWindowType(
       wm::WindowState* window_state);
 
+  // If |target_state| is LEFT/RIGHT_SNAPPED and the window can be snapped,
+  // return |target_state|. Otherwise depending on the capabilities of the
+  // window we either return |WINDOW_STATE_TYPE_MAXIMIZED| or
+  // |WINDOW_STATE_TYPE_NORMAL|.
+  wm::WindowStateType GetSnappedWindowStateType(
+      wm::WindowState* window_state,
+      wm::WindowStateType target_state);
+
   // Updates the bounds to the maximum possible bounds according to the current
   // window state. If |animated| is set we animate the change.
   void UpdateBounds(wm::WindowState* window_state, bool animated);
 
   // The original state object of the window.
   std::unique_ptr<wm::WindowState::State> old_state_;
 
   // The window whose WindowState owns this instance.
   aura::Window* window_;
 
   // The creator which needs to be informed when this state goes away.
   MaximizeModeWindowManager* creator_;
 
   // The current state type. Due to the nature of this state, this can only be
   // WM_STATE_TYPE{NORMAL, MINIMIZED, MAXIMIZED}.
   wm::WindowStateType current_state_type_;
 
   // If true, do not update bounds.
   bool defer_bounds_updates_;
 
   // If true, the state will not process events.
   bool ignore_wm_events_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(MaximizeModeWindowState);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_MAXIMIZE_MODE_MAXIMIZE_MODE_WINDOW_STATE_H_