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      1 // Copyright 2014 The Chromium Authors. All rights reserved.
      2 // Use of this source code is governed by a BSD-style license that can be
      3 // found in the LICENSE file.
      4 
      5 #include "ui/views/window/window_button_order_provider.h"
      6 
      7 #include "ui/views/linux_ui/linux_ui.h"
      8 #include "ui/views/linux_ui/window_button_order_observer.h"
      9 
     10 namespace views {
     11 
     12 namespace {
     13 
     14 class WindowButtonOrderObserverDelegate : public WindowButtonOrderProvider,
     15                                           public WindowButtonOrderObserver {
     16  public:
     17   WindowButtonOrderObserverDelegate();
     18   virtual ~WindowButtonOrderObserverDelegate();
     19 
     20   // WindowButtonOrderObserver:
     21   virtual void OnWindowButtonOrderingChange(
     22       const std::vector<views::FrameButton>& leading_buttons,
     23       const std::vector<views::FrameButton>& trailing_buttons) OVERRIDE;
     24  private:
     25   DISALLOW_COPY_AND_ASSIGN(WindowButtonOrderObserverDelegate);
     26 };
     27 
     28 ///////////////////////////////////////////////////////////////////////////////
     29 // WindowButtonOrderObserverDelegate, public:
     30 
     31 WindowButtonOrderObserverDelegate::WindowButtonOrderObserverDelegate() {
     32   views::LinuxUI* ui = views::LinuxUI::instance();
     33   if (ui)
     34     ui->AddWindowButtonOrderObserver(this);
     35 }
     36 
     37 WindowButtonOrderObserverDelegate::~WindowButtonOrderObserverDelegate() {
     38   views::LinuxUI* ui = views::LinuxUI::instance();
     39   if (ui)
     40     ui->RemoveWindowButtonOrderObserver(this);
     41 }
     42 
     43 void WindowButtonOrderObserverDelegate::OnWindowButtonOrderingChange(
     44     const std::vector<views::FrameButton>& leading_buttons,
     45     const std::vector<views::FrameButton>& trailing_buttons) {
     46   SetWindowButtonOrder(leading_buttons, trailing_buttons);
     47 }
     48 
     49 }  // namespace
     50 
     51 // static
     52 WindowButtonOrderProvider* WindowButtonOrderProvider::instance_ = NULL;
     53 
     54 ///////////////////////////////////////////////////////////////////////////////
     55 // WindowButtonOrderProvider, public:
     56 
     57 // static
     58 WindowButtonOrderProvider* WindowButtonOrderProvider::GetInstance() {
     59   if (!instance_)
     60     instance_ = new WindowButtonOrderObserverDelegate;
     61   return instance_;
     62 }
     63 
     64 ///////////////////////////////////////////////////////////////////////////////
     65 // WindowButtonOrderProvider, protected:
     66 
     67 WindowButtonOrderProvider::WindowButtonOrderProvider() {
     68   trailing_buttons_.push_back(views::FRAME_BUTTON_MINIMIZE);
     69   trailing_buttons_.push_back(views::FRAME_BUTTON_MAXIMIZE);
     70   trailing_buttons_.push_back(views::FRAME_BUTTON_CLOSE);
     71 }
     72 
     73 WindowButtonOrderProvider::~WindowButtonOrderProvider() {
     74 }
     75 
     76 void WindowButtonOrderProvider::SetWindowButtonOrder(
     77     const std::vector<views::FrameButton>& leading_buttons,
     78     const std::vector<views::FrameButton>& trailing_buttons) {
     79   leading_buttons_ = leading_buttons;
     80   trailing_buttons_ = trailing_buttons;
     81 }
     82 
     83 }  // namespace views
     84