Re-Reland Linux Window Control Alignment

ui/views/linux_ui/window_button_order_provider.cc

+// 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.
+
+#include "ui/views/window/window_button_order_provider.h"
+
+#include "ui/views/linux_ui/linux_ui.h"
+#include "ui/views/linux_ui/window_button_order_observer.h"
+
+namespace views {
+
+namespace {
+
+class WindowButtonOrderObserverDelegate : public WindowButtonOrderProvider,
+                                          public WindowButtonOrderObserver {
+ public:
+  WindowButtonOrderObserverDelegate();
+  virtual ~WindowButtonOrderObserverDelegate();
+
+  // WindowButtonOrderObserver:
+  virtual void OnWindowButtonOrderingChange(
+      const std::vector<views::FrameButton>& leading_buttons,
+      const std::vector<views::FrameButton>& trailing_buttons) OVERRIDE;
+ private:
+  DISALLOW_COPY_AND_ASSIGN(WindowButtonOrderObserverDelegate);
+};
+
+///////////////////////////////////////////////////////////////////////////////
+// WindowButtonOrderObserverDelegate, public:
+
+WindowButtonOrderObserverDelegate::WindowButtonOrderObserverDelegate() {
+  views::LinuxUI* ui = views::LinuxUI::instance();
+  if (ui)
+    ui->AddWindowButtonOrderObserver(this);
+}
+
+WindowButtonOrderObserverDelegate::~WindowButtonOrderObserverDelegate() {
+  views::LinuxUI* ui = views::LinuxUI::instance();
+  if (ui)
+    ui->RemoveWindowButtonOrderObserver(this);
+}
+
+void WindowButtonOrderObserverDelegate::OnWindowButtonOrderingChange(
+    const std::vector<views::FrameButton>& leading_buttons,
+    const std::vector<views::FrameButton>& trailing_buttons) {
+  SetWindowButtonOrder(leading_buttons, trailing_buttons);
+}
+
+}  // namespace
+
+// static
+WindowButtonOrderProvider* WindowButtonOrderProvider::instance_ = NULL;
+
+///////////////////////////////////////////////////////////////////////////////
+// WindowButtonOrderProvider, public:
+
+// static
+WindowButtonOrderProvider* WindowButtonOrderProvider::GetInstance() {
+  if (!instance_)
+    instance_ = new WindowButtonOrderObserverDelegate;
+  return instance_;
+}
+
+///////////////////////////////////////////////////////////////////////////////
+// WindowButtonOrderProvider, protected:
+
+WindowButtonOrderProvider::WindowButtonOrderProvider() {
+  trailing_buttons_.push_back(views::FRAME_BUTTON_MINIMIZE);
+  trailing_buttons_.push_back(views::FRAME_BUTTON_MAXIMIZE);
+  trailing_buttons_.push_back(views::FRAME_BUTTON_CLOSE);
+}
+
+WindowButtonOrderProvider::~WindowButtonOrderProvider() {
+}
+
+void WindowButtonOrderProvider::SetWindowButtonOrder(
+    const std::vector<views::FrameButton>& leading_buttons,
+    const std::vector<views::FrameButton>& trailing_buttons) {
+  leading_buttons_ = leading_buttons;
+  trailing_buttons_ = trailing_buttons;
+}
+
+}  // namespace views