Wayland support for views. views_desktop on Wayland.

views/controls/scrollbar/native_scroll_bar_wayland.h

+// Copyright (c) 2011 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 VIEWS_CONTROLS_SCROLLBAR_NATIVE_SCROLL_BAR_WAYLAND_H_

[Ben Goodger (Google), 2011/08/16 17:58:45]

qq: won't Wayland just use the views-based scrollbars like the other ports will?

e.g. NativeScrollbarViews.

Eventually we'll get rid of NativeScrollbars altogether and just have ScrollBar,
a views-based class.

+#define VIEWS_CONTROLS_SCROLLBAR_NATIVE_SCROLL_BAR_WAYLAND_H_
+#pragma once
+
+#include "views/controls/native_control_wayland.h"
+#include "views/controls/scrollbar/native_scroll_bar_wrapper.h"
+
+namespace ui {
+class WaylandWidget;
+}  // namespace ui
+
+namespace views {
+
+class ScrollBarContainer;
+
+class NativeScrollBarWayland : public NativeControlWayland,
+                               public NativeScrollBarWrapper {
+ public:
+  // Creates new scrollbar, either horizontal or vertical.
+  explicit NativeScrollBarWayland(NativeScrollBar* native_scroll_bar);
+  virtual ~NativeScrollBarWayland();
+
+ private:
+  // Overridden from View for layout purpose.
+  virtual void Layout();
+  virtual gfx::Size GetPreferredSize();
+
+  // Overridden from View for keyboard UI purpose.
+  virtual bool OnKeyPressed(const KeyEvent& event);
+  virtual bool OnMouseWheel(const MouseWheelEvent& e);
+
+  // Overridden from NativeControlGtk.
+  virtual void CreateNativeControl();
+
+  // Overridden from NativeScrollBarWrapper.
+  virtual int GetPosition() const;
+  virtual View* GetView();
+  virtual void Update(int viewport_size, int content_size, int current_pos);
+
+  // Moves the scrollbar by the given value. Negative value is allowed.
+  // (moves upward)
+  void MoveBy(int o);
+
+  // Moves the scrollbar by the page (viewport) size.
+  void MovePage(bool positive);
+
+  // Moves the scrollbar by predefined step size.
+  void MoveStep(bool positive);
+
+  // Moves the scrollbar to the given position. MoveTo(0) moves it to the top.
+  void MoveTo(int p);
+
+  // Moves the scrollbar to the end.
+  void MoveToBottom();
+
+  // Invoked when the scrollbar's position is changed.
+  void ValueChanged();
+
+  static void CallValueChanged(ui::WaylandWidget* widget,
+                               NativeScrollBarWayland* scroll_bar);
+
+  // The NativeScrollBar we are bound to.
+  NativeScrollBar* native_scroll_bar_;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(NativeScrollBarWayland);
+};
+
+}  // namespace views
+
+#endif  // #ifndef VIEWS_CONTROLS_SCROLLBAR_NATIVE_SCROLL_BAR_WAYLAND_H_
+