Add touchpad speed factor setting to Chrome OS touchpad settings page...

views/controls/slider/slider.h

+// Copyright (c) 2009 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_SLIDER_SLIDER_H_
+#define VIEWS_CONTROLS_SLIDER_SLIDER_H_
+
+#if defined(OS_LINUX)
+#include <gdk/gdk.h>
+#endif
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "views/view.h"
+
+namespace views {
+
+class NativeSliderWrapper;
+class Slider;
+
+// An interface implemented by an object to let it know that the slider value
+// was changed.
+class SliderListener {
+ public:
+  virtual void SliderValueChanged(Slider* sender) = 0;
+};
+
+// This class implements a ChromeView that wraps a native slider.
+class Slider : public View {
+ public:
+  // The slider's class name.
+  static const char kViewClassName[];
+
+  enum StyleFlags {
+    STYLE_HORIZONTAL = 0,  // Horizontal is default type.
+    STYLE_VERTICAL = 1<<0,
+    STYLE_DRAW_VALUE = 1<<1,  // Display current value next to the slider.
+    STYLE_ONE_DIGIT = 1<<2,  // 1 decimal place of precision for value.
+    STYLE_TWO_DIGITS = 1<<3,  // 2 decimal places of precision for value.
+    STYLE_UPDATE_ON_RELEASE = 1<<4,  // The slider will only notify value
+                                     // changed on release of mouse
+  };
+
+  Slider();
+  Slider(double min, double max, double step, StyleFlags style,
+         SliderListener* listener);
+  virtual ~Slider();
+
+  // Cause the slider to notify the listener that the value has changed.
+  virtual void NotifyValueChanged();
+
+  // Gets/Sets the value in the slider.
+  const double value() const { return value_; }
+  void SetValue(double value);
+
+  // Accessor for |style_|.
+  StyleFlags style() const { return style_; }
+
+  // Accessor for |min_|.
+  const double min() const { return min_; }
+
+  // Accessor for |max_|.
+  const double max() const { return max_; }
+
+  // Accessor for |step_|.
+  const double step() const { return step_; }
+
+  // Overridden from View:
+  virtual void Layout();
+  virtual gfx::Size GetPreferredSize();
+  virtual bool IsFocusable() const;
+  virtual void SetEnabled(bool enabled);
+
+ protected:
+  virtual void Focus();
+  virtual void ViewHierarchyChanged(bool is_add, View* parent, View* child);
+  virtual std::string GetClassName() const;
+
+  // Creates a new native wrapper properly initialized and returns it. Ownership
+  // is passed to the caller.
+  NativeSliderWrapper* CreateWrapper();
+
+ private:
+  // The object that actually implements the native slider.
+  NativeSliderWrapper* native_wrapper_;
+
+  // The slider's listener. Notified when slider value changed.
+  SliderListener* listener_;
+
+  // The mask of style options for this Slider.
+  StyleFlags style_;
+
+  // The minimum value of the slider.
+  double min_;
+
+  // The maximum value of the slider.
+  double max_;
+
+  // The step increment of the slider.
+  double step_;
+
+  // The value displayed in the slider.
+  double value_;
+
+  DISALLOW_COPY_AND_ASSIGN(Slider);
+};
+
+}  // namespace views
+
+#endif  // VIEWS_CONTROLS_SLIDER_SLIDER_H_