# Gtk::Scale Class Reference
Widgets

Base clase for Gtk::HScale and Gtk::VScale. More...

Inheritance diagram for Gtk::Scale:
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Collaboration diagram for Gtk::Scale:
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List of all members.

## Public Member Functions

virtual | ~Scale ()
GtkScale* | gobj ()
| Provides access to the underlying C GtkObject.
const GtkScale* | gobj () const
| Provides access to the underlying C GtkObject.
| Scale ()
| Scale (const Glib::RefPtr< Adjustment >& adjustment, Orientation orientation=ORIENTATION_HORIZONTAL)
void | set_digits (int digits)
| Set the number of decimal digits.
int | get_digits () const
| Get the number of decimal digits.
void | set_draw_value (bool draw_value=true)
| Set whether the current value is displayed as a string next to the slider.
bool | get_draw_value () const
| Get whether the current value is displayed as a string next to the slider.
void | set_value_pos (PositionType pos)
| Set the position in which the value is displayed.
PositionType | get_value_pos () const
| Get the position in which the value is displayed.
Glib::RefPtr< Pango::Layout > | get_layout ()
| Gets the Pango::Layout used to display the scale.
Glib::RefPtr< const Pango::Layout > | get_layout () const
| Gets the Pango::Layout used to display the scale.
void | get_layout_offsets (int& x, int& y) const
| Obtains the coordinates where the scale will draw the Pango::Layout representing the text in the scale.
void | add_mark (double value, PositionType position, const Glib::ustring& markup)
| Adds a mark at value.
void | clear_marks ()
| Removes any marks that have been added with add_mark().
Glib::SignalProxy1 < Glib::ustring, double > | signal_format_value ()
| Determines how the value is formatted.
Glib::PropertyProxy< int > | property_digits ()
| Number of displayed decimal digits.
Glib::PropertyProxy_ReadOnly< int > | property_digits () const
| The number of decimal places that are displayed in the value.
Glib::PropertyProxy< bool > | property_draw_value ()
| Whether to draw the value as a string next to slider.
Glib::PropertyProxy_ReadOnly < bool > | property_draw_value () const
| Whether the current value is displayed as a string next to the slider.
Glib::PropertyProxy< PositionType > | property_value_pos ()
| The position in which the value is displayed.
Glib::PropertyProxy_ReadOnly < PositionType > | property_value_pos () const
| The position in which the current value is displayed.

## Protected Member Functions

virtual Glib::ustring | on_format_value (double value)
virtual void | draw_value_vfunc ()
virtual int | calc_digits_ (double step) const

## Related Functions

(Note that these are not member functions.)
Gtk::Scale* | wrap (GtkScale* object, bool take_copy=false)
| A Glib::wrap() method for this object.

## Detailed Description

Base clase for Gtk::HScale and Gtk::VScale.

A Gtk::Scale is a slider control used to select a numeric value. To use it, you'll probably want to investigate the methods on its base class, Gtk::Range, in addition to the methods for Gtk::Scale itself. To set the value of a scale, you would normally use set_value(). To detect changes to the value, you would normally use signal_value_changed().

## Constructor & Destructor Documentation

virtual Gtk::Scale::~Scale | ( |  | ) | `[virtual]`

Gtk::Scale::Scale | ( |  | ) |

Gtk::Scale::Scale | ( | const Glib::RefPtr< Adjustment >& | adjustment,
|  | Orientation | orientation = `ORIENTATION_HORIZONTAL`
| ) |  | `[explicit]`

## Member Function Documentation

void Gtk::Scale::add_mark | ( | double | value,
|  | PositionType | position,
|  | const Glib::ustring & | markup
| ) |  |

Adds a mark at value.

A mark is indicated visually by drawing a tick mark next to the scale, and GTK+ makes it easy for the user to position the scale exactly at the marks value.

If markup is not `0`, text is shown next to the tick mark.

To remove marks from a scale, use clear_marks().

Since gtkmm 2.16:

Parameters:

  value | The value at which the mark is placed, must be between the lower and upper limits of the scales' adjustment.
  position | Where to draw the mark. For a horizontal scale, Gtk::POS_TOP is drawn above the scale, anything else below. For a vertical scale, Gtk::POS_LEFT is drawn to the left of the scale, anything else to the right.
  markup | Text to be shown at the mark, using , or `0`.

virtual int Gtk::Scale::calc_digits_ | ( | double | step | ) | const`[protected, virtual]`

void Gtk::Scale::clear_marks | ( |  | ) |

Removes any marks that have been added with add_mark().

Since gtkmm 2.16:

virtual void Gtk::Scale::draw_value_vfunc | ( |  | ) | `[protected, virtual]`

int Gtk::Scale::get_digits | ( |  | ) | const

Get the number of decimal digits.

bool Gtk::Scale::get_draw_value | ( |  | ) | const

Get whether the current value is displayed as a string next to the slider.

Glib::RefPtr<const Pango::Layout> Gtk::Scale::get_layout | ( |  | ) | const

Gets the Pango::Layout used to display the scale.

The returned object is owned by the scale so does not need to be freed by the caller.

Since gtkmm 2.4:

Returns:
  The Pango::Layout for this scale, or `0` if the Gtk::Scale:draw-value property is `false`.

Glib::RefPtr<Pango::Layout> Gtk::Scale::get_layout | ( |  | ) |

Gets the Pango::Layout used to display the scale.

The returned object is owned by the scale so does not need to be freed by the caller.

Since gtkmm 2.4:

Returns:
  The Pango::Layout for this scale, or `0` if the Gtk::Scale:draw-value property is `false`.

void Gtk::Scale::get_layout_offsets | ( | int & | x,
|  | int & | y
| ) |  | const

Obtains the coordinates where the scale will draw the Pango::Layout representing the text in the scale.

Remember when using the Pango::Layout function you need to convert to and from pixels using PANGO_PIXELS() or Pango::SCALE.

If the Gtk::Scale:draw-value property is `false`, the return values are undefined.

Since gtkmm 2.4:

Parameters:

  x | Location to store X offset of layout, or `0`.
  y | Location to store Y offset of layout, or `0`.

PositionType Gtk::Scale::get_value_pos | ( |  | ) | const

Get the position in which the value is displayed.

GtkScale* Gtk::Scale::gobj | ( |  | ) | `[inline]`

Provides access to the underlying C GtkObject.

Reimplemented from Gtk::Range.

Reimplemented in Gtk::VScale, and Gtk::HScale.

const GtkScale* Gtk::Scale::gobj | ( |  | ) | const`[inline]`

Provides access to the underlying C GtkObject.

Reimplemented from Gtk::Range.

Reimplemented in Gtk::VScale, and Gtk::HScale.

virtual Glib::ustring Gtk::Scale::on_format_value | ( | double | value | ) | `[protected, virtual]`

Glib::PropertyProxy_ReadOnly<int> Gtk::Scale::property_digits | ( |  | ) | const

The number of decimal places that are displayed in the value.

You rarely need to use properties because there are get_ and set_ methods for almost all of them.

Returns:
  A PropertyProxy that allows you to get or set the property of the value, or receive notification when the value of the property changes.

Glib::PropertyProxy<int> Gtk::Scale::property_digits | ( |  | ) |

Number of displayed decimal digits.

The number of decimal places that are displayed in the value.

You rarely need to use properties because there are get_ and set_ methods for almost all of them.

Returns:
  A PropertyProxy that allows you to get or set the property of the value, or receive notification when the value of the property changes.

Glib::PropertyProxy<bool> Gtk::Scale::property_draw_value | ( |  | ) |

Whether to draw the value as a string next to slider.

Whether the current value is displayed as a string next to the slider.

You rarely need to use properties because there are get_ and set_ methods for almost all of them.

Returns:
  A PropertyProxy that allows you to get or set the property of the value, or receive notification when the value of the property changes.

Glib::PropertyProxy_ReadOnly<bool> Gtk::Scale::property_draw_value | ( |  | ) | const

Whether the current value is displayed as a string next to the slider.

You rarely need to use properties because there are get_ and set_ methods for almost all of them.

Returns:
  A PropertyProxy that allows you to get or set the property of the value, or receive notification when the value of the property changes.

Glib::PropertyProxy<PositionType> Gtk::Scale::property_value_pos | ( |  | ) |

The position in which the value is displayed.

The position in which the current value is displayed.

You rarely need to use properties because there are get_ and set_ methods for almost all of them.

Returns:
  A PropertyProxy that allows you to get or set the property of the value, or receive notification when the value of the property changes.

Glib::PropertyProxy_ReadOnly<PositionType> Gtk::Scale::property_value_pos | ( |  | ) | const

The position in which the current value is displayed.

You rarely need to use properties because there are get_ and set_ methods for almost all of them.

Returns:
  A PropertyProxy that allows you to get or set the property of the value, or receive notification when the value of the property changes.

void Gtk::Scale::set_digits | ( | int | digits | ) |

Set the number of decimal digits.

This also causes the adjustment to be rounded off so the retrieved value matches the value the user sees. Setting digits to 1 gives for example 1.0, 2 gives 1.00, etc.

void Gtk::Scale::set_draw_value | ( | bool | draw_value = `true` | ) |

Set whether the current value is displayed as a string next to the slider.

void Gtk::Scale::set_value_pos | ( | PositionType | pos | ) |

Set the position in which the value is displayed.

Glib::SignalProxy1< Glib::ustring,double > Gtk::Scale::signal_format_value | ( |  | ) |

Determines how the value is formatted.

This can be used to connect a custom function for determining how the value is formatted. The function (or function object) is given a the value as a double and should return the representation of it as a Glib::ustring.

Prototype:
  `Glib::ustring on_my_format_value(double value)`

## Friends And Related Function Documentation

Gtk::Scale* wrap | ( | GtkScale * | object,
|  | bool | take_copy = `false`
| ) |  | `[related]`

A Glib::wrap() method for this object.

Parameters:

  object | The C instance.
  take_copy | False if the result should take ownership of the C instance. True if it should take a new copy or ref.

Returns:
  A C++ instance that wraps this C instance.

The documentation for this class was generated from the following file:

- gtkmm/scale.h