Widgets de Escala
Gtk::Scale widgets (or "sliders") allow the user to visually select and manipulate a value within a specific range. You might use one, for instance, to adjust the magnification level on a zoomed preview of a picture, or to control the brightness of a colour, or to specify the number of minutes of inactivity before a screensaver takes over the screen.
As with Scrollbars, there are separate widget types for horizontal and vertical widgets - Gtk::HScale and Gtk::VScale. The default constructors create an Adjustment with all of its values set to 0.0. This isn't useful so you will need to set some Adjustment details to get meaningful behaviour.
- 6.2.1. Métodos útiles
6.2.1. Métodos útiles
Scale widgets can display their current value as a number next to the trough. By default they show the value, but you can change this with the set_draw_value() method.
The value displayed by a scale widget is rounded to one decimal point by default, as is the value field in its Gtk::Adjustment. You can change this with the set_digits() method.
Also, the value can be drawn in different positions relative to the trough, specified by the set_value_pos() method.