Table of Contents
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Gtk::Scale and Gtk::Scrollbar both inherit from Gtk::Range and share much functionality. They contain a "trough" and a "slider" (sometimes
called a "thumbwheel" in other GUI environments). Dragging the slider
with the pointer moves it within the trough, while
clicking in the trough advances the slider towards the location of the
click, either completely, or by a designated amount, depending on
which mouse button is used. This should be familiar scrollbar behaviour.
As will be explained in the Adjustment section, all Range widgets are associated with a Adjustment object. To change the lower, upper, and current values used by the widget you need to use the methods of its Adjustment, which you can get with the get_adjustment() method. The Range widgets' default constructors create an Adjustment automatically, or you can specify an existing Adjustment, maybe to share it with another widget. See the Adjustments section for further details These are standard scrollbars. They should be used only to scroll another widget, such as, a Gtk::Entry, or a Gtk::Viewport, though it's usually easier to use the Gtk::ScrolledWindow widget in most cases. There are horizontal and vertical scrollbar classes - Gtk::HScrollbar and Gtk::VScrollbar. |