| Chapter 14. Adjustments | ||
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| Chapter 14. Adjustments | ||
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Table of Contents
gtkmm has various widgets that can be visually adjusted using the mouse or
the keyboard, such as the Range widgets (described in
the Range Widgets section). There are
also a few widgets that display some adjustable part of a larger area, such as
the Viewport widget. These widgets have
Gtk::Adjustment objects that express this common part of
their API.
So that applications can react to changes, for instance when a user moves a
scrollbar, Gtk::Adjustment has a
value_changed signal. You can then use the
get_value() method to discover the new value.
The Gtk::Adjustment is created by its
create() method which is as follows:
Glib::RefPtr<Gtk::Adjustment> Gtk::Adjustment::create( double value, double lower, double upper, double step_increment = 1, double page_increment = 10, double page_size = 0);
The value argument is the initial value of the
adjustment, usually corresponding to the topmost or leftmost position of an
adjustable widget. The lower and
upper arguments specify the possible range of values
which the adjustment can hold. The
step_increment argument specifies the smaller of
the two increments by which the user can change the value, while the
page_increment is the larger one. The
page_size argument usually corresponds somehow to
the visible area of a panning widget. The upper argument
is used to represent the bottommost or rightmost coordinate in a panning
widget's child.
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| ToolPalette Example |  |
Using Adjustments the Easy Way |