GtkProgress::set_format_string
The content of the progress text can be modified with the format string. It can contain the following format characters:
The % character itself can be specified as
%%.
The default text string is "%p%%".
See also: GtkAdjustment, where the progress value and bounds are set.
忘却曲線を使ってこの知識を確実に記憶に残す
