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Improve the documentation of scaling factor-related operations.

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git-svn-id: file:///fltk/svn/fltk/branches/branch-1.4@13013 ea41ed52-d2ee-0310-a9c1-e6b18d33e121
This commit is contained in:
Manolo Gouy 2018-08-09 11:51:38 +00:00
parent 1dd21622f5
commit a9e2a78bb0
1 changed files with 10 additions and 5 deletions

15
FL/Fl.H

@ -993,13 +993,18 @@ int main() {
/** \defgroup fl_screen Screen functions
fl global screen functions declared in <FL/Fl.H>.
Fl global screen functions declared in <FL/Fl.H>.
FLTK supports high-DPI screens using a screen scaling factor.
The scaling factor value can be changed by typing ctrl-/+/-/0/
(cmd-/+/-/0/ under MacOS). FLTK sends the FL_ZOOM_EVENT when the
factor value is changed, to which a callback can be associated with Fl::add_handler().
The scaling factor is initialized by the library to a value
based on information obtained from the OS. If this initial value
is not satisfactory, the FLTK_SCALING_FACTOR environment variable
can be set to a value FLTK will use as initial scaling factor.
The scaling factor value can be further changed at runtime
by typing ctrl-/+/-/0/ (cmd-/+/-/0/ under MacOS). FLTK sends the
\ref FL_ZOOM_EVENT when the factor value is changed, to which a
callback can be associated with Fl::add_handler().
By default, FLTK also displays the new scaling factor value in a yellow, transient window.
This can be changed with Fl::option(OPTION_SHOW_SCALING, 0).
This can be changed with option Fl::OPTION_SHOW_SCALING.
The scaling factor value is programmatically get and set with the Fl::screen_scale() functions.
@{ */