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Some docs for printing asynchronously.

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This commit is contained in:
Matthias Melcher 2022-05-31 17:23:16 +02:00
parent 23d0a631cf
commit bcbdf5546f
1 changed files with 14 additions and 0 deletions
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14
src/Fl_Paged_Device.cxx
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@ -41,6 +41,14 @@ int Fl_Paged_Device::begin_job(int pagecount, int *frompage, int *topage, char *
The page coordinates are initially in points, i.e., 1/72 inch, The page coordinates are initially in points, i.e., 1/72 inch,
and with origin at the top left of the printable page area. and with origin at the top left of the printable page area.
This function also makes this surface the current drawing surface with Fl_Surface_Device::push_current(). This function also makes this surface the current drawing surface with Fl_Surface_Device::push_current().
\note begin_page() calls Fl_Surface_Device::push_current() and leaves this
device as the active surface. If any calls between begin_page() and end_page()
open dialog boxes or will otherwise draw into FLTK windows, those calls must
be put between a call to Fl_Surface_Device::pop_current()
and a call to Fl_Surface_Device::push_current(), or the content of the dialog
box will be rendered to the printer instead of the screen.
\return 0 if OK, non-zero if any error \return 0 if OK, non-zero if any error
*/ */
int Fl_Paged_Device::begin_page (void) {return 1;} int Fl_Paged_Device::begin_page (void) {return 1;}
@ -85,6 +93,12 @@ void Fl_Paged_Device::rotate(float angle) {}
\brief To be called at the end of each page. \brief To be called at the end of each page.
This function also stops this surface from being the current drawing surface with Fl_Surface_Device::pop_current(). This function also stops this surface from being the current drawing surface with Fl_Surface_Device::pop_current().
\note end_page() calls Fl_Surface_Device::pop_current().
If any calls between begin_page() and end_page()
open dialog boxes or will otherwise draw into FLTK windows, those calls must
be put between a call to Fl_Surface_Device::pop_current()
and a call to Fl_Surface_Device::push_current().
\return 0 if OK, non-zero if any error. \return 0 if OK, non-zero if any error.
*/ */
int Fl_Paged_Device::end_page (void) {return 1;} int Fl_Paged_Device::end_page (void) {return 1;}