pushparaj muthu wrote:
Hi Albrecht
[...]
How to find out how many lines displayed without scrolling
and fill Fl_Text_Buffer only with given ( some x value ) the number of lines
.
Regards
Pushparaj.M
I'm afraid we can't write your program. Please try yourself, and ask
precise questions, if you don't succeed. For a start, I'll append a
small example program that does something you asked for ... :-)
Albrecht
// Fill Fl_Text_Display with text (page by page)
// compile with fltk-config --compile text_buf.cxx
#include <stdio.h>
#include <FL/Fl.H>
#include <FL/Fl_Double_Window.H>
#include <FL/Fl_Text_Display.H>
#include <FL/Fl_Text_Buffer.H>
#include <FL/Fl_Button.H>
Fl_Text_Display *td = 0;
Fl_Text_Buffer *tb = 0;
int nline = 0;
void next_cb(Fl_Widget *w, void *data)
{
char tbuf[120];
// calculate displayable lines (approximately)
int lines = td->h()/td->textsize()-2;
// clear text buffer and fill it with n lines
tb->text(""); // clear buffer
for (int i=0; i<lines; i++) {
sprintf (tbuf,"This is line number %d ...\n",++nline);
tb->append(tbuf);
}
td->redraw();
}
int main() {
Fl_Window win(600, 600);
td = new Fl_Text_Display(10,10,580,500);
td->textsize(20);
td->textfont(FL_COURIER);
Fl_Button *b = new Fl_Button(20,530,60,30,"Next");
b->callback(next_cb);
win.end();
tb = new Fl_Text_Buffer();
td->buffer(tb);
next_cb(b,(void *)0); // fill buffer
win.show();
return(Fl::run());
}
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