Page up/down and keep cursor position
From Vim Tips Wiki
created 2002 · complexity basic · author Simon "neoneye" Strandgaard · version 6.0
Borland behaviour = the cursor keeps the same xy position during pageup/down.
I'm new to Vim scripting, im sure it can be done smarter?
I read VimTip105 and it gave me a clue of how BorlandPageUp/Down could be done.
" i could'nt find any get_number_of_visible_lines function, so i made my own. function GetNumberOfVisibleLines() let cur_line = line(".") let cur_col = virtcol(".") normal H let top_line = line(".") normal L let bot_line = line(".") execute "normal " . cur_line . "G" execute "normal " . cur_col . "|" return bot_line - top_line endfunc " noremap <PageUp> 39<C-U>:set scroll=0<CR> function! MyPageUp() let visible_lines = GetNumberOfVisibleLines() execute "normal " . visible_lines . "\<C-U>:set scroll=0\r" endfunction " noremap <PageDown> 39<C-D>:set scroll=0<CR> function! MyPageDown() let visible_lines = GetNumberOfVisibleLines() execute "normal " . visible_lines . "\<C-D>:set scroll=0\r" endfunction " BorlandPascal pageup/down behaviour! " todo: when hitting top/bottom of file, then restore Y to lastY noremap <PageUp> :call MyPageUp()<CR> noremap <PageDown> :call MyPageDown()<CR>
For maintaining the same x coordinate, :help 'startofline'.
And CTRL-U (up), CTRL-D (down) may also be useful for what you want (half page scrolls)
A solution that I use (easier, I would say, but has a small side-effect) is this:
map <PageDown> :set scroll=0<CR>:set scroll^=2<CR>:set scroll-=1<CR><C-D>:set scroll=0<CR> map <PageUp> :set scroll=0<CR>:set scroll^=2<CR>:set scroll-=1<CR><C-U>:set scroll=0<CR>
I found Vim's normal PgUp/PgDn behaviour weird - I think it's different from every other editor I've used and I was unable to get used to it. The above two lines are godsent!
Ditto on the above two lines. They work exactly as I want! (SRS)
See Combining move and scroll. You might find it useful to incorporate the improvements into this tip.
A solution that works in insert and visual modes too:
nnoremap <silent> <PageUp> <C-U><C-U> vnoremap <silent> <PageUp> <C-U><C-U> inoremap <silent> <PageUp> <C-\><C-O><C-U><C-\><C-O><C-U> nnoremap <silent> <PageDown> <C-D><C-D> vnoremap <silent> <PageDown> <C-D><C-D> inoremap <silent> <PageDown> <C-\><C-O><C-D><C-\><C-O><C-D>
It assumes that "scroll" has its default value. Also there is an intermediate redraw, but that could be perceived as a feature, really.
I've spent a whole day trying to simulate sometheing like the <C-\><C-O> command for Visual mode (hoping for the universal solution -- a way to call any normal mode command from any mode), yet it looks like impossible if the command in question is supposed to be a custom movement command, modifying selection.