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There is a keybinding in Emacs that lets you scroll in another window that you're not currently working on (C-M-v to scroll-other-window-down and C-M-V to scroll-other-window-up). For example, in a horizontal split, while you're writing in the upper window, you can scroll the view of the bottom window without switching to that window. I'm curious whether there is a similar keybinding for that in Vim or if it's not natively there, how can we add a similar feature.

5

scroll the view of the bottom window without switching to that window

Something like this

call win_execute(win_getid(winnr('j')), "normal! \<C-E>")

winnr('j') returns Window number of a window below the current one. win_getid() translates Window number to :h winid. Then win_execute() runs an arbitrary command as if that window were active (but display is not updated, and auto-commands are not triggered).

Note: win_execute() is not available in Neovim.

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  • This answer is very educational and useful. I just wonder how can I modify win_getid(winner('j')) to tell him to do something on the other window assuming there are only two. The other window could be on the right, left, up, or down. Can I generalize it like that? – Saeed Ahadian Jul 25 at 11:22
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    From :h winnr(), I can see you can use # (last window used) in place of j. – Biggybi Jul 25 at 11:38
  • @Biggybi I saw that, too. But the last window is not always the other window in the same tab. I might switch between tabs and I guess using this command would not point me to the other window in the same tab but the window back in the tab I switched from. – Saeed Ahadian Jul 25 at 11:48
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    @Biggybi My bad! You're 100% right. I just checked out that command in action and it works right, even if I just switch from another window in another tab. Looks like tabs are separate environments in Vim. – Saeed Ahadian Jul 25 at 11:57
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    @SaeedAhadian There are "window IDs" and "window numbers". Both are used here. Window ID is a unique number for a whole Vim session (1000+); while "window number" is basically "a window position within tab" (1, 2, 3 etc.). – Matt Jul 25 at 13:30
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I use the mouse for this. With set mouse=a I can scroll any open window from any mode (including normal mode). It’s not the purest solution, but it works very well for me.

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2

Assuming you have 2 windows. Then map like this in your .vimrc:

map <F11> <C-W><C-W><C-D><C-W><C-W>

It will map F11 to do these actions:

  1. <C-W><C-W> - move cursor to second window.
  2. <C-D> - scroll second window downwards half of screen.
  3. <C-W><C-W> - move cursor back to first window.

Change part 2 to whatever you want, look at :h scroll.txt to see more commands. For example, <C-U> scrolls half screen upward. <C-E>, <C-Y> scroll one line.

See:

:h CTRL-W_CTRL-W  
:h windows.txt  
:h scroll.txt
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