From 87dcfa6edd43316068347ff5b8f23c76bdc7b472 Mon Sep 17 00:00:00 2001 From: Marc Coquand Date: Thu, 30 May 2024 10:04:25 -0500 Subject: Add half-screen down/up scrolling --- lib/headlines.ml | 18 ++++++++++++------ 1 file changed, 12 insertions(+), 6 deletions(-) (limited to 'lib/headlines.ml') diff --git a/lib/headlines.ml b/lib/headlines.ml index b8303c0..97eab20 100644 --- a/lib/headlines.ml +++ b/lib/headlines.ml @@ -93,13 +93,15 @@ let rec render in Common.Term.image t img; let content_end = Array.length content_pretty + (content_start - 1) in - let scroll_up () = - let scroll = if y - content_start - scroll = 0 then max (scroll - 1) 0 else scroll in - render t { state with pos = x, max (y - 1) content_start; scroll; output = None } + let scroll_up ?(amount = 1) () = + let scroll = + if y - content_start - scroll - amount < 0 then max (scroll - amount) 0 else scroll + in + render t { state with pos = x, max (y - amount) content_start; scroll; output = None } in - let scroll_down () = - let scroll = if y - scroll >= size_y - 1 then scroll + 1 else scroll in - render t { state with pos = x, min (y + 1) content_end; scroll; output = None } + let scroll_down ?(amount = 1) () = + let scroll = if y - scroll >= size_y - amount then scroll + amount else scroll in + render t { state with pos = x, min (y + amount) content_end; scroll; output = None } in match Common.Term.event t with | `End | `Key (`Escape, []) | `Key (`ASCII 'q', []) | `Key (`ASCII 'C', [ `Ctrl ]) -> () @@ -189,6 +191,10 @@ let rec render } in Input_prompt.render t input_state + | `Key (`ASCII 'D', [ `Ctrl ]) | `Key (`Page `Down, []) -> + scroll_down ~amount:(size_y / 2) () + | `Key (`ASCII 'U', [ `Ctrl ]) | `Key (`Page `Up, []) -> + scroll_up ~amount:(size_y / 2) () | `Key (`ASCII 'j', []) | `Key (`ASCII 'N', [ `Ctrl ]) -> scroll_down () | `Key (`ASCII 'k', []) | `Key (`ASCII 'P', [ `Ctrl ]) -> scroll_up () | `Key (`Arrow d, _) -> -- cgit v1.2.3