feat: add new scrolloff option to [manager] (#679)

cspell.json

@@ -1 +1 @@
-{"version":"0.2","language":"en","flagWords":[],"words":["Punct","KEYMAP","splitn","crossterm","YAZI","unar","peekable","ratatui","syntect","pbpaste","pbcopy","ffmpegthumbnailer","oneshot","Posix","Lsar","XADDOS","zoxide","cands","Deque","precache","imageops","IFBLK","IFCHR","IFDIR","IFIFO","IFLNK","IFMT","IFSOCK","IRGRP","IROTH","IRUSR","ISGID","ISUID","ISVTX","IWGRP","IWOTH","IWUSR","IXGRP","IXOTH","IXUSR","libc","winsize","TIOCGWINSZ","xpixel","ypixel","ioerr","appender","Catppuccin","macchiato","gitmodules","Dotfiles","bashprofile","vimrc","flac","webp","exiftool","mediainfo","ripgrep","nvim","indexmap","indexmap","unwatch","canonicalize","serde","fsevent","Ueberzug","iterm","wezterm","sixel","chafa","ueberzugpp","️ Überzug","️ Überzug","Konsole","Alacritty","Überzug","pkgs","paru","unarchiver","pdftoppm","poppler","prebuild","singlefile","jpegopt","EXIF","rustfmt","mktemp","nanos","xclip","xsel","natord","Mintty","nixos","nixpkgs","SIGTSTP","SIGCONT","SIGCONT","mlua","nonstatic","userdata","metatable","natsort","backstack","luajit","Succ","Succ","cand","fileencoding","foldmethod","lightgreen","darkgray","lightred","lightyellow","lightcyan","nushell","msvc","aarch","linemode","sxyazi","rsplit","ZELLIJ","bitflags","bitflags","USERPROFILE","Neovim","vergen","gitcl","Renderable","preloaders","prec","imagesize","Upserting","prio","Ghostty","Catmull","Lanczos","cmds","unyank"]}
+{"language":"en","flagWords":[],"version":"0.2","words":["Punct","KEYMAP","splitn","crossterm","YAZI","unar","peekable","ratatui","syntect","pbpaste","pbcopy","ffmpegthumbnailer","oneshot","Posix","Lsar","XADDOS","zoxide","cands","Deque","precache","imageops","IFBLK","IFCHR","IFDIR","IFIFO","IFLNK","IFMT","IFSOCK","IRGRP","IROTH","IRUSR","ISGID","ISUID","ISVTX","IWGRP","IWOTH","IWUSR","IXGRP","IXOTH","IXUSR","libc","winsize","TIOCGWINSZ","xpixel","ypixel","ioerr","appender","Catppuccin","macchiato","gitmodules","Dotfiles","bashprofile","vimrc","flac","webp","exiftool","mediainfo","ripgrep","nvim","indexmap","indexmap","unwatch","canonicalize","serde","fsevent","Ueberzug","iterm","wezterm","sixel","chafa","ueberzugpp","️ Überzug","️ Überzug","Konsole","Alacritty","Überzug","pkgs","paru","unarchiver","pdftoppm","poppler","prebuild","singlefile","jpegopt","EXIF","rustfmt","mktemp","nanos","xclip","xsel","natord","Mintty","nixos","nixpkgs","SIGTSTP","SIGCONT","SIGCONT","mlua","nonstatic","userdata","metatable","natsort","backstack","luajit","Succ","Succ","cand","fileencoding","foldmethod","lightgreen","darkgray","lightred","lightyellow","lightcyan","nushell","msvc","aarch","linemode","sxyazi","rsplit","ZELLIJ","bitflags","bitflags","USERPROFILE","Neovim","vergen","gitcl","Renderable","preloaders","prec","imagesize","Upserting","prio","Ghostty","Catmull","Lanczos","cmds","unyank","scrolloff"]}

yazi-config/preset/yazi.toml

@@ -11,6 +11,7 @@ sort_dir_first = false
 linemode       = "none"
 show_hidden    = false
 show_symlink   = true
+scrolloff      = 5
 
 [preview]
 tab_size        = 2

yazi-config/src/manager/manager.rs

@@ -19,6 +19,7 @@ pub struct Manager {
 	pub linemode:     String,
 	pub show_hidden:  bool,
 	pub show_symlink: bool,
+	pub scrolloff:    u8,
 }
 
 impl Default for Manager {

yazi-core/src/folder/folder.rs

@@ -1,7 +1,7 @@
 use std::{mem, time::SystemTime};
 
 use ratatui::layout::Rect;
-use yazi_config::LAYOUT;
+use yazi_config::{LAYOUT, MANAGER};
 use yazi_shared::fs::{File, FilesOp, Url};
 
 use super::FolderStage;
@@ -108,8 +108,10 @@ impl Folder {
 		let len = self.files.len();
 
 		let limit = LAYOUT.load().current.height as usize;
+		let scrolloff = (limit / 2).min(MANAGER.scrolloff as usize);
+
 		self.cursor = step.add(self.cursor, limit).min(len.saturating_sub(1));
-		self.offset = if self.cursor >= (self.offset + limit).min(len).saturating_sub(5) {
+		self.offset = if self.cursor >= (self.offset + limit).min(len).saturating_sub(scrolloff) {
 			len.saturating_sub(limit).min(self.offset + self.cursor - old.0)
 		} else {
 			self.offset.min(len.saturating_sub(1))
@@ -122,8 +124,11 @@ impl Folder {
 		let old = (self.cursor, self.offset);
 		let max = self.files.len().saturating_sub(1);
 
-		self.cursor = step.add(self.cursor, LAYOUT.load().current.height as usize).min(max);
-		self.offset = if self.cursor < self.offset + 5 {
+		let limit = LAYOUT.load().current.height as usize;
+		let scrolloff = (limit / 2).min(MANAGER.scrolloff as usize);
+
+		self.cursor = step.add(self.cursor, limit).min(max);
+		self.offset = if self.cursor < self.offset + scrolloff {
 			self.offset.saturating_sub(old.0 - self.cursor)
 		} else {
 			self.offset.min(max)