Struct RefreshState 

pub struct RefreshState {

    pub columns: usize,
    pub lines: usize,
    pub vln: usize,
    pub vcs: usize,
    pub lpromptw: usize,
    pub rpromptw: usize,
    pub scrolloff: usize,
    pub region_highlight_start: Option<usize>,
    pub region_highlight_end: Option<usize>,
    pub old_video: Option<VideoBuffer>,
    pub new_video: Option<VideoBuffer>,
    pub lpromptbuf: String,
    pub rpromptbuf: String,
    pub need_full_redraw: bool,
    pub predisplay: String,
    pub postdisplay: String,
}

Composite of zle_refresh.c globals (winw/winh/vcs/vln/vmaxln, oldmax, lastrow, lastcol, more_status, etc.) collected into one struct. C uses separate file-statics per name (int winw, winh, vcs, vln, ...).

Fields

columns: usize

Number of columns.

lines: usize

Number of lines.

vln: usize

Current line on screen (cursor row).

vcs: usize

Current column on screen (cursor col).

lpromptw: usize

Prompt width (left).

rpromptw: usize

Right prompt width.

scrolloff: usize

Scroll offset for horizontal scrolling.

region_highlight_start: Option<usize>

Region highlight start.

region_highlight_end: Option<usize>

Region highlight end.

old_video: Option<VideoBuffer>

Old video buffer.

new_video: Option<VideoBuffer>

New video buffer.

lpromptbuf: String

Prompt string (left).

rpromptbuf: String

Right prompt string.

need_full_redraw: bool

Whether we need full redraw.

predisplay: String

Predisplay string (before main buffer).

postdisplay: String

Postdisplay string (after main buffer).

Implementations

impl RefreshState

pub fn new() -> RefreshState

Build the initial refresh state at zleread() entry. Equivalent to the global nbuf/obuf/vln/vcs allocation + reset performed by resetvideo() at Src/Zle/zle_refresh.c:725 — terminal size queried once, both video buffers allocated, need_full_redraw set so the first paint touches every cell.

pub fn reset_video(&mut self)

Reallocate the video buffers for the current terminal size and arm a full redraw on the next paint. Equivalent to resetvideo() from Src/Zle/zle_refresh.c:725 invoked after SIGWINCH (the C source calls it from adjustwinsize() in Src/init.c).

pub fn free_video(&mut self)

Drop both video buffers — used at ZLE shutdown. Equivalent to freevideo() from Src/Zle/zle_refresh.c:700.

pub fn swap_buffers(&mut self)

Promote the freshly-painted buffer to “previously displayed” and clear the new-buffer slate for the next frame. Equivalent to bufswap() from Src/Zle/zle_refresh.c:946 — the C source swaps nbuf and obuf pointers and zeroes the new nbuf so the diff loop has a clean target.

Trait Implementations

impl Clone for RefreshState

fn clone(&self) -> RefreshState

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for RefreshState

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Default for RefreshState

fn default() -> RefreshState

Returns the “default value” for a type.