Struct HelpApp 

pub struct HelpApp {
    pub active_tab: usize,
    pub tab_count: usize,
    pub total_lines: usize,
    /* private fields */
}

HelpApp 状态

Fields

active_tab: usize

tab_count: usize

total_lines: usize

当前 Tab 的总渲染行数（用于滚动限制）

Implementations

impl HelpApp

pub fn new() -> Self

pub fn tab_name(&self, idx: usize) -> &str

pub fn theme(&self) -> &Theme

pub fn current_tab_lines(&mut self, content_width: usize) -> &[Line<'static>]

获取当前 Tab 的渲染行（带缓存）

pub fn scroll_offset(&self) -> usize

pub fn next_tab(&mut self)

pub fn prev_tab(&mut self)

pub fn goto_tab(&mut self, idx: usize)

pub fn scroll_down(&mut self, n: usize)

pub fn scroll_up(&mut self, n: usize)

pub fn scroll_to_top(&mut self)

pub fn scroll_to_bottom(&mut self)

pub fn invalidate_cache(&mut self)

pub fn clamp_scroll(&mut self, visible_height: usize)

钳制滚动偏移（在 draw 后调用，确保不超出内容范围）