Struct ProgressBar 

pub struct ProgressBar { /* private fields */ }

A progress bar using Unicode 8-segment block characters.

Displays a bar of width cells filled to ratio (0.0–1.0). Purely visual — not focusable, no keyboard interaction. Combine with #[reactive] and Event::Tick for animated progress.

Implementations

impl ProgressBar

pub fn new() -> Self

Creates a new progress bar at 0%, 20 cells wide.

pub fn label(self, show: bool) -> Self

Builder: shows a percentage label (e.g. “75%”).

pub fn ratio(self, ratio: f64) -> Self

Builder: sets the fill ratio (0.0–1.0).

pub fn width(self, width: u16) -> Self

Builder: sets the bar width in character cells.

pub fn style(self, style: Style) -> Self

Builder: sets the filled-portion style.

pub fn track_style(self, style: Style) -> Self

Builder: sets the unfilled-portion (track) style.

pub fn set_ratio(&mut self, ratio: f64, cx: &mut EventCx<'_>)

Sets the fill ratio and marks paint dirty.

Trait Implementations

impl Component for ProgressBar

fn render(&self, cx: &mut RenderCx<'_>)

渲染组件内容

fn measure(&self, _constraint: Constraint, _cx: &mut MeasureCx) -> Size

测量组件在给定约束下的自适应尺寸

fn event(&mut self, _event: &Event, _cx: &mut EventCx<'_>)

处理事件（可选实现）

fn layout(&mut self, _rect: Rect, _cx: &mut LayoutCx<'_>)

布局回调——组件在此计算子节点 rect 并调用 child.layout()

fn focusable(&self) -> bool

是否可聚焦（Tab 导航会跳过不可聚焦的组件）

fn style(&self) -> Style

返回组件样式（可选实现）

fn mount(&mut self, _cx: &mut EventCx<'_>)

首次挂载（初始化后调用）

fn unmount(&mut self, _cx: &mut EventCx<'_>)

从树卸载（退出前调用）

fn update(&mut self, _cx: &mut EventCx<'_>)

每次事件分发前调用

fn type_name(&self) -> &str

组件类型名（用于样式表类型选择器匹配）

fn id(&self) -> Option<&str>

组件 ID（用于样式表 #id 选择器匹配）

fn class(&self) -> Option<&str>

组件 class（用于样式表 .class 选择器匹配）

fn for_each_child(&self, _f: &mut dyn FnMut(&Node))

遍历子节点（为焦点系统等提供统一的树遍历接口）

fn for_each_child_mut(&mut self, _f: &mut dyn FnMut(&mut Node))

遍历子节点（可变版本）