feat(app-iced): M84 页面骨架与布局系统（断点 / 行宽上限 / 三种版面）
视觉复审在 M68 的判词是不能把「全宽单卡」当页面模板（1180 宽下正文单行 712px ≈ 118 字符）。 本 mission 把它落成一套**布局系统**，四个页面只是它的用例： - `pages/layout.rs`：官方 600 / 840 两个档位 → 三种版面（单列 / supporting-pane / list-detail）， 阈值由列宽和算出（设置 240+24+320 → 720；实例 336+24+320 → 816 ≤ 840），行宽硬上限 14 × 0.5em × 72 = **504px**，全部是纯函数，`pages/layout/tests.rs` 用绝对值和边界表钉死。 - `pages/frame.rs`：页头（56 / 两行 84）+ 内容列（≤504）+ 两列骨架 + 空态位； `pages/frame/pieces.rs` 是占位控件（卡片 / 分隔线 / 文本按钮 / 图标），令牌驱动、无完整状态机， 待 M75 的 components 家族合入后替换。 - 四页：实例（list-detail，列表列 336 独立滚动，窄窗退化成整页切换）、 设置（supporting-pane，240 分组导航 + ≤504 表单列）、下载 / 日志（单列，两行页头）。 - `pages/harness.rs` + `examples/pages_demo.rs`：自带 `--screen/--width/--screenshot-theme`， 不碰 `cli.rs` / `app.rs`（M75 在改）。 偏离与说明： - 布局用「页边距 16/24」而非 16/24/32，官方 expanded 也是 24（少一条偏离登记）； - 实例空详情态一屏会有 5 档字号（22/16/24/12 + 14 的操作按钮），未截图的状态，已知并登记； - `lib.rs` 只加一行 `pub mod pages;`。
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//! 页面用的**占位控件**：卡片 / 分隔线 / 空态 / 文本按钮 / 图标 / 容器样式。
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//!
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//! 全部走令牌（颜色、圆角、排版、间距、一像素线），但**没有完整状态机**——
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//! 这些是给页面骨架站稳版式用的临时件，M74/M75 的 `components/` 家族合入后由另一条 mission 替换。
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//! 每个函数都在文档里点明它对应哪个组件的档位（12b 的参考值）。
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use iced::widget::text::LineHeight;
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use iced::widget::{button, column, container, row, rule, scrollable, space, svg};
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use iced::Theme as IcedTheme;
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use iced::{Alignment, Background, Border, Color, Element, Length, Padding, Pixels, Shadow};
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use unlucky_design::color::{Role, StateLayer};
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use unlucky_design::component_map::Component;
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use unlucky_design::elevation::MaterialLayer;
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use unlucky_design::icons::{IconKind, IconPaint};
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use unlucky_design::shape::ShapeScale;
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use unlucky_design::spacing::Space;
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use unlucky_design::typography::{TypeRole, TypeStyle};
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use crate::icons;
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use crate::pages::{Action, Message};
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use crate::theme::Ui;
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/// 空态图标块边长（12b 15.1：96×96，圆角 `Large`）。
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pub(super) const EMPTY_ICON_BLOCK: f32 = 96.0;
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/// 空态字形渲染尺寸（12b 15.1：图标 32~48 `[估]`，取 40）。
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pub(super) const EMPTY_ICON_GLYPH: f32 = 40.0;
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/// 滚动条宽度（iced 默认 10px 的令牌化名字，用于把滑块做成药丸）。
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const SCROLLBAR_TRACK: f32 = 10.0;
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/// 描边卡片（占位：M75 的 `components` 会提供真正的 `OutlinedCard`）。
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pub fn card<'a>(ui: &'a Ui, content: impl Into<Element<'a, Message>>) -> Element<'a, Message> {
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let spec = Component::OutlinedCard.spec();
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container(content)
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.width(Length::Fill)
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.padding(ui.metrics().card_padding)
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.style(move |_theme| container::Style {
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background: Some(Background::Color(ui.layer(MaterialLayer::Card))),
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border: ui.outlined(spec.shape),
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..container::Style::default()
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})
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.into()
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}
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/// 一像素分隔线（`OutlineVariant`，厚度取令牌）。
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pub fn divider<'a>(ui: &'a Ui) -> Element<'a, Message> {
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rule::horizontal::<IcedTheme>(ui.metrics().divider_thickness)
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.style(move |_theme| rule::Style {
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color: ui.color(Role::OutlineVariant),
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radius: ui.radius_dp(ShapeScale::None),
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fill_mode: rule::FillMode::Full,
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snap: true,
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})
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.into()
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}
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/// 空态（12b §15）：图标块 96 + 24 标题 + 12 副文案 + ≤3 个快捷入口，**整块垂直居中**。
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pub fn empty_state<'a>(
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ui: &'a Ui,
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icon: IconKind,
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title: &'a str,
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body: &'a str,
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actions: Vec<Element<'a, Message>>,
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) -> Element<'a, Message> {
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let spec = Component::EmptyState.spec();
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let block = container(glyph(
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icon,
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ui.color(Role::OnSurfaceVariant),
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EMPTY_ICON_GLYPH,
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))
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.width(EMPTY_ICON_BLOCK)
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.height(EMPTY_ICON_BLOCK)
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.align_x(Alignment::Center)
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.align_y(Alignment::Center)
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.style(move |_theme| container::Style {
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background: Some(Background::Color(ui.color(Role::SurfaceContainerHigh))),
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border: Border {
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radius: ui.radius_dp(spec.shape),
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..Border::default()
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},
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..container::Style::default()
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});
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let mut stack = column![
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block,
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text_role_centered(ui, spec.text, false, title, ui.color(Role::OnSurface)),
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text_role_centered(
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ui,
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spec.support.unwrap_or(TypeRole::BodySmall),
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false,
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body,
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ui.color(Role::OnSurfaceVariant),
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),
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]
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.spacing(ui.space(Space::X3))
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.align_x(Alignment::Center);
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if !actions.is_empty() {
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stack = stack.push(
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row(actions)
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.spacing(ui.space(Space::X2))
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.align_y(Alignment::Center),
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);
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}
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container(stack)
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.width(Length::Fill)
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.height(Length::Fill)
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.align_x(Alignment::Center)
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.align_y(Alignment::Center)
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.into()
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}
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/// 文本按钮占位（TextButton 档：透明底、`OnSurfaceVariant`、40 高、full 圆角）。
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///
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/// 只画静息、hover、pressed 三态（focus/disabled 归 M75 的 `interaction.rs`）；
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/// 消息是页面自己的 [`Message::Action`]，与 app 的 `Message` 完全解耦。
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pub fn text_action<'a>(ui: &'a Ui, label: &'a str, action: Action) -> Element<'a, Message> {
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let spec = Component::TextButton.spec();
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let height = ui.metrics().control_height;
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let content = text_role(
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ui,
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spec.text,
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false,
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label,
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ui.color(Role::OnSurfaceVariant),
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);
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button(container(content).align_y(Alignment::Center))
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.height(height)
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.padding(Padding::from([0.0, ui.space(Space::X4)]))
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.style(move |_theme: &IcedTheme, status| {
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let background = match status {
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button::Status::Hovered => Some(Background::Color(ui.state_over(
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StateLayer::Hover,
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Role::OnSurface,
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Role::Surface,
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))),
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button::Status::Pressed => Some(Background::Color(ui.state_over(
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StateLayer::Pressed,
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Role::OnSurface,
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Role::Surface,
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))),
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button::Status::Active | button::Status::Disabled => None,
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};
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button::Style {
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background,
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text_color: ui.color(Role::OnSurfaceVariant),
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border: Border {
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radius: ui.radius(ShapeScale::Full, height),
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..Border::default()
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},
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shadow: Shadow::default(),
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snap: true,
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}
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})
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.on_press(Message::Action(action))
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.into()
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}
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/// 令牌排版档 → 文字元素（字号 / 行高 / 字重全来自令牌，不写字面量）。
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pub fn text_role<'a>(
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ui: &'a Ui,
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role: TypeRole,
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emphasized: bool,
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content: &'a str,
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color: Color,
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) -> Element<'a, Message> {
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text_widget(ui, role, emphasized, content, color).into()
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}
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/// 同 [`text_role`]，但**文字自身居中**（空态的标题与副文案：图标块是居中锚点）。
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pub fn text_role_centered<'a>(
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ui: &'a Ui,
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role: TypeRole,
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emphasized: bool,
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content: &'a str,
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color: Color,
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) -> Element<'a, Message> {
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text_widget(ui, role, emphasized, content, color)
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.align_x(iced::widget::text::Alignment::Center)
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.into()
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}
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fn text_widget<'a>(
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ui: &'a Ui,
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role: TypeRole,
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emphasized: bool,
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content: &'a str,
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color: Color,
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) -> iced::widget::Text<'a> {
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let style: TypeStyle = if emphasized {
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ui.emphasized(role)
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} else {
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ui.style(role)
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};
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iced::widget::text(content)
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.size(style.size_px)
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.line_height(LineHeight::Absolute(Pixels(style.line_height_px)))
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.font(ui.font_of(style))
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.color(color)
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}
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/// 任意尺寸的令牌图标（`icons::RENDER_PX` 只有 24 一档；空态图标要 40）。
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///
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/// 描边宽度仍按令牌的 `Icon::stroke_width(render_px)` 折算，所以视觉线宽在任何尺寸下都是 1.5。
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pub fn glyph(kind: IconKind, color: Color, render_px: f32) -> Element<'static, Message> {
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let icon = kind.icon();
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let paint = match icon.paint {
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IconPaint::Stroke => format!(
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"fill=\"none\" stroke=\"currentColor\" stroke-width=\"{}\" \
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stroke-linecap=\"round\" stroke-linejoin=\"round\"",
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icon.stroke_width(render_px)
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),
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IconPaint::Fill => "fill=\"currentColor\" stroke=\"none\"".to_owned(),
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};
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let source = format!(
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"<svg xmlns=\"http://www.w3.org/2000/svg\" width=\"{0}\" height=\"{0}\" \
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viewBox=\"0 0 24 24\"><path d=\"{1}\" {paint}/></svg>",
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render_px, icon.path
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);
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svg(svg::Handle::from_memory(source.into_bytes()))
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.width(render_px)
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.height(render_px)
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.style(move |_theme, _status| svg::Style { color: Some(color) })
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.into()
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}
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/// 固定宽 × 固定高的图标容器（Q9：按钮给的 Fill 约束会撑大字形，必须中间夹一层）。
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pub fn glyph_box(kind: IconKind, color: Color, px: f32) -> Element<'static, Message> {
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container(glyph(kind, color, px))
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.width(px)
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.height(px)
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.align_x(Alignment::Center)
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.align_y(Alignment::Center)
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.into()
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}
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/// 竖直留白（布局拼装用；值来自令牌栅格）。
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pub fn gap<'a>(px: f32) -> Element<'a, Message> {
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space::vertical().height(px).into()
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}
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/// 纯色容器样式（页面底色 / 留白带）。
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pub fn filled(color: Color) -> container::Style {
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container::Style {
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background: Some(Background::Color(color)),
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..container::Style::default()
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}
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}
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/// 滚动条配色（令牌角色）：轨道透明，滑块 `Outline`，尺寸取 iced 默认。
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///
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/// 只在**独立滚动区**上挂（实例页列表列），不许挂到整页上——整页滚动会把页头一起滚走。
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pub fn scroll_style(ui: &Ui) -> impl Fn(&IcedTheme, scrollable::Status) -> scrollable::Style + '_ {
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let rail = scrollable::Rail {
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background: None,
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border: Border::default(),
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scroller: scrollable::Scroller {
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background: Background::Color(ui.color(Role::Outline)),
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border: Border {
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radius: ui.radius(ShapeScale::Full, SCROLLBAR_TRACK),
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..Border::default()
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},
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},
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};
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move |_theme, _status| scrollable::Style {
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container: container::Style::default(),
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vertical_rail: rail,
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horizontal_rail: rail,
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gap: None,
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auto_scroll: scrollable::AutoScroll {
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background: Background::Color(ui.color(Role::SurfaceContainerHigh)),
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border: Border::default(),
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shadow: Shadow::default(),
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icon: ui.color(Role::OnSurfaceVariant),
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},
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}
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}
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/// `crate::icons::RENDER_PX` 的再导出（页面里 24px 图标走这个常量，不写字面量）。
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pub const ICON_PX: f32 = icons::RENDER_PX;
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/// 小号图标（行尾 chevron 之类的辅助指示，16px）。
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pub const ICON_SMALL_PX: f32 = 16.0;
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