forked from 1b-agent/opencadstudio-upstream
Karim Jerbi
a9fda66ac0
- Add 'i ' prefix to EntryKind::Info and coordinate set_step_prompt deduplication to satisfy WCAG 1.4.1 across all 22 themes - Drop unused _desk parameter from crosshair_background and clean up its call sites - Document AutoCAD-standard context-based crosshair drafting surface architecture in crosshair_background - Add doc comments documenting deliberate alpha omission in canvas_is_light and backlog scope in is_wide
109 lines
4.2 KiB
Rust
109 lines
4.2 KiB
Rust
//! Style helpers shared across the style windows.
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//!
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//! Centralizes `muted_style` (and its alias `muted_text_style`) which were
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//! previously duplicated in 7 style files with byte-identical bodies (alpha
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//! 0.68). A single source ensures a theme change updates one place.
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//!
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//! **`btn_s` is intentionally NOT deduped here.** The two `btn_s` locals
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//! (`plotstyle.rs:41` and `style_manager.rs:299`) have divergent bodies:
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//! `style_manager` handles `Status::Disabled` (text alpha 0.45) while
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//! `plotstyle` does not. Unifying them would silently change the plotstyle
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//! disabled appearance. See `cargo test --lib ui::style::common_tests`.
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use iced::{Color, Theme};
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/// Muted secondary text style — `background.base.text` at 68% opacity.
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pub(crate) fn muted_style(theme: &Theme) -> iced::widget::text::Style {
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iced::widget::text::Style {
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color: Some(theme.palette().background.base.text.scale_alpha(0.68)),
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}
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}
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/// Alias for call sites that used `muted_text_style` (e.g. `style_manager`).
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/// Same implementation as [`muted_style`]; provided so existing imports
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/// can be unified without renaming at the call site.
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#[allow(dead_code)]
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pub(crate) fn muted_text_style(theme: &Theme) -> iced::widget::text::Style {
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muted_style(theme)
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}
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/// Convert sRGB channel [0.0, 1.0] to linear light for WCAG luminance calculations.
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pub(crate) fn to_linear(c: f32) -> f32 {
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if c <= 0.04045 {
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c / 12.92
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} else {
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((c + 0.055) / 1.055).powf(2.4)
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}
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}
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/// Calculate standard WCAG 2.1 relative luminance for an opaque color.
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pub(crate) fn wcag_luminance(color: Color) -> f32 {
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0.2126 * to_linear(color.r) + 0.7152 * to_linear(color.g) + 0.0722 * to_linear(color.b)
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}
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/// Calculate standard WCAG contrast ratio between two colors (range: 1.0 to 21.0).
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pub(crate) fn wcag_contrast(c1: Color, c2: Color) -> f32 {
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let l1 = wcag_luminance(c1);
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let l2 = wcag_luminance(c2);
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(l1.max(l2) + 0.05) / (l1.min(l2) + 0.05)
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}
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/// Returns `accent` if it achieves at least `min_contrast` against `bg`,
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/// otherwise safely falls back to `fallback`.
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pub(crate) fn accessible_accent_threshold(
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accent: Color,
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bg: Color,
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fallback: Color,
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min_contrast: f32,
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) -> Color {
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if wcag_contrast(accent, bg) >= min_contrast {
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accent
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} else {
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fallback
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}
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}
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/// Returns `accent` if it achieves at least 3.0:1 contrast against `bg` (WCAG 1.4.11 for UI components),
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/// otherwise safely falls back to `fallback`.
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pub(crate) fn accessible_accent(accent: Color, bg: Color, fallback: Color) -> Color {
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accessible_accent_threshold(accent, bg, fallback, 3.0)
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}
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/// Returns true if the given canvas background color has a WCAG relative luminance > 0.5 (light surface).
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/// Ignores alpha assuming canvas backgrounds are opaque (or composited against default viewport clear).
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pub(crate) fn canvas_is_light(bg: [f32; 4]) -> bool {
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wcag_luminance(Color::from_rgb(bg[0], bg[1], bg[2])) > 0.5
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}
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/// True if a character is East Asian Wide or Fullwidth (CJK ideographs, kana, hangul, fullwidth forms).
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/// Approximation of East Asian Wide/Fullwidth; not exhaustive (e.g. emoji ranges and CJK Extension B+
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/// beyond 0x2FA1F omitted for the backlog).
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pub(crate) fn is_wide(c: char) -> bool {
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let u = c as u32;
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matches!(
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u,
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0x1100..=0x115F // Hangul Jamo
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| 0x2E80..=0xA4CF // CJK Radicals, Kangxi, Hiragana, Katakana, Bopomofo, Hangul Compatibility, CJK Unified Ideographs, Yi
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| 0xAC00..=0xD7A3 // Hangul Syllables
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| 0xF900..=0xFAFF // CJK Compatibility Ideographs
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| 0xFE30..=0xFE4F // CJK Compatibility Forms
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| 0xFF01..=0xFF60 // Fullwidth ASCII variants
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| 0xFFE0..=0xFFE6 // Fullwidth symbol variants
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| 0x20000..=0x2FA1F // CJK Unified Ideographs Extension B-F, Compatibility Supplement
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)
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}
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/// Estimated popup width for a vertical list of labels. Wide (CJK) glyphs
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/// count double so localized labels via t!() don't truncate.
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pub fn dropdown_popup_width<'a>(
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labels: impl Iterator<Item = &'a str>,
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font_size: f32,
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chrome: f32,
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min: f32,
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) -> f32 {
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let max_units = labels
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.map(|l| l.chars().map(|c| if is_wide(c) { 2.0 } else { 1.0 }).sum::<f32>())
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.fold(0.0f32, f32::max);
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(max_units * font_size * 0.68 + chrome).max(min)
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}
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