| 1 | //! UI surfaces: status bar, grid view, palette, which-key, help and info panel. |
| 2 | //! |
| 3 | //! Each frame the UI turns state into a [`Scene`]; the renderer only draws it. |
| 4 | |
| 5 | use std::path::Path; |
| 6 | use std::time::Instant; |
| 7 | |
| 8 | use crate::config::theme::{Rgba, Theme}; |
| 9 | use crate::render::image::AlphaStyle; |
| 10 | use crate::render::prims::Prim; |
| 11 | use crate::render::text::{Align, FontRole, TextItem}; |
| 12 | use crate::render::{ImageDraw, Scene}; |
| 13 | use crate::state::{AlphaBg, AppState, MsgKind}; |
| 14 | |
| 15 | /// Space Mono label tracking. |
| 16 | const LABEL_TRACKING: f32 = 0.08; |
| 17 | |
| 18 | pub fn file_name(path: &Path) -> String { |
| 19 | path.file_name().map_or_else( |
| 20 | || path.display().to_string(), |
| 21 | |n| n.to_string_lossy().into(), |
| 22 | ) |
| 23 | } |
| 24 | |
| 25 | fn label(text: &str, color: Rgba, sf: f32, x: f32, y: f32, align: Align) -> TextItem { |
| 26 | TextItem { |
| 27 | spans: vec![(text.to_uppercase(), color)], |
| 28 | role: FontRole::Mono, |
| 29 | size: (11.0 * sf).round(), |
| 30 | weight: 400, |
| 31 | tracking: LABEL_TRACKING, |
| 32 | x, |
| 33 | y, |
| 34 | align, |
| 35 | max_width: None, |
| 36 | } |
| 37 | } |
| 38 | |
| 39 | /// Longest message shown before truncation, in characters. |
| 40 | const MAX_MESSAGE: usize = 72; |
| 41 | |
| 42 | /// `measure` returns the laid-out width of a text item, for layouts that depend on it. |
| 43 | pub fn scene<'a>( |
| 44 | state: &'a AppState, |
| 45 | theme: &Theme, |
| 46 | now: Instant, |
| 47 | measure: &mut dyn FnMut(&TextItem) -> f32, |
| 48 | ) -> Scene<'a> { |
| 49 | let sf = state.scale_factor(); |
| 50 | let [w, h] = state.window(); |
| 51 | let bar_h = state.bar_height(); |
| 52 | let mut scene = Scene { |
| 53 | clear: theme.background, |
| 54 | image_clip: [0.0, 0.0, w, h - bar_h], |
| 55 | alpha: alpha_style(state.alpha_bg, theme, sf), |
| 56 | images: Vec::new(), |
| 57 | prims: Vec::new(), |
| 58 | texts: Vec::new(), |
| 59 | }; |
| 60 | |
| 61 | let nearest = state.effective_nearest(now); |
| 62 | if let Some(fade) = &state.fade { |
| 63 | scene.images.push(ImageDraw { |
| 64 | path: &fade.path, |
| 65 | affine: fade.affine, |
| 66 | alpha: 1.0, |
| 67 | nearest, |
| 68 | }); |
| 69 | } |
| 70 | if let Some(shown) = &state.shown { |
| 71 | let alpha = state.fade.as_ref().map_or(1.0, |f| f.alpha.value(now)); |
| 72 | let affine = state.view.transform(now); |
| 73 | scene.images.push(ImageDraw { |
| 74 | path: &shown.path, |
| 75 | affine, |
| 76 | alpha, |
| 77 | nearest, |
| 78 | }); |
| 79 | } |
| 80 | |
| 81 | if state.queue.is_empty() { |
| 82 | empty_state(&mut scene, theme, sf, [w, h - bar_h]); |
| 83 | } |
| 84 | if bar_h > 0.0 { |
| 85 | status_bar(&mut scene, state, theme, now, [w, h], bar_h, measure); |
| 86 | } |
| 87 | scene |
| 88 | } |
| 89 | |
| 90 | fn alpha_style(bg: AlphaBg, theme: &Theme, sf: f32) -> AlphaStyle { |
| 91 | let (mode, dot) = match bg { |
| 92 | AlphaBg::Solid => (0, theme.image_background), |
| 93 | AlphaBg::Dots => (1, theme.border_visible), |
| 94 | AlphaBg::Checker => (2, theme.surface_raised), |
| 95 | }; |
| 96 | let cell = if mode == 2 { 8.0 } else { 16.0 }; |
| 97 | AlphaStyle { |
| 98 | mode, |
| 99 | bg: theme.image_background.linear(), |
| 100 | dot: dot.linear(), |
| 101 | cell: (cell * sf).round(), |
| 102 | radius: sf.max(1.0), |
| 103 | } |
| 104 | } |
| 105 | |
| 106 | /// Doto `NO IMAGES` and one hint line. |
| 107 | fn empty_state(scene: &mut Scene, theme: &Theme, sf: f32, area: [f32; 2]) { |
| 108 | let cx = area[0] * 0.5; |
| 109 | let cy = area[1] * 0.5; |
| 110 | scene.texts.push(TextItem { |
| 111 | spans: vec![("NO IMAGES".into(), theme.text_secondary)], |
| 112 | role: FontRole::Display, |
| 113 | size: (48.0 * sf).round(), |
| 114 | weight: 700, |
| 115 | tracking: -0.02, |
| 116 | x: cx, |
| 117 | y: cy - 12.0 * sf, |
| 118 | align: Align::Center, |
| 119 | max_width: None, |
| 120 | }); |
| 121 | let hint = "remage <file|dir>…"; |
| 122 | scene.texts.push(label( |
| 123 | hint, |
| 124 | theme.text_disabled, |
| 125 | sf, |
| 126 | cx, |
| 127 | cy + 32.0 * sf, |
| 128 | Align::Center, |
| 129 | )); |
| 130 | } |
| 131 | |
| 132 | fn status_bar( |
| 133 | scene: &mut Scene, |
| 134 | state: &AppState, |
| 135 | theme: &Theme, |
| 136 | now: Instant, |
| 137 | [w, h]: [f32; 2], |
| 138 | bar_h: f32, |
| 139 | measure: &mut dyn FnMut(&TextItem) -> f32, |
| 140 | ) { |
| 141 | let sf = state.scale_factor(); |
| 142 | let pad = 16.0 * sf; |
| 143 | let y = h - bar_h * 0.5; |
| 144 | scene.prims.push(Prim::rect( |
| 145 | [0.0, h - bar_h, w, bar_h], |
| 146 | theme.background.linear(), |
| 147 | )); |
| 148 | |
| 149 | let mut spans: Vec<(String, Rgba)> = Vec::new(); |
| 150 | if !state.pending.is_empty() { |
| 151 | spans.push((state.pending.clone(), theme.text_disabled)); |
| 152 | } |
| 153 | if let Some(m) = &state.message { |
| 154 | let color = if m.kind == MsgKind::Error { |
| 155 | theme.accent |
| 156 | } else { |
| 157 | theme.text_primary |
| 158 | }; |
| 159 | let mut text = m.text.to_uppercase(); |
| 160 | if let Some((cut, _)) = text.char_indices().nth(MAX_MESSAGE) { |
| 161 | text.truncate(cut); |
| 162 | text.push('…'); |
| 163 | } |
| 164 | spans.push((format!("[{text}]"), color)); |
| 165 | } |
| 166 | if state.loading_visible(now) { |
| 167 | spans.push(("[LOADING]".into(), theme.text_secondary)); |
| 168 | } |
| 169 | if state.skipped > 0 { |
| 170 | spans.push((format!("[SKIPPED {}]", state.skipped), theme.text_secondary)); |
| 171 | } |
| 172 | let mut info = Vec::new(); |
| 173 | if let Some(s) = state |
| 174 | .shown |
| 175 | .as_ref() |
| 176 | .filter(|s| Some(s.path.as_path()) == state.queue.current()) |
| 177 | { |
| 178 | info.push(s.format.to_string()); |
| 179 | info.push(format!("{}×{}", s.size[0], s.size[1])); |
| 180 | info.push(format!("{}%", (state.view.scale() * 100.0).round())); |
| 181 | } |
| 182 | if !state.queue.is_empty() { |
| 183 | let count = state.queue.len(); |
| 184 | let digits = count.to_string().len().max(3); |
| 185 | info.push(format!("{:0digits$}/{count}", state.queue.index() + 1)); |
| 186 | } |
| 187 | if !info.is_empty() { |
| 188 | spans.push((info.join(" "), theme.text_secondary)); |
| 189 | } |
| 190 | // Two spaces between segments, attached to the preceding span so colours stay put. |
| 191 | let n = spans.len(); |
| 192 | for (s, _) in spans.iter_mut().take(n.saturating_sub(1)) { |
| 193 | s.push_str(" "); |
| 194 | } |
| 195 | let mut right_w = 0.0; |
| 196 | if !spans.is_empty() { |
| 197 | let mut item = label("", theme.text_secondary, sf, w - pad, y, Align::Right); |
| 198 | item.spans = spans |
| 199 | .into_iter() |
| 200 | .map(|(s, c)| (s.to_uppercase(), c)) |
| 201 | .collect(); |
| 202 | right_w = measure(&item); |
| 203 | scene.texts.push(item); |
| 204 | } |
| 205 | |
| 206 | // The filename takes whatever the right side leaves, ellipsised in the middle. |
| 207 | if let Some(cur) = state.queue.current() { |
| 208 | let room = (w - 2.0 * pad - right_w - 32.0 * sf).max(0.0); |
| 209 | scene.texts.push(TextItem { |
| 210 | spans: vec![(file_name(cur), theme.text_primary)], |
| 211 | role: FontRole::Ui, |
| 212 | size: (14.0 * sf).round(), |
| 213 | weight: 400, |
| 214 | tracking: 0.0, |
| 215 | x: pad, |
| 216 | y, |
| 217 | align: Align::Left, |
| 218 | max_width: Some(room), |
| 219 | }); |
| 220 | } |
| 221 | } |