1use crate::{
2 black, phi, point, rems, AbsoluteLength, BorrowAppContext, BorrowWindow, Bounds, ContentMask,
3 Corners, CornersRefinement, DefiniteLength, Edges, EdgesRefinement, Font, FontFeatures,
4 FontStyle, FontWeight, Hsla, Length, Pixels, Point, PointRefinement, Rems, Result,
5 SharedString, Size, SizeRefinement, TextRun, ViewContext, WindowContext,
6};
7use refineable::{Cascade, Refineable};
8use smallvec::SmallVec;
9pub use taffy::style::{
10 AlignContent, AlignItems, AlignSelf, Display, FlexDirection, FlexWrap, JustifyContent,
11 Overflow, Position,
12};
13
14pub type StyleCascade = Cascade<Style>;
15
16#[derive(Clone, Refineable, Debug)]
17#[refineable(debug)]
18pub struct Style {
19 /// What layout strategy should be used?
20 pub display: Display,
21
22 // Overflow properties
23 /// How children overflowing their container should affect layout
24 #[refineable]
25 pub overflow: Point<Overflow>,
26 /// How much space (in points) should be reserved for the scrollbars of `Overflow::Scroll` and `Overflow::Auto` nodes.
27 pub scrollbar_width: f32,
28
29 // Position properties
30 /// What should the `position` value of this struct use as a base offset?
31 pub position: Position,
32 /// How should the position of this element be tweaked relative to the layout defined?
33 #[refineable]
34 pub inset: Edges<Length>,
35
36 // Size properies
37 /// Sets the initial size of the item
38 #[refineable]
39 pub size: Size<Length>,
40 /// Controls the minimum size of the item
41 #[refineable]
42 pub min_size: Size<Length>,
43 /// Controls the maximum size of the item
44 #[refineable]
45 pub max_size: Size<Length>,
46 /// Sets the preferred aspect ratio for the item. The ratio is calculated as width divided by height.
47 pub aspect_ratio: Option<f32>,
48
49 // Spacing Properties
50 /// How large should the margin be on each side?
51 #[refineable]
52 pub margin: Edges<Length>,
53 /// How large should the padding be on each side?
54 #[refineable]
55 pub padding: Edges<DefiniteLength>,
56 /// How large should the border be on each side?
57 #[refineable]
58 pub border_widths: Edges<AbsoluteLength>,
59
60 // Alignment properties
61 /// How this node's children aligned in the cross/block axis?
62 pub align_items: Option<AlignItems>,
63 /// How this node should be aligned in the cross/block axis. Falls back to the parents [`AlignItems`] if not set
64 pub align_self: Option<AlignSelf>,
65 /// How should content contained within this item be aligned in the cross/block axis
66 pub align_content: Option<AlignContent>,
67 /// How should contained within this item be aligned in the main/inline axis
68 pub justify_content: Option<JustifyContent>,
69 /// How large should the gaps between items in a flex container be?
70 #[refineable]
71 pub gap: Size<DefiniteLength>,
72
73 // Flexbox properies
74 /// Which direction does the main axis flow in?
75 pub flex_direction: FlexDirection,
76 /// Should elements wrap, or stay in a single line?
77 pub flex_wrap: FlexWrap,
78 /// Sets the initial main axis size of the item
79 pub flex_basis: Length,
80 /// The relative rate at which this item grows when it is expanding to fill space, 0.0 is the default value, and this value must be positive.
81 pub flex_grow: f32,
82 /// The relative rate at which this item shrinks when it is contracting to fit into space, 1.0 is the default value, and this value must be positive.
83 pub flex_shrink: f32,
84
85 /// The fill color of this element
86 pub fill: Option<Fill>,
87
88 /// The border color of this element
89 pub border_color: Option<Hsla>,
90
91 /// The radius of the corners of this element
92 #[refineable]
93 pub corner_radii: Corners<AbsoluteLength>,
94
95 /// Box Shadow of the element
96 pub box_shadow: SmallVec<[BoxShadow; 2]>,
97
98 /// TEXT
99 pub text: TextStyleRefinement,
100
101 pub z_index: Option<u32>,
102}
103
104#[derive(Clone, Debug)]
105pub struct BoxShadow {
106 pub color: Hsla,
107 pub offset: Point<Pixels>,
108 pub blur_radius: Pixels,
109 pub spread_radius: Pixels,
110}
111
112#[derive(Refineable, Clone, Debug)]
113#[refineable(debug)]
114pub struct TextStyle {
115 pub color: Hsla,
116 pub font_family: SharedString,
117 pub font_features: FontFeatures,
118 pub font_size: Rems,
119 pub line_height: DefiniteLength,
120 pub font_weight: FontWeight,
121 pub font_style: FontStyle,
122 pub underline: Option<UnderlineStyle>,
123}
124
125impl Default for TextStyle {
126 fn default() -> Self {
127 TextStyle {
128 color: black(),
129 font_family: "Helvetica".into(), // todo!("Get a font we know exists on the system")
130 font_features: FontFeatures::default(),
131 font_size: rems(1.),
132 line_height: phi(),
133 font_weight: FontWeight::default(),
134 font_style: FontStyle::default(),
135 underline: None,
136 }
137 }
138}
139
140impl TextStyle {
141 pub fn highlight(mut self, style: HighlightStyle) -> Result<Self> {
142 if let Some(weight) = style.font_weight {
143 self.font_weight = weight;
144 }
145 if let Some(style) = style.font_style {
146 self.font_style = style;
147 }
148
149 if let Some(color) = style.color {
150 self.color = self.color.blend(color);
151 }
152
153 if let Some(factor) = style.fade_out {
154 self.color.fade_out(factor);
155 }
156
157 if let Some(underline) = style.underline {
158 self.underline = Some(underline);
159 }
160
161 Ok(self)
162 }
163
164 pub fn to_run(&self, len: usize) -> TextRun {
165 TextRun {
166 len,
167 font: Font {
168 family: self.font_family.clone(),
169 features: Default::default(),
170 weight: self.font_weight,
171 style: self.font_style,
172 },
173 color: self.color,
174 underline: self.underline.clone(),
175 }
176 }
177}
178
179#[derive(Clone, Debug, Default, PartialEq)]
180pub struct HighlightStyle {
181 pub color: Option<Hsla>,
182 pub font_weight: Option<FontWeight>,
183 pub font_style: Option<FontStyle>,
184 pub underline: Option<UnderlineStyle>,
185 pub fade_out: Option<f32>,
186}
187
188impl Eq for HighlightStyle {}
189
190impl Style {
191 pub fn text_style(&self, _cx: &WindowContext) -> Option<&TextStyleRefinement> {
192 if self.text.is_some() {
193 Some(&self.text)
194 } else {
195 None
196 }
197 }
198
199 pub fn apply_text_style<C, F, R>(&self, cx: &mut C, f: F) -> R
200 where
201 C: BorrowAppContext,
202 F: FnOnce(&mut C) -> R,
203 {
204 if self.text.is_some() {
205 cx.with_text_style(self.text.clone(), f)
206 } else {
207 f(cx)
208 }
209 }
210
211 /// Apply overflow to content mask
212 pub fn apply_overflow<C, F, R>(&self, bounds: Bounds<Pixels>, cx: &mut C, f: F) -> R
213 where
214 C: BorrowWindow,
215 F: FnOnce(&mut C) -> R,
216 {
217 let current_mask = cx.content_mask();
218
219 let min = current_mask.bounds.origin;
220 let max = current_mask.bounds.lower_right();
221
222 let mask_bounds = match (
223 self.overflow.x == Overflow::Visible,
224 self.overflow.y == Overflow::Visible,
225 ) {
226 // x and y both visible
227 (true, true) => return f(cx),
228 // x visible, y hidden
229 (true, false) => Bounds::from_corners(
230 point(min.x, bounds.origin.y),
231 point(max.x, bounds.lower_right().y),
232 ),
233 // x hidden, y visible
234 (false, true) => Bounds::from_corners(
235 point(bounds.origin.x, min.y),
236 point(bounds.lower_right().x, max.y),
237 ),
238 // both hidden
239 (false, false) => bounds,
240 };
241 let mask = ContentMask {
242 bounds: mask_bounds,
243 };
244
245 cx.with_content_mask(mask, f)
246 }
247
248 /// Paints the background of an element styled with this style.
249 pub fn paint<V: 'static>(&self, bounds: Bounds<Pixels>, cx: &mut ViewContext<V>) {
250 let rem_size = cx.rem_size();
251
252 cx.stack(0, |cx| {
253 cx.paint_shadows(
254 bounds,
255 self.corner_radii.to_pixels(bounds.size, rem_size),
256 &self.box_shadow,
257 );
258 });
259
260 let background_color = self.fill.as_ref().and_then(Fill::color);
261 if background_color.is_some() || self.is_border_visible() {
262 cx.stack(1, |cx| {
263 cx.paint_quad(
264 bounds,
265 self.corner_radii.to_pixels(bounds.size, rem_size),
266 background_color.unwrap_or_default(),
267 self.border_widths.to_pixels(rem_size),
268 self.border_color.unwrap_or_default(),
269 );
270 });
271 }
272 }
273
274 fn is_border_visible(&self) -> bool {
275 self.border_color
276 .map_or(false, |color| !color.is_transparent())
277 && self.border_widths.any(|length| !length.is_zero())
278 }
279}
280
281impl Default for Style {
282 fn default() -> Self {
283 Style {
284 display: Display::Block,
285 overflow: Point {
286 x: Overflow::Visible,
287 y: Overflow::Visible,
288 },
289 scrollbar_width: 0.0,
290 position: Position::Relative,
291 inset: Edges::auto(),
292 margin: Edges::<Length>::zero(),
293 padding: Edges::<DefiniteLength>::zero(),
294 border_widths: Edges::<AbsoluteLength>::zero(),
295 size: Size::auto(),
296 min_size: Size::auto(),
297 max_size: Size::auto(),
298 aspect_ratio: None,
299 gap: Size::zero(),
300 // Aligment
301 align_items: None,
302 align_self: None,
303 align_content: None,
304 justify_content: None,
305 // Flexbox
306 flex_direction: FlexDirection::Row,
307 flex_wrap: FlexWrap::NoWrap,
308 flex_grow: 0.0,
309 flex_shrink: 1.0,
310 flex_basis: Length::Auto,
311 fill: None,
312 border_color: None,
313 corner_radii: Corners::default(),
314 box_shadow: Default::default(),
315 text: TextStyleRefinement::default(),
316 z_index: None,
317 }
318 }
319}
320
321#[derive(Refineable, Clone, Default, Debug, PartialEq, Eq)]
322#[refineable(debug)]
323pub struct UnderlineStyle {
324 pub thickness: Pixels,
325 pub color: Option<Hsla>,
326 pub wavy: bool,
327}
328
329#[derive(Clone, Debug)]
330pub enum Fill {
331 Color(Hsla),
332}
333
334impl Fill {
335 pub fn color(&self) -> Option<Hsla> {
336 match self {
337 Fill::Color(color) => Some(*color),
338 }
339 }
340}
341
342impl Default for Fill {
343 fn default() -> Self {
344 Self::Color(Hsla::default())
345 }
346}
347
348impl From<Hsla> for Fill {
349 fn from(color: Hsla) -> Self {
350 Self::Color(color)
351 }
352}
353
354impl From<TextStyle> for HighlightStyle {
355 fn from(other: TextStyle) -> Self {
356 Self::from(&other)
357 }
358}
359
360impl From<&TextStyle> for HighlightStyle {
361 fn from(other: &TextStyle) -> Self {
362 Self {
363 color: Some(other.color),
364 font_weight: Some(other.font_weight),
365 font_style: Some(other.font_style),
366 underline: other.underline.clone(),
367 fade_out: None,
368 }
369 }
370}
371
372impl HighlightStyle {
373 pub fn highlight(&mut self, other: HighlightStyle) {
374 match (self.color, other.color) {
375 (Some(self_color), Some(other_color)) => {
376 self.color = Some(Hsla::blend(other_color, self_color));
377 }
378 (None, Some(other_color)) => {
379 self.color = Some(other_color);
380 }
381 _ => {}
382 }
383
384 if other.font_weight.is_some() {
385 self.font_weight = other.font_weight;
386 }
387
388 if other.font_style.is_some() {
389 self.font_style = other.font_style;
390 }
391
392 if other.underline.is_some() {
393 self.underline = other.underline;
394 }
395
396 match (other.fade_out, self.fade_out) {
397 (Some(source_fade), None) => self.fade_out = Some(source_fade),
398 (Some(source_fade), Some(dest_fade)) => {
399 self.fade_out = Some((dest_fade * (1. + source_fade)).clamp(0., 1.));
400 }
401 _ => {}
402 }
403 }
404}
405
406impl From<Hsla> for HighlightStyle {
407 fn from(color: Hsla) -> Self {
408 Self {
409 color: Some(color),
410 ..Default::default()
411 }
412 }
413}