1use crate::{
2 phi, point, rems, AbsoluteLength, BorrowAppContext, BorrowWindow, Bounds, ContentMask, Corners,
3 CornersRefinement, DefiniteLength, Edges, EdgesRefinement, Font, FontFeatures, FontStyle,
4 FontWeight, Hsla, Length, Pixels, Point, PointRefinement, Rems, Result, RunStyle, SharedString,
5 Size, SizeRefinement, 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: Hsla::default(),
129 font_family: SharedString::default(),
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) -> RunStyle {
165 RunStyle {
166 font: Font {
167 family: self.font_family.clone(),
168 features: Default::default(),
169 weight: self.font_weight,
170 style: self.font_style,
171 },
172 color: self.color,
173 underline: self.underline.clone(),
174 }
175 }
176}
177
178#[derive(Clone, Debug, Default, PartialEq)]
179pub struct HighlightStyle {
180 pub color: Option<Hsla>,
181 pub font_weight: Option<FontWeight>,
182 pub font_style: Option<FontStyle>,
183 pub underline: Option<UnderlineStyle>,
184 pub fade_out: Option<f32>,
185}
186
187impl Eq for HighlightStyle {}
188
189impl Style {
190 pub fn text_style(&self, _cx: &WindowContext) -> Option<&TextStyleRefinement> {
191 if self.text.is_some() {
192 Some(&self.text)
193 } else {
194 None
195 }
196 }
197
198 pub fn apply_text_style<C, F, R>(&self, cx: &mut C, f: F) -> R
199 where
200 C: BorrowAppContext,
201 F: FnOnce(&mut C) -> R,
202 {
203 if self.text.is_some() {
204 cx.with_text_style(self.text.clone(), f)
205 } else {
206 f(cx)
207 }
208 }
209
210 /// Apply overflow to content mask
211 pub fn apply_overflow<C, F, R>(&self, bounds: Bounds<Pixels>, cx: &mut C, f: F) -> R
212 where
213 C: BorrowWindow,
214 F: FnOnce(&mut C) -> R,
215 {
216 let current_mask = cx.content_mask();
217
218 let min = current_mask.bounds.origin;
219 let max = current_mask.bounds.lower_right();
220
221 let mask_bounds = match (
222 self.overflow.x == Overflow::Visible,
223 self.overflow.y == Overflow::Visible,
224 ) {
225 // x and y both visible
226 (true, true) => return f(cx),
227 // x visible, y hidden
228 (true, false) => Bounds::from_corners(
229 point(min.x, bounds.origin.y),
230 point(max.x, bounds.lower_right().y),
231 ),
232 // x hidden, y visible
233 (false, true) => Bounds::from_corners(
234 point(bounds.origin.x, min.y),
235 point(bounds.lower_right().x, max.y),
236 ),
237 // both hidden
238 (false, false) => bounds,
239 };
240 let mask = ContentMask {
241 bounds: mask_bounds,
242 };
243
244 cx.with_content_mask(mask, f)
245 }
246
247 /// Paints the background of an element styled with this style.
248 pub fn paint<V: 'static>(&self, bounds: Bounds<Pixels>, cx: &mut ViewContext<V>) {
249 let rem_size = cx.rem_size();
250
251 cx.stack(0, |cx| {
252 cx.paint_shadows(
253 bounds,
254 self.corner_radii.to_pixels(bounds.size, rem_size),
255 &self.box_shadow,
256 );
257 });
258
259 let background_color = self.fill.as_ref().and_then(Fill::color);
260 if background_color.is_some() || self.is_border_visible() {
261 cx.stack(1, |cx| {
262 cx.paint_quad(
263 bounds,
264 self.corner_radii.to_pixels(bounds.size, rem_size),
265 background_color.unwrap_or_default(),
266 self.border_widths.to_pixels(rem_size),
267 self.border_color.unwrap_or_default(),
268 );
269 });
270 }
271 }
272
273 fn is_border_visible(&self) -> bool {
274 self.border_color
275 .map_or(false, |color| !color.is_transparent())
276 && self.border_widths.any(|length| !length.is_zero())
277 }
278}
279
280impl Default for Style {
281 fn default() -> Self {
282 Style {
283 display: Display::Block,
284 overflow: Point {
285 x: Overflow::Visible,
286 y: Overflow::Visible,
287 },
288 scrollbar_width: 0.0,
289 position: Position::Relative,
290 inset: Edges::auto(),
291 margin: Edges::<Length>::zero(),
292 padding: Edges::<DefiniteLength>::zero(),
293 border_widths: Edges::<AbsoluteLength>::zero(),
294 size: Size::auto(),
295 min_size: Size::auto(),
296 max_size: Size::auto(),
297 aspect_ratio: None,
298 gap: Size::zero(),
299 // Aligment
300 align_items: None,
301 align_self: None,
302 align_content: None,
303 justify_content: None,
304 // Flexbox
305 flex_direction: FlexDirection::Row,
306 flex_wrap: FlexWrap::NoWrap,
307 flex_grow: 0.0,
308 flex_shrink: 1.0,
309 flex_basis: Length::Auto,
310 fill: None,
311 border_color: None,
312 corner_radii: Corners::default(),
313 box_shadow: Default::default(),
314 text: TextStyleRefinement::default(),
315 z_index: None,
316 }
317 }
318}
319
320#[derive(Refineable, Clone, Default, Debug, PartialEq, Eq)]
321#[refineable(debug)]
322pub struct UnderlineStyle {
323 pub thickness: Pixels,
324 pub color: Option<Hsla>,
325 pub wavy: bool,
326}
327
328#[derive(Clone, Debug)]
329pub enum Fill {
330 Color(Hsla),
331}
332
333impl Fill {
334 pub fn color(&self) -> Option<Hsla> {
335 match self {
336 Fill::Color(color) => Some(*color),
337 }
338 }
339}
340
341impl Default for Fill {
342 fn default() -> Self {
343 Self::Color(Hsla::default())
344 }
345}
346
347impl From<Hsla> for Fill {
348 fn from(color: Hsla) -> Self {
349 Self::Color(color)
350 }
351}
352
353impl From<TextStyle> for HighlightStyle {
354 fn from(other: TextStyle) -> Self {
355 Self::from(&other)
356 }
357}
358
359impl From<&TextStyle> for HighlightStyle {
360 fn from(other: &TextStyle) -> Self {
361 Self {
362 color: Some(other.color),
363 font_weight: Some(other.font_weight),
364 font_style: Some(other.font_style),
365 underline: other.underline.clone(),
366 fade_out: None,
367 }
368 }
369}
370
371impl HighlightStyle {
372 pub fn highlight(&mut self, other: HighlightStyle) {
373 match (self.color, other.color) {
374 (Some(self_color), Some(other_color)) => {
375 self.color = Some(Hsla::blend(other_color, self_color));
376 }
377 (None, Some(other_color)) => {
378 self.color = Some(other_color);
379 }
380 _ => {}
381 }
382
383 if other.font_weight.is_some() {
384 self.font_weight = other.font_weight;
385 }
386
387 if other.font_style.is_some() {
388 self.font_style = other.font_style;
389 }
390
391 if other.underline.is_some() {
392 self.underline = other.underline;
393 }
394
395 match (other.fade_out, self.fade_out) {
396 (Some(source_fade), None) => self.fade_out = Some(source_fade),
397 (Some(source_fade), Some(dest_fade)) => {
398 self.fade_out = Some((dest_fade * (1. + source_fade)).clamp(0., 1.));
399 }
400 _ => {}
401 }
402 }
403}
404
405impl From<Hsla> for HighlightStyle {
406 fn from(color: Hsla) -> Self {
407 Self {
408 color: Some(color),
409 ..Default::default()
410 }
411 }
412}