1mod align;
2mod canvas;
3mod constrained_box;
4mod container;
5mod empty;
6mod expanded;
7mod flex;
8mod hook;
9mod image;
10mod keystroke_label;
11mod label;
12mod list;
13mod mouse_event_handler;
14mod overlay;
15mod resizable;
16mod stack;
17mod svg;
18mod text;
19mod tooltip;
20mod uniform_list;
21
22use self::expanded::Expanded;
23pub use self::{
24 align::*, canvas::*, constrained_box::*, container::*, empty::*, flex::*, hook::*, image::*,
25 keystroke_label::*, label::*, list::*, mouse_event_handler::*, overlay::*, resizable::*,
26 stack::*, svg::*, text::*, tooltip::*, uniform_list::*,
27};
28pub use crate::presenter::ChildView;
29use crate::{
30 geometry::{
31 rect::RectF,
32 vector::{vec2f, Vector2F},
33 },
34 json,
35 presenter::MeasurementContext,
36 Action, DebugContext, Event, EventContext, LayoutContext, PaintContext, RenderContext,
37 SizeConstraint, View,
38};
39use core::panic;
40use json::ToJson;
41use std::{
42 any::Any,
43 borrow::Cow,
44 cell::RefCell,
45 mem,
46 ops::{Deref, DerefMut, Range},
47 rc::Rc,
48};
49
50trait AnyElement {
51 fn layout(&mut self, constraint: SizeConstraint, cx: &mut LayoutContext) -> Vector2F;
52 fn paint(&mut self, origin: Vector2F, visible_bounds: RectF, cx: &mut PaintContext);
53 fn dispatch_event(&mut self, event: &Event, cx: &mut EventContext) -> bool;
54 fn rect_for_text_range(
55 &self,
56 range_utf16: Range<usize>,
57 cx: &MeasurementContext,
58 ) -> Option<RectF>;
59 fn debug(&self, cx: &DebugContext) -> serde_json::Value;
60
61 fn size(&self) -> Vector2F;
62 fn metadata(&self) -> Option<&dyn Any>;
63}
64
65pub trait Element {
66 type LayoutState;
67 type PaintState;
68
69 fn layout(
70 &mut self,
71 constraint: SizeConstraint,
72 cx: &mut LayoutContext,
73 ) -> (Vector2F, Self::LayoutState);
74
75 fn paint(
76 &mut self,
77 bounds: RectF,
78 visible_bounds: RectF,
79 layout: &mut Self::LayoutState,
80 cx: &mut PaintContext,
81 ) -> Self::PaintState;
82
83 fn dispatch_event(
84 &mut self,
85 event: &Event,
86 bounds: RectF,
87 visible_bounds: RectF,
88 layout: &mut Self::LayoutState,
89 paint: &mut Self::PaintState,
90 cx: &mut EventContext,
91 ) -> bool;
92
93 fn rect_for_text_range(
94 &self,
95 range_utf16: Range<usize>,
96 bounds: RectF,
97 visible_bounds: RectF,
98 layout: &Self::LayoutState,
99 paint: &Self::PaintState,
100 cx: &MeasurementContext,
101 ) -> Option<RectF>;
102
103 fn metadata(&self) -> Option<&dyn Any> {
104 None
105 }
106
107 fn debug(
108 &self,
109 bounds: RectF,
110 layout: &Self::LayoutState,
111 paint: &Self::PaintState,
112 cx: &DebugContext,
113 ) -> serde_json::Value;
114
115 fn boxed(self) -> ElementBox
116 where
117 Self: 'static + Sized,
118 {
119 ElementBox(ElementRc {
120 name: None,
121 element: Rc::new(RefCell::new(Lifecycle::Init { element: self })),
122 })
123 }
124
125 fn named(self, name: impl Into<Cow<'static, str>>) -> ElementBox
126 where
127 Self: 'static + Sized,
128 {
129 ElementBox(ElementRc {
130 name: Some(name.into()),
131 element: Rc::new(RefCell::new(Lifecycle::Init { element: self })),
132 })
133 }
134
135 fn constrained(self) -> ConstrainedBox
136 where
137 Self: 'static + Sized,
138 {
139 ConstrainedBox::new(self.boxed())
140 }
141
142 fn aligned(self) -> Align
143 where
144 Self: 'static + Sized,
145 {
146 Align::new(self.boxed())
147 }
148
149 fn contained(self) -> Container
150 where
151 Self: 'static + Sized,
152 {
153 Container::new(self.boxed())
154 }
155
156 fn expanded(self) -> Expanded
157 where
158 Self: 'static + Sized,
159 {
160 Expanded::new(self.boxed())
161 }
162
163 fn flex(self, flex: f32, expanded: bool) -> FlexItem
164 where
165 Self: 'static + Sized,
166 {
167 FlexItem::new(self.boxed()).flex(flex, expanded)
168 }
169
170 fn flex_float(self) -> FlexItem
171 where
172 Self: 'static + Sized,
173 {
174 FlexItem::new(self.boxed()).float()
175 }
176
177 fn with_tooltip<Tag: 'static, T: View>(
178 self,
179 id: usize,
180 text: String,
181 action: Option<Box<dyn Action>>,
182 style: TooltipStyle,
183 cx: &mut RenderContext<T>,
184 ) -> Tooltip
185 where
186 Self: 'static + Sized,
187 {
188 Tooltip::new::<Tag, T>(id, text, action, style, self.boxed(), cx)
189 }
190
191 fn with_resize_handle<Tag: 'static, T: View>(
192 self,
193 element_id: usize,
194 side: Side,
195 handle_size: f32,
196 initial_size: f32,
197 cx: &mut RenderContext<T>,
198 ) -> Resizable
199 where
200 Self: 'static + Sized,
201 {
202 Resizable::new::<Tag, T>(
203 self.boxed(),
204 element_id,
205 side,
206 handle_size,
207 initial_size,
208 cx,
209 )
210 }
211}
212
213pub enum Lifecycle<T: Element> {
214 Empty,
215 Init {
216 element: T,
217 },
218 PostLayout {
219 element: T,
220 constraint: SizeConstraint,
221 size: Vector2F,
222 layout: T::LayoutState,
223 },
224 PostPaint {
225 element: T,
226 constraint: SizeConstraint,
227 bounds: RectF,
228 visible_bounds: RectF,
229 layout: T::LayoutState,
230 paint: T::PaintState,
231 },
232}
233pub struct ElementBox(ElementRc);
234
235#[derive(Clone)]
236pub struct ElementRc {
237 name: Option<Cow<'static, str>>,
238 element: Rc<RefCell<dyn AnyElement>>,
239}
240
241impl<T: Element> AnyElement for Lifecycle<T> {
242 fn layout(&mut self, constraint: SizeConstraint, cx: &mut LayoutContext) -> Vector2F {
243 let result;
244 *self = match mem::take(self) {
245 Lifecycle::Empty => unreachable!(),
246 Lifecycle::Init { mut element }
247 | Lifecycle::PostLayout { mut element, .. }
248 | Lifecycle::PostPaint { mut element, .. } => {
249 let (size, layout) = element.layout(constraint, cx);
250 debug_assert!(size.x().is_finite());
251 debug_assert!(size.y().is_finite());
252
253 result = size;
254 Lifecycle::PostLayout {
255 element,
256 constraint,
257 size,
258 layout,
259 }
260 }
261 };
262 result
263 }
264
265 fn paint(&mut self, origin: Vector2F, visible_bounds: RectF, cx: &mut PaintContext) {
266 *self = match mem::take(self) {
267 Lifecycle::PostLayout {
268 mut element,
269 constraint,
270 size,
271 mut layout,
272 } => {
273 let bounds = RectF::new(origin, size);
274 let paint = element.paint(bounds, visible_bounds, &mut layout, cx);
275 Lifecycle::PostPaint {
276 element,
277 constraint,
278 bounds,
279 visible_bounds,
280 layout,
281 paint,
282 }
283 }
284 Lifecycle::PostPaint {
285 mut element,
286 constraint,
287 bounds,
288 mut layout,
289 ..
290 } => {
291 let bounds = RectF::new(origin, bounds.size());
292 let paint = element.paint(bounds, visible_bounds, &mut layout, cx);
293 Lifecycle::PostPaint {
294 element,
295 constraint,
296 bounds,
297 visible_bounds,
298 layout,
299 paint,
300 }
301 }
302 _ => panic!("invalid element lifecycle state"),
303 }
304 }
305
306 fn dispatch_event(&mut self, event: &Event, cx: &mut EventContext) -> bool {
307 if let Lifecycle::PostPaint {
308 element,
309 bounds,
310 visible_bounds,
311 layout,
312 paint,
313 ..
314 } = self
315 {
316 element.dispatch_event(event, *bounds, *visible_bounds, layout, paint, cx)
317 } else {
318 panic!("invalid element lifecycle state");
319 }
320 }
321
322 fn rect_for_text_range(
323 &self,
324 range_utf16: Range<usize>,
325 cx: &MeasurementContext,
326 ) -> Option<RectF> {
327 if let Lifecycle::PostPaint {
328 element,
329 bounds,
330 visible_bounds,
331 layout,
332 paint,
333 ..
334 } = self
335 {
336 element.rect_for_text_range(range_utf16, *bounds, *visible_bounds, layout, paint, cx)
337 } else {
338 None
339 }
340 }
341
342 fn size(&self) -> Vector2F {
343 match self {
344 Lifecycle::Empty | Lifecycle::Init { .. } => panic!("invalid element lifecycle state"),
345 Lifecycle::PostLayout { size, .. } => *size,
346 Lifecycle::PostPaint { bounds, .. } => bounds.size(),
347 }
348 }
349
350 fn metadata(&self) -> Option<&dyn Any> {
351 match self {
352 Lifecycle::Empty => unreachable!(),
353 Lifecycle::Init { element }
354 | Lifecycle::PostLayout { element, .. }
355 | Lifecycle::PostPaint { element, .. } => element.metadata(),
356 }
357 }
358
359 fn debug(&self, cx: &DebugContext) -> serde_json::Value {
360 match self {
361 Lifecycle::PostPaint {
362 element,
363 constraint,
364 bounds,
365 visible_bounds,
366 layout,
367 paint,
368 } => {
369 let mut value = element.debug(*bounds, layout, paint, cx);
370 if let json::Value::Object(map) = &mut value {
371 let mut new_map: crate::json::Map<String, serde_json::Value> =
372 Default::default();
373 if let Some(typ) = map.remove("type") {
374 new_map.insert("type".into(), typ);
375 }
376 new_map.insert("constraint".into(), constraint.to_json());
377 new_map.insert("bounds".into(), bounds.to_json());
378 new_map.insert("visible_bounds".into(), visible_bounds.to_json());
379 new_map.append(map);
380 json::Value::Object(new_map)
381 } else {
382 value
383 }
384 }
385 _ => panic!("invalid element lifecycle state"),
386 }
387 }
388}
389
390impl<T: Element> Default for Lifecycle<T> {
391 fn default() -> Self {
392 Self::Empty
393 }
394}
395
396impl ElementBox {
397 pub fn name(&self) -> Option<&str> {
398 self.0.name.as_deref()
399 }
400
401 pub fn metadata<T: 'static>(&self) -> Option<&T> {
402 let element = unsafe { &*self.0.element.as_ptr() };
403 element.metadata().and_then(|m| m.downcast_ref())
404 }
405}
406
407impl From<ElementBox> for ElementRc {
408 fn from(val: ElementBox) -> Self {
409 val.0
410 }
411}
412
413impl Deref for ElementBox {
414 type Target = ElementRc;
415
416 fn deref(&self) -> &Self::Target {
417 &self.0
418 }
419}
420
421impl DerefMut for ElementBox {
422 fn deref_mut(&mut self) -> &mut Self::Target {
423 &mut self.0
424 }
425}
426
427impl ElementRc {
428 pub fn layout(&mut self, constraint: SizeConstraint, cx: &mut LayoutContext) -> Vector2F {
429 self.element.borrow_mut().layout(constraint, cx)
430 }
431
432 pub fn paint(&mut self, origin: Vector2F, visible_bounds: RectF, cx: &mut PaintContext) {
433 self.element.borrow_mut().paint(origin, visible_bounds, cx);
434 }
435
436 pub fn dispatch_event(&mut self, event: &Event, cx: &mut EventContext) -> bool {
437 self.element.borrow_mut().dispatch_event(event, cx)
438 }
439
440 pub fn rect_for_text_range(
441 &self,
442 range_utf16: Range<usize>,
443 cx: &MeasurementContext,
444 ) -> Option<RectF> {
445 self.element.borrow().rect_for_text_range(range_utf16, cx)
446 }
447
448 pub fn size(&self) -> Vector2F {
449 self.element.borrow().size()
450 }
451
452 pub fn debug(&self, cx: &DebugContext) -> json::Value {
453 let mut value = self.element.borrow().debug(cx);
454
455 if let Some(name) = &self.name {
456 if let json::Value::Object(map) = &mut value {
457 let mut new_map: crate::json::Map<String, serde_json::Value> = Default::default();
458 new_map.insert("name".into(), json::Value::String(name.to_string()));
459 new_map.append(map);
460 return json::Value::Object(new_map);
461 }
462 }
463
464 value
465 }
466
467 pub fn with_metadata<T, F, R>(&self, f: F) -> R
468 where
469 T: 'static,
470 F: FnOnce(Option<&T>) -> R,
471 {
472 let element = self.element.borrow();
473 f(element.metadata().and_then(|m| m.downcast_ref()))
474 }
475}
476
477pub trait ParentElement<'a>: Extend<ElementBox> + Sized {
478 fn add_children(&mut self, children: impl IntoIterator<Item = ElementBox>) {
479 self.extend(children);
480 }
481
482 fn add_child(&mut self, child: ElementBox) {
483 self.add_children(Some(child));
484 }
485
486 fn with_children(mut self, children: impl IntoIterator<Item = ElementBox>) -> Self {
487 self.add_children(children);
488 self
489 }
490
491 fn with_child(self, child: ElementBox) -> Self {
492 self.with_children(Some(child))
493 }
494}
495
496impl<'a, T> ParentElement<'a> for T where T: Extend<ElementBox> {}
497
498fn constrain_size_preserving_aspect_ratio(max_size: Vector2F, size: Vector2F) -> Vector2F {
499 if max_size.x().is_infinite() && max_size.y().is_infinite() {
500 size
501 } else if max_size.x().is_infinite() || max_size.x() / max_size.y() > size.x() / size.y() {
502 vec2f(size.x() * max_size.y() / size.y(), max_size.y())
503 } else {
504 vec2f(max_size.x(), size.y() * max_size.x() / size.x())
505 }
506}