1use crate::{
2 div, point, Div, Element, FocusHandle, IntoElement, Keystroke, Modifiers, Pixels, Point,
3 Render, ViewContext,
4};
5use smallvec::SmallVec;
6use std::{any::Any, fmt::Debug, marker::PhantomData, ops::Deref, path::PathBuf};
7
8#[derive(Clone, Debug, Eq, PartialEq)]
9pub struct KeyDownEvent {
10 pub keystroke: Keystroke,
11 pub is_held: bool,
12}
13
14#[derive(Clone, Debug)]
15pub struct KeyUpEvent {
16 pub keystroke: Keystroke,
17}
18
19#[derive(Clone, Debug, Default)]
20pub struct ModifiersChangedEvent {
21 pub modifiers: Modifiers,
22}
23
24impl Deref for ModifiersChangedEvent {
25 type Target = Modifiers;
26
27 fn deref(&self) -> &Self::Target {
28 &self.modifiers
29 }
30}
31
32/// The phase of a touch motion event.
33/// Based on the winit enum of the same name.
34#[derive(Clone, Copy, Debug)]
35pub enum TouchPhase {
36 Started,
37 Moved,
38 Ended,
39}
40
41#[derive(Clone, Debug, Default)]
42pub struct MouseDownEvent {
43 pub button: MouseButton,
44 pub position: Point<Pixels>,
45 pub modifiers: Modifiers,
46 pub click_count: usize,
47}
48
49#[derive(Clone, Debug, Default)]
50pub struct MouseUpEvent {
51 pub button: MouseButton,
52 pub position: Point<Pixels>,
53 pub modifiers: Modifiers,
54 pub click_count: usize,
55}
56
57#[derive(Clone, Debug, Default)]
58pub struct ClickEvent {
59 pub down: MouseDownEvent,
60 pub up: MouseUpEvent,
61}
62
63pub struct Drag<S, R, V, E>
64where
65 R: Fn(&mut V, &mut ViewContext<V>) -> E,
66 V: 'static,
67 E: IntoElement,
68{
69 pub state: S,
70 pub render_drag_handle: R,
71 view_element_types: PhantomData<(V, E)>,
72}
73
74impl<S, R, V, E> Drag<S, R, V, E>
75where
76 R: Fn(&mut V, &mut ViewContext<V>) -> E,
77 V: 'static,
78 E: Element,
79{
80 pub fn new(state: S, render_drag_handle: R) -> Self {
81 Drag {
82 state,
83 render_drag_handle,
84 view_element_types: Default::default(),
85 }
86 }
87}
88
89#[derive(Hash, PartialEq, Eq, Copy, Clone, Debug)]
90pub enum MouseButton {
91 Left,
92 Right,
93 Middle,
94 Navigate(NavigationDirection),
95}
96
97impl MouseButton {
98 pub fn all() -> Vec<Self> {
99 vec![
100 MouseButton::Left,
101 MouseButton::Right,
102 MouseButton::Middle,
103 MouseButton::Navigate(NavigationDirection::Back),
104 MouseButton::Navigate(NavigationDirection::Forward),
105 ]
106 }
107}
108
109impl Default for MouseButton {
110 fn default() -> Self {
111 Self::Left
112 }
113}
114
115#[derive(Hash, PartialEq, Eq, Copy, Clone, Debug)]
116pub enum NavigationDirection {
117 Back,
118 Forward,
119}
120
121impl Default for NavigationDirection {
122 fn default() -> Self {
123 Self::Back
124 }
125}
126
127#[derive(Clone, Debug, Default)]
128pub struct MouseMoveEvent {
129 pub position: Point<Pixels>,
130 pub pressed_button: Option<MouseButton>,
131 pub modifiers: Modifiers,
132}
133
134#[derive(Clone, Debug)]
135pub struct ScrollWheelEvent {
136 pub position: Point<Pixels>,
137 pub delta: ScrollDelta,
138 pub modifiers: Modifiers,
139 pub touch_phase: TouchPhase,
140}
141
142impl Deref for ScrollWheelEvent {
143 type Target = Modifiers;
144
145 fn deref(&self) -> &Self::Target {
146 &self.modifiers
147 }
148}
149
150#[derive(Clone, Copy, Debug)]
151pub enum ScrollDelta {
152 Pixels(Point<Pixels>),
153 Lines(Point<f32>),
154}
155
156impl Default for ScrollDelta {
157 fn default() -> Self {
158 Self::Lines(Default::default())
159 }
160}
161
162impl ScrollDelta {
163 pub fn precise(&self) -> bool {
164 match self {
165 ScrollDelta::Pixels(_) => true,
166 ScrollDelta::Lines(_) => false,
167 }
168 }
169
170 pub fn pixel_delta(&self, line_height: Pixels) -> Point<Pixels> {
171 match self {
172 ScrollDelta::Pixels(delta) => *delta,
173 ScrollDelta::Lines(delta) => point(line_height * delta.x, line_height * delta.y),
174 }
175 }
176}
177
178#[derive(Clone, Debug, Default)]
179pub struct MouseExitEvent {
180 pub position: Point<Pixels>,
181 pub pressed_button: Option<MouseButton>,
182 pub modifiers: Modifiers,
183}
184
185impl Deref for MouseExitEvent {
186 type Target = Modifiers;
187
188 fn deref(&self) -> &Self::Target {
189 &self.modifiers
190 }
191}
192
193#[derive(Debug, Clone, Default)]
194pub struct ExternalPaths(pub(crate) SmallVec<[PathBuf; 2]>);
195
196impl ExternalPaths {
197 pub fn paths(&self) -> &[PathBuf] {
198 &self.0
199 }
200}
201
202impl Render for ExternalPaths {
203 type Element = Div;
204
205 fn render(&mut self, _: &mut ViewContext<Self>) -> Self::Element {
206 div() // Intentionally left empty because the platform will render icons for the dragged files
207 }
208}
209
210#[derive(Debug, Clone)]
211pub enum FileDropEvent {
212 Entered {
213 position: Point<Pixels>,
214 files: ExternalPaths,
215 },
216 Pending {
217 position: Point<Pixels>,
218 },
219 Submit {
220 position: Point<Pixels>,
221 },
222 Exited,
223}
224
225#[derive(Clone, Debug)]
226pub enum InputEvent {
227 KeyDown(KeyDownEvent),
228 KeyUp(KeyUpEvent),
229 ModifiersChanged(ModifiersChangedEvent),
230 MouseDown(MouseDownEvent),
231 MouseUp(MouseUpEvent),
232 MouseMove(MouseMoveEvent),
233 MouseExited(MouseExitEvent),
234 ScrollWheel(ScrollWheelEvent),
235 FileDrop(FileDropEvent),
236}
237
238impl InputEvent {
239 pub fn position(&self) -> Option<Point<Pixels>> {
240 match self {
241 InputEvent::KeyDown { .. } => None,
242 InputEvent::KeyUp { .. } => None,
243 InputEvent::ModifiersChanged { .. } => None,
244 InputEvent::MouseDown(event) => Some(event.position),
245 InputEvent::MouseUp(event) => Some(event.position),
246 InputEvent::MouseMove(event) => Some(event.position),
247 InputEvent::MouseExited(event) => Some(event.position),
248 InputEvent::ScrollWheel(event) => Some(event.position),
249 InputEvent::FileDrop(FileDropEvent::Exited) => None,
250 InputEvent::FileDrop(
251 FileDropEvent::Entered { position, .. }
252 | FileDropEvent::Pending { position, .. }
253 | FileDropEvent::Submit { position, .. },
254 ) => Some(*position),
255 }
256 }
257
258 pub fn mouse_event<'a>(&'a self) -> Option<&'a dyn Any> {
259 match self {
260 InputEvent::KeyDown { .. } => None,
261 InputEvent::KeyUp { .. } => None,
262 InputEvent::ModifiersChanged { .. } => None,
263 InputEvent::MouseDown(event) => Some(event),
264 InputEvent::MouseUp(event) => Some(event),
265 InputEvent::MouseMove(event) => Some(event),
266 InputEvent::MouseExited(event) => Some(event),
267 InputEvent::ScrollWheel(event) => Some(event),
268 InputEvent::FileDrop(event) => Some(event),
269 }
270 }
271
272 pub fn keyboard_event<'a>(&'a self) -> Option<&'a dyn Any> {
273 match self {
274 InputEvent::KeyDown(event) => Some(event),
275 InputEvent::KeyUp(event) => Some(event),
276 InputEvent::ModifiersChanged(event) => Some(event),
277 InputEvent::MouseDown(_) => None,
278 InputEvent::MouseUp(_) => None,
279 InputEvent::MouseMove(_) => None,
280 InputEvent::MouseExited(_) => None,
281 InputEvent::ScrollWheel(_) => None,
282 InputEvent::FileDrop(_) => None,
283 }
284 }
285}
286
287pub struct FocusEvent {
288 pub blurred: Option<FocusHandle>,
289 pub focused: Option<FocusHandle>,
290}
291
292#[cfg(test)]
293mod test {
294 use crate::{
295 self as gpui, div, Div, FocusHandle, InteractiveElement, IntoElement, KeyBinding,
296 Keystroke, ParentElement, Render, Stateful, TestAppContext, VisualContext,
297 };
298
299 struct TestView {
300 saw_key_down: bool,
301 saw_action: bool,
302 focus_handle: FocusHandle,
303 }
304
305 actions!(test, [TestAction]);
306
307 impl Render for TestView {
308 type Element = Stateful<Div>;
309
310 fn render(&mut self, cx: &mut gpui::ViewContext<Self>) -> Self::Element {
311 div().id("testview").child(
312 div()
313 .key_context("parent")
314 .on_key_down(cx.listener(|this, _, _| this.saw_key_down = true))
315 .on_action(
316 cx.listener(|this: &mut TestView, _: &TestAction, _| {
317 this.saw_action = true
318 }),
319 )
320 .child(
321 div()
322 .key_context("nested")
323 .track_focus(&self.focus_handle)
324 .into_element(),
325 ),
326 )
327 }
328 }
329
330 #[gpui::test]
331 fn test_on_events(cx: &mut TestAppContext) {
332 let window = cx.update(|cx| {
333 cx.open_window(Default::default(), |cx| {
334 cx.build_view(|cx| TestView {
335 saw_key_down: false,
336 saw_action: false,
337 focus_handle: cx.focus_handle(),
338 })
339 })
340 });
341
342 cx.update(|cx| {
343 cx.bind_keys(vec![KeyBinding::new("ctrl-g", TestAction, Some("parent"))]);
344 });
345
346 window
347 .update(cx, |test_view, cx| cx.focus(&test_view.focus_handle))
348 .unwrap();
349
350 cx.dispatch_keystroke(*window, Keystroke::parse("ctrl-g").unwrap(), false);
351
352 window
353 .update(cx, |test_view, _| {
354 assert!(test_view.saw_key_down || test_view.saw_action);
355 assert!(test_view.saw_key_down);
356 assert!(test_view.saw_action);
357 })
358 .unwrap();
359 }
360}