1use crate::{
2 div, AnyElement, BorrowWindow, Bounds, Component, Div, DivState, Element, ElementFocus,
3 ElementId, ElementInteraction, FocusDisabled, FocusEnabled, FocusListeners, Focusable,
4 LayoutId, Pixels, SharedString, StatefulInteraction, StatefulInteractive, StatelessInteraction,
5 StatelessInteractive, StyleRefinement, Styled, ViewContext,
6};
7use futures::FutureExt;
8use util::ResultExt;
9
10pub struct Img<
11 V: 'static,
12 I: ElementInteraction<V> = StatelessInteraction<V>,
13 F: ElementFocus<V> = FocusDisabled,
14> {
15 base: Div<V, I, F>,
16 uri: Option<SharedString>,
17 grayscale: bool,
18}
19
20pub fn img<V: 'static>() -> Img<V, StatelessInteraction<V>, FocusDisabled> {
21 Img {
22 base: div(),
23 uri: None,
24 grayscale: false,
25 }
26}
27
28impl<V, I, F> Img<V, I, F>
29where
30 V: 'static,
31 I: ElementInteraction<V>,
32 F: ElementFocus<V>,
33{
34 pub fn uri(mut self, uri: impl Into<SharedString>) -> Self {
35 self.uri = Some(uri.into());
36 self
37 }
38
39 pub fn grayscale(mut self, grayscale: bool) -> Self {
40 self.grayscale = grayscale;
41 self
42 }
43}
44
45impl<V, F> Img<V, StatelessInteraction<V>, F>
46where
47 F: ElementFocus<V>,
48{
49 pub fn id(self, id: impl Into<ElementId>) -> Img<V, StatefulInteraction<V>, F> {
50 Img {
51 base: self.base.id(id),
52 uri: self.uri,
53 grayscale: self.grayscale,
54 }
55 }
56}
57
58impl<V, I, F> Component<V> for Img<V, I, F>
59where
60 I: ElementInteraction<V>,
61 F: ElementFocus<V>,
62{
63 fn render(self) -> AnyElement<V> {
64 AnyElement::new(self)
65 }
66}
67
68impl<V, I, F> Element<V> for Img<V, I, F>
69where
70 I: ElementInteraction<V>,
71 F: ElementFocus<V>,
72{
73 type ElementState = DivState;
74
75 fn id(&self) -> Option<crate::ElementId> {
76 self.base.id()
77 }
78
79 fn initialize(
80 &mut self,
81 view_state: &mut V,
82 element_state: Option<Self::ElementState>,
83 cx: &mut ViewContext<V>,
84 ) -> Self::ElementState {
85 self.base.initialize(view_state, element_state, cx)
86 }
87
88 fn layout(
89 &mut self,
90 view_state: &mut V,
91 element_state: &mut Self::ElementState,
92 cx: &mut ViewContext<V>,
93 ) -> LayoutId {
94 self.base.layout(view_state, element_state, cx)
95 }
96
97 fn paint(
98 &mut self,
99 bounds: Bounds<Pixels>,
100 view: &mut V,
101 element_state: &mut Self::ElementState,
102 cx: &mut ViewContext<V>,
103 ) {
104 cx.stack(0, |cx| {
105 self.base.paint(bounds, view, element_state, cx);
106 });
107
108 let style = self.base.compute_style(bounds, element_state, cx);
109 let corner_radii = style.corner_radii;
110
111 if let Some(uri) = self.uri.clone() {
112 let image_future = cx.image_cache.get(uri);
113 if let Some(data) = image_future
114 .clone()
115 .now_or_never()
116 .and_then(ResultExt::log_err)
117 {
118 let corner_radii = corner_radii.to_pixels(bounds.size, cx.rem_size());
119 cx.stack(1, |cx| {
120 cx.paint_image(bounds, corner_radii, data, self.grayscale)
121 .log_err()
122 });
123 } else {
124 cx.spawn(|_, mut cx| async move {
125 if image_future.await.log_err().is_some() {
126 cx.on_next_frame(|cx| cx.notify());
127 }
128 })
129 .detach()
130 }
131 }
132 }
133}
134
135impl<V, I, F> Styled for Img<V, I, F>
136where
137 I: ElementInteraction<V>,
138 F: ElementFocus<V>,
139{
140 fn style(&mut self) -> &mut StyleRefinement {
141 self.base.style()
142 }
143}
144
145impl<V, I, F> StatelessInteractive<V> for Img<V, I, F>
146where
147 I: ElementInteraction<V>,
148 F: ElementFocus<V>,
149{
150 fn stateless_interaction(&mut self) -> &mut StatelessInteraction<V> {
151 self.base.stateless_interaction()
152 }
153}
154
155impl<V, F> StatefulInteractive<V> for Img<V, StatefulInteraction<V>, F>
156where
157 F: ElementFocus<V>,
158{
159 fn stateful_interaction(&mut self) -> &mut StatefulInteraction<V> {
160 self.base.stateful_interaction()
161 }
162}
163
164impl<V, I> Focusable<V> for Img<V, I, FocusEnabled<V>>
165where
166 V: 'static,
167 I: ElementInteraction<V>,
168{
169 fn focus_listeners(&mut self) -> &mut FocusListeners<V> {
170 self.base.focus_listeners()
171 }
172
173 fn set_focus_style(&mut self, style: StyleRefinement) {
174 self.base.set_focus_style(style)
175 }
176
177 fn set_focus_in_style(&mut self, style: StyleRefinement) {
178 self.base.set_focus_in_style(style)
179 }
180
181 fn set_in_focus_style(&mut self, style: StyleRefinement) {
182 self.base.set_in_focus_style(style)
183 }
184}