cranpose_ui/widgets/
clickable_text.rs

1//! ClickableText widget for handling clicks on annotated text.
2//!
3//! Mirrors Jetpack Compose's `ClickableText` from:
4//! `compose/foundation/foundation/src/commonMain/kotlin/androidx/compose/foundation/text/ClickableText.kt`
5
6#![expect(non_snake_case)]
7
8use std::rc::Rc;
9
10use cranpose_core::NodeId;
11
12use crate::{
13    modifier::Modifier,
14    text::{AnnotatedString, TextOverflow, TextStyle},
15    widgets::BasicText,
16};
17
18#[doc(hidden)]
19pub trait IntoSharedAnnotatedString {
20    fn into_shared(self) -> Rc<AnnotatedString>;
21}
22
23impl IntoSharedAnnotatedString for AnnotatedString {
24    fn into_shared(self) -> Rc<AnnotatedString> {
25        Rc::new(self)
26    }
27}
28
29impl IntoSharedAnnotatedString for Rc<AnnotatedString> {
30    fn into_shared(self) -> Rc<AnnotatedString> {
31        self
32    }
33}
34
35/// Displays an [`AnnotatedString`] and calls `on_click` with the **byte offset** of the character
36/// under the pointer at the time of the click.
37///
38/// Callers typically use the offset to query string annotations:
39///
40/// ```rust,ignore
41/// ClickableText(
42///     text.clone(),
43///     Modifier::empty(),
44///     TextStyle::default(),
45///     |offset| {
46///         for ann in text.get_string_annotations("URL", offset, offset + 1) {
47///             uri_handler.open_uri(&ann.item.annotation).ok();
48///         }
49///     },
50/// );
51/// ```
52///
53/// # JC parity
54///
55/// ```kotlin
56/// @Composable
57/// fun ClickableText(
58///     text: AnnotatedString,
59///     modifier: Modifier = Modifier,
60///     style: TextStyle = TextStyle.Default,
61///     onClick: (Int) -> Unit,
62/// )
63/// ```
64pub fn ClickableText<T>(
65    text: T,
66    modifier: Modifier,
67    style: TextStyle,
68    on_click: impl Fn(usize) + 'static,
69) -> NodeId
70where
71    T: IntoSharedAnnotatedString,
72{
73    let text = text.into_shared();
74    let text_for_click = text.clone();
75    let style_for_click = style.clone();
76    let on_click: Rc<dyn Fn(usize)> = Rc::new(on_click);
77
78    let clickable_modifier = modifier.clickable(move |point| {
79        let offset = crate::text::get_offset_for_position(
80            &text_for_click,
81            &style_for_click,
82            point.x,
83            point.y,
84        );
85        on_click(offset);
86    });
87
88    BasicText(
89        text,
90        clickable_modifier,
91        style,
92        TextOverflow::Clip,
93        true,
94        usize::MAX,
95        1,
96    )
97}
98
99#[cfg(test)]
100mod tests {
101    use cranpose_core::{Composition, MemoryApplier, location_key};
102
103    use super::*;
104
105    #[test]
106    fn clickable_text_composes_without_panic() {
107        let _app_context = crate::render_state::app_context_test_scope();
108        let mut comp = Composition::new(MemoryApplier::new());
109        comp.render(location_key(file!(), line!(), column!()), || {
110            ClickableText(
111                AnnotatedString::from("Hello"),
112                Modifier::empty(),
113                TextStyle::default(),
114                |_offset| {},
115            );
116        })
117        .expect("composition succeeds");
118    }
119}
cranpose_ui/widgets/clickable_text.rs

cranpose_ui/widgets/
clickable_text.rs
