Add Link support to rich_text widget

core/src/renderer/null.rs

@@ -77,8 +77,8 @@ impl text::Paragraph for () {
 
     fn with_text(_text: Text<&str>) -> Self {}
 
-    fn with_spans(
-        _text: Text<&[text::Span<'_, Self::Font>], Self::Font>,
+    fn with_spans<Link>(
+        _text: Text<&[text::Span<'_, Link, Self::Font>], Self::Font>,
     ) -> Self {
     }
 
@@ -107,6 +107,10 @@ impl text::Paragraph for () {
     fn hit_test(&self, _point: Point) -> Option<text::Hit> {
         None
     }
+
+    fn hit_span(&self, _point: Point) -> Option<usize> {
+        None
+    }
 }
 
 impl text::Editor for () {

core/src/text.rs

@@ -223,8 +223,8 @@ pub trait Renderer: crate::Renderer {
 }
 
 /// A span of text.
-#[derive(Debug, Clone, PartialEq)]
-pub struct Span<'a, Font = crate::Font> {
+#[derive(Debug, Clone)]
+pub struct Span<'a, Link = (), Font = crate::Font> {
     /// The [`Fragment`] of text.
     pub text: Fragment<'a>,
     /// The size of the [`Span`] in [`Pixels`].
@@ -235,9 +235,11 @@ pub struct Span<'a, Font = crate::Font> {
     pub font: Option<Font>,
     /// The [`Color`] of the [`Span`].
     pub color: Option<Color>,
+    /// The link of the [`Span`].
+    pub link: Option<Link>,
 }
 
-impl<'a, Font> Span<'a, Font> {
+impl<'a, Link, Font> Span<'a, Link, Font> {
     /// Creates a new [`Span`] of text with the given text fragment.
     pub fn new(fragment: impl IntoFragment<'a>) -> Self {
         Self {
@@ -246,6 +248,7 @@ impl<'a, Font> Span<'a, Font> {
             line_height: None,
             font: None,
             color: None,
+            link: None,
         }
     }
 
@@ -285,14 +288,27 @@ impl<'a, Font> Span<'a, Font> {
         self
     }
 
+    /// Sets the link of the [`Span`].
+    pub fn link(mut self, link: impl Into<Link>) -> Self {
+        self.link = Some(link.into());
+        self
+    }
+
+    /// Sets the link of the [`Span`], if any.
+    pub fn link_maybe(mut self, link: Option<impl Into<Link>>) -> Self {
+        self.link = link.map(Into::into);
+        self
+    }
+
     /// Turns the [`Span`] into a static one.
-    pub fn to_static(self) -> Span<'static, Font> {
+    pub fn to_static(self) -> Span<'static, Link, Font> {
         Span {
             text: Cow::Owned(self.text.into_owned()),
             size: self.size,
             line_height: self.line_height,
             font: self.font,
             color: self.color,
+            link: self.link,
         }
     }
 }
@@ -303,6 +319,16 @@ impl<'a, Font> From<&'a str> for Span<'a, Font> {
     }
 }
 
+impl<'a, Link, Font: PartialEq> PartialEq for Span<'a, Link, Font> {
+    fn eq(&self, other: &Self) -> bool {
+        self.text == other.text
+            && self.size == other.size
+            && self.line_height == other.line_height
+            && self.font == other.font
+            && self.color == other.color
+    }
+}
+
 /// A fragment of [`Text`].
 ///
 /// This is just an alias to a string that may be either

core/src/text/paragraph.rs

@@ -12,7 +12,9 @@ pub trait Paragraph: Sized + Default {
     fn with_text(text: Text<&str, Self::Font>) -> Self;
 
     /// Creates a new [`Paragraph`] laid out with the given [`Text`].
-    fn with_spans(text: Text<&[Span<'_, Self::Font>], Self::Font>) -> Self;
+    fn with_spans<Link>(
+        text: Text<&[Span<'_, Link, Self::Font>], Self::Font>,
+    ) -> Self;
 
     /// Lays out the [`Paragraph`] with some new boundaries.
     fn resize(&mut self, new_bounds: Size);
@@ -35,6 +37,11 @@ pub trait Paragraph: Sized + Default {
     /// [`Paragraph`], returning information about the nearest character.
     fn hit_test(&self, point: Point) -> Option<Hit>;
 
+    /// Tests whether the provided point is within the boundaries of a
+    /// [`Span`] in the [`Paragraph`], returning the index of the [`Span`]
+    /// that was hit.
+    fn hit_span(&self, point: Point) -> Option<usize>;
+
     /// Returns the distance to the given grapheme index in the [`Paragraph`].
     fn grapheme_position(&self, line: usize, index: usize) -> Option<Point>;