Text paragraphs, styling, fontconfig

lib/ui/src/tree.rs

@@ -1,5 +1,5 @@
 use crate::scene::Color;
-use crate::text::{TextStyle, TextWrap};
+use crate::text::{TextSpan, TextStyle, TextWrap};
 
 #[derive(Clone, Copy, Debug, Eq, PartialEq)]
 pub enum FlexDirection {
@@ -75,7 +75,7 @@ enum ElementContent {
 
 #[derive(Clone, Debug, PartialEq)]
 pub(crate) struct TextNode {
-    pub text: String,
+    pub spans: Vec<TextSpan>,
     pub style: TextStyle,
 }
 
@@ -96,11 +96,15 @@ impl Element {
     }
 
     pub fn text(text: impl Into<String>, style: TextStyle) -> Self {
+        Self::spans([TextSpan::new(text)], style)
+    }
+
+    pub fn spans(spans: impl IntoIterator<Item = TextSpan>, style: TextStyle) -> Self {
         Self {
             style: Style::default(),
             children: Vec::new(),
             content: ElementContent::Text(TextNode {
-                text: text.into(),
+                spans: spans.into_iter().collect(),
                 style,
             }),
         }
@@ -110,6 +114,10 @@ impl Element {
         Self::text(text, style.with_wrap(TextWrap::Word))
     }
 
+    pub fn rich_paragraph(spans: impl IntoIterator<Item = TextSpan>, style: TextStyle) -> Self {
+        Self::spans(spans, style.with_wrap(TextWrap::Word))
+    }
+
     pub fn row() -> Self {
         Self::new().direction(FlexDirection::Row)
     }