Introduce text::Shaping enum and replace magic boolean

core/src/renderer/null.rs

@@ -62,7 +62,7 @@ impl text::Renderer for Null {
         _size: f32,
         _font: Font,
         _bounds: Size,
-        _needs_shaping: bool,
+        _shaping: text::Shaping,
     ) -> (f32, f32) {
         (0.0, 20.0)
     }
@@ -73,9 +73,9 @@ impl text::Renderer for Null {
         _size: f32,
         _font: Self::Font,
         _bounds: Size,
+        _shaping: text::Shaping,
         _point: Point,
         _nearest_only: bool,
-        _advanced_shape: bool,
     ) -> Option<text::Hit> {
         None
     }

core/src/text.rs

@@ -28,14 +28,32 @@ pub struct Text<'a, Font> {
     /// The vertical alignment of the [`Text`].
     pub vertical_alignment: alignment::Vertical,
 
-    /// Whether the [`Text`] needs advanced shaping and font fallback.
+    /// The [`Shaping`] strategy of the [`Text`].
+    pub shaping: Shaping,
+}
+
+/// The shaping strategy of some text.
+#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash, Default)]
+pub enum Shaping {
+    /// No shaping and no font fallback.
+    ///
+    /// This shaping strategy is very cheap, but it will not display complex
+    /// scripts properly nor try to find missing glyphs in your system fonts.
+    ///
+    /// You should use this strategy when you have complete control of the text
+    /// and the font you are displaying in your application.
+    ///
+    /// This is the default.
+    #[default]
+    Basic,
+    /// Advanced text shaping and font fallback.
     ///
     /// You will need to enable this flag if the text contains a complex
     /// script, the font used needs it, and/or multiple fonts in your system
     /// may be needed to display all of the glyphs.
     ///
     /// Advanced shaping is expensive! You should only enable it when necessary.
-    pub advanced_shape: bool,
+    Advanced,
 }
 
 /// The result of hit testing on text.
@@ -86,7 +104,7 @@ pub trait Renderer: crate::Renderer {
         size: f32,
         font: Self::Font,
         bounds: Size,
-        advanced_shape: bool,
+        shaping: Shaping,
     ) -> (f32, f32);
 
     /// Measures the width of the text as if it were laid out in a single line.
@@ -95,10 +113,10 @@ pub trait Renderer: crate::Renderer {
         content: &str,
         size: f32,
         font: Self::Font,
-        advanced_shape: bool,
+        shaping: Shaping,
     ) -> f32 {
         let (width, _) =
-            self.measure(content, size, font, Size::INFINITY, advanced_shape);
+            self.measure(content, size, font, Size::INFINITY, shaping);
 
         width
     }
@@ -116,9 +134,9 @@ pub trait Renderer: crate::Renderer {
         size: f32,
         font: Self::Font,
         bounds: Size,
+        shaping: Shaping,
         point: Point,
         nearest_only: bool,
-        advanced_shape: bool,
     ) -> Option<Hit>;
 
     /// Loads a [`Self::Font`] from its bytes.

core/src/widget/text.rs

@@ -24,8 +24,8 @@ where
     horizontal_alignment: alignment::Horizontal,
     vertical_alignment: alignment::Vertical,
     font: Option<Renderer::Font>,
+    shaping: text::Shaping,
     style: <Renderer::Theme as StyleSheet>::Style,
-    advanced_shape: bool,
 }
 
 impl<'a, Renderer> Text<'a, Renderer>
@@ -43,8 +43,8 @@ where
             height: Length::Shrink,
             horizontal_alignment: alignment::Horizontal::Left,
             vertical_alignment: alignment::Vertical::Top,
+            shaping: text::Shaping::Basic,
             style: Default::default(),
-            advanced_shape: false,
         }
     }
 
@@ -101,17 +101,9 @@ where
         self
     }
 
-    /// Enables advanced text shaping and font fallback for the [`Text`].
-    ///
-    /// You will need to enable this if the text contains a complex script, the
-    /// font used needs it, and/or multiple fonts in your system may be needed
-    /// to display all of the glyphs.
-    ///
-    /// If your text isn't displaying properly, try enabling this!
-    ///
-    /// Advanced shaping is expensive! You should only enable it when necessary.
-    pub fn advanced_shape(mut self) -> Self {
-        self.advanced_shape = true;
+    /// Sets the [`text::Shaping`] strategy of the [`Text`].
+    pub fn shaping(mut self, shaping: text::Shaping) -> Self {
+        self.shaping = shaping;
         self
     }
 }
@@ -145,7 +137,7 @@ where
             size,
             self.font.unwrap_or_else(|| renderer.default_font()),
             bounds,
-            self.advanced_shape,
+            self.shaping,
         );
 
         let size = limits.resolve(Size::new(width, height));
@@ -173,7 +165,7 @@ where
             theme.appearance(self.style.clone()),
             self.horizontal_alignment,
             self.vertical_alignment,
-            self.advanced_shape,
+            self.shaping,
         );
     }
 }
@@ -198,7 +190,7 @@ pub fn draw<Renderer>(
     appearance: Appearance,
     horizontal_alignment: alignment::Horizontal,
     vertical_alignment: alignment::Vertical,
-    advanced_shape: bool,
+    shaping: text::Shaping,
 ) where
     Renderer: text::Renderer,
 {
@@ -224,7 +216,7 @@ pub fn draw<Renderer>(
         font: font.unwrap_or_else(|| renderer.default_font()),
         horizontal_alignment,
         vertical_alignment,
-        advanced_shape,
+        shaping,
     });
 }
 
@@ -254,7 +246,7 @@ where
             vertical_alignment: self.vertical_alignment,
             font: self.font,
             style: self.style.clone(),
-            advanced_shape: self.advanced_shape,
+            shaping: self.shaping,
         }
     }
 }