Overhaul Font type to allow font family selection

graphics/src/backend.rs

@@ -31,6 +31,9 @@ pub trait Text {
     /// [`ICON_FONT`]: Self::ICON_FONT
     const ARROW_DOWN_ICON: char;
 
+    /// Returns the default [`Font`].
+    fn default_font(&self) -> Font;
+
     /// Returns the default size of text.
     fn default_size(&self) -> f32;
 

graphics/src/layer.rs

@@ -63,7 +63,7 @@ impl<'a> Layer<'a> {
                 ),
                 color: Color::new(0.9, 0.9, 0.9, 1.0),
                 size: 20.0,
-                font: Font::Default,
+                font: Font::Monospace,
                 horizontal_alignment: alignment::Horizontal::Left,
                 vertical_alignment: alignment::Vertical::Top,
             };

graphics/src/renderer.rs

@@ -130,6 +130,10 @@ where
     const CHECKMARK_ICON: char = B::CHECKMARK_ICON;
     const ARROW_DOWN_ICON: char = B::ARROW_DOWN_ICON;
 
+    fn default_font(&self) -> Self::Font {
+        self.backend().default_font()
+    }
+
     fn default_size(&self) -> f32 {
         self.backend().default_size()
     }

graphics/src/widget/canvas/text.rs

@@ -34,7 +34,7 @@ impl Default for Text {
             position: Point::ORIGIN,
             color: Color::BLACK,
             size: 16.0,
-            font: Font::Default,
+            font: Font::SansSerif,
             horizontal_alignment: alignment::Horizontal::Left,
             vertical_alignment: alignment::Vertical::Top,
         }