Merge pull request #2163 from hicaru/svg_hover

added svg hover, for styles impl

Author: hecrj

style/src/svg.rs

@@ -20,4 +20,7 @@ pub trait StyleSheet {
 
     /// Produces the [`Appearance`] of the svg.
     fn appearance(&self, style: &Self::Style) -> Appearance;
+
+    /// Produces the hovered [`Appearance`] of a svg content.
+    fn hovered(&self, style: &Self::Style) -> Appearance;
 }

style/src/theme.rs

@@ -939,6 +939,10 @@ impl svg::StyleSheet for Theme {
             Svg::Custom(custom) => custom.appearance(self),
         }
     }
+
+    fn hovered(&self, style: &Self::Style) -> svg::Appearance {
+        self.appearance(style)
+    }
 }
 
 impl svg::StyleSheet for fn(&Theme) -> svg::Appearance {
@@ -947,6 +951,10 @@ impl svg::StyleSheet for fn(&Theme) -> svg::Appearance {
     fn appearance(&self, style: &Self::Style) -> svg::Appearance {
         (self)(style)
     }
+
+    fn hovered(&self, style: &Self::Style) -> svg::Appearance {
+        self.appearance(style)
+    }
 }
 
 /// The style of a scrollable.

widget/src/svg.rs

@@ -141,14 +141,15 @@ where
         theme: &Renderer::Theme,
         _style: &renderer::Style,
         layout: Layout<'_>,
-        _cursor: mouse::Cursor,
+        cursor: mouse::Cursor,
         _viewport: &Rectangle,
     ) {
         let Size { width, height } = renderer.dimensions(&self.handle);
         let image_size = Size::new(width as f32, height as f32);
 
         let bounds = layout.bounds();
         let adjusted_fit = self.content_fit.fit(image_size, bounds.size());
+        let is_mouse_over = cursor.is_over(bounds);
 
         let render = |renderer: &mut Renderer| {
             let offset = Vector::new(
@@ -162,7 +163,11 @@ where
                 ..bounds
             };
 
-            let appearance = theme.appearance(&self.style);
+            let appearance = if is_mouse_over {
+                theme.hovered(&self.style)
+            } else {
+                theme.appearance(&self.style)
+            };
 
             renderer.draw(
                 self.handle.clone(),