Merge pull request #1550 from bungoboingo/feat/multidirectional-scrolling

[Feature] Multidirectional scrolling

style/src/scrollable.rs

@@ -37,11 +37,26 @@ pub trait StyleSheet {
     /// Produces the style of an active scrollbar.
     fn active(&self, style: &Self::Style) -> Scrollbar;
 
-    /// Produces the style of an hovered scrollbar.
+    /// Produces the style of a hovered scrollbar.
     fn hovered(&self, style: &Self::Style) -> Scrollbar;
 
     /// Produces the style of a scrollbar that is being dragged.
     fn dragging(&self, style: &Self::Style) -> Scrollbar {
         self.hovered(style)
     }
+
+    /// Produces the style of an active horizontal scrollbar.
+    fn active_horizontal(&self, style: &Self::Style) -> Scrollbar {
+        self.active(style)
+    }
+
+    /// Produces the style of a hovered horizontal scrollbar.
+    fn hovered_horizontal(&self, style: &Self::Style) -> Scrollbar {
+        self.hovered(style)
+    }
+
+    /// Produces the style of a horizontal scrollbar that is being dragged.
+    fn dragging_horizontal(&self, style: &Self::Style) -> Scrollbar {
+        self.hovered_horizontal(style)
+    }
 }

style/src/theme.rs

@@ -872,6 +872,15 @@ pub enum Scrollable {
     Custom(Box<dyn scrollable::StyleSheet<Style = Theme>>),
 }
 
+impl Scrollable {
+    /// Creates a custom [`Scrollable`] theme.
+    pub fn custom<T: scrollable::StyleSheet<Style = Theme> + 'static>(
+        style: T,
+    ) -> Self {
+        Self::Custom(Box::new(style))
+    }
+}
+
 impl scrollable::StyleSheet for Theme {
     type Style = Scrollable;
 
@@ -925,6 +934,30 @@ impl scrollable::StyleSheet for Theme {
             Scrollable::Custom(custom) => custom.dragging(self),
         }
     }
+
+    fn active_horizontal(&self, style: &Self::Style) -> scrollable::Scrollbar {
+        match style {
+            Scrollable::Default => self.active(style),
+            Scrollable::Custom(custom) => custom.active_horizontal(self),
+        }
+    }
+
+    fn hovered_horizontal(&self, style: &Self::Style) -> scrollable::Scrollbar {
+        match style {
+            Scrollable::Default => self.hovered(style),
+            Scrollable::Custom(custom) => custom.hovered_horizontal(self),
+        }
+    }
+
+    fn dragging_horizontal(
+        &self,
+        style: &Self::Style,
+    ) -> scrollable::Scrollbar {
+        match style {
+            Scrollable::Default => self.hovered_horizontal(style),
+            Scrollable::Custom(custom) => custom.dragging_horizontal(self),
+        }
+    }
 }
 
 /// The style of text.