added FillMode enum style for the Rule widget

style/src/rule.rs

@@ -2,6 +2,23 @@
 
 use iced_core::Color;
 
+/// The fill mode of a rule.
+#[derive(Debug, Clone, Copy)]
+pub enum FillMode {
+    /// Fill the whole length of the container.
+    Full,
+    /// Fill a percent of the length of the container. The rule
+    /// will be centered in that container.
+    ///
+    /// The range is `[0.0, 100.0]`.
+    Percent(f32),
+    /// Uniform offset from each end, length units.
+    Padded(u16),
+    /// Different offset on each end of the rule, length units.
+    /// First = top or left.
+    AsymmetricPadding(u16, u16),
+}
+
 /// The appearance of a rule.
 #[derive(Debug, Clone, Copy)]
 pub struct Style {
@@ -11,9 +28,10 @@ pub struct Style {
     pub width: u16,
     /// The radius of the rectangle corners.
     pub radius: u16,
-    /// The percent from [0, 100] of the filled space the rule
-    /// will be drawn.
-    pub fill_percent: u16,
+    /// The [`FillMode`] of the rule.
+    ///
+    /// [`FillMode`]: enum.FillMode.html
+    pub fill_mode: FillMode,
 }
 
 /// A set of rules that dictate the style of a rule.
@@ -27,10 +45,10 @@ struct Default;
 impl StyleSheet for Default {
     fn style(&self) -> Style {
         Style {
-            color: [0.6, 0.6, 0.6, 0.49].into(),
+            color: [0.6, 0.6, 0.6, 0.51].into(),
             width: 1,
             radius: 0,
-            fill_percent: 90,
+            fill_mode: FillMode::Percent(90.0),
         }
     }
 }