1 files changed, 156 insertions, 0 deletions
diff --git a/native/src/style.rs b/native/src/style.rs
new file mode 100644
index 00000000..b1c49fd4
--- /dev/null
+++ b/native/src/style.rs
@@ -0,0 +1,156 @@
+use crate::{Align, Justify, Length};
+
+use stretch::style;
+
+/// The appearance of a [`Node`].
+///
+/// [`Node`]: struct.Node.html
+#[derive(Debug, Clone, Copy)]
+pub struct Style(pub(crate) style::Style);
+
+impl Default for Style {
+    fn default() -> Style {
+        Style::new()
+    }
+}
+
+impl Style {
+    /// Creates a new [`Style`].
+    ///
+    /// [`Style`]: struct.Style.html
+    pub fn new() -> Self {
+        Style(style::Style {
+            align_items: style::AlignItems::FlexStart,
+            justify_content: style::JustifyContent::FlexStart,
+            ..style::Style::default()
+        })
+    }
+
+    /// Defines the width of a [`Node`].
+    ///
+    /// [`Node`]: struct.Node.html
+    pub fn width(mut self, width: Length) -> Self {
+        self.0.size.width = into_dimension(width);
+        self
+    }
+
+    /// Defines the height of a [`Node`].
+    ///
+    /// [`Node`]: struct.Node.html
+    pub fn height(mut self, height: Length) -> Self {
+        self.0.size.height = into_dimension(height);
+        self
+    }
+
+    /// Defines the minimum width of a [`Node`].
+    ///
+    /// [`Node`]: struct.Node.html
+    pub fn min_width(mut self, min_width: Length) -> Self {
+        self.0.min_size.width = into_dimension(min_width);
+        self
+    }
+
+    /// Defines the maximum width of a [`Node`].
+    ///
+    /// [`Node`]: struct.Node.html
+    pub fn max_width(mut self, max_width: Length) -> Self {
+        self.0.max_size.width = into_dimension(max_width);
+        self
+    }
+
+    /// Defines the minimum height of a [`Node`].
+    ///
+    /// [`Node`]: struct.Node.html
+    pub fn min_height(mut self, min_height: Length) -> Self {
+        self.0.min_size.height = into_dimension(min_height);
+        self
+    }
+
+    /// Defines the maximum height of a [`Node`].
+    ///
+    /// [`Node`]: struct.Node.html
+    pub fn max_height(mut self, max_height: Length) -> Self {
+        self.0.max_size.height = into_dimension(max_height);
+        self
+    }
+
+    pub(crate) fn align_items(mut self, align: Align) -> Self {
+        self.0.align_items = into_align_items(align);
+        self
+    }
+
+    pub(crate) fn justify_content(mut self, justify: Justify) -> Self {
+        self.0.justify_content = into_justify_content(justify);
+        self
+    }
+
+    /// Sets the alignment of a [`Node`].
+    ///
+    /// If the [`Node`] is inside a...
+    ///
+    ///   * [`Column`], this setting will affect its __horizontal__ alignment.
+    ///   * [`Row`], this setting will affect its __vertical__ alignment.
+    ///
+    /// [`Node`]: struct.Node.html
+    /// [`Column`]: widget/struct.Column.html
+    /// [`Row`]: widget/struct.Row.html
+    pub fn align_self(mut self, align: Option<Align>) -> Self {
+        self.0.align_self = match align {
+            Some(align) => into_align_self(align),
+            None => stretch::style::AlignSelf::Auto,
+        };
+
+        self
+    }
+
+    /// Sets the padding of a [`Node`].
+    ///
+    /// [`Node`]: struct.Node.html
+    pub fn padding(mut self, units: u16) -> Self {
+        self.0.padding = stretch::geometry::Rect {
+            start: style::Dimension::Points(units as f32),
+            end: style::Dimension::Points(units as f32),
+            top: style::Dimension::Points(units as f32),
+            bottom: style::Dimension::Points(units as f32),
+        };
+
+        self
+    }
+}
+
+fn into_dimension(length: Length) -> style::Dimension {
+    match length {
+        Length::Shrink => style::Dimension::Undefined,
+        Length::Fill => style::Dimension::Percent(1.0),
+        Length::Units(units) => style::Dimension::Points(units as f32),
+    }
+}
+
+fn into_align_items(align: Align) -> style::AlignItems {
+    match align {
+        Align::Start => style::AlignItems::FlexStart,
+        Align::Center => style::AlignItems::Center,
+        Align::End => style::AlignItems::FlexEnd,
+        Align::Stretch => style::AlignItems::Stretch,
+    }
+}
+
+fn into_align_self(align: Align) -> style::AlignSelf {
+    match align {
+        Align::Start => style::AlignSelf::FlexStart,
+        Align::Center => style::AlignSelf::Center,
+        Align::End => style::AlignSelf::FlexEnd,
+        Align::Stretch => style::AlignSelf::Stretch,
+    }
+}
+
+fn into_justify_content(justify: Justify) -> style::JustifyContent {
+    match justify {
+        Justify::Start => style::JustifyContent::FlexStart,
+        Justify::Center => style::JustifyContent::Center,
+        Justify::End => style::JustifyContent::FlexEnd,
+        Justify::SpaceBetween => style::JustifyContent::SpaceBetween,
+        Justify::SpaceAround => style::JustifyContent::SpaceAround,
+        Justify::SpaceEvenly => style::JustifyContent::SpaceEvenly,
+    }
+}