Create `iced_core` and `iced_native`

1 files changed, 170 insertions, 0 deletions

diff --git a/native/src/style.rs b/native/src/style.rs
new file mode 100644
index 00000000..3a75c925
--- /dev/null
+++ b/native/src/style.rs
@@ -0,0 +1,170 @@
+use crate::{Align, Justify, Length};
+
+use std::hash::{Hash, Hasher};
+use stretch::{geometry, style};
+
+/// The appearance of a [`Node`].
+///
+/// [`Node`]: struct.Node.html
+#[derive(Debug, Clone, Copy)]
+pub struct Style(pub(crate) style::Style);
+
+impl Style {
+    /// Defines the width of a [`Node`].
+    ///
+    /// [`Node`]: struct.Node.html
+    pub fn width(mut self, width: Length) -> Self {
+        self.0.size.width = length_to_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 = length_to_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 = length_to_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 = length_to_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 = length_to_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 = length_to_dimension(max_height);
+        self
+    }
+
+    pub(crate) fn align_items(mut self, align: Align) -> Self {
+        self.0.align_items = align.into();
+        self
+    }
+
+    pub(crate) fn justify_content(mut self, justify: Justify) -> Self {
+        self.0.justify_content = justify.into();
+        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) => align.into(),
+            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 length_to_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),
+    }
+}
+
+impl Default for Style {
+    fn default() -> Style {
+        Style(style::Style {
+            align_items: style::AlignItems::FlexStart,
+            justify_content: style::JustifyContent::FlexStart,
+            ..style::Style::default()
+        })
+    }
+}
+
+impl Hash for Style {
+    fn hash<H: Hasher>(&self, state: &mut H) {
+        hash_size(&self.0.size, state);
+        hash_size(&self.0.min_size, state);
+        hash_size(&self.0.max_size, state);
+
+        hash_rect(&self.0.margin, state);
+
+        (self.0.flex_direction as u8).hash(state);
+        (self.0.align_items as u8).hash(state);
+        (self.0.justify_content as u8).hash(state);
+        (self.0.align_self as u8).hash(state);
+        (self.0.flex_grow as u32).hash(state);
+    }
+}
+
+fn hash_size<H: Hasher>(
+    size: &geometry::Size<style::Dimension>,
+    state: &mut H,
+) {
+    hash_dimension(size.width, state);
+    hash_dimension(size.height, state);
+}
+
+fn hash_rect<H: Hasher>(
+    rect: &geometry::Rect<style::Dimension>,
+    state: &mut H,
+) {
+    hash_dimension(rect.start, state);
+    hash_dimension(rect.end, state);
+    hash_dimension(rect.top, state);
+    hash_dimension(rect.bottom, state);
+}
+
+fn hash_dimension<H: Hasher>(dimension: style::Dimension, state: &mut H) {
+    match dimension {
+        style::Dimension::Undefined => state.write_u8(0),
+        style::Dimension::Auto => state.write_u8(1),
+        style::Dimension::Points(points) => {
+            state.write_u8(2);
+            (points as u32).hash(state);
+        }
+        style::Dimension::Percent(percent) => {
+            state.write_u8(3);
+            (percent as u32).hash(state);
+        }
+    }
+}