Implement `Row` in `iced_pure`

1 files changed, 223 insertions, 0 deletions

diff --git a/pure/src/widget/row.rs b/pure/src/widget/row.rs
new file mode 100644
index 00000000..2581b38a
--- /dev/null
+++ b/pure/src/widget/row.rs
@@ -0,0 +1,223 @@
+use crate::flex;
+use crate::widget::{Element, Tree, Widget};
+
+use iced_native::event::{self, Event};
+use iced_native::layout::{self, Layout};
+use iced_native::mouse;
+use iced_native::renderer;
+use iced_native::{
+    Alignment, Clipboard, Hasher, Length, Padding, Point, Rectangle, Shell,
+};
+
+use std::any::{self, Any};
+
+pub struct Row<'a, Message, Renderer> {
+    spacing: u16,
+    padding: Padding,
+    width: Length,
+    height: Length,
+    align_items: Alignment,
+    children: Vec<Element<'a, Message, Renderer>>,
+}
+
+impl<'a, Message, Renderer> Row<'a, Message, Renderer> {
+    pub fn new() -> Self {
+        Self::with_children(Vec::new())
+    }
+
+    pub fn with_children(
+        children: Vec<Element<'a, Message, Renderer>>,
+    ) -> Self {
+        Row {
+            spacing: 0,
+            padding: Padding::ZERO,
+            width: Length::Shrink,
+            height: Length::Shrink,
+            align_items: Alignment::Start,
+            children,
+        }
+    }
+
+    pub fn spacing(mut self, units: u16) -> Self {
+        self.spacing = units;
+        self
+    }
+
+    pub fn padding<P: Into<Padding>>(mut self, padding: P) -> Self {
+        self.padding = padding.into();
+        self
+    }
+
+    pub fn width(mut self, width: Length) -> Self {
+        self.width = width;
+        self
+    }
+
+    pub fn height(mut self, height: Length) -> Self {
+        self.height = height;
+        self
+    }
+
+    pub fn align_items(mut self, align: Alignment) -> Self {
+        self.align_items = align;
+        self
+    }
+
+    pub fn push(
+        mut self,
+        child: impl Into<Element<'a, Message, Renderer>>,
+    ) -> Self {
+        self.children.push(child.into());
+        self
+    }
+}
+
+impl<'a, Message, Renderer> Widget<Message, Renderer>
+    for Row<'a, Message, Renderer>
+where
+    Renderer: iced_native::Renderer,
+{
+    fn tag(&self) -> any::TypeId {
+        struct Marker;
+        any::TypeId::of::<Marker>()
+    }
+
+    fn state(&self) -> Box<dyn Any> {
+        Box::new(())
+    }
+
+    fn children(&self) -> &[Element<Message, Renderer>] {
+        &self.children
+    }
+
+    fn width(&self) -> Length {
+        self.width
+    }
+
+    fn height(&self) -> Length {
+        self.height
+    }
+
+    fn layout(
+        &self,
+        renderer: &Renderer,
+        limits: &layout::Limits,
+    ) -> layout::Node {
+        let limits = limits.width(self.width).height(self.height);
+
+        flex::resolve(
+            flex::Axis::Horizontal,
+            renderer,
+            &limits,
+            self.padding,
+            self.spacing as f32,
+            self.align_items,
+            &self.children,
+        )
+    }
+
+    fn on_event(
+        &mut self,
+        tree: &mut Tree,
+        event: Event,
+        layout: Layout<'_>,
+        cursor_position: Point,
+        renderer: &Renderer,
+        clipboard: &mut dyn Clipboard,
+        shell: &mut Shell<'_, Message>,
+    ) -> event::Status {
+        self.children
+            .iter_mut()
+            .zip(&mut tree.children)
+            .zip(layout.children())
+            .map(|((child, state), layout)| {
+                child.as_widget_mut().on_event(
+                    state,
+                    event.clone(),
+                    layout,
+                    cursor_position,
+                    renderer,
+                    clipboard,
+                    shell,
+                )
+            })
+            .fold(event::Status::Ignored, event::Status::merge)
+    }
+
+    fn mouse_interaction(
+        &self,
+        tree: &Tree,
+        layout: Layout<'_>,
+        cursor_position: Point,
+        viewport: &Rectangle,
+        renderer: &Renderer,
+    ) -> mouse::Interaction {
+        self.children
+            .iter()
+            .zip(&tree.children)
+            .zip(layout.children())
+            .map(|((child, state), layout)| {
+                child.as_widget().mouse_interaction(
+                    state,
+                    layout,
+                    cursor_position,
+                    viewport,
+                    renderer,
+                )
+            })
+            .max()
+            .unwrap_or_default()
+    }
+
+    fn draw(
+        &self,
+        tree: &Tree,
+        renderer: &mut Renderer,
+        style: &renderer::Style,
+        layout: Layout<'_>,
+        cursor_position: Point,
+        viewport: &Rectangle,
+    ) {
+        for ((child, state), layout) in self
+            .children
+            .iter()
+            .zip(&tree.children)
+            .zip(layout.children())
+        {
+            child.as_widget().draw(
+                state,
+                renderer,
+                style,
+                layout,
+                cursor_position,
+                viewport,
+            );
+        }
+    }
+
+    fn hash_layout(&self, state: &mut Hasher) {
+        use std::hash::Hash;
+
+        self.tag().hash(state);
+        self.width.hash(state);
+        self.height.hash(state);
+        self.align_items.hash(state);
+        self.spacing.hash(state);
+        self.padding.hash(state);
+
+        for child in &self.children {
+            child.as_widget().hash_layout(state);
+        }
+    }
+}
+
+impl<'a, Message, Renderer> Into<Element<'a, Message, Renderer>>
+    for Row<'a, Message, Renderer>
+where
+    Message: 'static,
+    Renderer: iced_native::Renderer + 'static,
+{
+    fn into(self) -> Element<'a, Message, Renderer> {
+        Element::new(self)
+    }
+}