Create `iced_widget` subcrate and re-organize the whole codebase

1 files changed, 253 insertions, 0 deletions

diff --git a/widget/src/row.rs b/widget/src/row.rs
new file mode 100644
index 00000000..3ce363f8
--- /dev/null
+++ b/widget/src/row.rs
@@ -0,0 +1,253 @@
+//! Distribute content horizontally.
+use crate::core::event::{self, Event};
+use crate::core::layout::{self, Layout};
+use crate::core::mouse;
+use crate::core::overlay;
+use crate::core::renderer;
+use crate::core::widget::{Operation, Tree};
+use crate::core::{
+    Alignment, Clipboard, Element, Length, Padding, Pixels, Point, Rectangle,
+    Shell, Widget,
+};
+
+/// A container that distributes its contents horizontally.
+#[allow(missing_debug_implementations)]
+pub struct Row<'a, Message, Renderer = crate::Renderer> {
+    spacing: f32,
+    padding: Padding,
+    width: Length,
+    height: Length,
+    align_items: Alignment,
+    children: Vec<Element<'a, Message, Renderer>>,
+}
+
+impl<'a, Message, Renderer> Row<'a, Message, Renderer> {
+    /// Creates an empty [`Row`].
+    pub fn new() -> Self {
+        Self::with_children(Vec::new())
+    }
+
+    /// Creates a [`Row`] with the given elements.
+    pub fn with_children(
+        children: Vec<Element<'a, Message, Renderer>>,
+    ) -> Self {
+        Row {
+            spacing: 0.0,
+            padding: Padding::ZERO,
+            width: Length::Shrink,
+            height: Length::Shrink,
+            align_items: Alignment::Start,
+            children,
+        }
+    }
+
+    /// Sets the horizontal spacing _between_ elements.
+    ///
+    /// Custom margins per element do not exist in iced. You should use this
+    /// method instead! While less flexible, it helps you keep spacing between
+    /// elements consistent.
+    pub fn spacing(mut self, amount: impl Into<Pixels>) -> Self {
+        self.spacing = amount.into().0;
+        self
+    }
+
+    /// Sets the [`Padding`] of the [`Row`].
+    pub fn padding<P: Into<Padding>>(mut self, padding: P) -> Self {
+        self.padding = padding.into();
+        self
+    }
+
+    /// Sets the width of the [`Row`].
+    pub fn width(mut self, width: impl Into<Length>) -> Self {
+        self.width = width.into();
+        self
+    }
+
+    /// Sets the height of the [`Row`].
+    pub fn height(mut self, height: impl Into<Length>) -> Self {
+        self.height = height.into();
+        self
+    }
+
+    /// Sets the vertical alignment of the contents of the [`Row`] .
+    pub fn align_items(mut self, align: Alignment) -> Self {
+        self.align_items = align;
+        self
+    }
+
+    /// Adds an [`Element`] to the [`Row`].
+    pub fn push(
+        mut self,
+        child: impl Into<Element<'a, Message, Renderer>>,
+    ) -> Self {
+        self.children.push(child.into());
+        self
+    }
+}
+
+impl<'a, Message, Renderer> Default for Row<'a, Message, Renderer> {
+    fn default() -> Self {
+        Self::new()
+    }
+}
+
+impl<'a, Message, Renderer> Widget<Message, Renderer>
+    for Row<'a, Message, Renderer>
+where
+    Renderer: crate::core::Renderer,
+{
+    fn children(&self) -> Vec<Tree> {
+        self.children.iter().map(Tree::new).collect()
+    }
+
+    fn diff(&self, tree: &mut Tree) {
+        tree.diff_children(&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);
+
+        layout::flex::resolve(
+            layout::flex::Axis::Horizontal,
+            renderer,
+            &limits,
+            self.padding,
+            self.spacing,
+            self.align_items,
+            &self.children,
+        )
+    }
+
+    fn operate(
+        &self,
+        tree: &mut Tree,
+        layout: Layout<'_>,
+        renderer: &Renderer,
+        operation: &mut dyn Operation<Message>,
+    ) {
+        operation.container(None, &mut |operation| {
+            self.children
+                .iter()
+                .zip(&mut tree.children)
+                .zip(layout.children())
+                .for_each(|((child, state), layout)| {
+                    child
+                        .as_widget()
+                        .operate(state, layout, renderer, operation);
+                })
+        });
+    }
+
+    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,
+        theme: &Renderer::Theme,
+        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,
+                theme,
+                style,
+                layout,
+                cursor_position,
+                viewport,
+            );
+        }
+    }
+
+    fn overlay<'b>(
+        &'b mut self,
+        tree: &'b mut Tree,
+        layout: Layout<'_>,
+        renderer: &Renderer,
+    ) -> Option<overlay::Element<'b, Message, Renderer>> {
+        overlay::from_children(&mut self.children, tree, layout, renderer)
+    }
+}
+
+impl<'a, Message, Renderer> From<Row<'a, Message, Renderer>>
+    for Element<'a, Message, Renderer>
+where
+    Message: 'a,
+    Renderer: crate::core::Renderer + 'a,
+{
+    fn from(row: Row<'a, Message, Renderer>) -> Self {
+        Self::new(row)
+    }
+}