use iced_renderer::core::widget::OperationOutputWrapper;
use crate::core::event::{self, Event};
use crate::core::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, Layout, Length, Padding, Pixels, Rectangle,
Shell, Size, Widget,
};
#[allow(missing_debug_implementations)]
pub struct Column<'a, Message, Theme = crate::Theme, Renderer = crate::Renderer>
{
spacing: f32,
padding: Padding,
width: Length,
height: Length,
max_width: f32,
align_items: Alignment,
children: Vec<Element<'a, Message, Theme, Renderer>>,
}
impl<'a, Message, Theme, Renderer> Column<'a, Message, Theme, Renderer>
where
Renderer: crate::core::Renderer,
{
pub fn new() -> Self {
Column {
spacing: 0.0,
padding: Padding::ZERO,
width: Length::Shrink,
height: Length::Shrink,
max_width: f32::INFINITY,
align_items: Alignment::Start,
children: Vec::new(),
}
}
pub fn with_children(
children: impl IntoIterator<Item = Element<'a, Message, Theme, Renderer>>,
) -> Self {
children.into_iter().fold(Self::new(), Self::push)
}
pub fn spacing(mut self, amount: impl Into<Pixels>) -> Self {
self.spacing = amount.into().0;
self
}
pub fn padding<P: Into<Padding>>(mut self, padding: P) -> Self {
self.padding = padding.into();
self
}
pub fn width(mut self, width: impl Into<Length>) -> Self {
self.width = width.into();
self
}
pub fn height(mut self, height: impl Into<Length>) -> Self {
self.height = height.into();
self
}
pub fn max_width(mut self, max_width: impl Into<Pixels>) -> Self {
self.max_width = max_width.into().0;
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, Theme, Renderer>>,
) -> Self {
let child = child.into();
let size = child.as_widget().size_hint();
if size.width.is_fill() {
self.width = Length::Fill;
}
if size.height.is_fill() {
self.height = Length::Fill;
}
self.children.push(child);
self
}
}
impl<'a, Message, Renderer> Default for Column<'a, Message, Renderer>
where
Renderer: crate::core::Renderer,
{
fn default() -> Self {
Self::new()
}
}
impl<'a, Message, Theme, Renderer> Widget<Message, Theme, Renderer>
for Column<'a, Message, Theme, Renderer>
where
Renderer: crate::core::Renderer,
{
fn children(&self) -> Vec<Tree> {
self.children.iter().map(Tree::new).collect()
}
fn diff(&mut self, tree: &mut Tree) {
tree.diff_children(self.children.as_mut_slice());
}
fn size(&self) -> Size<Length> {
Size {
width: self.width,
height: self.height,
}
}
fn layout(
&self,
tree: &mut Tree,
renderer: &Renderer,
limits: &layout::Limits,
) -> layout::Node {
let limits = limits.max_width(self.max_width);
layout::flex::resolve(
layout::flex::Axis::Vertical,
renderer,
&limits,
self.width,
self.height,
self.padding,
self.spacing,
self.align_items,
&self.children,
&mut tree.children,
)
}
fn operate(
&self,
tree: &mut Tree,
layout: Layout<'_>,
renderer: &Renderer,
operation: &mut dyn Operation<OperationOutputWrapper<Message>>,
) {
operation.container(None, layout.bounds(), &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: mouse::Cursor,
renderer: &Renderer,
clipboard: &mut dyn Clipboard,
shell: &mut Shell<'_, Message>,
viewport: &Rectangle,
) -> 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,
renderer,
clipboard,
shell,
viewport,
)
})
.fold(event::Status::Ignored, event::Status::merge)
}
fn mouse_interaction(
&self,
tree: &Tree,
layout: Layout<'_>,
cursor: mouse::Cursor,
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, viewport, renderer,
)
})
.max()
.unwrap_or_default()
}
fn draw(
&self,
tree: &Tree,
renderer: &mut Renderer,
theme: &Theme,
style: &renderer::Style,
layout: Layout<'_>,
cursor: mouse::Cursor,
viewport: &Rectangle,
) {
if let Some(viewport) = layout.bounds().intersection(viewport) {
for ((child, state), layout) in self
.children
.iter()
.zip(&tree.children)
.zip(layout.children())
{
child.as_widget().draw(
state, renderer, theme, style, layout, cursor, &viewport,
);
}
}
}
fn overlay<'b>(
&'b mut self,
tree: &'b mut Tree,
layout: Layout<'_>,
renderer: &Renderer,
) -> Option<overlay::Element<'b, Message, Theme, Renderer>> {
overlay::from_children(&mut self.children, tree, layout, renderer)
}
#[cfg(feature = "a11y")]
fn a11y_nodes(
&self,
layout: Layout<'_>,
state: &Tree,
cursor: mouse::Cursor,
) -> iced_accessibility::A11yTree {
use iced_accessibility::A11yTree;
A11yTree::join(
self.children
.iter()
.zip(layout.children())
.zip(state.children.iter())
.map(|((c, c_layout), state)| {
c.as_widget().a11y_nodes(c_layout, state, cursor)
}),
)
}
fn drag_destinations(
&self,
state: &Tree,
layout: Layout<'_>,
renderer: &Renderer,
dnd_rectangles: &mut iced_style::core::clipboard::DndDestinationRectangles,
) {
for ((e, layout), state) in self
.children
.iter()
.zip(layout.children())
.zip(state.children.iter())
{
e.as_widget().drag_destinations(
state,
layout,
renderer,
dnd_rectangles,
);
}
}
}
impl<'a, Message, Theme, Renderer> From<Column<'a, Message, Theme, Renderer>>
for Element<'a, Message, Theme, Renderer>
where
Message: 'a,
Theme: 'a,
Renderer: crate::core::Renderer + 'a,
{
fn from(column: Column<'a, Message, Theme, Renderer>) -> Self {
Self::new(column)
}
}