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|
use crate::{
column, input::mouse, Element, Event, Hasher, Layout, Node, Point,
Rectangle, Style, Widget,
};
pub use iced_core::scrollable::State;
use std::hash::Hash;
/// A scrollable [`Column`].
///
/// [`Column`]: ../column/struct.Column.html
pub type Scrollable<'a, Message, Renderer> =
iced_core::Scrollable<'a, Element<'a, Message, Renderer>>;
impl<'a, Message, Renderer> Widget<Message, Renderer>
for Scrollable<'a, Message, Renderer>
where
Renderer: self::Renderer + column::Renderer,
{
fn node(&self, renderer: &Renderer) -> Node {
let mut content = self.content.node(renderer);
{
let mut style = content.0.style();
style.flex_shrink = 0.0;
content.0.set_style(style);
}
let mut style = Style::default()
.width(self.content.width)
.max_width(self.content.max_width)
.height(self.height)
.max_height(self.max_height)
.align_self(self.align_self);
style.0.flex_direction = stretch::style::FlexDirection::Column;
Node::with_children(style, vec![content])
}
fn on_event(
&mut self,
event: Event,
layout: Layout<'_>,
cursor_position: Point,
messages: &mut Vec<Message>,
renderer: &Renderer,
) {
let bounds = layout.bounds();
let is_mouse_over = bounds.contains(cursor_position);
let content = layout.children().next().unwrap();
let content_bounds = content.bounds();
if is_mouse_over {
match event {
Event::Mouse(mouse::Event::WheelScrolled {
delta_y, ..
}) => {
self.state.scroll(delta_y, bounds, content_bounds);
}
_ => {}
}
}
let cursor_position = if is_mouse_over {
Point::new(
cursor_position.x,
cursor_position.y
+ self.state.offset(bounds, content_bounds) as f32,
)
} else {
// TODO: Make `cursor_position` an `Option<Point>` so we can encode
// cursor unavailability.
// This will probably happen naturally once we add multi-window
// support.
Point::new(cursor_position.x, -1.0)
};
self.content.on_event(
event,
content,
cursor_position,
messages,
renderer,
)
}
fn draw(
&self,
renderer: &mut Renderer,
layout: Layout<'_>,
cursor_position: Point,
) -> Renderer::Output {
let bounds = layout.bounds();
let content_layout = layout.children().next().unwrap();
self::Renderer::draw(
renderer,
&self,
bounds,
content_layout,
cursor_position,
)
}
fn hash_layout(&self, state: &mut Hasher) {
std::any::TypeId::of::<Scrollable<'static, (), ()>>().hash(state);
self.height.hash(state);
self.max_height.hash(state);
self.align_self.hash(state);
self.content.hash_layout(state)
}
}
pub trait Renderer: crate::Renderer + Sized {
fn draw<Message>(
&mut self,
scrollable: &Scrollable<'_, Message, Self>,
bounds: Rectangle,
content_layout: Layout<'_>,
cursor_position: Point,
) -> Self::Output;
}
impl<'a, Message, Renderer> From<Scrollable<'a, Message, Renderer>>
for Element<'a, Message, Renderer>
where
Renderer: 'a + self::Renderer + column::Renderer,
Message: 'static,
{
fn from(
scrollable: Scrollable<'a, Message, Renderer>,
) -> Element<'a, Message, Renderer> {
Element::new(scrollable)
}
}
|
