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use crate::{
layout, Clipboard, Element, Event, Hasher, Layout, Length, Point, Size,
Widget,
};
use std::collections::HashMap;
#[allow(missing_debug_implementations)]
pub struct Panes<'a, Message, Renderer> {
state: &'a mut Internal,
elements: Vec<Element<'a, Message, Renderer>>,
width: Length,
height: Length,
}
impl<'a, Message, Renderer> Panes<'a, Message, Renderer> {
pub fn new<T>(
state: &'a mut State<T>,
view: impl Fn(Pane, &'a mut T) -> Element<'a, Message, Renderer>,
) -> Self {
let elements = state
.panes
.iter_mut()
.map(|(pane, state)| view(*pane, state))
.collect();
Self {
state: &mut state.internal,
elements,
width: Length::Fill,
height: Length::Fill,
}
}
/// Sets the width of the [`Panes`].
///
/// [`Panes`]: struct.Column.html
pub fn width(mut self, width: Length) -> Self {
self.width = width;
self
}
/// Sets the height of the [`Panes`].
///
/// [`Panes`]: struct.Column.html
pub fn height(mut self, height: Length) -> Self {
self.height = height;
self
}
}
impl<'a, Message, Renderer> Widget<Message, Renderer>
for Panes<'a, Message, Renderer>
where
Renderer: self::Renderer + 'static,
Message: 'static,
{
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);
let size = limits.resolve(Size::ZERO);
let children = self
.elements
.iter()
.map(|element| element.layout(renderer, &limits))
.collect();
layout::Node::with_children(size, children)
}
fn draw(
&self,
renderer: &mut Renderer,
defaults: &Renderer::Defaults,
layout: Layout<'_>,
cursor_position: Point,
) -> Renderer::Output {
renderer.draw(defaults, &self.elements, layout, cursor_position)
}
fn hash_layout(&self, state: &mut Hasher) {
use std::hash::Hash;
std::any::TypeId::of::<Panes<'_, Message, Renderer>>().hash(state);
self.width.hash(state);
self.height.hash(state);
self.state.layout.hash(state);
for element in &self.elements {
element.hash_layout(state);
}
}
}
#[derive(Debug, Clone, Copy, PartialEq, Eq, Hash)]
pub struct Pane(usize);
#[derive(Debug)]
pub struct State<T> {
panes: HashMap<Pane, T>,
internal: Internal,
}
#[derive(Debug)]
struct Internal {
layout: Node,
last_pane: usize,
focused_pane: Option<Pane>,
}
impl<T> State<T> {
pub fn new(first_pane_state: T) -> (Self, Pane) {
let first_pane = Pane(0);
let mut panes = HashMap::new();
let _ = panes.insert(first_pane, first_pane_state);
(
State {
panes,
internal: Internal {
layout: Node::Pane(first_pane),
last_pane: 0,
focused_pane: None,
},
},
first_pane,
)
}
pub fn get_mut(&mut self, pane: &Pane) -> Option<&mut T> {
self.panes.get_mut(pane)
}
pub fn iter(&self) -> impl Iterator<Item = (Pane, &T)> {
self.panes.iter().map(|(pane, state)| (*pane, state))
}
pub fn iter_mut(&mut self) -> impl Iterator<Item = (Pane, &mut T)> {
self.panes.iter_mut().map(|(pane, state)| (*pane, state))
}
pub fn focused_pane(&self) -> Option<Pane> {
self.internal.focused_pane
}
pub fn focus(&mut self, pane: Pane) {
self.internal.focused_pane = Some(pane);
}
pub fn split_vertically(&mut self, pane: &Pane, state: T) -> Option<Pane> {
let new_pane = Pane(self.internal.last_pane.checked_add(1)?);
// TODO
Some(new_pane)
}
pub fn split_horizontally(
&mut self,
pane: &Pane,
state: T,
) -> Option<Pane> {
let new_pane = Pane(self.internal.last_pane.checked_add(1)?);
// TODO
Some(new_pane)
}
}
#[derive(Debug, Clone, Hash)]
enum Node {
Split {
kind: Split,
ratio: u32,
a: Box<Node>,
b: Box<Node>,
},
Pane(Pane),
}
#[derive(Debug, Clone, Copy, Hash)]
enum Split {
Horizontal,
Vertical,
}
/// The renderer of some [`Panes`].
///
/// Your [renderer] will need to implement this trait before being
/// able to use [`Panes`] in your user interface.
///
/// [`Panes`]: struct.Panes.html
/// [renderer]: ../../renderer/index.html
pub trait Renderer: crate::Renderer + Sized {
/// Draws some [`Panes`].
///
/// It receives:
/// - the children of the [`Column`]
/// - the [`Layout`] of the [`Column`] and its children
/// - the cursor position
///
/// [`Column`]: struct.Row.html
/// [`Layout`]: ../layout/struct.Layout.html
fn draw<Message>(
&mut self,
defaults: &Self::Defaults,
content: &[Element<'_, Message, Self>],
layout: Layout<'_>,
cursor_position: Point,
) -> Self::Output;
}
impl<'a, Message, Renderer> From<Panes<'a, Message, Renderer>>
for Element<'a, Message, Renderer>
where
Renderer: self::Renderer + 'static,
Message: 'static,
{
fn from(
panes: Panes<'a, Message, Renderer>,
) -> Element<'a, Message, Renderer> {
Element::new(panes)
}
}
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