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|
use tui::{backend::Backend, layout::Rect, Frame};
pub mod flex_element;
pub use flex_element::FlexElement;
use crate::tuice::{Bounds, Component, DrawContext, Element, Event, LayoutNode, Size, Status};
#[derive(Clone, Copy, Debug)]
pub enum Axis {
/// Represents the x-axis.
Horizontal,
/// Represents the y-axis.
Vertical,
}
pub struct Flex<'a, Message, B: Backend> {
children: Vec<FlexElement<'a, Message, B>>,
alignment: Axis,
}
impl<'a, Message, B: Backend> Flex<'a, Message, B> {
pub fn new(alignment: Axis) -> Self {
Self {
children: vec![],
alignment,
}
}
/// Creates a new [`Flex`] with a horizontal alignment.
pub fn row() -> Self {
Self {
children: vec![],
alignment: Axis::Horizontal,
}
}
/// Creates a new [`Flex`] with a horizontal alignment with the given children.
pub fn row_with_children<C>(children: Vec<C>) -> Self
where
C: Into<FlexElement<'a, Message, B>>,
{
Self {
children: children.into_iter().map(Into::into).collect(),
alignment: Axis::Horizontal,
}
}
/// Creates a new [`Flex`] with a vertical alignment.
pub fn column() -> Self {
Self {
children: vec![],
alignment: Axis::Vertical,
}
}
/// Creates a new [`Flex`] with a vertical alignment with the given children.
pub fn column_with_children<C>(children: Vec<C>) -> Self
where
C: Into<FlexElement<'a, Message, B>>,
{
Self {
children: children.into_iter().map(Into::into).collect(),
alignment: Axis::Vertical,
}
}
pub fn with_child<E>(mut self, child: E) -> Self
where
E: Into<Element<'a, Message, B>>,
{
self.children.push(FlexElement::with_no_flex(child.into()));
self
}
pub fn with_flex_child<E>(mut self, child: E, flex: u16) -> Self
where
E: Into<Element<'a, Message, B>>,
{
self.children
.push(FlexElement::with_flex(child.into(), flex));
self
}
}
impl<'a, Message, B: Backend> Component<Message, B> for Flex<'a, Message, B> {
fn draw(&mut self, context: DrawContext<'_>, frame: &mut Frame<'_, B>) {
self.children
.iter_mut()
.zip(context.children())
.for_each(|(child, child_node)| {
if child_node.should_draw() {
child.draw(child_node, frame);
}
});
}
fn on_event(&mut self, area: Rect, event: Event, messages: &mut Vec<Message>) -> Status {
// for child in self.children.iter_mut() {
// if let Status::Captured = child.on_event() {
// return Status::Captured;
// }
// }
Status::Ignored
}
fn layout(&self, bounds: Bounds, node: &mut LayoutNode) -> Size {
let mut remaining_bounds = bounds;
let mut children = vec![LayoutNode::default(); self.children.len()];
let mut flexible_children_indexes = vec![];
let mut current_x_offset = 0;
let mut current_y_offset = 0;
let mut sizes = Vec::with_capacity(self.children.len());
let mut current_size = Size::default();
let mut total_flex = 0;
// Our general approach is to first handle inflexible children first,
// then distribute all remaining space to flexible children.
self.children
.iter()
.zip(children.iter_mut())
.enumerate()
.for_each(|(index, (child, child_node))| {
if child.flex == 0 {
let size = if remaining_bounds.has_space() {
let size = child.child_layout(remaining_bounds, child_node);
current_size += size;
remaining_bounds.shrink_size(size);
size
} else {
Size::default()
};
sizes.push(size);
} else {
total_flex += child.flex;
flexible_children_indexes.push(index);
sizes.push(Size::default());
}
});
flexible_children_indexes.into_iter().for_each(|index| {
// The index accesses are assumed to be safe by above definitions.
// This means that we can use the unsafe operations below.
//
// NB: If you **EVER** make changes in this function, ensure these assumptions
// still hold!
let child = unsafe { self.children.get_unchecked(index) };
let child_node = unsafe { children.get_unchecked_mut(index) };
let size = unsafe { sizes.get_unchecked_mut(index) };
let new_size =
child.ratio_layout(remaining_bounds, total_flex, child_node, self.alignment);
current_size += new_size;
*size = new_size;
});
// If there is still remaining space after, distribute the rest if
// appropriate (e.x. current_size is too small for the bounds).
if current_size.width < bounds.min_width {
// For now, we'll cheat and just set it to be equal.
current_size.width = bounds.min_width;
}
if current_size.height < bounds.min_height {
// For now, we'll cheat and just set it to be equal.
current_size.height = bounds.min_height;
}
// Now that we're done determining sizes, convert all children into the appropriate
// layout nodes. Remember - parents determine children, and so, we determine
// children here!
sizes
.iter()
.zip(children.iter_mut())
.for_each(|(size, child)| {
child.rect = Rect::new(current_x_offset, current_y_offset, size.width, size.height);
match self.alignment {
Axis::Horizontal => {
current_x_offset += size.width;
}
Axis::Vertical => {
current_y_offset += size.height;
}
}
});
node.children = children;
current_size
}
}
impl<'a, Message, B: Backend> From<Flex<'a, Message, B>> for Element<'a, Message, B>
where
Message: 'a,
B: 'a,
{
fn from(flex: Flex<'a, Message, B>) -> Self {
Element::new(flex)
}
}
|
