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|
//! Decorate content and apply alignment.
use std::hash::Hash;
use crate::{
layout, Align, Element, Event, Hasher, Layout, Length, Point, Widget,
};
use std::u32;
/// An element decorating some content.
///
/// It is normally used for alignment purposes.
#[allow(missing_docs)]
pub struct Container<'a, Message, Renderer> {
width: Length,
height: Length,
max_width: u32,
max_height: u32,
horizontal_alignment: Align,
vertical_alignment: Align,
content: Element<'a, Message, Renderer>,
}
impl<'a, Message, Renderer> Container<'a, Message, Renderer> {
/// Creates an empty [`Container`].
///
/// [`Container`]: struct.Container.html
pub fn new<T>(content: T) -> Self
where
T: Into<Element<'a, Message, Renderer>>,
{
Container {
width: Length::Shrink,
height: Length::Shrink,
max_width: u32::MAX,
max_height: u32::MAX,
horizontal_alignment: Align::Start,
vertical_alignment: Align::Start,
content: content.into(),
}
}
/// Sets the width of the [`Container`].
///
/// [`Container`]: struct.Container.html
pub fn width(mut self, width: Length) -> Self {
self.width = width;
self
}
/// Sets the height of the [`Container`].
///
/// [`Container`]: struct.Container.html
pub fn height(mut self, height: Length) -> Self {
self.height = height;
self
}
/// Sets the maximum width of the [`Container`].
///
/// [`Container`]: struct.Container.html
pub fn max_width(mut self, max_width: u32) -> Self {
self.max_width = max_width;
self
}
/// Sets the maximum height of the [`Container`] in pixels.
///
/// [`Container`]: struct.Container.html
pub fn max_height(mut self, max_height: u32) -> Self {
self.max_height = max_height;
self
}
/// Centers the contents in the horizontal axis of the [`Container`].
///
/// [`Container`]: struct.Container.html
pub fn center_x(mut self) -> Self {
self.horizontal_alignment = Align::Center;
self
}
/// Centers the contents in the vertical axis of the [`Container`].
///
/// [`Container`]: struct.Container.html
pub fn center_y(mut self) -> Self {
self.vertical_alignment = Align::Center;
self
}
}
impl<'a, Message, Renderer> Widget<Message, Renderer>
for Container<'a, Message, Renderer>
where
Renderer: crate::Renderer,
{
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
.loose()
.max_width(self.max_width)
.max_height(self.max_height)
.width(self.width)
.height(self.height);
let mut content = self.content.layout(renderer, &limits.loose());
let size = limits.resolve(content.size());
content.align(self.horizontal_alignment, self.vertical_alignment, size);
layout::Node::with_children(size, vec![content])
}
fn on_event(
&mut self,
event: Event,
layout: Layout<'_>,
cursor_position: Point,
messages: &mut Vec<Message>,
renderer: &Renderer,
) {
self.content.widget.on_event(
event,
layout.children().next().unwrap(),
cursor_position,
messages,
renderer,
)
}
fn draw(
&self,
renderer: &mut Renderer,
layout: Layout<'_>,
cursor_position: Point,
) -> Renderer::Output {
self.content.draw(
renderer,
layout.children().next().unwrap(),
cursor_position,
)
}
fn hash_layout(&self, state: &mut Hasher) {
0.hash(state);
self.width.hash(state);
self.height.hash(state);
self.max_width.hash(state);
self.max_height.hash(state);
self.content.hash_layout(state);
}
}
impl<'a, Message, Renderer> From<Container<'a, Message, Renderer>>
for Element<'a, Message, Renderer>
where
Renderer: 'a + crate::Renderer,
Message: 'static,
{
fn from(
column: Container<'a, Message, Renderer>,
) -> Element<'a, Message, Renderer> {
Element::new(column)
}
}
|
