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use Printer;
use direction::Direction;
use event::{Event, EventResult};
use std::any::Any;
use theme::ColorStyle;
use vec::Vec2;
use view::{Offset, Position, Selector, View};
use views::ShadowView;
pub struct StackView {
layers: Vec<Layer>,
last_size: Vec2,
}
struct Layer {
view: Box<View>,
size: Vec2,
position: Position,
virgin: bool,
}
new_default!(StackView);
impl StackView {
pub fn new() -> Self {
StackView {
layers: Vec::new(),
last_size: Vec2::zero(),
}
}
pub fn add_layer<T: 'static + View>(&mut self, view: T) {
self.add_layer_at(Position::center(), view);
}
pub fn add_layer_at<T: 'static + View>(&mut self, position: Position,
view: T) {
self.layers.push(Layer {
view: Box::new(ShadowView::new(view)
.top_padding(position.y == Offset::Center)
.left_padding(position.x == Offset::Center)),
size: Vec2::new(0, 0),
position: position,
virgin: true,
});
}
pub fn pop_layer(&mut self) {
self.layers.pop();
}
pub fn offset(&self) -> Vec2 {
let mut previous = Vec2::zero();
for layer in &self.layers {
let offset = layer.position
.compute_offset(layer.size, self.last_size, previous);
previous = offset;
}
previous
}
pub fn layer_sizes(&self) -> Vec<Vec2> {
self.layers.iter().map(|layer| layer.size).collect()
}
}
impl View for StackView {
fn draw(&self, printer: &Printer) {
let last = self.layers.len();
let mut previous = Vec2::zero();
printer.with_color(ColorStyle::Primary, |printer| {
for (i, v) in self.layers.iter().enumerate() {
let offset = v.position
.compute_offset(v.size, printer.size, previous);
previous = offset;
v.view
.draw(&printer.sub_printer(offset, v.size, i + 1 == last));
}
});
}
fn on_event(&mut self, event: Event) -> EventResult {
match self.layers.last_mut() {
None => EventResult::Ignored,
Some(v) => v.view.on_event(event),
}
}
fn layout(&mut self, size: Vec2) {
self.last_size = size;
for layer in &mut self.layers {
let size = Vec2::min(size, layer.view.get_min_size(size));
layer.size = size;
layer.view.layout(layer.size);
if layer.virgin {
layer.view.take_focus(Direction::none());
layer.virgin = false;
}
}
}
fn get_min_size(&mut self, size: Vec2) -> Vec2 {
self.layers
.iter_mut()
.map(|layer| layer.view.get_min_size(size))
.fold(Vec2::new(1, 1), Vec2::max)
}
fn take_focus(&mut self, source: Direction) -> bool {
match self.layers.last_mut() {
None => false,
Some(mut v) => v.view.take_focus(source),
}
}
fn find_any(&mut self, selector: &Selector) -> Option<&mut Any> {
self.layers
.iter_mut()
.filter_map(|l| l.view.find_any(selector))
.next()
}
}