use termion::event::{Event};
use crate::widget::{Widget, WidgetCore};
use crate::coordinates::{Coordinates, Size, Position};
use crate::fail::{HResult, HError, ErrorLog};
#[derive(PartialEq)]
pub struct VBox<T: Widget> {
pub core: WidgetCore,
pub widgets: Vec<T>,
pub widget_sizes: Option<Vec<usize>>,
pub zoom_active: bool,
pub active: Option<usize>,
}
impl<T> VBox<T> where T: Widget + PartialEq {
pub fn new(core: &WidgetCore) -> VBox<T> {
VBox { core: core.clone(),
widgets: vec![],
widget_sizes: None,
zoom_active: false,
active: None
}
}
pub fn resize_children(&mut self) -> HResult<()> {
let len = self.widgets.len();
if len == 0 { return Ok(()) }
if self.zoom_active {
let coords = self.core.coordinates.clone();
self.active_widget_mut()?.set_coordinates(&coords).log();
return Ok(());
}
let coords: Vec<Coordinates> = self.calculate_coordinates()?;
for (widget, coord) in self.widgets.iter_mut().zip(coords.iter()) {
widget.set_coordinates(coord).log();
}
Ok(())
}
pub fn push_widget(&mut self, widget: T) {
self.widgets.push(widget);
}
pub fn pop_widget(&mut self) -> Option<T> {
let widget = self.widgets.pop();
widget
}
pub fn remove_widget(&mut self, index: usize) -> T {
self.widgets.remove(index)
}
pub fn prepend_widget(&mut self, widget: T) {
self.widgets.insert(0, widget);
}
pub fn insert_widget(&mut self, index: usize, widget: T) {
self.widgets.insert(index, widget);
}
pub fn replace_widget(&mut self, index: usize, mut widget: T) -> T {
std::mem::swap(&mut self.widgets[index], &mut widget);
widget
}
pub fn toggle_zoom(&mut self) -> HResult<()> {
self.clear().log();
self.zoom_active = !self.zoom_active;
self.resize_children()
}
pub fn set_widget_sizes(&mut self, widget_sizes: Vec<usize>) {
self.widget_sizes = Some(widget_sizes);
}
pub fn calculate_equal_widget_sizes(&self) -> HResult<Vec<usize>> {
let len = self.widgets.len();
if len == 0 { return HError::no_widget(); }
let widget_sizes = (0..len).map(|_| 100 / len).collect();
Ok(widget_sizes)
}
pub fn calculate_coordinates(&self)
-> HResult<Vec<Coordinates>> {
let box_coords = self.get_coordinates()?;
let box_xpos = box_coords.xpos();
let box_xsize = box_coords.xsize();
let box_ysize = box_coords.ysize();
let box_top = box_coords.top().y();
let widget_sizes = match &self.widget_sizes {
Some(widget_sizes) => widget_sizes.clone(),
None => self.calculate_equal_widget_sizes()?
};
let coords = widget_sizes
.iter()
.fold(Vec::<Coordinates>::new(),
|mut coords, widget_size| {
let prev_ypos = coords
.last()
.map_or(box_top,
|prev_coords| prev_coords.ypos()
+ prev_coords.ysize());
let widget_coords = Coordinates::new_at(box_xsize,
*widget_size as u16,
box_xpos,
prev_ypos);
coords.push(widget_coords);
coords
});
Ok(coords)
}
pub fn set_active(&mut self, i: usize) -> HResult<()> {
if i+1 > self.widgets.len() {
HError::no_widget()?
}
self.active = Some(i);
Ok(())
}
pub fn active_widget(&self) -> Option<&T> {
self.widgets.get(self.active?)
}
pub fn active_widget_mut(&mut self) -> Option<&mut T> {
self.widgets.get_mut(self.active?)
}
}
impl<T> Widget for VBox<T> where T: Widget + PartialEq {
fn get_core(&self) -> HResult<&WidgetCore> {
Ok(&self.core)
}
fn get_core_mut(&mut self) -> HResult<&mut WidgetCore> {
Ok(&mut self.core)
}
fn set_coordinates(&mut self, coordinates: &Coordinates) -> HResult<()> {
self.core.coordinates = coordinates.clone();
self.resize_children()
}
fn render_header(&self) -> HResult<String> {
self.active_widget()?.render_header()
}
fn refresh(&mut self) -> HResult<()> {
if self.zoom_active {
self.active_widget_mut()?.refresh().log();
return Ok(());
}
self.resize_children().log();
for child in &mut self.widgets {
child.refresh().log();
}
Ok(())
}
fn get_drawlist(&self) -> HResult<String> {
if self.zoom_active {
return self.active_widget()?.get_drawlist();
}
Ok(self.widgets.iter().map(|child| {
child.get_drawlist().log_and().unwrap_or_else(|_| String::new())
}).collect())
}
fn on_event(&mut self, event: Event) -> HResult<()> {
self.active_widget_mut()?.on_event(event)?;
Ok(())
}
}