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use crate::{
align::Align,
event::{Callback, Event, EventResult, Key, MouseButton, MouseEvent},
menu,
rect::Rect,
theme::ColorStyle,
view::scroll,
view::{Position, View},
views::OnEventView,
Cursive, Printer, Vec2, With,
};
use std::cmp::min;
use std::rc::Rc;
use unicode_width::UnicodeWidthStr;
pub struct MenuPopup {
menu: Rc<menu::Tree>,
focus: usize,
scroll_core: scroll::Core,
align: Align,
on_dismiss: Option<Callback>,
on_action: Option<Callback>,
}
impl_scroller!(MenuPopup::scroll_core);
impl MenuPopup {
pub fn new(menu: Rc<menu::Tree>) -> Self {
MenuPopup {
menu,
focus: 0,
scroll_core: scroll::Core::new(),
align: Align::top_left(),
on_dismiss: None,
on_action: None,
}
}
pub fn set_focus(&mut self, focus: usize) {
self.focus = min(focus, self.menu.len());
}
#[must_use]
pub fn focus(self, focus: usize) -> Self {
self.with(|s| s.set_focus(focus))
}
pub fn get_focus(&self) -> usize {
self.focus
}
fn item_width(item: &menu::Item) -> usize {
match *item {
menu::Item::Delimiter => 1,
menu::Item::Leaf { ref label, .. } => label.width(),
menu::Item::Subtree { ref label, .. } => label.width() + 3,
}
}
#[must_use]
pub fn align(self, align: Align) -> Self {
self.with(|s| s.set_align(align))
}
pub fn set_align(&mut self, align: Align) {
self.align = align;
}
#[must_use]
pub fn on_dismiss<F: 'static + Fn(&mut Cursive)>(self, f: F) -> Self {
self.with(|s| s.set_on_dismiss(f))
}
pub fn set_on_dismiss<F: 'static + Fn(&mut Cursive)>(&mut self, f: F) {
self.on_dismiss = Some(Callback::from_fn(f));
}
#[must_use]
pub fn on_action<F: 'static + Fn(&mut Cursive)>(self, f: F) -> Self {
self.with(|s| s.set_on_action(f))
}
pub fn set_on_action<F: 'static + Fn(&mut Cursive)>(&mut self, f: F) {
self.on_action = Some(Callback::from_fn(f));
}
fn scroll_up(&mut self, mut n: usize, cycle: bool) {
while n > 0 {
if self.focus > 0 {
self.focus -= 1;
} else if cycle {
self.focus = self.menu.children.len() - 1;
} else {
break;
}
if self.menu.children[self.focus].is_enabled() {
n -= 1;
}
}
}
fn scroll_down(&mut self, mut n: usize, cycle: bool) {
while n > 0 {
if self.focus + 1 < self.menu.children.len() {
self.focus += 1;
} else if cycle {
self.focus = 0;
} else {
break;
}
if self.menu.children[self.focus].is_enabled() {
n -= 1;
}
}
}
fn submit(&mut self) -> EventResult {
match self.menu.children[self.focus] {
menu::Item::Leaf { ref cb, .. } => {
let cb = cb.clone();
let action_cb = self.on_action.clone();
EventResult::with_cb(move |s| {
s.pop_layer();
if let Some(ref action_cb) = action_cb {
action_cb.clone()(s);
}
cb.clone()(s);
})
}
menu::Item::Subtree { ref tree, .. } => self.make_subtree_cb(tree),
_ => unreachable!("Delimiters cannot be submitted."),
}
}
fn dismiss(&mut self) -> EventResult {
let dismiss_cb = self.on_dismiss.clone();
EventResult::with_cb(move |s| {
if let Some(ref cb) = dismiss_cb {
cb.clone()(s);
}
s.pop_layer();
})
}
fn make_subtree_cb(&self, tree: &Rc<menu::Tree>) -> EventResult {
let tree = Rc::clone(tree);
let max_width = 4 + self
.menu
.children
.iter()
.map(MenuPopup::item_width)
.max()
.unwrap_or(1);
let offset = Vec2::new(max_width, self.focus);
let action_cb = self.on_action.clone();
EventResult::with_cb(move |s| {
let action_cb = action_cb.clone();
s.screen_mut().add_layer_at(
Position::parent(offset),
OnEventView::new(MenuPopup::new(Rc::clone(&tree)).on_action(
move |s| {
s.pop_layer();
if let Some(ref action_cb) = action_cb {
action_cb.clone()(s);
}
},
))
.on_event(Key::Left, |s| {
s.pop_layer();
}),
);
})
}
fn inner_on_event(&mut self, event: Event) -> EventResult {
match event {
Event::Key(Key::Up) => self.scroll_up(1, true),
Event::Key(Key::PageUp) => self.scroll_up(5, false),
Event::Key(Key::Down) => self.scroll_down(1, true),
Event::Key(Key::PageDown) => self.scroll_down(5, false),
Event::Key(Key::Home) => self.focus = 0,
Event::Key(Key::End) => {
self.focus = self.menu.children.len().saturating_sub(1)
}
Event::Key(Key::Right)
if self.menu.children[self.focus].is_subtree() =>
{
return match self.menu.children[self.focus] {
menu::Item::Subtree { ref tree, .. } => {
self.make_subtree_cb(tree)
}
_ => unreachable!("Child is a subtree"),
};
}
Event::Key(Key::Enter)
if self.menu.children[self.focus].is_enabled() =>
{
return self.submit();
}
Event::Mouse {
event: MouseEvent::Press(_),
position,
offset,
} => {
if let Some(position) = position.checked_sub(offset) {
let focus = position.y;
if focus < self.menu.len()
&& self.menu.children[focus].is_enabled()
{
self.focus = focus;
}
}
}
Event::Mouse {
event: MouseEvent::Release(MouseButton::Left),
position,
offset,
} if self.menu.children[self.focus].is_enabled()
&& position
.checked_sub(offset)
.map(|position| position.y == self.focus)
.unwrap_or(false) =>
{
return self.submit();
}
Event::Key(Key::Esc) => {
return self.dismiss();
}
_ => return EventResult::Ignored,
}
EventResult::Consumed(None)
}
fn inner_required_size(&mut self, _req: Vec2) -> Vec2 {
let w = 2 + self
.menu
.children
.iter()
.map(Self::item_width)
.max()
.unwrap_or(1);
let h = self.menu.children.len();
Vec2::new(w, h)
}
fn inner_important_area(&self, size: Vec2) -> Rect {
if self.menu.is_empty() {
return Rect::from_size(Vec2::zero(), size);
}
Rect::from_size((0, self.focus), (size.x, 1))
}
}
impl View for MenuPopup {
fn draw(&self, printer: &Printer) {
if !printer.size.fits((2, 2)) {
return;
}
let h = self.menu.len();
let offset = self.align.v.get_offset(h, printer.size.y);
let printer = &printer.offset((0, offset));
scroll::draw_box_frame(
self,
printer,
|s, y| s.menu.children[y].is_delimiter(),
|_s, _x| false,
);
let printer = printer.shrinked_centered((2, 2));
scroll::draw_lines(self, &printer, |s, printer, i| {
let item = &s.menu.children[i];
let enabled =
printer.enabled && (item.is_enabled() || item.is_delimiter());
let color = if !enabled {
ColorStyle::secondary()
} else if i == s.focus {
ColorStyle::highlight()
} else {
ColorStyle::primary()
};
printer.with_style(color, |printer| {
match *item {
menu::Item::Delimiter => {
printer.print_hline((0, 0), printer.size.x, "─");
}
menu::Item::Subtree { ref label, .. } => {
if printer.size.x < 4 {
return;
}
printer.print_hline((0, 0), printer.size.x, " ");
printer.print((1, 0), label);
let x = printer.size.x.saturating_sub(3);
printer.print((x, 0), ">>");
}
menu::Item::Leaf { ref label, .. } => {
if printer.size.x < 2 {
return;
}
printer.print_hline((0, 0), printer.size.x, " ");
printer.print((1, 0), label);
}
}
});
});
}
fn required_size(&mut self, req: Vec2) -> Vec2 {
scroll::required_size(
self,
req.saturating_sub((2, 2)),
true,
Self::inner_required_size,
) + (2, 2)
}
fn on_event(&mut self, event: Event) -> EventResult {
match scroll::on_event(
self,
event.relativized((1, 1)),
Self::inner_on_event,
Self::inner_important_area,
) {
EventResult::Ignored => {
if let Event::Mouse {
event: MouseEvent::Press(_),
position,
offset,
} = event
{
if !position.fits_in_rect(
offset,
self.scroll_core.last_outer_size() + (2, 2),
) {
let dismiss_cb = self.on_dismiss.clone();
return EventResult::with_cb(move |s| {
if let Some(ref cb) = dismiss_cb {
cb.clone()(s);
}
s.pop_layer();
});
}
}
EventResult::Ignored
}
other => other,
}
}
fn layout(&mut self, size: Vec2) {
scroll::layout(
self,
size.saturating_sub((2, 2)),
true,
|_s, _size| (),
Self::inner_required_size,
);
}
fn important_area(&self, size: Vec2) -> Rect {
scroll::important_area(
self,
size.saturating_sub((2, 2)),
Self::inner_important_area,
)
.with(|area| area.offset((1, 1)))
}
}