use cursive::{
event::{Event, EventResult, Key, MouseButton, MouseEvent},
Rect, Vec2,
};
use std::cell::RefCell;
use std::time::{Duration, SystemTime};
const SCROLL_STRATEGY: ScrollStrategy = ScrollStrategy::KeepRow;
const SCROLL_WHEEL_DOWN: usize = 3;
const SCROLL_WHEEL_UP: usize = 3;
const SCROLL_PAGE_UP: usize = 10;
const SCROLL_PAGE_DOWN: usize = 10;
thread_local!(static LAST_TIME_G_WAS_PRESSED : RefCell<Option<SystemTime>> = RefCell::new(None));
pub use cursive::view::scroll::{draw, layout, required_size, Core, ScrollStrategy, Scroller};
use crate::config::CONFIG;
pub fn important_area<T, ImportantArea>(
scroller: &T,
size: Vec2,
mut important_area: ImportantArea,
) -> Rect
where
T: Scroller,
ImportantArea: FnMut(&T, Vec2) -> Rect,
{
let viewport = scroller.get_scroller().content_viewport();
let area = important_area(scroller, size);
let top_left = area.top_left().saturating_sub(viewport.top_left());
let bot_right = area
.bottom_right()
.saturating_sub(viewport.top_left())
.or_min(viewport.bottom_right());
Rect::from_corners(top_left, bot_right)
}
pub fn on_event<T, OnEvent, OnScroll, ImportantArea>(
scroller: &mut T,
event: Event,
mut on_event: OnEvent,
mut on_scroll: OnScroll,
mut important_area: ImportantArea,
) -> EventResult
where
T: Scroller,
OnEvent: FnMut(&mut T, Event) -> EventResult,
OnScroll: FnMut(&mut T),
ImportantArea: FnMut(&T, Vec2) -> Rect,
{
let mut relative_event = event.clone();
let inside = scroller
.get_scroller_mut()
.is_event_inside(&mut relative_event);
let result = if inside {
on_event(scroller, relative_event)
} else {
EventResult::Ignored
};
let half_viewport_height = scroller.get_scroller().content_viewport().height() / 2;
match result {
EventResult::Ignored => {
match event {
Event::Key(Key::Home) if scroller.get_scroller().is_enabled().any() => {
scroller.get_scroller_mut().scroll_to_left();
scroller.get_scroller_mut().scroll_to_top();
}
Event::Key(Key::End) if scroller.get_scroller().is_enabled().any() => {
scroller.get_scroller_mut().scroll_to_right();
scroller.get_scroller_mut().scroll_to_bottom();
}
Event::Key(Key::PageUp) if scroller.get_scroller().can_scroll_up() => {
scroller.get_scroller_mut().scroll_up(SCROLL_PAGE_UP)
}
Event::Key(Key::PageDown) if scroller.get_scroller().can_scroll_down() => {
scroller.get_scroller_mut().scroll_down(SCROLL_PAGE_DOWN)
}
Event::Char('G') => scroller.get_scroller_mut().scroll_to_bottom(),
Event::Char('g') => {
let now = SystemTime::now();
LAST_TIME_G_WAS_PRESSED.with(|last_time| {
if let Some(last_time) = *last_time.borrow() {
if let Ok(duration) = now.duration_since(last_time) {
if duration < Duration::from_millis(300) {
scroller.get_scroller_mut().scroll_to_top()
}
}
}
});
LAST_TIME_G_WAS_PRESSED.with(|last_time| *last_time.borrow_mut() = Some(now))
}
Event::CtrlChar('d') => {
if scroller.get_scroller().can_scroll_down() {
scroller
.get_scroller_mut()
.scroll_down(half_viewport_height)
}
}
Event::CtrlChar('u') => {
if scroller.get_scroller().can_scroll_up() {
scroller.get_scroller_mut().scroll_up(half_viewport_height)
}
}
key if key == CONFIG.keybindings.down
&& scroller.get_scroller().can_scroll_down() =>
{
scroller.get_scroller_mut().scroll_down(1)
}
key if key == CONFIG.keybindings.up && scroller.get_scroller().can_scroll_up() => {
scroller.get_scroller_mut().scroll_up(1)
}
key if key == CONFIG.keybindings.left
&& scroller.get_scroller().can_scroll_left() =>
{
scroller.get_scroller_mut().scroll_left(1);
}
key if key == CONFIG.keybindings.right
&& scroller.get_scroller().can_scroll_right() =>
{
scroller.get_scroller_mut().scroll_right(1);
}
Event::Mouse {
event: MouseEvent::WheelUp,
..
} if scroller.get_scroller().can_scroll_up() => {
scroller.get_scroller_mut().scroll_up(SCROLL_WHEEL_UP);
}
Event::Mouse {
event: MouseEvent::WheelDown,
..
} if scroller.get_scroller().can_scroll_down() => {
scroller.get_scroller_mut().scroll_down(SCROLL_WHEEL_DOWN);
}
Event::Mouse {
event: MouseEvent::Press(MouseButton::Left),
position,
offset,
} if scroller.get_scroller().get_show_scrollbars()
&& position
.checked_sub(offset)
.map(|position| scroller.get_scroller_mut().start_drag(position))
.unwrap_or(false) =>
{
return EventResult::consumed();
}
Event::Mouse {
event: MouseEvent::Hold(MouseButton::Left),
position,
offset,
} if scroller.get_scroller().get_show_scrollbars() => {
let position = position.saturating_sub(offset);
scroller.get_scroller_mut().drag(position);
}
Event::Mouse {
event: MouseEvent::Release(MouseButton::Left),
..
} => scroller.get_scroller_mut().release_grab(),
_ => return EventResult::Ignored,
}
scroller
.get_scroller_mut()
.set_scroll_strategy(SCROLL_STRATEGY);
on_scroll(scroller);
EventResult::consumed()
}
other => {
let inner_size = scroller.get_scroller().inner_size();
let important = important_area(scroller, inner_size);
scroller.get_scroller_mut().scroll_to_rect(important);
other
}
}
}