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use crossterm::event::{MouseEvent, MouseEventKind};
use crate::app::state::AppState;
impl AppState {
fn update_selection_cursor(
&mut self,
pane_id: crate::layout::PaneId,
screen_col: u16,
screen_row: u16,
) {
let Some(info) = self.pane_info_by_id(pane_id).cloned() else {
return;
};
let metrics = self.pane_scroll_metrics(pane_id);
if let Some(selection) = self.selection.as_mut() {
selection.drag(screen_col, screen_row, info.inner_rect, metrics);
}
}
fn selection_edge_scroll_lines(distance: u16) -> usize {
usize::from(distance).saturating_mul(3).clamp(3, 15)
}
pub(super) fn update_selection_drag(&mut self, screen_col: u16, screen_row: u16) {
let Some(pane_id) = self.selection.as_ref().map(|selection| selection.pane_id) else {
return;
};
let Some(info) = self.pane_info_by_id(pane_id).cloned() else {
return;
};
let bottom = info.inner_rect.y + info.inner_rect.height.saturating_sub(1);
if screen_row < info.inner_rect.y {
self.scroll_pane_up(
pane_id,
Self::selection_edge_scroll_lines(info.inner_rect.y - screen_row),
);
} else if screen_row > bottom {
self.scroll_pane_down(
pane_id,
Self::selection_edge_scroll_lines(screen_row - bottom),
);
}
self.update_selection_cursor(pane_id, screen_col, screen_row);
}
pub(super) fn scroll_selection_with_wheel(&mut self, mouse: MouseEvent) -> bool {
const LINES_PER_NOTCH: usize = 3;
let Some(selection) = self.selection.as_ref() else {
return false;
};
if !selection.is_in_progress() {
return false;
}
let pane_id = selection.pane_id;
self.focus_pane(pane_id);
match mouse.kind {
MouseEventKind::ScrollUp => self.scroll_pane_up(pane_id, LINES_PER_NOTCH),
MouseEventKind::ScrollDown => self.scroll_pane_down(pane_id, LINES_PER_NOTCH),
_ => return false,
}
self.update_selection_cursor(pane_id, mouse.column, mouse.row);
true
}
}
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