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//! The press behaviour shared by buttons and toggles: Enter or Space while focused, or a click
//! released over the widget.
use crate::event::{Event, MouseButton, MouseKind};
use crate::keymap::Key;
use crate::widget::EventCx;
/// What an event meant to a pressable widget.
#[derive(Debug, Clone, Copy, PartialEq, Eq)]
pub(crate) enum Press {
/// Not a press; let it bubble.
Ignored,
/// Part of a press that is not complete yet, such as the mouse going down.
Used,
/// Enter or Space while focused.
Key,
/// A left click released over the widget, at this cell.
Click(i32, i32),
}
/// Reads `event` as a press. The mouse is captured on the way down so the release is seen even
/// when it happens outside the widget; releasing outside cancels. A release is a click only when
/// the press began on this widget: when a press elsewhere changes the screen, its release can
/// land on a button that was not there when the mouse button went down, and pressing it would act on
/// something the user never clicked.
pub(crate) fn read<Msg>(cx: &mut EventCx<'_, Msg>, event: &Event) -> Press {
match event {
Event::Key(key) if key.is_plain(Key::Enter) || key.is_plain(Key::Space) => Press::Key,
Event::Mouse(mouse) => match mouse.kind {
MouseKind::Down(MouseButton::Left) => {
cx.capture_pointer();
Press::Used
}
MouseKind::Up(MouseButton::Left) if cx.holds_pointer() && cx.area().contains(mouse.x, mouse.y) => {
Press::Click(mouse.x, mouse.y)
}
MouseKind::Up(MouseButton::Left) => Press::Used,
_ => Press::Ignored,
},
_ => Press::Ignored,
}
}