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use {Cursive, Printer, With};
use align::HAlign;
use direction::Direction;
use event::*;
use theme::ColorStyle;
use unicode_width::UnicodeWidthStr;
use vec::Vec2;
use view::View;
/// Simple text label with a callback when <Enter> is pressed.
///
/// A button shows its content in a single line and has a fixed size.
///
/// # Examples
///
/// ```
/// # use cursive::views::Button;
/// let quit_button = Button::new("Quit", |s| s.quit());
/// ```
pub struct Button {
label: String,
callback: Callback,
enabled: bool,
}
impl Button {
/// Creates a new button with the given content and callback.
pub fn new<F, S: Into<String>>(label: S, cb: F) -> Self
where
F: Fn(&mut Cursive) + 'static,
{
Button {
label: label.into(),
callback: Callback::from_fn(cb),
enabled: true,
}
}
/// Sets the function to be called when the button is pressed.
///
/// Replaces the previous callback.
pub fn set_callback<F>(&mut self, cb: F)
where
F: Fn(&mut Cursive) + 'static,
{
self.callback = Callback::from_fn(cb);
}
/// Disables this view.
///
/// A disabled view cannot be selected.
pub fn disable(&mut self) {
self.enabled = false;
}
/// Disables this view.
///
/// Chainable variant.
pub fn disabled(self) -> Self {
self.with(Self::disable)
}
/// Re-enables this view.
pub fn enable(&mut self) {
self.enabled = true;
}
/// Enable or disable this view.
pub fn set_enabled(&mut self, enabled: bool) {
self.enabled = enabled;
}
/// Returns `true` if this view is enabled.
pub fn is_enabled(&self) -> bool {
self.enabled
}
fn req_size(&self) -> Vec2 {
Vec2::new(2 + self.label.width(), 1)
}
}
impl View for Button {
fn draw(&self, printer: &Printer) {
if printer.size.x == 0 {
return;
}
let style = if !self.enabled {
ColorStyle::Secondary
} else if !printer.focused {
ColorStyle::Primary
} else {
ColorStyle::Highlight
};
let offset =
HAlign::Center.get_offset(self.label.len() + 2, printer.size.x);
printer.with_color(style, |printer| {
printer.print((offset, 0), &format!("<{}>", self.label));
});
}
fn required_size(&mut self, _: Vec2) -> Vec2 {
// Meh. Fixed size we are.
self.req_size()
}
fn on_event(&mut self, event: Event) -> EventResult {
// eprintln!("{:?}", event);
// eprintln!("{:?}", self.req_size());
match event {
// 10 is the ascii code for '\n', that is the return key
Event::Key(Key::Enter) => {
EventResult::Consumed(Some(self.callback.clone()))
}
Event::Mouse {
event: MouseEvent::Release(MouseButton::Left),
position,
offset,
} if position.fits_in_rect(offset, self.req_size()) =>
{
EventResult::Consumed(Some(self.callback.clone()))
}
_ => EventResult::Ignored,
}
}
fn take_focus(&mut self, _: Direction) -> bool {
self.enabled
}
}