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use std::rc::Rc;
use direction::Direction;
use theme::ColorStyle;
use Cursive;
use With;
use vec::Vec2;
use view::View;
use event::*;
use Printer;
use unicode_width::UnicodeWidthStr;
/// 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::prelude::*;
/// 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>(label: &str, cb: F) -> Self
where F: Fn(&mut Cursive) + 'static
{
Button {
label: label.to_string(),
callback: Rc::new(cb),
enabled: true,
}
}
/// 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
}
}
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 x = printer.size.x - 1;
printer.with_color(style, |printer| {
printer.print((1, 0), &self.label);
printer.print((0, 0), "<");
printer.print((x, 0), ">");
});
}
fn get_min_size(&mut self, _: Vec2) -> Vec2 {
// Meh. Fixed size we are.
Vec2::new(2 + self.label.width(), 1)
}
fn on_event(&mut self, event: Event) -> EventResult {
match event {
// 10 is the ascii code for '\n', that is the return key
Event::Key(Key::Enter) => {
EventResult::Consumed(Some(self.callback.clone()))
}
_ => EventResult::Ignored,
}
}
fn take_focus(&mut self, _: Direction) -> bool {
self.enabled
}
}