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use {
Backend,
Color,
Colorable,
FontSize,
Frameable,
FramedRectangle,
IndexSlot,
Labelable,
Positionable,
Scalar,
Text,
Widget,
};
use widget;
pub struct Button<'a, F> {
common: widget::CommonBuilder,
maybe_label: Option<&'a str>,
maybe_react: Option<F>,
pub style: Style,
enabled: bool,
}
pub const KIND: widget::Kind = "Button";
widget_style!{
KIND;
style Style {
- color: Color { theme.shape_color }
- frame: Scalar { theme.frame_width }
- frame_color: Color { theme.frame_color }
- label_color: Color { theme.label_color }
- label_font_size: FontSize { theme.font_size_medium }
}
}
#[derive(Clone, Debug, PartialEq)]
pub struct State {
rectangle_idx: IndexSlot,
label_idx: IndexSlot,
}
impl<'a, F> Button<'a, F> {
pub fn new() -> Self {
Button {
common: widget::CommonBuilder::new(),
maybe_react: None,
maybe_label: None,
style: Style::new(),
enabled: true,
}
}
builder_methods!{
pub react { maybe_react = Some(F) }
pub enabled { enabled = bool }
}
}
impl<'a, F> Widget for Button<'a, F>
where F: FnOnce(),
{
type State = State;
type Style = Style;
fn common(&self) -> &widget::CommonBuilder {
&self.common
}
fn common_mut(&mut self) -> &mut widget::CommonBuilder {
&mut self.common
}
fn unique_kind(&self) -> widget::Kind {
KIND
}
fn init_state(&self) -> State {
State {
rectangle_idx: IndexSlot::new(),
label_idx: IndexSlot::new(),
}
}
fn style(&self) -> Style {
self.style.clone()
}
fn update<B: Backend>(self, args: widget::UpdateArgs<Self, B>) {
let widget::UpdateArgs { idx, state, style, rect, mut ui, .. } = args;
let color = {
let input = ui.widget_input(idx);
if input.clicks().left().next().is_some() {
if let Some(react) = self.maybe_react {
react()
}
}
let color = style.color(ui.theme());
input.mouse().map_or(color, |mouse| {
if mouse.buttons.left().is_down() {
color.clicked()
} else {
color.highlighted()
}
})
};
let rectangle_idx = state.rectangle_idx.get(&mut ui);
let dim = rect.dim();
let frame = style.frame(ui.theme());
let frame_color = style.frame_color(ui.theme());
FramedRectangle::new(dim)
.middle_of(idx)
.graphics_for(idx)
.color(color)
.frame(frame)
.frame_color(frame_color)
.set(rectangle_idx, &mut ui);
if let Some(label) = self.maybe_label {
let label_idx = state.label_idx.get(&mut ui);
let color = style.label_color(ui.theme());
let font_size = style.label_font_size(ui.theme());
Text::new(label)
.middle_of(rectangle_idx)
.graphics_for(idx)
.color(color)
.font_size(font_size)
.set(label_idx, &mut ui);
}
}
}
impl<'a, F> Colorable for Button<'a, F> {
builder_method!(color { style.color = Some(Color) });
}
impl<'a, F> Frameable for Button<'a, F> {
builder_methods!{
frame { style.frame = Some(Scalar) }
frame_color { style.frame_color = Some(Color) }
}
}
impl<'a, F> Labelable<'a> for Button<'a, F> {
builder_methods!{
label { maybe_label = Some(&'a str) }
label_color { style.label_color = Some(Color) }
label_font_size { style.label_font_size = Some(FontSize) }
}
}