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checkbox.rs
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checkbox.rs
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// Copyright 2019 the Druid Authors
// SPDX-License-Identifier: Apache-2.0
//! A checkbox widget.
use crate::debug_state::DebugState;
use crate::kurbo::{BezPath, Size};
use crate::piet::{LineCap, LineJoin, LinearGradient, RenderContext, StrokeStyle, UnitPoint};
use crate::theme;
use crate::widget::{prelude::*, Label, LabelText};
use tracing::{instrument, trace};
/// A checkbox that toggles a `bool`.
pub struct Checkbox {
child_label: Label<bool>,
}
impl Checkbox {
/// Create a new `Checkbox` with a text label.
pub fn new(text: impl Into<LabelText<bool>>) -> Checkbox {
Self::from_label(Label::new(text))
}
/// Create a new `Checkbox` with the provided [`Label`].
pub fn from_label(label: Label<bool>) -> Checkbox {
Checkbox { child_label: label }
}
/// Update the text label.
pub fn set_text(&mut self, label: impl Into<LabelText<bool>>) {
self.child_label.set_text(label);
}
}
impl Widget<bool> for Checkbox {
#[instrument(name = "CheckBox", level = "trace", skip(self, ctx, event, data, _env))]
fn event(&mut self, ctx: &mut EventCtx, event: &Event, data: &mut bool, _env: &Env) {
match event {
Event::MouseDown(_) => {
if !ctx.is_disabled() {
ctx.set_active(true);
ctx.request_paint();
trace!("Checkbox {:?} pressed", ctx.widget_id());
}
}
Event::MouseUp(_) => {
if ctx.is_active() && !ctx.is_disabled() {
if ctx.is_hot() {
if *data {
*data = false;
trace!("Checkbox {:?} released - unchecked", ctx.widget_id());
} else {
*data = true;
trace!("Checkbox {:?} released - checked", ctx.widget_id());
}
}
ctx.request_paint();
}
ctx.set_active(false);
}
_ => (),
}
}
#[instrument(name = "CheckBox", level = "trace", skip(self, ctx, event, data, env))]
fn lifecycle(&mut self, ctx: &mut LifeCycleCtx, event: &LifeCycle, data: &bool, env: &Env) {
self.child_label.lifecycle(ctx, event, data, env);
if let LifeCycle::HotChanged(_) | LifeCycle::DisabledChanged(_) = event {
ctx.request_paint();
}
}
#[instrument(
name = "CheckBox",
level = "trace",
skip(self, ctx, old_data, data, env)
)]
fn update(&mut self, ctx: &mut UpdateCtx, old_data: &bool, data: &bool, env: &Env) {
self.child_label.update(ctx, old_data, data, env);
ctx.request_paint();
}
#[instrument(name = "CheckBox", level = "trace", skip(self, ctx, bc, data, env))]
fn layout(&mut self, ctx: &mut LayoutCtx, bc: &BoxConstraints, data: &bool, env: &Env) -> Size {
bc.debug_check("Checkbox");
let x_padding = env.get(theme::WIDGET_CONTROL_COMPONENT_PADDING);
let check_size = env.get(theme::BASIC_WIDGET_HEIGHT);
let label_size = self.child_label.layout(ctx, bc, data, env);
let desired_size = Size::new(
check_size + x_padding + label_size.width,
check_size.max(label_size.height),
);
let our_size = bc.constrain(desired_size);
let baseline = self.child_label.baseline_offset() + (our_size.height - label_size.height);
ctx.set_baseline_offset(baseline);
trace!("Computed layout: size={}, baseline={}", our_size, baseline);
our_size
}
#[instrument(name = "CheckBox", level = "trace", skip(self, ctx, data, env))]
fn paint(&mut self, ctx: &mut PaintCtx, data: &bool, env: &Env) {
let size = env.get(theme::BASIC_WIDGET_HEIGHT);
let x_padding = env.get(theme::WIDGET_CONTROL_COMPONENT_PADDING);
let border_width = 1.;
let rect = Size::new(size, size)
.to_rect()
.inset(-border_width / 2.)
.to_rounded_rect(2.);
//Paint the background
let background_gradient = LinearGradient::new(
UnitPoint::TOP,
UnitPoint::BOTTOM,
(
env.get(theme::BACKGROUND_LIGHT),
env.get(theme::BACKGROUND_DARK),
),
);
ctx.fill(rect, &background_gradient);
let border_color = if ctx.is_hot() && !ctx.is_disabled() {
env.get(theme::BORDER_LIGHT)
} else {
env.get(theme::BORDER_DARK)
};
ctx.stroke(rect, &border_color, border_width);
if *data {
// Paint the checkmark
let x_offset = (rect.width() - 10.0) / 2.0;
let y_offset = (rect.height() - 8.0) / 2.0;
let mut path = BezPath::new();
path.move_to((x_offset, y_offset + 4.0));
path.line_to((x_offset + 4.0, y_offset + 8.0));
path.line_to((x_offset + 10.0, y_offset));
let style = StrokeStyle::new()
.line_cap(LineCap::Round)
.line_join(LineJoin::Round);
let brush = if ctx.is_disabled() {
env.get(theme::DISABLED_TEXT_COLOR)
} else {
env.get(theme::TEXT_COLOR)
};
ctx.stroke_styled(path, &brush, 2., &style);
}
// Paint the text label
self.child_label.draw_at(ctx, (size + x_padding, 0.0));
}
fn debug_state(&self, data: &bool) -> DebugState {
let display_value = if *data {
format!("[X] {}", self.child_label.text())
} else {
format!("[_] {}", self.child_label.text())
};
DebugState {
display_name: self.short_type_name().to_string(),
main_value: display_value,
..Default::default()
}
}
}