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Merge pull request #1003 from futurepaul/spinner-widget
Spinner widget
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| // Copyright 2020 The xi-editor Authors. | ||
| // | ||
| // Licensed under the Apache License, Version 2.0 (the "License"); | ||
| // you may not use this file except in compliance with the License. | ||
| // You may obtain a copy of the License at | ||
| // | ||
| // http://www.apache.org/licenses/LICENSE-2.0 | ||
| // | ||
| // Unless required by applicable law or agreed to in writing, software | ||
| // distributed under the License is distributed on an "AS IS" BASIS, | ||
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | ||
| // See the License for the specific language governing permissions and | ||
| // limitations under the License. | ||
|
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| //! An animated spinner widget. | ||
| use std::f64::consts::PI; | ||
|
|
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| use druid::kurbo::Line; | ||
| use druid::widget::prelude::*; | ||
| use druid::{theme, Color, Data, KeyOrValue, Point, Vec2}; | ||
|
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| /// An animated spinner widget for showing a loading state. | ||
| /// | ||
| /// To customize the spinner's size, you can place it inside a [`SizedBox`] | ||
| /// that has a fixed width and height. | ||
| /// | ||
| /// [`SizedBox`]: struct.SizedBox.html | ||
| pub struct Spinner { | ||
| t: f64, | ||
| color: KeyOrValue<Color>, | ||
| } | ||
|
|
||
| impl Spinner { | ||
| /// Create a spinner widget | ||
| pub fn new() -> Spinner { | ||
| Spinner::default() | ||
| } | ||
|
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| /// Builder-style method for setting the spinner's color. | ||
| /// | ||
| /// The argument can be either a `Color` or a [`Key<Color>`]. | ||
| /// | ||
| /// [`Key<Color>`]: ../struct.Key.html | ||
| pub fn with_color(mut self, color: impl Into<KeyOrValue<Color>>) -> Self { | ||
| self.color = color.into(); | ||
| self | ||
| } | ||
|
|
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| /// Set the spinner's color. | ||
| /// | ||
| /// The argument can be either a `Color` or a [`Key<Color>`]. | ||
| /// | ||
| /// [`Key<Color>`]: ../struct.Key.html | ||
| pub fn set_color(&mut self, color: impl Into<KeyOrValue<Color>>) { | ||
| self.color = color.into(); | ||
| } | ||
| } | ||
|
|
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| impl Default for Spinner { | ||
| fn default() -> Self { | ||
| Spinner { | ||
| t: 0.0, | ||
| color: theme::LABEL_COLOR.into(), | ||
| } | ||
| } | ||
| } | ||
|
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| impl<T: Data> Widget<T> for Spinner { | ||
| fn event(&mut self, _ctx: &mut EventCtx, _event: &Event, _data: &mut T, _env: &Env) {} | ||
|
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| fn lifecycle(&mut self, ctx: &mut LifeCycleCtx, event: &LifeCycle, _data: &T, _env: &Env) { | ||
| if let LifeCycle::WidgetAdded = event { | ||
| ctx.request_anim_frame(); | ||
| } | ||
|
|
||
| if let LifeCycle::AnimFrame(interval) = event { | ||
| self.t += (*interval as f64) * 1e-9; | ||
| if self.t >= 1.0 { | ||
| self.t = 0.0; | ||
| } | ||
| ctx.request_anim_frame(); | ||
| } | ||
| } | ||
|
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| fn update(&mut self, _ctx: &mut UpdateCtx, _old_data: &T, _data: &T, _env: &Env) {} | ||
|
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| fn layout( | ||
| &mut self, | ||
| _layout_ctx: &mut LayoutCtx, | ||
| bc: &BoxConstraints, | ||
| _data: &T, | ||
| env: &Env, | ||
| ) -> Size { | ||
| bc.debug_check("Spinner"); | ||
|
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||
| if bc.is_width_bounded() && bc.is_height_bounded() { | ||
| bc.max() | ||
| } else { | ||
| bc.constrain(Size::new( | ||
| env.get(theme::BASIC_WIDGET_HEIGHT), | ||
| env.get(theme::BASIC_WIDGET_HEIGHT), | ||
| )) | ||
| } | ||
| } | ||
|
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| fn paint(&mut self, ctx: &mut PaintCtx, _data: &T, env: &Env) { | ||
| let t = self.t; | ||
| let (width, height) = (ctx.size().width, ctx.size().height); | ||
| let center = Point::new(width / 2.0, height / 2.0); | ||
| let (r, g, b, original_alpha) = Color::as_rgba(&self.color.resolve(env)); | ||
| let scale_factor = width.min(height) / 40.0; | ||
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| for step in 1..=12 { | ||
| let step = f64::from(step); | ||
| let fade_t = (t * 12.0 + 1.0).trunc(); | ||
| let fade = ((fade_t + step).rem_euclid(12.0) / 12.0) + 1.0 / 12.0; | ||
| let angle = Vec2::from_angle((step / 12.0) * -2.0 * PI); | ||
| let ambit_start = center + (10.0 * scale_factor * angle); | ||
| let ambit_end = center + (20.0 * scale_factor * angle); | ||
| let color = Color::rgba(r, g, b, fade * original_alpha); | ||
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| ctx.stroke( | ||
| Line::new(ambit_start, ambit_end), | ||
| &color, | ||
| 3.0 * scale_factor, | ||
| ); | ||
| } | ||
| } | ||
| } |