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// Copyright 2022 System76 <info@system76.com>
// SPDX-License-Identifier: MIT or Apache-2.0
//! A component which allows the caller to define what options ae in its list.
//!
//! On init of the view, an output is sent to the caller to request to load widgets.
//!
//! Clicking a button will open the webpage to that option.
//!
//! Clicking the clear button will clear the list box and send a command to the
//! background that waits 2 seconds before issuing a reload command back to the
//! component, which forwards the reload command back to the caller of the
//! component, which then issues to reload the widgets again.
use futures::FutureExt;
use gtk::prelude::*;
use relm4::*;
fn main() {
RelmApp::new("org.relm4.ProgressExample").run::<App>("Settings List Demo".into());
}
#[derive(Default)]
pub struct App {
/// Tracks progress status
computing: bool,
/// Contains output of a completed task.
task: Option<CmdOut>,
}
pub struct Widgets {
button: gtk::Button,
label: gtk::Label,
progress: gtk::ProgressBar,
}
#[derive(Debug)]
pub enum Input {
Compute,
}
#[derive(Debug)]
pub enum Output {
Clicked(u32),
}
#[derive(Debug)]
pub enum CmdOut {
/// Progress update from a command.
Progress(f32),
/// The final output of the command.
Finished(Result<String, ()>),
}
impl Component for App {
type Init = String;
type Input = Input;
type Output = Output;
type CommandOutput = CmdOut;
type Widgets = Widgets;
type Root = gtk::Window;
fn init_root() -> Self::Root {
gtk::Window::default()
}
fn init(
_args: Self::Init,
root: Self::Root,
sender: ComponentSender<Self>,
) -> ComponentParts<Self> {
relm4::view! {
container = gtk::Box {
set_halign: gtk::Align::Center,
set_valign: gtk::Align::Center,
set_width_request: 300,
set_spacing: 12,
set_margin_top: 4,
set_margin_bottom: 4,
set_margin_start: 12,
set_margin_end: 12,
set_orientation: gtk::Orientation::Horizontal,
gtk::Box {
set_spacing: 4,
set_hexpand: true,
set_valign: gtk::Align::Center,
set_orientation: gtk::Orientation::Vertical,
append: label = >k::Label {
set_xalign: 0.0,
set_label: "Find the answer to life:",
},
append: progress = >k::ProgressBar {
set_visible: false,
},
},
append: button = >k::Button {
set_label: "Compute",
connect_clicked => Input::Compute,
}
}
}
root.set_child(Some(&container));
ComponentParts {
model: App::default(),
widgets: Widgets {
label,
button,
progress,
},
}
}
fn update(&mut self, message: Self::Input, sender: ComponentSender<Self>, _root: &Self::Root) {
match message {
Input::Compute => {
self.computing = true;
sender.command(|out, shutdown| {
shutdown
// Performs this operation until a shutdown is triggered
.register(async move {
let mut progress = 0.0;
while progress < 1.0 {
out.send(CmdOut::Progress(progress)).unwrap();
progress += 0.1;
tokio::time::sleep(std::time::Duration::from_millis(333)).await;
}
out.send(CmdOut::Finished(Ok("42".into()))).unwrap();
})
// Perform task until a shutdown interrupts it
.drop_on_shutdown()
// Wrap into a `Pin<Box<Future>>` for return
.boxed()
});
}
}
}
fn update_cmd(
&mut self,
message: Self::CommandOutput,
_sender: ComponentSender<Self>,
_root: &Self::Root,
) {
if let CmdOut::Finished(_) = message {
self.computing = false;
}
self.task = Some(message);
}
fn update_view(&self, widgets: &mut Self::Widgets, _sender: ComponentSender<Self>) {
widgets.button.set_sensitive(!self.computing);
if let Some(ref progress) = self.task {
match progress {
CmdOut::Progress(p) => {
widgets.label.set_label("Searching for the answer...");
widgets.progress.set_visible(true);
widgets.progress.set_fraction(*p as f64);
}
CmdOut::Finished(result) => {
widgets.progress.set_visible(false);
widgets
.label
.set_label(&format!("The answer to life is: {result:?}"));
}
}
}
}
}