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Showcase graceful exiting in `events` example

This commit is contained in:
Héctor Ramón Jiménez 2021-03-30 21:45:49 +02:00
parent 67db13ff7c
commit 8f952452ce
1 changed files with 37 additions and 10 deletions
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47
examples/events/src/main.rs
View File

@ -1,22 +1,30 @@
use iced::{ use iced::{
executor, Align, Application, Checkbox, Clipboard, Column, Command, button, executor, Align, Application, Button, Checkbox, Clipboard, Column,
Container, Element, Length, Settings, Subscription, Text, Command, Container, Element, HorizontalAlignment, Length, Settings,
Subscription, Text,
}; };
use iced_native::{window, Event};
pub fn main() -> iced::Result { pub fn main() -> iced::Result {
Events::run(Settings::default()) Events::run(Settings {
exit_on_close_request: false,
..Settings::default()
})
} }
#[derive(Debug, Default)] #[derive(Debug, Default)]
struct Events { struct Events {
last: Vec<iced_native::Event>, last: Vec<iced_native::Event>,
enabled: bool, enabled: bool,
exit: button::State,
should_exit: bool,
} }
#[derive(Debug, Clone)] #[derive(Debug, Clone)]
enum Message { enum Message {
EventOccurred(iced_native::Event), EventOccurred(iced_native::Event),
Toggled(bool), Toggled(bool),
Exit,
} }
impl Application for Events { impl Application for Events {
@ -38,27 +46,35 @@ impl Application for Events {
_clipboard: &mut Clipboard, _clipboard: &mut Clipboard,
) -> Command<Message> { ) -> Command<Message> {
match message { match message {
Message::EventOccurred(event) => { Message::EventOccurred(event) if self.enabled => {
self.last.push(event); self.last.push(event);
if self.last.len() > 5 { if self.last.len() > 5 {
let _ = self.last.remove(0); let _ = self.last.remove(0);
} }
} }
Message::EventOccurred(event) => {
if let Event::Window(window::Event::CloseRequested) = event {
self.should_exit = true;
}
}
Message::Toggled(enabled) => { Message::Toggled(enabled) => {
self.enabled = enabled; self.enabled = enabled;
} }
Message::Exit => {
self.should_exit = true;
}
}; };
Command::none() Command::none()
} }
fn subscription(&self) -> Subscription<Message> { fn subscription(&self) -> Subscription<Message> {
if self.enabled { iced_native::subscription::events().map(Message::EventOccurred)
iced_native::subscription::events().map(Message::EventOccurred) }
} else {
Subscription::none() fn should_exit(&self) -> bool {
} self.should_exit
} }
fn view(&mut self) -> Element<Message> { fn view(&mut self) -> Element<Message> {
@ -75,11 +91,22 @@ impl Application for Events {
Message::Toggled, Message::Toggled,
); );
let exit = Button::new(
&mut self.exit,
Text::new("Exit")
.width(Length::Fill)
.horizontal_alignment(HorizontalAlignment::Center),
)
.width(Length::Units(100))
.padding(10)
.on_press(Message::Exit);
let content = Column::new() let content = Column::new()
.align_items(Align::Center) .align_items(Align::Center)
.spacing(20) .spacing(20)
.push(events) .push(events)
.push(toggle); .push(toggle)
.push(exit);
Container::new(content) Container::new(content)
.width(Length::Fill) .width(Length::Fill)