pub fn channel<T: Send + Sync>() -> (Sender<T>, Receiver<T>)
Expand description
Creates a channel returning a Sender and Receiver structs (mpsc: multiple producer single consumer).
Examples found in repository?
examples/messages.rs (line 23)
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fn main() {
let app = app::App::default();
let mut wind = Window::default().with_size(400, 300);
let mut frame = Frame::default().size_of(&wind).with_label("0");
let mut val = 0;
wind.show();
let (s, r) = app::channel::<Message>();
std::thread::spawn(move || loop {
app::sleep(1.);
s.send(Message::Increment(2));
});
while app.wait() {
if let Some(Message::Increment(step)) = r.recv() {
inc_frame(&mut frame, &mut val, step)
}
}
}
More examples
examples/counter2.rs (line 22)
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fn main() -> Result<(), Box<dyn std::error::Error>> {
let app = app::App::default();
let mut wind = Window::default().with_size(160, 200).with_label("Counter");
let mut flex = Flex::default_fill().column();
flex.set_margins(30, 40, 30, 40);
flex.set_pad(10);
let mut but_inc = Button::default().with_label("+");
let mut frame = Frame::default().with_label("0");
let mut but_dec = Button::default().with_label("-");
flex.end();
wind.end();
wind.show();
let (s, r) = app::channel::<Message>();
but_inc.emit(s, Message::Increment);
but_dec.emit(s, Message::Decrement);
while app.wait() {
let label: i32 = frame.label().parse()?;
if let Some(msg) = r.recv() {
match msg {
Message::Increment => frame.set_label(&(label + 1).to_string()),
Message::Decrement => frame.set_label(&(label - 1).to_string()),
}
}
}
Ok(())
}
examples/temp_converter2.rs (line 40)
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pub fn new() -> Self {
let a = app::App::default();
MyApp::init_styles();
let (s, r) = app::channel();
let (inp1, inp2) = {
let mut win = window::Window::default().with_size(150, 200);
let mut flex = group::Flex::default()
.with_size(130, 180)
.center_of(&win)
.column();
make_label("Celcius");
let mut inp1 = input::FloatInput::default().with_size(0, 40);
make_label("Fahrenheit");
let mut inp2 = input::FloatInput::default().with_size(0, 40);
flex.fixed(&inp1, 30);
flex.fixed(&inp2, 30);
flex.end();
win.end();
win.make_resizable(true);
win.show();
inp1.set_value(&format!("{}", 0.0));
inp2.set_value(&format!("{}", 32.0));
inp1.set_trigger(CallbackTrigger::Changed);
inp2.set_trigger(CallbackTrigger::Changed);
inp1.emit(s, Message::CelciusChanged);
inp2.emit(s, Message::FahrenheitChanged);
(inp1, inp2)
};
Self { a, inp1, inp2, r }
}
examples/closable_tabs2.rs (line 172)
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fn main() {
use fltk::{prelude::*, *};
// Create groups to be used as content for tabs
pub fn create_tab(from: i32, to: i32) -> group::Group {
let grp = group::Group::new(0, 0, 800, 600, None);
for idx in from..to {
button::Button::new(
idx * 10 + (idx - from) * 42,
idx * 10 + (idx - from) * 42,
80,
40,
None,
)
.with_label(&format!("button {idx}"));
}
grp.end();
grp
}
let app = app::App::default();
let mut win = window::Window::default().with_size(800, 600);
let (s, r) = app::channel::<closable_tab::Message>();
let mut tabs = closable_tab::ClosableTab::new(0, 0, 800, 600, &s);
win.end();
win.show();
tabs.add(&mut create_tab(1, 3), "tab 1");
tabs.add(&mut create_tab(4, 7), "tab 2");
tabs.add(&mut create_tab(8, 11), "tab 3");
tabs.add(&mut create_tab(12, 15), "tab 4");
tabs.add(&mut create_tab(16, 22), "tab 5");
tabs.set_foreground(2);
while app.wait() {
use closable_tab::Message::*;
if let Some(msg) = r.recv() {
match msg {
Foreground(idx) => {
tabs.set_foreground(idx);
}
Delete(idx) => {
tabs.remove(idx);
}
InsertNew(_) => {}
}
}
}
}
examples/threads_windows.rs (line 37)
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fn main() -> Result<(), Box<dyn std::error::Error>> {
let app = app::App::default();
let mut wind = Window::default().with_size(160, 200).with_label("Counter");
let mut col = Flex::default()
.with_size(120, 140)
.center_of(&wind)
.column();
col.set_spacing(10);
let mut but_inc = Button::default().with_label("+");
let mut frame = Frame::default().with_label("0");
let mut but_dec = Button::default().with_label("-");
col.end();
wind.end();
wind.show();
let mut msg_wind = Window::default().with_size(120, 100).with_label("Message");
let mut msgview = HelpView::default().with_size(120, 100);
msgview.set_align(Align::Center);
msg_wind.end();
let (s, r) = app::channel::<Message>();
but_inc.set_callback({
move |_| {
s.send(Message::Deactivate);
thread::spawn(move || {
thread::sleep(Duration::from_secs(1));
s.send(Message::Increment);
s.send(Message::Message("Incremented"));
s.send(Message::Activate);
});
}
});
but_dec.set_callback({
move |_| {
s.send(Message::Deactivate);
thread::spawn(move || {
thread::sleep(Duration::from_secs(1));
s.send(Message::Decrement);
s.send(Message::Message("Decremented"));
s.send(Message::Activate);
});
}
});
while app.wait() {
if let Some(msg) = r.recv() {
let label: i32 = frame.label().parse()?;
match msg {
Message::Increment => frame.set_label(&(label + 1).to_string()),
Message::Decrement => frame.set_label(&(label - 1).to_string()),
Message::Activate => {
but_inc.activate();
but_dec.activate();
}
Message::Deactivate => {
but_inc.deactivate();
but_dec.deactivate();
}
Message::Message(s) => {
msgview.set_value(s);
msg_wind.show();
}
}
}
}
Ok(())
}
examples/editor2.rs (line 181)
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pub fn new(args: Vec<String>) -> Self {
let app = app::App::default().with_scheme(app::Scheme::Gtk);
app::background(211, 211, 211);
let (s, r) = app::channel::<Message>();
let mut buf = text::TextBuffer::default();
buf.set_tab_distance(4);
let mut main_win = window::Window::default()
.with_size(800, 600)
.center_screen()
.with_label("RustyEd");
let menu = MyMenu::new(&s);
let modified = false;
menu.menu.find_item("&File/Save\t").unwrap().deactivate();
let mut editor = MyEditor::new(buf.clone());
editor.emit(s, Message::Changed);
main_win.make_resizable(true);
// only resize editor, not the menu bar
main_win.resizable(&*editor);
main_win.end();
main_win.show();
main_win.set_callback(move |_| {
if app::event() == Event::Close {
s.send(Message::Quit);
}
});
let filename = if args.len() > 1 {
let file = path::Path::new(&args[1]);
assert!(
file.exists() && file.is_file(),
"An error occurred while opening the file!"
);
match buf.load_file(&args[1]) {
Ok(_) => Some(PathBuf::from(args[1].clone())),
Err(e) => {
dialog::alert(
center().0 - 200,
center().1 - 100,
&format!("An issue occured while loading the file: {e}"),
);
None
}
}
} else {
None
};
// Handle drag and drop
editor.handle({
let mut dnd = false;
let mut released = false;
let buf = buf.clone();
move |_, ev| match ev {
Event::DndEnter => {
dnd = true;
true
}
Event::DndDrag => true,
Event::DndRelease => {
released = true;
true
}
Event::Paste => {
if dnd && released {
let path = app::event_text();
let path = path.trim();
let path = path.replace("file://", "");
let path = std::path::PathBuf::from(&path);
if path.exists() {
// we use a timeout to avoid pasting the path into the buffer
app::add_timeout3(0.0, {
let mut buf = buf.clone();
move |_| match buf.load_file(&path) {
Ok(_) => (),
Err(e) => dialog::alert(
center().0 - 200,
center().1 - 100,
&format!("An issue occured while loading the file: {e}"),
),
}
});
}
dnd = false;
released = false;
true
} else {
false
}
}
Event::DndLeave => {
dnd = false;
released = false;
true
}
_ => false,
}
});
// What shows when we attempt to print
let mut printable = text::TextDisplay::default();
printable.set_frame(FrameType::NoBox);
printable.set_scrollbar_size(0);
printable.set_buffer(Some(buf.clone()));
Self {
app,
modified,
filename,
r,
main_win,
menu,
buf,
editor,
printable,
}
}
Additional examples can be found in: