Struct fltk::app::Receiver

pub struct Receiver<T: Send + Sync> { /* private fields */ }

Creates a receiver struct

Implementations

impl<T: 'static + Send + Sync> Receiver<T>

pub fn recv(&self) -> Option<T>

Receives a message

Examples found in repository

examples/messages.rs (line 31)

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)
        }
    }
}

examples/temp_converter2.rs (line 85)

    pub fn run(&mut self) {
        while self.a.wait() {
            if let Some(msg) = self.r.recv() {
                match msg {
                    Message::CelciusChanged => {
                        self.inp2.set_value(&format!(
                            "{:.4}",
                            c_to_f(self.inp1.value().parse().unwrap_or(0.0))
                        ));
                    }
                    Message::FahrenheitChanged => {
                        self.inp1.set_value(&format!(
                            "{:.4}",
                            f_to_c(self.inp2.value().parse().unwrap_or(0.0))
                        ));
                    }
                }
            }
        }
    }

examples/counter2.rs (line 30)

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/closable_tabs2.rs (line 184)

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 63)

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 353)

    pub fn launch(&mut self) {
        while self.app.wait() {
            use Message::*;
            if let Some(msg) = self.r.recv() {
                match msg {
                    Changed => {
                        if !self.modified {
                            self.modified = true;
                            self.menu.menu.find_item("&File/Save\t").unwrap().activate();
                            self.menu.menu.find_item("&File/Quit\t").unwrap().set_label_color(Color::Red);
                            let name = match &self.filename {
                                Some(f) => f.to_string_lossy().to_string(),
                                None => "(Untitled)".to_string(),
                            };
                            self.main_win.set_label(&format!("* {name} - RustyEd"));
                        }
                    }
                    New => {
                        if self.buf.text() != "" {
                            let clear = if let Some(x) = dialog::choice2(center().0 - 200, center().1 - 100, "File unsaved, Do you wish to continue?", "Yes", "No!", "") {
                                x == 0
                            } else {
                                false
                            };
                            if clear {
                                self.buf.set_text("");
                            }
                        }
                    },
                    Open => {
                        let mut dlg = dialog::FileDialog::new(dialog::FileDialogType::BrowseFile);
                        dlg.set_option(dialog::FileDialogOptions::NoOptions);
                        dlg.set_filter("*.{txt,rs,toml}");
                        dlg.show();
                        let filename = dlg.filename();
                        if !filename.to_string_lossy().to_string().is_empty() {
                            if filename.exists() {
                                match self.buf.load_file(&filename) {
                                    Ok(_) => self.filename = Some(filename),
                                    Err(e) => dialog::alert(center().0 - 200, center().1 - 100, &format!("An issue occured while loading the file: {e}")),
                                }
                            } else {
                                dialog::alert(center().0 - 200, center().1 - 100, "File does not exist!")
                            }
                        }
                    },
                    Save => { self.save_file().unwrap(); },
                    SaveAs => { self.save_file_as().unwrap(); },
                    Print => {
                        let mut printer = printer::Printer::default();
                        if printer.begin_job(0).is_ok() {
                            let (w, h) = printer.printable_rect();
                            self.printable.set_size(w - 40, h - 40);
                            // Needs cleanup
                            let line_count = self.printable.count_lines(0, self.printable.buffer().unwrap().length(), true) / 45;
                            for i in 0..=line_count {
                                self.printable.scroll(45 * i, 0);
                                printer.begin_page().ok();
                                printer.print_widget(&self.printable, 20, 20);
                                printer.end_page().ok();
                            }
                            printer.end_job();
                        }
                    },
                    Quit => {
                        if self.modified {
                            match dialog::choice2(center().0 - 200, center().1 - 100,
                                "Would you like to save your work?", "Yes", "No", "") {
                                Some(0) => {
                                    if self.save_file().unwrap() {
                                        self.app.quit();
                                    }
                                },
                                Some(1) => { self.app.quit() },
                                Some(_) | None  => (),
                            }
                        } else {
                            self.app.quit();
                        }
                    },
                    Cut => self.editor.cut(),
                    Copy => self.editor.copy(),
                    Paste => self.editor.paste(),
                    About => dialog::message(center().0 - 300, center().1 - 100, "This is an example application written in Rust and using the FLTK Gui library."),
                }
            }
        }
    }

Additional examples can be found in:

• examples/calculator.rs
• examples/calculator2.rs

pub fn get() -> Self

Get the global receiver

Trait Implementations

impl<T: Send + Sync> Clone for Receiver<T>

fn clone(&self) -> Self

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl<T: Debug + Send + Sync> Debug for Receiver<T>

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl<T: Copy + Send + Sync> Copy for Receiver<T>

impl<T: Send + Sync> Send for Receiver<T>

impl<T: Send + Sync> Sync for Receiver<T>