Struct fltk::app::App

source · 
pub struct App {}
Expand description

Basic Application struct, used to instantiate, set the scheme and run the event loop

Implementations§

source§

impl App

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pub fn set_scheme(&mut self, scheme: Scheme)

Sets the scheme of the application

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pub fn with_scheme(self, scheme: Scheme) -> App

Sets the scheme of the application

Examples found in repository?
examples/paint.rs (line 89)
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fn main() {
    let app = app::App::default().with_scheme(app::Scheme::Gtk);

    let mut wind = Window::default()
        .with_size(WIDTH, HEIGHT)
        .with_label("RustyPainter");

    Canvas::new(WIDTH - 10, HEIGHT - 10);

    wind.end();
    wind.show();

    app.run().unwrap();
}
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examples/tabs.rs (line 42)
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fn main() {
    let app = app::App::default().with_scheme(app::Scheme::Gtk);
    app::background(221, 221, 221);

    let mut wind = Window::default()
        .with_size(500, 450)
        .with_label("Tabs")
        .center_screen();

    draw_gallery();

    wind.make_resizable(true);
    wind.end();
    wind.show();

    app.run().unwrap();
}
examples/flex.rs (line 4)
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fn main() {
    let a = app::App::default().with_scheme(app::Scheme::Gtk);
    let mut win = window::Window::default().with_size(640, 480);
    let mut col = group::Flex::default_fill().column();
    main_panel(&mut col);
    col.end();
    win.resizable(&col);
    win.set_color(enums::Color::from_rgb(250, 250, 250));
    win.end();
    win.show();
    win.size_range(600, 400, 0, 0);
    a.run().unwrap();
}
examples/wizard.rs (line 56)
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fn main() {
    let app = app::App::default().with_scheme(app::Scheme::Gtk);
    let mut win = window::Window::default().with_size(400, 300);
    let _but = {
        let mut b = button::Button::default()
            .with_size(160, 40)
            .with_label("Show wizard")
            .center_of(&win);
        b.set_callback(show_wizard);
        b
    };
    win.end();
    win.show();
    app.run().unwrap();
}
examples/image.rs (line 5)
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fn main() -> Result<(), Box<dyn Error>> {
    let app = app::App::default().with_scheme(app::Scheme::Gleam);
    let mut wind = Window::default().with_size(400, 300);
    let mut frame = Frame::default_fill();

    let mut image = SharedImage::load("screenshots/calc.jpg")?;
    image.scale(200, 200, true, true);

    frame.set_image(Some(image));

    // // To remove an image
    // frame.set_image(None::<SharedImage>);

    wind.end();
    wind.make_resizable(true);
    wind.show();

    app.run()?;
    Ok(())
}
examples/hello_svg.rs (line 10)
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fn main() {
    let app = app::App::default().with_scheme(app::Scheme::Gleam);

    let mut wind = Window::new(100, 100, 400, 300, "Hello from rust");

    let mut frame = Frame::default().with_size(360, 260).center_of_parent();
    frame.set_frame(FrameType::EngravedBox);
    let mut image1 = SvgImage::load("screenshots/RustLogo.svg").unwrap();
    image1.scale(200, 200, true, true);
    frame.set_image(Some(image1));

    wind.make_resizable(true);
    wind.end();
    wind.show();
    wind.set_icon(Some(SvgImage::from_data(IMAGE2).unwrap()));

    app.run().unwrap();
}
Additional examples can be found in:
source

pub fn scheme(self) -> Scheme

Gets the scheme of the application

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pub fn run(self) -> Result<(), FltkError>

Runs the event loop

Errors

Can error on failure to run the application

Examples found in repository?
examples/paint.rs (line 100)
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fn main() {
    let app = app::App::default().with_scheme(app::Scheme::Gtk);

    let mut wind = Window::default()
        .with_size(WIDTH, HEIGHT)
        .with_label("RustyPainter");

    Canvas::new(WIDTH - 10, HEIGHT - 10);

    wind.end();
    wind.show();

    app.run().unwrap();
}
More examples
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examples/tabs.rs (line 56)
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fn main() {
    let app = app::App::default().with_scheme(app::Scheme::Gtk);
    app::background(221, 221, 221);

    let mut wind = Window::default()
        .with_size(500, 450)
        .with_label("Tabs")
        .center_screen();

    draw_gallery();

    wind.make_resizable(true);
    wind.end();
    wind.show();

    app.run().unwrap();
}
examples/hello_button.rs (line 13)
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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().with_size(200, 100).center_of(&wind);
    let mut but = Button::new(160, 210, 80, 40, "Click me!");
    wind.end();
    wind.show();

    but.set_callback(move |_| frame.set_label("Hello world"));

    app.run().unwrap();
}
examples/flex.rs (line 14)
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fn main() {
    let a = app::App::default().with_scheme(app::Scheme::Gtk);
    let mut win = window::Window::default().with_size(640, 480);
    let mut col = group::Flex::default_fill().column();
    main_panel(&mut col);
    col.end();
    win.resizable(&col);
    win.set_color(enums::Color::from_rgb(250, 250, 250));
    win.end();
    win.show();
    win.size_range(600, 400, 0, 0);
    a.run().unwrap();
}
examples/wizard.rs (line 68)
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fn main() {
    let app = app::App::default().with_scheme(app::Scheme::Gtk);
    let mut win = window::Window::default().with_size(400, 300);
    let _but = {
        let mut b = button::Button::default()
            .with_size(160, 40)
            .with_label("Show wizard")
            .center_of(&win);
        b.set_callback(show_wizard);
        b
    };
    win.end();
    win.show();
    app.run().unwrap();
}
examples/custom_choice.rs (line 179)
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fn main() {
    let app = app::App::default();
    let mut win = window::Window::default().with_size(400, 300);
    let mut choice = MyChoice::new(160, 200, 100, 30, None);
    choice.add_choices(&["choice1", "choice2", "choice3"]);
    choice.set_current_choice(1);
    choice.button().set_frame(FrameType::BorderBox);
    choice.frame().set_frame(FrameType::BorderBox);
    win.end();
    win.show();
    app.run().unwrap();
}
Additional examples can be found in:
source

pub fn wait(self) -> bool

Wait for incoming messages. Calls to redraw within wait require an explicit sleep

Examples found in repository?
examples/messages.rs (line 30)
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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
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examples/temp_converter2.rs (line 84)
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    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/system_fonts.rs (line 41)
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fn main() {
    let app = app::App::default().load_system_fonts();
    // To load a font by path, check the App::load_font() method
    let fonts = app::fonts();
    // println!("{:?}", fonts);
    let mut wind = window::Window::default().with_size(400, 300);
    let mut frame = frame::Frame::default().size_of(&wind);
    frame.set_label_size(30);
    wind.set_color(enums::Color::White);
    wind.end();
    wind.show();
    println!("The system has {} fonts!\nStarting slideshow!", fonts.len());
    let mut i = 0;
    while app.wait() {
        if i == fonts.len() {
            i = 0;
        }
        frame.set_label(&format!("[{}]", fonts[i]));
        frame.set_label_font(enums::Font::by_index(i));
        app::sleep(0.5);
        i += 1;
    }
}
examples/counter2.rs (line 27)
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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/closable_tabs2.rs (line 182)
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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 62)
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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(())
}
Additional examples can be found in:
source

pub fn load_system_fonts(self) -> Self

Loads system fonts

Examples found in repository?
examples/system_fonts.rs (line 29)
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fn main() {
    let app = app::App::default().load_system_fonts();
    // To load a font by path, check the App::load_font() method
    let fonts = app::fonts();
    // println!("{:?}", fonts);
    let mut wind = window::Window::default().with_size(400, 300);
    let mut frame = frame::Frame::default().size_of(&wind);
    frame.set_label_size(30);
    wind.set_color(enums::Color::White);
    wind.end();
    wind.show();
    println!("The system has {} fonts!\nStarting slideshow!", fonts.len());
    let mut i = 0;
    while app.wait() {
        if i == fonts.len() {
            i = 0;
        }
        frame.set_label(&format!("[{}]", fonts[i]));
        frame.set_label_font(enums::Font::by_index(i));
        app::sleep(0.5);
        i += 1;
    }
}
source

pub fn load_font<P: AsRef<Path>>(self, path: P) -> Result<String, FltkError>

Loads a font from a path. On success, returns a String with the ttf Font Family name. The font’s index is always 16. As such only one font can be loaded at a time. The font name can be used with Font::by_name, and index with Font::by_index.

Examples
use fltk::{prelude::*, *};
let app = app::App::default();
let font = app.load_font("font.ttf").unwrap();
let mut frame = frame::Frame::new(0, 0, 400, 100, "Hello");
frame.set_label_font(enums::Font::by_name(&font));
Errors

Returns ResourceNotFound if the Font file was not found

source

pub fn set_visual(self, mode: Mode) -> Result<(), FltkError>

Set the visual of the application

Errors

Returns FailedOperation if FLTK failed to set the visual mode

source

pub fn redraw(self)

Redraws the app

source

pub fn quit(self)

Quit the application

Examples found in repository?
examples/shapedwindow_taskbar.rs (line 75)
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fn main() {
    let app = app::App::default();

    // Act as the application in the taskbar (scroll to event handling)
    let mut dock_win = window::Window::default()
        .with_size(1, 1) // So we can place it at the center of the screen (needs a size >0 to be centered)
        .with_label("TestApplication")
        .center_screen();
    dock_win.size_range(0, 0, 0, 0);
    dock_win.make_resizable(false);

    dock_win.show();
    dock_win.end();

    let mut win = window::Window::default()
        .with_size(900, 500)
        .with_label("TestApplication")
        .center_screen();
    win.set_color(enums::Color::from_rgb(26, 25, 55));

    let mut but = button::Button::default()
        .with_label("Button")
        .with_size(80, 80)
        .center_of_parent();
    but.set_frame(enums::FrameType::OFlatFrame);
    but.set_color(enums::Color::Cyan);
    but.clear_visible_focus();
    but.set_callback(|_| println!("Clicked"));

    win.show();
    win.end();

    let win_shape = prep_shape(win.w(), win.h());

    // Called after showing window
    win.set_shape(Some(win_shape));

    win.handle({
        let mut x = 0;
        let mut y = 0;
        let mut dock_win = dock_win.clone();
        move |wself, event| match event {
            enums::Event::Push => {
                let coords = app::event_coords();
                x = coords.0;
                y = coords.1;

                true
            }
            enums::Event::Drag => {
                wself.set_pos(app::event_x_root() - x, app::event_y_root() - y);

                // Changing dock window position so it's close enough to the center of the application (not "visible" to user)
                dock_win.set_pos(wself.x() + (wself.w() / 2), wself.y() + (wself.w() / 2));

                true
            }
            enums::Event::Close => {
                app.quit();

                true
            }
            enums::Event::Hide => {
                app.quit();

                true
            }
            _ => false,
        }
    });

    // Make main window appear when "opened" via Alt+Tab or Taskbar
    dock_win.handle({
        let mut win = win.clone();
        move |_wself, event| match event {
            enums::Event::Focus => {
                let win_shape = prep_shape(win.w(), win.h());

                win.show();
                win.set_shape(Some(win_shape));

                true
            }
            enums::Event::Hide => {
                win.hide();

                true
            }
            enums::Event::Close => {
                app.quit();

                true
            }
            _ => false,
        }
    });

    app.run().unwrap();
}
More examples
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examples/editor2.rs (line 420)
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    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."),
                }
            }
        }
    }

Trait Implementations§

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impl Clone for App

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fn clone(&self) -> App

Returns a copy of the value. Read more
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fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source. Read more
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impl Debug for App

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

Formats the value using the given formatter. Read more
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impl Default for App

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fn default() -> Self

Returns the “default value” for a type. Read more
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impl Copy for App

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impl RefUnwindSafe for App

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impl Send for App

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impl Sync for App

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impl Unpin for App

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impl UnwindSafe for App

Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> ToOwned for T
where T: Clone,

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type Owned = T

The resulting type after obtaining ownership.
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fn to_owned(&self) -> T

Creates owned data from borrowed data, usually by cloning. Read more
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fn clone_into(&self, target: &mut T)

Uses borrowed data to replace owned data, usually by cloning. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.