ProgressBar example

[Wanpaku]

Can you give me a ProgressBar example, please?
It's not clear for me how to set start or end of executing this widget.

[philippe06150]

Hi, not sure to understand what u mean by "... to set start or end ...", here is an working example, you just adjust value with "set-fraction", I just put a closure to change the value every second to have the ProgressBar living

use gtk::{glib, prelude::*};

fn main() -> glib::ExitCode {
    let application = gtk::Application::builder()
        .application_id("com.github.gtk-rs.examples.progressbar")
        .build();
    application.connect_activate(build_ui);
    application.run()
}

fn build_ui(application: &gtk::Application) {
    let window = gtk::ApplicationWindow::new(application);
    // set a progressbar, see reference in
    // https://gtk-rs.org/gtk4-rs/stable/latest/docs/gtk4/struct.ProgressBar.html
    let pb = gtk::ProgressBar::new();
    pb.set_show_text(true); // show % next to the bar
    //
    window.set_title(Some("ProgressBar demo"));
    window.set_default_size(350, 70);
    window.set_child(Some(&pb));
    window.present();
    //
    // closure to change progressbar value each 1 sec
    //
    let mut x = 0.0_f64;
    let mut delta: f64 = 0.1;
    let tick = move || {
        if x > 1.0 {delta = -0.1}
        if x < 0.0 {delta = 0.1}
        pb.set_fraction(x); // The fraction should be between 0.0 and 1.0
        x = x + delta ;
        glib::ControlFlow::Continue
    };
    // executes the closure once every second
    glib::timeout_add_seconds_local(1, tick);
}

[Wanpaku]

This how it looks in Qt(C++):

const int& path_to_dicts_count = paths_to_dicts.size();

    if (path_to_dicts_count > 0)
    {
        progress_dialog = new QProgressDialog(
            "", nullptr, 0, path_to_dicts_count);
        progress_dialog->setWindowModality(Qt::WindowModal);
        progress_dialog->setMinimumDuration(0);
        progress_dialog->setWindowTitle(tr("Download dictionaries..."));
    }

    int path_count {0};
    for (const auto& path: std::as_const(paths_to_dicts))
    {
        if (progress_dialog)
        {
            progress_dialog->setValue(path_count);
            const int& pos = path.length() - path.lastIndexOf("/") - 1;
            progress_dialog->setLabelText(path.right(pos));
        }

        const QDir& path_to_dict(path);
        if (path_to_dict.exists())
        {
            read_from_txt_file(path);
            path_count += 1;
        }
        else
        {
            const string& error_message =
                ("Can't find the path: " + path + "!").toStdString();
            progress_dialog->close();
            throw runtime_error(error_message);
        }
    }

    create_dict_indexes();

    if (progress_dialog)
    {
        progress_dialog->close();
    }

I have initial point at 0, end point at some value and I can forcedly close progress bar in Qt.
Needs gtk4 ProgressBar some command to close it forcedly?

[philippe06150]

Hi, do not know Qt, but seems in your code that you handle a dialog window and you close this window at the end; In GTK4-RS, ProgressBar is a widget, not a window, so you have to build your window around (adding Label, Button and whatever you want), and you close it when finished. As far as I know, there is no equivalent like the progress window that you show in Qt.