尝试调用gtk-rs中的gtk主循环

Question

我试图用gtk 4-rs创建一个简单的窗口，我真的找不到关于如何调用主gtk循环的文档。

use gtk::prelude::*;

fn main() {
    // call gtk::init() to initialize gtk.
    if gtk::init().is_err() {
        println!("Failed to initialize GTK.");
        return;
    }
    let win = gtk::Window::new();
    let lab = gtk::Label::new(Some("Type something"));
    let text_area = gtk::Entry::new();
    
    // create a grid to hold the widgets
    let grid = gtk::Grid::new();
    grid.set_column_spacing(10);
    grid.set_row_spacing(10);
    grid.attach(&lab, 0, 0, 1, 1);
    grid.attach(&text_area, 1, 0, 1, 1);
    
    win.set_child(Some(&grid));
    
    win.show();
}

Answer 1

您缺少了GTK的Application，它自动初始化GTK并创建一个事件循环：

use gtk::prelude::*;

fn main() {
    let application =
        gtk::Application::new(Some("application-id"), Default::default());
    application.connect_activate(build_ui);
    application.run();
}

fn build_ui(app: &gtk::Application) {
    let win = gtk::ApplicationWindow::new(app);
    let lab = gtk::Label::new(Some("Type something"));
    let text_area = gtk::Entry::new();
    
    // create a grid to hold the widgets
    let grid = gtk::Grid::new();
    grid.set_column_spacing(10);
    grid.set_row_spacing(10);
    grid.attach(&lab, 0, 0, 1, 1);
    grid.attach(&text_area, 1, 0, 1, 1);
    
    win.set_child(Some(&grid));
    
    win.show();
}

gtk-s的书有更多关于这方面的信息。