drag_and_drop.rs

//! Simple drag and drop example
//!
//! Ported over from example code:
//! https://developer.gnome.org/gtkmm-tutorial/stable/sec-dnd-example.html.en

extern crate gdk;
extern crate gio;
extern crate gtk;

use gio::prelude::*;
use gtk::prelude::*;

use std::env::args;

fn build_ui(application: &gtk::Application) {
    // Configure button as drag source for text
    let button = gtk::Button::new_with_label("Drag here");
    let targets = vec![gtk::TargetEntry::new("STRING", gtk::TargetFlags::SAME_APP, 0),
                       gtk::TargetEntry::new("text/plain", gtk::TargetFlags::SAME_APP, 0)];
    button.drag_source_set(gdk::ModifierType::MODIFIER_MASK, &targets, gdk::DragAction::COPY);
    button.connect_drag_data_get(|_, _, s, _, _| {
        let data = "I'm data!";
        s.set_text(data);
    });

    // Configure label as drag destination to receive text
    let label = gtk::Label::new("Drop here");
    label.drag_dest_set(gtk::DestDefaults::ALL, &targets, gdk::DragAction::COPY);
    label.connect_drag_data_received(|w, _, _, _, s, _, _| {
        w.set_text(&s.get_text().expect("Couldn't get text"));
    });

    // Stack the button and label horizontally
    let hbox = gtk::Box::new(gtk::Orientation::Horizontal, 0);
    hbox.pack_start(&button, true, true, 0);
    hbox.pack_start(&label, true, true, 0);

    // Finish populating the window and display everything
    let window = gtk::ApplicationWindow::new(application);
    window.set_title("Simple Drag and Drop Example");
    window.set_default_size(200, 100);
    window.add(&hbox);
    window.show_all();

    // GTK & main window boilerplate
    window.connect_delete_event(move |win, _| {
        win.destroy();
        Inhibit(false)
    });
}

fn main() {
    let application = gtk::Application::new("com.github.drag_and_drop",
                                            gio::ApplicationFlags::empty())
                                       .expect("Initialization failed...");

    application.connect_startup(move |app| {
        build_ui(app);
    });
    application.connect_activate(|_| {});

    application.run(&args().collect::<Vec<_>>());
}