MainWindow.py

# -*- coding: utf-8 -*-
"""Python - GTK - PyGObject."""

import gi

gi.require_version(namespace='Gtk', version='4.0')
gi.require_version(namespace='Adw', version='1')

from gi.repository import Adw, Gdk, Gio, GObject, Gtk

Adw.init()


class DropArea(Gtk.Label):
    def __init__(self):
        super().__init__()

        self.set_label(str='Drag and drop the file here (class DropArea)')
        drag_source = Gtk.DragSource.new()
        drag_source.set_actions(Gdk.DragAction.COPY)
        drag_source.connect('prepare', self.on_prepare)
        drag_source.connect('drag-begin', self.on_drag_begin)
        drag_source.connect('drag-end', self.on_drag_end)
        drag_source.connect('drag-cancel', self.on_drag_cancel)

        drop_target = Gtk.DropTarget.new(
            GObject.TYPE_STRING, Gdk.DragAction.COPY
        )
        drop_target.connect('drop', self.on_drop)

        self.add_controller(drag_source)
        self.add_controller(drop_target)

    def on_prepare(self, DropTarget, x, y):
        print('[!] drag_source (prepare) [!]')
        print(f'Widget = {DropTarget}')
        print(f'Position on the x-axis = {x}')
        print(f'Position on the y-axis = {y}')

    def on_drag_begin(self):
        print('[!] drag_source (drag_begin) [!]')

    def on_drag_end(self):
        print('[!] drag_source (drag_end) [!]')

    def on_drag_cancel(self):
        print('[!] drag_source (drag_cancel) [!]')

    def on_drop(self, DropTarget, data, x, y):
        print('[!] drop_target (drop) [!]')
        print(f'Widget = {DropTarget}')
        print(f'Data = {data}')
        print(f'Position on the x-axis = {x}')
        print(f'Position on the y-axis = {y}')


class ExampleWindow(Gtk.ApplicationWindow):
    def __init__(self, **kwargs):
        super().__init__(**kwargs)

        self.set_title(title='Python - PyGObject - GTK')
        self.set_default_size(width=int(1366 / 2), height=int(768 / 2))
        self.set_size_request(width=int(1366 / 3), height=int(768 / 3))

        header_bar = Gtk.HeaderBar.new()
        self.set_titlebar(titlebar=header_bar)

        menu_button_model = Gio.Menu()
        menu_button_model.append(
            label='Preferences',
            detailed_action='app.preferences',
        )

        menu_button = Gtk.MenuButton.new()
        menu_button.set_icon_name(icon_name='open-menu-symbolic')
        menu_button.set_menu_model(menu_model=menu_button_model)
        header_bar.pack_end(child=menu_button)

        vbox = Gtk.Box.new(orientation=Gtk.Orientation.VERTICAL, spacing=12)
        vbox.set_homogeneous(homogeneous=True)
        # No GTK 3: set_border_width().
        vbox.set_margin_top(margin=12)
        vbox.set_margin_end(margin=12)
        vbox.set_margin_bottom(margin=12)
        vbox.set_margin_start(margin=12)
        # Adicionando o box na janela principal.
        # No GTK 3: add().
        self.set_child(child=vbox)

        drag_source = Gtk.DragSource.new()
        drag_source.set_actions(Gdk.DragAction.COPY)
        drag_source.connect('prepare', self.on_prepare)
        drag_source.connect('drag-begin', self.on_drag_begin)
        drag_source.connect('drag-end', self.on_drag_end)
        drag_source.connect('drag-cancel', self.on_drag_cancel)

        drop_target = Gtk.DropTarget.new(
            GObject.TYPE_STRING, Gdk.DragAction.COPY
        )
        drop_target.connect('drop', self.on_drop)

        label = Gtk.Label.new('Drag and drop the file here.')
        label.add_controller(drag_source)
        label.add_controller(drop_target)
        vbox.append(child=label)

        # class DropArea(Gtk.Label).
        drop_area = DropArea()
        vbox.append(child=drop_area)

    def on_prepare(self, DropTarget, x, y):
        print('[!] drag_source (prepare) [!]')
        print(f'Widget = {DropTarget}')
        print(f'Position on the x-axis = {x}')
        print(f'Position on the y-axis = {y}')

    def on_drag_begin(self):
        print('[!] drag_source (drag_begin) [!]')

    def on_drag_end(self):
        print('[!] drag_source (drag_end) [!]')

    def on_drag_cancel(self):
        print('[!] drag_source (drag_cancel) [!]')

    def on_drop(self, DropTarget, data, x, y):
        print('[!] drop_target (drop) [!]')
        print(f'Widget = {DropTarget}')
        print(f'Data = {data}')
        print(f'Position on the x-axis = {x}')
        print(f'Position on the y-axis = {y}')


class ExampleApplication(Gtk.Application):
    def __init__(self):
        super().__init__(
            application_id='br.com.justcode.PyGObject',
            flags=Gio.ApplicationFlags.FLAGS_NONE,
        )

        self.create_action('quit', self.exit_app, ['<primary>q'])
        self.create_action('preferences', self.on_preferences_action)

    def do_activate(self):
        win = self.props.active_window
        if not win:
            win = ExampleWindow(application=self)
        win.present()

    def do_startup(self):
        Gtk.Application.do_startup(self)

    def do_shutdown(self):
        Gtk.Application.do_shutdown(self)

    def on_preferences_action(self, action, param):
        print('Action `app.preferences` was active.')

    def exit_app(self, action, param):
        self.quit()

    def create_action(self, name, callback, shortcuts=None):
        action = Gio.SimpleAction.new(name=name, parameter_type=None)
        action.connect('activate', callback)
        self.add_action(action=action)
        if shortcuts:
            self.set_accels_for_action(
                detailed_action_name=f'app.{name}',
                accels=shortcuts,
            )


if __name__ == '__main__':
    import sys

    app = ExampleApplication()
    app.run(sys.argv)