16_filechooser.py (Source)

#!/usr/bin/python
# -*- coding: utf-8 -*-

import os
import sys

import gi
gi.require_version("Gtk", "3.0")
from gi.repository import Gtk, Gio, GdkPixbuf


class Handler:

    def on_window_destroy(self, window):
        window.close()

    def on_dialog_close(self, widget, *event):
        widget.hide_on_delete()
        return True

    def on_filechooser_dialog_response(self, widget, response):
        if response == -6:
            print("Cancel")
        elif response == -5:
            print("File selection: {}".format(widget.get_filename()))
        self.on_dialog_close(widget)

    def on_filechooser_dialog_file_activated(self, widget):
        self.on_filechooser_dialog_response(widget, -5)

    def on_filechooser_dialog_update_preview(self, widget):
        if widget.get_filename() != None and os.path.isfile(widget.get_filename()):
            pixbuf = GdkPixbuf.Pixbuf.new_from_file_at_scale(widget.get_filename(),
                                                             200,
                                                             200,
                                                             True,
                                                            )
            app.obj("preview").set_from_pixbuf(pixbuf)

    def on_file_button_clicked(self,widget):
        app.obj("filechooser_dialog").show_all()

    def on_dir_button_clicked(self,widget):
        dialog = Gtk.FileChooserDialog(title="Choose a folder",
                                       parent=app.obj("window"),
                                       action=Gtk.FileChooserAction.SELECT_FOLDER,
                                       )
        dialog.set_default_size(600, 300)
        dialog.add_buttons("Cancel", Gtk.ResponseType.CANCEL,
                           "OK", Gtk.ResponseType.OK)

        response = dialog.run()
        if response == Gtk.ResponseType.OK:
            print("Folder selection: {}".format(dialog.get_filename()))
        elif response == Gtk.ResponseType.CANCEL:
            print("Cancel")

        dialog.destroy()

class ExampleApp:

    def __init__(self):
        
        self.app = Gtk.Application.new("org.application.test", Gio.ApplicationFlags(0))
        self.app.connect("activate", self.on_app_activate)
        self.app.connect("shutdown", self.on_app_shutdown)

    def on_app_activate(self, app):
        builder = Gtk.Builder()
        builder.add_from_file("16_filechooser.glade")
        builder.connect_signals(Handler())

        self.obj = builder.get_object
        self.obj("window").set_application(app)
        self.obj("window").show_all()

        #add filters to filechooser dialog
        self.obj("filefilter").set_name("Image files")
        self.obj("filechooser_dialog").add_filter(self.obj("filefilter"))
        self.obj("png_filter").set_name("PNG files")
        self.obj("filechooser_dialog").add_filter(self.obj("png_filter"))
        self.obj("jpg_filter").set_name("JPG files")
        self.obj("filechooser_dialog").add_filter(self.obj("jpg_filter"))

        #add buttons to headerbar of Glade generated dialog
        button = Gtk.Button.new_with_label("Cancel")
        button.set_property("can-default", True)
        self.obj("filechooser_dialog").add_action_widget(button, Gtk.ResponseType.CANCEL)
        button = Gtk.Button.new_with_label("OK")
        button.set_property("can-default", True)
        self.obj("filechooser_dialog").add_action_widget(button, Gtk.ResponseType.OK)

    def on_app_shutdown(self, app):
        self.app.quit()

    def run(self, argv):
        self.app.run(argv)


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