# Dialog (Python)

Marta Maria Casetti
mmcasetti@gmail.com 2012
Ein Popup-Fenster
Mario Blättermann
mario.blaettermann@gmail.com 2011, 2013, 2016, 2018, 2021

# Dialog

Ein Dialog mit dem Antwortsignal, das mit einer Callback-Funktion verbunden ist.

# Code, der zum Generieren dieses Beispiels verwendet wurde

from gi.repository import Gtk import sys

class MyWindow(Gtk.ApplicationWindow): # construct a window (the parent window)

def __init__(self, app): Gtk.Window.__init__(self, title="GNOME Button", application=app) self.set_default_size(250, 50)

# a button on the parent window button = Gtk.Button("Click me") # connect the signal "clicked" of the button with the function # on_button_click() button.connect("clicked", self.on_button_click) # add the button to the window self.add(button)

# callback function for the signal "clicked" of the button in the parent # window def on_button_click(self, widget): # create a Gtk.Dialog dialog = Gtk.Dialog() dialog.set_title("A Gtk+ Dialog") # The window defined in the constructor (self) is the parent of the dialog. # Furthermore, the dialog is on top of the parent window dialog.set_transient_for(self) # set modal true: no interaction with other windows of the application dialog.set_modal(True) # add a button to the dialog window dialog.add_button(button_text="OK", response_id=Gtk.ResponseType.OK) # connect the "response" signal (the button has been clicked) to the # function on_response() dialog.connect("response", self.on_response)

# get the content area of the dialog, add a label to it content_area = dialog.get_content_area() label = Gtk.Label("This demonstrates a dialog with a label") content_area.add(label) # show the dialog dialog.show_all()

def on_response(self, widget, response_id): print("response_id is", response_id) # destroy the widget (the dialog) when the function on_response() is called # (that is, when the button of the dialog has been clicked) widget.destroy()

class MyApplication(Gtk.Application):

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

def do_activate(self): win = MyWindow(self) win.show_all()

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

app = MyApplication() exit_status = app.run(sys.argv) sys.exit(exit_status)

# Nützliche Methoden für ein Dialog-Widget

In line 16 the signal `"clicked"` is connected to the callback function `on_button_click()` using `widget.connect(signal, callback function)`. See for a more detailed explanation.

Instead of `set_modal(True)` we could have `set_modal(False)` followed by `set_destroy_with_parent(True)` that would destroy the dialog window if the main window is closed.

`add_button(button_text="The Answer", response_id=42)`, where `42` is any integer, is an alternative to `add_button(button_text="text", response_id=Gtk.ResponseType.RESPONSE)`, where `RESPONSE` could be one of `OK, CANCEL, CLOSE, YES, NO, APPLY, HELP`, which in turn correspond to the integers `-5, -6,..., -11`.

# API-Referenzen

In diesem Beispiel haben wir Folgendes verwendet:

GtkDialog

GtkWindow