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3

Change font programmatically for GTK3 TextView (quickly-widgets TextEditor)

rated 0 times [ 3] [ 0] / answers: 1 / hits: 5065 / 2 Years ago, fri, august 19, 2022, 6:54:02

In an app using PyGI and GTK3, I'm trying to let the user set the font family and size in a TextView through my app's settings dialog. In PyGI the TextView object has "set" methods for several properties, but not for font properties. I can set the font family via CSS using a CSS style provider. But I can't change that CSS dynamically to respect the font selected by a user. So how can I do this? (Note that the widget in question is actually the TextEditor from the quickly-widgets package and I'm using Quickly to build the app.)

Edit to clarify: I'm not wedded to using CSS, that just seems to be GTK's preferred approach. What I'm hoping for is a method of some kind, like GtkTextView.setFontProperties() or something like that. I can't find anything like that for font properties.

Thanks,

Ian

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4 Years ago

answered 2 Years ago utschang · Accepted Answer

You can set the font in a textview using GTK+'s built-in button and dialog for this, Gtk.FontButton():

#!/usr/bin/python



from gi.repository import Gtk



class TextViewWindow:

    def __init__(self):

        self.window = Gtk.Window()

        self.window.set_default_size(400, 400)



        main_vbox = Gtk.VBox(homogeneous=False, spacing=0)

        self.window.add(main_vbox)



        self.tview = Gtk.ScrolledWindow()

        main_vbox.add(self.tview)



        self.textview = Gtk.TextView()

        self.textbuffer = self.textview.get_buffer()

        self.textbuffer.set_text("Here is a text view.")

        self.textview.set_wrap_mode(Gtk.WrapMode.WORD)



        self.tview.add(self.textview)



        self.font_button = Gtk.FontButton()

        self.font_button.connect('font-set', self.on_font_set)

        main_vbox.pack_start(self.font_button, False, False, 0)



        self.window.show_all()

        self.window.connect('destroy', lambda w: Gtk.main_quit())



    def on_font_set(self, widget):

        font_description = widget.get_font_desc()

        print "You chose: " + widget.get_font()

        self.textview.modify_font(font_description)



def main():

    app = TextViewWindow()

    Gtk.main()



if __name__ == "__main__":

    main()

My demo:

demo

Built-in dialog:

picker