How the Gtk3 button sets the font size… here is a solution to the problem.
How the Gtk3 button sets the font size
I’m writing a small app in Python and Gtk3. Almost everything works fine, but one thing: I can’t change my button font size using CSS. I can change the font family (arial,…) Color, background color, but font size seems to be ignored.
Do you have any suggestions?
Here is my code :
from gi.repository import Gtk, Gdk
class Monelio:
def __init__(self):
# load CSS
style_provider = Gtk.CssProvider()
css = open('monelio.css')
css_data = css.read()
css.close()
style_provider.load_from_data(css_data)
Gtk.StyleContext.add_provider_for_screen(
Gdk.Screen.get_default(),
style_provider,
Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION
)
# load CSS
style_provider = Gtk.CssProvider()
css = open('monelio.css')
css_data = css.read()
css.close()
style_provider.load_from_data(css_data)
Gtk.StyleContext.add_provider_for_screen(
Gdk.Screen.get_default(),
style_provider,
Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION
)
button1 = Gtk.Button()
button1.set_label(" - ")
button1.set_name("btn_moins_" + str(x+1))
button1.set_size_request(80, 70)
button1.get_style_context().add_class("btn_moins")
button1.connect("clicked", self.on_btn_moins_clicked)
button1.show()
and my CSS:
.btn_moins {
background-color: orange;
background: orange;
color: white;
font-weight: bold;
font-size: 25;
padding: 0 20px 0 20px;
}
Solution
I want to help you,
I want to learn how to use css on PyGobject, but you only posted a small part of the code and it didn’t work.
Here’s an example of a font:
from gi.repository import Gtk
class LabelWindow(Gtk.Window):
def __init__(self):
Gtk.Window.__init__(self, title="Label Example")
hbox = Gtk.Box(spacing=10)
hbox.set_homogeneous(False)
vbox_left = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=10)
vbox_left.set_homogeneous(False)
vbox_right = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=10)
vbox_right.set_homogeneous(False)
hbox.pack_start(vbox_left, True, True, 0)
hbox.pack_start(vbox_right, True, True, 0)
label = Gtk.Label("This is a normal label")
vbox_left.pack_start(label, True, True, 0)
label = Gtk.Label()
label.set_text("This is a left-justified label.\nWith multiple lines.")
label.set_justify(Gtk.Justification.LEFT)
vbox_left.pack_start(label, True, True, 0)
label = Gtk.Label(
"This is a right-justified label.\nWith multiple lines.")
label.set_justify(Gtk.Justification.RIGHT)
vbox_left.pack_start(label, True, True, 0)
label = Gtk.Label("This is an example of a line-wrapped label. It "
"should not be taking up the entire "
"width allocated to it, but automatically "
"wraps the words to fit.\n"
" It supports multiple paragraphs correctly, "
"and correctly adds "
"many extra spaces. ")
label.set_line_wrap(True)
vbox_right.pack_start(label, True, True, 0)
label = Gtk.Label("This is an example of a line-wrapped, filled label. "
"It should be taking "
"up the entire width allocated to it. "
"Here is a sentence to prove "
"my point. Here is another sentence. "
"Here comes the sun, do de do de do.\n"
" This is a new paragraph.\n"
" This is another newer, longer, better "
"paragraph. It is coming to an end, "
"unfortunately.")
label.set_line_wrap(True)
label.set_justify(Gtk.Justification.FILL)
vbox_right.pack_start(label, True, True, 0)
label = Gtk.Label()
label.set_markup("Text can be <small>small</small>, <big>big</big>, "
"<b>bold</b>, <i>italic</i> and even point to "
"somewhere in the <a href=\"http://www.gtk.org\" "
"title=\"Click to find out more\">internets</a>.")
label.set_line_wrap(True)
vbox_left.pack_start(label, True, True, 0)
label = Gtk.Label.new_with_mnemonic(
"_Press Alt + P to select button to the right")
vbox_left.pack_start(label, True, True, 0)
label.set_selectable(True)
button = Gtk.Button(label="Click at your own risk")
label.set_mnemonic_widget(button)
vbox_right.pack_start(button, True, True, 0)
self.add(hbox)
window = LabelWindow()
window.connect("delete-event", Gtk.main_quit)
window.show_all()
Gtk.main()