我正在用Python和Gtk3编写一个小应用程序。几乎所有东西都运行正常但有一点：我无法使用CSS更改我的按钮字体大小。我可以更改字体系列（arial，...）颜色，背景颜色，但字体大小似乎被忽略。 你有任何提示吗？
这是我的代码：
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()
和我的css：
.btn_moins {
background-color: orange;
background: orange;
color: white;
font-weight: bold;
font-size: 25;
padding: 0 20px 0 20px;
}
答案 0 :(得分：1)
我想帮助你，我想学习如何在PyGobject上使用css，但是你只发布了一小部分代码，它没用。
这里有一个字体示例：
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()
答案 1 :(得分：1)
screen = Gdk.Screen.get_default()
gtk_provider = Gtk.CssProvider()
gtk_context = Gtk.StyleContext()
gtk_context.add_provider_for_screen(screen, gtk_provider, Gtk.STYLE_PROVIDER_PRIORITY_APPLICATION)
#css = """#styled_button { font-weight: bold; font-size: 22; }""" #also valid
css = """#styled_button { font: bold 16}""" #bold is not necessary
gtk_provider.load_from_data(css)
button.set_name("styled_button")
从methode设置样式：
...
css = "GtkButton { font: 16}"
...
def on_button_clicked(self, widget, valid):
style_context = widget.get_style_context()
if valid:
style_context.add_class("bigger")
else:
style_context.remove_class("bigger")