Python GTK 3+：如何在组合框小部件中居中文本？

Question

所以我有一个组合框，我想将内部文本居中（现在它都被推到了左边）。但是，我似乎无法找到执行此操作的函数，也无法通过 CSS 触及它。有什么建议吗？谢谢。

Answer 1

我采用了流行的 Gtk Combobox 示例并对其进行了修改以显示如何将文本居中：

import gi

gi.require_version('Gtk', '3.0')

from gi.repository import Gtk

class ComboBoxWindow(Gtk.Window):

    def __init__(self):

        Gtk.Window.__init__(self, title="ComboBox Example")

        self.set_border_width(10)

        name_store = Gtk.ListStore(int, str)

        name_store.append([1, "Billy Bob"])

        name_store.append([11, "Billy Bob Junior"])

        name_store.append([12, "Sue Bob"])

        name_store.append([2, "Joey Jojo"])

        name_store.append([3, "Rob McRoberts"])

        name_store.append([31, "Xavier McRoberts"])

        vbox = Gtk.Box(orientation=Gtk.Orientation.VERTICAL, spacing=6)

        name_combo = Gtk.ComboBox.new_with_model_and_entry(name_store)

        name_combo.connect("changed", self.on_name_combo_changed)

        name_combo.set_entry_text_column(1)

        vbox.pack_start(name_combo, False, False, 0)

        country_store = Gtk.ListStore(str)

        countries = ["Austria", "Brazil", "Belgium", "France", "Germany",

        "Switzerland", "United Kingdom", "United States of America",

        "Uruguay"]

        for country in countries:

            country_store.append([country])

        country_combo = Gtk.ComboBox.new_with_model(country_store)

        country_combo.connect("changed", self.on_country_combo_changed)

        renderer_text = Gtk.CellRendererText()

        renderer_text.set_property("xalign", 0.51) #less than 0.51 has no affect

        country_combo.pack_start(renderer_text, True)

        country_combo.add_attribute(renderer_text, "text", 0)

        vbox.pack_start(country_combo, False, False, True)

        currencies = ["Euro", "US Dollars", "British Pound", "Japanese Yen",

        "Russian Ruble", "Mexican peso", "Swiss franc"]

        currency_combo = Gtk.ComboBoxText()

        currency_combo.set_entry_text_column(0)

        currency_combo.connect("changed", self.on_currency_combo_changed)

        for currency in currencies:

            currency_combo.append_text(currency)

        vbox.pack_start(currency_combo, False, False, 0)

        self.add(vbox)

    def on_name_combo_changed(self, combo):

        tree_iter = combo.get_active_iter()

        if tree_iter is not None:

            model = combo.get_model()

            row_id, name = model[tree_iter][:2]

            print("Selected: ID=%d, name=%s" % (row_id, name))

        else:

            entry = combo.get_child()

            print("Entered: %s" % entry.get_text())

    def on_country_combo_changed(self, combo):

        tree_iter = combo.get_active_iter()

        if tree_iter is not None:

            model = combo.get_model()

            country = model[tree_iter][0]

            print("Selected: country=%s" % country)

    def on_currency_combo_changed(self, combo):

        text = combo.get_active_text()

        if text is not None:

            print("Selected: currency=%s" % text)

win = ComboBoxWindow()

win.connect("destroy", Gtk.main_quit)

win.show_all()

Gtk.main()