python - gtk-builder-错误-夸克 : invalid object type 'WebKitWebView'

Question

尝试通过 Gtk.builder() 获取 WebKitWebView 对象时，出现以下错误:

$ python3 test.py
Traceback (most recent call last):
  File "test.py", line 11, in <module>
    builder.add_from_file("ui.glade")
gi.repository.GLib.Error: gtk-builder-error-quark: ui.glade:31:1 Invalid object type 'WebKitWebView' (6)

这是我的 Python 代码

#!/usr/bin/env python

import gi
gi.require_version('WebKit2', '4.0')
gi.require_version('Gtk', '3.0')

from gi.repository import Gtk
from gi.repository import WebKit2 as Webkit

builder = Gtk.Builder()
builder.add_from_file("ui.glade")

window = builder.get_object("window")
window.set_title("Test")

webview = builder.get_object("webview")

if __name__ == "__main__": 
  window.show_all()
  Gtk.main()

这是我的 ui.glade 文件:

<?xml version="1.0" encoding="UTF-8"?>
<!-- Generated with glade 3.22.1 -->
<interface>
  <requires lib="gtk+" version="3.20"/>
  <requires lib="webkit2gtk" version="2.12"/>
  <object class="GtkWindow" id="window">
    <property name="width_request">800</property>
    <property name="height_request">600</property>
    <property name="can_focus">False</property>
    <child>
      <placeholder/>
    </child>
    <child>
      <object class="GtkBox">
        <property name="visible">True</property>
        <property name="can_focus">False</property>
        <property name="orientation">vertical</property>
        <child>
          <object class="GtkEntry">
            <property name="visible">True</property>
            <property name="can_focus">True</property>
          </object>
          <packing>
            <property name="expand">False</property>
            <property name="fill">True</property>
            <property name="position">0</property>
          </packing>
        </child>
        <child>
          <object class="WebKitWebView" id="webview">
            <property name="visible">True</property>
            <property name="can_focus">True</property>
            <child>
              <placeholder/>
            </child>
          </object>
          <packing>
            <property name="expand">False</property>
            <property name="fill">True</property>
            <property name="position">1</property>
          </packing>
        </child>
      </object>
    </child>
  </object>
</interface>

有一个类似的问题here ，但老实说我并没有像答案所说的那样“明白重点”。

Answer 1

Question: gtk-builder-error-quark: invalid object type 'WebKitWebView'

这似乎是 Gtk.Builder 无法解决的范围和命名空间问题。

找到了这个简单的解决方案，将所需的类 WebKit2.WebView 和 WebKit2.Settings 引入模块命名空间。

Note: You don't have to change anything within Glade, place WebKit2 objects as usual.

更改导入来源

from gi.repository import WebKit2 as Webkit

至

from gi.repository.WebKit2 import WebView, Settings

<小时/>

如果您不想一一定义所使用的类，请考虑此根据请求解决方案。

import gi
gi.require_version('WebKit2', '4.0')
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk
from gi.repository import WebKit2 as Webkit


class GtkBuilder(Gtk.Builder):
    def do_get_type_from_name(self, type_name):
        """
        Looks up a type by name, using the virtual function that Gtk.Builder 
        has for that purpose.

        Parameters:  type_name (str) – type name to lookup
        Returns:     the GObject.GType found for type_name 
                       or GObject.TYPE_INVALID if no type was found
        Return type: GObject.GType

        """

        if type_name.startswith('WebKit'):
            getattr(Webkit, type_name[6:])

        r = Gtk.Builder.do_get_type_from_name(self, type_name)
        print('GtkBuilder: => {}\t{}'.format(type_name, r))
        return r

Output:

GtkBuilder: => WebKitSettings   <GType WebKitSettings (4168054944)>
GtkBuilder: => GtkWindow    <GType GtkWindow (4167639152)>
GtkBuilder: => GtkBox   <GType GtkBox (4167624432)>
GtkBuilder: => GtkEntry <GType GtkEntry (4168904384)>
GtkBuilder: => WebKitWebView    <GType WebKitWebView (4168054192)>

<小时/>

使用 Python 测试:3.5 - gi.__version__:3.22.0 - Glade 3.22.1