如何禁用定义了页面标题的 GtkAssistant 侧边栏？

Question

我正在为定义页面标题时自动出现的 GtkAssistant 侧边栏而苦恼。

GtkAssistant 不接受窗口标题。您需要定义一个页面标题，但它会启用该侧栏。

我只想要页面标题。一个例子：

考虑到这个例子，我想保留“错误详细信息”标题但隐藏侧栏。这对我没用。并且没有 Gtk Doc 提到要删除它。不知道能不能。

林间空地示例：

<?xml version="1.0" encoding="UTF-8"?>
<!-- Generated with glade 3.22.1 -->
<interface>
  <requires lib="gtk+" version="3.2"/>
  <object class="GtkAssistant" id="assistant">
    <property name="can_focus">False</property>
    <property name="use_header_bar">0</property>
    <signal name="cancel" handler="on_destroy" swapped="no"/>
    <signal name="close" handler="on_destroy" swapped="no"/>
    <signal name="delete-event" handler="on_destroy" swapped="no"/>
    <child>
      <object class="GtkBox" id="page1">
        <property name="visible">True</property>
        <property name="can_focus">False</property>
        <property name="margin_left">7</property>
        <property name="margin_right">7</property>
        <property name="margin_top">7</property>
        <property name="margin_bottom">7</property>
        <property name="orientation">vertical</property>
        <child>
          <object class="GtkLabel">
            <property name="visible">True</property>
            <property name="can_focus">False</property>
            <property name="label" translatable="yes">Name:</property>
          </object>
          <packing>
            <property name="expand">False</property>
            <property name="fill">True</property>
            <property name="position">0</property>
          </packing>
        </child>
        <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">1</property>
          </packing>
        </child>
        <child>
          <object class="GtkLabel">
            <property name="visible">True</property>
            <property name="can_focus">False</property>
            <property name="label" translatable="yes">Surname:</property>
          </object>
          <packing>
            <property name="expand">False</property>
            <property name="fill">True</property>
            <property name="position">2</property>
          </packing>
        </child>
        <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">3</property>
          </packing>
        </child>
      </object>
      <packing>
        <property name="page_type">intro</property>
        <property name="title" translatable="yes">User Info</property>
        <property name="has_padding">False</property>
      </packing>
    </child>
    <child>
      <object class="GtkBox" id="page2">
        <property name="visible">True</property>
        <property name="can_focus">False</property>
        <property name="margin_left">7</property>
        <property name="margin_right">7</property>
        <property name="margin_top">7</property>
        <property name="margin_bottom">7</property>
        <property name="orientation">vertical</property>
        <child>
          <object class="GtkLabel">
            <property name="visible">True</property>
            <property name="can_focus">False</property>
            <property name="label" translatable="yes">Address:</property>
          </object>
          <packing>
            <property name="expand">False</property>
            <property name="fill">True</property>
            <property name="position">0</property>
          </packing>
        </child>
        <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">1</property>
          </packing>
        </child>
        <child>
          <object class="GtkLabel">
            <property name="visible">True</property>
            <property name="can_focus">False</property>
            <property name="label" translatable="yes">Telephone:</property>
          </object>
          <packing>
            <property name="expand">False</property>
            <property name="fill">True</property>
            <property name="position">2</property>
          </packing>
        </child>
        <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">3</property>
          </packing>
        </child>
      </object>
      <packing>
        <property name="title" translatable="yes">Extra Info</property>
        <property name="has_padding">False</property>
      </packing>
    </child>
    <child>
      <object class="GtkBox" id="page3">
        <property name="visible">True</property>
        <property name="can_focus">False</property>
        <property name="orientation">vertical</property>
        <child>
          <placeholder/>
        </child>
        <child>
          <object class="GtkLabel">
            <property name="visible">True</property>
            <property name="can_focus">False</property>
            <property name="label" translatable="yes">Thanks for registering!</property>
            <attributes>
              <attribute name="weight" value="bold"/>
              <attribute name="scale" value="1.5"/>
            </attributes>
          </object>
          <packing>
            <property name="expand">False</property>
            <property name="fill">True</property>
            <property name="position">1</property>
          </packing>
        </child>
        <child>
          <placeholder/>
        </child>
      </object>
      <packing>
        <property name="page_type">summary</property>
        <property name="title" translatable="yes">Success</property>
        <property name="has_padding">False</property>
      </packing>
    </child>
    <child>
      <placeholder/>
    </child>
    <child>
      <placeholder/>
    </child>
    <child>
      <placeholder/>
    </child>
    <child>
      <placeholder/>
    </child>
    <child>
      <placeholder/>
    </child>
    <child>
      <placeholder/>
    </child>
    <child>
      <placeholder/>
    </child>
  </object>
</interface>

结果是：

我想移除这个奇怪的侧边栏。

Answer 1

问题：如何禁用已定义页面标题的GtkAssistant 侧边栏？

使用您的glade.xml，我收到以下错误：

    (Assistant.py:4515): Gtk-CRITICAL **: gtk_assistant_set_page_has_padding: assertion 'child != NULL' failed  

和    Next    按钮保持insensitive。

已解决：使用assistant.set_page_complete(box, True) 启用   下一步    按钮。

---

但是，使用以下 API 参考我得到了这个结果：

PyGObject API Reference:

• Gtk.Assistant.signals.prepare
• Gtk.Assistant.set_page_complete
• Gtk.HeaderBar

缺点：
操作系统将Gtk.Assistant. 窗口标题视为undefined!
使用GtkAssistant.set_title(... 没有结果！

---

首先使用Glade 在GtkAssistant 中添加signal "prepare"。

<signal name="prepare" handler="on_assistant_prepare" swapped="no"/>

用法：

import gi
gi.require_version('Gtk', '3.0')
from gi.repository import Gtk


class GtkAssistant:
    def __init__(self):
        self.builder = Gtk.Builder()
        self.builder.add_from_file(__file__.replace('.py', '.glade'))
        self.builder.connect_signals(self)

        assistant = self.builder.get_object("assistant")

        # Preserve the page titels from glade
        # Set page titles to empty '' to force not to show sidebar
        for _id in ["page1", "page2", "page3"]:
            box = self.builder.get_object(_id)
            box.page_title = assistant.get_page_title(box)
            assistant.set_page_title(box, '')

        # Gtk.Assistant refuses to do .set_title even defined in glade
        # <property name="title" translatable="yes">Registration-Assistant</property>
        assistant.set_title('Registration-Assistant')

        # Replace assistant.set_page_title(... with own function
        assistant.set_page_title = self.set_page_title

        # Replace the window decoration with a custom HeaderBar
        self.title = Gtk.Label()
        headerbar = Gtk.HeaderBar()
        headerbar.set_show_close_button(True)
        headerbar.set_custom_title(self.title)
        assistant.set_titlebar(headerbar)

        assistant.show_all()

    def set_page_title(self, box, title):
        self.title.set_text(title)

    def on_assistant_prepare(self, assistant, box, user_data=None):
        assistant.set_page_title(box, box.page_title)
        # This will make update the buttons state 
        # to be able to continue the task.
        assistant.set_page_complete(box, True)

    def on_destroy(self, widget, data=None):
        Gtk.main_quit()

if __name__ == '__main__':
    assist = GtkAssistant()
    Gtk.main()

使用 Python 测试：3.5 - gi.__version__：3.22.0 - Glade 3.20.0