增加侧边栏

作为另一个实用的功能，我们增加一个显示GtkMenuButton,GtkRevealer和GtkListBox的侧边条。

<?xml version="1.0" encoding="UTF-8"?>
<interface>
  <!-- interface-requires gtk+ 3.8 -->
  <template class="ExampleAppWindow" parent="GtkApplicationWindow">
    <property name="title" translatable="yes">Example Application</property>
    <property name="default-width">600</property>
    <property name="default-height">400</property>
    <child>
      <object class="GtkBox" id="content_box">
        <property name="visible">True</property>
        <property name="orientation">vertical</property>
        <child>
          <object class="GtkHeaderBar" id="header">
            <property name="visible">True</property>
            <child type="title">
              <object class="GtkStackSwitcher" id="tabs">
                <property name="visible">True</property>
                <property name="margin">6</property>
                <property name="stack">stack</property>
              </object>
            </child>
            <child>
              <object class="GtkToggleButton" id="search">
                <property name="visible">True</property>
                <property name="sensitive">False</property>
                <style>
                  <class name="image-button"/>
                </style>
                <child>
                  <object class="GtkImage" id="search-icon">
                    <property name="visible">True</property>
                    <property name="icon-name">edit-find-symbolic</property>
                    <property name="icon-size">1</property>
                  </object>
                </child>
              </object>
              <packing>
                <property name="pack-type">end</property>
              </packing>
            </child>
            <child>
              <object class="GtkMenuButton" id="gears">
                <property name="visible">True</property>
                <property name="direction">none</property>
                <property name="use-popover">True</property>
                <style>
                  <class name="image-button"/>
                </style>
              </object>
              <packing>
                <property name="pack-type">end</property>
              </packing>
            </child>
          </object>
        </child>
        <child>
          <object class="GtkSearchBar" id="searchbar">
            <property name="visible">True</property>
            <child>
              <object class="GtkSearchEntry" id="searchentry">
                <signal name="search-changed" handler="search_text_changed"/>
                <property name="visible">True</property>
              </object>
            </child>
          </object>
        </child>
        <child>
          <object class="GtkBox" id="hbox">
            <property name="visible">True</property>
            <child>
              <object class="GtkRevealer" id="sidebar">
                <property name="visible">True</property>
                <property name="transition-type">slide-right</property>
                <child>
                 <object class="GtkScrolledWindow" id="sidebar-sw">
                   <property name="visible">True</property>
                   <property name="hscrollbar-policy">never</property>
                   <property name="vscrollbar-policy">automatic</property>
                   <child>
                     <object class="GtkListBox" id="words">
                       <property name="visible">True</property>
                       <property name="selection-mode">none</property>
                     </object>
                   </child>
                 </object>
                </child>
              </object>
            </child>
            <child>
              <object class="GtkStack" id="stack">
                <signal name="notify::visible-child" handler="visible_child_changed"/>
                <property name="visible">True</property>
              </object>
            </child>
          </object>
        </child>
      </object>
    </child>
  </template>
</interface>

这些代码将每个文件中相关的词做成按钮显示在侧边条上。但我们将考虑用这些代码去添加一个工具菜单。

像我们所希望的，这个工具菜单在一个GtkBuilder ui file中被指定。

<?xml version="1.0"?>
<interface>
  <!-- interface-requires gtk+ 3.0 -->
  <menu id="menu">
    <section>
      <item>
        <attribute name="label" translatable="yes">_Words</attribute>
        <attribute name="action">win.show-words</attribute>
      </item>
    </section>
  </menu>
</interface>

为了连接菜单项和show-words设置，我们用了GAction对应于给定的GSettings。

...

static void
example_app_window_init (ExampleAppWindow *win)
{

...

  builder = gtk_builder_new_from_resource ("/org/gtk/exampleapp/gears-menu.ui");
  menu = G_MENU_MODEL (gtk_builder_get_object (builder, "menu"));
  gtk_menu_button_set_menu_model (GTK_MENU_BUTTON (priv->gears), menu);
  g_object_unref (builder);

  action = g_settings_create_action (priv->settings, "show-words");
  g_action_map_add_action (G_ACTION_MAP (win), action);
  g_object_unref (action);
}

...

(full source)

我们的应用程序如今是这样的：