使用python和GObject在林间空地添加组合框

Question

我正在尝试将组合框应用到一个小的GTK3接口,但我无法弄清楚如何填充它的列表,以及如何将接口的组合框与我的python代码连接起来.

有人能告诉我一个小例子吗？其余部分我将能够完成.

Answer 1

ComboBox,如TextViews或TreeViews,是一个小部件,可以清楚地将View(它看起来像什么)与模型分开(它们拥有什么信息).你需要在Glade做:

1. 将Combobox添加到GUI中的某个位置.
2. 创建一个将保存数据的ListStore.将Liststore配置为您需要的任何列(每列都有一个类型).
3. 返回组合框,将之前创建的Liststore设置为模型.
4. 编辑组合框(右键单击,编辑)并添加单元格渲染器.映射单元格渲染器以显示模型某些列的数据.
5. 如果您的数据是静态的,那么您可以在Glade中向ListStore添加行.如果您的数据是动态的,则需要在代码中获取liststore,然后使用与liststore具有相同类型元素的列表填充它.

我能想到的一个较小的例子就是这个:

test.glade

<?xml version="1.0" encoding="UTF-8"?>
<interface>
  <!-- interface-requires gtk+ 3.0 -->
  <object class="GtkListStore" id="myliststore">
    <columns>
      <!-- column-name code -->
      <column type="gchararray"/>
      <!-- column-name legible -->
      <column type="gchararray"/>
    </columns>
  </object>
  <object class="GtkWindow" id="window">
    <property name="can_focus">False</property>
    <property name="window_position">center-always</property>
    <property name="default_width">400</property>
    <signal name="destroy" handler="main_quit" swapped="no"/>
    <child>
      <object class="GtkBox" id="box">
        <property name="visible">True</property>
        <property name="can_focus">False</property>
        <child>
          <object class="GtkLabel" id="label">
            <property name="visible">True</property>
            <property name="can_focus">False</property>
            <property name="label" translatable="yes">Best color in the world:</property>
          </object>
          <packing>
            <property name="expand">True</property>
            <property name="fill">True</property>
            <property name="position">0</property>
          </packing>
        </child>
        <child>
          <object class="GtkComboBox" id="mycombobox">
            <property name="visible">True</property>
            <property name="can_focus">False</property>
            <property name="model">myliststore</property>
            <signal name="changed" handler="combobox_changed" swapped="no"/>
            <child>
              <object class="GtkCellRendererText" id="renderer"/>
              <attributes>
                <attribute name="text">1</attribute>
              </attributes>
            </child>
          </object>
          <packing>
            <property name="expand">True</property>
            <property name="fill">True</property>
            <property name="position">1</property>
          </packing>
        </child>
      </object>
    </child>
  </object>
</interface>

test.py

from gi.repository import Gtk
from os.path import abspath, dirname, join

WHERE_AM_I = abspath(dirname(__file__))

class MyApp(object):

    def __init__(self):
        # Build GUI
        self.builder = Gtk.Builder()
        self.glade_file = join(WHERE_AM_I, 'test.glade')
        self.builder.add_from_file(self.glade_file)

        # Get objects
        go = self.builder.get_object
        self.window = go('window')
        self.myliststore = go('myliststore')
        self.mycombobox = go('mycombobox')

        # Initialize interface
        colors = [
            ['#8C1700', 'Redish'],
            ['#008C24', 'Greenish'],
            ['#6B6BEE', 'Blueish'],

        ]
        for c in colors:
            self.myliststore.append(c)
        self.mycombobox.set_active(0)

        # Connect signals
        self.builder.connect_signals(self)

        # Everything is ready
        self.window.show()

    def main_quit(self, widget):
        Gtk.main_quit()

    def combobox_changed(self, widget, data=None):
        model = widget.get_model()
        active = widget.get_active()
        if active >= 0:
            code = model[active][0]
            print('The code of the selected color is {}'.format(code))
        else:
            print('No color selected')

if __name__ == '__main__':
    try:
        gui = MyApp()
        Gtk.main()
    except KeyboardInterrupt:
        pass

亲切的问候