如何向 WPF 中的可编辑组合框添加焦点样式

Question

我一直在查看以下关于如何设置 ComboBox 样式的示例，但在进入可编辑组合框时我无法创建焦点效果。每当 ComboBox 接收焦点时，它应该进入编辑模式，并且组件应该具有焦点样式。

基本问题是，每当我进入编辑模式时，实际上具有焦点的不是周围的 ComboBox，而是文本子组件，而我无法创建 Trigger< /code> 在文本组件上，它修改了 ComboBox 的边框样式，因为我不知道如何从触发器引用父组件。

我尝试在 TextBox 或样式触发器上添加 ControlTemplate Trigger 。我尝试通过名称或使用 TemplateBinding 选项来引用 ComboBox，但没有成功。一个简单的例子将非常感激。

Answer 1

将 IsKeyboardFocusWithin 绑定到 IsDropDownOpen

<ComboBox ItemsSource="{Binding SortedItems}"
          StaysOpenOnEdit="True"
          IsDropDownOpen="{Binding IsKeyboardFocusWithin, RelativeSource={RelativeSource Self}, Mode=OneWay}" />

Answer 2

  private void cmbSpecialHandling_GotFocus(object sender, RoutedEventArgs e)
        {
            Thickness th = new Thickness(2);
            cmbSpecialHandling.BorderThickness = th;
            cmbSpecialHandling.BorderBrush = this.FindResource("TabFocusColor") as SolidColorBrush;
        }

        private void cmbSpecialHandling_GotKeyboardFocus(object sender, KeyboardFocusChangedEventArgs e)
        {
            Thickness th = new Thickness(2);
            cmbSpecialHandling.BorderThickness = th;
            cmbSpecialHandling.BorderBrush = this.FindResource("TabFocusColor") as SolidColorBrush;
        }

        private void cmbSpecialHandling_LostFocus(object sender, RoutedEventArgs e)
        {
            cmbSpecialHandling.BorderBrush = Brushes.Transparent;
        }

Answer 3

在其 Gotfocus 中设置组合框的边框画笔，并使其在失去焦点时透明：

private void comboBox_GotFocus(object sender, RoutedEventArgs e)
    {
        Thickness th = new Thickness(2);
        comboBox.BorderThickness = th;
        comboBox.BorderBrush = this.FindResource("TabFocusColor") as SolidColorBrush;
                  or
     comboBox.BorderBrush = Brushes.Green;
    }


    private void comboBox_LostFocus(object sender, RoutedEventArgs e)
    {
        comboBox.BorderBrush = Brushes.Transparent;
    }