Question

我一直在查看以下example关于如何设置ComboBox的样式，但是在进入可编辑的组合框时我无法创建焦点效果。每当ComboBox获得焦点时，它应进入编辑模式，组件应具有焦点样式。

基本问题是每当我进入编辑模式时，实际上没有焦点的周围ComboBox，但文本子组件和我无法创建Trigger修改ComboBox边框样式的文本组件，因为我不知道如何从触发器引用父组件。

我尝试在ControlTemplate或样式触发器上添加Trigger TextBox。我试图通过名称或使用ComboBox选项来引用TemplateBinding，但没有任何运气。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Gotfocus中设置组合框的边框画笔，使其在失去焦点时变得透明：

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;
    }

如何将焦点样式添加到WPF中的可编辑ComboBox

3 个答案: