文本框如何在ErrorTemplate上方显示内容？

问题描述

我正在尝试在拖放过程中为放置目标制作一个装饰器，并且我正在创建TemplatedAdorner和AdornedElementPlaceholder类的自定义版本，以便这样做。我得到它的工作，除了我不能让装饰的
元素的内容显示在装饰者的背景前面，就像我可以使用TextBoxes ErrorTemplate。这是否意味着文本框中的文本实际上是在具有比验证装饰器更高的z顺序的装饰器中呈现的？

I am trying to make an adorner for drop targets during drag drop, and am creating custom versions of the TemplatedAdorner and AdornedElementPlaceholder classes in order to do so. I am getting it to work with the exception that I cannot get the adorned element's content to display in front of the adorner's background, like I can do with the TextBoxes ErrorTemplate. Does this mean that the text in a textbox is actually rendered in an adorner that has a higher z-order than the validation adorner?

推荐答案

是否要在errortemplate中显示错误消息，并提醒用户输入正确的值？如果是，请查看textBox的以下样式。

Do you want to display error message in errortemplate, and remind user to enter the correct value? If yes, please take a look the following style for textBox.

  <Window.Resources>
        <Style TargetType="{x:Type TextBox}">
            <Setter Property="Validation.ErrorTemplate">
                <Setter.Value>
                    <ControlTemplate>
                        <Grid>
                            <Border
                                x:Name="errorBorder"
                                Background="#11FF0000"
                                BorderBrush="#FFCB2E2E"
                                BorderThickness="1"
                                IsHitTestVisible="False" />
                            <AdornedElementPlaceholder x:Name="placeholder" />
                            <Popup
                                HorizontalAlignment="Right"
                                AllowsTransparency="True"
                                HorizontalOffset="0"
                                IsOpen="{Binding ElementName=placeholder, Path=AdornedElement.IsFocused, Mode=OneWay}"
                                Placement="Right"
                                PlacementTarget="{Binding ElementName=errorBorder}"
                                PopupAnimation="Fade"
                                VerticalOffset="0">
                                <StackPanel Orientation="Horizontal">
                                    <Polygon
                                        VerticalAlignment="Center"
                                        Fill="#FFCB2E2E"
                                        Points="0,4 4,0 4,8"
                                        Stretch="Fill"
                                        Stroke="#FFCB2E2E"
                                        StrokeThickness="2" />
                                    <Border
                                        Padding="4"
                                        Background="#FFCB2E2E"
                                        CornerRadius="4">
                                        <TextBlock
                                            Margin="2,0,0,0"
                                            HorizontalAlignment="Center"
                                            FontWeight="Bold"
                                            Foreground="White"
                                            Text="{Binding ElementName=placeholder, Path=AdornedElement.ToolTip, Mode=OneWay}" />
                                    </Border>
                                </StackPanel>
                            </Popup>
                        </Grid>
                    </ControlTemplate>
                </Setter.Value>
            </Setter>
            <Style.Triggers>
                <Trigger Property="Validation.HasError" Value="True">
                    <Setter Property="ToolTip" Value="{Binding RelativeSource={RelativeSource Self}, Path=(Validation.Errors)[0].ErrorContent}" />
                </Trigger>
            </Style.Triggers>
        </Style>
    </Window.Resources>
    <Grid>
        <TextBox
            Name="textBox1"
            Width="50"
            Height="30">
            <TextBox.Text>
                <Binding Path="Age" UpdateSourceTrigger="PropertyChanged">
                    <Binding.ValidationRules>
                        <local:AgeRangeRule Max="80" Min="20" />
                    </Binding.ValidationRules>
                </Binding>
            </TextBox.Text>
        </TextBox>

    </Grid>

.cs：

  public partial class Window1 : Window
    {
        private MyDataSource ods { get; set; }
        public Window1()
        {
            InitializeComponent();
            ods = new MyDataSource();
            ods.Age = 100;
            this.DataContext = ods;

        }
    }
    public class AgeRangeRule : ValidationRule
    {
        private int _min;
        private int _max;

        public AgeRangeRule()
        {
        }
        public int Min
        {
            get { return _min; }
            set { _min = value; }
        }
        public int Max
        {
            get { return _max; }
            set { _max = value; }
        }

        public override ValidationResult Validate(object value, CultureInfo cultureInfo)
        {
            double enteredValue;
            if (double.TryParse(value.ToString(), out enteredValue))
            {
                if ((enteredValue < Min) || (enteredValue > Max))
                {
                    return new ValidationResult(false,
                      string.Format("Entered value must be in the range [{0};{1}].",
                      Min, Max));
                }
            }
            else
            {
                return new ValidationResult(false,
                    string.Format("Value '{0}' is not of type double.", value));
            }
            return new ValidationResult(true, null);
        }
    }
    public class MyDataSource: Test3.ViewModelBase
{
        private int _age;
        public MyDataSource()
        {
            Age = 0;
        }
        public int Age
        {
            get { return _age; }
            set {
                _age = value;
                RaisePropertyChanged("Age");
            }
        }
    }

最好的问候，

Cherry

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