如何在文本框上显示气球提示？

Question

我有一个使用 XAML 和 MVVM 的 C# WPF 应用程序。我的问题是：如何在文本框上方显示用户输入的某些无效数据的气球工具提示？

我想为此使用 Microsoft 的本机气球控件。我如何将其实现到我的应用程序中？

Answer 1

只需添加对 System.Windows.Forms 和 C:\Program Files\Reference Assemblies\Microsoft\Framework.NETFramework 4.0\WindowsFormsIntegration.dll 的引用 然后：

    WindowsFormsHost host =new WindowsFormsHost();

    var toolTip1 = new System.Windows.Forms.ToolTip();

    toolTip1.AutoPopDelay = 5000;
    toolTip1.InitialDelay = 1000;
    toolTip1.ReshowDelay = 500;
    toolTip1.ShowAlways = true;
    toolTip1.IsBalloon = true;
    toolTip1.ToolTipIcon = System.Windows.Forms.ToolTipIcon.Info;
    toolTip1.ToolTipTitle = "Title:";

    System.Windows.Forms.TextBox tb = new System.Windows.Forms.TextBox();
    tb.Text="Go!";
    toolTip1.SetToolTip(tb, "My Info!");
    host.Child = tb;
    grid1.Children.Add(host);  //a container for windowsForm textBox 

这是 WPF 中 WinForm ToolTip Ballon 的示例：

希望这有帮助！

Answer 2

这个 BalloonDecorator 项目 是我在当前项目中使用的一个用于显示帮助提示和错误通知的项目。 我知道您可以修改错误模板来显示此装饰器，就像您可以显示图标而不是红色边框一样。 使用装饰器的好处是你可以让它看起来像你想要的那样，而不必依赖 WinForms。

BalloonDecorator.cs

using System;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Media;

namespace MyNamespace
{
public class BalloonDecorator : Decorator
{
    private static double _thickness = 0;
    private static int OpeningGap = 10;

    public static readonly DependencyProperty BackgroundProperty =
        DependencyProperty.Register("Background", typeof (Brush), typeof (BalloonDecorator));

    public static readonly DependencyProperty BorderBrushProperty =
        DependencyProperty.Register("BorderBrush", typeof (Brush), typeof (BalloonDecorator));

    public static readonly DependencyProperty PointerLengthProperty = 
        DependencyProperty.Register("PointerLength", typeof (double), typeof (BalloonDecorator),
        new FrameworkPropertyMetadata(10.0, FrameworkPropertyMetadataOptions.AffectsRender |
        FrameworkPropertyMetadataOptions.AffectsMeasure));

    public static readonly DependencyProperty CornerRadiusProperty = 
        DependencyProperty.Register("CornerRadius", typeof (double), typeof (BalloonDecorator),
        new FrameworkPropertyMetadata(10.0, FrameworkPropertyMetadataOptions.AffectsRender |
        FrameworkPropertyMetadataOptions.AffectsMeasure));

    public Brush Background
    {
        get { return (Brush) GetValue(BackgroundProperty); }
        set { SetValue(BackgroundProperty, value); }
    }

    public Brush BorderBrush
    {
        get { return (Brush) GetValue(BorderBrushProperty); }
        set { SetValue(BorderBrushProperty, value); }
    }

    public double PointerLength
    {
        get { return (double) GetValue(PointerLengthProperty); }
        set { SetValue(PointerLengthProperty, value); }
    }

    public double CornerRadius
    {
        get { return (double) GetValue(CornerRadiusProperty); }
        set { SetValue(CornerRadiusProperty, value); }
    }

    protected override Size ArrangeOverride(Size arrangeSize)
    {
        UIElement child = Child;
        if (child != null)
        {
            double pLength = PointerLength;
            Rect innerRect =
                Rect.Inflate(new Rect(pLength, 0, Math.Max(0, arrangeSize.Width - pLength), arrangeSize.Height),
                             -1 * _thickness, -1 * _thickness);
            child.Arrange(innerRect);
        }

        return arrangeSize;
    }

    protected override Size MeasureOverride(Size constraint)
    {
        UIElement child = Child;
        Size size = new Size();
        if (child != null)
        {
            Size innerSize = new Size(Math.Max(0, constraint.Width - PointerLength), constraint.Height);
            child.Measure(innerSize);
            size.Width += child.DesiredSize.Width;
            size.Height += child.DesiredSize.Height;
        }

        Size borderSize = new Size(2 * _thickness, 2 * _thickness);
        size.Width += borderSize.Width + PointerLength;
        size.Height += borderSize.Height;

        return size;
    }

    protected override void OnRender(DrawingContext dc)
    {
        Rect rect = new Rect(0, 0, RenderSize.Width, RenderSize.Height);

        dc.PushClip(new RectangleGeometry(rect));
        dc.DrawGeometry(Background, new Pen(BorderBrush, _thickness), CreateBalloonGeometry(rect));
        dc.Pop();
    }

    private StreamGeometry CreateBalloonGeometry(Rect rect)
    {
        double radius = Math.Min(CornerRadius, rect.Height / 2);
        double pointerLength = PointerLength;

        // All the points on the path
        Point[] points =
            {
                new Point(pointerLength + radius, 0), new Point(rect.Width - radius, 0), // Top
                new Point(rect.Width, radius), new Point(rect.Width, rect.Height - radius), // Right
                new Point(rect.Width - radius, rect.Height), // Bottom
                new Point(pointerLength + radius, rect.Height), // Bottom
                new Point(pointerLength, rect.Height - radius), // Left
                new Point(pointerLength, radius) // Left
            };

        StreamGeometry geometry = new StreamGeometry();
        geometry.FillRule = FillRule.Nonzero;
        using (StreamGeometryContext ctx = geometry.Open())
        {
            ctx.BeginFigure(points[0], true, true);
            ctx.LineTo(points[1], true, false);
            ctx.ArcTo(points[2], new Size(radius, radius), 0, false, SweepDirection.Clockwise, true, false);
            ctx.LineTo(points[3], true, false);
            ctx.ArcTo(points[4], new Size(radius, radius), 0, false, SweepDirection.Clockwise, true, false);
            ctx.LineTo(points[5], true, false);

            ctx.ArcTo(points[6], new Size(radius, radius), 0, false, SweepDirection.Clockwise, true, false);

            // Pointer
            if (pointerLength > 0)
            {
                ctx.LineTo(rect.BottomLeft, true, false);
                ctx.LineTo(new Point(pointerLength, rect.Height - radius - OpeningGap), true, false);
            }
            ctx.LineTo(points[7], true, false);

            ctx.ArcTo(points[0], new Size(radius, radius), 0, false, SweepDirection.Clockwise, true, false);
        }
        return geometry;
    }
}
}

只需确保此类的命名空间已加载到 XAML 导入中（我使用名为“Framework”的命名空间），并且使用起来很简单：

    <Framework:BalloonDecorator  Background="#FFFF6600" PointerLength="50"
     CornerRadius="5" Opacity=".9" Margin="200,120,0,0"
     HorizontalAlignment="Left" VerticalAlignment="Top" Visibility="{Binding UnitPriceChangedBalloonVisibility}">
        <Border CornerRadius="2">
            <Border CornerRadius="2">
                <Button Height="Auto" Command="{Binding CloseUnitPriceChangedBalloonCommand}" Background="Transparent" BorderBrush="{x:Null}">
                <TextBlock Text="Please review the price. The Units have changed."
                     HorizontalAlignment="Left"
                     VerticalAlignment="Top"
                     FontStyle="Italic"
                     TextWrapping="Wrap"
                     Margin="10"
                     />
                     </Button>
            </Border>
        </Border>
    </Framework:BalloonDecorator>

显然，我将可见性绑定到绑定，但您可以将其设置为 true 并将其放入您的 Validation.ErrorTemplate 中。

希望这有帮助！

Answer 3

我一直在寻找比 BalloonDecorator 更好的解决方案，并浏览了 http://www.hardcodet.net/projects/wpf-notifyicon 项目。 它在最低级别使用 WinAPI，这可能会让您在构建自己的解决方案方面领先一步。 乍一看似乎可以解决这个问题，但我没有足够的时间来验证 BalloonTip 是否可以按照您所描述的那样运行。

祝您的项目顺利！

Answer 4

也许您可以使用 WindowsFormsHost 类型在 WPF 中托管 Windows 窗体控件。

MSDN 上有一个关于如何执行此操作的演练：

在 WPF 中托管 Windows 窗体复合控件

使用此技术，您也许可以使用 System.Windows.Forms.ToolTip 控件。如果将此控件的 IsBalloon 属性 设置为 true，它将显示为气球窗口。

Answer 5

看看这个：

https://www.nuget.org/packages/Laila.BalloonTip

https://sourceforge.net/projects/laila-balloontip/

只需添加 Nuget 包 Laila.BalloonTip，将控件放入 XAML 中并设置 PlacementTarget、Placement、PopupAnimation、Timeout 和 Text 或 ContentTemplate 以及可选的 HorizontalOffset 属性。您还可以通过 BalloonTemplate 属性重新定义整个气球。

查看示例应用程序和源代码。