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？

我想使用微软的native balloon control。我如何将这个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 \ v4.0 \ 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：

enter image description here

希望这有帮助！

Answer 2

This BalloonDecorator Project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。我知道您可以修改您的错误模板以显示此装饰器，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使它看起来像你想要的，并且不必依赖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;
    }
}
}

只需确保将此类的命名空间加载到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并将其放在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，并且遇到了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。乍一看它似乎有可能解决它，但我没有足够的时间来验证BalloonTip是否能像你所描述的那样表现出来。

祝你的项目好运！

Answer 4

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

MSDN上有关于如何执行此操作的演练：

Hosting a Windows Forms Composite Control in WPF

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

如何在文本框中显示气球提示？

4 个答案: