在Rect對象上創建WPF工具提示

Question

我正在使用一個開源圖表庫，在圖表上創建標記。 （動態數據顯示）我正在創建的標記是使用Rect對象創建的。 我注意到System.Windows.Shapes中的所有Shapes都有一個ToolTip屬性，但System.Windows.Rect沒有。 我希望彈出一個工具提示，告訴用戶當鼠標懸停在標記上時標記的價格值。 當鼠標進入rect占據的區域時，我正在考慮創建並彈出一個工具提示，但我不知道有多少可能考慮到矩形將被圖表縮放/平移。 還有其他建議嗎？

這是我正在創建的標記的代碼（來自Felice Pollano博客）

using System;
using System.Collections.Generic;
using System.Linq;
using System.Windows.Shapes;
using System.Windows.Controls;
using System.Text;
using System.Windows;
using System.Windows.Media;

namespace Microsoft.Research.DynamicDataDisplay.PointMarkers
{
public class CandleStickPointMarker:ShapePointMarker,ITransformAware
{
    public double CandlestickWidth
    {
        get { return (double)GetValue(CandlestickWidthProperty); }
        set { SetValue(CandlestickWidthProperty, value); }
    }
    public static readonly DependencyProperty CandlestickWidthProperty =
        DependencyProperty.Register("CandlestickWidth", typeof(double), typeof(CandleStickPointMarker), new UIPropertyMetadata(4.0));
    public double CandlestickStrokeWidth
    {
        get { return (double)GetValue(CandlestickStrokeWidthProperty); }
        set { SetValue(CandlestickStrokeWidthProperty, value); }
    }

    public static readonly DependencyProperty CandlestickStrokeWidthProperty =
        DependencyProperty.Register("CandlestickStrokeWidth", typeof(double), typeof(CandleStickPointMarker), new UIPropertyMetadata(1.0));
    public Brush WhiteCandleFill
    {
        get { return (Brush)GetValue(WhiteCandleFillProperty); }
        set { SetValue(WhiteCandleFillProperty, value); }
    }

    public static readonly DependencyProperty WhiteCandleFillProperty =
        DependencyProperty.Register("WhiteCandleFill", typeof(Brush), typeof(CandleStickPointMarker), new UIPropertyMetadata(Brushes.White));



    public Brush WhiteCandleStroke
    {
        get { return (Brush)GetValue(WhiteCandleStrokeProperty); }
        set { SetValue(WhiteCandleStrokeProperty, value); }
    }

    public static readonly DependencyProperty WhiteCandleStrokeProperty =
        DependencyProperty.Register("WhiteCandleStroke", typeof(Brush), typeof(CandleStickPointMarker), new UIPropertyMetadata(Brushes.DarkGray));



    public Brush BlackCandleFill
    {
        get { return (Brush)GetValue(BlackCandleFillProperty); }
        set { SetValue(BlackCandleFillProperty, value); }
    }
    public static readonly DependencyProperty BlackCandleFillProperty =
        DependencyProperty.Register("BlackCandleFill", typeof(Brush), typeof(CandleStickPointMarker), new UIPropertyMetadata(Brushes.Black));
    public Brush BlackCandleStroke
    {
        get { return (Brush)GetValue(BlackCandleStrokeProperty); }
        set { SetValue(BlackCandleStrokeProperty, value); }
    }

    public static readonly DependencyProperty BlackCandleStrokeProperty =
        DependencyProperty.Register("BlackCandleStroke", typeof(Brush), typeof(CandleStickPointMarker), new UIPropertyMetadata(Brushes.Gray));
    public CoordinateTransform Transform { get; set; }
    public double High
    {
        get { return (double)GetValue(HighProperty); }
        set { SetValue(HighProperty, value); }
    }

    public static readonly DependencyProperty HighProperty =
        DependencyProperty.Register("High", typeof(double), typeof(CandleStickPointMarker), new UIPropertyMetadata(0.0));

    public double Low
    {
        get { return (double)GetValue(LowProperty); }
        set { SetValue(LowProperty, value); }
    }

    public static readonly DependencyProperty LowProperty =
        DependencyProperty.Register("Low", typeof(double), typeof(CandleStickPointMarker), new UIPropertyMetadata(0.0));


    public double Open
    {
        get { return (double)GetValue(OpenProperty); }
        set { SetValue(OpenProperty, value); }
    }

    public static readonly DependencyProperty OpenProperty =
        DependencyProperty.Register("Open", typeof(double), typeof(CandleStickPointMarker), new UIPropertyMetadata(0.0));


    public override void Render(System.Windows.Media.DrawingContext dc, Point screenPoint)
    {
        Point screenOpen = GetScreenPoint(Open,screenPoint.X);
        Point screenHigh = GetScreenPoint(High,screenPoint.X);
        Point screenLow = GetScreenPoint(Low, screenPoint.X);
        //screenPoint is the CLOSE by gentleman agreement.
        var close = screenPoint.ScreenToData(Transform).Y;
        Pen strokePen;
        if (Open >= close) // black
        {
            strokePen = new Pen(BlackCandleStroke, CandlestickStrokeWidth);
            var h = -screenOpen.Y + screenPoint.Y;
            Rect blkRect = new Rect(screenPoint.X - CandlestickWidth / 2, screenOpen.Y, CandlestickWidth, h);                       
            dc.DrawRectangle(BlackCandleFill,strokePen, blkRect);
            dc.DrawLine(strokePen, screenLow, screenPoint);
            dc.DrawLine(strokePen, screenHigh, screenOpen);
        }
        else // white
        {
            strokePen=new Pen(WhiteCandleStroke, CandlestickStrokeWidth);
            var h = screenOpen.Y - screenPoint.Y;
            Rect whtRect = new Rect(screenPoint.X - CandlestickWidth / 2, screenPoint.Y, CandlestickWidth, h);
            dc.DrawRectangle(WhiteCandleFill, strokePen, whtRect);
            dc.DrawLine(strokePen, screenLow, screenOpen);
            dc.DrawLine(strokePen, screenHigh, screenPoint);
        }
    }

    private Point GetScreenPoint(double Open,double screenX)
    {
        Point screen = new Point(0, Open);
        return new Point(screenX,screen.DataToScreen(Transform).Y);
    }
}

}

Answer 1

我不知道這對你有多大幫助，但我認為燭台標記應該類似於矩形標記。 下面的代碼顯示了我如何在D3（實際上是正方形）中創建一個矩形標記，使用Polygon類，與CircleElementPointMarker類似，工具提示功能正常工作。

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

namespace Microsoft.Research.DynamicDataDisplay.PointMarkers
{
    /// <summary>Adds Rectangle element at every point of graph</summary>
    public class RectangleElementPointMarker : ShapeElementPointMarker
    {
        Polygon Rectangle;

        public override UIElement CreateMarker()
        {
            Rectangle = new Polygon();
            Rectangle.Stroke = (Pen != null) ? Pen.Brush : Brushes.White;
            Rectangle.StrokeThickness = (Pen != null) ? Pen.Thickness : 0;
            Rectangle.Fill = Fill;
            Rectangle.HorizontalAlignment = HorizontalAlignment.Center;
            Rectangle.VerticalAlignment = VerticalAlignment.Center;
            Rectangle.Width = Size;
            Rectangle.Height = Size;

            Point Point1 = new Point(-Rectangle.Width / 2, -Rectangle.Height / 2);
            Point Point2 = new Point(-Rectangle.Width / 2, Rectangle.Height / 2);
            Point Point3 = new Point(Rectangle.Width / 2, Rectangle.Height / 2);
            Point Point4 = new Point(Rectangle.Width / 2, -Rectangle.Height / 2);
            PointCollection myPointCollection = new PointCollection();
            myPointCollection.Add(Point1);
            myPointCollection.Add(Point2);
            myPointCollection.Add(Point3);
            myPointCollection.Add(Point4);
            Rectangle.Points = myPointCollection;

            if (!String.IsNullOrEmpty(ToolTipText))
            {
                ToolTip tt = new ToolTip();
                tt.Content = ToolTipText;
                Rectangle.ToolTip = tt;
            }

            return Rectangle;
        }

        public override void SetPosition(UIElement marker, Point screenPoint)
        {

            Canvas.SetLeft(marker, screenPoint.X - Size / 2);
            Canvas.SetTop(marker, screenPoint.Y - Size / 2);
        }
    }
}

代碼是在.NET 4.0，VS2010上編譯的

Answer 2

一種選擇是使用Rectangle而不是Rect 。

另一種選擇是使用Path並將Data屬性設置為RectangleGeometry 。

這是RectangleGeometry的MSDN文章。

Answer 3

實現這一目標的最簡單方法是遵循以下步驟：

1. 在您的直流區域上方創建一個Canvas（將其命名為tooltipLayer）（寬度和高度相同，邊界為dc）。
2. 對於dc中的每個矩形，將一個畫布（將它們命名為tooltipContainers）添加到tooltipLayer。
3. 每個tooltipContainer的寬度和高度等於零，邊距等於“X，Y，0,0”，其中X和Y是其對應的矩形的X和Y，並且還有一個邊框作為子元素。
4. 每個邊框必須與其對應的矩形具有相同的寬度和高度，並將其背景設置為幾乎不可見的內容（如“＃01000000”）
5. 向每個邊框添加工具提示