Silverlight 颜色选择器

 private void SetPopupPosition()
        {
            if (colorBoard != null && Application.Current != null && Application.Current.Host != null && Application.Current.Host.Content != null)
            {
                double contentheight = Application.Current.Host.Content.ActualHeight;
                double contentwidth = Application.Current.Host.Content.ActualWidth;
                double colorboardheight = colorBoard.ActualHeight;
                double colorboardwidth = colorBoard.ActualWidth;
                double pickerheight = ActualHeight;
                double pickerwidth = ActualWidth;

                if (rootElement != null)
                {
                    GeneralTransform transform = rootElement.TransformToVisual(null);
                    if (transform != null)
                    {
                        Point point00 = transform.Transform( new Point(0.0, 0.0));
                        Point point10 = transform.Transform( new Point(1.0, 0.0));
                        Point point01 = transform.Transform( new Point(0.0, 1.0));

                        double x00 = point00.X;
                        double y00 = point00.Y;
                        double x = x00;
                        double y = y00 pickerheight;

                        if (contentheight < (y colorboardheight))
                        {
                            y = y00 - colorboardheight;
                        }
                        if (contentwidth < (x colorboardwidth))
                        {
                            x = x00 pickerwidth - colorboardwidth;
                        }

                        popupDropDown.HorizontalOffset = 0.0;
                        popupDropDown.VerticalOffset = 0.0;
                        canvasOutsidePopup.Width = contentwidth;
                        canvasOutsidePopup.Height = contentheight;
                        colorBoard.HorizontalAlignment = HorizontalAlignment.Left;
                        colorBoard.VerticalAlignment = VerticalAlignment.Top;
                        Canvas.SetLeft(colorBoard, x - x00);
                        Canvas.SetTop(colorBoard, y - y00);

                        Matrix identity = Matrix.Identity;
                        identity.M11 = point10.X - point00.X;
                        identity.M12 = point10.Y - point00.Y;
                        identity.M21 = point01.X - point00.X;
                        identity.M22 = point01.Y - point00.Y;
                        identity.OffsetX = point00.X;
                        identity.OffsetY = point00.Y;

                        MatrixTransform matrixtransform = new MatrixTransform();
                        InvertMatrix(ref identity);

                        matrixtransform.Matrix = identity;
                        canvasOutsidePopup.RenderTransform = matrixtransform;
                    }
                }
            }
        }

using System;
using System.Collections.Generic;
using System.Linq;
using System.Net;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Animation;
using System.Windows.Shapes;

namespace SilverlightControls
{
    public partial class App : Application
    {

        public App（）
        {
            this.Startup += this.Application_Startup;
            this.Exit += this.Application_Exit;
            this.UnhandledException += this.Application_UnhandledException;

            InitializeComponent（）;
        }

        private void Application_Startup（object sender StartupEventArgs e）
        {
            this.RootVisual = new MainPage（）;
        }

        private void Application_Exit（object sender EventArgs e）
        {

        }

        private void Application_UnhandledException（object sender ApplicationUnhandledExceptionEvent

 属性            大小     日期    时间   名称
----------- ---------  ---------- -----  ----
     目录           0  2010-12-30 14:06  SilverlightControls\
     文件         302  2010-12-08 14:17  SilverlightControls\App.xaml
     文件        2409  2010-12-08 14:17  SilverlightControls\App.xaml.cs
     目录           0  2010-12-30 11:06  SilverlightControls\ColorPicker\
     文件       18520  2010-12-16 15:45  SilverlightControls\ColorPicker\ColorBoard.cs
     文件        6093  2010-12-10 10:35  SilverlightControls\ColorPicker\ColorHelper.cs
     文件        9126  2010-12-16 15:42  SilverlightControls\ColorPicker\ColorPicker.cs
     文件       28497  2010-12-13 17:30  SilverlightControls\ColorPicker\PredefinedColor.cs
     文件        4639  2010-12-14 16:09  SilverlightControls\ColorPicker\PredefinedColorItem.cs
     文件        3773  2010-12-18 14:52  SilverlightControls\MainPage.xaml
     文件         846  2010-12-25 13:57  SilverlightControls\MainPage.xaml.cs
     目录           0  2010-12-30 14:05  SilverlightControls\Properties\
     文件         207  2010-12-08 14:17  SilverlightControls\Properties\AppManifest.xml
     文件        1427  2010-12-08 14:17  SilverlightControls\Properties\AssemblyInfo.cs
     文件        5449  2010-12-25 13:49  SilverlightControls\SilverlightControls.csproj
     文件         927  2010-12-08 14:17  SilverlightControls\SilverlightControls.sln
     文件       16896  2010-12-30 14:06  SilverlightControls\SilverlightControls.suo
     目录           0  2010-12-30 11:06  SilverlightControls\Themes\
     文件       45979  2010-12-16 15:54  SilverlightControls\Themes\Generic.xaml
     文件         191  2010-12-12 14:02  SilverlightControls\Themes\Transparent.PNG