Canvas上のオブジェクトをドラッグ&ドロップ

Canvasの上にあるオブジェクトをドラッグ&ドロップする。

How to: Drag and Drop Objects

Silverlight / WPF

        #region Handle
        bool isMouseCaptured;
        Point mousePosition;

        void HandleMouseDown(object sender, MouseButtonEventArgs e)
        {
            FrameworkElement item = sender as FrameworkElement;
            mousePosition = e.GetPosition(null);
            isMouseCaptured = true;
            item.CaptureMouse();
            item.Cursor = Cursors.Hand;

            e.Handled = true;
        }
        void HandleMouseMove(object sender, MouseEventArgs e)
        {
            FrameworkElement item = sender as FrameworkElement;
            if (isMouseCaptured)
            {
                // Calculate the current position of the object.
                double deltaV = e.GetPosition(null).Y - mousePosition.Y;
                double deltaH = e.GetPosition(null).X - mousePosition.X;
                double newTop = deltaV + (double)item.GetValue(Canvas.TopProperty);
                double newLeft = deltaH + (double)item.GetValue(Canvas.LeftProperty);

                // Set new position of object.
                item.SetValue(Canvas.TopProperty, newTop);
                item.SetValue(Canvas.LeftProperty, newLeft);

                // Update position global variables.
                mousePosition = e.GetPosition(null);
            }

            e.Handled = true;
        }
        void HandleMouseUp(object sender, MouseButtonEventArgs e)
        {
            FrameworkElement item = sender as FrameworkElement;
            isMouseCaptured = false;
            item.ReleaseMouseCapture();
            mousePosition.X = mousePosition.Y = 0;
            item.Cursor = null;

            e.Handled = true;
        }
        #endregion