WPF鼠标拖动控件源码

【实例简介】

WPF鼠标点击控件或元素，直接拖动，显示拖动效果，拖动图可以是原控件，也可自己定义
【实例截图】

【核心代码】

   private void panelDrag_MouseMove(object sender, MouseEventArgs e)
        {
            if (e.LeftButton == MouseButtonState.Pressed )
            {
                Win32.POINT point = new Win32.POINT();
                if (m_bIniMouseCap == false)
                {
                    Win32.GetCursorPos(ref point);
                    if (Math.Abs(point.x - _currPoint.x) > 0.2 || Math.Abs(point.y - _currPoint.y) > 0.2)
                    {
                        m_bIniMouseCap = true;
                        if (Mouse.Captured == null) Mouse.Capture(panelDrag);
                    }
                    else
                        return;
                }
                Win32.GetCursorPos(ref point);
                _currPoint = point;

                popTree.IsOpen = true;
                UpdateWindow(point);

            }
            else
            {
                m_bIniMouseCap = false;

                if (Mouse.Captured != null)
                {
                    Mouse.Capture(null);
                    //Mouse.AddMouseUpHandler(sender, e);
                    popTree.IsOpen = false;

                    /*
                    System.Windows.Forms.Integration.WindowsFormsHost ui = null;

                    if (ui != null)
                    {

                        // HwndSource hwndSource = PresentationSource.FromVisual(wndParent.gridContent.Children[0]) as HwndSource;
                        //Point pp=Mouse.GetPosition(wndParent.gridContent);
                        //Point pw= wndParent.gridContent.PointToScreen(pp);
                        //hwndSource = (HwndSource)PresentationSource.FromDependencyObject(this.Child);
                        //var hwnd = hwndSource.Handle;
                        //Win32.RECT rect;
                        //Win32.GetWindowRect(hwnd, out rect);
                        //求得控件相对于窗体的位置
                        Window window = Window.GetWindow(ui);
                        Point point = ui.TransformToAncestor(window).Transform(new Point(0, 0));

                        if (point.Y window.Top < _currPoint.y && point.Y window.Top ui.ActualHeight > _currPoint.y && point.X window.Left 10 < _currPoint.x && point.X window.Left ui.ActualWidth > _currPoint.x)
                        {
                         
                            Win32.mouse_event((int)(Win32.MouseEventFlags.LeftUp), 0, 0, 0, IntPtr.Zero);

                        }

                    }//*/
                }

            }
        }