WPF 容器的Z顺序操作

当需要动态添加、修改、删除控件时，如果要达到最好的效果，肯定不只是把需要的控件添加到容器中，并且还需要把容器中的已有控件进行排序操作（置顶、置底、前移、后移操作）。由于初次接触到wpf，所以对很多知识都不熟悉，现自己动手实现了一个Zindex的操作算法。

      /// <summary>
        /// 操作控件的Z顺序
        /// </summary>
        /// <param name="sender">菜单</param>
        /// <param name="moveToFront">True 前移 ，false 置后</param>
        /// <param name="toBottom">true 移动至底端，false 移动一层</param>
        private void doMoveZindex(object sender, bool moveToFront, bool toBottom)
        {
            UIElement ui = ContextMenuService.GetPlacementTarget(LogicalTreeHelper.GetParent(sender as MenuItem));
            if (ui is FrameworkElement)
            {
                FrameworkElement fui = ui as FrameworkElement;
                if (fui == null) return;

                int nowZIndex = Canvas.GetZIndex(fui);

                //deviceOperator.DeviceCollection保存的就是每个控件对应设备的位置和z顺序值
                //取得最大z顺序 
                int maxZindex = deviceOperator.DeviceCollection
                                             .Select(t => t.ZIndex1)
                                             .Max();
 //需要转换的zindex
                int nextZindex = -;
                if (moveToFront) //前移
                {
                    //如果已经位于最顶层，则取消
                    if (nowZIndex == maxZindex) return;
                    if (toBottom) //移动到最顶层
                    {
                        nextZindex = maxZindex;
                        foreach (FrameworkElement childElement in parentCanvas.Children)
                        {
                            int zi = Canvas.GetZIndex(childElement);

                            if (zi > nowZIndex)
                            {
                                Canvas.SetZIndex(childElement, zi - );
                                updateDevice(childElement);
                                maxZindex = -;
                            }
                        }
                    }
                    else//上移一层
                    {
                        nextZindex = nowZIndex + ;
                        foreach (FrameworkElement childElement in parentCanvas.Children)
                        {
                            if (Canvas.GetZIndex(childElement) == nextZindex)
                            {
                                Canvas.SetZIndex(childElement, nowZIndex);
                                updateDevice(childElement);
                                maxZindex = -;
                                break;
                            }
                        }

                    }
                    if (maxZindex == -)
                    {
                        Canvas.SetZIndex(fui, nextZindex);

                        updateDevice(fui);
                    }
                }
                else //置底
                {
                    if (nowZIndex == ) return;
                    if (toBottom)
                    {
                        nextZindex = ;
                        foreach (FrameworkElement childElement in parentCanvas.Children)
                        {
                            int zi = Canvas.GetZIndex(childElement);
                            if (zi < nowZIndex)
                            {
                                Canvas.SetZIndex(childElement, zi + );
                                updateDevice(childElement);//保存控件的Z顺序值到deviceoperator.DeviceCollection
                                maxZindex = -;
                            }
                        }
                    }
                    else
                    {
                        nextZindex = nowZIndex - ;
                        foreach (FrameworkElement childElement in parentCanvas.Children)
                        {
                            if (Canvas.GetZIndex(childElement) == nextZindex)
                            {
                                Canvas.SetZIndex(childElement, nowZIndex);
                                updateDevice(childElement);
                                maxZindex = -;
                                break;
                            }
                        }
                    }
                    if (maxZindex == -)
                    {
                        Canvas.SetZIndex(fui, nextZindex);
                        updateDevice(fui);
                    }
                }
            }
        }
    

//调用方法
//前移
 doMoveZindex(sender, true, false);
//置项
  doMoveZindex(sender, true, true);
//后移
 doMoveZindex(sender, false, false);
//置底
 doMoveZindex(sender, false, true);

这样的一个前提条件是容器中的每一个控件的ZIndex值都不会相同。

待解决的问题：现在变化的z顺序，是针对整个容器来说的。如果可以针对控件的重叠区域，进行修改Z顺序，那么速度应该会得到相应的提升。