ArcGIS API for Silverlight 鼠标移入移出地图要素d出窗口（优化处理）

概述     在之前博客里的ArcGIS API for Silverlight d出框实例中，是通过点击地图要素，d出框，但是由于没有控制元素个数，只是通过显示隐藏来进行的话，在鼠标移入和移出 *** 作中，会出现鼠标移入的时候，总不能立刻d出框，而是需要多次才行，用户体验较差，现在通过控制加入一个d出框，移出时去除刚加入的d出框，严格控制d出框个数来实现。 核心代码如下： //鼠标移入事件 graphi

     在之前博客里的ArcGIS API for Silverlight d出框实例中，是通过点击地图要素，d出框，但是由于没有控制元素个数，只是通过显示隐藏来进行的话，在鼠标移入和移出 *** 作中，会出现鼠标移入的时候，总不能立刻d出框，而是需要多次才行，用户体验较差，现在通过控制加入一个d出框，移出时去除刚加入的d出框，严格控制d出框个数来实现。

核心代码如下：

//鼠标移入事件 graphic.MouseEnter += new MouseEventHandler(swz_graphic_MouseEnter); graphic.MouseLeave += new MouseEventHandler(swz_graphic_MouseLeave);voID swz_graphic_MouseEnter(object sender,MouseEventArgs e){            Point p = e.Getposition(LayoutRoot);            p.X = p.X - 40;            p.Y = p.Y - 165;            //鼠标左键，显示tooltip信息            Graphic g = sender as Graphic;            tip_Base.g_TipSW_leftBottom = new TipSW_leftBottom(this,p,g.Attributes["SWZMC"].ToString(),g.Attributes["SWZBM"].ToString());} voID swz_graphic_MouseLeave(object sender,MouseEventArgs e){            tip_Base.g_TipSW_leftBottom.closeWindow(this);}public partial class TipSW_leftBottom : UserControl{        MainPage mp;        string l_name;        string l_swzbm;        public TipSW_leftBottom()        {            InitializeComponent();        }        public TipSW_leftBottom(MainPage mp,Point p,string name,string swzbm)        {            InitializeComponent();            this.mp = mp;            this.l_name = name;            this.l_swzbm = swzbm;            //处理标题的间距问题            string tmp = name;            StringBuilder sb = new StringBuilder();            for (int i = 0; i < tmp.Length; i++)            {                sb.Append(tmp[i] + " ");            }            this.Title.Content = sb.ToString();            //绑定洪水预报的数据            getDataSoapClIEnt clIEnt = new getDataSoapClIEnt();            clIEnt.getHSYBInfoCompleted += new EventHandler<getHSYBInfoCompletedEventArgs>(clIEnt_getHSYBInfoCompleted);            clIEnt.getHSYBInfoAsync(name.Trim());            getXQYJInfoSoapClIEnt clIEnt2 = new getXQYJInfoSoapClIEnt();            clIEnt2.GetAllSWZCompleted += new EventHandler<GetAllSWZCompletedEventArgs>(clIEnt_GetAllSWZCompleted);            clIEnt2.GetAllSWZAsync();            this.margin = new Thickness(p.X,p.Y,0);            mp.LayoutRoot.Children.Add(this);        }        #region 通用方法，只需要更改Show，在实例化窗体的时候，传入不同的参数即可        private Point _location;        private bool _isShowing;        private Popup _popup;        private GrID _grID;        private Canvas _canvas;        private FrameworkElement _content;        //初始化并显示d出窗体.公共方法在显示菜单项时调用        public voID Show(Point location,string swzbm)        {            this.l_name = name;            this.l_swzbm = swzbm;            if (_isShowing)                throw new InvalIDOperationException();            _isShowing = true;            _location = location;            ConstructPopup(this);            _popup.IsOpen = true;            //处理标题的间距问题            string tmp = name;            StringBuilder sb = new StringBuilder();            for (int i = 0; i < tmp.Length; i++)            {                sb.Append(tmp[i] + " ");            }            this.Title.Content = sb.ToString();            //绑定洪水预报的数据            getDataSoapClIEnt clIEnt = new getDataSoapClIEnt();            clIEnt.getHSYBInfoCompleted += new EventHandler<getHSYBInfoCompletedEventArgs>(clIEnt_getHSYBInfoCompleted);            clIEnt.getHSYBInfoAsync(name.Trim());            //水位站数据            getXQYJInfoSoapClIEnt clIEnt2 = new getXQYJInfoSoapClIEnt();            clIEnt2.GetAllSWZCompleted += new EventHandler<GetAllSWZCompletedEventArgs>(clIEnt_GetAllSWZCompleted);            clIEnt2.GetAllSWZAsync();        }        public voID Show(Point location)        {            if (_isShowing)                throw new InvalIDOperationException();            _isShowing = true;            _location = location;            ConstructPopup(this);            _popup.IsOpen = true;        }        //关闭d出窗体        public voID Close()        {            _isShowing = false;            if (_popup != null)            {                _popup.IsOpen = false;            }        }        //d出框外面点击则关闭该窗口        protected virtual voID OnClickOutsIDe()        {            Close();        }        // 用GrID来布局，初始化d出窗体        //在GrID里面添加一个Canvas，用来监测菜单项外面的鼠标点击事件        private voID ConstructPopup(FrameworkElement _element)        {            if (_popup != null)                return;            _popup = new Popup();            _grID = new GrID();            _popup.Child = _grID;            _canvas = new Canvas();            _canvas.MouseleftbuttonDown += (sender,args) => { OnClickOutsIDe(); };            _canvas.MouseRightbuttonDown += (sender,args) => { args.Handled = true; OnClickOutsIDe(); };            _canvas.Background = new SolIDcolorBrush(colors.transparent);            _grID.Children.Add(_canvas);            _content = _element;            _content.HorizontalAlignment = HorizontalAlignment.left;            _content.VerticalAlignment = VerticalAlignment.top;            _content.margin = new Thickness(_location.X,_location.Y,0);            _grID.Children.Add(_content);            UpdateSize();        }        /// <summary>        /// 更新大小        /// </summary>        private voID UpdateSize()        {            _grID.WIDth = Application.Current.Host.Content.ActualWIDth;            _grID.Height = Application.Current.Host.Content.ActualHeight;            if (_canvas != null)            {                _canvas.WIDth = _grID.WIDth;                _canvas.Height = _grID.Height;            }        }        #endregion        #region WebService 调用方法及关闭窗体方法        voID clIEnt_GetAllSWZCompleted(object sender,GetAllSWZCompletedEventArgs e)        {            try            {                ObservableCollection<RiverFall> Lists = e.Result;                foreach (RiverFall item in Lists)                {                    if (item.SWZBM == l_swzbm)                    {                        this.dt.Content = item.DTNow.ToString("yyyy年M月d日H时");                        this.sw.Content = "水位：" + item.SW.ToString("N2") + "m";                    }                }            }            catch (Exception ex)            {                this.dt.Content = "没有监测到该站点数据";                this.sw.Content = "";            }        }        voID clIEnt_getHSYBInfoCompleted(object sender,getHSYBInfoCompletedEventArgs e)        {            try            {                IList<洪水预报> ret = e.Result;                if (ret.Count > 0)                {                    foreach (洪水预报 r in ret)                    {                        this.tbhsyb.Text = r.标题.Length > 9 ? r.标题.Substring(0,7) + "..." : r.标题;                        this.tbhsyb.Foreground = new SolIDcolorBrush(colors.Red);                    }                }                else                {                    this.tbhsyb.Text = "暂无预报";                    this.tbhsyb.Foreground = new SolIDcolorBrush(colors.Black);                }            }            catch            {            }        }        //用于移除刚加入的d出框，在主窗体鼠标移出后，调用此方法        public voID closeWindow(MainPage mp)        {             mp.LayoutRoot.Children.RemoveAt(mp.LayoutRoot.Children.Count - 1);        }        #endregion    }

这里代码中仍然保留了原先的点击d出框的Show方法，可以根据需要调用Show方法或直接实例化带参数的构造函数都可以。 总结

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