一起学习ArcEngine（5）全图

昨天写了一半突然断电，没有存盘，只有重写了，郁闷啊！

和zoomout、zoomin等工具不同，全图工具不用和地图交互，属于命令类工具，只要实现ICommand接口即可。参考zoomout的实现，首先新建一个基类CommandBase，实现Icommand接口，然后新建FullExtent类，继承这个基类，重写一下OnClick方法，即可。

public class CommandBase:BaseCommand,IDisposable
    {
        protected  IHookHelper m_pHookHelper;

        protected object m_pControl;
        protected IActiveView m_pActiveView;
        protected IMap m_pMap;

         /// <summary>
         ///
         /// </summary>
         /// <param name="str">工具的名称</param>
        public CommandBase(string str):base()
        {
            m_pHookHelper=new HookHelperClass();
            InitialToolRes(str);
        }
        /// <summary>
        ///
        /// </summary>
        /// <param name="mapCtl">工具关联的地图控件</param>
        /// <param name="str"></param>
        public CommandBase(AxMapControl mapCtl, string str)
            :this(str)
        {
            OnCreate(mapCtl.Object);
        }

        /// <summary>
        ///
        /// </summary>
        /// <param name="plCtl">工具关联的地图控件</param>
        /// <param name="str"></param>
        public CommandBase(AxPageLayoutControl plCtl, string str)
            : this(str)
        {
            OnCreate(plCtl.Object);
        }


        public override void OnCreate(object hook)
        {
            m_pHookHelper.Hook=hook;

            if (hook is Control)
            {
                m_pControl = hook;
                if (hook is AxMapControl)
                {
                    AxMapControl mapcontrl = hook as AxMapControl;
                    m_pHookHelper.Hook = mapcontrl.Object;
                }
                else if (hook is AxPageLayoutControl)
                {
                    AxPageLayoutControl pagepcontrl = hook as AxPageLayoutControl;
                    m_pHookHelper.Hook = pagepcontrl.Object;
                }
            }
            else
            {
                if (hook is IMapControlDefault)
                {
                    IMapControlDefault pMapDefault = hook as IMapControlDefault;
                    m_pControl = Control.FromChildHandle(new IntPtr(pMapDefault.hWnd));
                    m_pHookHelper.Hook = pMapDefault;
                }
                else if (hook is IPageLayoutControlDefault)
                {
                    IPageLayoutControlDefault pPageDefault = hook as IPageLayoutControlDefault;
                    m_pControl = Control.FromChildHandle(new IntPtr(pPageDefault.hWnd));
                    m_pHookHelper.Hook = pPageDefault;
                }
            }

            m_pActiveView = m_pHookHelper.ActiveView;
            m_pMap = m_pHookHelper.FocusMap;
        }


        //初始化该功能的GUI资源
        private  void InitialToolRes(string str)
        {
            ResourceManager pResourceManager = Resources.ResourceManager;
            pResourceManager.IgnoreCase=true;
            base.m_bitmap=(Bitmap)pResourceManager.GetObject("bmp"+str);
            base.m_name = (string)pResourceManager.GetObject("na" + str);
            base.m_caption = (string)pResourceManager.GetObject("cpt" + str);
            if (m_caption == string.Empty) m_caption = m_name;

            base.m_category=(string)pResourceManager.GetObject("ctg"+str);

            base.m_message=(string)pResourceManager.GetObject("msg"+str);
            if (m_message == string.Empty) m_message = m_name;

            base.m_toolTip=(string)pResourceManager.GetObject("tlt"+str);
            if (m_toolTip == string.Empty) m_toolTip = m_name;

            pResourceManager.ReleaseAllResources();
        }



        #region IDisposable 成员

        public void Dispose()
        {
            m_pHookHelper = null;
            m_bitmap = null;
            Marshal.ReleaseComObject(m_pHookHelper);
        }

        #endregion
    }

FullExtent类的代码如下，

    public class FullExtent : CommandBase
    {
        public FullExtent()
            : base("FullExtent")
        { }
        public FullExtent(AxMapControl mapCtl)
            : base(mapCtl, "FullExtent")
        { }
        public FullExtent(AxPageLayoutControl plCtl)
            : base(plCtl, "FullExtent")
        { }

        public override void OnClick()
        {
            m_pActiveView.Extent = m_pActiveView.FullExtent;
            m_pActiveView.Refresh();
        }
    }