// Copyright 2012 ESRI
// 
// All rights reserved under the copyright laws of the United States
// and applicable international laws, treaties, and conventions.
// 
// You may freely redistribute and use this sample code, with or
// without modification, provided you include the original copyright
// notice and use restrictions.
// 
// See the use restrictions.
// 

using System;
using ESRI.ArcGIS.Carto;
using ESRI.ArcGIS.Geometry;
using ESRI.ArcGIS.Controls;
using ESRI.ArcGIS.SystemUI;
using ESRI.ArcGIS.ADF.CATIDs;
using System.Runtime.InteropServices;

namespace PanZoom
{
  [ClassInterface(ClassInterfaceType.None)]
  [Guid("139290CC-94E0-4d70-AF52-EBA664801E49")]

  public class PanLeft : ICommand
  {
        #region COM Registration Function(s)
        [ComRegisterFunction()]
        [ComVisible(false)]
        static void RegisterFunction(Type registerType)
        {
            // Required for ArcGIS Component Category Registrar support
            ArcGISCategoryRegistration(registerType);

            //
            // TODO: Add any COM registration code here
            //
        }

        [ComUnregisterFunction()]
        [ComVisible(false)]
        static void UnregisterFunction(Type registerType)
        {
            // Required for ArcGIS Component Category Registrar support
            ArcGISCategoryUnregistration(registerType);

            //
            // TODO: Add any COM unregistration code here
            //
        }

        #region ArcGIS Component Category Registrar generated code
        /// <summary>
        /// Required method for ArcGIS Component Category registration -
        /// Do not modify the contents of this method with the code editor.
        /// </summary>
        private static void ArcGISCategoryRegistration(Type registerType)
        {
            string regKey = string.Format("HKEY_CLASSES_ROOT\\CLSID\\{{{0}}}", registerType.GUID);
            ControlsCommands.Register(regKey);

        }
        /// <summary>
        /// Required method for ArcGIS Component Category unregistration -
        /// Do not modify the contents of this method with the code editor.
        /// </summary>
        private static void ArcGISCategoryUnregistration(Type registerType)
        {
            string regKey = string.Format("HKEY_CLASSES_ROOT\\CLSID\\{{{0}}}", registerType.GUID);
            ControlsCommands.Unregister(regKey);

        }

        #endregion
        #endregion

    [DllImport("gdi32.dll")]
    static extern bool DeleteObject(IntPtr hObject);

    private System.Drawing.Bitmap m_bitmap;
    private IntPtr m_hBitmap;
    private IHookHelper m_pHookHelper;

    public PanLeft()
    {
      string[] res = GetType().Assembly.GetManifestResourceNames();
      if(res.GetLength(0) > 0)
      {
        m_bitmap = new System.Drawing.Bitmap(GetType().Assembly.GetManifestResourceStream(GetType(), "PanLeft.bmp"));
        if(m_bitmap != null)
        {
          m_bitmap.MakeTransparent(m_bitmap.GetPixel(1,1));
          m_hBitmap = m_bitmap.GetHbitmap();
        }
      }
      m_pHookHelper = new HookHelperClass ();
    }

    ~PanLeft()
    {
      if(m_hBitmap.ToInt32() != 0)
        DeleteObject(m_hBitmap);
    }
  
    #region ICommand Members

    public void OnClick()
    {
      if(m_pHookHelper == null) return;

      //Get the active view
      IActiveView pActiveView = (IActiveView) m_pHookHelper.FocusMap;

      //Get the extent
      IEnvelope pEnvelope = (IEnvelope) pActiveView.Extent;

      //Create a point to pan to
      IPoint pPoint;
      pPoint = new PointClass();
      pPoint.X = ((pEnvelope.XMin + pEnvelope.XMax) / 2) - (pEnvelope.Height / (100 / GetPanFactor()));
      pPoint.Y = ((pEnvelope.YMin + pEnvelope.YMax) / 2); 

      //Center the envelope on the point
      pEnvelope.CenterAt(pPoint);

      //Set the new extent
      pActiveView.Extent = pEnvelope;

      //Refresh the active view
      pActiveView.Refresh();
    }

    private long GetPanFactor()
    {
      return 50;
    }

    public string Message
    {
      get
      {
        return "Pan display left by the pan factor percentage";
      }
    }

    public int Bitmap
    {
      get
      {
        return m_hBitmap.ToInt32();
      }
    }

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

    public string Caption
    {
      get
      {
        return "Pan Left";
      }
    }

    public string Tooltip
    {
      get
      {
        return "Pan Left";
      }
    }

    public int HelpContextID
    {
      get
      {
        // TODO:  Add PanLeft.HelpContextID getter implementation
        return 0;
      }
    }

    public string Name
    {
      get
      {
        return "Sample_Pan/Zoom_Pan Left";
      }
    }

    public bool Checked
    {
      get
      {
        return false;
      }
    }

    public bool Enabled
    {
      get
      {
        if(m_pHookHelper.FocusMap == null) return false;
        
        return true;
      }
    }

    public string HelpFile
    {
      get
      {
        // TODO:  Add PanLeft.HelpFile getter implementation
        return null;
      }
    }

    public string Category
    {
      get
      {
        return "Sample_Pan/Zoom";
      }
    }

    #endregion
  }
}