// Copyright 2010 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.Display;
using ESRI.ArcGIS.SystemUI;
using ESRI.ArcGIS.ADF.CATIDs;
using System.Runtime.InteropServices;

namespace PanZoom
{
  [ClassInterface(ClassInterfaceType.None)]
  [Guid("4BD2DDAE-AA6F-4718-AC2E-F39C5618895C")]

  public class Pan :  ICommand, ITool
  {
        #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;
    private bool m_enabled;
    private IAppDisplay m_appDisplay;
    private IScreenDisplay m_focusScreenDisplay;
    private bool m_PanOperation;
    private bool m_check;
    private System.Windows.Forms.Cursor m_cursor;
    private System.Windows.Forms.Cursor m_cursorMove;
        
    public Pan()
    {
      //Load resources
      string[] res = GetType().Assembly.GetManifestResourceNames();
      if(res.GetLength(0) > 0)
      {
        m_bitmap = new System.Drawing.Bitmap(GetType().Assembly.GetManifestResourceStream(GetType(), "Pan.bmp"));
        if(m_bitmap != null)
        {
          m_bitmap.MakeTransparent(m_bitmap.GetPixel(1,1));
          m_hBitmap = m_bitmap.GetHbitmap();
        }
      }
      m_pHookHelper = new HookHelperClass ();
    }

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

    public void OnClick()
    {
    }

    public string Message
    {
      get
      {
        return "Pans the Display by Grabbing";
      }
    }

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

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

      m_appDisplay = (IAppDisplay) m_pHookHelper.ActiveView.ScreenDisplay;
      m_enabled = true;
      m_check = false;
      m_cursor = new System.Windows.Forms.Cursor(GetType().Assembly.GetManifestResourceStream (GetType(), "Hand.cur"));
      m_cursorMove = new System.Windows.Forms.Cursor(GetType().Assembly.GetManifestResourceStream(GetType(), "MoveHand.cur"));
    }

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

    public string Tooltip
    {
      get
      {
        return "Pan by Grab";
      }
    }

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

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

    public bool Checked
    {
      get
      {
        return m_check;
      }
    }

    public bool Enabled
    {
      get
      {
        return m_enabled;
      }
    }

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

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

    #endregion
  
    #region ITool Members

    public void OnMouseDown(int button, int shift, int x, int y)
    {
      if (button != 1) return;

      IActiveView activeView = m_pHookHelper.ActiveView;
      IPoint point;

      //If in PageLayout view, find the closest map
      if(!(activeView is IMap))
      {
        point = activeView.ScreenDisplay.DisplayTransformation.ToMapPoint(x,y);
        IMap hitMap = activeView.HitTestMap(point);

        //Exit if no map found
        if(hitMap == null)
          return;
  
        if(activeView != m_pHookHelper.FocusMap)
          activeView.FocusMap = hitMap;
      }

      //Start the pan operation
      m_focusScreenDisplay = getFocusDisplay();
      point = activeView.ScreenDisplay.DisplayTransformation.ToMapPoint(x,y);
      m_focusScreenDisplay.PanStart(point);
      m_PanOperation = true;
    }

        private IScreenDisplay getFocusDisplay()
    {
      //Get the ScreenDisplay that has focus
      IActiveView activeView = m_pHookHelper.ActiveView;

      if(activeView is IMap)
        return m_appDisplay.FocusScreen; //data view
      else
      {
        activeView = m_pHookHelper.ActiveView.FocusMap as IActiveView; //layout view
        return activeView.ScreenDisplay;
      }
    }

    public void OnMouseMove(int button, int shift, int x, int y)
    {
      if(button != 1) return;

      if(! m_PanOperation) return;

      IPoint point = m_focusScreenDisplay.DisplayTransformation.ToMapPoint(x,y);
      m_focusScreenDisplay.PanMoveTo(point);
    }
    
    public void OnMouseUp(int button, int shift, int x, int y)
    {
      if(button != 1) return;

      if(! m_PanOperation) return;

      IEnvelope extent = m_focusScreenDisplay.PanStop();

      //Check if user dragged a rectangle or just clicked.
      //If a rectangle was dragged, m_ipFeedback in non-NULL
      if(extent != null)
      {
        m_focusScreenDisplay.DisplayTransformation.VisibleBounds = extent;
        m_focusScreenDisplay.Invalidate(null, true, (short)esriScreenCache.esriAllScreenCaches);
      }

      m_PanOperation = false;
    }

    public void OnKeyDown(int keyCode, int shift)
    {
      // TODO:  Add Pan.OnKeyDown implementation
    }

    public void OnKeyUp(int keyCode, int shift)
    {
      // TODO:  Add Pan.OnKeyUp implementation
    }

    public int Cursor
    {
      get
      {
        if(m_PanOperation)
                    return m_cursorMove.Handle.ToInt32();
        else
          return m_cursor.Handle.ToInt32();
      }
    }

    public bool OnContextMenu(int x, int y)
    {
      // TODO:  Add Pan.OnContextMenu implementation
      return false;
    }

    public bool Deactivate()
    {
      // TODO:  Add Pan.Deactivate implementation
      return true;
    }

    public void Refresh(int hdc)
    {
      // TODO:  Add Pan.Refresh implementation
    }

    public void OnDblClick()
    {
      // TODO:  Add Pan.OnDblClick implementation
    }

    #endregion
  }
}