// 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 ESRI.ArcGIS.Carto;
using ESRI.ArcGIS.Geometry;
using ESRI.ArcGIS.esriSystem;
using ESRI.ArcGIS.Controls;
using ESRI.ArcGIS.ADF.BaseClasses;
using ESRI.ArcGIS.ADF.CATIDs;
using System.Runtime.InteropServices;

namespace ZoomFactorExtensionCSharp
{
  [ClassInterface(ClassInterfaceType.None)]
  [Guid("38ec31b1-a442-4231-b304-afe32f186fa2")]
  public sealed class ZoomOut: BaseCommand
  {
    //The HookHelper object that deals with the hook passed to the OnCreate event
    private IHookHelper m_HookHelper = new HookHelperClass();

    #region "Component Category Registration"
    [ComRegisterFunction()]
    static void Reg(string regKey)
    {
      ControlsCommands.Register(regKey);
    }

    [ComUnregisterFunction()]
    static void Unreg(string regKey)
    {
      ControlsCommands.Unregister(regKey);
    }
    #endregion

    public ZoomOut()
    {
      //Set the command properties      
      base.m_caption = "Variable Zoom Out";
      base.m_message = "Variable Zoom Out";
      base.m_toolTip = "Variable Zoom Out";
      base.m_category = "ZoomExtension Sample(CSharp)";
      base.m_name = "ZoomExtension Sample(CSharp)_Variable Zoom Out";
      base.m_bitmap = new System.Drawing.Bitmap(GetType().Assembly.GetManifestResourceStream("Commands.zoomoutfxd.bmp"));
    }
  
    public override void OnCreate(object hook)
    {
      m_HookHelper.Hook = hook;
    }
    
    public override bool Enabled
    {
      get
      {
        //Get the extension manager
        IExtensionManager extensionManager = new ExtensionManagerClass();

        //Get the extension from the extension manager
        IExtension extension = extensionManager.FindExtension("Zoom Factor Extension");

        //Get the state of the extension
        IExtensionConfig extensionConfig = (IExtensionConfig) extension;
        if (extensionConfig != null)
        {
          if (extensionConfig.State == esriExtensionState.esriESEnabled) return true;
          else return false;
        }
        else
        {
          return false;
        }
      }
    }

    public override void OnClick()
    {
      //Get the current extent of the active view
      IActiveView activeView = m_HookHelper.ActiveView;
      IEnvelope envelope = activeView.Extent;

      //Get the extension manager
      ExtensionManager extensionManager = new ExtensionManagerClass();
      //Get the extension from the extension manager
      IExtension extension = extensionManager.FindExtension("Zoom Factor Extension");

      //Get the zoom factor from the extension
      double zoomFactor = 1.1;
      if (extension != null)
      {
        IZoomExtension zoomExtension = (IZoomExtension) extension;
        zoomFactor = zoomExtension.ZoomFactor;
      }
      else
      {
        System.Windows.Forms.MessageBox.Show("The extension cannot be found!");
      }

      //Update the current extent of the active view
      envelope.Expand(zoomFactor,zoomFactor,true);
      activeView.Extent = envelope;
      activeView.Refresh();
    }
  }
}