using LYFZ.OtherExpansion.Win32;
using System;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Runtime.InteropServices;
using System.Windows.Forms;
namespace LYFZ.OtherExpansion.SkinControl
{
	public class RichEditOle
	{
		private SkinRichTextBox _richEdit;
		private IRichEditOle _richEditOle;
		public IRichEditOle IRichEditOle
		{
			get
			{
				if (this._richEditOle == null)
				{
					this._richEditOle = NativeMethods.SendMessage(this._richEdit.Handle, 1084, 0);
				}
				return this._richEditOle;
			}
		}
		public RichEditOle(SkinRichTextBox richEdit)
		{
			this._richEdit = richEdit;
		}
		public void InsertControl(Control control)
		{
			if (control != null)
			{
				Guid guid = Marshal.GenerateGuidForType(control.GetType());
				ILockBytes bytes;
				NativeMethods.CreateILockBytesOnHGlobal(IntPtr.Zero, true, out bytes);
				IStorage storage;
				NativeMethods.StgCreateDocfileOnILockBytes(bytes, 4114u, 0u, out storage);
				IOleClientSite site;
				this.IRichEditOle.GetClientSite(out site);
				REOBJECT lpreobject = new REOBJECT();
				lpreobject.cp = this._richEdit.TextLength;
				lpreobject.clsid = guid;
				lpreobject.pstg = storage;
				lpreobject.poleobj = Marshal.GetIUnknownForObject(control);
				lpreobject.polesite = site;
				lpreobject.dvAspect = 1u;
				lpreobject.dwFlags = 2u;
				lpreobject.dwUser = 1u;
				this.IRichEditOle.InsertObject(lpreobject);
				Marshal.ReleaseComObject(bytes);
				Marshal.ReleaseComObject(site);
				Marshal.ReleaseComObject(storage);
			}
		}
		public bool InsertImageFromFile(string strFilename)
		{
			ILockBytes bytes;
			NativeMethods.CreateILockBytesOnHGlobal(IntPtr.Zero, true, out bytes);
			IStorage storage;
			NativeMethods.StgCreateDocfileOnILockBytes(bytes, 4114u, 0u, out storage);
			IOleClientSite site;
			this.IRichEditOle.GetClientSite(out site);
			FORMATETC pFormatEtc = default(FORMATETC);
			pFormatEtc.cfFormat = (CLIPFORMAT)0;
			pFormatEtc.ptd = IntPtr.Zero;
			pFormatEtc.dwAspect = DVASPECT.DVASPECT_CONTENT;
			pFormatEtc.lindex = -1;
			pFormatEtc.tymed = TYMED.TYMED_NULL;
			Guid riid = new Guid("{00000112-0000-0000-C000-000000000046}");
			Guid rclsid = new Guid("{00000000-0000-0000-0000-000000000000}");
			object obj2;
			NativeMethods.OleCreateFromFile(ref rclsid, strFilename, ref riid, 1u, ref pFormatEtc, site, storage, out obj2);
			if (obj2 == null)
			{
				Marshal.ReleaseComObject(bytes);
				Marshal.ReleaseComObject(site);
				Marshal.ReleaseComObject(storage);
				return false;
			}
			IOleObject pUnk = (IOleObject)obj2;
			Guid pClsid = default(Guid);
			pUnk.GetUserClassID(ref pClsid);
			NativeMethods.OleSetContainedObject(pUnk, true);
			REOBJECT lpreobject = new REOBJECT();
			lpreobject.cp = this._richEdit.TextLength;
			lpreobject.clsid = pClsid;
			lpreobject.pstg = storage;
			lpreobject.poleobj = Marshal.GetIUnknownForObject(pUnk);
			lpreobject.polesite = site;
			lpreobject.dvAspect = 1u;
			lpreobject.dwFlags = 2u;
			lpreobject.dwUser = 0u;
			this.IRichEditOle.InsertObject(lpreobject);
			Marshal.ReleaseComObject(bytes);
			Marshal.ReleaseComObject(site);
			Marshal.ReleaseComObject(storage);
			Marshal.ReleaseComObject(pUnk);
			return true;
		}
		public REOBJECT InsertOleObject(IOleObject oleObject, int index)
		{
			if (oleObject == null)
			{
				return null;
			}
			ILockBytes pLockBytes;
			NativeMethods.CreateILockBytesOnHGlobal(IntPtr.Zero, true, out pLockBytes);
			IStorage pStorage;
			NativeMethods.StgCreateDocfileOnILockBytes(pLockBytes, 4114u, 0u, out pStorage);
			IOleClientSite pOleClientSite;
			this.IRichEditOle.GetClientSite(out pOleClientSite);
			Guid guid = default(Guid);
			oleObject.GetUserClassID(ref guid);
			NativeMethods.OleSetContainedObject(oleObject, true);
			REOBJECT reoObject = new REOBJECT();
			reoObject.cp = this._richEdit.TextLength;
			reoObject.clsid = guid;
			reoObject.pstg = pStorage;
			reoObject.poleobj = Marshal.GetIUnknownForObject(oleObject);
			reoObject.polesite = pOleClientSite;
			reoObject.dvAspect = 1u;
			reoObject.dwFlags = 2u;
			reoObject.dwUser = (uint)index;
			this.IRichEditOle.InsertObject(reoObject);
			Marshal.ReleaseComObject(pLockBytes);
			Marshal.ReleaseComObject(pOleClientSite);
			Marshal.ReleaseComObject(pStorage);
			return reoObject;
		}
		public void UpdateObjects()
		{
			int objectCount = this.IRichEditOle.GetObjectCount();
			for (int i = 0; i < objectCount; i++)
			{
				REOBJECT lpreobject = new REOBJECT();
				this.IRichEditOle.GetObject(i, lpreobject, GETOBJECTOPTIONS.REO_GETOBJ_ALL_INTERFACES);
				Point positionFromCharIndex = this._richEdit.GetPositionFromCharIndex(lpreobject.cp);
				Rectangle rc = new Rectangle(positionFromCharIndex.X, positionFromCharIndex.Y, 50, 50);
				this._richEdit.Invalidate(rc, false);
			}
		}
		public void UpdateObjects(int pos)
		{
			REOBJECT lpreobject = new REOBJECT();
			this.IRichEditOle.GetObject(pos, lpreobject, GETOBJECTOPTIONS.REO_GETOBJ_ALL_INTERFACES);
			this.UpdateObjects(lpreobject);
		}
		public void UpdateObjects(REOBJECT reObj)
		{
			Point positionFromCharIndex = this._richEdit.GetPositionFromCharIndex(reObj.cp);
			Size size = this.GetSizeFromMillimeter(reObj);
			Rectangle rc = new Rectangle(positionFromCharIndex, size);
			this._richEdit.Invalidate(rc, false);
		}
		private Size GetSizeFromMillimeter(REOBJECT lpreobject)
		{
			Size result;
			using (Graphics graphics = Graphics.FromHwnd(this._richEdit.Handle))
			{
				Point[] pts = new Point[1];
				graphics.PageUnit = GraphicsUnit.Millimeter;
				pts[0] = new Point(lpreobject.sizel.Width / 100, lpreobject.sizel.Height / 100);
				graphics.TransformPoints(CoordinateSpace.Device, CoordinateSpace.Page, pts);
				result = new Size(pts[0]);
			}
			return result;
		}
	}
}