GHZLangChao/Assets/LangChaoRTC/Paroxe/PDFRenderer/API/Action/PDFDest.cs

using System;
using Paroxe.PdfRenderer.Internal;

namespace Paroxe.PdfRenderer
{
#if !UNITY_WEBGL
    /// <summary>
    /// Represents a destination into a PDF document.
    /// </summary>
    public class PDFDest : IDisposable
    {
        private bool m_Disposed;
        private IntPtr m_NativePointer;
        private IDisposable m_Source;
        private PDFDocument m_Document;
        private int m_PageIndex = -1;

        public PDFDest(PDFAction action, IntPtr nativePointer)
        {
            if (action == null)
                throw new NullReferenceException();
            if (nativePointer == IntPtr.Zero)
                throw new NullReferenceException();

            PDFLibrary.AddRef("PDFDest");

            m_Source = action;
            m_Document = action.Document;

            m_NativePointer = nativePointer;
        }

        public PDFDest(PDFLink link, IntPtr nativePointer)
        {
            if (link == null)
                throw new NullReferenceException();
            if (nativePointer == IntPtr.Zero)
                throw new NullReferenceException();

            PDFLibrary.AddRef("PDFDest");

            m_Source = link;
            m_Document = link.Page.Document;

            m_NativePointer = nativePointer;
        }

        public PDFDest(PDFBookmark bookmark, IntPtr nativePointer)
        {
            if (bookmark == null)
                throw new NullReferenceException();
            if (nativePointer == IntPtr.Zero)
                throw new NullReferenceException();

            PDFLibrary.AddRef("PDFDest");

            m_Source = bookmark;
            m_Document = bookmark.Document;

            m_NativePointer = nativePointer;
        }

        ~PDFDest()
        {
            Dispose(false);
        }

        public void Dispose()
        {
            Dispose(true);
            GC.SuppressFinalize(this);
        }

        protected virtual void Dispose(bool disposing)
        {
            if (!m_Disposed)
            {
                m_NativePointer = IntPtr.Zero;

                PDFLibrary.RemoveRef("PDFDest");

                m_Disposed = true;
            }
        }

        public PDFDocument Document
        {
            get { return m_Document; }
        }

        public IDisposable Source
        {
            get { return m_Source; }
        }

        public IntPtr NativePointer
        {
            get { return m_NativePointer; }
        }

        public int PageIndex
        {
            get
            {
                if (m_PageIndex < 0)
                    m_PageIndex = (int)NativeMethods.FPDFDest_GetDestPageIndex(m_Document.NativePointer, m_NativePointer);
                return m_PageIndex;
            }
        }
    }
#endif
}