using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Linq;
using System.Threading.Tasks;
using System.Windows.Forms;
using DevExpress.XtraEditors;
using System.IO;
using ProjectBase.Data.Logs;

namespace ProjectBase.Controls.DocViewer
{
    /// <summary>
    /// PDF测试显示窗体
    /// </summary>
    public partial class FrmPDFView : DevExpress.XtraEditors.XtraForm
    {
        /// <summary>
        /// 加载流数据
        /// </summary>
        public Stream Stream { get; set; }

        /// <summary>
        /// 文件后缀名，如.pdf
        /// </summary>
        public string Extension { get; set; }

        /// <summary>
        /// 文档文件路径。如果指定了该属性，可以不用设置Stream和Extension属性。
        /// </summary>
        public string FilePath { get; set; }

        /// <summary>
        /// 是否显示打开文件按钮
        /// </summary>
        public bool ShowBtnOpenFile
        {
            get { return m_ShowBtnOpenFile; }
            set
            {
                m_ShowBtnOpenFile = value;
                this.btnOpenFile.Visible = this.ShowBtnOpenFile;
            }
        }

        //记录窗体的名称
        readonly string mainFormText;
        private bool m_ShowBtnOpenFile = false;//是否显示打开文件按钮

        public FrmPDFView()
        {
            InitializeComponent();

            //记录窗体的名称，并实现文档变化事件的处理，方便显示新的文件名称
            mainFormText = this.Text;
            pdfViewer1.DocumentChanged += new DevExpress.XtraPdfViewer.PdfDocumentChangedEventHandler(pdfViewer1_DocumentChanged);
        }

        /// <summary>
        /// PDF文档变化后，实现对新文件名称的显示
        /// </summary>
        void pdfViewer1_DocumentChanged(object sender, DevExpress.XtraPdfViewer.PdfDocumentChangedEventArgs e)
        {
            string fileName = Path.GetFileName(e.DocumentFilePath);
            if (String.IsNullOrEmpty(fileName))
            {
                Text = mainFormText;
            }
            else
            {
                Text = fileName + " - " + mainFormText;
            }
        }

        private void FrmPDFView_Load(object sender, EventArgs e)
        {
            //如果文件流不为空，首先根据Stream对象加载文档，否则根据文件路径进行加载
            if (!this.DesignMode)
            {
                if (this.Stream != null)
                {
                    #region MyRegion
                    try
                    {
                        this.pdfViewer1.LoadDocument(this.Stream);
                    }
                    catch (Exception ex)
                    {
                        DevExpress.XtraEditors.XtraMessageBox.Show("加载PDF文件失败", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                        LogHelper.log.Error(string.Format("加载PDF文件失败，错误为{0}", ex.ToString()));
                    }
                    #endregion
                }
                else if (!string.IsNullOrEmpty(FilePath))
                {
                    this.pdfViewer1.LoadDocument(this.FilePath);
                }
            }
        }

        /// <summary>
        /// 打开PDF文件
        /// </summary>
        private void btnOpenFile_Click(object sender, EventArgs e)
        {
            string filePath;
            OpenFileDialog dialog = new OpenFileDialog();
            dialog.Filter = "PDF(*.pdf)|*.pdf|All File(*.*)|*.*";
            dialog.Title = "PDF选择";
            dialog.RestoreDirectory = true;
            dialog.FileName = null;

            if (dialog.ShowDialog() == DialogResult.OK)
            {
                filePath = dialog.FileName;
            }
            else
            {
                filePath = string.Empty;
            }

            if (!string.IsNullOrEmpty(filePath))
            {
                this.pdfViewer1.LoadDocument(filePath);
            }
        }

        /// <summary>
        /// 另存为PDF文件
        /// </summary>
        private void btnSaveAs_Click(object sender, EventArgs e)
        {
            string dir = System.Environment.CurrentDirectory;
            string filePath = null;
            SaveFileDialog dialog = new SaveFileDialog();
            dialog.Filter = "PDF(*.pdf)|*.pdf|All File(*.*)|*.*";
            dialog.Title = "保存Pdf";
            dialog.FileName = "";
            dialog.RestoreDirectory = true;
            if (!string.IsNullOrEmpty(dir))
            {
                dialog.InitialDirectory = dir;
            }

            if (dialog.ShowDialog() == DialogResult.OK)
            {
                filePath = dialog.FileName;
            }
            if (!string.IsNullOrEmpty(filePath))
            {
                try
                {
                    this.pdfViewer1.SaveDocument(filePath);
                    DevExpress.XtraEditors.XtraMessageBox.Show("保存PDF文件成功", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    this.Close();
                }
                catch (Exception ex)
                {
                    DevExpress.XtraEditors.XtraMessageBox.Show("保存PDF文件失败", "提示", MessageBoxButtons.OK, MessageBoxIcon.Information);
                    LogHelper.log.Error(string.Format("保存PDF文件失败，错误为{0}", ex.ToString()));
                }
            }
        }

        /// <summary>
        /// PDF文件打印
        /// </summary>
        private void btnPreview_Click(object sender, EventArgs e)
        {
            this.pdfViewer1.Print();
        }

        private void btnClose_Click(object sender, EventArgs e)
        {
            this.Close();
        }
    }
}