using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using vjsdn.EasyEdit.Business;
using System.Diagnostics;

namespace CSFramework.EasyEdit
{
   public partial class frmMain : Form
   {
      private bllUser _BLL = new bllUser();
      private OperateType _TYPE = OperateType.Browse;
      
      //操作类型，新增/修改/显示数据
      private enum OperateType
      {
         Add,
         Edit,
         Browse
      }
      
      public frmMain()
      {
         InitializeComponent();
      }
      
      private void frmMain_Load(object sender, EventArgs e)
      {
         bllService.SetDataBasePath(); //因用到Access,指定一个MDB文件
         
         this.SetEditMode(false);
         
         //打开窗体时显示所有数据.
         //当处理大数据时可初始化查询条件或查询少量数据
         btnQuery.PerformClick();
      }
      
      private void btnQuery_Click(object sender, EventArgs e)
      {
         dataGridView1.DataSource = null;
         DataTable dt = _BLL.Search(txt_UserID.Text, txt_UserName.Text);
         dataGridView1.DataSource = dt;
      }
      
      //数据操作两种状态.1：数据修改状态 2：查看数据状态
      private void SetEditMode(bool isEdit)
      {
         btnAdd.Enabled = !isEdit;
         btnEdit.Enabled = !isEdit;
         btnQuery.Enabled = !isEdit;
         btnDelete.Enabled = !isEdit;
         btnView.Enabled = !isEdit;
         btnSave.Enabled = isEdit;
         btnCancel.Enabled = isEdit;
         
         txtUserID.Enabled = isEdit;
         txtUserName.Enabled = isEdit;
      }
      
      private void btnAdd_Click(object sender, EventArgs e)
      {
         _TYPE = OperateType.Add;
         this.ShowData(false);
         this.ShowDetailPage();
         this.SetEditMode(true);
      }
      
      private void btnEdit_Click(object sender, EventArgs e)
      {
         if (dataGridView1.CurrentRow != null)
         {
            _TYPE = OperateType.Edit;
            this.ShowData(true);
            this.ShowDetailPage();
            this.SetEditMode(true);
         }
         else
         MessageBox.Show("没有选择要修改的记录!");
      }
      
      private void ShowData(bool bindData)
      {
         txtUserID.Clear();
         txtUserName.Clear();
         
         if (bindData && dataGridView1.CurrentRow != null)
         {
            DataRow dr = (dataGridView1.CurrentRow.DataBoundItem as DataRowView).Row;
            txtUserID.Text = dr["UserID"].ToString();
            txtUserName.Text = dr["UserName"].ToString();
         }
         
         txtUserID.Focus();
      }
      
      private void btnSave_Click(object sender, EventArgs e)
      {
         try
         {
            bool ret = false; //保存结果
            
            DataRow data = CreateRow();
            
            if (_TYPE == OperateType.Add)
            ret = _BLL.AddUser(data);
            else if (_TYPE == OperateType.Edit)
            ret = _BLL.UpdateUser(data);
            
            if (ret) //保存成功
            {
               _TYPE = OperateType.Browse;
               SetEditMode(false);
               this.ShowDetailPage();
               
               btnQuery.PerformClick();//刷新数据
            }
            else
            {
               MessageBox.Show("保存失败");
            }
         }
         catch (Exception ex)
         {
            MessageBox.Show(ex.Message);
         }
      }
      
      //创建一个DataRow,用于保存数据
      //严格要求的话这里应该要使用数据模型，如建立一个User类
      //本文重点是演示增删改查，所以忽略了数据模型.
      //易学网 http://www.vjsdn.com/bbs/bbsTopicDetails.aspx?pid=587
      //这个帖内讲到三层体系结构应用实例
      private DataRow CreateRow()
      {
         DataRow row = this.GetCurrentRow();
         row["UserID"] = txtUserID.Text;
         row["UserName"] = txtUserName.Text;
         return row;
      }
      
      //获取表格中选择的记录DataRow
      private DataRow GetCurrentRow()
      {
         if (dataGridView1.CurrentRow == null) return null;
         
         DataRowView dv = dataGridView1.CurrentRow.DataBoundItem as DataRowView;
         return dv.Row;
      }
      
      private void btnCancel_Click(object sender, EventArgs e)
      {
         if (AskQuestion("确定要取消吗?"))
         {
            _TYPE = OperateType.Browse;
            SetEditMode(false);
            this.ShowDetailPage();
         }
      }
      
      private bool AskQuestion(string msg)
      {
         return DialogResult.Yes == MessageBox.Show(msg, "易学网 (www.vjsdn.com)", MessageBoxButtons.YesNo);
      }
      
      private void btnDelete_Click(object sender, EventArgs e)
      {
         if (AskQuestion("确定要删除吗?"))
         {
            DataRow row = this.GetCurrentRow();
            if (row == null) return;
            
            bool ret = _BLL.DeleteUser(row["UserID"].ToString());
            if (ret)
            MessageBox.Show("删除成功");
            else
            MessageBox.Show("删除失败!");
            
            btnQuery.PerformClick();
         }
      }
      
      private void btnAbout_Click(object sender, EventArgs e)
      {
         new frmAboutVjsdn().Show();
      }
      
      private void btnVJSDN_Click(object sender, EventArgs e)
      {
         Process.Start("http://www.vjsdn.com");
      }
      
      private void ShowSummaryPage()
      {
         tabControl1.SelectedIndex = 0;
      }
      
      private void ShowDetailPage()
      {
         tabControl1.SelectedIndex = 1;
         
         if (_TYPE == OperateType.Add)
         lblState.Text = "新增数据 Add Data Mode";
         
         if (_TYPE == OperateType.Edit)
         lblState.Text = "修改数据 Edit Data Mode";
         
         if (_TYPE == OperateType.Browse)
         lblState.Text = "显示数据 Browse Data Mode";
      }
      
      private void btnView_Click(object sender, EventArgs e)
      {
         if (dataGridView1.CurrentRow != null)
         {
            _TYPE = OperateType.Browse;
            this.ShowData(true);
            this.ShowDetailPage();
            this.SetEditMode(false);
         }
         else
         MessageBox.Show("没有选择要修改的记录!");
      }
   }
}