IMEX.mes.wcf/DK.Basics/BaseControls/TextBox/C_TXT_DropDownList.cs

/*******************************************************************************
 * Copyright(c) 2014 DongkeSoft All rights reserved. / Confidential
 * 类的信息：
 *      1.程序名称：C_TXT_DropDownList.cs
 *      2.功能描述：扩展的控件
 * 编辑履历：
 *      作者            日期                版本            修改内容
 *      陈晓野          2014/09/29          1.00            新建
 *******************************************************************************/

using Dongke.IBOSS.PRD.Basics.Library;
using System;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Windows.Forms;

namespace Dongke.IBOSS.PRD.Basics.BaseControls
{
	public partial class C_TXT_DropDownList : DKTextBoxBase
    {
        #region 成员变量

        public ListBox _lstShowChoice = null;                       // 弹出的选择下拉选项
        private Color _lstForeColor = Color.Gray;                   // 弹出的选择下拉选项前景色
        private Color _lstBackColor = Color.Snow;                   // 弹出的选择下拉选项背景色
        private DataTable _dataSource;                              // 本控件的数据源
        private string _displayMember;                              // 控件下拉选择项显示的属性
        private string _valueMember;                                // 控件下拉选择项实际值的属性
        private bool _allowSpace = true;                            // 是否允许输入空格
        private bool _dropDownOnly = true;                          // 只能从下拉选项中选择值
        public int _originalLocation = 0;                           // 光标原来的位置
        public string _originalText = "";                           // 文本框原来的文本值
        public bool _isKeyDown = false;                             // 是否按下了键盘
        private object _selectedValue = "";                         // 下拉选择选中的值
        private object _selectedItem = "";
        private bool _IsOnlyShowValid = true;                       // 是否只显示有效数据
        private bool _isSetPosition = true;

        #endregion

        public C_TXT_DropDownList()
        {
            InitializeComponent();
            IsSetPosition = false;
            this.Leave += new EventHandler(dkDropDownList_Leave);
            this.KeyDown += new KeyEventHandler(dkDropDownList_KeyDown);
            this.KeyUp += new KeyEventHandler(dkDropDownList_KeyUp);
            this.DoubleClick += new EventHandler(dkDropDownList_DoubleClick);
        }

        public C_TXT_DropDownList(IContainer container)
        {
            container.Add(this);

            InitializeComponent();
            this.Leave += new EventHandler(dkDropDownList_Leave);
            this.KeyDown += new KeyEventHandler(dkDropDownList_KeyDown);
            this.KeyUp += new KeyEventHandler(dkDropDownList_KeyUp);
            this.DoubleClick += new EventHandler(dkDropDownList_DoubleClick);
        }

        #region 公开属性

        /// <summary>
        /// 设定或者取得本控件的数据源
        /// </summary>
        [Description("设定或者取得本控件的数据源")]
        public DataTable DataSource
        {
            get
            {
                return _dataSource;
            }
            set
            {
                _dataSource = (DataTable)SetFilter(value);
                ListBox lstBox = this.lstPrompt;
                if (lstBox != null)
                {
                    SetParentBySummary();
                    lstBox.DataSource = _dataSource;
                    lstBox.DisplayMember = _displayMember;
                    lstBox.ValueMember = _valueMember;
                }
            }
        }

        /// <summary>
        /// 设定或者获取控件是否可以输入空格
        /// </summary>
        [Description("设定或者获取控件是否可以输入空格")]
        [DefaultValue(true)]
        public bool AllowSpace
        {
            get
            {
                return _allowSpace;
            }
            set
            {
                _allowSpace = value;
            }
        }

        /// <summary>
        /// 设定或者获取控件是否只能从下拉选项中选择值
        /// </summary>
        [Description("设定或者获取控件是否只能从下拉选项中选择值")]
        [DefaultValue(true)]
        public bool DropDownOnly
        {
            get
            {
                return _dropDownOnly;
            }
            set
            {
                _dropDownOnly = value;
            }
        }

        /// <summary>
        /// 指示要为下拉选择项显示的属性
        /// </summary>
        [Description("指示要为下拉选择项显示的属性")]
        public string DisplayMember
        {
            get
            {
                return _displayMember;
            }
            set
            {
                _displayMember = value;
            }
        }

        /// <summary>
        /// 指示要为下拉选择项实际值的属性
        /// </summary>
        [Description("指示要为下拉选择项实际值的属性")]
        public string ValueMember
        {
            get
            {
                return _valueMember;
            }
            set
            {
                _valueMember = value;
            }
        }

        /// <summary>
        /// 控件的值
        /// </summary>
        [Description("取得和设定与控件关联的值，即valueMember对应的值")]
        public object SelectedValue
        {
            get
            {
                return _selectedValue;
            }
            set
            {
                _selectedValue = value;

                if (string.IsNullOrEmpty(value + ""))
                {
                    this.Text = string.Empty;
                }

                if (_selectedValue != null && _selectedValue.ToString() != "" && this.DataSource != null)
                {
                    DataTable tempTable = this.DataSource.Copy();
                    DataRow[] dataRows = tempTable.Select(ValueMember.ToUpper() + " = '" + this._selectedValue + "'");
                    if (dataRows.Length == 1)
                    {
                        this.Text = dataRows[0][DisplayMember] as string;
                    }
                }
            }
        }

        /// <summary>
        /// 重新设置位置
        /// </summary>
        [DefaultValue(true)]
        public bool IsSetPosition
        {
            set
            {
                _isSetPosition = value;
            }
            get
            {
                return _isSetPosition;
            }
        }

        /// <summary>
        /// 是否只显示有效数据
        /// </summary>
        [Description("设置控件是否只显示有效数据。")]
        [DefaultValue(true)]
        public bool IsOnlyShowValid
        {
            get
            {
                return _IsOnlyShowValid;
            }
            set
            {
                _IsOnlyShowValid = value;
            }
        }

        public ListBox lstPrompt
        {
            get
            {
                //如果没有列表用于显示提示的列表框，则创建一个
                if ((_lstShowChoice == null) && this.Parent != null)
                {

                    _lstShowChoice = new ListBox();
                    _lstShowChoice.Visible = false;//false

                    _lstShowChoice.Left = this.Left;
                    _lstShowChoice.Top = this.Bottom;
                    _lstShowChoice.Width = this.Width;
                    _lstShowChoice.TabStop = false;
                    _lstShowChoice.Sorted = true;
                    _lstShowChoice.ForeColor = this._lstForeColor;					// 前景色
                    _lstShowChoice.BackColor = this._lstBackColor;				// 背景色
                    _lstShowChoice.BorderStyle = BorderStyle.FixedSingle;

                    IsSetPosition = false;

                    //如果提示框过低，则显示到上面
                    if (_lstShowChoice.Bottom > this.Parent.Height)
                    {
                        _lstShowChoice.Top = this.Top - _lstShowChoice.Height + 8;
                    }
                    if (!IsSetPosition)
                    {
                        this.Parent.Controls.Add(_lstShowChoice);
                        this.Parent.ResumeLayout(false);
                        //this.Controls.Add(_lstShowChoice);
                        //this.ResumeLayout(false);
                    }
                    // 注册鼠标移动、点击事件
                    _lstShowChoice.MouseUp += new MouseEventHandler(lstBox_MouseUp);
                    _lstShowChoice.MouseMove += new MouseEventHandler(lstBox_MouseMove);

                    //this.Parent.Controls.Add(_lstShowChoice);
                    //this.Parent.ResumeLayout(false);
                    _lstShowChoice.BringToFront();
                }
                return _lstShowChoice;
            }
        }

        //void _lstShowChoice_DrawItem(object sender, DrawItemEventArgs e)
        //{
        //    _lstShowChoice.DrawMode = DrawMode.OwnerDrawFixed;
        //    e.DrawBackground();
        //    Brush myBrush = Brushes.Black;
        //    FontFamily fontFamily = new FontFamily("宋体");
        //    System.Drawing.Font myFont = new Font(fontFamily,10);
        //    if ((e.State & DrawItemState.Selected) == DrawItemState.Selected)
        //    {
        //        //e.Graphics.FillRectangle(Brushes.Blue, e.Bounds);
        //        if (e.Index > -1)
        //        {
        //            e.Graphics.DrawString(_lstShowChoice.Items[e.Index].ToString(), myFont, Brushes.White, e.Bounds, StringFormat.GenericDefault);
        //        }
        //    }
        //    else
        //    {
        //        //e.Graphics.FillRectangle(Brushes.White, e.Bounds);
        //        if (e.Index > -1)
        //        {
        //            e.Graphics.DrawString(_lstShowChoice.Items[e.Index].ToString(), myFont, myBrush, e.Bounds, StringFormat.GenericDefault);
        //        }
        //    }
        //    e.DrawFocusRectangle();

        //}


        /// <summary>
        /// 弹出的选择下拉选项前景色
        /// </summary>
        [Description("取得和设定弹出的选择下拉选项前景色")]
        public Color PromptForeColor
        {
            get
            {
                return _lstForeColor;
            }
            set
            {
                _lstForeColor = value;
                ListBox lstBox = this.lstPrompt;
                SetParentBySummary();
                if (lstBox != null)
                {
                    lstBox.ForeColor = _lstForeColor;
                }
            }

        }

        /// <summary>
        /// 弹出的选择下拉选项背景色
        /// </summary>
        [Description("取得和设定弹出的选择下拉选项背景色")]
        public Color PromptBackColor
        {
            get
            {
                return _lstBackColor;
            }
            set
            {
                _lstBackColor = value;
                ListBox lstBox = this.lstPrompt;

                if (lstBox != null)
                {
                    SetParentBySummary();
                    lstBox.BackColor = _lstBackColor;
                }
            }
        }

        #endregion

        #region 私有方法或者函数

        /// <summary>
        /// 鼠标点击下拉选择项时，选中处理
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void lstBox_MouseUp(object sender, MouseEventArgs e)
        {
            if (_selectedItem != null)
            {
                DataRowView dataRowView = _selectedItem as DataRowView;
                if (dataRowView != null)
                {
                    this.Text = dataRowView[_displayMember].ToString();
                    this._selectedValue = dataRowView[_valueMember].ToString();
                }
                this.SelectionStart = this.Text.Length;

                //选择后文本框失去了焦点，这里移回来
                this.Focus();
            }
        }

        /// <summary>
        /// 鼠标经过下拉选择项时，选中处理
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void lstBox_MouseMove(object sender, MouseEventArgs e)
        {
            ListBox lstBox = (ListBox)sender;
            Point point = new Point(e.X, e.Y);
            int n = lstBox.IndexFromPoint(point);
            if (n >= 0)
            {
                lstBox.SelectedIndex = n;
                _selectedItem = lstBox.SelectedItem;
            }
        }

        /// <summary>
        /// 在本控件中按下了键盘的任何键
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void dkDropDownList_KeyDown(object sender, KeyEventArgs e)
        {
            //_lstShowChoice.Visible = true;
            if (_lstShowChoice != null)
            {
                _lstShowChoice.Visible = true;
            }
            _originalLocation = this.SelectionStart;
            _isKeyDown = true;
            _originalText = this.Text;
        }

        /// <summary>
        /// 在本控件中按下了键盘的任何键，进行匹配处理
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void dkDropDownList_KeyUp(object sender, KeyEventArgs e)
        {
            if (!_isKeyDown)
            {
                return;
            }
            // 将按下键标识置回原始状态
            _isKeyDown = false;
            ListBox lstBox = this.lstPrompt;
            //SetParentBySummary();
            switch (e.KeyCode)
            {
                // 通过上下箭头在待选框中移动
                case Keys.Up:
                case Keys.Down:
                    if ((lstBox != null) && !this.Multiline)						// 多行文本通过上下箭头在两行之间移动
                    {
                        if ((e.KeyCode == Keys.Up) && (lstBox.SelectedIndex > -1))		// ↑
                        {
                            lstBox.SelectedIndex--;
                        }
                        else if ((e.KeyCode == Keys.Down) && (lstBox.SelectedIndex < lstBox.Items.Count - 1)) //↑
                        {
                            lstBox.SelectedIndex++;
                        }

                        //上下箭头不能移动当前光标，因此，还原原来位置
                        this.SelectionStart = _originalLocation;

                        //显示提示框
                        if (!lstBox.Visible)
                        {
                            if (lstBox.Width != this.Width)
                            {
                                lstBox.Width = this.Width;
                            }
                            lstBox.Visible = true;
                        }
                    }
                    break;
                case Keys.Escape:				// ESC隐藏提示
                    this.Text = string.Empty;
                    this._selectedValue = string.Empty;
                    if ((lstBox != null) && lstBox.Visible)
                    {
                        lstBox.Hide();
                    }
                    break;
                case Keys.Return:					// 回车选择一个或跳到下一控件
                    if ((lstBox == null) || this.Multiline)
                    {
                        break;
                    }
                    // 没有显示提示框时，移动到下一控件
                    if (!lstBox.Visible)
                    {
                        SendKeys.Send("{TAB}");
                    }
                    else			// 有提示，关闭提示
                    {
                        if (lstBox.SelectedIndex > -1)			// 有选择，使用当前选择的内容
                        {
                            DataRowView dataRowView = lstBox.SelectedItem as DataRowView;
                            if (dataRowView != null)
                            {
                                this.Text = dataRowView[_displayMember].ToString();
                                this._selectedValue = dataRowView[_valueMember].ToString();
                            }
                        }
                        this.SelectionStart = this.Text.Length;
                        this.SelectAll();
                        lstBox.Hide();
                    }
                    break;
                // 按delete键清空
                case Keys.Delete:
                    this.Text = string.Empty;
                    this._selectedValue = string.Empty;
                    if ((lstBox != null) && lstBox.Visible)
                    {
                        lstBox.Hide();
                    }
                    break;
                default:			// 判断文本是否改变
                    string textString = this.Text;
                    // 不允许产生空格，去掉文本中的空格
                    if (!this.AllowSpace)
                    {
                        textString = this.Text.Replace(" ", "");
                    }
                    int nStart = this.SelectionStart;

                    if (textString != _originalText)			// 文本有改变
                    {
                        // 设置当前文本和键盘光标位置
                        this.Text = textString;
                        if (nStart > this.Text.Length)
                        {
                            nStart = this.Text.Length;
                        }
                        this.SelectionStart = nStart;

                        //修改可供选择的内容,并显示供选择的列表框
                        if (lstBox != null)
                        {

                            FillPrompt(textString);
                            if (!lstBox.Visible)
                            {
                                if (lstBox.Width != this.Width)
                                {
                                    lstBox.Width = this.Width;
                                }
                                lstBox.Visible = true;
                            }
                        }
                    }
                    break;
            }
        }

        /// <summary>
        /// 为下拉选择赋值
        /// </summary>
        /// <param name="searchText">匹配内容</param>
        private void FillPrompt(string searchText)
        {
            //return;
            ListBox lstBox = this.lstPrompt;
            if (lstBox != null && _dataSource != null)
            {
                SetParentBySummary();
                //BY 赵含 编号：C帐套补充一览105、106
                // string filter = DisplayMember + " LIKE '%" + Utility.SelectFilterLike(searchText) + "%'";
                //string filter = Utility.SelectFilterLike(searchText);
                string filter = DisplayMember + " LIKE '%" + (Utility.SelectFilterLike(this.Text)).Replace(@"*", @"[*]") + "%'";
                // string filter = DisplayMember + " LIKE '%" + searchText + "%'";

                _dataSource.DefaultView.RowFilter = filter;
                DataTable returnTable = _dataSource.DefaultView.ToTable();
                lstBox.DataSource = returnTable;
                lstBox.Refresh();
                _selectedItem = lstBox.SelectedItem;
            }
        }

        /// <summary>
        /// 下拉选择项失去焦点处理
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void dkDropDownList_Leave(object sender, EventArgs e)
        {
            //return;
            ListBox lstBox = this.lstPrompt;
            // 对于只选字段,必须输入同待选相匹配的值
            if (this.DropDownOnly && _dataSource != null)
            {
                //BY 赵含 编号：C帐套补充一览105、106
                //string filter = DisplayMember + " LIKE '%" + Utility.SelectFilterLike(this.Text) + "%'";
                string filter = DisplayMember + " LIKE '%" + (Utility.SelectFilterLike(this.Text)).Replace(@"*", @"[*]") + "%'";
                _dataSource.DefaultView.RowFilter = filter;
                DataTable returnTable = _dataSource.DefaultView.ToTable();

                if (returnTable.Rows.Count > 0)
                {
                    DataRowView dataRowView = _selectedItem as DataRowView;

                    if (lstBox != null && lstBox.Visible)
                    {
                        if (dataRowView != null)
                        {
                            this.Text = dataRowView[DisplayMember] + "";
                            this._selectedValue = dataRowView[ValueMember] + "";
                        }
                        else
                        {
                            this.Text = returnTable.Rows[0][DisplayMember] + "";
                            this._selectedValue = returnTable.Rows[0][ValueMember];
                        }
                    }
                    else
                    {
                        //this.Text = "";
                        //this._selectedValue = null;
                    }
                }
                else
                {
                    this.Text = "";
                    this._selectedValue = null;
                }
            }

            // 失去焦点后，必须隐藏提示
            lstBox = this.lstPrompt;
            if (lstBox != null)
            {
                lstBox.Visible = false;
            }
        }

        /// <summary>
        /// 本控件双击事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void dkDropDownList_DoubleClick(object sender, EventArgs e)
        {
            if (this.ReadOnly || !this.Enabled)
            {
                return;
            }
            ListBox lstBox = this.lstPrompt;
            FillPrompt(this.Text);
            if ((lstBox != null) && (!lstBox.Visible))
            {
                SetParentBySummary();
                if (lstBox.Width != this.Width)
                {
                    lstBox.Width = this.Width;
                }
                lstBox.Visible = true;
            }
        }

        /// <summary>
        /// 过滤数据源
        /// </summary>
        /// <param name="dataSource"></param>
        /// <returns></returns>
        protected object SetFilter(object dataSource)
        {
            //string filter = "ValueFlag = 1";
            if (dataSource is BindingSource)
            {
                BindingSource bSource = (BindingSource)dataSource;
                // 若设置了只显示有效数据
                if (this._IsOnlyShowValid == true)
                {
                    //bSource.Filter = filter;
                }
                dataSource = bSource;
            }
            else if (dataSource is DataTable)
            {
                DataTable dtbl = (DataTable)dataSource;
                // 若设置了只显示有效数据
                if (this._IsOnlyShowValid == true)
                {
                    //dtbl.DefaultView.RowFilter = filter;
                }
                dataSource = dtbl.DefaultView.ToTable();
            }
            return dataSource;
        }

        /// <summary>
        /// 科目汇总时使用
        /// </summary>
        private void SetParentBySummary()
        {
            // 周兴 2018-4-7 注释
            //if (this.Parent != null && IsSetPosition)
            if (this.Parent != null)
            {
                _lstShowChoice.Left = this.Left + this.Parent.Left;
                _lstShowChoice.Top = this.Bottom + this.Parent.Top;
                Control control = this.Parent.Parent;
                if (control != null)
                {
                    control.Controls.Add(_lstShowChoice);
                    control.ResumeLayout(false);
                    _lstShowChoice.BringToFront();
                }
            }
        }

        #endregion
    }
}