IMEX.mes.wcf/DK.Basics/BaseControls/UserControls/DKCheckBoxComboBox/DKListBoxComboBox.cs

/*******************************************************************************
 * Copyright(c) 2014 DongkeSoft All rights reserved. / Confidential
 * 类的信息：
 *      1.程序名称：DKListBoxComboBox.cs
 *      2.功能描述：下拉列表控件：根据输入内容进行模糊查询
 * 编辑履历：
 *      作者            日期                版本            修改内容
 *      陈晓野          2014/09/04          1.00            新建
 *******************************************************************************/

using System;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Windows.Forms;

using Dongke.IBOSS.PRD.Basics.Library;

namespace Dongke.IBOSS.PRD.Basics.BaseControls
{
    /// <summary>
    /// 下拉列表控件：根据输入内容进行模糊查询
    /// </summary>
    public partial class DKListBoxComboBox : PopupComboBox
    {
        #region 委托声明
        #endregion

        #region 事件声明
        #endregion

        #region 常量
        #endregion

        #region 成员变量
        ListControlContainer _containerControl = null;
        /// <summary>
        /// 多选控件
        /// </summary>
        private C_ListBox _listBox;
        /// <summary>
        /// 只能从下拉选项中选择值
        /// </summary>
        private bool _dropDownOnly = true;
        /// <summary>
        /// 下拉列表显示中
        /// </summary>
        private bool _isDropDownShowing = false;
        /// <summary>
        /// 下拉列表显示状态
        /// </summary>
        private bool _isDropDownClose = true;
        /// <summary>
        /// Form事件设定
        /// </summary>
        private bool _isSetting = false;

        #endregion

        #region 构造函数

        /// <summary>
        /// 构造函数
        /// </summary>
        public DKListBoxComboBox()
            : base()
        {
            InitializeComponent();

            this._listBox = new C_ListBox();
            this._containerControl = new ListControlContainer();
            this._containerControl.Controls.Add(this._listBox);
            this._containerControl.Padding = new Padding(0, 0, 0, 12);
            this._listBox.Dock = DockStyle.Fill;
            this._listBox.IntegralHeight = false;
            this.DropDownControl = this._containerControl;

            this.dropDown.Resizable = true;
            this.dropDown.FocusOnOpen = false;
            this.dropDown.AutoClose = false;
            this.dropDown.Opening += this.dropDown_Opening;
            this.dropDown.Closed += this.dropDown_Closed;

            this._listBox.SelectedIndexChanged += this.ListBox_SelectedIndexChanged;

            this.Leave += this.DKListBoxComboBox_Leave;
            this.KeyDown += this.DKListBoxComboBox_KeyDown;
            this.TextChanged += this.DKListBoxComboBox_TextChanged;
            this.KeyUp += this.DKListBoxComboBox_KeyUp;

            this.LocationChanged += this.DKListBoxComboBox_LocationChanged;
            this.SizeChanged += this.DKListBoxComboBox_SizeChanged;

            //this.DropDown += DKListBoxComboBox_DropDown;
            //this.DropDownClosed += DKListBoxComboBox_DropDownClosed;
        }

        void ShowCbDropDown()
        {
            //this.OnDropDown(null);
            this.ShowDropDown();
        }
        void HideCbDropDown()
        {
            //this.OnDropDownClosed(null);
            this.HideDropDown();
        }

        //void DKListBoxComboBox_DropDownClosed(object sender, EventArgs e)
        //{
        //    try
        //    {
        //        this.HideDropDown();
        //    }
        //    catch (Exception ex)
        //    {
        //        throw ex;
        //    }
        //}

        //void DKListBoxComboBox_DropDown(object sender, EventArgs e)
        //{
        //    try
        //    {
        //        this.ShowDropDown();
        //    }
        //    catch (Exception ex)
        //    {
        //        throw ex;
        //    }
        //}

        #endregion

        #region 单例模式
        #endregion

        #region 属性
        
        /// <summary>
        /// 获取或设置控件的数据源
        /// </summary>
        public new DataTable DataSource
        {
            get
            {
                return this._listBox.DataSource as DataTable;
            }
            set
            {
                this._listBox.DataSource = value;
            }
        }

        /// <summary>
        /// 获取或设置一个字符串，该字符串指定要显示其内容的列表框中所含对象的属性
        /// </summary>
        public new string DisplayMember
        {
            get
            {
                return this._listBox.DisplayMember;
            }
            set
            {
                this._listBox.DisplayMember = value;
            }
        }

        /// <summary>
        /// 获取或设置一个字符串，该字符串指定要从中取值的数据源的属性
        /// </summary>
        public new string ValueMember
        {
            get
            {
                return this._listBox.ValueMember;
            }
            set
            {
                this._listBox.ValueMember = 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 this._dropDownOnly;
            }
            set
            {
                this._dropDownOnly = value;
            }
        }

        /// <summary>
        /// Items
        /// </summary>
        [Browsable(true)]
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
        public new ListBox.ObjectCollection Items
        {
            get
            {
                return this._listBox.Items;
            }
        }

        /// <summary>
        /// 选项
        /// </summary>
        [Browsable(true)]
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Content)]
        public C_ListBox ListBox
        {
            get
            {
                return this._listBox;
            }
        }

        public new object SelectedValue
        {
            get
            {
                return this._listBox.SelectedValue;
            }
            set
            {
                this.SetDataSource(null);
                if (value != null)
                {
                    this._listBox.SelectedValue = value;
                }
            }
        }

        public new string Text
        {
            get
            {
                return base.Text;
            }
            set
            {
                base.Text = value;
                //this.SetDataSource(value);
                this.ListBox_SelectedIndexChanged(this, null);
            }
        }
        #endregion

        #region 事件处理

        /// <summary>
        /// 下拉列表打开
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void dropDown_Opening(object sender, CancelEventArgs e)
        {
            //try
            //{
            //    this._listBox.SelectedIndexChanged -= this.ListBox_SelectedIndexChanged;
            //    this._listBox.ClearSelected();
            //    this._listBox.SelectedIndexChanged += this.ListBox_SelectedIndexChanged;
            //}
            //catch (Exception ex)
            //{
            //    throw ex;
            //}
        }

        /// <summary>
        /// 下拉列表关闭
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void dropDown_Closed(object sender, ToolStripDropDownClosedEventArgs e)
        {
        }

        /// <summary>
        /// 文本框值改变
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void DKListBoxComboBox_TextChanged(object sender, EventArgs e)
        {
            try
            {
                this.SetDataSource(base.Text);
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void DKListBoxComboBox_KeyUp(object sender, KeyEventArgs e)
        {
            try
            {
                int boxSelectedIndex = this.ListBox.SelectedIndex;
                int boxItemCount = this.ListBox.Items.Count;
                switch (e.KeyCode)
                {
                    // 通过上下箭头在待选框中移动
                    case Keys.Up:
                        if (boxItemCount > 0)
                        {
                            boxSelectedIndex--;
                            if (boxSelectedIndex < -1)
                            {
                                boxSelectedIndex = boxItemCount - 1;
                            }
                            this._isDropDownClose = false;
                            this._listBox.SelectedIndexChanged -= this.ListBox_SelectedIndexChanged;
                            if (boxSelectedIndex == -1)
                            {
                                this.ListBox.ClearSelected();
                            }
                            else
                            {
                                this.ListBox.SelectedIndex = boxSelectedIndex;
                            }
                            this._listBox.SelectedIndexChanged += this.ListBox_SelectedIndexChanged;
                            this._isDropDownClose = true;
                        }
                        break;
                    case Keys.Down:
                        if (boxItemCount > 0)
                        {
                            boxSelectedIndex++;
                            if (boxSelectedIndex >= boxItemCount)
                            {
                                boxSelectedIndex = -1;
                            }
                            this._isDropDownClose = false;
                            this._listBox.SelectedIndexChanged -= this.ListBox_SelectedIndexChanged;
                            if (boxSelectedIndex == -1)
                            {
                                this._listBox.ClearSelected();
                                this._listBox.SelectedItem = null;
                            }
                            else
                            {
                                this._listBox.SelectedIndex = boxSelectedIndex;
                            }
                            this._listBox.SelectedIndexChanged += this.ListBox_SelectedIndexChanged;
                            this._isDropDownClose = true;
                        }
                        break;
                    case Keys.Escape:
                        // ESC隐藏提示
                        //this.ResetSelectedValue();
                        break;
                    case Keys.Return:
                        // 回车选择 在输入法中按回车也会响应这个事件
                        this.ResetSelectedValue();
                        break;
                    default:
                        break;
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary>
        /// 输入文本框值
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void DKListBoxComboBox_KeyDown(object sender, KeyEventArgs e)
        {
            try
            {
                this.ShowCbDropDown();
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary>
        /// Form大小改变
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void form_SizeChanged(object sender, EventArgs e)
        {
            try
            {
                this.HideCbDropDown();
                Control control = sender as Control;
                if (control != null)
                {
                    control.Refresh();
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary>
        /// Form位置改变
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void form_LocationChanged(object sender, EventArgs e)
        {
            try
            {
                this.HideCbDropDown();
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary>
        /// Form失去焦点时
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void form_Deactivate(object sender, EventArgs e)
        {
            try
            {
                // listbox不能改变大小，不能移动滚动条
                //this.HideCbDropDown();
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary>
        /// Form激活
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        void form_Activated(object sender, EventArgs e)
        {
            try
            {
                this.HideCbDropDown();
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary>
        /// 焦点离开
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void DKListBoxComboBox_Leave(object sender, EventArgs e)
        {
            try
            {
                this.ResetSelectedValue();
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary>
        /// 选项改变
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void ListBox_SelectedIndexChanged(object sender, EventArgs e)
        {
            try
            {
                if (this._listBox.SelectedItem == null)
                {
                    base.Text = string.Empty;
                }
                else
                {
                    this.TextChanged -= this.DKListBoxComboBox_TextChanged;
                    base.Text = this._listBox.GetItemText(this._listBox.SelectedItem);
                    this.TextChanged += this.DKListBoxComboBox_TextChanged;
                }
                this.SelectionStart = base.Text.Length;

                this.HideDropDown();
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary>
        /// 尺寸改变
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void DKListBoxComboBox_SizeChanged(object sender, EventArgs e)
        {
            try
            {
                this.HideCbDropDown();
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary>
        /// 位置改变
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void DKListBoxComboBox_LocationChanged(object sender, EventArgs e)
        {
            try
            {
                this.HideCbDropDown();
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        #endregion

        #region 公有方法/函数

        /// <summary>
        /// 显示下拉列表
        /// </summary>
        public override void ShowDropDown()
        {
            if (this.Enabled && !this.dropDown.Visible)
            {
                if (!_isSetting)
                {
                    _isSetting = true;
                    Control control = this.Parent;
                    while (control != null && !(control is Form))
                    {
                        control = control.Parent;
                    }
                    Form form = control as Form;
                    if (form != null)
                    {
                        form.LocationChanged += form_LocationChanged;
                        form.SizeChanged += form_SizeChanged;
                        form.Deactivate += form_Deactivate;
                        form.Activated += form_Activated;
                    }
                }

                //int itemCount = this.ListBox.Items.Count;
                //this._containerControl.Height = itemCount * 20;
                this._isDropDownShowing = true;
                base.ShowDropDown();
                this._isDropDownShowing = false;
                int selectionStart = this.SelectionStart;
                int selectionLength = this.SelectionLength;
                this.Focus();
                this.SelectionStart = selectionStart;
                this.SelectionLength = selectionLength;
            }
        }

        /// <summary>
        /// 关闭下拉列表
        /// </summary>
        public override void HideDropDown()
        {
            if (this.dropDown.Visible && this._isDropDownClose)
            {
                base.HideDropDown();
                this.dropDown.Close();
                this.dropDown.Visible = false;
            }
        }

        #endregion

        #region 受保护方法/函数

        /// <summary>
        /// 改变大小
        /// </summary>
        /// <param name="e"></param>
        protected override void OnResize(EventArgs e)
        {
            // When the ComboBox is resized, the width of the dropdown 
            // is also resized to match the width of the ComboBox. I think it looks better.
            Size Size = new Size(Width, DropDownControl.Height);
            dropDown.Size = Size;
            base.OnResize(e);
        }

        #endregion

        #region 私有方法/函数

        /// <summary>
        /// 
        /// </summary>
        internal void ResetSelectedValue()
        {
            if (this._isDropDownShowing)
            {
                return;
            }
            this.HideCbDropDown();

            if (this._listBox.SelectedItem != null)
            {
                base.Text = this._listBox.GetItemText(this._listBox.SelectedItem);
                this.SelectionStart = base.Text.Length;
                return;
            }

            if (this._dropDownOnly && !string.IsNullOrEmpty(base.Text))
            {
                bool hasValue = false;
                foreach (object item in this._listBox.Items)
                {
                    string itemText = this._listBox.GetItemText(item);
                    if (itemText.Contains(this.Text))
                    {
                        base.Text = itemText;
                        this._listBox.SelectedItem = item;
                        hasValue = true;
                        break;
                    }
                }

                if (!hasValue)
                {
                    base.Text = string.Empty;
                    this._listBox.ClearSelected();
                }
                this.SelectionStart = base.Text.Length;
            }
        }

        /// <summary>
        /// 模糊过滤数据
        /// </summary>
        /// <param name="text"></param>
        private void SetDataSource(string text)
        {
            DataTable dtDataSource = this._listBox.DataSource as DataTable;
            if (dtDataSource == null)
            {
                return;
            }

            this._listBox.SelectedIndexChanged -= this.ListBox_SelectedIndexChanged;

            if (string.IsNullOrEmpty(text)
                || string.IsNullOrEmpty(this._listBox.DisplayMember)
                || string.IsNullOrEmpty(this._listBox.ValueMember))
            {
                dtDataSource.DefaultView.RowFilter = null;
            }
            else
            {
                dtDataSource.DefaultView.RowFilter = this._listBox.DisplayMember + " LIKE '%" + Utility.SelectFilterLike(text) + "%'";
            }

            if (string.IsNullOrEmpty(text))
            {
                this._listBox.ClearSelected();
                this._listBox.SelectedItem = null;
                this.TextChanged -= this.DKListBoxComboBox_TextChanged;
                base.Text = text;
                this.TextChanged += this.DKListBoxComboBox_TextChanged;
            }

            this._listBox.SelectedIndexChanged += this.ListBox_SelectedIndexChanged;
        }

        #endregion
    }
}