using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Drawing.Drawing2D;
using System.Security.Permissions;
using System.Windows.Forms;
using Dongke.WinForm.Utilities;

namespace Dongke.WinForm.Controls
{
    /// <summary>
    /// 标准复选框列表控件
    /// </summary>
    [ToolboxBitmap(typeof(CheckedListBox))]
    [DefaultBindingProperty("SelectedValue"), DefaultProperty("Items"), DefaultEvent("ItemChecked")]
    [LookupBindingProperties("DataSource", "DisplayMember", "ValueMember", "SelectedValue")]
    public class CklCheckedListBox : CheckedListBox, IDKControl, IDataVerifiable, IAsyncControl
    {
        #region 事件声明
        #region ItemChecked
        /// <summary>
        /// 当某项的选中状态更改后发生
        /// </summary>
        private static readonly object EventItemChecked = new object();

        /// <summary>
        /// 当某项的选中状态更改后发生。
        /// </summary>
        [Description("当某项的选中状态更改后发生。"), Category("CustomerEx")]
        public event ItemCheckedEventHandler ItemChecked
        {
            add
            {
                base.Events.AddHandler(EventItemChecked, value);
            }
            remove
            {
                base.Events.RemoveHandler(EventItemChecked, value);
            }
        }        
        #endregion

        #region HasErrorChanged
        /// <summary>
        /// 当 HasError 属性的值更改时发生。
        /// </summary>
        private static readonly object EventHasErrorChanged = new object();

        /// <summary>
        /// 当 HasError 属性的值更改时发生。
        /// </summary>
        [Description("当 HasError 属性的值更改时发生。"), Category("CustomerEx")]
        public event EventHandler HasErrorChanged
        {
            add
            {
                base.Events.AddHandler(EventHasErrorChanged, value);
            }
            remove
            {
                base.Events.RemoveHandler(EventHasErrorChanged, value);
            }
        }
        #endregion
        #endregion

        #region 成员变量
        /// <summary>
        /// 焦点是否进入控件
        /// </summary>
        private bool _entered = false;
        /// <summary>
        /// 鼠标是否进入控件
        /// </summary>
        private bool _mouseOver = false;
        /// <summary>
        /// 边框颜色
        /// </summary>
        private Color? _borderColor = null;
        /// <summary>
        /// 是否单选
        /// </summary>
        private bool _simpleChecked = false;
        /// <summary>
        /// 正在处理必须选中
        /// </summary>
        private bool _isMustChecking = false;
        /// <summary>
        /// 正在处理单项选中
        /// </summary>
        private bool _isSimpleChecking = false;
        /// <summary>
        /// 上次选中项个数
        /// </summary>
        private int _inputCount = -1;
        #endregion

        #region 构造函数
        /// <summary>
        /// 标准复选框列表控件
        /// </summary>
        public CklCheckedListBox()
        {
            base.CheckOnClick = true;
            base.FormattingEnabled = false;
            base.ThreeDCheckBoxes = false;
            CommonSetting.InitControls(this);
        }
        #endregion

        #region 属性
        /// <summary>
        /// 获取选中的文本
        /// </summary>
        [Description("获取选中的文本。"), Category("CustomerEx")]
        [DefaultValue(null)]
        public string[] CheckedTexts
        {
            get
            {
                List<string> checkedTexts = this.GetCheckedItemTexts();
                return checkedTexts.ToArray();
            }
        }

        /// <summary>
        /// 获取选中的值
        /// </summary>
        [Description("获取选中的值。"), Category("CustomerEx")]
        [DefaultValue(null)]
        public object[] CheckedValues
        {
            get
            {
                List<object> checkedValues = this.GetCheckedItemValues();
                return checkedValues.ToArray();
            }
        }

        /// <summary>
        /// 获取选中项的文本表示形式，用【,】隔开。
        /// </summary>
        [Description("获取选中项的文本表示形式，用【,】隔开。"), Category("CustomerEx")]
        [DefaultValue(null)]
        public string CheckedText
        {
            get
            {
                string text =
                    string.Join(Constant.MULTIPLE_TEXT_SEPARATOR,
                                this.GetCheckedItemTexts());
                return text;
            }
        }

        /// <summary>
        /// 获取选中项的值，用【,】隔开
        /// </summary>
        [Description("获取选中项的值，用【,】隔开。"), Category("CustomerEx")]
        [DefaultValue(null)]
        public string CheckedValue
        {
            get
            {
                string value =
                    string.Join(Constant.MULTIPLE_VALUE_SEPARATOR,
                                this.GetCheckedItemValues());
                return value;
            }
        }

        /// <summary>
        /// 获取或设置控件是否单项选中。
        /// </summary>
        [Description("获取或设置控件是否单项选中。"), Category("CustomerEx")]
        [DefaultValue(false)]
        public bool SimpleChecked
        {
            get
            {
                return this._simpleChecked;
            }
            set
            {
                if (this._simpleChecked != value)
                {
                    this._simpleChecked = value;
                    this.ResetMustOrSimpleChecked();
                }
            }
        }

        /// <summary>
        /// 获取一个值，该值指示控件是否有输入焦点。
        /// </summary>
        [DefaultValue(false)]
        [Browsable(false)]
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
        [EditorBrowsable(EditorBrowsableState.Advanced)]
        public virtual bool Entered
        {
            get
            {
                return this._entered;
            }
            protected set
            {
                if (this._entered != value)
                {
                    this._entered = value;
                    this.InvalidateBorder();
                }
            }
        }

        /// <summary>
        /// 获取一个值，该值指示鼠标是否在控件上方。
        /// </summary>
        [DefaultValue(false)]
        [Browsable(false)]
        [DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
        [EditorBrowsable(EditorBrowsableState.Advanced)]
        public virtual bool MouseOver
        {
            get
            {
                return this._mouseOver;
            }
            protected set
            {
                if (this._mouseOver != value)
                {
                    this._mouseOver = value;
                    this.InvalidateBorder();
                }
            }
        }
        #endregion

        #region 重写属性
        /// <summary>
        /// 获取或设置一个值，该值指示当选定项时是否应切换复选框
        /// </summary>
        [DefaultValue(true)]
        //[DesignerSerializationVisibility(DesignerSerializationVisibility.Hidden)]
        //[EditorBrowsable(EditorBrowsableState.Never)]
        public new bool CheckOnClick
        {
            get
            {
                return base.CheckOnClick;
            }
            set
            {
                base.CheckOnClick = value;
            }
        }

        /// <summary>
        /// 获取或设置控件的数据源
        /// </summary>
        [Description("获取或设置控件的数据源。"), Category("CustomerEx")]
        [DefaultValue(null)]
        [Browsable(true)]
        public new object DataSource
        {
            get
            {
                return base.DataSource;
            }
            set
            {
                string displayMember = base.DisplayMember;
                base.DataSource = value;
                base.DisplayMember = displayMember;
                //if (!this._mustInput)
                {
                    this.SelectedIndex = -1;
                }
            }
        }

        /// <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>
        [Description("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。"), Category("CustomerEx")]
        [DefaultValue("")]
        [Browsable(true)]
        public new string DisplayMember
        {
            get
            {
                return base.DisplayMember;
            }
            set
            {
                base.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>
        [Description("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。"), Category("CustomerEx")]
        [DefaultValue("")]
        [Browsable(true)]
        public new string ValueMember
        {
            get
            {
                return base.ValueMember;
            }
            set
            {
                base.ValueMember = value;
            }
        }
        #endregion

        #region 重写事件
        #region 属性改变
        /// <summary>
        /// 引发 DataSourceChanged 事件。
        /// </summary>
        /// <param name="e"></param>
        protected override void OnDataSourceChanged(EventArgs e)
        {
            try
            {
                base.OnDataSourceChanged(e);
            }
            catch
            {
            }
            this.ResetMustOrSimpleChecked();
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="e"></param>
        protected override void OnDisplayMemberChanged(EventArgs e)
        {
            base.OnDisplayMemberChanged(e);
            this.ResetMustOrSimpleChecked();
        }

        /// <summary>
        /// 
        /// </summary>
        /// <param name="e"></param>
        protected override void OnValueMemberChanged(EventArgs e)
        {
            base.OnValueMemberChanged(e);
            this.ResetMustOrSimpleChecked();
        }

        /// <summary>
        /// 引发 HasErrorChanged 事件
        /// </summary>
        /// <param name="e">包含事件数据的 EventArgs</param>
        protected virtual void OnHasErrorChanged(EventArgs e)
        {
            EventHandler eventHandler = (EventHandler)base.Events[EventHasErrorChanged];
            if (eventHandler != null)
            {
                eventHandler(this, e);
            }
        }
        #endregion

        #region 行为事件
        /// <summary>
        /// 引发 ItemCheck 事件
        /// </summary>
        /// <param name="ice"></param>
        protected override void OnItemCheck(ItemCheckEventArgs ice)
        {
            if (this._isMustChecking)
            {
                return;
            }
            if (this._isSimpleChecking)
            {
                base.OnItemCheck(ice);
                if (ice.NewValue == CheckState.Indeterminate)
                {
                    ice.NewValue = CheckState.Checked;
                }
                return;
            }
            int checkedCount = (ice.NewValue == CheckState.Unchecked ? -1 : 1) + this.CheckedIndices.Count;
            if (this._mustInput && checkedCount == 0)
            {
                this._isMustChecking = true;
                //base.SetItemChecked(ice.Index, true);
                ice.NewValue = CheckState.Checked;
                this._isMustChecking = false;
                return;
            }
            if (this._simpleChecked && checkedCount > 1)
            {
                this._isSimpleChecking = true;
                foreach (int index in this.CheckedIndices)
                {
                    if (index != ice.Index)
                    {
                        base.SetItemChecked(index, false);
                        //this.SetItemChecked(index, false);
                    }
                }
                this._isSimpleChecking = false;
            }
            base.OnItemCheck(ice);
            if (ice.NewValue == CheckState.Indeterminate)
            {
                ice.NewValue = CheckState.Checked;
            }
        }

        /// <summary>
        /// 引发 ItemChecked 事件
        /// </summary>
        /// <param name="ice">包含事件数据的 ItemCheckedEventArgs</param>
        protected virtual void OnItemChecked(ItemCheckedEventArgs ice)
        {
            ItemCheckedEventHandler eventHandler = (ItemCheckedEventHandler)base.Events[EventItemChecked];
            if (eventHandler != null)
            {
                eventHandler(this, ice);
            }
        }
        #endregion

        #region 键盘事件
        /// <summary>
        /// 引发 System.Windows.Forms.Control.KeyPress 事件
        /// </summary>
        /// <param name="e">所引发的 System.Windows.Forms.KeyPressEventArgs</param>
        protected override void OnKeyPress(KeyPressEventArgs e)
        {
            if (e.KeyChar == Constant.C_SPACE && this.SelectionMode != SelectionMode.None)
            {
                int selectedIndex = this.SelectedIndex;
                if (selectedIndex < 0 || selectedIndex >= this.Items.Count)
                {
                    base.OnKeyPress(e);
                    return;
                }

                CheckState checkedState = this.GetItemCheckState(selectedIndex);
                base.OnKeyPress(e);
                CheckState newCheckValue = this.GetItemCheckState(selectedIndex);
                if (checkedState != newCheckValue)
                {
                    this.CheckOnItemChecked();
                    ItemCheckedEventArgs itemCheckedEventArgs =
                        new ItemCheckedEventArgs(selectedIndex, newCheckValue, checkedState);
                    this.OnItemChecked(itemCheckedEventArgs);
                }
            }
            else
            {
                base.OnKeyPress(e);
            }
        }

        /// <summary>
        /// 键盘点击
        /// </summary>
        /// <param name="e"></param>
        protected override void OnKeyDown(KeyEventArgs e)
        {
            base.OnKeyDown(e);
            if (this.SelectedIndex < 1 && (e.KeyCode == Keys.Up || e.KeyCode == Keys.Left))
            {
                this.SelectPrevItem();
                e.Handled = true;
                return;
            }
            if (this.SelectedIndex == this.Items.Count - 1 &&
                (e.KeyCode == Keys.Down || e.KeyCode == Keys.Right))
            {
                this.SelectNextItem();
                e.Handled = true;
                return;
            }
        }
        #endregion

        #region 焦点事件
        /// <summary>
        /// 输入焦点进入控件
        /// </summary>
        /// <param name="e"></param>
        protected override void OnEnter(EventArgs e)
        {
            this.Entered = true;
            base.OnEnter(e);
        }

        /// <summary>
        /// 获得焦点
        /// </summary>
        /// <param name="e"></param>
        protected override void OnGotFocus(EventArgs e)
        {
            base.OnGotFocus(e);
        }

        /// <summary>
        /// 失去焦点
        /// </summary>
        /// <param name="e"></param>
        protected override void OnLostFocus(EventArgs e)
        {
            base.OnLostFocus(e);
        }

        /// <summary>
        /// 输入焦点离开控件
        /// </summary>
        /// <param name="e"></param>
        protected override void OnLeave(EventArgs e)
        {
            base.OnLeave(e);
            //this.Entered = false;
        }

        /// <summary>
        /// 控件正在验证
        /// </summary>
        /// <param name="e"></param>
        protected override void OnValidating(CancelEventArgs e)
        {
            base.OnValidating(e);
            if (this.HasError && !this._canLostFocusOnError)
            {
                e.Cancel = true;
            }
        }

        /// <summary>
        /// 控件完成验证
        /// </summary>
        /// <param name="e"></param>
        protected override void OnValidated(EventArgs e)
        {
            this.Entered = false;
            base.OnValidated(e);
        }
        #endregion

        #region 鼠标事件
        /// <summary>
        /// 鼠标进入控件
        /// </summary>
        /// <param name="e"></param>
        protected override void OnMouseEnter(EventArgs e)
        {
            this.MouseOver = true;
            base.OnMouseEnter(e);
        }

        /// <summary>
        /// 鼠标离开控件
        /// </summary>
        /// <param name="e"></param>
        protected override void OnMouseLeave(EventArgs e)
        {
            base.OnMouseLeave(e);
            this.MouseOver = false;
        }

        /// <summary>
        /// 鼠标移动
        /// </summary>
        /// <param name="e"></param>
        protected override void OnMouseMove(MouseEventArgs e)
        {
            base.OnMouseMove(e);
        }

        /// <summary>
        /// 鼠标按下
        /// </summary>
        /// <param name="e"></param>
        protected override void OnMouseDown(MouseEventArgs e)
        {
            base.OnMouseDown(e);
        }

        /// <summary>
        /// 鼠标抬起
        /// </summary>
        /// <param name="e"></param>
        protected override void OnMouseUp(MouseEventArgs e)
        {
            base.OnMouseUp(e);
        }
        #endregion
        #endregion

        #region 重写方法
        /// <summary>
        /// 处理 System.Windows.Forms.CheckedListBox 控件从顶级窗口中接收的命令消息
        /// </summary>
        /// <param name="m">顶级窗口发送到此控件的 System.Windows.Forms.Message</param>
        [SecurityPermission(SecurityAction.LinkDemand, Flags = SecurityPermissionFlag.UnmanagedCode)]
        protected override void WmReflectCommand(ref Message m)
        {
            int n = (int)((long)m.WParam);
            n = n >> 16 & 65535;
            switch (n)
            {
                case 1:
                case 2:
                    int selectedIndex = this.SelectedIndex;
                    if (selectedIndex < 0 || selectedIndex >= this.Items.Count)
                    {
                        base.WmReflectCommand(ref m);
                        return;
                    }

                    CheckState checkedState = this.GetItemCheckState(selectedIndex);
                    base.WmReflectCommand(ref m);
                    CheckState newCheckValue = this.GetItemCheckState(selectedIndex);
                    if (checkedState != newCheckValue)
                    {
                        this.CheckOnItemChecked();
                        ItemCheckedEventArgs itemCheckEventArgs =
                            new ItemCheckedEventArgs(selectedIndex, newCheckValue, checkedState);
                        this.OnItemChecked(itemCheckEventArgs);
                    }
                    return;
                default:
                    base.WmReflectCommand(ref m);
                    return;
            }
        }

        /// <summary>
        /// 处理 Windows 消息
        /// </summary>
        /// <param name="m">要处理的 Windows System.Windows.Forms.Message</param>
        protected override void WndProc(ref Message m)
        {
            base.WndProc(ref m);

            if (m.Msg == (int)WindowsMessage.WM_PAINT ||
                m.Msg == (int)WindowsMessage.WM_NCPAINT ||
                m.Msg == (int)WindowsMessage.WM_CTLCOLOREDIT)
            {
                //this.WmBorderPaint(ref m);
                BorderColorPaint.WmBorderPaint(this._borderColor, this.Width, this.Height, ref m);
            }
        }
        #endregion

        #region 公有方法
        /// <summary>
        /// 获取指定项的成员属性的值
        /// </summary>
        /// <param name="item">项</param>
        /// <returns>值</returns>
        public virtual object GetItemValue(object item)
        {
            if (this.DataManager != null)
            {
                string dataMember = this.ValueMember;
                if (dataMember == null)
                {
                    dataMember = string.Empty;
                }
                int num = dataMember.LastIndexOf(Constant.S_POINT);
                if (num != -1)
                {
                    dataMember = dataMember.Substring(num + 1);
                }
                return this.FilterItemOnProperty(item, dataMember);
            }
            return null;
        }

        /// <summary>
        /// 获取选中项的文本表示形式
        /// </summary>
        /// <returns>选中项的文本</returns>
        public virtual List<string> GetCheckedItemTexts()
        {
            List<string> checkedTexts = new List<string>();
            foreach (object item in this.CheckedItems)
            {
                checkedTexts.Add(this.GetItemText(item));
            }
            return checkedTexts;
        }

        /// <summary>
        /// 获取选中项的成员属性的值
        /// </summary>
        /// <returns>选中项的值</returns>
        public virtual List<object> GetCheckedItemValues()
        {
            return this.GetCheckedItemValues<object>();
        }

        /// <summary>
        /// 获取选中项的成员属性的值
        /// </summary>
        /// <typeparam name="T">属性值的类型</typeparam>
        /// <returns>选中项的值</returns>
        public virtual List<T> GetCheckedItemValues<T>()
        {
            List<T> checkedValues = new List<T>();
            foreach (object item in this.CheckedItems)
            {
                checkedValues.Add((T)this.GetItemValue(item));
            }
            return checkedValues;
        }

        /// <summary>
        /// 设定全部项的复选状态
        /// </summary>
        /// <param name="value">若要将该项设置为选中，则为 true；否则为 false</param>
        public virtual void SetItemsChecked(bool value)
        {
            for (int i = 0; i < this.Items.Count; i++)
            {
                this.SetItemChecked(value, i);
            }
        }

        /// <summary>
        /// 获取全部项的复选状态
        /// </summary>
        /// <returns>选中状态</returns>
        public virtual CheckState GetItemsCheckState()
        {
            int checkedItemsCount = this.CheckedItems.Count;
            if (checkedItemsCount == 0)
            {
                return CheckState.Unchecked;
            }
            int itemsCount = this.Items.Count;
            if (checkedItemsCount != itemsCount)
            {
                return CheckState.Indeterminate;
            }
            if (!this.ThreeDCheckBoxes)
            {
                return CheckState.Checked;
            }

            for (int i = 0; i < this.CheckedItems.Count; i++)
            {
                CheckState cs = this.GetItemCheckState(i);
                if (cs == CheckState.Indeterminate)
                {
                    return CheckState.Indeterminate;
                }
            }
            return CheckState.Checked;
        }

        /// <summary>
        /// 设定指定项的复选状态
        /// </summary>
        /// <param name="value">若要将该项设置为选中，则为 true；否则为 false</param>
        /// <param name="items">要为其设置复选状态的项</param>
        public virtual void SetItemCheckedByItem(bool value, params object[] items)
        {
            foreach (object item in items)
            {
                for (int i = 0; i < this.Items.Count; i++)
                {
                    object itemInner = this.Items[i];
                    if (itemInner == item)
                    {
                        this.SetItemChecked(value, i);
                        return;
                    }
                }
            }
        }

        /// <summary>
        /// 设定指定值的项的复选状态
        /// </summary>
        /// <param name="value">若要将该项设置为选中，则为 true；否则为 false</param>
        /// <param name="itemValues">要为其设置复选状态的项的值</param>
        public virtual void SetItemCheckedByValue(bool value, params object[] itemValues)
        {
            foreach (object itemValue in itemValues)
            {
                for (int i = 0; i < this.Items.Count; i++)
                {
                    object itemValueInner = this.GetItemValue(this.Items[i]);
                    if ((itemValueInner == null && itemValue == null) ||
                        (itemValueInner != null && itemValueInner.Equals(itemValue)))
                    {
                        this.SetItemChecked(value, i);
                        break;
                    }
                }
            }
        }


        /// <summary>
        /// 设定指定值的项的复选状态
        /// </summary>
        /// <param name="value">若要将该项设置为选中，则为 true；否则为 false</param>
        /// <param name="itemValues">要为其设置复选状态的项的值</param>
        public virtual void SetItemCheckedByValueID(bool value, params string[] itemValues)
        {
            foreach (string itemValue in itemValues)
            {
                for (int i = 0; i < this.Items.Count; i++)
                {
                    object itemValueInner = this.GetItemValue(this.Items[i]);
                    if ((itemValueInner == null && itemValue == null) ||
                        (itemValue != null && itemValue == itemValueInner + ""))
                    {
                        this.SetItemChecked(value, i);
                        break;
                    }
                }
            }
        }

        /// <summary>
        /// 设定指定索引处的项目选中或取消
        /// </summary>
        /// <param name="value">若要将该项设置为选中，则为 true；否则为 false</param>
        /// <param name="indexs">要为其设置复选状态的项的索引</param>
        public void SetItemChecked(bool value, params int[] indexs)
        {
            foreach (int index in indexs)
            {
                //this.SetItemCheckState(index, value ? CheckState.Checked : CheckState.Unchecked);
                // 响应OnItemChecked事件
                this.SetItemChecked(index, value);
            }
        }

        /// <summary>
        /// 设置指定索引处项的复选状态
        /// </summary>
        /// <param name="index">要为其设置状态的项的索引</param>
        /// <param name="value">若要将该项设置为选中，则为 true；否则为 false</param>
        public new void SetItemChecked(int index, bool value)
        {
            bool checkedValue = this.GetItemChecked(index);
            base.SetItemChecked(index, value);
            if (value != checkedValue)
            {
                this.CheckOnItemChecked();
                ItemCheckedEventArgs itemCheckEventArgs =
                    new ItemCheckedEventArgs(index,
                        value ? CheckState.Checked : CheckState.Unchecked,
                        checkedValue ? CheckState.Checked : CheckState.Unchecked);
                this.OnItemChecked(itemCheckEventArgs);
            }
        }

        /// <summary>
        /// 设置指定索引处项的复选状态
        /// </summary>
        /// <param name="index">要为其设置状态的项的索引</param>
        /// <param name="value">System.Windows.Forms.CheckState 值之一</param>
        public new void SetItemCheckState(int index, CheckState value)
        {
            CheckState checkedState = this.GetItemCheckState(index);
            base.SetItemCheckState(index, value);
            if (value != checkedState)
            {
                this.CheckOnItemChecked();
                ItemCheckedEventArgs itemCheckEventArgs =
                    new ItemCheckedEventArgs(index, value, checkedState);
                this.OnItemChecked(itemCheckEventArgs);
            }
        }

        /// <summary>
        /// 选择下一个Item
        /// </summary>
        /// <param name="clearSelect">是否能选择空</param>
        public void SelectNextItem(bool clearSelect = true)
        {
            int boxItemCount = this.Items.Count;
            if (boxItemCount < 1)
            {
                return;
            }
            int boxSelectedIndex = this.SelectedIndex;
            boxSelectedIndex++;
            if (boxSelectedIndex >= boxItemCount)
            {
                if (this._mustInput || !clearSelect)
                {
                    boxSelectedIndex = 0;
                }
                else
                {
                    boxSelectedIndex = -1;
                }
            }
            if (boxSelectedIndex < 0)
            {
                this.SelectedIndex = 0;
                this.ClearSelected();
            }
            else
            {
                this.SelectedIndex = boxSelectedIndex;
            }
        }

        /// <summary>
        /// 选择上一个Item
        /// </summary>
        /// <param name="clearSelect">是否能选择空</param>
        public void SelectPrevItem(bool clearSelect = true)
        {
            int boxItemCount = this.Items.Count;
            if (boxItemCount < 1)
            {
                return;
            }
            int boxSelectedIndex = this.SelectedIndex;
            boxSelectedIndex--;
            if (boxSelectedIndex < -1 ||
                ((this._mustInput || !clearSelect) && boxSelectedIndex < 0))
            {
                boxSelectedIndex = boxItemCount - 1;
            }
            if (boxSelectedIndex < 0)
            {
                this.ClearSelected();
            }
            else
            {
                this.SelectedIndex = boxSelectedIndex;
            }
        }
        #endregion

        #region 保护方法
        /// <summary>
        /// 重置全部项的复选状态（必选或单选）
        /// </summary>
        internal protected virtual void ResetMustOrSimpleChecked()
        {
            if (this._mustInput && this.CheckedIndices.Count == 0 && this.Items.Count > 0)
            {
                int index = this.SelectedIndex < 0 ? 0 : this.SelectedIndex;
                this.SetItemChecked(index, true);
                return;
            }
            if (this._simpleChecked && this.CheckedIndices.Count > 1)
            {
                this._isSimpleChecking = true;
                try
                {
                    int index = this.CheckedIndices.Contains(this.SelectedIndex) ?
                        this.SelectedIndex : this.CheckedIndices[0];
                    foreach (int checkedIndex in this.CheckedIndices)
                    {
                        if (checkedIndex != index)
                        {
                            this.SetItemChecked(checkedIndex, false);
                        }
                    }
                }
                finally
                {
                    this._isSimpleChecking = false;
                }
                return;
            }
        }
        #endregion

        #region 私有方法
        /// <summary>
        /// 当ItemChecked事件发生时，验证Error。
        /// </summary>
        private void CheckOnItemChecked()
        {
            if (this._mustInput)
            {
                if (this._inputCount != this.CheckedItems.Count)
                {
                    this._inputCount = this.CheckedItems.Count;
                    if (this._inputCount > 0)
                    {
                        this.ClearError();
                    }
                    else
                    {
                        if (this.SelectedIndex > 0)
                        {
                            this.SetItemChecked(this.SelectedIndex, true);
                            return;
                        }
                        if (this.Items.Count > 0)
                        {
                            this.SetItemChecked(0, true);
                            return;
                        }
                        this.SetError(true, ControlErrorCode.DKC_0001, this._itemName);
                    }
                }
            }
        }

        /// <summary>
        /// 使父控件的指定区域无效（将其添加到控件的更新区域，下次绘制操作时将重新绘制更新区域），并向父控件发送绘制消息。
        /// </summary>
        private void InvalidateBorder()
        {
            Color? borderColor = BorderColorPaint.GetBorderColor(this as IDataVerifiable, this._entered, this._mouseOver);

            if (borderColor != this._borderColor)
            {
                this._borderColor = borderColor;
                if (this.Parent == null)
                {
                    this.Invalidate();
                }
                else
                {
                    this.Parent.Invalidate(this.Bounds, true);
                }
            }
        }
        #endregion

        #region IDataVerifiable 成员
        #region 成员变量
        /// <summary>
        /// 显示边框颜色
        /// </summary>
        private bool _showBorderColor = true;
        /// <summary>
        /// 控件的项目名
        /// </summary>
        private string _itemName = null;
        /// <summary>
        /// 控件是否是必须输入项目
        /// </summary>
        private bool _mustInput = false;
        /// <summary>
        /// 控件在验证输入错误时，如何提示
        /// </summary>
        private InputErrorAlert _errorAlert = InputErrorAlert.Validated;
        /// <summary>
        /// 是否显示必须输入项目的提示
        /// </summary>
        private bool _showMustInputAlert = true;
        /// <summary>
        /// 验证不通过时，焦点能否离开
        /// </summary>
        private bool _canLostFocusOnError = true;
        /// <summary>
        /// 验证是否有错误
        /// </summary>
        private bool _hasError = false;
        /// <summary>
        /// 是否自定义错误
        /// </summary>
        private bool _hasCustomerError = false;
        /// <summary>
        /// 错误编码
        /// </summary>
        private ControlErrorCode _errorCode = ControlErrorCode.DKC_0000;
        /// <summary>
        /// 错误消息
        /// </summary>
        private string _errorMessage = null;
        /// <summary>
        /// 自定义错误消息
        /// </summary>
        private string _customerErrorMessage = null;
        #endregion

        #region 属性
        /// <summary>
        /// 获取或设置控件是否显示边框颜色。
        /// </summary>
        [Description("获取或设置控件是否显示边框颜色。"), Category("IDataVerifiable")]
        [DefaultValue(true)]
        public bool ShowBorderColor
        {
            get
            {
                return this._showBorderColor;
            }
            set
            {
                if (this._showBorderColor != value)
                {
                    this._showBorderColor = value;
                    this.InvalidateBorder();
                }
            }
        }

        /// <summary>
        /// 获取或设置控件的项目名
        /// </summary>
        [Description("获取或设置控件的项目名。"), Category("IDataVerifiable")]
        [DefaultValue(null)]
        public string CDItemName
        {
            get
            {
                return this._itemName;
            }
            set
            {
                this._itemName = value;
            }
        }

        /// <summary>
        /// 获取或设置控件是否必须选中项目。
        /// </summary>
        [Description("获取或设置控件是否必须选中项目。"), Category("IDataVerifiable")]
        [DefaultValue(false)]
        public bool MustInput
        {
            get
            {
                return this._mustInput;
            }
            set
            {
                if (this._mustInput != value)
                {
                    this._mustInput = value;
                    this.ResetMustOrSimpleChecked();
                    this.ValidateData();
                    if (this._mustInput && this._showMustInputAlert)
                    {
                        this.InvalidateBorder();
                    }
                }
            }
        }

        /// <summary>
        /// 获取或设置控件是否必须选中项目。
        /// </summary>
        [Description("获取或设置控件在验证输入错误时，如何提示。"), Category("IDataVerifiable")]
        [DefaultValue(typeof(InputErrorAlert), "Validated")]
        public InputErrorAlert InputErrorAlert
        {
            get
            {
                return this._errorAlert;
            }
            set
            {
                if (this._errorAlert != value)
                {
                    this._errorAlert = value;
                    this.InvalidateBorder();
                }
            }
        }

        /// <summary>
        /// 获取或设置控件是否显示必须输入项目提示
        /// </summary>
        [Description("获取或设置控件是否显示必须输入项目提示。"), Category("IDataVerifiable")]
        [DefaultValue(true)]
        public bool ShowMustInputAlert
        {
            get
            {
                return this._showMustInputAlert;
            }
            set
            {
                if (this._showMustInputAlert != value)
                {
                    this._showMustInputAlert = value;
                    this.InvalidateBorder();
                }
            }
        }

        /// <summary>
        /// 获取或设置当验证不通过时，控件是否可以失去焦点
        /// </summary>
        [Description("获取或设置当验证不通过时，控件是否可以失去焦点。"), Category("IDataVerifiable")]
        [DefaultValue(true)]
        public bool CanLostFocusOnError
        {
            get
            {
                return this._canLostFocusOnError;
            }
            set
            {
                this._canLostFocusOnError = value;
            }
        }

        /// <summary>
        /// 获取控件校验时是否有错误
        /// </summary>
        [Description("获取控件校验时是否有错误。"), Category("IDataVerifiable")]
        [DefaultValue(false)]
        public bool HasError
        {
            get
            {
                return this._hasCustomerError || this._hasError;
            }
        }

        /// <summary>
        /// 获取控件校验时的错误编码
        /// </summary>
        [Description("获取控件校验时的错误编码。"), Category("IDataVerifiable")]
        [DefaultValue(typeof(ControlErrorCode), "DKC_0000")]
        public ControlErrorCode ErrorCode
        {
            get
            {
                return this._hasCustomerError ? ControlErrorCode.DKC_C001 : this._errorCode;
            }
        }

        /// <summary>
        /// 获取控件校验时的错误消息
        /// </summary>
        [Description("获取控件校验时的错误编码。"), Category("IDataVerifiable")]
        [DefaultValue(null)]
        public string ErrorMessage
        {
            get
            {
                return this._hasCustomerError ? this._customerErrorMessage : this._errorMessage;
            }
        }
        #endregion

        #region 公有方法
        /// <summary>
        /// 设置自定义错误
        /// </summary>
        /// <param name="hasError">输入是否有错误</param>
        /// <param name="errorMessage">错误消息</param>
        public virtual void SetCustomerError(bool hasError, string errorMessage)
        {
            if (this._hasCustomerError != hasError ||
                this._customerErrorMessage != errorMessage)
            {
                this._hasCustomerError = hasError;
                this._customerErrorMessage = errorMessage;
                this.OnHasErrorChanged(EventArgs.Empty);
                this.InvalidateBorder();
            }
        }

        /// <summary>
        /// 清除自定义错误
        /// </summary>
        public virtual void ClearCustomerError()
        {
            this.SetCustomerError(false, null);
        }

        /// <summary>
        /// 验证输入内容
        /// </summary>
        /// <returns>验证结果</returns>
        public virtual bool ValidateData()
        {
            if (this._mustInput && this.CheckedItems.Count == 0)
            {
                this.SetError(true, ControlErrorCode.DKC_0001, this._itemName);
                return false;
            }

            this.ClearError();
            return true;
        }

        /// <summary>
        /// 清除输入项
        /// </summary>
        public virtual void ClearValue()
        {
            this.SetItemsChecked(false);
        }
        #endregion

        #region 保护方法
        /// <summary>
        /// 设置验证不通过错误
        /// </summary>
        /// <param name="hasError">是否有错误</param>
        /// <param name="code">错误编码</param>
        /// <param name="args">设置格式的对象</param>
        protected void SetError(bool hasError, ControlErrorCode code, params object[] args)
        {
            if (this._hasError != hasError ||
                this._errorCode != code)
            {
                this._hasError = hasError;
                this._errorCode = code;
                if (args != null && args.Length > 0)
                {
                    this._errorMessage = string.Format(code.GetDescription(), args);
                }
                else
                {
                    this._errorMessage = code.GetDescription();
                }
                this.OnHasErrorChanged(EventArgs.Empty);
                this.InvalidateBorder();
            }
        }

        /// <summary>
        /// 清除验证不通过错误
        /// </summary>
        protected void ClearError()
        {
            this.SetError(false, ControlErrorCode.DKC_0000);
        }
        #endregion
        #endregion

        #region IAsyncControl 成员
        #region 成员变量
        /// <summary>
        /// 异步处理开始时，控件状态
        /// </summary>
        private bool _asyncBeginStatus = false;
        private bool _asyncBeginFocused = false;
        #endregion

        #region 公有方法
        /// <summary>
        /// 开始异步处理
        /// </summary>
        /// <param name="doFocus">是否处理焦点</param>
        public virtual void BeginAsync(ref bool doFocus)
        {
            this._asyncBeginFocused = false;
            if (doFocus && this.Focused)
            {
                this._asyncBeginFocused = true;
                doFocus = false;
            }
            this._asyncBeginStatus = this.Enabled;
            this.Enabled = false;
        }

        /// <summary>
        /// 结束异步处理
        /// </summary>
        public virtual void EndAsync()
        {
            this.Enabled = this._asyncBeginStatus;
            if (this._asyncBeginFocused)
            {
                this.Focus();
            }
        }
        #endregion
        #endregion
    }
}