/*******************************************************************************
 * Copyright(c) 2014 DongkeSoft All rights reserved. / Confidential
 * 类的信息：
 *      1.程序名称：C_CheckedListBox.cs
 *      2.功能描述：扩展的复选框列表控件：便于修改背景颜色及字体、颜色
 * 编辑履历：
 *      作者            日期                版本            修改内容
 *      陈晓野          2014/08/13          1.00            新建
 *******************************************************************************/

using System;
using System.ComponentModel;
using System.Drawing;
using System.Security.Permissions;
using System.Text;
using System.Windows.Forms;

namespace Dongke.IBOSS.PRD.Basics.BaseControls
{
    /// <summary>
    /// 扩展的复选框列表控件
    /// </summary>
    public partial class C_CheckedListBox : CheckedListBox
    {
        #region 成员变量

        private CheckState _selectedItemCheckState = CheckState.Unchecked;
        private Object _selectedItem = null;
        private bool _canMoveItem = false;

        #endregion

        #region 构造函数

        public C_CheckedListBox()
        {
            InitializeComponent();
        }

        #endregion

        #region 属性

        /// <summary>
        /// 获取或者设定列表的项目是否可以移动
        /// </summary>
        [DefaultValue(false)]
        public bool CanMoveItem
        {
            get
            {
                return _canMoveItem;
            }
            set
            {
                _canMoveItem = value;
            }
        }

        /// <summary>
        /// 获取或者设定选中的项目的数组
        /// </summary>
        public Object[] SelectedValues
        {
            get
            {
                System.Collections.Generic.List<Object> list =
                    new System.Collections.Generic.List<Object>();
                foreach (CheckedBoxListItem item in this.CheckedItems)
                {
                    list.Add(item.Value);
                }
                return list.ToArray();
            }
            set
            {
                if (value != null)
                {
                    SetItemCheck(value);
                }
            }
        }

        /// <summary>
        /// 获取或者设定选中的项目的集合例如返回1,2,3
        /// </summary>
        [Description("获取或者设定选中的项目的集合.例如返回\"1,2,3\"")]
        public string SelectedArray
        {
            get
            {
                string array = "";
                foreach (CheckedBoxListItem item in this.CheckedItems)
                {
                    array += "," + item.Value;
                }
                array = array.Substring(1);
                return array;
            }
        }

        #endregion

        #region 公开方法或者函数

        /// <summary>
        /// 往控件的项目中追加项目
        /// </summary>
        /// <param name="item">追加的项目</param>
        public void Add(CheckedBoxListItem item)
        {
            base.Items.Add(item);
            item.ParentControl = this;
        }

        /// <summary>
        /// 清除所有的选中状态
        /// </summary>
        public void ClearItemCheck()
        {
            for (int i = this.Items.Count - 1; 0 <= i; i--)
            {
                this.SetItemCheckState(i, CheckState.Unchecked);
                CheckedBoxListItem item = this.Items[i] as CheckedBoxListItem;
                if (item == null)
                {
                    continue;
                }
                item.Checked = CheckState.Unchecked;
            }
        }

        /// <summary>
        /// 将所有项目设置成选中状态
        /// </summary>
        public void AllItemCheck()
        {
            for (int i = this.Items.Count - 1; 0 <= i; i--)
            {
                this.SetItemCheckState(i, CheckState.Checked);
                CheckedBoxListItem item = this.Items[i] as CheckedBoxListItem;
                if (item == null)
                {
                    continue;
                }
                item.Checked = CheckState.Checked;
            }
        }

        #endregion

        #region 受保护的方法或者函数

        /// <summary>
        /// 将指定的项目设置成选中状态
        /// </summary>
        /// <param name="selectedValues">指定选中的项目</param>
        protected void SetItemCheck(Object[] selectedValues)
        {
            ClearItemCheck();
            for (int k = 0; k < selectedValues.Length; k++)
            {
                for (int i = this.Items.Count - 1; 0 <= i; i--)
                {
                    CheckedBoxListItem item = this.Items[i] as CheckedBoxListItem;
                    if (item == null)
                    {
                        continue;
                    }
                    if (selectedValues[k].ToString().Equals(item.Value.ToString()))
                    {
                        this.SetItemCheckState(i, CheckState.Checked);
                        item.Checked = CheckState.Checked;
                        break;
                    }
                }
            }
        }

        #endregion

        #region 私有方法或者函数

        /// <summary>
        /// 控件的项目选中时的事件
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void CheckedListBox_ItemCheck(Object sender, ItemCheckEventArgs e)
        {
            if (this.Items[e.Index] is CheckedBoxListItem)
            {
                CheckedBoxListItem item = (CheckedBoxListItem)this.Items[e.Index];
                item.Checked = e.NewValue;
            }
        }

        #endregion

        #region 控件的事件

        /// <summary>
        /// 项目值选中状态事件
        /// </summary>
        /// <param name="e"></param>
        protected override void OnItemCheck(ItemCheckEventArgs e)
        {
            if (this.Items[e.Index] is CheckedBoxListItem)
            {
                CheckedBoxListItem item = (CheckedBoxListItem)this.Items[e.Index];
                if (item.Checked == e.NewValue)
                {
                    return;
                }
                base.OnItemCheck(e);
                item.Checked = e.NewValue;
            }
            else
            {
                base.OnItemCheck(e);
            }
        }

        /// <summary>
        /// 鼠标点击事件，做移动处理
        /// </summary>
        /// <param name="e"></param>
        protected override void OnMouseDown(MouseEventArgs e)
        {
            base.OnMouseDown(e);

            if (0 <= this.SelectedIndex && e.Button == MouseButtons.Left)
            {
                _selectedItem = this.SelectedItem;
                _selectedItemCheckState = this.GetItemCheckState(this.SelectedIndex);
                this.ClearSelected();
                this.SelectedItem = _selectedItem;
            }
        }

        /// <summary>
        /// 鼠标移动事件，主要是项目移动
        /// </summary>
        /// <param name="e"></param>
        protected override void OnMouseUp(MouseEventArgs e)
        {
            base.OnMouseUp(e);

            if (_selectedItem != null)
            {
                if (_selectedItem == this.SelectedItem)
                {
                }
                else
                {
                    if (0 <= this.SelectedIndex && this.CanMoveItem)
                    {
                        this.Items.Remove(_selectedItem);
                        this.Items.Insert(this.SelectedIndex, _selectedItem);
                        this.SetItemCheckState(this.SelectedIndex - 1, _selectedItemCheckState);
                    }
                }
            }
        }

        #endregion
    }

    /// <summary>
    /// 控件的项目类
    /// </summary>
    public class CheckedBoxListItem
    {
        #region 成员变量

        // 选中项目的内容
        private string _displayString = string.Empty;
        // 选中项目的状态
        private CheckState _checked = CheckState.Unchecked;
        // 选中项目的值
        private Object _value = null;
        // ParentControl
        private C_CheckedListBox _parentControl = null;
        // 防止死循环
        private bool _canSynchronizeFlag = false;

        #endregion

        #region 构造函数

        /// <summary>
        /// 构造函数
        /// </summary>
        public CheckedBoxListItem()
        {
        }

        /// <summary>
        /// 控件的项目类的构造函数
        /// </summary>
        /// <param name="displayString">选中项目的内容</param>
        /// <param name="itemChecked">选中项目的状态</param>
        /// <param name="value">选中项目的值</param>
        public CheckedBoxListItem(string displayString, CheckState itemChecked, Object value)
        {
            _displayString = displayString;
            _checked = itemChecked;
            _value = value;
        }

        #endregion

        #region 属性

        /// <summary>
        /// 获取或者设定选中项目的内容
        /// </summary>
        public string DisplayString
        {
            get
            {
                return _displayString;
            }
            set
            {
                _displayString = value;
            }
        }

        /// <summary>
        /// 获取或者设定项目的选中状态
        /// </summary>
        public CheckState Checked
        {
            get
            {
                return _checked;
            }
            set
            {
                _checked = value;
                this.SetItemChecked();
            }
        }

        /// <summary>
        /// 获取或者设定项目的值
        /// </summary>
        public Object Value
        {
            get
            {
                return _value;
            }
            set
            {
                _value = value;
            }
        }

        /// <summary>
        /// 获取或者设定ParentControl属性
        /// </summary>
        public C_CheckedListBox ParentControl
        {
            get
            {
                return _parentControl;
            }
            set
            {
                _parentControl = value;
                this.SetItemChecked();
            }
        }

        #endregion

        #region 公开方法或者函数

        /// <summary>
        /// 选中项目的内容
        /// </summary>
        /// <returns>选中项目的内容</returns>
        public override string ToString()
        {
            return _displayString;
        }

        #endregion

        #region 受保护的方法或者函数

        /// <summary>
        /// 设定各项目的选中状态
        /// </summary>
        protected void SetItemChecked()
        {
            if (this.ParentControl == null)
            {
                return;
            }

            int index = this.ParentControl.Items.IndexOf(this);
            if (0 <= index
                && this.ParentControl.GetItemCheckState(index) != this.Checked
                && !_canSynchronizeFlag)
            {
                _canSynchronizeFlag = true;
                this.ParentControl.SetItemCheckState(index, this.Checked);
                _canSynchronizeFlag = false;
            }
        }

        #endregion
    }
}