C# 使用ToolStripDropDown實現下拉框,條例式和多選式

最新推荐文章于 2025-05-16 14:06:03 发布

losedguest

最新推荐文章于 2025-05-16 14:06:03 发布

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分类专栏： c# 下拉文章标签：下拉

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本文介绍了一种自定义的SimpelCombox组合框控件和CheckComBox复选框控件的实现方法。SimpelCombox结合了下拉列表和文本框的功能，CheckComBox则提供了多选功能。代码详细展示了如何处理事件，如文本改变、项选中状态变化等。

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資源地址:https://download.youkuaiyun.com/download/losedguest/11461674

功能代碼1:

using System;
using System.ComponentModel;
using System.Drawing;
using System.Windows.Forms;
using WebPublicControls.Properties;

namespace WebPublicControls
{
    public partial class SimpelCombox : UserControl
    {
        private ToolStripControlHost SimpleBoxHost;

        private ToolStripControlHost ListBoxHost;

        private ListBox List = new ListBox();

        private System.Windows.Forms.TextBox HideBox = new System.Windows.Forms.TextBox();

        private ToolStripDropDown dropDown;

        private string _textKey = ""; 

        public event EventHandler TextValueChanged;

        public string TextValue
        {
            get
            {
                return this.SimpleText.Text;
            }
            set
            {
                bool flag = false;
                if (this.SimpleText.Text != value)
                {
                    flag = true;
                }
                this.SimpleText.Text = value;
                this._textKey = "";
                for (int i = 0; i < this.items.Count; i++)
                {
                    if (!(this.items[i] is ListBoxItems))
                    {
                        this._textKey = value;
                        break;
                    }
                    ListBoxItems listBoxItems = (ListBoxItems)this.items[i];
                    if (listBoxItems.Name == value)
                    {
                        this._textKey = listBoxItems.ID;
                        break;
                    }
                }
                if (flag)
                {
                    this.OnTextChanged();
                }
            }
        }

        public string TextKey
        {
            get
            {
                if (this.List.SelectedItem != null)
                {
                    ListBoxItems listBoxItems = (ListBoxItems)this.List.SelectedItem;
                    return listBoxItems.ID;
                }
                return this._textKey;
            }
            set
            {
                bool flag = false;
                if (this._textKey != value)
                {
                    flag = true;
                }
                this.SimpleText.Text = "";
                for (int i = 0; i < this.items.Count; i++)
                {
                    ListBoxItems listBoxItems = (ListBoxItems)this.items[i];
                    if (listBoxItems.ID == value)
                    {
                        this.SimpleText.Text = listBoxItems.Name;
                    }
                }
                this._textKey = value;
                if (flag)
                {
                    this.OnTextChanged();
                }
            }
        }

        public ListBox.ObjectCollection items
        {
            get
            {
                return this.List.Items;
            }
        }

        protected virtual void OnTextChanged()
        {
            if (this.TextValueChanged != null)
            {
                this.TextValueChanged(this, EventArgs.Empty);
            }
        }

        public SimpelCombox()
        {
            this.List.Click += new EventHandler(this.List_Click);
            this.List.BorderStyle = BorderStyle.None;
            this.List.DisplayMember = "Name";
            this.List.ValueMember = "ID";
            this.List.MouseMove -= new MouseEventHandler(this.List_MouseMove);
            this.List.MouseMove += new MouseEventHandler(this.List_MouseMove);
            this.ListBoxHost = new ToolStripControlHost(this.List);
            this.ListBoxHost.AutoSize = false;
            this.HideBox.BorderStyle = BorderStyle.None;
            this.HideBox.Enabled = false;
            this.HideBox.Font = new Font("細明體", 1f);
            this.SimpleBoxHost = new ToolStripControlHost(this.HideBox);
            this.SimpleBoxHost.AutoSize = false;
            this.dropDown = new ToolStripDropDown();
            this.dropDown.AutoSize = false;
            this.dropDown.Items.Add(this.ListBoxHost);
            this.dropDown.Items.Add(this.SimpleBoxHost);
            this.InitializeComponent();
            this.AutoSize = false;
            this.DropDownButton.Click += new EventHandler(this.DropDownButton_Click);
        }

        public void ShowDropDown()
        {
            if (this.dropDown != null)
            {
                this.dropDown.Width = base.Width;
                this.dropDown.AutoSize = true;
                this.dropDown.Show(this, 0, base.Height);
                this.List_AutoSColl();
            }
        }

        /// <summary>
        /// 點擊選中后,自動關閉
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void List_Click(object sender, EventArgs e)
        {
            try
            {
                if (this.List.SelectedIndex > -1)
                {
                    this.dropDown.AutoSize = false;
                    this.TextValue = this.List.SelectedItem.ToString();
                    this.List.Width = 10;
                    this.HideBox.Width = 10;
                    this.dropDown.Width = 10;
                    this.dropDown.Hide();
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        private void DropDownButton_Click(object sender, EventArgs e)
        {
            this.dropDown.AutoSize = true;
            this.List.Width = base.Width;
            this.HideBox.Width = base.Width;
            this.dropDown.Width = base.Width;
            this.dropDown.Show(this, 0, base.Height);
            this.List_AutoSColl();
        }

        private void List_MouseMove(object sender, MouseEventArgs e)
        {
            if (this.items.Count > 0)
            {
                this.List.Focus();
                this.List.SelectedIndex = this.List.IndexFromPoint(e.Location);
            }
        }

        /// <summary>
        /// 滾動條,自動滾動到this.TextValue值的位置且將當前項選中
        /// </summary>
        private void List_AutoSColl()
        {
            try
            {
                if (this.List.SelectedItem != null)
                {
                    this.List.TopIndex = this.List.SelectedIndex;
                    if (this.List.SelectedItem.ToString() == this.TextValue)
                    {
                        return;
                    }
                }
                if (this.List.Items.Count > 0)
                {
                    for (int i = 0; i < this.items.Count; i++)
                    {
                        if (this.items[i] is ListBoxItems)
                        {
                            ListBoxItems listBoxItems = (ListBoxItems)this.items[i];
                            if (listBoxItems.Name == this.TextValue)
                            {
                                this.List.SelectedIndex = i;
                                this.List.TopIndex = i;
                                break;
                            }
                        }
                        else if (this.items[i].ToString() == this.TextValue)
                        {
                            this.List.SelectedIndex = i;
                            this.List.TopIndex = i;
                            break;
                        }
                    }
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }     
    }
}

功能代碼:2

using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Threading;

namespace WebPublicControls
{   
    public partial class CheckComBox : UserControl
    {
        /// <summary>
        /// 下拉控件 空白填充
        /// </summary>
        private ToolStripControlHost SimpleBoxHost;
        /// <summary>
        /// 下拉控件 多選項容器
        /// </summary>
        private ToolStripControlHost ListBoxHost;
        /// <summary>
        /// 多選項
        /// </summary>
        private CheckedListBox List = new CheckedListBox();

        private System.Windows.Forms.TextBox HideBox = new System.Windows.Forms.TextBox();

        //下拉控件
        private ToolStripDropDown dropDown;
        
        /// <summary>
        /// 選中項發生變化后發生
        /// </summary>
        [Category("Property Changed"), Description("選中項發生變化后發生"), DisplayName("ItemCheckedChanged")]
        public event EventHandler ItemCheckedChanged;
        /// <summary>
        /// 當前控件值
        /// </summary>
        [Category("Appearance"), Description("多個值,逗號隔開"), DisplayName("TextValue")]
        public string TextValue
        {
            get { 
                return this.SimpleText.Text;
            }          
        }

        /// <summary>
        /// 設置指定索引項的選中狀態
        /// </summary>
        /// <param name="inds">索引數組</param>
        /// <param name="stat">選中狀態</param>       
        public void SetCheckedIndexState(int [] inds,bool stat)
        {
            if (inds.Length > 0)
            {
                foreach (int val in inds)
                {
                    if (this.items.Count > val)
                    {
                        this.List.SetItemChecked(val, stat);
                    }
                }
            }               
        }       

        public CheckComBox()
        {           
            this.List.BorderStyle = BorderStyle.None;
            this.List.DisplayMember = "Name";
            this.List.ValueMember = "ID";
            this.List.MouseMove -= new MouseEventHandler(this.List_MouseMove);
            this.List.MouseMove += new MouseEventHandler(this.List_MouseMove);
            this.List.MouseLeave -= new EventHandler(this.List_MouseLeave);
            this.List.MouseLeave += new EventHandler(this.List_MouseLeave);
            //ItemCheck,發生在選中前
            this.List.ItemCheck -= new ItemCheckEventHandler(this.List_ItemCheck);
            this.List.ItemCheck += new ItemCheckEventHandler(this.List_ItemCheck);          
            this.ListBoxHost = new ToolStripControlHost(this.List);
            this.ListBoxHost.AutoSize = false;
            this.HideBox.BorderStyle = BorderStyle.None;
            this.HideBox.Enabled = false;
            this.HideBox.Font = new Font("細明體", 1f);
            this.SimpleBoxHost = new ToolStripControlHost(this.HideBox);
            this.SimpleBoxHost.AutoSize = false;
            this.dropDown = new ToolStripDropDown();
            this.dropDown.AutoSize = false;
            this.dropDown.Items.Add(this.ListBoxHost);
            this.dropDown.Items.Add(this.SimpleBoxHost);
            this.InitializeComponent();
            this.AutoSize = false;
            this.DropDownButton.Click += new EventHandler(this.DropDownButton_Click);
        }

        //下拉選項
        public CheckedListBox.ObjectCollection items
        {
            get
            {
                return this.List.Items;
            }
        }
        /// <summary>
        /// 顯示下拉窗
        /// </summary>
        public void ShowDropDown()
        {
            if (this.dropDown != null)
            {
                //下拉窗寬度為開窗控件的寬度,
                this.dropDown.Width = base.Width;
                this.dropDown.AutoSize = true;
                this.dropDown.Show(this, 0, base.Height);               
            }
        }     

        private void DropDownButton_Click(object sender, EventArgs e)
        {
            this.dropDown.AutoSize = true;
            this.List.Width = base.Width;
            this.HideBox.Width = base.Width;
            this.dropDown.Width = base.Width;
            this.dropDown.Show(this, 0, base.Height);          
        }
        /// <summary>
        /// 鼠標移動下拉窗時,自動獲取焦點,防止點兩次才能選中
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void List_MouseMove(object sender, MouseEventArgs e)
        {
            if (this.items.Count > 0)
            {
                this.List.Focus();
                this.List.SelectedIndex = this.List.IndexFromPoint(e.Location);
            }
        }
        /// <summary>
        /// 鼠標離開下拉窗自動關閉
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void List_MouseLeave(object sender, EventArgs e)
        {
            if (this.dropDown != null)
            {
                this.dropDown.AutoSize = false;             
                this.List.Width = 10;
                this.HideBox.Width = 10;
                this.dropDown.Width = 10;
                this.dropDown.Hide();
            }
        }
        /// <summary>
        /// 下拉選項發生變化時
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        private void List_ItemCheck(object sender, ItemCheckEventArgs e)
        {
             //當前CheckedItems的還未發生變化
            //在此需要延時觸發itemCheckChange()
            this.BeginInvoke(new EventHandler(delegate{itemCheckChange(); }));
        }

        private void itemCheckChange()
        {
            try
            {
                Thread.Sleep(1);
                this.SimpleText.Text = "";
               
                if (this.List.CheckedItems != null)
                {
                    for (int i = 0; i < this.List.CheckedItems.Count; i++)
                    {
                        if (this.List.CheckedItems[i] is ListBoxItems)
                        {
                            ListBoxItems listBoxItems = (ListBoxItems)this.List.CheckedItems[i];
                            if (this.SimpleText.Text == "")
                            {
                                this.SimpleText.Text = listBoxItems.ID;
                            }
                            else
                            {
                                this.SimpleText.Text += "," + listBoxItems.ID;
                            }
                        }
                    }
                }
                if (ItemCheckedChanged != null)
                {
                    ItemCheckedChanged(this, EventArgs.Empty);
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }
       
    }
}

功能代碼2