C# 使用ToolStripDropDown實現下拉框,條例式和多選式

偏执的太偏执、 2021-11-10 05:16 466阅读 0赞

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xvc2VkZ3Vlc3Q_size_16_color_FFFFFF_t_70][]

![20190802092509439.png][]

資源地址:[https://download.csdn.net/download/losedguest/11461674][https_download.csdn.net_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

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L2xvc2VkZ3Vlc3Q_size_16_color_FFFFFF_t_70]: /images/20211109/c3a320c60df74688849ed0b8733e4a99.png
[20190802092509439.png]: /images/20211109/63474b6771a948099db4d4121b89ee99.png
[https_download.csdn.net_download_losedguest_11461674]: https://download.csdn.net/download/losedguest/11461674