最近有学员提出项目中要使用键盘控件，系统自带的osk.exe不好用，于是就有了下面的内容：
首先是进行自定义键盘控件的开发，其实核心大家都知道，就是利用SendKeys.Send发送相应
的字符，但是为了做完整，还是加了一些其他的代码，具体样式如下图所示：
源码如下：
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Drawing;
using System.Data;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows.Forms; namespace xktControl
{
public enum KeyBorderCharType
{
CHAR = ,
NUMBER =
}
public partial class xktKeyBoard : UserControl
{
public xktKeyBoard()
{
InitializeComponent();
this.tableLayoutPanel2.CellBorderStyle = TableLayoutPanelCellBorderStyle.Single;
EventHandle(this);
} private void EventHandle(Control ctl)
{
foreach (Control item in ctl.Controls)
{
if (item is Label lb)
{
lb.MouseDown += KeyDown_MouseDown;
}
else if (item.HasChildren)
{
EventHandle(item);
}
}
} [Browsable(true), Description("按键点击事件"), Category("自定义属性")]
public event EventHandler KeyClick; [Browsable(true), Description("回车点击事件"), Category("自定义属性")]
public event EventHandler EnterClick;
/// <summary>
/// Occurs when [backspace clike].
/// </summary>
[Browsable(true), Description("删除点击事件"), Category("自定义属性")]
public event EventHandler BackspaceClick;
/// <summary>
/// Occurs when [retract clike].
/// </summary>
[Browsable(true), Description("关闭点击事件"), Category("自定义属性")]
public event EventHandler CloseClick; private void KeyDown_MouseDown(object sender, MouseEventArgs e)
{
if (sender is Label lbl)
{
if (string.IsNullOrEmpty(lbl.Text))
{
return;
}
if (lbl.Text == "CAP")
{
ToUpperOrLower(this,true);
lbl.Text = "cap";
}
else if (lbl.Text == "cap")
{
ToUpperOrLower(this,false);
lbl.Text = "CAP";
}
else if (lbl.Text == "?123" || lbl.Text == "abc.")
{
ChangeShow(this);
}
else if (lbl.Text == "空格")
{
SendKeys.Send(" ");
}
else if (lbl.Text.ToLower() == "shift")
{
SendKeys.Send("+");
if (lbl.Text == "shift")
{
lbl.Text = "SHIFT";
lbl.Tag = "SHIFT";
}
else
{
lbl.Text = "shift";
lbl.Tag = "shift";
}
}
else if (lbl.Text == "删除")
{
SendKeys.Send("{BACKSPACE}");
BackspaceClick?.Invoke(sender, e);
}
else if (lbl.Text == "回车")
{
SendKeys.Send("{ENTER}");
EnterClick?.Invoke(sender, e);
}
else if (lbl.Text == "关闭")
{
CloseClick?.Invoke(this, e);
}
else
{
string Str = "{" + lbl.Text + "}";
SendKeys.Send(lbl.Text);
KeyClick?.Invoke(sender, e);
}
} } private KeyBorderCharType charType = KeyBorderCharType.CHAR; [Browsable(true), Description("显示样式"), Category("自定义属性")]
public KeyBorderCharType CharType
{
get { return charType; }
set
{
charType = value;
if (value == KeyBorderCharType.CHAR)
{
if (lbl_NumChar.Text.ToLower() == "abc.")
{
ChangeShow(this);
}
}
else
{
if (lbl_NumChar.Text.ToLower() == "?123")
{
ChangeShow(this);
}
}
}
} private void ToUpperOrLower(Control ctl, bool bln)
{
foreach (Control item in ctl.Controls)
{
if (item is Label lbl)
{
if (lbl.Text == "abc." || lbl.Text.ToLower() == "shift")
return; lbl.Text = bln ? lbl.Text.ToUpper() : lbl.Text.ToLower();
}
else if (item.HasChildren)
{
ToUpperOrLower(item, bln);
}
}
} private void ChangeShow(Control ctl)
{
foreach (Control item in ctl.Controls)
{
if (item is Label lb)
{
string strTag = lb.Text;
lb.Text = lb.Tag.ToString();
lb.Tag = strTag;
}
else if (item.HasChildren)
{
ChangeShow(item);
}
}
} }
}
实际应用效果如下：