（二十八）c#Winform自定义控件-文本框（一）
2024-08-31 22:33:21
官网
前提
入行已经7,8年了，一直想做一套漂亮点的自定义控件，于是就有了本系列文章。
GitHub：https://github.com/kwwwvagaa/NetWinformControl
码云：https://gitee.com/kwwwvagaa/net_winform_custom_control.git
如果觉得写的还行，请点个 star 支持一下吧
欢迎前来交流探讨： 企鹅群568015492 idkey=6e08741ef16fe53bf0314c1c9e336c4f626047943a8b76bac062361bab6b4f8d">
目录
https://www.cnblogs.com/bfyx/p/11364884.html
准备工作
终于到文本框了，文本框将包含原文本框扩展，透明文本框，数字输入文本框，带边框文本框
本文将讲解原文本框扩展，主要增加水印和输入控制
开始
添加一个组件，命名TextBoxEx，继承TextBox
属性
private bool blnFocus = false;
private string _promptText = string.Empty;
private Font _promptFont = new Font("微软雅黑", 15f, FontStyle.Regular, GraphicsUnit.Pixel);
private Color _promptColor = Color.Gray;
private Rectangle _myRectangle = Rectangle.FromLTRB(, , , );
private TextInputType _inputType = TextInputType.NotControl;
private string _regexPattern = "";
private string m_strOldValue = string.Empty;
private decimal _maxValue = 1000000m;
private decimal _minValue = -1000000m;
private int _decLength = ;
/// <summary>
/// 水印文字
/// </summary>
[Description("水印文字"), Category("自定义")]
public string PromptText
{
get
{
return this._promptText;
}
set
{
this._promptText = value;
this.OnPaint(null);
}
}
[Description("水印字体"), Category("自定义")]
public Font PromptFont
{
get
{
return this._promptFont;
}
set
{
this._promptFont = value;
}
}
[Description("水印颜色"), Category("自定义")]
public Color PromptColor
{
get
{
return this._promptColor;
}
set
{
this._promptColor = value;
}
}
public Rectangle MyRectangle
{
get;
set;
}
public string OldText
{
get;
set;
}
[Description("获取或设置一个值，该值指示文本框中的文本输入类型。")]
public TextInputType InputType
{
get
{
return this._inputType;
}
set
{
this._inputType = value;
if (value != TextInputType.NotControl)
{
TextChanged -= new EventHandler(this.TextBoxEx_TextChanged);
TextChanged += new EventHandler(this.TextBoxEx_TextChanged);
}
else
{
TextChanged -= new EventHandler(this.TextBoxEx_TextChanged);
}
}
}
/// <summary>
/// 获取或设置一个值，该值指示当输入类型InputType=Regex时，使用的正则表达式。
/// </summary>
[Description("获取或设置一个值，该值指示当输入类型InputType=Regex时，使用的正则表达式。")]
public string RegexPattern
{
get
{
return this._regexPattern;
}
set
{
this._regexPattern = value;
}
}
/// <summary>
/// 当InputType为数字类型时，能输入的最大值
/// </summary>
[Description("当InputType为数字类型时，能输入的最大值。")]
public decimal MaxValue
{
get
{
return this._maxValue;
}
set
{
this._maxValue = value;
}
}
/// <summary>
/// 当InputType为数字类型时，能输入的最小值
/// </summary>
[Description("当InputType为数字类型时，能输入的最小值。")]
public decimal MinValue
{
get
{
return this._minValue;
}
set
{
this._minValue = value;
}
}
/// <summary>
/// 当InputType为数字类型时，能输入的最小值
/// </summary>
[Description("当InputType为数字类型时，小数位数。")]
public int DecLength
{
get
{
return this._decLength;
}
set
{
this._decLength = value;
}
}
一些事件
void TextBoxEx_KeyPress(object sender, KeyPressEventArgs e)
{
//以下代码 取消按下回车或esc的“叮”声
if (e.KeyChar == System.Convert.ToChar() || e.KeyChar == System.Convert.ToChar())
{
e.Handled = true;
}
} private void TextBoxEx_MouseUp(object sender, MouseEventArgs e)
{
if (this.blnFocus)
{
base.SelectAll();
this.blnFocus = false;
}
} private void TextBoxEx_GotFocus(object sender, EventArgs e)
{
this.blnFocus = true;
base.SelectAll();
} private void TextBoxEx_TextChanged(object sender, EventArgs e)
{
if (this.Text == "")
{
this.m_strOldValue = this.Text;
}
else if (this.m_strOldValue != this.Text)
{
if (!ControlHelper.CheckInputType(this.Text, this._inputType, this._maxValue, this._minValue, this._decLength, this._regexPattern))
{
int num = base.SelectionStart;
if (this.m_strOldValue.Length < this.Text.Length)
{
num--;
}
else
{
num++;
}
base.TextChanged -= new EventHandler(this.TextBoxEx_TextChanged);
this.Text = this.m_strOldValue;
base.TextChanged += new EventHandler(this.TextBoxEx_TextChanged);
if (num < )
{
num = ;
}
base.SelectionStart = num;
}
else
{
this.m_strOldValue = this.Text;
}
}
}
重绘
protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
if (string.IsNullOrEmpty(this.Text) && !string.IsNullOrEmpty(this._promptText))
{
if (e == null)
{
using (Graphics graphics = Graphics.FromHwnd(base.Handle))
{
if (this.Text.Length == && !string.IsNullOrEmpty(this.PromptText))
{
TextFormatFlags textFormatFlags = TextFormatFlags.EndEllipsis | TextFormatFlags.VerticalCenter;
if (this.RightToLeft == RightToLeft.Yes)
{
textFormatFlags |= (TextFormatFlags.Right | TextFormatFlags.RightToLeft);
}
TextRenderer.DrawText(graphics, this.PromptText, this._promptFont, base.ClientRectangle, this._promptColor, textFormatFlags);
}
}
}
}
}
下面是完整代码
// 版权所有 黄正辉 交流群：568015492 QQ：623128629
// 文件名称：TextBoxEx.cs
// 创建日期：2019-08-15 16:03:44
// 功能描述：TextBox
// 项目地址：https://gitee.com/kwwwvagaa/net_winform_custom_control
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Diagnostics;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms; namespace HZH_Controls.Controls
{
public partial class TextBoxEx : TextBox
{
private bool blnFocus = false; private string _promptText = string.Empty; private Font _promptFont = new Font("微软雅黑", 15f, FontStyle.Regular, GraphicsUnit.Pixel); private Color _promptColor = Color.Gray; private Rectangle _myRectangle = Rectangle.FromLTRB(, , , ); private TextInputType _inputType = TextInputType.NotControl; private string _regexPattern = ""; private string m_strOldValue = string.Empty; private decimal _maxValue = 1000000m; private decimal _minValue = -1000000m; private int _decLength = ; /// <summary>
/// 水印文字
/// </summary>
[Description("水印文字"), Category("自定义")]
public string PromptText
{
get
{
return this._promptText;
}
set
{
this._promptText = value;
this.OnPaint(null);
}
} [Description("水印字体"), Category("自定义")]
public Font PromptFont
{
get
{
return this._promptFont;
}
set
{
this._promptFont = value;
}
} [Description("水印颜色"), Category("自定义")]
public Color PromptColor
{
get
{
return this._promptColor;
}
set
{
this._promptColor = value;
}
} public Rectangle MyRectangle
{
get;
set;
} public string OldText
{
get;
set;
} [Description("获取或设置一个值，该值指示文本框中的文本输入类型。")]
public TextInputType InputType
{
get
{
return this._inputType;
}
set
{
this._inputType = value;
if (value != TextInputType.NotControl)
{
TextChanged -= new EventHandler(this.TextBoxEx_TextChanged);
TextChanged += new EventHandler(this.TextBoxEx_TextChanged);
}
else
{
TextChanged -= new EventHandler(this.TextBoxEx_TextChanged);
}
}
}
/// <summary>
/// 获取或设置一个值，该值指示当输入类型InputType=Regex时，使用的正则表达式。
/// </summary>
[Description("获取或设置一个值，该值指示当输入类型InputType=Regex时，使用的正则表达式。")]
public string RegexPattern
{
get
{
return this._regexPattern;
}
set
{
this._regexPattern = value;
}
}
/// <summary>
/// 当InputType为数字类型时，能输入的最大值
/// </summary>
[Description("当InputType为数字类型时，能输入的最大值。")]
public decimal MaxValue
{
get
{
return this._maxValue;
}
set
{
this._maxValue = value;
}
}
/// <summary>
/// 当InputType为数字类型时，能输入的最小值
/// </summary>
[Description("当InputType为数字类型时，能输入的最小值。")]
public decimal MinValue
{
get
{
return this._minValue;
}
set
{
this._minValue = value;
}
}
/// <summary>
/// 当InputType为数字类型时，能输入的最小值
/// </summary>
[Description("当InputType为数字类型时，小数位数。")]
public int DecLength
{
get
{
return this._decLength;
}
set
{
this._decLength = value;
}
} public TextBoxEx()
{
this.InitializeComponent();
base.GotFocus += new EventHandler(this.TextBoxEx_GotFocus);
base.MouseUp += new MouseEventHandler(this.TextBoxEx_MouseUp);
base.KeyPress += TextBoxEx_KeyPress;
} void TextBoxEx_KeyPress(object sender, KeyPressEventArgs e)
{
//以下代码 取消按下回车或esc的“叮”声
if (e.KeyChar == System.Convert.ToChar() || e.KeyChar == System.Convert.ToChar())
{
e.Handled = true;
}
} private void TextBoxEx_MouseUp(object sender, MouseEventArgs e)
{
if (this.blnFocus)
{
base.SelectAll();
this.blnFocus = false;
}
} private void TextBoxEx_GotFocus(object sender, EventArgs e)
{
this.blnFocus = true;
base.SelectAll();
} private void TextBoxEx_TextChanged(object sender, EventArgs e)
{
if (this.Text == "")
{
this.m_strOldValue = this.Text;
}
else if (this.m_strOldValue != this.Text)
{
if (!ControlHelper.CheckInputType(this.Text, this._inputType, this._maxValue, this._minValue, this._decLength, this._regexPattern))
{
int num = base.SelectionStart;
if (this.m_strOldValue.Length < this.Text.Length)
{
num--;
}
else
{
num++;
}
base.TextChanged -= new EventHandler(this.TextBoxEx_TextChanged);
this.Text = this.m_strOldValue;
base.TextChanged += new EventHandler(this.TextBoxEx_TextChanged);
if (num < )
{
num = ;
}
base.SelectionStart = num;
}
else
{
this.m_strOldValue = this.Text;
}
}
} protected override void OnPaint(PaintEventArgs e)
{
base.OnPaint(e);
if (string.IsNullOrEmpty(this.Text) && !string.IsNullOrEmpty(this._promptText))
{
if (e == null)
{
using (Graphics graphics = Graphics.FromHwnd(base.Handle))
{
if (this.Text.Length == && !string.IsNullOrEmpty(this.PromptText))
{
TextFormatFlags textFormatFlags = TextFormatFlags.EndEllipsis | TextFormatFlags.VerticalCenter;
if (this.RightToLeft == RightToLeft.Yes)
{
textFormatFlags |= (TextFormatFlags.Right | TextFormatFlags.RightToLeft);
}
TextRenderer.DrawText(graphics, this.PromptText, this._promptFont, base.ClientRectangle, this._promptColor, textFormatFlags);
}
}
}
}
} protected override void WndProc(ref Message m)
{
base.WndProc(ref m);
if (m.Msg == || m.Msg == || m.Msg == )
{
this.OnPaint(null);
}
} protected override void OnTextChanged(EventArgs e)
{
base.OnTextChanged(e);
base.Invalidate();
}
}
}
用处及效果
用处：需要控制输入，需要显示水印
最后的话
如果你喜欢的话，请到 https://gitee.com/kwwwvagaa/net_winform_custom_control 点个星 星吧
最新文章
- MVP 实例
- python核心编程学习记录之模块
- jquery 遍历 数组1
- linux下echo命令详解（转）
- sublime text3输入中文的问题.
- android的padding和margin的区别
- python数据的存储和持久化操作
- [Leetcode] implement strStr() (C++)
- 结构体的sizeof
- 学习笔记 css3--选择器&新增颜色模式&文本相关
- 用HTML5、地理定位API和Web服务来开发移动应用
- 利用margin代替小图标的绝对定位;使代码更简洁
- 在linux上创建nfs遇到的问题。
- c语言对齐问题
- linux 安装wordpress 无故往外发送大量垃圾邮件
- NB-IoT有三种部署方式及特点【转】
- nginx的with-http_sub_module模块使用之替换字符串
- ionic 视图滚动到顶部
- VS code 修改主题设置代码对其齐线
- Python 在序列上跟踪索引和值