using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Linq;
using System.Text;
using System.Windows.Forms;
using System.Runtime.InteropServices;
namespace TextDemo
{
public partial class Form3 : Form
{
public Form3()
{
InitializeComponent();
}
/// <summary>
/// 添加一个继承自textbox的新类，重写WndProc方法，在重写的方法里重绘边框就可以了
/// </summary>
/// <param name="m"></param>
protected override void WndProc(ref Message m)
{
base.WndProc(ref m);
borderDrawer borderDrawer1 = new borderDrawer();
borderDrawer1.DrawBorder(ref m, this.Width, this.Height);
}
}
#region 第一种方法，使用时必须把文本框的BorderStyle为FixedSingle才能使用
[ToolboxItem(true)]
public class TextBoxXP : System.Windows.Forms.TextBox
{
/// <summary>
/// 获得当前进程，以便重绘控件
/// </summary>
/// <param name="hWnd"></param>
/// <returns></returns>
[System.Runtime.InteropServices.DllImport("user32.dll")]
static extern IntPtr GetWindowDC(IntPtr hWnd);
[System.Runtime.InteropServices.DllImport("user32.dll")]
static extern int ReleaseDC(IntPtr hWnd, IntPtr hDC);
/// <summary>
/// 是否启用热点效果
/// </summary>
private bool _HotTrack = true;
/// <summary>
/// 边框颜色
/// </summary>
private Color _BorderColor = Color.Black;
/// <summary>
/// 热点边框颜色
/// </summary>
private Color _HotColor = Color.FromArgb(0x33, 0x5E, 0xA8);
/// <summary>
/// 是否鼠标MouseOver状态
/// </summary>
private bool _IsMouseOver = false;
#region 属性
/// <summary>
/// 是否启用热点效果
/// </summary>
[Category("行为"),
Description("获得或设置一个值，指示当鼠标经过控件时控件边框是否发生变化。只在控件的BorderStyle为FixedSingle时有效"),
DefaultValue(true)]
public bool HotTrack
{
get
{
return this._HotTrack;
}
set
{
this._HotTrack = value;
//在该值发生变化时重绘控件，下同
//在设计模式下，更改该属性时，如果不调用该语句，
//则不能立即看到设计试图中该控件相应的变化
this.Invalidate();
}
}
/// <summary>
/// 边框颜色
/// </summary>
[Category("外观"),
Description("获得或设置控件的边框颜色"),
DefaultValue(typeof(Color), "#A7A6AA")]
public Color BorderColor
{
get
{
return this._BorderColor;
}
set
{
this._BorderColor = value;
this.Invalidate();
}
}
/// <summary>
/// 热点时边框颜色
/// </summary>
[Category("外观"),
Description("获得或设置当鼠标经过控件时控件的边框颜色。只在控件的BorderStyle为FixedSingle时有效"),
DefaultValue(typeof(Color), "#335EA8")]
public Color HotColor
{
get
{
return this._HotColor;
}
set
{
this._HotColor = value;
this.Invalidate();
}
}
#endregion 属性
/// <summary>
///
/// </summary>
public TextBoxXP()
: base()
{
}
/// <summary>
/// 鼠标移动到该控件上时
/// </summary>
/// <param name="e"></param>
protected override void OnMouseMove(MouseEventArgs e)
{
//鼠标状态
this._IsMouseOver = true;
//如果启用HotTrack，则开始重绘
//如果不加判断这里不加判断，则当不启用HotTrack，
//鼠标在控件上移动时，控件边框会不断重绘，
//导致控件边框闪烁。下同
//谁有更好的办法？Please tell me , Thanks。
if (this._HotTrack)
{
//重绘
this.Invalidate();
}
base.OnMouseMove(e);
}
/// <summary>
/// 当鼠标从该控件移开时
/// </summary>
/// <param name="e"></param>
protected override void OnMouseLeave(EventArgs e)
{
this._IsMouseOver = false;
if (this._HotTrack)
{
//重绘
this.Invalidate();
}
base.OnMouseLeave(e);
}
/// <summary>
/// 当该控件获得焦点时
/// </summary>
/// <param name="e"></param>
protected override void OnGotFocus(EventArgs e)
{
if (this._HotTrack)
{
//重绘
this.Invalidate();
}
base.OnGotFocus(e);
}
/// <summary>
/// 当该控件失去焦点时
/// </summary>
/// <param name="e"></param>
protected override void OnLostFocus(EventArgs e)
{
if (this._HotTrack)
{
//重绘
this.Invalidate();
}
base.OnLostFocus(e);
}
/// <summary>
/// 获得操作系统消息
/// </summary>
/// <param name="m"></param>
protected override void WndProc(ref Message m)
{
base.WndProc(ref m);
if (m.Msg == 0xf || m.Msg == 0x133)
{
//拦截系统消息，获得当前控件进程以便重绘。
//一些控件（如TextBox、Button等）是由系统进程绘制，重载OnPaint方法将不起作用.
//所有这里并没有使用重载OnPaint方法绘制TextBox边框。
//
//MSDN:重写 OnPaint 将禁止修改所有控件的外观。
//那些由 Windows 完成其所有绘图的控件（例如 Textbox）从不调用它们的 OnPaint 方法，
//因此将永远不会使用自定义代码。请参见您要修改的特定控件的文档，
//查看 OnPaint 方法是否可用。如果某个控件未将 OnPaint 作为成员方法列出，
//则您无法通过重写此方法改变其外观。
//
//MSDN:要了解可用的 Message.Msg、Message.LParam 和 Message.WParam 值，
//请参考位于 MSDN Library 中的 Platform SDK 文档参考。可在 Platform SDK（“Core SDK”一节）
//下载中包含的 windows.h 头文件中找到实际常数值，该文件也可在 MSDN 上找到。
IntPtr hDC = GetWindowDC(m.HWnd);
if (hDC.ToInt32() == 0)
{
return;
}
//只有在边框样式为FixedSingle时自定义边框样式才有效
if (this.BorderStyle == BorderStyle.FixedSingle)
{
//边框Width为1个像素
System.Drawing.Pen pen = new Pen(this._BorderColor, 1); ;
if (this._HotTrack)
{
if (this.Focused)
{
pen.Color = this._HotColor;
}
else
{
if (this._IsMouseOver)
{
pen.Color = this._HotColor;
}
else
{
pen.Color = this._BorderColor;
}
}
}
//绘制边框
System.Drawing.Graphics g = Graphics.FromHdc(hDC);
g.SmoothingMode = System.Drawing.Drawing2D.SmoothingMode.AntiAlias;
g.DrawRectangle(pen, 0, 0, this.Width - 1, this.Height - 1);
pen.Dispose();
}
//返回结果
m.Result = IntPtr.Zero;
//释放
ReleaseDC(m.HWnd, hDC);
}
}
}
#endregion
/// <summary>
/// 第二种方法
/// </summary>
class borderDrawer : System.Windows.Forms.TextBox
{
private Color borderColor = Color.Red; // 设置默认的边框颜色
private static int WM_NCPAINT = 0x0085; // WM_NCPAINT message
private static int WM_ERASEBKGND = 0x0014; // WM_ERASEBKGND message
private static int WM_PAINT = 0x000F; // WM_PAINT message
[DllImport("user32.dll")]
static extern IntPtr GetDCEx(IntPtr hwnd, IntPtr hrgnclip, uint fdwOptions);
//释放DC
[DllImport("user32.dll")]
static extern int ReleaseDC(IntPtr hwnd, IntPtr hDC);
/// <summary>
/// 重绘边框的方法
/// </summary>
/// <param name="message"></param>
/// <param name="width"></param>
/// <param name="height"></param>
public void DrawBorder(ref Message message, int width, int height)
{
if (message.Msg == WM_NCPAINT || message.Msg == WM_ERASEBKGND ||
message.Msg == WM_PAINT)
{
IntPtr hdc = GetDCEx(message.HWnd, (IntPtr)1, 1 | 0x0020);
if (hdc != IntPtr.Zero)
{
Graphics graphics = Graphics.FromHdc(hdc);
Rectangle rectangle = new Rectangle(0, 0, width, height);
ControlPaint.DrawBorder(graphics, rectangle,
borderColor, ButtonBorderStyle.Solid);
message.Result = (IntPtr)1;
ReleaseDC(message.HWnd, hdc);
}
}
}
}
}
原文地址：https://www.cnblogs.com/belx/p/9193067.html
时间： 2024-07-29 17:14:22