[转载]设置TextBox边框颜色

http://www.cnblogs.com/bensoft/articles/239971.html

自由使用,转载注明出处。Ben.Hui<BenSoftCN#Gmail.Com>

TextBoxXP.cs

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using System;
using System.ComponentModel;
using System.Collections;
using System.Diagnostics;
using System.Windows.Forms;
using System.Drawing;
using System.Drawing.Drawing2D;
namespace BenSoftCN.WinForms.UI
{
    [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.FromArgb(0xA7,0xA6,0xAA);
/// <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);
            }
        }
    }
}

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原文地址:https://www.cnblogs.com/oneisyou/p/1764406.html