本文实例讲述了C#通过重写Panel改变边框颜色与宽度的方法。分享给大家供大家参考。具体实现方法如下:
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using System;
using System.Collections.Generic;
using System.Text;
using System.Runtime.InteropServices;
using System.ComponentModel;
using System.Windows.Forms;
using System.Drawing;
namespace ImageStudio
{ public class PanelEx : System.Windows.Forms.Panel
{
[DllImport( "user32.dll" )]
private static extern IntPtr GetWindowDC(IntPtr hwnd);
[DllImport( "user32.dll" )]
private static extern int ReleaseDC(IntPtr hwnd, IntPtr hdc);
private Color _borderColor = Color.Black;
private int _borderWidth = 1;
//
// 摘要:
// 获取或设置控件的边框颜色。
//
// 返回结果:
// 控件的边框颜色 System.Drawing.Color。默认为 System.Drawing.Color.Black
// 属性的值。
[Description( "组件的边框颜色。" ), Category( "Appearance" )]
public Color BorderColor
{
get
{
return _borderColor;
}
set
{
_borderColor = value;
this .Invalidate();
}
}
//
// 摘要:
// 获取或设置控件的边框宽度。
//
// 返回结果:
// 控件的边框宽度 int。默认为 1
// 属性的值。
[Description( "组件的边框宽度。" ), Category( "Appearance" )]
public int BorderWidth
{
get
{
return _borderWidth;
}
set
{
_borderWidth = value;
this .Invalidate();
}
}
public PanelEx()
{
SetStyle(ControlStyles.DoubleBuffer, true );
SetStyle(ControlStyles.AllPaintingInWmPaint, false );
SetStyle(ControlStyles.ResizeRedraw, true );
SetStyle(ControlStyles.UserPaint, true );
SetStyle(ControlStyles.SupportsTransparentBackColor, true );
this .Paint+= new PaintEventHandler(PanelEx_Paint);
}
private void PanelEx_Paint( object sender, PaintEventArgs e)
{
if ( this .BorderStyle == BorderStyle.FixedSingle)
{
IntPtr hDC = GetWindowDC( this .Handle);
Graphics g = Graphics.FromHdc(hDC);
ControlPaint.DrawBorder(
g,
new Rectangle(0, 0, this .Width, this .Height),
_borderColor,
_borderWidth,
ButtonBorderStyle.Solid,
_borderColor,
_borderWidth,
ButtonBorderStyle.Solid,
_borderColor,
_borderWidth,
ButtonBorderStyle.Solid,
_borderColor,
_borderWidth,
ButtonBorderStyle.Solid);
g.Dispose();
ReleaseDC(Handle, hDC);
}
}
}
} |
希望本文所述对大家的C#程序设计有所帮助。