C#仿QQ皮肤－ComboBox 控件实现
2010-09-30 22:44:29 来源：WEB开发网整个类的代码如下
using System;
using System.Collections.Generic;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using CRD.Common;
namespace CRD.WinUI.Misc
{
public class ComboBox : System.Windows.Forms.ComboBox
{
//鼠标Move事件时图片
private Image _mouseMoveImage = null;
//鼠标mouseDown事件时图片
private Image _mouseDownImage = null;
//
private Image _normalImage = null;
public ComboBox()
: base()
{
this.SetStyle(ControlStyles.OptimizedDoubleBuffer, true);
//设置为手动绘制
this.DrawMode = DrawMode.OwnerDrawFixed;
//设置固定的DropDownList样式
this.DropDownStyle = ComboBoxStyle.DropDownList;
this.UpdateStyles();
}
protected override void OnCreateControl()
{
base.OnCreateControl();
if (!DesignMode && this.Items.Count != 0)
{
this.DropDownHeight = this.Items.Count * 17;
}
ResetBitmap();
}
const int WM_ERASEBKGND = 0x14;
const int WM_PAINT = 0xF;
const int WM_NC_HITTEST = 0x84;
const int WM_NC_PAINT = 0x85;
const int WM_PRINTCLIENT = 0x318;
const int WM_SETCURSOR = 0x20;
protected override void WndProc(ref Message m)
{
IntPtr hDC = IntPtr.Zero;
Graphics gdc = null;
switch (m.Msg)
{
case 133:
hDC = Win32.GetWindowDC(m.HWnd);
gdc = Graphics.FromHdc(hDC);
Win32.SendMessage(this.Handle, WM_ERASEBKGND, hDC.ToInt32(), 0);
SendPrintClientMsg();
Win32.SendMessage(this.Handle, WM_PAINT, 0, 0);
OverrideControlBorder(gdc);
m.Result = (IntPtr)1; // indicate msg has been processed
Win32.ReleaseDC(m.HWnd, hDC);
gdc.Dispose();
break;
case WM_PAINT:
base.WndProc(ref m);
hDC = Win32.GetWindowDC(m.HWnd);
gdc = Graphics.FromHdc(hDC);
OverrideDropDown(gdc);
OverrideControlBorder(gdc);
Win32.ReleaseDC(m.HWnd, hDC);
gdc.Dispose();
break;
default:
base.WndProc(ref m);
break;
}
}
private static int DropDownButtonWidth = 17;
private void OverrideDropDown(Graphics g)
{
if (DesignMode) return;
Rectangle rect = new Rectangle(this.Width - DropDownButtonWidth, 0, DropDownButtonWidth, this.Height);
g.FillRectangle(new SolidBrush(Color.White), rect);
if (this.Enabled)
{
if (_mouseEnter)
{
g.DrawImage(this.MouseMoveImage, new Rectangle(this.Width - 20, 3, 16, 16));
}
else
{
g.DrawImage(this.NormalImage, new Rectangle(this.Width - 20, 3, 16, 16));
}
}
else
{
g.DrawImage(Shared.NotEnableDrawButton, new Rectangle(this.Width - 20, 3, 16, 16));
}
}
private Pen BorderPen = new Pen(Shared.ControlBorderBackColor, 2);
private Pen BorderPenControl = new Pen(Shared.ControlBorderBackColor, 2);
private void OverrideControlBorder(Graphics g)
{
g.DrawRectangle(new Pen(Shared.ControlBorderBackColor, 2), new Rectangle(0, 0, this.Width, this.Height));
}
private void SendPrintClientMsg()
{
// We send this message for the control to redraw the client area
Graphics gClient = this.CreateGraphics();
IntPtr ptrClientDC = gClient.GetHdc();
Win32.SendMessage(this.Handle, WM_PRINTCLIENT, ptrClientDC.ToInt32(), 0);
gClient.ReleaseHdc(ptrClientDC);
gClient.Dispose();
}
protected override void OnDrawItem(DrawItemEventArgs e)
{
Graphics g = e.Graphics;
//绘制区域
Rectangle r = e.Bounds;
Font fn = null;
if (e.Index >= 0)
{
if (e.State == DrawItemState.None)
{
//设置字体、字符串格式、对齐方式
fn = e.Font;
string s = this.Items[e.Index].ToString ();
StringFormat sf = new StringFormat();
sf.Alignment = StringAlignment.Near;
//根据不同的状态用不同的颜色表示
if (e.State == (DrawItemState.NoAccelerator | DrawItemState.NoFocusRect))
{
e.Graphics.FillRectangle(new SolidBrush(Color.Red), r);
e.Graphics.DrawString(s, fn, new SolidBrush(Color.Black), r, sf);
e.DrawFocusRectangle();
}
else
{
e.Graphics.FillRectangle(new SolidBrush(Color.White), r);
e.Graphics.DrawString(s, fn, new SolidBrush(Shared.FontColor), r, sf);
e.DrawFocusRectangle();
}
}
else
{
fn = e.Font;
StringFormat sf = new StringFormat();
sf.Alignment = StringAlignment.Near;
string s = this.Items[e.Index].ToString ();
e.Graphics.FillRectangle(new SolidBrush(Shared.ControlBackColor), r);
e.Graphics.DrawString(s, fn, new SolidBrush(Shared.FontColor), r, sf);
}
}
}
private bool _mouseEnter = false;
protected override void OnMouseEnter(EventArgs e)
{
_mouseEnter = true;
IntPtr hDC = IntPtr.Zero;
Graphics gdc = null;
hDC = Win32.GetWindowDC(this.Handle);
gdc = Graphics.FromHdc(hDC);
gdc.DrawImage(Shared.MouseMoveDrawButton, new Rectangle(this.Width - 20, 3, 16, 16));
Win32.ReleaseDC(this.Handle, hDC);
gdc.Dispose();
base.OnMouseEnter(e);
}
protected override void OnMouseLeave(EventArgs e)
{
_mouseEnter = false;
IntPtr hDC = IntPtr.Zero;
Graphics gdc = null;
hDC = Win32.GetWindowDC(this.Handle);
gdc = Graphics.FromHdc(hDC);
gdc.DrawImage(Shared.NomalDrawButton, new Rectangle(this.Width - 20, 3, 16, 16));
Win32.ReleaseDC(this.Handle, hDC);
base.OnMouseLeave(e);
}
public Image MouseMoveImage
{
get
{
return _mouseMoveImage;
}
set
{
_mouseMoveImage = value;
}
}
public Image MouseDownImage
{
get
{
return _mouseDownImage;
}
set
{
_mouseDownImage = value;
}
}
public Image NormalImage
{
get
{
return _normalImage;
}
set
{
_normalImage = value;
}
}
public void ResetBitmap()
{
this.NormalImage = Shared.NomalDrawButton;
this.MouseDownImage = Shared.MouseDownDrawButton;
this.MouseMoveImage = Shared.MouseMoveDrawButton;
}
}
}
出处：http://sufei.cnblogs.com/
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