如何让下拉框随鼠标位置显示为平面或三维。

[ljn2]

就是所谓热感应控件。有没有简单的方法。

[huanyun]

http://www.vckbase.com/code/listcode.asp?mclsid=3&sclsid=315

[qrlvls]

// FlatComboBox.cpp : implementation file
//
// Copyright ?1998 Kirk Stowell
// All Rights Reserved.
//
// Email: [e-mail]
// URL: www.geocities.com/SiliconValley/Haven/8230
//
// This code may be used in compiled form in any way you desire. This
// file may be redistributed unmodified by any means PROVIDING it is
// not sold for profit without the authors written consent, and
// providing that this notice and the authors name and all copyright
// notices remains intact. If the source code in this file is used in
// any commercial application then a statement along the lines of
// "Portions Copyright ?1998 Kirk Stowell" must be included in
// the startup banner, "About" box or printed documentation. An email
// letting me know that you are using it would be nice as well. That's
// not much to ask considering the amount of work that went into this.
//
// This file is provided "as is" with no expressed or implied warranty.
// The author accepts no liability for any damage/loss of business that
// this product may cause.
//
// Expect bugs!
//
// Please use and enjoy, and let me know of any bugs/mods/improvements
// that you have found/implemented and I will fix/incorporate them into
// this file.
//
// History:
// --------
// This control is constantly evolving, sometimes due to new features that I
// feel are necessary, and sometimes due to existing bugs. Where possible I
// have credited the changes to those who contributed code corrections or
// enhancements (names in brackets) or code suggestions (suggested by...)
//
// 1.0 02 Oct 1998 First release version.
// 1.01 05 Oct 1998 Fixed cross platform offset bug (Todd Brannam)
// to use GetSystemMetrics(), instead of hard coded values.
//
/////////////////////////////////////////////////////////////////////////////

#include "stdafx.h"
#include "LSComboBox.h"

#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CLSComboBox

CLSComboBox::CLSComboBox()
{
m_bLBtnDown = false;
m_bAutoFocus = TRUE;
m_clr3DFace = GetSysColor(COLOR_3DFACE);
m_clr3DLight = GetSysColor(COLOR_3DLIGHT);
m_clr3DHilight = GetSysColor(COLOR_3DHILIGHT);
m_clr3DShadow = GetSysColor(COLOR_3DSHADOW);
m_clr3DDkShadow = GetSysColor(COLOR_3DDKSHADOW);
m_clrText = GetSysColor(COLOR_WINDOWTEXT);
m_clrBackground = GetSysColor(COLOR_WINDOW);
}

CLSComboBox::~CLSComboBox()
{
}

BEGIN_MESSAGE_MAP(CLSComboBox, CComboBox)
//{{AFX_MSG_MAP(CLSComboBox)
ON_WM_MOUSEMOVE()
ON_WM_LBUTTONDOWN()
ON_WM_LBUTTONUP()
ON_WM_TIMER()
ON_WM_PAINT()
//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CLSComboBox message handlers

void CLSComboBox::OnMouseMove(UINT nFlags, CPoint point)
{
SetTimer(1, 10, NULL);
CComboBox::OnMouseMove(nFlags, point);
}

void CLSComboBox::OnLButtonDown(UINT nFlags, CPoint point)
{
m_bLBtnDown = true;
CComboBox::OnLButtonDown(nFlags, point);
}

void CLSComboBox::OnLButtonUp(UINT nFlags, CPoint point)
{
m_bLBtnDown = false;
Invalidate();
CComboBox::OnLButtonUp(nFlags, point);
}

void CLSComboBox::OnTimer(UINT nIDEvent)
{
POINT pt;
CRect rcItem;
static bool bPainted = false;

GetCursorPos(&pt);
GetWindowRect(&rcItem);


if (m_bLBtnDown==true) // 如果鼠标左键按下
{
KillTimer (1);
if (bPainted == true)
{
DrawCombo(FC_DRAWPRESSD, m_clr3DHilight, m_clr3DHilight);
bPainted = false;
}
return;
}

if (!rcItem.PtInRect(pt)) // 如果鼠标在组合框外
{
KillTimer (1);
if (bPainted == true)
{
DrawCombo(FC_DRAWNORMAL, m_clr3DFace, m_clr3DFace);
bPainted = false;
}
return;
}
else // 如果鼠标在组合框内
{
if (bPainted == true)
return;
else
{
bPainted = true;
if(m_bAutoFocus)
{
SetFocus();
DrawCombo(FC_DRAWRAISED, m_clr3DHilight, m_clr3DHilight);
}
else
DrawCombo(FC_DRAWRAISED, m_clr3DFace, m_clr3DFace);
}
}

CComboBox::OnTimer(nIDEvent);
}

void CLSComboBox::OnPaint()
{
Default();
DrawCombo(FC_DRAWNORMAL, m_clr3DFace, m_clr3DFace);
}

void CLSComboBox::DrawCombo(DWORD dwStyle, COLORREF clrTopLeft, COLORREF clrBottomRight)
{
CRect rcItem;
GetClientRect(&rcItem);
CDC* pDC = GetDC();

pDC->Draw3dRect(rcItem, clrTopLeft, clrBottomRight);
rcItem.DeflateRect(1,1);

if (!IsWindowEnabled())
{
pDC->Draw3dRect(rcItem, m_clr3DHilight, m_clr3DHilight);
rcItem.DeflateRect(1,1);
rcItem.left = rcItem.right-Offset();
pDC->Draw3dRect(rcItem, m_clr3DFace, m_clr3DFace);
rcItem.DeflateRect(1,1);
pDC->Draw3dRect(rcItem, m_clr3DFace, m_clr3DFace);

rcItem.top--;
rcItem.left--;
rcItem.right++;
rcItem.bottom++;
pDC->Draw3dRect(rcItem, m_clr3DHilight, m_clr3DHilight);
return;
}

switch (dwStyle)
{
case FC_DRAWNORMAL:
pDC->Draw3dRect(rcItem, m_clr3DShadow, m_clr3DShadow);

rcItem.DeflateRect(1,1);
rcItem.left = rcItem.right-Offset();
pDC->Draw3dRect(rcItem, m_clr3DFace, m_clr3DFace);
rcItem.DeflateRect(1,1);
pDC->Draw3dRect(rcItem, m_clr3DFace, m_clr3DFace);

rcItem.top --;
rcItem.bottom ++;
pDC->Draw3dRect(rcItem, m_clr3DHilight, m_clr3DShadow);
rcItem.left --;
pDC->Draw3dRect(rcItem, m_clr3DFace, m_clr3DFace);
break;

case FC_DRAWRAISED:
pDC->Draw3dRect(rcItem, m_clr3DDkShadow, m_clr3DDkShadow); //边框

rcItem.DeflateRect(1,1);
rcItem.left = rcItem.right-Offset();
pDC->Draw3dRect(rcItem, m_clr3DFace, m_clr3DFace);
rcItem.DeflateRect(1,1);
pDC->Draw3dRect(rcItem, m_clr3DFace, m_clr3DFace);

rcItem.top--;
rcItem.left--;
rcItem.right++;
rcItem.bottom++;
pDC->Draw3dRect(rcItem, m_clr3DHilight, m_clr3DHilight);
break;

case FC_DRAWPRESSD:
pDC->Draw3dRect(rcItem, m_clr3DDkShadow, m_clr3DDkShadow);

rcItem.DeflateRect(1,1);
rcItem.left = rcItem.right-Offset();
pDC->Draw3dRect(rcItem, m_clr3DFace, m_clr3DFace);
rcItem.DeflateRect(1,1);
pDC->Draw3dRect(rcItem, m_clr3DFace, m_clr3DFace);

rcItem.top--;
rcItem.left--;
rcItem.right++;
rcItem.bottom++;
pDC->Draw3dRect(rcItem, m_clr3DShadow, m_clr3DShadow);
break;
}

ReleaseDC(pDC);
}

int CLSComboBox::Offset()
{
return ::GetSystemMetrics(SM_CXHTHUMB);
}

void CLSComboBox::SetAutoFocus(BOOL bAutoFocs)
{
m_bAutoFocus = bAutoFocs;
}

[ljn2]

很好用，谢谢。