按钮控件

开发平台：
Visual C++

HoverButton.cpp：源码内容
							// HoverButton.cpp : implementation file
//
#include "stdafx.h"
#include "HoverDlg.h"
#include "HoverButton.h"
#include "HoverButtonGroup.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif
/////////////////////////////////////////////////////////////////////////////
// CHoverButton
BEGIN_MESSAGE_MAP(CHoverButton, CBitmapButton)
	//{{AFX_MSG_MAP(CHoverButton)
	ON_WM_MOUSEMOVE()
	ON_WM_LBUTTONUP()
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()
/////////////////////////////////////////////////////////////////////////////
// CHoverButton construction / destruction
CHoverButton::CHoverButton()
{
	// To start with, the button is switched off and we are NOT tracking the mouse
	m_ButtonState		= BUTTON_OFF;
	m_bMouseTracking	= FALSE;
	m_pOwnerGroup = NULL;
}
CHoverButton::~CHoverButton()
{
}
/////////////////////////////////////////////////////////////////////////////
// CHoverButton message handlers
void CHoverButton::OnMouseMove(UINT nFlags, CPoint point) 
{
	CBitmapButton::OnMouseMove(nFlags, point);
	// 1. Mouse has moved and we are not tracking this button, or 
	// 2. mouse has moved and the cursor was not above this window
	// == Is equivalent to WM_MOUSEENTER (for which there is no message)
	if((!m_bMouseTracking || GetCapture()!=this) && (m_ButtonState == BUTTON_OFF))
	{
		OnMouseEnter();
	}
	else 
	{
		if(m_ButtonState == BUTTON_OVER)
		{
			CRect rc;
			GetClientRect(&rc);
			if(!rc.PtInRect(point))	// The mouse cursor is no longer above this button
				OnMouseLeave();
		}
	}
}
void CHoverButton::OnMouseEnter(void)
{
	// We are now tracking the mouse, OVER this button
	m_bMouseTracking = TRUE;
	m_ButtonState = BUTTON_OVER;
	// Ensure that mouse input is sent to the button
	SetCapture();
	Invalidate();
	UpdateWindow();
}
void CHoverButton::OnMouseLeave(void)
{
	// We are not tracking the mouse, this button is OFF.
	m_ButtonState = BUTTON_OFF;
	m_bMouseTracking = FALSE;
	// Release mouse capture from the button and restore normal mouse input
	Invalidate();
	UpdateWindow();
	ReleaseCapture();
}
void CHoverButton::OnLButtonUp(UINT nFlags, CPoint point) 
{
	SetButtonState(BUTTON_ON);			// Highlight button
	CBitmapButton::OnLButtonUp(nFlags, point);
	if (m_pOwnerGroup)
	{
		m_pOwnerGroup->ButtonClicked(this);
	}
}
// Purpose:		Set the new state of the button 
// Return:		Returns the old state of the button
// Parameters:	nState = Either ON or OFF. The default is OFF. This is NOT tri-state button!
BUTTON_STATE CHoverButton::SetButtonState(BUTTON_STATE nState) 
{
	BUTTON_STATE nOldState = (BUTTON_STATE)GetCheck();
	
	m_ButtonState = nState;
	switch(m_ButtonState)
	{
	case BUTTON_ON:
		EnableWindow(TRUE);
		SetState(BUTTON_ON);
		if (m_pOwnerGroup)
		{
			m_pOwnerGroup->ButtonClicked(this);
		}
		break;
	case BUTTON_GREYED:
		EnableWindow(FALSE);
		break;
	case BUTTON_OVER:
		EnableWindow(TRUE);
		SetState(BUTTON_OVER);
		break;
	default:
		EnableWindow(TRUE);
		SetState(BUTTON_OFF);
		m_ButtonState = BUTTON_OFF;
		break;
	}
	return(nOldState);
}
// Draws the buttons in their relevant state, and text labels
void CHoverButton::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct) 
{
	CDC			memDC;
	CBitmap*	pOld=NULL;
	CBitmap*	pBitmap=NULL;
	CDC*		pDC;
	CRect		rc;
	int			iSaveDC;
	pDC= CDC::FromHandle(lpDrawItemStruct->hDC);
	memDC.CreateCompatibleDC(pDC);
	VERIFY(pDC);
	iSaveDC=pDC->SaveDC();
	rc.CopyRect(&lpDrawItemStruct->rcItem);
	pDC->SetBkMode(TRANSPARENT);
	pDC->SetTextColor(GetSysColor(COLOR_WINDOWFRAME));// Black text color
	switch(m_ButtonState)
	{
	case BUTTON_ON:
		pBitmap=&m_bmpButtonDown;
		break;
	case BUTTON_OVER:
		pBitmap=&m_bmpButtonFocussed;
		break;
	case BUTTON_GREYED:
		pBitmap=&m_bmpButtonDisabled;
		break;
	default:
		pBitmap=&m_bmpButtonUp;
		break;
	}
	CString		strTitle;
	GetWindowText(strTitle);
	if (pBitmap->m_hObject)
	{
		CRect	rcBitmap(rc);
		BITMAP	bmpInfo;			
		CSize	size;
		// Text
		size = pDC->GetTextExtent(strTitle);
		rcBitmap.OffsetRect(size.cx+5,0);
		// Draw bitmap
		if(!pBitmap->GetBitmap(&bmpInfo))
			return;
		pOld=memDC.SelectObject((CBitmap*) pBitmap);
		if (pOld==NULL) 
			return; //Destructors will clean up
		if(!pDC->BitBlt(0, 0, rc.Width(), rc.Height(), &memDC, 0, 0, SRCCOPY))
			return;
		memDC.SelectObject(pOld);	
		if(memDC==NULL)
			return;
	}
	CRect	rcText(rc);
	UINT nFormat = DT_CENTER;
	if(m_ButtonState == BUTTON_GREYED)
	{
		rcText.OffsetRect(1,1);
		pDC->SetTextColor(GetSysColor(COLOR_BTNHIGHLIGHT));
		pDC->DrawText(strTitle,rcText,nFormat);
		rcText.OffsetRect(-1,-1);
		pDC->SetTextColor(GetSysColor(COLOR_BTNSHADOW));
		pDC->DrawText(strTitle,rcText,nFormat);
	} 
	else
		pDC->DrawText(strTitle,rcText,nFormat);
	pDC->RestoreDC(iSaveDC);
}
BOOL CHoverButton::LoadBitmaps(UINT nBitmapUp, UINT nBitmapDown, 
							   UINT nBitmapFocus, UINT nBitmapDisabled)
{
	return LoadBitmaps(MAKEINTRESOURCE(nBitmapUp),
						MAKEINTRESOURCE(nBitmapDown),
						MAKEINTRESOURCE(nBitmapFocus),
						MAKEINTRESOURCE(nBitmapDisabled));
}
BOOL CHoverButton::LoadBitmaps(LPCSTR lpszBitmapUp, LPCSTR lpszBitmapDown, 
							   LPCSTR lpszBitmapFocus, LPCSTR lpszBitmapDisabled)
{
	BOOL bAllLoaded=TRUE;
	//Delete old ones
	m_bmpButtonDown.DeleteObject();
	m_bmpButtonFocussed.DeleteObject();
	m_bmpButtonUp.DeleteObject();
	m_bmpButtonDisabled.DeleteObject();
	
	if (!m_bmpButtonUp.LoadBitmap(lpszBitmapUp))
	{
		TRACE0("Failed to load up bitmap of bitmap buttonn");
		return FALSE;
	}
	if (lpszBitmapDown!=NULL)
	{
		if (!m_bmpButtonDown.LoadBitmap(lpszBitmapDown))
		{
			TRACE0("Failed to load down bitmap of bitmap buttonn");
			return bAllLoaded=FALSE;
		}
	}
	
	if (lpszBitmapFocus!=NULL)
	{
		if (!m_bmpButtonFocussed.LoadBitmap(lpszBitmapFocus))
		{
			TRACE0("Failed to load focussed bitmap of bitmap buttonn");
			return bAllLoaded=FALSE;
		}
	}
	
	if (lpszBitmapDisabled!=NULL)
	{
		if (!m_bmpButtonDisabled.LoadBitmap(lpszBitmapDisabled))
		{
			TRACE0("Failed to load disabled bitmap of bitmap buttonn");
			return bAllLoaded=FALSE;
		}
	}
	return bAllLoaded;
}
void CHoverButton::PreSubclassWindow() 
{
	LoadBitmaps(IDB_RBU, IDB_RBD, IDB_RBF, IDB_RBX);
	
	CBitmapButton::PreSubclassWindow();
}

						