MFC按钮CXPButton类，代码阅读起来还是挺不错的

在操手MFC的时候，经常会抱怨MFC界面不如其他的框架或语言，比如VB，C#等等，面对MS在系统上的不断更新换代，我们也越来越追求软件的视觉效果，譬如我们会更喜欢win7下的玻璃效果，看起来很炫。

在接触MFC的时候，实在忍不住对MFC的bulider的仰慕之情，因为他把之前的win32 c编程（注意，里面没有面向对象）和C++有机的结合起来了（这时OO跑进来了），让我们更多的专注于软件的功能设计方面，减少了程序繁杂（真心真诚的佩服win32走过来的那些来程序员们）。

每天都有新的收获，当然不仅仅是软件方面的，因为最近讲师在教我们设计自己的U，其实这个看起来还是蛮有难度的，实际上也很有难度，但是讲师说的没错，了解硬件上的架构只是，或许对于我们软件方面的同学来说，也是不无益处的。

上主题吧。

CXPButton类是一个很不错的按钮类，代码阅读起来也很简单，不是非常难，只要是我们对windows编程有所了解的话。难点也不多，主要是对鼠标消息的处理上，比如鼠标到了按钮的上面但是没有按下是什么情形，鼠标按钮按下了又是什么情形，这个都是要体现出来的呀，不然人机交互就苦难了，大众也不会喜欢的。

另外我觉得在美术的设计上也是挺有难度的，就是很多都知道什么什么样的东西看起来很酷，但是就不知道它怎么去设计，就是所谓的知其然而不起所以然。

 还有在消息的阅读上也有难度，比较生疏的地方就是，WM_MOUSELEAVE和WM_MOUSEHOVER这两个鼠标消息，windows默认是不处理这两个消息的，但是在自定义按钮过程当中又要用到它们。

所以要触发它们。

TRACKMOUSEEVENT tme;
tme.cbSize = sizeof(tme);
tme.hwndTrack = m_hWnd;
tme.dwFlags = TME_LEAVE | TME_HOVER;
tme.dwHoverTime = 1;
m_bTracking = _TrackMouseEvent(&tme);

上面的代码就是我们所需要的。当鼠标在按钮上停留或者走出按钮区域的话，就（才）会触发两个消息。

在CXPButton当中只要我们熟练如何运用GDI（再在加上一点点的艺术天分），便可以做出非常酷的按钮。

下面是源代码：

#if !defined(AFX_XPBUTTON_H__44CD5B2A_756E_4939_9261_E0034E0F2DEF__INCLUDED_)
#define AFX_XPBUTTON_H__44CD5B2A_756E_4939_9261_E0034E0F2DEF__INCLUDED_

#if _MSC_VER > 1000
#pragma once
#endif // _MSC_VER > 1000
// XPButton.h : header file
//

/////////////////////////////////////////////////////////////////////////////
// CXPButton window

class CXPButton : public CButton
{
// Construction
public:
	CXPButton();

	// Attributes
protected:
	//按钮的外边框
	CPen m_BoundryPen;
	
	//鼠标指针置于按钮之上时按钮的内边框
	CPen m_InsideBoundryPenLeft;
	CPen m_InsideBoundryPenRight;
	CPen m_InsideBoundryPenTop;
	CPen m_InsideBoundryPenBottom;
	
	//按钮获得焦点时按钮的内边框
	CPen m_InsideBoundryPenLeftSel;
	CPen m_InsideBoundryPenRightSel;
	CPen m_InsideBoundryPenTopSel;
	CPen m_InsideBoundryPenBottomSel;
	
	//按钮的底色，包括有效和无效两种状态
	CBrush m_FillActive;
	CBrush m_FillInactive;
	
	//按钮的状态
	BOOL m_bOver;	//鼠标位于按钮之上时该值为true，反之为flase
	BOOL m_bTracking;	//在鼠标按下没有释放时该值为true
	BOOL m_bSelected;	//按钮被按下是该值为true
	BOOL m_bFocus;	//按钮为当前焦点所在时该值为true

// Operations
public:

// Overrides
	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CXPButton)
	protected:
	virtual void PreSubclassWindow();
	//}}AFX_VIRTUAL

// Implementation
public:
	virtual void DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct);
	virtual void DoGradientFill(CDC *pDC, CRect* rect);
	virtual void DrawInsideBorder(CDC *pDC, CRect* rect);
	virtual ~CXPButton();

	// Generated message map functions
protected:
	//{{AFX_MSG(CXPButton)
	afx_msg void OnMouseMove(UINT nFlags, CPoint point);
	afx_msg LRESULT OnMouseLeave(WPARAM wParam, LPARAM lParam);
	afx_msg LRESULT OnMouseHover(WPARAM wParam, LPARAM lParam);
	
	//}}AFX_MSG

	DECLARE_MESSAGE_MAP()
};

/////////////////////////////////////////////////////////////////////////////

//{{AFX_INSERT_LOCATION}}
// Microsoft Visual C++ will insert additional declarations immediately before the previous line.

#endif // !defined(AFX_XPBUTTON_H__44CD5B2A_756E_4939_9261_E0034E0F2DEF__INCLUDED_)

　　

// XPButton.cpp : implementation file
//

#include "stdafx.h"
#include "XPButton.h"
#include "resource.h"
#ifdef _DEBUG
#define new DEBUG_NEW
#undef THIS_FILE
static char THIS_FILE[] = __FILE__;
#endif

/////////////////////////////////////////////////////////////////////////////
// CXPButton

CXPButton::CXPButton()
{
	m_BoundryPen.CreatePen(PS_INSIDEFRAME | PS_SOLID, 1, RGB(0, 0, 0));
	m_InsideBoundryPenLeft.CreatePen(PS_INSIDEFRAME | PS_SOLID, 3, RGB(250, 196, 88)); 
	m_InsideBoundryPenRight.CreatePen(PS_INSIDEFRAME | PS_SOLID, 3, RGB(251, 202, 106));
	m_InsideBoundryPenTop.CreatePen(PS_INSIDEFRAME | PS_SOLID, 2, RGB(252, 210, 121));
	m_InsideBoundryPenBottom.CreatePen(PS_INSIDEFRAME | PS_SOLID, 2, RGB(229, 151, 0));
	
	m_FillActive.CreateSolidBrush(RGB(223, 222, 236));
	m_FillInactive.CreateSolidBrush(RGB(222, 223, 236));
	
	m_InsideBoundryPenLeftSel.CreatePen(PS_INSIDEFRAME | PS_SOLID, 3, RGB(153, 198, 252)); 
	m_InsideBoundryPenTopSel.CreatePen(PS_INSIDEFRAME | PS_SOLID, 2, RGB(162, 201, 255));
	m_InsideBoundryPenRightSel.CreatePen(PS_INSIDEFRAME | PS_SOLID, 3, RGB(162, 189, 252));
	m_InsideBoundryPenBottomSel.CreatePen(PS_INSIDEFRAME | PS_SOLID, 2, RGB(162, 201, 255));
	
	m_bOver = m_bSelected = m_bTracking = m_bFocus = FALSE;
	
}

CXPButton::~CXPButton()
{
	m_BoundryPen.DeleteObject();
	m_InsideBoundryPenLeft.DeleteObject();
	m_InsideBoundryPenRight.DeleteObject();
	m_InsideBoundryPenTop.DeleteObject();
	m_InsideBoundryPenBottom.DeleteObject();
	
	m_FillActive.DeleteObject();
	m_FillInactive.DeleteObject();
	
	m_InsideBoundryPenLeftSel.DeleteObject();
	m_InsideBoundryPenTopSel.DeleteObject();
	m_InsideBoundryPenRightSel.DeleteObject();
	m_InsideBoundryPenBottomSel.DeleteObject();
	
}


BEGIN_MESSAGE_MAP(CXPButton, CButton)
	//{{AFX_MSG_MAP(CXPButton)
	ON_WM_MOUSEMOVE()
	ON_MESSAGE(WM_MOUSELEAVE, OnMouseLeave)
	ON_MESSAGE(WM_MOUSEHOVER, OnMouseHover)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CXPButton message handlers

//添加Owner Draw属性
void CXPButton::PreSubclassWindow() 
{
	// TODO: Add your specialized code here and/or call the base class
	
	CButton::PreSubclassWindow();
	ModifyStyle(0, BS_OWNERDRAW);
}

void CXPButton::OnMouseMove(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default
	if (!m_bTracking)
	{
		TRACKMOUSEEVENT tme;
		tme.cbSize = sizeof(tme);
		tme.hwndTrack = m_hWnd;
		tme.dwFlags = TME_LEAVE | TME_HOVER;
		tme.dwHoverTime = 1;
		m_bTracking = _TrackMouseEvent(&tme);
	}
	
	CButton::OnMouseMove(nFlags, point);
}


LRESULT CXPButton::OnMouseLeave(WPARAM wParam, LPARAM lParam)
{
	m_bOver = FALSE;
	m_bTracking = FALSE;
	InvalidateRect(NULL, FALSE);/**/
	return 0;
}

LRESULT CXPButton::OnMouseHover(WPARAM wParam, LPARAM lParam)
{
	m_bOver = TRUE;
	InvalidateRect(NULL);
	return 0;
}


void CXPButton::DrawItem(LPDRAWITEMSTRUCT lpDrawItemStruct)
{
	//从lpDrawItemStruct获取控件的相关信息
	CRect rect =  lpDrawItemStruct->rcItem;
	CDC *pDC=CDC::FromHandle(lpDrawItemStruct->hDC);
	int nSaveDC=pDC->SaveDC();
	UINT state = lpDrawItemStruct->itemState;
	POINT pt ;
	TCHAR strText[MAX_PATH + 1] = L"我爱你";
	::GetWindowText(m_hWnd, strText, MAX_PATH);/*获取文本原色*/
	
	//画按钮的外边框，它是一个半径为5的圆角矩形
	pt.x = 5;
	pt.y = 5;
	CPen* hOldPen = pDC->SelectObject(&m_BoundryPen);
	pDC->RoundRect(&rect, pt);
	
	//获取按钮的状态
	if (state & ODS_FOCUS)
	{
		m_bFocus = TRUE;
		m_bSelected = TRUE;
	}
	else
	{
		m_bFocus = FALSE;
		m_bSelected = FALSE;
	}
	
	
	if (state & ODS_SELECTED || state & ODS_DEFAULT)
	{
		m_bFocus = TRUE;
	}

	
	pDC->SelectObject(hOldPen);
	
	rect.DeflateRect(CSize(GetSystemMetrics(SM_CXEDGE), GetSystemMetrics(SM_CYEDGE)));
	
	//根据按钮的状态填充按钮的底色
	CBrush* pOldBrush;
	if (m_bOver)
	{
		pOldBrush = pDC->SelectObject(&m_FillActive);
		DoGradientFill(pDC, &rect);
	}
	else
	{
		pOldBrush = pDC->SelectObject(&m_FillInactive);
		DoGradientFill(pDC, &rect);
	}
	
	//根据按钮的状态绘制内边框
	if (m_bOver || m_bSelected)
		DrawInsideBorder(pDC, &rect);
				
	pDC->SelectObject(pOldBrush);
	
	//显示按钮的文本
	if (strText!=NULL)
	{
		CFont* hFont = GetFont();
		CFont* hOldFont = pDC->SelectObject(hFont);
		CSize szExtent = pDC->GetTextExtent(strText, lstrlen(strText));
		CPoint pt( rect.CenterPoint().x - szExtent.cx / 2, rect.CenterPoint().y - szExtent.cy / 2);
		if (state & ODS_SELECTED) 
			pt.Offset(1, 1);
		int nMode = pDC->SetBkMode(TRANSPARENT);
		if (state & ODS_DISABLED)
			pDC->DrawState(pt, szExtent, strText, DSS_DISABLED, TRUE, 0, (HBRUSH)NULL);
		else
			pDC->DrawState(pt, szExtent, strText, DSS_NORMAL, TRUE, 0, (HBRUSH)NULL);
		pDC->SelectObject(hOldFont);
		pDC->SetBkMode(nMode);
	}
	
	
	pDC->RestoreDC(nSaveDC);
}

//绘制按钮的底色
void CXPButton::DoGradientFill(CDC *pDC, CRect* rect)
{
	CBrush brBk[64];
	int nWidth = rect->Width();	
	int nHeight = rect->Height();
	CRect rct;
	
	/*for (int i = 0; i < 64; i ++)
	{
		if (m_bOver)
		{
			if (m_bFocus)
				brBk[i].CreateSolidBrush(RGB(255 - (i / 4), 255 - (i / 4), 255 - (i / 3)));
			else
				brBk[i].CreateSolidBrush(RGB(255 - (i / 4), 255 - (i / 4), 255 - (i / 5)));
		}
		else
		{
			if (m_bFocus)
				brBk[i].CreateSolidBrush(RGB(255 - (i / 3), 255 - (i / 3), 255 - (i / 4)));
			else
				brBk[i].CreateSolidBrush(RGB(255 - (i / 3), 255 - (i / 3), 255 - (i / 5)));
		}
	}
	
	int i;
	for (i = rect->top; i <= nHeight + 2; i ++) 
	{
		rct.SetRect(rect->left, i, nWidth + 2, i + 1);
		pDC->FillRect(&rct, &brBk[((i * 63) / nHeight)]);
	}*/
	int i;
	brBk[0].CreateSolidBrush(RGB(255,0,0));
	brBk[1].CreateSolidBrush(RGB(0,0,0));
	brBk[2].CreateSolidBrush(RGB(0,0,255));
	brBk[3].CreateSolidBrush(RGB(0,255,0));

	CBitmap bitmap;
	BITMAP bmp;
	bitmap.LoadBitmapW(IDB_QQ);
	bitmap.GetBitmap(&bmp);
	CDC MemDC;
	MemDC.CreateCompatibleDC(pDC);

	if(m_bOver)
	{
		CBitmap * OldBitmap = MemDC.SelectObject(&bitmap);
		pDC->BitBlt(0,0,bmp.bmWidth,bmp.bmHeight,&MemDC,0,0,SRCAND);
		MemDC.SelectObject(OldBitmap);
		/*if(m_bFocus)//鼠标+焦点
			pDC ->FillRect(rect,&brBk[0]);//红
		else//鼠标+无焦点
			pDC ->FillRect(rect,&brBk[1]);//黑*/
	}
	else
	{
		CBitmap * OldBitmap = MemDC.SelectObject(&bitmap);
		pDC->StretchBlt(0,0,bmp.bmWidth+10,bmp.bmHeight+10,&MemDC,
			0,0,bmp.bmWidth,bmp.bmHeight,SRCAND);
		MemDC.SelectObject(OldBitmap);
		/*if(m_bFocus)//无鼠标+焦点
			pDC ->FillRect(rect,&brBk[2]);//蓝
		else
			pDC ->FillRect(rect,&brBk[3]);//绿*/

	}

	
	/*for (i = 0; i< 64; i ++)
		brBk[i].DeleteObject();*/
}


//绘制按钮的内边框
void CXPButton::DrawInsideBorder(CDC *pDC, CRect* rect)
{
	CPen *pLeft, *pRight, *pTop, *pBottom;
	
	if (m_bSelected && !m_bOver)
	{
		pLeft = & m_InsideBoundryPenLeftSel;
		pRight = &m_InsideBoundryPenRightSel;
		pTop = &m_InsideBoundryPenTopSel;
		pBottom = &m_InsideBoundryPenBottomSel;
	}
	else
	{
		pLeft = &m_InsideBoundryPenLeft;
		pRight = &m_InsideBoundryPenRight;
		pTop = &m_InsideBoundryPenTop;
		pBottom = &m_InsideBoundryPenBottom;
	}
	
	CPoint oldPoint = pDC->MoveTo(rect->left, rect->bottom - 1);
	CPen* pOldPen = pDC->SelectObject(pLeft);
	pDC->LineTo(rect->left, rect->top + 1);
	pDC->SelectObject(pRight);
	pDC->MoveTo(rect->right - 1, rect->bottom - 1);
	pDC->LineTo(rect->right - 1, rect->top);
	pDC->SelectObject(pTop);
	pDC->MoveTo(rect->left - 1, rect->top);
	pDC->LineTo(rect->right - 1, rect->top);
	pDC->SelectObject(pBottom);
	pDC->MoveTo(rect->left, rect->bottom);
	pDC->LineTo(rect->right - 1, rect->bottom);
	pDC->SelectObject(pOldPen);
	pDC->MoveTo(oldPoint);

	if (m_bSelected && !m_bOver)
		DrawFocusRect(pDC->m_hDC,rect);
}