轻松实现非客户区按钮

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一、简介

有时我们需要在非客户区（例如：标题栏）添加按钮，并对按钮作出响应，如下图所示：



为此我封装了两个类CNCButton和CNCButtonManager，CNCButton主要用于按钮绘制，CNCButtonManager用于按钮的管理并对非客户区的消息进行处理。如下是几个主要的非客户区消息：
WM_NCHITTEST
WM_NCACTIVATE
WM_NCPAINT

二、使用

2.1 首先我们需要引用两个类的头文件

#include "NCButtonManager.h"

#include "NCButton.h"

2.2 为按钮定义ID

#define ID_BUTTON1  100

#define ID_BUTTON2  101

#define ID_BUTTON3  102

2.3 添加按钮和管理类成员变量

// Implementation

public:

	CNCButton m_NcButton1;

	CNCButton m_NcButton2;

	CNCButton m_NcButton3;

	CNCButtonManager m_NcButtonManager;

2.4 创建按钮

// 按钮的位置和尺寸

POINT ptBtn1Offset = {120, 10};

POINT ptBtn2Offset = {20, 32};

POINT ptBtn3Offset = {190, 10};

SIZE sizeBtn1 = {60, 14};

SIZE sizeBtn2 = {16, 14};

SIZE sizeBtn3 = {16, 14};



// 创建按钮

m_NcButton1.Create("", this->m_hWnd, ptBtn1Offset, sizeBtn1, ID_BUTTON1);

m_NcButton2.Create("", this->m_hWnd, ptBtn2Offset, sizeBtn2, ID_BUTTON2);

m_NcButton3.Create("", this->m_hWnd, ptBtn3Offset, sizeBtn3, ID_BUTTON3);

	

// 设置文字、提示、按钮位图

m_NcButton1.SetText("VC知识库", "宋体", 12);

m_NcButton1.SetTooltip("VC知识库欢迎您!");

m_NcButton2.SetButtonBitmap(IDB_PEN1, BTNBMP_NORMAL); // 正常位图

m_NcButton2.SetButtonBitmap(IDB_PEN2, BTNBMP_MOUSEOVER); // 鼠标移到上面时的位图

m_NcButton2.SetTooltip("pen");



m_NcButton3.SetButtonBitmap(IDB_PEN1, BTNBMP_NORMAL);

m_NcButton3.SetButtonBitmap(IDB_PEN2, BTNBMP_MOUSEOVER);

m_NcButton3.SetTooltip("pen");



// 添加到管理类

m_NcButtonManager.AddButton(&m_NcButton1);

m_NcButtonManager.AddButton(&m_NcButton2);

m_NcButtonManager.AddButton(&m_NcButton3);

2.5 消息的处理

2.5.1 将消息转发给管理类

LRESULT CMainFrame::DefWindowProc(UINT message, WPARAM wParam, LPARAM lParam) 

{	

	LRESULT lResult = CFrameWnd::DefWindowProc(message, wParam, lParam);

	if(!IsWindow(this->m_hWnd))

		return lResult;



	LRESULT lMyResult = m_NcButtonManager.DefWindowProc(this->m_hWnd, message, wParam, lParam);

	if(lMyResult != 0)

		return lMyResult;

	else

		return lResult;	

}

2.5.2 添加消息处理函数

// Operations

public:

	void OnNcButton1Clicked();



void CMainFrame::OnNcButton1Clicked()

{

	AfxMessageBox("VC知识库欢迎您! ");

}

2.5.3 消息映射

BEGIN_MESSAGE_MAP(CMainFrame, CFrameWnd)

	//{{AFX_MSG_MAP(CMainFrame)

		ON_BN_CLICKED(ID_BUTTON1, OnNcButton1Clicked)

		ON_BN_CLICKED(ID_BUTTON2, OnNcButton2Clicked)

		ON_BN_CLICKED(ID_BUTTON3, OnNcButton3Clicked)

	ON_WM_CREATE()

	//}}AFX_MSG_MAP

END_MESSAGE_MAP()

总结：本文提供的两个类可以方便地往非客户区（如：标题栏）添加按钮，欢迎批评指正！ 下载本文示例代码

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