轻松实现非客户区按钮

下载源代码

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! www.vckbase.com");
}

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！