www.gusucode.com > 浅谈在应用CRectTracker类的程序中响应WM_LBUTTONUP消息 > 浅谈在应用CRectTracker类的程序中响应WM_LBUTTONUP消息/crecttracker_demo/CRectTracker_Demo/CRectTracker_DemoDlg.cpp

    // CRectTracker_DemoDlg.cpp : implementation file
//

#include "stdafx.h"
#include "CRectTracker_Demo.h"
#include "CRectTracker_DemoDlg.h"

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

///////////////////////
CRect rect;
BOOL IsLButtonDown=FALSE;//鼠标左键是否按下
CPoint pt_start;//橡皮筋区域的启始点（鼠标左键按下时）
CPoint pt_end;//橡皮筋区域的终止点（鼠标左键松开时）
///////////////////////

/////////////////////////////////////////////////////////////////////////////
// CAboutDlg dialog used for App About

class CAboutDlg : public CDialog
{
public:
	CAboutDlg();

// Dialog Data
	//{{AFX_DATA(CAboutDlg)
	enum { IDD = IDD_ABOUTBOX };
	//}}AFX_DATA

	// ClassWizard generated virtual function overrides
	//{{AFX_VIRTUAL(CAboutDlg)
	protected:
	virtual void DoDataExchange(CDataExchange* pDX);    // DDX/DDV support
	//}}AFX_VIRTUAL

// Implementation
protected:
	//{{AFX_MSG(CAboutDlg)
	//}}AFX_MSG
	DECLARE_MESSAGE_MAP()
};

CAboutDlg::CAboutDlg() : CDialog(CAboutDlg::IDD)
{
	//{{AFX_DATA_INIT(CAboutDlg)
	//}}AFX_DATA_INIT
}

void CAboutDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CAboutDlg)
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CAboutDlg, CDialog)
	//{{AFX_MSG_MAP(CAboutDlg)
		// No message handlers
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CCRectTracker_DemoDlg dialog

CCRectTracker_DemoDlg::CCRectTracker_DemoDlg(CWnd* pParent /*=NULL*/)
	: CDialog(CCRectTracker_DemoDlg::IDD, pParent)
{
	//{{AFX_DATA_INIT(CCRectTracker_DemoDlg)
		// NOTE: the ClassWizard will add member initialization here
	//}}AFX_DATA_INIT
	// Note that LoadIcon does not require a subsequent DestroyIcon in Win32
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
}

void CCRectTracker_DemoDlg::DoDataExchange(CDataExchange* pDX)
{
	CDialog::DoDataExchange(pDX);
	//{{AFX_DATA_MAP(CCRectTracker_DemoDlg)
		// NOTE: the ClassWizard will add DDX and DDV calls here
	//}}AFX_DATA_MAP
}

BEGIN_MESSAGE_MAP(CCRectTracker_DemoDlg, CDialog)
	//{{AFX_MSG_MAP(CCRectTracker_DemoDlg)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_WM_SETCURSOR()
	ON_WM_LBUTTONDOWN()
	ON_WM_LBUTTONUP()
	ON_WM_LBUTTONDBLCLK()
	ON_BN_CLICKED(IDC_ABOUT, OnAbout)
	//}}AFX_MSG_MAP
END_MESSAGE_MAP()

/////////////////////////////////////////////////////////////////////////////
// CCRectTracker_DemoDlg message handlers

BOOL CCRectTracker_DemoDlg::OnInitDialog()
{
	CDialog::OnInitDialog();

	// Add "About..." menu item to system menu.

	// IDM_ABOUTBOX must be in the system command range.
	ASSERT((IDM_ABOUTBOX & 0xFFF0) == IDM_ABOUTBOX);
	ASSERT(IDM_ABOUTBOX < 0xF000);

	CMenu* pSysMenu = GetSystemMenu(FALSE);
	if (pSysMenu != NULL)
	{
		CString strAboutMenu;
		strAboutMenu.LoadString(IDS_ABOUTBOX);
		if (!strAboutMenu.IsEmpty())
		{
			pSysMenu->AppendMenu(MF_SEPARATOR);
			pSysMenu->AppendMenu(MF_STRING, IDM_ABOUTBOX, strAboutMenu);
		}
	}

	// Set the icon for this dialog.  The framework does this automatically
	//  when the application's main window is not a dialog
	SetIcon(m_hIcon, TRUE);			// Set big icon
	SetIcon(m_hIcon, FALSE);		// Set small icon
	
	// TODO: Add extra initialization here
	//////////////////////////////////////
	//初始化
	m_rectTracker.m_nStyle=CRectTracker::resizeOutside|CRectTracker::dottedLine;
	m_rectTracker.m_rect.SetRect(0,0,0,0);
	//////////////////////////////////////
	
	return TRUE;  // return TRUE  unless you set the focus to a control
}

void CCRectTracker_DemoDlg::OnSysCommand(UINT nID, LPARAM lParam)
{
	if ((nID & 0xFFF0) == IDM_ABOUTBOX)
	{
		CAboutDlg dlgAbout;
		dlgAbout.DoModal();
	}
	else
	{
		CDialog::OnSysCommand(nID, lParam);
	}
}

// If you add a minimize button to your dialog, you will need the code below
//  to draw the icon.  For MFC applications using the document/view model,
//  this is automatically done for you by the framework.

void CCRectTracker_DemoDlg::OnPaint() 
{
	if (IsIconic())
	{
		CPaintDC dc(this); // device context for painting

		SendMessage(WM_ICONERASEBKGND, (WPARAM) dc.GetSafeHdc(), 0);

		// Center icon in client rectangle
		int cxIcon = GetSystemMetrics(SM_CXICON);
		int cyIcon = GetSystemMetrics(SM_CYICON);
		CRect rect;
		GetClientRect(&rect);
		int x = (rect.Width() - cxIcon + 1) / 2;
		int y = (rect.Height() - cyIcon + 1) / 2;

		// Draw the icon
		dc.DrawIcon(x, y, m_hIcon);
	}
	else
	{
		////////画出橡皮筋/////////
		CDC* pDC;
		pDC=GetDC();
		m_rectTracker.Draw(pDC);
		pDC->DeleteDC();
		///////////////////////

		CDialog::OnPaint();
	}
}

// The system calls this to obtain the cursor to display while the user drags
//  the minimized window.
HCURSOR CCRectTracker_DemoDlg::OnQueryDragIcon()
{
	return (HCURSOR) m_hIcon;
}

BOOL CCRectTracker_DemoDlg::OnSetCursor(CWnd* pWnd, UINT nHitTest, UINT message) 
{
	// TODO: Add your message handler code here and/or call default

	//////////////////////
	//改变光标的形状
	if (pWnd == this && m_rectTracker.SetCursor(this, nHitTest))
		return TRUE;
	//////////////////////
	else
		return CDialog::OnSetCursor(pWnd, nHitTest, message);
}

void CCRectTracker_DemoDlg::OnLButtonDown(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default

	///////////////////////////////////////
	//如鼠标点击位置不在选框区域内，则构造一个新选框
	Invalidate(TRUE);
	if(m_rectTracker.HitTest(point)<0)
	{
		IsLButtonDown=TRUE;
		CRectTracker temp;
		temp.TrackRubberBand(this,point,TRUE);
		temp.m_rect.NormalizeRect();
		
		//鼠标（矩形选框）起始位置
		pt_start=point;
		//鼠标（矩形选框）结束位置
		GetCursorPos(&pt_end);
		this->SendMessage(WM_LBUTTONUP,NULL,NULL);
	}
	//否则重置选框大小或位置
	else
	{
		m_rectTracker.Track(this,point,TRUE);
		m_rectTracker.m_rect.NormalizeRect();
		this->OnPaint();
	}
	///////////////////////////////////////
	
	CDialog::OnLButtonDown(nFlags, point);
}

void CCRectTracker_DemoDlg::OnLButtonUp(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default

	/////////////////////////////////
	//确保在构造一个新选框时才响应OnLButtonUp，否则在响应OnLButtonDblClk时会出现错误结果
	if(IsLButtonDown==TRUE)
	{
		//MessageBox("鼠标左键松开","松开",NULL);
		
		//由于GetCursorPos获得的pt_end是Screen坐标，故用ScreenToClient()进行转换
		rect.right=pt_end.x;
		rect.bottom=pt_end.y;
		ScreenToClient(&rect);
		pt_end.x=rect.right;
		pt_end.y=rect.bottom;
		
		//left,top,right,bottom
		m_rectTracker.m_rect.SetRect(pt_start.x,pt_start.y,pt_end.x,pt_end.y);
		m_rectTracker.m_rect.NormalizeRect();
		
		this->OnPaint();
		IsLButtonDown=FALSE;
	}
	/////////////////////////////////
	
	CDialog::OnLButtonUp(nFlags, point);
}

void CCRectTracker_DemoDlg::OnLButtonDblClk(UINT nFlags, CPoint point) 
{
	// TODO: Add your message handler code here and/or call default

	////////////////////////////
	MessageBox("鼠标左键双击","双击",NULL);
	////////////////////////////
	
	CDialog::OnLButtonDblClk(nFlags, point);
}

void CCRectTracker_DemoDlg::OnAbout() 
{
	// TODO: Add your control notification handler code here

	//////////////////////////////////////
	CAboutDlg dlgAbout;
	dlgAbout.DoModal();
	//////////////////////////////////////
}