VisualStudio2022 MFC 靠窗悬浮功能代码实现及效果演示

目录

• • 效果如下
  • 头文件
  • CPP文件
  • • 2.1 宏定义
    • 2.2 构造函数
    • 2.3 消息响应
    • 2.4 代码实现

工具：VS2022
框架：MFC
语言：C++
类型：Dialog 单对话框
假设窗体类为：CBLToolsDlg

---

效果如下

先展示下效果,否则光凭着嘴上的描述无法形象展示.

头文件

//靠窗隐藏
protected:
	//修正移动时窗口的大小
	void FixMoving(UINT fwSide, LPRECT pRect);
	//修正改改变窗口大小时窗口的大小
	void FixSizing(UINT fwSide, LPRECT pRect);
	//从收缩状态显示窗口
	void DoShow();
	//从显示状态收缩窗口
	void DoHide();
	//重载函数,只是为了方便调用
	BOOL SetWindowPos(const CWnd* pWndInsertAfter,
		LPCRECT pCRect, UINT nFlags = SWP_SHOWWINDOW);
private:
	BOOL m_isSizeChanged;   //窗口大小是否改变了 
	BOOL m_isSetTimer;      //是否设置了检测鼠标的Timer

	INT  m_oldWndHeight;    //旧的窗口宽度
	INT  m_taskBarHeight;   //任务栏高度
	INT  m_edgeHeight;      //边缘高度
	INT  m_edgeWidth;       //边缘宽度

	INT  m_hideMode;        //隐藏模式
	BOOL m_hsFinished;      //隐藏或显示过程是否完成
	BOOL m_hiding;          //该参数只有在!m_hsFinished才有效
	//真:正在隐藏,假:正在显示
	
public:
	afx_msg LRESULT OnNcHitTest(CPoint point);
	afx_msg void OnMoving(UINT fwSide, LPRECT pRect);
	afx_msg int  OnCreate(LPCREATESTRUCT lpCreateStruct);
	afx_msg void OnSizing(UINT fwSide, LPRECT pRect);
	afx_msg void OnTimer(UINT_PTR nIDEvent);

CPP文件 2.1 宏定义

//HIDE功能 收缩模式
#define HM_NONE     0   //不收缩
#define HM_TOP      1   //向上收缩
#define HM_BOTTOM   2   //向下收缩
#define HM_LEFT     3   //向左收缩
#define HM_RIGHT    4   //向右收缩
#define CM_ELAPSE   200 //检测鼠标是否离开窗口的时间间隔
#define HS_ELAPSE   5   //隐藏或显示过程每步的时间间隔
#define HS_STEPS    10  //隐藏或显示过程分成多少步
#define INTERVAL    20  //触发粘附时鼠标与屏幕边界的最小间隔,单位为象素
#define INFALTE     10  //触发收缩时鼠标与窗口边界的最小间隔,单位为象素
#define MINCX       200 //窗口最小宽度
#define MINCY       400 //窗口最小高度

2.2 构造函数

CBLToolsDlg::CBLToolsDlg(CWnd* pParent )
	: CDialogEx(IDD_BLTOOLS_DIALOG, pParent)
{
	m_hIcon = AfxGetApp()->LoadIcon(IDR_MAINFRAME);
//HIDE功能
//构造函数初始化成员变量
	m_isSizeChanged = FALSE;
	m_isSetTimer = FALSE;
	m_hsFinished = TRUE;
	m_hiding = FALSE;

	m_oldWndHeight = MINCY;
	m_taskBarHeight = 30;
	m_edgeHeight = 0;
	m_edgeWidth = 0;
	m_hideMode = HM_NONE;
}

2.3 消息响应

BEGIN_MESSAGE_MAP(CBLToolsDlg, CDialogEx)
	ON_WM_SYSCOMMAND()
	ON_WM_PAINT()
	ON_WM_QUERYDRAGICON()
	ON_WM_NCHITTEST()			//[Damogu][BEGIN]隐藏
	ON_WM_MOVING()
	ON_WM_CREATE()
	ON_WM_SIZING()				
	ON_WM_TIMER()				//[Damogu][END]
END_MESSAGE_MAP()

2.4 代码实现

LRESULT CBLToolsDlg::OnNcHitTest(CPoint point)
{
	// TODO:  在此添加消息处理程序代码和/或调用默认值
	CString str;
	str.Format(_T("Mouse (%d,%d)"), point.x, point.y);
	//GetDlgItem(IDC_CURSOR)->SetWindowText(str);
	if (m_hideMode != HM_NONE && !m_isSetTimer &&
		//防止鼠标超出屏幕右边时向右边收缩造成闪烁
		point.x < GetSystemMetrics(SM_CXSCREEN) + INFALTE)
	{   //鼠标进入时,如果是从收缩状态到显示状态则开启Timer
		SetTimer(4, CM_ELAPSE, NULL);
		m_isSetTimer = TRUE;

		m_hsFinished = FALSE;
		m_hiding = FALSE;
		SetTimer(5, HS_ELAPSE, NULL); //开启显示过程
	}
	return CDialogEx::OnNcHitTest(point);
}

void CBLToolsDlg::OnMoving(UINT fwSide, LPRECT pRect)
{
	FixMoving(fwSide, pRect); //修正pRect
	CDialogEx::OnMoving(fwSide, pRect);
}

int CBLToolsDlg::OnCreate(LPCREATESTRUCT lpCreateStruct)
{
	if (CDialogEx::OnCreate(lpCreateStruct) == -1)
		return -1;
	// TODO:在此添加您专用的创建代码
	//获得任务栏高度
	CWnd* p;
	p = this->FindWindow(_T("Shell_TrayWnd"), NULL);
	if (p != NULL)
	{
		CRect tRect;
		p->GetWindowRect(tRect);
		m_taskBarHeight = tRect.Height();
	}

	//修改风格使得他不在任务栏显示
	ModifyStyleEx(WS_EX_APPWINDOW, WS_EX_TOOLWINDOW);
	//去掉关闭按键(如果想画3个按键的话)
	//ModifyStyle(WS_SYSMENU,NULL);

	//获得边缘高度和宽度
	m_edgeHeight = GetSystemMetrics(SM_CYEDGE);
	m_edgeWidth = GetSystemMetrics(SM_CXFRAME);

	//可以在这里读取上次关闭后保存的大小

	return 0;
}

void CBLToolsDlg::OnSizing(UINT fwSide, LPRECT pRect)
{
	FixSizing(fwSide, pRect); //修正pRect
	CDialogEx::OnSizing(fwSide, pRect);
}

void CBLToolsDlg::FixMoving(UINT fwSide, LPRECT pRect)
{
	POINT curPos;
	GetCursorPos(&curPos);
	INT screenHeight = GetSystemMetrics(SM_CYSCREEN);
	INT screenWidth = GetSystemMetrics(SM_CXSCREEN);
	INT height = pRect->bottom - pRect->top;
	INT width = pRect->right - pRect->left;

	if (curPos.y <= INTERVAL)
	{ //粘附在上边
		pRect->bottom = height - m_edgeHeight;
		pRect->top = -m_edgeHeight;
		m_hideMode = HM_TOP;
	}
	else if (curPos.y >= (screenHeight - INTERVAL - m_taskBarHeight))
	{ //粘附在下边
		pRect->top = screenHeight - m_taskBarHeight - height;
		pRect->bottom = screenHeight - m_taskBarHeight;
		m_hideMode = HM_BOTTOM;
	}
	else if (curPos.x < INTERVAL)
	{ //粘附在左边
		if (!m_isSizeChanged)
		{
			CRect tRect;
			GetWindowRect(tRect);
			m_oldWndHeight = tRect.Height();
		}
		pRect->right = width;
		pRect->left = 0;
		pRect->top = -m_edgeHeight;
		pRect->bottom = screenHeight - m_taskBarHeight;
		m_isSizeChanged = TRUE;
		m_hideMode = HM_LEFT;
	}
	else if (curPos.x >= (screenWidth - INTERVAL))
	{ //粘附在右边
		if (!m_isSizeChanged)
		{
			CRect tRect;
			GetWindowRect(tRect);
			m_oldWndHeight = tRect.Height();
		}
		pRect->left = screenWidth - width;
		pRect->right = screenWidth;
		pRect->top = -m_edgeHeight;
		pRect->bottom = screenHeight - m_taskBarHeight;
		m_isSizeChanged = TRUE;
		m_hideMode = HM_RIGHT;
	}
	else
	{ //不粘附
		if (m_isSizeChanged)
		{ //如果收缩到两边,则拖出来后会变回原来大小
			//在"拖动不显示窗口内容下"只有光栅变回原来大小
			pRect->bottom = pRect->top + m_oldWndHeight;
			m_isSizeChanged = FALSE;
		}
		if (m_isSetTimer)
		{ //如果Timer开启了,则关闭之
			if (KillTimer(4) == 1)
				m_isSetTimer = FALSE;
		}
		m_hideMode = HM_NONE;
		//GetDlgItem(IDC_TIMER)->SetWindowText(_T("Timer off"));
	}
}
void CBLToolsDlg::DoHide()
{
	if (m_hideMode == HM_NONE)
		return;
	CRect tRect;
	GetWindowRect(tRect);
	INT height = tRect.Height();
	INT width = tRect.Width();
	INT steps = 0;
	switch (m_hideMode)
	{
	case HM_TOP:
		steps = height / HS_STEPS;
		tRect.bottom -= steps;
		if (tRect.bottom <= m_edgeWidth)
		{ //你可以把下面一句替换上面的 ...+=|-=steps 达到取消抽屉效果
			//更好的办法是添加个BOOL值来控制,其他case同样.
			tRect.bottom = m_edgeWidth;
			m_hsFinished = TRUE; //完成隐藏过程
		}
		tRect.top = tRect.bottom - height;
		break;
	case HM_BOTTOM:
		steps = height / HS_STEPS;
		tRect.top += steps;
		if (tRect.top >= (GetSystemMetrics(SM_CYSCREEN) - m_edgeWidth))
		{
			tRect.top = GetSystemMetrics(SM_CYSCREEN) - m_edgeWidth;
			m_hsFinished = TRUE;
		}
		tRect.bottom = tRect.top + height;
		break;
	case HM_LEFT:
		steps = width / HS_STEPS;
		tRect.right -= steps;
		if (tRect.right <= m_edgeWidth)
		{
			tRect.right = m_edgeWidth;
			m_hsFinished = TRUE;
		}
		tRect.left = tRect.right - width;
		tRect.top = -m_edgeHeight;
		tRect.bottom = GetSystemMetrics(SM_CYSCREEN) - m_taskBarHeight;
		break;
	case HM_RIGHT:
		steps = width / HS_STEPS;
		tRect.left += steps;
		if (tRect.left >= (GetSystemMetrics(SM_CXSCREEN) - m_edgeWidth))
		{
			tRect.left = GetSystemMetrics(SM_CXSCREEN) - m_edgeWidth;
			m_hsFinished = TRUE;
		}
		tRect.right = tRect.left + width;
		tRect.top = -m_edgeHeight;
		tRect.bottom = GetSystemMetrics(SM_CYSCREEN) - m_taskBarHeight;
		break;
	default:
		break;
	}
	SetWindowPos(&wndTopMost, tRect);
}

void CBLToolsDlg::DoShow()
{
	if (m_hideMode == HM_NONE)
		return;

	CRect tRect;
	GetWindowRect(tRect);
	INT height = tRect.Height();
	INT width = tRect.Width();

	INT steps = 0;

	switch (m_hideMode)
	{
	case HM_TOP:
		steps = height / HS_STEPS;
		tRect.top += steps;
		if (tRect.top >= -m_edgeHeight)
		{ //你可以把下面一句替换上面的 ...+=|-=steps 达到取消抽屉效果
			//更好的办法是添加个BOOL值来控制,其他case同样.
			tRect.top = -m_edgeHeight;
			m_hsFinished = TRUE; //完成显示过程
		}
		tRect.bottom = tRect.top + height;
		break;
	case HM_BOTTOM:
		steps = height / HS_STEPS;
		tRect.top -= steps;
		if (tRect.top <= (GetSystemMetrics(SM_CYSCREEN) - height))
		{
			tRect.top = GetSystemMetrics(SM_CYSCREEN) - height;
			m_hsFinished = TRUE;
		}
		tRect.bottom = tRect.top + height;
		break;
	case HM_LEFT:
		steps = width / HS_STEPS;
		tRect.right += steps;
		if (tRect.right >= width)
		{
			tRect.right = width;
			m_hsFinished = TRUE;
		}
		tRect.left = tRect.right - width;
		tRect.top = -m_edgeHeight;
		tRect.bottom = GetSystemMetrics(SM_CYSCREEN) - m_taskBarHeight;
		break;
	case HM_RIGHT:
		steps = width / HS_STEPS;
		tRect.left -= steps;
		if (tRect.left <= (GetSystemMetrics(SM_CXSCREEN) - width))
		{
			tRect.left = GetSystemMetrics(SM_CXSCREEN) - width;
			m_hsFinished = TRUE;
		}
		tRect.right = tRect.left + width;
		tRect.top = -m_edgeHeight;
		tRect.bottom = GetSystemMetrics(SM_CYSCREEN) - m_taskBarHeight;
		break;
	default:
		break;
	}

	SetWindowPos(&wndTopMost, tRect);
}

//接着SetWindowPos和FixSizing函数
BOOL CBLToolsDlg::SetWindowPos(const CWnd* pWndInsertAfter, LPCRECT pCRect, UINT nFlags)
{
	return CDialog::SetWindowPos(pWndInsertAfter, pCRect->left, pCRect->top,
		pCRect->right - pCRect->left, pCRect->bottom - pCRect->top, nFlags);
}



void CBLToolsDlg::FixSizing(UINT fwSide, LPRECT pRect)
{
	CRect curRect(pRect);

	if (curRect.Width() < MINCX || curRect.Height() < MINCY)
	{   //小于指定的最小宽度或高度
		switch (fwSide)
		{
		case WMSZ_BOTTOM:
			pRect->bottom = pRect->top + MINCY;
			break;
		case WMSZ_BOTTOMLEFT:
			if (curRect.Width() <= MINCX)
				pRect->left = pRect->right - MINCX;
			if (curRect.Height() <= MINCY)
				pRect->bottom = pRect->top + MINCY;
			break;
		case WMSZ_BOTTOMRIGHT:
			if (curRect.Width() < MINCX)
				pRect->right = pRect->left + MINCX;
			if (curRect.Height() < MINCY)
				pRect->bottom = pRect->top + MINCY;
			break;
		case WMSZ_LEFT:
			pRect->left = pRect->right - MINCX;
			break;
		case WMSZ_RIGHT:
			pRect->right = pRect->left + MINCX;
			break;
		case WMSZ_TOP:
			pRect->top = pRect->bottom - MINCY;
			break;
		case WMSZ_TOPLEFT:
			if (curRect.Width() <= MINCX)
				pRect->left = pRect->right - MINCX;
			if (curRect.Height() <= MINCY)
				pRect->top = pRect->bottom - MINCY;
			break;
		case WMSZ_TOPRIGHT:
			if (curRect.Width() < MINCX)
				pRect->right = pRect->left + MINCX;
			if (curRect.Height() < MINCY)
				pRect->top = pRect->bottom - MINCY;
			break;
		}
	}
}

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