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窗体透明鼠标穿透标签控件不透明

2018-09-25
朱皮特
   
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定义一个掩码颜色:

const COLORREF maskColor = RGB(0, 0, 0);	// 透明颜色
const COLORREF textColor = RGB(0, 255, 0);	// 标签文本颜色

设置窗体的Topmost为True,测试发现在OnInitDialog中修改无效,在资源中修改的可以生效。

窗口初始化中添加(例如OnInitDialog中):

// 鼠标穿透要带WS_EX_TRANSPARENT,并且要设置窗口置顶
LONG lWindLong = GetWindowLong(this->GetSafeHwnd(), GWL_EXSTYLE);
::SetWindowLong(m_hWnd, GWL_EXSTYLE, lWindLong | WS_EX_TRANSPARENT | WS_EX_LAYERED | WS_EX_TOPMOST);
SetLayeredWindowAttributes(maskColor, 0, LWA_COLORKEY);

//::SetWindowPos(m_hWnd, HWND_TOPMOST, 0, 0, 0, 0, SWP_NOMOVE | SWP_NOSIZE);

添加消息映射:

ON_WM_CTLCOLOR()
ON_WM_ERASEBKGND()

HBRUSH CglassDlg::OnCtlColor(CDC* pDC, CWnd* pWnd, UINT nCtlColor) {
	HBRUSH hBrush = __super::OnCtlColor(pDC, pWnd, nCtlColor);
	
	switch(pWnd->GetDlgCtrlID()) {
		case IDC_STATIC:
			pDC->SetBkMode(TRANSPARENT);
			pDC->SetTextColor(textColor);
			return (HBRUSH)GetStockObject(HOLLOW_BRUSH);
		default:
				break; 
	}

	return hBrush;
}

BOOL CglassDlg::OnEraseBkgnd(CDC *pDC) {
	CRect clientRect ;

	GetClientRect(&clientRect) ;
	pDC->FillSolidRect(clientRect, maskColor);

	return FALSE  ;
}

参考:


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