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Add default ctor to wxMSW private WindowHDC helper class.

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Allow to use objects of this class without any valid HWND, this is useful for
the derived classes which may, or may not, need the corresponding HDC.

See #14194.

git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@71208 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
This commit is contained in:
Vadim Zeitlin 2012-04-16 14:29:59 +00:00
parent 45cecdf943
commit badf8578b2
1 changed files with 2 additions and 1 deletions
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3
include/wx/msw/private.h
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@ -417,8 +417,9 @@ private:
class WindowHDC
{
public:
WindowHDC() : m_hwnd(NULL), m_hdc(NULL) { }
WindowHDC(HWND hwnd) { m_hdc = ::GetDC(m_hwnd = hwnd); }
~WindowHDC() { ::ReleaseDC(m_hwnd, m_hdc); }
~WindowHDC() { if ( m_hwnd && m_hdc ) { ::ReleaseDC(m_hwnd, m_hdc); } }
operator HDC() const { return m_hdc; }