added null pointer check and assert

[wxWidgets.git] / docs / latex / wx / windowdc.tex

\section{\class{wxWindowDC}}\label{wxwindowdc}

A wxWindowDC must be constructed if an application wishes to paint on the
whole area of a window (client and decorations).
This should normally be constructed as a temporary stack object; don't store
a wxWindowDC object.

To draw on a window from inside {\bf OnPaint}, construct a \helpref{wxPaintDC}{wxpaintdc} object.

To draw on the client area of a window from outside {\bf OnPaint}, construct a \helpref{wxClientDC}{wxclientdc} object.

To draw on the whole window including decorations, construct a \helpref{wxWindowDC}{wxwindowdc} object
(Windows only).

\wxheading{Derived from}

\helpref{wxDC}{wxdc}\\
\helpref{wxObject}{wxobject}

\wxheading{Include files}

<wx/dcclient.h>

\wxheading{Library}

\helpref{wxCore}{librarieslist}

\wxheading{See also}

\helpref{wxDC}{wxdc}, \helpref{wxMemoryDC}{wxmemorydc}, \helpref{wxPaintDC}{wxpaintdc},\rtfsp
\helpref{wxClientDC}{wxclientdc}, \helpref{wxScreenDC}{wxscreendc}

\latexignore{\rtfignore{\wxheading{Members}}}

\membersection{wxWindowDC::wxWindowDC}\label{wxwindowdcwxwindowdc}

\func{}{wxWindowDC}{\param{wxWindow*}{ window}}

Constructor. Pass a pointer to the window on which you wish to paint.