fa482912e4
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@6718 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
67 lines
2.2 KiB
TeX
67 lines
2.2 KiB
TeX
\section{\class{wxScreenDC}}\label{wxscreendc}
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A wxScreenDC can be used to paint on the screen.
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This should normally be constructed as a temporary stack object; don't store
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a wxScreenDC object.
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\wxheading{Derived from}
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\helpref{wxDC}{wxdc}
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\wxheading{Include files}
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<wx/dcscreen.h>
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\wxheading{See also}
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\helpref{wxDC}{wxdc}, \helpref{wxMemoryDC}{wxmemorydc}, \helpref{wxPaintDC}{wxpaintdc},\rtfsp
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\helpref{wxClientDC}{wxclientdc}, \helpref{wxWindowDC}{wxwindowdc}
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\latexignore{\rtfignore{\wxheading{Members}}}
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\membersection{wxScreenDC::wxScreenDC}
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\func{}{wxScreenDC}{\void}
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Constructor.
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\membersection{wxScreenDC::StartDrawingOnTop}\label{wxscreendcstartdrawingontop}
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\func{bool}{StartDrawingOnTop}{\param{wxWindow*}{ window}}
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\func{bool}{StartDrawingOnTop}{\param{wxRect*}{ rect = NULL}}
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Use this in conjunction with \helpref{EndDrawingOnTop}{wxscreendcenddrawingontop} to
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ensure that drawing to the screen occurs on top of existing windows. Without this,
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some window systems (such as X) only allow drawing to take place underneath
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other windows.
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By using the first form of this function, an application is specifying that
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the area that will be drawn on coincides with the given window.
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By using the second form, an application can specify an area of the screen
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which is to be drawn on. If NULL is passed, the whole screen is available.
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It is recommended that an area of the screen is specified because with large regions,
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flickering effects are noticeable when destroying the temporary transparent window used
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to implement this feature.
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You might use this pair of functions when implementing a drag feature, for example
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as in the \helpref{wxSplitterWindow}{wxsplitterwindow} implementation.
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\wxheading{Remarks}
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This function is probably obsolete since the X implementations
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allow drawing directly on the screen now. However, the fact that this
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function allows the screen to be refreshed afterwards, may be useful to
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some applications.
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\membersection{wxScreenDC::EndDrawingOnTop}\label{wxscreendcenddrawingontop}
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\func{bool}{EndDrawingOnTop}{\void}
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Use this in conjunction with \helpref{StartDrawingOnTop}{wxscreendcstartdrawingontop}.
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This function destroys the temporary window created to implement on-top drawing (X only).
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