projects / wxWidgets.git / blame
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1 | \section{\class{wxScreenDC}}\label{wxscreendc} |
| 2 | ||
| 3 | A wxScreenDC can be used to paint on the screen. | |
| 4 | This should normally be constructed as a temporary stack object; don't store | |
| 5 | a wxScreenDC object. | |
| 6 | ||
| 7 | \wxheading{Derived from} | |
| 8 | ||
| 9 | \helpref{wxDC}{wxdc} | |
| 10 | ||
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11 | \wxheading{Include files} |
| 12 | ||
| 13 | <wx/dcscreen.h> | |
| 14 | ||
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15 | \wxheading{See also} |
| 16 | ||
| 17 | \helpref{wxDC}{wxdc}, \helpref{wxMemoryDC}{wxmemorydc}, \helpref{wxPaintDC}{wxpaintdc},\rtfsp | |
| 18 | \helpref{wxClientDC}{wxclientdc}, \helpref{wxWindowDC}{wxwindowdc} | |
| 19 | ||
| 20 | \latexignore{\rtfignore{\wxheading{Members}}} | |
| 21 | ||
| 22 | \membersection{wxScreenDC::wxScreenDC} | |
| 23 | ||
| 24 | \func{}{wxScreenDC}{\void} | |
| 25 | ||
| 26 | Constructor. | |
| 27 | ||
| 28 | \membersection{wxScreenDC::StartDrawingOnTop}\label{wxscreendcstartdrawingontop} | |
| 29 | ||
| 30 | \func{bool}{StartDrawingOnTop}{\param{wxWindow*}{ window}} | |
| 31 | ||
| 32 | \func{bool}{StartDrawingOnTop}{\param{wxRect*}{ rect = NULL}} | |
| 33 | ||
| 34 | Use this in conjunction with \helpref{EndDrawingOnTop}{wxscreendcenddrawingontop} to | |
| 35 | ensure that drawing to the screen occurs on top of existing windows. Without this, | |
| 36 | some window systems (such as X) only allow drawing to take place underneath | |
| 37 | other windows. | |
| 38 | ||
| 39 | By using the first form of this function, an application is specifying that | |
| 40 | the area that will be drawn on coincides with the given window. | |
| 41 | ||
| 42 | By using the second form, an application can specify an area of the screen | |
| 43 | which is to be drawn on. If NULL is passed, the whole screen is available. | |
| 44 | ||
| 45 | It is recommended that an area of the screen is specified because with large regions, | |
| 46 | flickering effects are noticeable when destroying the temporary transparent window used | |
| 47 | to implement this feature. | |
| 48 | ||
| 49 | You might use this pair of functions when implementing a drag feature, for example | |
| 50 | as in the \helpref{wxSplitterWindow}{wxsplitterwindow} implementation. | |
| 51 | ||
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52 | \wxheading{Remarks} |
| 53 | ||
| 54 | This function is probably obsolete since the X implementations | |
| 55 | allow drawing directly on the screen now. However, the fact that this | |
| 56 | function allows the screen to be refreshed afterwards, may be useful to | |
| 57 | some applications. | |
| 58 | ||
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59 | \membersection{wxScreenDC::EndDrawingOnTop}\label{wxscreendcenddrawingontop} |
| 60 | ||
| 61 | \func{bool}{EndDrawingOnTop}{\void} | |
| 62 | ||
| 63 | Use this in conjunction with \helpref{StartDrawingOnTop}{wxscreendcstartdrawingontop}. | |
| 64 | ||
| 65 | This function destroys the temporary window created to implement on-top drawing (X only). | |
| 66 |