| 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 | \helpref{wxObject}{wxobject} |
| 11 | |
| 12 | \wxheading{Include files} |
| 13 | |
| 14 | <wx/dcscreen.h> |
| 15 | |
| 16 | \wxheading{Library} |
| 17 | |
| 18 | \helpref{wxCore}{librarieslist} |
| 19 | |
| 20 | \wxheading{See also} |
| 21 | |
| 22 | \helpref{wxDC}{wxdc}, \helpref{wxMemoryDC}{wxmemorydc}, \helpref{wxPaintDC}{wxpaintdc},\rtfsp |
| 23 | \helpref{wxClientDC}{wxclientdc}, \helpref{wxWindowDC}{wxwindowdc} |
| 24 | |
| 25 | \latexignore{\rtfignore{\wxheading{Members}}} |
| 26 | |
| 27 | \membersection{wxScreenDC::wxScreenDC}\label{wxscreendcctor} |
| 28 | |
| 29 | \func{}{wxScreenDC}{\void} |
| 30 | |
| 31 | Constructor. |
| 32 | |
| 33 | \membersection{wxScreenDC::StartDrawingOnTop}\label{wxscreendcstartdrawingontop} |
| 34 | |
| 35 | \func{bool}{StartDrawingOnTop}{\param{wxWindow*}{ window}} |
| 36 | |
| 37 | \func{bool}{StartDrawingOnTop}{\param{wxRect*}{ rect = NULL}} |
| 38 | |
| 39 | Use this in conjunction with \helpref{EndDrawingOnTop}{wxscreendcenddrawingontop} to |
| 40 | ensure that drawing to the screen occurs on top of existing windows. Without this, |
| 41 | some window systems (such as X) only allow drawing to take place underneath |
| 42 | other windows. |
| 43 | |
| 44 | By using the first form of this function, an application is specifying that |
| 45 | the area that will be drawn on coincides with the given window. |
| 46 | |
| 47 | By using the second form, an application can specify an area of the screen |
| 48 | which is to be drawn on. If NULL is passed, the whole screen is available. |
| 49 | |
| 50 | It is recommended that an area of the screen is specified because with large regions, |
| 51 | flickering effects are noticeable when destroying the temporary transparent window used |
| 52 | to implement this feature. |
| 53 | |
| 54 | You might use this pair of functions when implementing a drag feature, for example |
| 55 | as in the \helpref{wxSplitterWindow}{wxsplitterwindow} implementation. |
| 56 | |
| 57 | \wxheading{Remarks} |
| 58 | |
| 59 | This function is probably obsolete since the X implementations |
| 60 | allow drawing directly on the screen now. However, the fact that this |
| 61 | function allows the screen to be refreshed afterwards, may be useful to |
| 62 | some applications. |
| 63 | |
| 64 | \membersection{wxScreenDC::EndDrawingOnTop}\label{wxscreendcenddrawingontop} |
| 65 | |
| 66 | \func{bool}{EndDrawingOnTop}{\void} |
| 67 | |
| 68 | Use this in conjunction with \helpref{StartDrawingOnTop}{wxscreendcstartdrawingontop}. |
| 69 | |
| 70 | This function destroys the temporary window created to implement on-top drawing (X only). |
| 71 | |