86 lines
3.4 KiB
Objective-C
86 lines
3.4 KiB
Objective-C
/////////////////////////////////////////////////////////////////////////////
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// Name: dcscreen.h
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// Purpose: interface of wxScreenDC
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// Author: wxWidgets team
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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/**
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@class wxScreenDC
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A wxScreenDC can be used to paint on the screen. This should normally be
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constructed as a temporary stack object; don't store a wxScreenDC object.
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When using multiple monitors, wxScreenDC corresponds to the entire virtual
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screen composed of all of them. Notice that coordinates on wxScreenDC can
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be negative in this case, see wxDisplay::GetGeometry() for more.
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@library{wxcore}
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@category{dc}
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@see wxDC, wxMemoryDC, wxPaintDC, wxClientDC, wxWindowDC
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*/
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class wxScreenDC : public wxDC
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{
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public:
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/**
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Constructor.
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*/
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wxScreenDC();
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/**
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Use this in conjunction with StartDrawingOnTop().
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This function destroys the temporary window created to implement on-top
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drawing (X only).
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*/
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static bool EndDrawingOnTop();
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/**
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Use this in conjunction with EndDrawingOnTop() to ensure that drawing
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to the screen occurs on top of existing windows. Without this, some
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window systems (such as X) only allow drawing to take place underneath
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other windows.
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This version of StartDrawingOnTop() is used to specify that the area
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that will be drawn on coincides with the given window. It is
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recommended that an area of the screen is specified with
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StartDrawingOnTop(wxRect*) because with large regions, flickering
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effects are noticeable when destroying the temporary transparent window
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used to implement this feature.
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You might use this function when implementing a drag feature, for
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example as in the wxSplitterWindow implementation.
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@remarks This function is probably obsolete since the X implementations
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allow drawing directly on the screen now. However, the fact
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that this function allows the screen to be refreshed
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afterwards, may be useful to some applications.
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*/
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static bool StartDrawingOnTop(wxWindow* window);
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/**
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Use this in conjunction with EndDrawingOnTop() to ensure that drawing
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to the screen occurs on top of existing windows. Without this, some
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window systems (such as X) only allow drawing to take place underneath
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other windows.
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This version of StartDrawingOnTop() is used to specify an area of the
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screen which is to be drawn on. If @NULL is passed, the whole screen is
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available. It is recommended that an area of the screen is specified
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with this function rather than with StartDrawingOnTop(wxWindow*),
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because with large regions, flickering effects are noticeable when
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destroying the temporary transparent window used to implement this
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feature.
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You might use this function when implementing a drag feature, for
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example as in the wxSplitterWindow implementation.
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@remarks This function is probably obsolete since the X implementations
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allow drawing directly on the screen now. However, the fact
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that this function allows the screen to be refreshed
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afterwards, may be useful to some applications.
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*/
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static bool StartDrawingOnTop(wxRect* rect = NULL);
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};
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