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