View Source wxBufferedPaintDC (wx v2.4.3)
This is a subclass of wxBufferedDC which can be used inside of an EVT\_PAINT()
event handler to achieve double-buffered drawing.
Just use this class instead of wxPaintDC and make sure wxWindow:setBackgroundStyle/2 is called with
wxBG_STYLE_PAINT somewhere in the class initialization code, and that's all you have to do
to (mostly) avoid flicker. The only thing to watch out for is that if you are using this
class together with wxScrolled (not implemented in wx), you probably do not want to
call wxScrolledWindow:prepareDC/2 on it as it already does this internally for the real underlying wxPaintDC.
See:
This class is derived, and can use functions, from:
wxWidgets docs: wxBufferedPaintDC
Summary
Functions
Destroys the object
Equivalent to new(Window, []).
As with wxBufferedDC, you may either provide the bitmap to be used for buffering or
let this object create one internally (in the latter case, the size of the client part of
the window is used).
Types
-type wxBufferedPaintDC() :: wx:wx_object().
Functions
-spec destroy(This :: wxBufferedPaintDC()) -> ok.
Destroys the object
-spec new(Window) -> wxBufferedPaintDC() when Window :: wxWindow:wxWindow().
Equivalent to new(Window, []).
-spec new(Window, Buffer) -> wxBufferedPaintDC() when Window :: wxWindow:wxWindow(), Buffer :: wxBitmap:wxBitmap(); (Window, [Option]) -> wxBufferedPaintDC() when Window :: wxWindow:wxWindow(), Option :: {style, integer()}.
-spec new(Window, Buffer, [Option]) -> wxBufferedPaintDC() when Window :: wxWindow:wxWindow(), Buffer :: wxBitmap:wxBitmap(), Option :: {style, integer()}.
As with wxBufferedDC, you may either provide the bitmap to be used for buffering or
let this object create one internally (in the latter case, the size of the client part of
the window is used).
Pass wxBUFFER_CLIENT_AREA for the style parameter to indicate that just the client area
of the window is buffered, or wxBUFFER_VIRTUAL_AREA to indicate that the buffer bitmap
covers the virtual area.