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	1	%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
	2	%% Name: bufferdc.tex
	3	%% Purpose: wxBufferedDC documentation
	4	%% Author: Vadim Zeitlin
	5	%% Modified by:
	6	%% Created: 07.02.04
	7	%% RCS-ID: $Id$
	8	%% Copyright: (c) 2004 Vadim Zeitlin
	9	%% License: wxWidgets license
	10	%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
	11
	12	\section{\class{wxBufferedDC}}\label{wxbuffereddc}
	13
	14	This simple class provides a simple way to avoid flicker: when drawing on it,
	15	everything is in fact first drawn on an in-memory buffer (a
	16	\helpref{wxBitmap}{wxbitmap}) and then copied to the screen only once, when this
	17	object is destroyed.
	18
	19	It can be used in the same way as any other device context. wxBufferedDC itself
	20	typically replaces \helpref{wxClientDC}{wxclientdc}, if you want to use it in
	21	your \texttt{OnPaint()} handler, you should look at
	22	\helpref{wxBufferedPaintDC}{wxbufferedpaintdc}.
	23
	24	\wxheading{Derived from}
	25
	26	\helpref{wxMemoryDC}{wxmemorydc}\\
	27	\helpref{wxDC}{wxdc}\\
	28	\helpref{wxObject}{wxobject}
	29
	30	\wxheading{Include files}
	31
	32	<wx/dcbuffer.h>
	33
	34	\wxheading{See also}
	35
	36	\helpref{wxDC}{wxdc}
	37
	38
	39	\latexignore{\rtfignore{\wxheading{Members}}}
	40
	41	\membersection{wxBufferedDC::wxBufferedDC}\label{wxbuffereddcctor}
	42
	43	\func{}{wxBufferedDC}{\void}
	44
	45	\func{}{wxBufferedDC}{\param{wxDC *}{dc}, \param{const wxSize\& }{area}}
	46
	47	\func{}{wxBufferedDC}{\param{wxDC *}{dc}, \param{const wxBitmap\& }{buffer}}
	48
	49	If you use the first, default, constructor, you must call one of the
	50	\helpref{Init}{wxbuffereddcinit} methods later in order to use the object.
	51
	52	The other constructors initialize the object immediately and \texttt{Init()}
	53	must not be called after using them.
	54
	55	\wxheading{Parameters}
	56
	57	\docparam{dc}{The underlying DC: everything drawn to this object will be
	58	flushed to this DC when this object is destroyed. You may pass NULL
	59	in order to just initialize the buffer, and not flush it.}
	60
	61	\docparam{area}{The size of the bitmap to be used for buffering (this bitmap is
	62	created internally when it is not given explicitly).}
	63
	64	\docparam{buffer}{Explicitly provided bitmap to be used for buffering: this is
	65	the most efficient solution as the bitmap doesn't have to be recreated each
	66	time but it also requires more memory as the bitmap is never freed. The bitmap
	67	should have appropriate size, anything drawn outside of its bounds is clipped.}
	68
	69
	70	\membersection{wxBufferedDC::Init}\label{wxbuffereddcinit}
	71
	72	\func{void}{Init}{\param{wxDC *}{dc}, \param{const wxSize\& }{area}}
	73
	74	\func{void}{Init}{\param{wxDC *}{dc}, \param{const wxBitmap\& }{buffer}}
	75
	76	These functions initialize the object created using the default constructor.
	77	Please see \helpref{constructors documentation}{wxbuffereddcctor} for details.
	78
	79
	80	% VZ: UnMask() intentionally not documented, we might want to make it private
	81
	82
	83	\membersection{wxBufferedDC::\destruct{wxBufferedDC}}\label{wxbuffereddcdtor}
	84
	85	Copies everything drawn on the DC so far to the underlying DC associated with
	86	this object, if any.
	87
	88
	89	%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
	90
	91	\section{\class{wxBufferedPaintDC}}\label{wxbufferedpaintdc}
	92
	93	This is a subclass of \helpref{wxBufferedDC}{wxbuffereddc} which can be used
	94	inside of an \texttt{OnPaint()} event handler. Just create an object of this class instead
	95	of \helpref{wxPaintDC}{wxpaintdc} and that's all you have to do to (mostly)
	96	avoid flicker. The only thing to watch out for is that if you are using this
	97	class together with \helpref{wxScrolledWindow}{wxscrolledwindow}, you probably
	98	do \textbf{not} want to call \helpref{PrepareDC}{wxscrolledwindowpreparedc} on it as it
	99	already does this internally for the real underlying wxPaintDC.
	100
	101	\wxheading{Derived from}
	102
	103	\helpref{wxMemoryDC}{wxmemorydc}\\
	104	\helpref{wxDC}{wxdc}\\
	105	\helpref{wxObject}{wxobject}
	106
	107	\wxheading{Include files}
	108
	109	<wx/dcbuffer.h>
	110
	111
	112	\latexignore{\rtfignore{\wxheading{Members}}}
	113
	114	\membersection{wxBufferedPaintDC::wxBufferedPaintDC}\label{wxbufferedpaintdcctor}
	115
	116	\func{}{wxBufferedPaintDC}{\param{wxWindow *}{window}, \param{const wxBitmap\& }{buffer = wxNullBitmap}}
	117
	118	As with \helpref{wxBufferedDC}{wxbuffereddcctor}, you may either provide the
	119	bitmap to be used for buffering or let this object create one internally (in
	120	the latter case, the size of the client part of the window is used).
	121
	122
	123	\membersection{wxBufferedPaintDC::\destruct{wxBufferedPaintDC}}\label{wxbufferedpaintdcdtor}
	124
	125	Copies everything drawn on the DC so far to the window associated with this
	126	object, using a \helpref{wxPaintDC}{wxpaintdc}.
	127
	128