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	1	%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
	2	%% Name: dataform.tex
	3	%% Purpose: wxDataFormat documentation
	4	%% Author: Vadim Zeitlin
	5	%% Modified by:
	6	%% Created: 03.11.99
	7	%% RCS-ID: $Id$
	8	%% Copyright: (c) Vadim Zeitlin
	9	%% License: wxWindows license
	10	%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
	11
	12	\section{\class{wxDataFormat}}\label{wxdataformat}
	13
	14	A wxDataFormat is an encapsulation of a platform-specific format handle which
	15	is used by the system for the clipboard and drag and drop operations. The
	16	applications are usually only interested in, for example, pasting data from the
	17	clipboard only if the data is in a format the program understands and a data
	18	format is something which uniquely identifies this format.
	19
	20	On the system level, a data format is usually just a number ({\tt CLIPFORMAT}
	21	under Windows or {\tt Atom} under X11, for example) and the standard formats
	22	are, indeed, just numbers which can be implicitly converted to wxDataFormat.
	23	The standard formats are:
	24
	25	\begin{twocollist}\itemsep=1cm
	26	\twocolitem{wxDF\_INVALID}{An invalid format - used as default argument for
	27	functions taking a wxDataFormat argument sometimes}
	28	\twocolitem{wxDF\_TEXT}{Text format (wxString)}
	29	\twocolitem{wxDF\_BITMAP}{A bitmap (wxBitmap)}
	30	\twocolitem{wxDF\_METAFILE}{A metafile (wxMetafile, Windows only)}
	31	\twocolitem{wxDF\_FILENAME}{A list of filenames}
	32	\end{twocollist}
	33
	34	As mentioned above, these standard formats may be passed to any function taking
	35	wxDataFormat argument because wxDataFormat has an implicit conversion from
	36	them (or, to be precise from the type {\tt wxDataFormat::NativeFormat} which is
	37	the type used by the underlying platform for data formats).
	38
	39	Aside the standard formats, the application may also use custom formats which
	40	are identified by their names (strings) and not numeric identifiers. Although
	41	internally custom format must be created (or {\it registered}) first, you
	42	shouldn't care about it because it is done automatically the first time the
	43	wxDataFormat object corresponding to a given format name is created. The only
	44	implication of this is that you should avoid having global wxDataFormat objects
	45	with non-default constructor because their constructors are executed before the
	46	program has time to perform all necessary initialisations and so an attempt to
	47	do clipboard format registration at this time will usually lead to a crash!
	48
	49	\wxheading{Virtual functions to override}
	50
	51	None
	52
	53	\wxheading{Derived from}
	54
	55	None
	56
	57	\wxheading{See also}
	58
	59	\helpref{Clipboard and drag and drop overview}{wxdndoverview},
	60	\helpref{DnD sample}{samplednd},
	61	\helpref{wxDataObject}{wxdataobject}
	62
	63	\latexignore{\rtfignore{\wxheading{Members}}}
	64
	65	\membersection{wxDataFormat::wxDataFormat}\label{wxdataformatwxdataformatdef}
	66
	67	\func{}{wxDataFormat}{\param{NativeFormat}{ format = wxDF\_INVALID}}
	68
	69	Constructs a data format object for one of the standard data formats or an
	70	empty data object (use \helpref{SetType}{wxdataformatsettype} or
	71	\helpref{SetId}{wxdataformatsetid} later in this case)
	72
	73	\membersection{wxDataFormat::wxDataFormat}\label{wxdataformatwxdataformat}
	74
	75	\func{}{wxDataFormat}{\param{const wxChar }{*format}}
	76
	77	Constructs a data format object for a custom format identified by its name
	78	{\it format}.
	79
	80	\membersection{wxDataFormat::operator $==$}\label{wxdataformatoperatoreq}
	81
	82	\constfunc{bool}{operator $==$}{\param{const wxDataFormat\&}{ format}}
	83
	84	Returns TRUE if the formats are equal.
	85
	86	\membersection{wxDataFormat::operator $!=$}\label{wxdataformatoperatorneq}
	87
	88	\constfunc{bool}{operator $!=$}{\param{const wxDataFormat\&}{ format}}
	89
	90	Returns TRUE if the formats are different.
	91
	92	\membersection{wxDataFormat::GetId}\label{wxdataformatgetid}
	93
	94	\constfunc{wxString}{GetId}{\void}
	95
	96	Returns the name of a custom format (this function will fail for a standard
	97	format).
	98
	99	\membersection{wxDataFormat::GetType}\label{wxdataformatgettype}
	100
	101	\constfunc{NativeFormat}{GetType}{\void}
	102
	103	Returns the platform-specific number identifying the format.
	104
	105	\membersection{wxDataFormat::SetId}\label{wxdataformatsetid}
	106
	107	\func{void}{SetId}{\param{const wxChar }{*format}}
	108
	109	Sets the format to be the custom format identified by the given name.
	110
	111	\membersection{wxDataFormat::SetType}\label{wxdataformatsettype}
	112
	113	\func{void}{SetType}{\param{NativeFormat}{ format}}
	114
	115	Sets the format to the given value, which should be one of wxDF\_XXX constants.
	116