fa482912e4
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@6718 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
117 lines
4.3 KiB
TeX
117 lines
4.3 KiB
TeX
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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%% Name: dataform.tex
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%% Purpose: wxDataFormat documentation
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%% Author: Vadim Zeitlin
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%% Modified by:
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%% Created: 03.11.99
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%% RCS-ID: $Id$
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%% Copyright: (c) Vadim Zeitlin
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%% Licence: wxWindows licence
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%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
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\section{\class{wxDataFormat}}\label{wxdataformat}
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A wxDataFormat is an encapsulation of a platform-specific format handle which
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is used by the system for the clipboard and drag and drop operations. The
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applications are usually only interested in, for example, pasting data from the
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clipboard only if the data is in a format the program understands and a data
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format is something which uniquely identifies this format.
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On the system level, a data format is usually just a number ({\tt CLIPFORMAT}
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under Windows or {\tt Atom} under X11, for example) and the standard formats
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are, indeed, just numbers which can be implicitly converted to wxDataFormat.
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The standard formats are:
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\begin{twocollist}\itemsep=1cm
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\twocolitem{wxDF\_INVALID}{An invalid format - used as default argument for
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functions taking a wxDataFormat argument sometimes}
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\twocolitem{wxDF\_TEXT}{Text format (wxString)}
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\twocolitem{wxDF\_BITMAP}{A bitmap (wxBitmap)}
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\twocolitem{wxDF\_METAFILE}{A metafile (wxMetafile, Windows only)}
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\twocolitem{wxDF\_FILENAME}{A list of filenames}
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\end{twocollist}
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As mentioned above, these standard formats may be passed to any function taking
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wxDataFormat argument because wxDataFormat has an implicit conversion from
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them (or, to be precise from the type {\tt wxDataFormat::NativeFormat} which is
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the type used by the underlying platform for data formats).
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Aside the standard formats, the application may also use custom formats which
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are identified by their names (strings) and not numeric identifiers. Although
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internally custom format must be created (or {\it registered}) first, you
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shouldn't care about it because it is done automatically the first time the
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wxDataFormat object corresponding to a given format name is created. The only
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implication of this is that you should avoid having global wxDataFormat objects
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with non-default constructor because their constructors are executed before the
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program has time to perform all necessary initialisations and so an attempt to
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do clipboard format registration at this time will usually lead to a crash!
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\wxheading{Virtual functions to override}
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None
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\wxheading{Derived from}
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None
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\wxheading{See also}
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\helpref{Clipboard and drag and drop overview}{wxdndoverview},
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\helpref{DnD sample}{samplednd},
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\helpref{wxDataObject}{wxdataobject}
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\latexignore{\rtfignore{\wxheading{Members}}}
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\membersection{wxDataFormat::wxDataFormat}\label{wxdataformatwxdataformatdef}
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\func{}{wxDataFormat}{\param{NativeFormat}{ format = wxDF\_INVALID}}
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Constructs a data format object for one of the standard data formats or an
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empty data object (use \helpref{SetType}{wxdataformatsettype} or
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\helpref{SetId}{wxdataformatsetid} later in this case)
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\membersection{wxDataFormat::wxDataFormat}\label{wxdataformatwxdataformat}
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\func{}{wxDataFormat}{\param{const wxChar }{*format}}
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Constructs a data format object for a custom format identified by its name
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{\it format}.
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\membersection{wxDataFormat::operator $==$}\label{wxdataformatoperatoreq}
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\constfunc{bool}{operator $==$}{\param{const wxDataFormat\&}{ format}}
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Returns TRUE if the formats are equal.
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\membersection{wxDataFormat::operator $!=$}\label{wxdataformatoperatorneq}
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\constfunc{bool}{operator $!=$}{\param{const wxDataFormat\&}{ format}}
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Returns TRUE if the formats are different.
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\membersection{wxDataFormat::GetId}\label{wxdataformatgetid}
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\constfunc{wxString}{GetId}{\void}
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Returns the name of a custom format (this function will fail for a standard
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format).
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\membersection{wxDataFormat::GetType}\label{wxdataformatgettype}
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\constfunc{NativeFormat}{GetType}{\void}
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Returns the platform-specific number identifying the format.
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\membersection{wxDataFormat::SetId}\label{wxdataformatsetid}
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\func{void}{SetId}{\param{const wxChar }{*format}}
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Sets the format to be the custom format identified by the given name.
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\membersection{wxDataFormat::SetType}\label{wxdataformatsettype}
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\func{void}{SetType}{\param{NativeFormat}{ format}}
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Sets the format to the given value, which should be one of wxDF\_XXX constants.
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