+ #include "wx/mac/dataform.h"
+#elif defined(__WXCOCOA__)
+ #include "wx/cocoa/dataform.h"
+#elif defined(__WXPM__)
+ #include "wx/os2/dataform.h"
+#endif
+
+// the value for default argument to some functions (corresponds to
+// wxDF_INVALID)
+extern WXDLLEXPORT const wxDataFormat& wxFormatInvalid;
+
+// ----------------------------------------------------------------------------
+// wxDataObject represents a piece of data which knows which formats it
+// supports and knows how to render itself in each of them - GetDataHere(),
+// and how to restore data from the buffer (SetData()).
+//
+// Although this class may be used directly (i.e. custom classes may be
+// derived from it), in many cases it might be simpler to use either
+// wxDataObjectSimple or wxDataObjectComposite classes.
+//
+// A data object may be "read only", i.e. support only GetData() functions or
+// "read-write", i.e. support both GetData() and SetData() (in principle, it
+// might be "write only" too, but this is rare). Moreover, it doesn't have to
+// support the same formats in Get() and Set() directions: for example, a data
+// object containing JPEG image might accept BMPs in GetData() because JPEG
+// image may be easily transformed into BMP but not in SetData(). Accordingly,
+// all methods dealing with formats take an additional "direction" argument
+// which is either SET or GET and which tells the function if the format needs
+// to be supported by SetData() or GetDataHere().
+// ----------------------------------------------------------------------------
+
+class WXDLLEXPORT wxDataObjectBase
+{
+public:
+ enum Direction
+ {
+ Get = 0x01, // format is supported by GetDataHere()
+ Set = 0x02, // format is supported by SetData()
+ Both = 0x03 // format is supported by both (unused currently)
+ };
+
+ // this class is polymorphic, hence it needs a virtual dtor
+ virtual ~wxDataObjectBase();
+
+ // get the best suited format for rendering our data
+ virtual wxDataFormat GetPreferredFormat(Direction dir = Get) const = 0;
+
+ // get the number of formats we support
+ virtual size_t GetFormatCount(Direction dir = Get) const = 0;
+
+ // return all formats in the provided array (of size GetFormatCount())
+ virtual void GetAllFormats(wxDataFormat *formats,
+ Direction dir = Get) const = 0;
+
+ // get the (total) size of data for the given format
+ virtual size_t GetDataSize(const wxDataFormat& format) const = 0;
+
+ // copy raw data (in the specified format) to the provided buffer, return
+ // true if data copied successfully, false otherwise
+ virtual bool GetDataHere(const wxDataFormat& format, void *buf) const = 0;
+
+ // get data from the buffer of specified length (in the given format),
+ // return true if the data was read successfully, false otherwise
+ virtual bool SetData(const wxDataFormat& WXUNUSED(format),
+ size_t WXUNUSED(len), const void * WXUNUSED(buf))
+ {
+ return false;
+ }
+
+ // returns true if this format is supported
+ bool IsSupported(const wxDataFormat& format, Direction dir = Get) const;
+};
+
+// ----------------------------------------------------------------------------
+// include the platform-specific declarations of wxDataObject
+// ----------------------------------------------------------------------------
+
+#if defined(__WXMSW__)
+ #include "wx/msw/ole/dataobj.h"
+#elif defined(__WXMOTIF__)
+ #include "wx/motif/dataobj.h"
+#elif defined(__WXX11__)
+ #include "wx/x11/dataobj.h"
+#elif defined(__WXGTK20__)
+ #include "wx/gtk/dataobj.h"
+#elif defined(__WXGTK__)
+ #include "wx/gtk1/dataobj.h"
+#elif defined(__WXMAC__)
+ #include "wx/mac/dataobj.h"
+#elif defined(__WXCOCOA__)
+ #include "wx/cocoa/dataobj.h"
+#elif defined(__WXPM__)
+ #include "wx/os2/dataobj.h"
+#endif
+
+// ----------------------------------------------------------------------------
+// wxDataObjectSimple is a wxDataObject which only supports one format (in
+// both Get and Set directions, but you may return false from GetDataHere() or
+// SetData() if one of them is not supported). This is the simplest possible
+// wxDataObject implementation.
+//
+// This is still an "abstract base class" (although it doesn't have any pure
+// virtual functions), to use it you should derive from it and implement
+// GetDataSize(), GetDataHere() and SetData() functions because the base class
+// versions don't do anything - they just return "not implemented".
+//
+// This class should be used when you provide data in only one format (no
+// conversion to/from other formats), either a standard or a custom one.
+// Otherwise, you should use wxDataObjectComposite or wxDataObject directly.
+// ----------------------------------------------------------------------------
+
+class WXDLLEXPORT wxDataObjectSimple : public wxDataObject
+{
+public:
+ // ctor takes the format we support, but it can also be set later with
+ // SetFormat()
+ wxDataObjectSimple(const wxDataFormat& format = wxFormatInvalid)
+ : m_format(format)
+ {
+ }
+
+ // get/set the format we support
+ const wxDataFormat& GetFormat() const { return m_format; }
+ void SetFormat(const wxDataFormat& format) { m_format = format; }
+
+ // virtual functions to override in derived class (the base class versions
+ // just return "not implemented")
+ // -----------------------------------------------------------------------
+
+ // get the size of our data
+ virtual size_t GetDataSize() const
+ { return 0; }
+
+ // copy our data to the buffer
+ virtual bool GetDataHere(void *WXUNUSED(buf)) const
+ { return false; }
+
+ // copy data from buffer to our data
+ virtual bool SetData(size_t WXUNUSED(len), const void *WXUNUSED(buf))
+ { return false; }
+
+ // implement base class pure virtuals
+ // ----------------------------------
+ virtual wxDataFormat GetPreferredFormat(wxDataObjectBase::Direction WXUNUSED(dir) = Get) const
+ { return m_format; }
+ virtual size_t GetFormatCount(wxDataObjectBase::Direction WXUNUSED(dir) = Get) const
+ { return 1; }
+ virtual void GetAllFormats(wxDataFormat *formats,
+ wxDataObjectBase::Direction WXUNUSED(dir) = Get) const
+ { *formats = m_format; }
+ virtual size_t GetDataSize(const wxDataFormat& WXUNUSED(format)) const
+ { return GetDataSize(); }
+ virtual bool GetDataHere(const wxDataFormat& WXUNUSED(format),
+ void *buf) const
+ { return GetDataHere(buf); }
+ virtual bool SetData(const wxDataFormat& WXUNUSED(format),
+ size_t len, const void *buf)
+ { return SetData(len, buf); }
+
+private:
+ // the one and only format we support
+ wxDataFormat m_format;
+
+ DECLARE_NO_COPY_CLASS(wxDataObjectSimple)
+};
+
+// ----------------------------------------------------------------------------
+// wxDataObjectComposite is the simplest way to implement wxDataObject
+// supporting multiple formats. It contains several wxDataObjectSimple and
+// supports all formats supported by any of them.
+//
+// This class shouldn't be (normally) derived from, but may be used directly.
+// If you need more flexibility than what it provides, you should probably use
+// wxDataObject directly.
+// ----------------------------------------------------------------------------
+
+WX_DECLARE_EXPORTED_LIST(wxDataObjectSimple, wxSimpleDataObjectList);
+
+class WXDLLEXPORT wxDataObjectComposite : public wxDataObject
+{
+public:
+ // ctor
+ wxDataObjectComposite();
+ virtual ~wxDataObjectComposite();
+
+ // add data object (it will be deleted by wxDataObjectComposite, hence it
+ // must be allocated on the heap) whose format will become the preferred
+ // one if preferred == true
+ void Add(wxDataObjectSimple *dataObject, bool preferred = false);
+
+ // Report the format passed to the SetData method. This should be the
+ // format of the data object within the composite that recieved data from
+ // the clipboard or the DnD operation. You can use this method to find
+ // out what kind of data object was recieved.
+ wxDataFormat GetReceivedFormat() const;
+
+ // implement base class pure virtuals
+ // ----------------------------------
+ virtual wxDataFormat GetPreferredFormat(wxDataObjectBase::Direction dir = Get) const;
+ virtual size_t GetFormatCount(wxDataObjectBase::Direction dir = Get) const;
+ virtual void GetAllFormats(wxDataFormat *formats, wxDataObjectBase::Direction dir = Get) const;
+ virtual size_t GetDataSize(const wxDataFormat& format) const;
+ virtual bool GetDataHere(const wxDataFormat& format, void *buf) const;
+ virtual bool SetData(const wxDataFormat& format, size_t len, const void *buf);
+#if defined(__WXMSW__)
+ virtual const void* GetSizeFromBuffer( const void* buffer, size_t* size,
+ const wxDataFormat& format );
+ virtual void* SetSizeInBuffer( void* buffer, size_t size,
+ const wxDataFormat& format );
+ virtual size_t GetBufferOffset( const wxDataFormat& format );
+#endif
+
+protected:
+ // returns the pointer to the object which supports this format or NULL
+ wxDataObjectSimple *GetObject(const wxDataFormat& format) const;
+
+private:
+ // the list of all (simple) data objects whose formats we support
+ wxSimpleDataObjectList m_dataObjects;
+
+ // the index of the preferred one (0 initially, so by default the first
+ // one is the preferred)
+ size_t m_preferred;
+
+ wxDataFormat m_receivedFormat;
+
+ DECLARE_NO_COPY_CLASS(wxDataObjectComposite)
+};
+
+// ============================================================================
+// Standard implementations of wxDataObjectSimple which can be used directly
+// (i.e. without having to derive from them) for standard data type transfers.
+//
+// Note that although all of them can work with provided data, you can also
+// override their virtual GetXXX() functions to only provide data on demand.
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// wxTextDataObject contains text data
+// ----------------------------------------------------------------------------
+
+class WXDLLEXPORT wxTextDataObject : public wxDataObjectSimple
+{
+public:
+ // ctor: you can specify the text here or in SetText(), or override
+ // GetText()
+ wxTextDataObject(const wxString& text = wxEmptyString)
+ : wxDataObjectSimple(
+#if wxUSE_UNICODE
+ wxDF_UNICODETEXT
+#else
+ wxDF_TEXT
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