///////////////////////////////////////////////////////////////////////////////
-// Name: dataobj.h
+// Name: wx/dataobj.h
// Purpose: common data object classes
-// Author: Robert Roebling, Vadim Zeitlin
+// Author: Vadim Zeitlin, Robert Roebling
// Modified by:
// Created: 26.05.99
// RCS-ID: $Id$
#ifndef _WX_DATAOBJ_H_BASE_
#define _WX_DATAOBJ_H_BASE_
-#if defined(__WXMSW__)
+#ifdef __GNUG__
+ #pragma interface "dataobjbase.h"
+#endif
+
// ----------------------------------------------------------------------------
-// wxDataFormat identifies the single format of data
+// headers
// ----------------------------------------------------------------------------
-class WXDLLEXPORT wxDataFormat
+#include "wx/defs.h"
+#include "wx/string.h"
+#include "wx/bitmap.h"
+#include "wx/list.h"
+
+// ============================================================================
+/*
+ Generic data transfer related classes. The class hierarchy is as follows:
+
+ - wxDataObject-
+ / \
+ / \
+ wxDataObjectSimple wxDataObjectComposite
+ / | \
+ / | \
+ wxTextDataObject | wxBitmapDataObject
+ |
+ wxCustomDataObject
+
+*/
+// ============================================================================
+
+// ----------------------------------------------------------------------------
+// wxDataFormat class is declared in platform-specific headers: it represents
+// a format for data which may be either one of the standard ones (text,
+// bitmap, ...) or a custom one which is then identified by a unique string.
+// ----------------------------------------------------------------------------
+
+/* the class interface looks like this (pseudo code):
+
+class wxDataFormat
{
public:
- // the clipboard formats under Win32 are UINTs
- typedef unsigned int NativeFormat;
-
- wxDataFormat(NativeFormat format = wxDF_INVALID) { m_format = format; }
- wxDataFormat& operator=(NativeFormat format)
- { m_format = format; return *this; }
-
- // defautl copy ctor/assignment operators ok
-
- // comparison (must have both versions)
- bool operator==(wxDataFormatId format) const
- { return m_format == (NativeFormat)format; }
- bool operator!=(wxDataFormatId format) const
- { return m_format != (NativeFormat)format; }
- bool operator==(const wxDataFormat& format) const
- { return m_format == format.m_format; }
- bool operator!=(const wxDataFormat& format) const
- { return m_format != format.m_format; }
-
- // explicit and implicit conversions to NativeFormat which is one of
- // standard data types (implicit conversion is useful for preserving the
- // compatibility with old code)
- NativeFormat GetFormatId() const { return m_format; }
- operator NativeFormat() const { return m_format; }
-
- // this only works with standard ids
- void SetId(wxDataFormatId format) { m_format = format; }
-
- // string ids are used for custom types - this SetId() must be used for
- // application-specific formats
+ typedef <integral type> NativeFormat;
+
+ wxDataFormat(NativeFormat format = wxDF_INVALID);
+ wxDataFormat(const wxChar *format);
+
+ wxDataFormat& operator=(NativeFormat format);
+ wxDataFormat& operator=(const wxDataFormat& format);
+
+ bool operator==(NativeFormat format) const;
+ bool operator!=(NativeFormat format) const;
+
+ void SetType(NativeFormat format);
+ NativeFormat GetType() const;
+
wxString GetId() const;
void SetId(const wxChar *format);
+};
-private:
- // returns TRUE if the format is one of those defined in wxDataFormatId
- bool IsStandard() const { return m_format > 0 && m_format < wxDF_MAX; }
+*/
- NativeFormat m_format;
+#if defined(__WXMSW__)
+ #include "wx/msw/ole/dataform.h"
+#elif defined(__WXMOTIF__)
+ #include "wx/motif/dataform.h"
+#elif defined(__WXGTK__)
+ #include "wx/gtk/dataform.h"
+#elif defined(__WXMAC__)
+ #include "wx/mac/dataform.h"
+#elif defined(__WXPM__)
+ #include "wx/os2/dataform.h"
+#endif
+
+// the value for default argument to some functions (corresponds to
+// wxDF_INVALID)
+extern 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;
+ }
};
+// ----------------------------------------------------------------------------
+// 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(__WXQT__)
#include "wx/qt/dnd.h"
#elif defined(__WXMAC__)
- #include "wx/mac/dnd.h"
+ #include "wx/mac/dataobj.h"
+#elif defined(__WXPM__)
+ #include "wx/os2/dataobj.h"
#elif defined(__WXSTUBS__)
#include "wx/stubs/dnd.h"
#endif
-// ---------------------------------------------------------------------------
-// wxPrivateDataObject is a specialization of wxDataObject for app specific
-// data (of some given kind, derive directly from wxDataObject if you wish to
-// efficiently support multiple formats)
-// ---------------------------------------------------------------------------
+// ----------------------------------------------------------------------------
+// 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 wxPrivateDataObject : public wxDataObject
+class WXDLLEXPORT wxDataObjectSimple : public wxDataObject
{
- DECLARE_DYNAMIC_CLASS( wxPrivateDataObject )
+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;
+};
+
+// ----------------------------------------------------------------------------
+// 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_LIST(wxDataObjectSimple, wxSimpleDataObjectList);
+
+class WXDLLEXPORT wxDataObjectComposite : public wxDataObject
+{
public:
- wxPrivateDataObject();
- virtual ~wxPrivateDataObject() { Free(); }
+ // ctor
+ wxDataObjectComposite() { m_preferred = 0; }
- // get the format object - it is used to decide whether we support the
- // given output format or not
- wxDataFormat& GetFormat() { return m_format; }
+ // 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);
- // set data. will make copy of the data
- void SetData( const void *data, size_t size );
+ // 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);
- // returns pointer to data
- void *GetData() const { return m_data; }
+protected:
+ // returns the pointer to the object which supports this format or NULL
+ wxDataObjectSimple *GetObject(const wxDataFormat& format) const;
- // get the size of the data
- virtual size_t GetSize() const;
+private:
+ // the list of all (simple) data objects whose formats we support
+ wxSimpleDataObjectList m_dataObjects;
- // copy data to the given buffer
- virtual void WriteData( void *dest ) const;
+ // the index of the preferred one (0 initially, so by default the first
+ // one is the preferred)
+ size_t m_preferred;
+};
- // these functions are provided for wxGTK compatibility, their usage is
- // deprecated - use GetFormat().SetId() instead
- void SetId( const wxString& id ) { m_format.SetId(id); }
- wxString GetId() const { return m_format.GetId(); }
+// ============================================================================
+// 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.
+// ============================================================================
- // implement the base class pure virtuals
- virtual wxDataFormatId GetPreferredFormat() const
- { return m_format; }
- virtual bool IsSupportedFormat(wxDataFormat format) const
- { return m_format == format; }
- virtual size_t GetDataSize() const
- { return m_size; }
- virtual void GetDataHere(void *dest) const
- { WriteData(dest); }
+// ----------------------------------------------------------------------------
+// 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(wxDF_TEXT), m_text(text)
+ {
+ }
+
+ // virtual functions which you may override if you want to provide text on
+ // demand only - otherwise, the trivial default versions will be used
+ virtual size_t GetTextLength() const { return m_text.Len() + 1; }
+ virtual wxString GetText() const { return m_text; }
+ virtual void SetText(const wxString& text) { m_text = text; }
+
+ // implement base class pure virtuals
+ // ----------------------------------
+ virtual size_t GetDataSize() const;
+ virtual bool GetDataHere(void *buf) const;
+ virtual bool SetData(size_t len, const void *buf);
+
+private:
+ wxString m_text;
+
+ // virtual function hiding supression
+ size_t GetDataSize(const wxDataFormat& format) const
+ { return(wxDataObjectSimple::GetDataSize(format)); }
+ bool GetDataHere(const wxDataFormat& format, void *pBuf) const
+ { return(wxDataObjectSimple::GetDataHere(format, pBuf)); }
+ bool SetData(const wxDataFormat& format, size_t nLen, const void* pBuf)
+ { return(wxDataObjectSimple::SetData(format, nLen, pBuf)); }
+};
+
+// ----------------------------------------------------------------------------
+// wxBitmapDataObject contains a bitmap
+// ----------------------------------------------------------------------------
+
+class WXDLLEXPORT wxBitmapDataObjectBase : public wxDataObjectSimple
+{
+public:
+ // ctor: you can specify the bitmap here or in SetBitmap(), or override
+ // GetBitmap()
+ wxBitmapDataObjectBase(const wxBitmap& bitmap = wxNullBitmap)
+ : wxDataObjectSimple(wxDF_BITMAP), m_bitmap(bitmap)
+ {
+ }
+
+ // virtual functions which you may override if you want to provide data on
+ // demand only - otherwise, the trivial default versions will be used
+ virtual wxBitmap GetBitmap() const { return m_bitmap; }
+ virtual void SetBitmap(const wxBitmap& bitmap) { m_bitmap = bitmap; }
+
+protected:
+ wxBitmap m_bitmap;
+};
+
+// ----------------------------------------------------------------------------
+// wxFileDataObject contains a list of filenames
+//
+// NB: notice that this is a "write only" object, it can only be filled with
+// data from drag and drop operation.
+// ----------------------------------------------------------------------------
+
+class WXDLLEXPORT wxFileDataObjectBase : public wxDataObjectSimple
+{
+public:
+ // ctor: use AddFile() later to fill the array
+ wxFileDataObjectBase() : wxDataObjectSimple(wxDF_FILENAME) { }
+
+ // get a reference to our array
+ const wxArrayString& GetFilenames() const { return m_filenames; }
+
+ // the Get() functions do nothing for us
+ virtual size_t GetDataSize() const { return 0; }
+ virtual bool GetDataHere(void *WXUNUSED(buf)) const { return FALSE; }
protected:
- // the function which really copies the data - called by WriteData() above
- // and uses GetSize() to get the size of the data
- //
- // VZ: I really wonder why do we need it
- void WriteData( const void *data, void *dest ) const;
+ wxArrayString m_filenames;
private:
- // free the data
- inline void Free();
+ // Virtual function hiding supression
+ size_t GetDataSize(const wxDataFormat& format) const
+ { return(wxDataObjectSimple::GetDataSize(format)); }
+ bool GetDataHere(const wxDataFormat& format, void* pBuf) const
+ { return(wxDataObjectSimple::GetDataHere(format, pBuf)); }
+};
- // the data
- size_t m_size;
- void *m_data;
+// ----------------------------------------------------------------------------
+// wxCustomDataObject contains arbitrary untyped user data.
+//
+// It is understood that this data can be copied bitwise.
+// ----------------------------------------------------------------------------
- // the data format
- wxDataFormat m_format;
+class WXDLLEXPORT wxCustomDataObject : public wxDataObjectSimple
+{
+public:
+ // if you don't specify the format in the ctor, you can still use
+ // SetFormat() later
+ wxCustomDataObject(const wxDataFormat& format = wxFormatInvalid);
+
+ // the dtor calls Free()
+ virtual ~wxCustomDataObject();
+
+ // you can call SetData() to set m_data: it will make a copy of the data
+ // you pass - or you can use TakeData() which won't copy anything, but
+ // will take ownership of data (i.e. will call Free() on it later)
+ void TakeData(size_t size, void *data);
+
+ // this function is called to allocate "size" bytes of memory from
+ // SetData(). The default version uses operator new[].
+ virtual void *Alloc(size_t size);
+
+ // this function is called when the data is freed, you may override it to
+ // anything you want (or may be nothing at all). The default version calls
+ // operator delete[] on m_data
+ virtual void Free();
+
+ // get data: you may override these functions if you wish to provide data
+ // only when it's requested
+ virtual size_t GetSize() const { return m_size; }
+ virtual void *GetData() const { return m_data; }
+
+ // implement base class pure virtuals
+ // ----------------------------------
+ virtual size_t GetDataSize() const;
+ virtual bool GetDataHere(void *buf) const;
+ virtual bool SetData(size_t size, const void *buf);
+
+private:
+ size_t m_size;
+ void *m_data;
+
+ // virtual function hiding supression
+ size_t GetDataSize(const wxDataFormat& format) const
+ { return(wxDataObjectSimple::GetDataSize(format)); }
+ bool GetDataHere(const wxDataFormat& format, void* pBuf) const
+ { return(wxDataObjectSimple::GetDataHere(format, pBuf)); }
+ bool SetData(const wxDataFormat& format, size_t nLen, const void* pBuf)
+ { return(wxDataObjectSimple::SetData(format, nLen, pBuf)); }
};
+// ----------------------------------------------------------------------------
+// include platform-specific declarations of wxXXXBase classes
+// ----------------------------------------------------------------------------
+#if defined(__WXMSW__)
+ #include "wx/msw/ole/dataobj2.h"
+#elif defined(__WXMOTIF__)
+ // #include "wx/motif/dataobj2.h" -- not yet
+#elif defined(__WXGTK__)
+ #include "wx/gtk/dataobj2.h"
+#elif defined(__WXMAC__)
+ #include "wx/mac/dataobj2.h"
+#elif defined(__WXPM__)
+ #include "wx/os2/dataobj2.h"
#endif
- // _WX_DATAOBJ_H_BASE_
+
+#endif // _WX_DATAOBJ_H_BASE_
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