aa3d027735
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@22352 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
505 lines
19 KiB
C++
505 lines
19 KiB
C++
///////////////////////////////////////////////////////////////////////////////
|
|
// Name: wx/dataobj.h
|
|
// Purpose: common data object classes
|
|
// Author: Vadim Zeitlin, Robert Roebling
|
|
// Modified by:
|
|
// Created: 26.05.99
|
|
// RCS-ID: $Id$
|
|
// Copyright: (c) wxWindows Team
|
|
// Licence: wxWindows licence
|
|
///////////////////////////////////////////////////////////////////////////////
|
|
|
|
#ifndef _WX_DATAOBJ_H_BASE_
|
|
#define _WX_DATAOBJ_H_BASE_
|
|
|
|
#if defined(__GNUG__) && !defined(__APPLE__)
|
|
#pragma interface "dataobjbase.h"
|
|
#endif
|
|
|
|
// ----------------------------------------------------------------------------
|
|
// headers
|
|
// ----------------------------------------------------------------------------
|
|
#include "wx/defs.h"
|
|
|
|
#if wxUSE_DATAOBJ
|
|
|
|
#include "wx/string.h"
|
|
#include "wx/bitmap.h"
|
|
#include "wx/list.h"
|
|
#include "wx/arrstr.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:
|
|
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);
|
|
};
|
|
|
|
*/
|
|
|
|
#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(__WXX11__)
|
|
#include "wx/x11/dataform.h"
|
|
#elif defined(__WXMAC__)
|
|
#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(__WXGTK__)
|
|
#include "wx/gtk/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);
|
|
|
|
// 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);
|
|
|
|
protected:
|
|
// returns the pointer to the object which supports this format or NULL
|
|
wxDataObjectSimple *GetObject(const wxDataFormat& format) const;
|
|
#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
|
|
|
|
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;
|
|
|
|
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(wxUSE_UNICODE?wxDF_UNICODETEXT: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)); }
|
|
|
|
DECLARE_NO_COPY_CLASS(wxTextDataObject)
|
|
};
|
|
|
|
// ----------------------------------------------------------------------------
|
|
// 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;
|
|
|
|
DECLARE_NO_COPY_CLASS(wxBitmapDataObjectBase)
|
|
};
|
|
|
|
// ----------------------------------------------------------------------------
|
|
// 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:
|
|
wxArrayString m_filenames;
|
|
|
|
private:
|
|
// 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)); }
|
|
|
|
DECLARE_NO_COPY_CLASS(wxFileDataObjectBase)
|
|
};
|
|
|
|
// ----------------------------------------------------------------------------
|
|
// wxCustomDataObject contains arbitrary untyped user data.
|
|
//
|
|
// It is understood that this data can be copied bitwise.
|
|
// ----------------------------------------------------------------------------
|
|
|
|
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)); }
|
|
|
|
DECLARE_NO_COPY_CLASS(wxCustomDataObject)
|
|
};
|
|
|
|
// ----------------------------------------------------------------------------
|
|
// include platform-specific declarations of wxXXXBase classes
|
|
// ----------------------------------------------------------------------------
|
|
|
|
#if defined(__WXMSW__)
|
|
#include "wx/msw/ole/dataobj2.h"
|
|
|
|
// wxURLDataObject defined in msw/ole/dataobj2.h
|
|
#else // !__WXMSW__
|
|
#if defined(__WXGTK__)
|
|
#include "wx/gtk/dataobj2.h"
|
|
#elif defined(__WXX11__)
|
|
#include "wx/x11/dataobj2.h"
|
|
#elif defined(__WXMOTIF__)
|
|
#include "wx/motif/dataobj2.h"
|
|
#elif defined(__WXMAC__)
|
|
#include "wx/mac/dataobj2.h"
|
|
#elif defined(__WXCOCOA__)
|
|
#include "wx/cocoa/dataobj2.h"
|
|
#elif defined(__WXPM__)
|
|
#include "wx/os2/dataobj2.h"
|
|
#endif
|
|
|
|
// wxURLDataObject is simply wxTextDataObject with a different name
|
|
class WXDLLEXPORT wxURLDataObject : public wxTextDataObject
|
|
{
|
|
public:
|
|
wxString GetURL() const { return GetText(); }
|
|
void SetURL(const wxString& url) { SetText(url); }
|
|
};
|
|
#endif // __WXMSW__/!__WXMSW__
|
|
|
|
#endif // wxUSE_DATAOBJ
|
|
|
|
#endif // _WX_DATAOBJ_H_BASE_
|