504c22a512
Fix a copy-and-pasto in the header and also mention that wxURLDataObject derives from wxDataObjectComposite, and not wxTextDataObject, in wxGTK too. Also add a note about the exact base class being an implementation detail. Closes https://github.com/wxWidgets/wxWidgets/pull/624
584 lines
22 KiB
C++
584 lines
22 KiB
C++
///////////////////////////////////////////////////////////////////////////////
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// Name: wx/dataobj.h
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// Purpose: common data object classes
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// Author: Vadim Zeitlin, Robert Roebling
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// Modified by:
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// Created: 26.05.99
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// Copyright: (c) wxWidgets Team
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// Licence: wxWindows licence
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///////////////////////////////////////////////////////////////////////////////
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#ifndef _WX_DATAOBJ_H_BASE_
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#define _WX_DATAOBJ_H_BASE_
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// ----------------------------------------------------------------------------
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// headers
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// ----------------------------------------------------------------------------
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#include "wx/defs.h"
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#if wxUSE_DATAOBJ
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#include "wx/string.h"
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#include "wx/bitmap.h"
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#include "wx/list.h"
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#include "wx/arrstr.h"
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// ============================================================================
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/*
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Generic data transfer related classes. The class hierarchy is as follows:
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- wxDataObject-
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/ \
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/ \
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wxDataObjectSimple wxDataObjectComposite
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/ | \
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/ | \
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wxTextDataObject | wxBitmapDataObject
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wxCustomDataObject
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*/
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// ============================================================================
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// ----------------------------------------------------------------------------
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// wxDataFormat class is declared in platform-specific headers: it represents
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// a format for data which may be either one of the standard ones (text,
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// bitmap, ...) or a custom one which is then identified by a unique string.
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// ----------------------------------------------------------------------------
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/* the class interface looks like this (pseudo code):
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class wxDataFormat
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{
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public:
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typedef <integral type> NativeFormat;
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wxDataFormat(NativeFormat format = wxDF_INVALID);
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wxDataFormat(const wxString& format);
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wxDataFormat& operator=(NativeFormat format);
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wxDataFormat& operator=(const wxDataFormat& format);
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bool operator==(NativeFormat format) const;
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bool operator!=(NativeFormat format) const;
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void SetType(NativeFormat format);
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NativeFormat GetType() const;
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wxString GetId() const;
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void SetId(const wxString& format);
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};
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*/
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#if defined(__WXMSW__)
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#include "wx/msw/ole/dataform.h"
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#elif defined(__WXMOTIF__)
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#include "wx/motif/dataform.h"
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#elif defined(__WXGTK20__)
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#include "wx/gtk/dataform.h"
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#elif defined(__WXGTK__)
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#include "wx/gtk1/dataform.h"
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#elif defined(__WXX11__)
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#include "wx/x11/dataform.h"
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#elif defined(__WXMAC__)
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#include "wx/osx/dataform.h"
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#elif defined(__WXQT__)
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#include "wx/qt/dataform.h"
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#endif
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// the value for default argument to some functions (corresponds to
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// wxDF_INVALID)
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extern WXDLLIMPEXP_CORE const wxDataFormat& wxFormatInvalid;
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// ----------------------------------------------------------------------------
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// wxDataObject represents a piece of data which knows which formats it
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// supports and knows how to render itself in each of them - GetDataHere(),
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// and how to restore data from the buffer (SetData()).
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//
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// Although this class may be used directly (i.e. custom classes may be
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// derived from it), in many cases it might be simpler to use either
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// wxDataObjectSimple or wxDataObjectComposite classes.
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//
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// A data object may be "read only", i.e. support only GetData() functions or
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// "read-write", i.e. support both GetData() and SetData() (in principle, it
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// might be "write only" too, but this is rare). Moreover, it doesn't have to
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// support the same formats in Get() and Set() directions: for example, a data
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// object containing JPEG image might accept BMPs in GetData() because JPEG
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// image may be easily transformed into BMP but not in SetData(). Accordingly,
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// all methods dealing with formats take an additional "direction" argument
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// which is either SET or GET and which tells the function if the format needs
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// to be supported by SetData() or GetDataHere().
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// ----------------------------------------------------------------------------
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class WXDLLIMPEXP_CORE wxDataObjectBase
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{
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public:
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enum Direction
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{
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Get = 0x01, // format is supported by GetDataHere()
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Set = 0x02, // format is supported by SetData()
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Both = 0x03 // format is supported by both (unused currently)
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};
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// this class is polymorphic, hence it needs a virtual dtor
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virtual ~wxDataObjectBase();
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// get the best suited format for rendering our data
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virtual wxDataFormat GetPreferredFormat(Direction dir = Get) const = 0;
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// get the number of formats we support
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virtual size_t GetFormatCount(Direction dir = Get) const = 0;
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// return all formats in the provided array (of size GetFormatCount())
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virtual void GetAllFormats(wxDataFormat *formats,
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Direction dir = Get) const = 0;
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// get the (total) size of data for the given format
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virtual size_t GetDataSize(const wxDataFormat& format) const = 0;
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// copy raw data (in the specified format) to the provided buffer, return
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// true if data copied successfully, false otherwise
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virtual bool GetDataHere(const wxDataFormat& format, void *buf) const = 0;
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// get data from the buffer of specified length (in the given format),
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// return true if the data was read successfully, false otherwise
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virtual bool SetData(const wxDataFormat& WXUNUSED(format),
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size_t WXUNUSED(len), const void * WXUNUSED(buf))
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{
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return false;
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}
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// returns true if this format is supported
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bool IsSupported(const wxDataFormat& format, Direction dir = Get) const;
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};
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// ----------------------------------------------------------------------------
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// include the platform-specific declarations of wxDataObject
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// ----------------------------------------------------------------------------
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#if defined(__WXMSW__)
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#include "wx/msw/ole/dataobj.h"
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#elif defined(__WXMOTIF__)
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#include "wx/motif/dataobj.h"
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#elif defined(__WXX11__)
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#include "wx/x11/dataobj.h"
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#elif defined(__WXGTK20__)
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#include "wx/gtk/dataobj.h"
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#elif defined(__WXGTK__)
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#include "wx/gtk1/dataobj.h"
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#elif defined(__WXMAC__)
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#include "wx/osx/dataobj.h"
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#elif defined(__WXQT__)
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#include "wx/qt/dataobj.h"
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#endif
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// ----------------------------------------------------------------------------
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// wxDataObjectSimple is a wxDataObject which only supports one format (in
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// both Get and Set directions, but you may return false from GetDataHere() or
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// SetData() if one of them is not supported). This is the simplest possible
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// wxDataObject implementation.
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//
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// This is still an "abstract base class" (although it doesn't have any pure
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// virtual functions), to use it you should derive from it and implement
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// GetDataSize(), GetDataHere() and SetData() functions because the base class
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// versions don't do anything - they just return "not implemented".
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//
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// This class should be used when you provide data in only one format (no
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// conversion to/from other formats), either a standard or a custom one.
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// Otherwise, you should use wxDataObjectComposite or wxDataObject directly.
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// ----------------------------------------------------------------------------
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class WXDLLIMPEXP_CORE wxDataObjectSimple : public wxDataObject
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{
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public:
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// ctor takes the format we support, but it can also be set later with
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// SetFormat()
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wxDataObjectSimple(const wxDataFormat& format = wxFormatInvalid)
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: m_format(format)
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{
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}
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// get/set the format we support
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const wxDataFormat& GetFormat() const { return m_format; }
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void SetFormat(const wxDataFormat& format) { m_format = format; }
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// virtual functions to override in derived class (the base class versions
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// just return "not implemented")
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// -----------------------------------------------------------------------
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// get the size of our data
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virtual size_t GetDataSize() const
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{ return 0; }
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// copy our data to the buffer
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virtual bool GetDataHere(void *WXUNUSED(buf)) const
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{ return false; }
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// copy data from buffer to our data
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virtual bool SetData(size_t WXUNUSED(len), const void *WXUNUSED(buf))
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{ return false; }
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// implement base class pure virtuals
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// ----------------------------------
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virtual wxDataFormat GetPreferredFormat(wxDataObjectBase::Direction WXUNUSED(dir) = Get) const wxOVERRIDE
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{ return m_format; }
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virtual size_t GetFormatCount(wxDataObjectBase::Direction WXUNUSED(dir) = Get) const wxOVERRIDE
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{ return 1; }
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virtual void GetAllFormats(wxDataFormat *formats,
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wxDataObjectBase::Direction WXUNUSED(dir) = Get) const wxOVERRIDE
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{ *formats = m_format; }
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virtual size_t GetDataSize(const wxDataFormat& WXUNUSED(format)) const wxOVERRIDE
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{ return GetDataSize(); }
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virtual bool GetDataHere(const wxDataFormat& WXUNUSED(format),
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void *buf) const wxOVERRIDE
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{ return GetDataHere(buf); }
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virtual bool SetData(const wxDataFormat& WXUNUSED(format),
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size_t len, const void *buf) wxOVERRIDE
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{ return SetData(len, buf); }
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private:
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// the one and only format we support
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wxDataFormat m_format;
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wxDECLARE_NO_COPY_CLASS(wxDataObjectSimple);
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};
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// ----------------------------------------------------------------------------
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// wxDataObjectComposite is the simplest way to implement wxDataObject
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// supporting multiple formats. It contains several wxDataObjectSimple and
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// supports all formats supported by any of them.
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//
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// This class shouldn't be (normally) derived from, but may be used directly.
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// If you need more flexibility than what it provides, you should probably use
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// wxDataObject directly.
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// ----------------------------------------------------------------------------
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WX_DECLARE_EXPORTED_LIST(wxDataObjectSimple, wxSimpleDataObjectList);
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class WXDLLIMPEXP_CORE wxDataObjectComposite : public wxDataObject
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{
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public:
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// ctor
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wxDataObjectComposite();
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virtual ~wxDataObjectComposite();
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// add data object (it will be deleted by wxDataObjectComposite, hence it
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// must be allocated on the heap) whose format will become the preferred
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// one if preferred == true
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void Add(wxDataObjectSimple *dataObject, bool preferred = false);
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// Report the format passed to the SetData method. This should be the
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// format of the data object within the composite that received data from
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// the clipboard or the DnD operation. You can use this method to find
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// out what kind of data object was received.
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wxDataFormat GetReceivedFormat() const;
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// Returns the pointer to the object which supports this format or NULL.
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// The returned pointer is owned by wxDataObjectComposite and must
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// therefore not be destroyed by the caller.
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wxDataObjectSimple *GetObject(const wxDataFormat& format,
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wxDataObjectBase::Direction dir = Get) const;
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// implement base class pure virtuals
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// ----------------------------------
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virtual wxDataFormat GetPreferredFormat(wxDataObjectBase::Direction dir = Get) const wxOVERRIDE;
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virtual size_t GetFormatCount(wxDataObjectBase::Direction dir = Get) const wxOVERRIDE;
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virtual void GetAllFormats(wxDataFormat *formats, wxDataObjectBase::Direction dir = Get) const wxOVERRIDE;
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virtual size_t GetDataSize(const wxDataFormat& format) const wxOVERRIDE;
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virtual bool GetDataHere(const wxDataFormat& format, void *buf) const wxOVERRIDE;
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virtual bool SetData(const wxDataFormat& format, size_t len, const void *buf) wxOVERRIDE;
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#if defined(__WXMSW__)
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virtual const void* GetSizeFromBuffer( const void* buffer, size_t* size,
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const wxDataFormat& format ) wxOVERRIDE;
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virtual void* SetSizeInBuffer( void* buffer, size_t size,
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const wxDataFormat& format ) wxOVERRIDE;
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virtual size_t GetBufferOffset( const wxDataFormat& format ) wxOVERRIDE;
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#endif
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private:
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// the list of all (simple) data objects whose formats we support
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wxSimpleDataObjectList m_dataObjects;
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// the index of the preferred one (0 initially, so by default the first
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// one is the preferred)
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size_t m_preferred;
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wxDataFormat m_receivedFormat;
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wxDECLARE_NO_COPY_CLASS(wxDataObjectComposite);
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};
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// ============================================================================
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// Standard implementations of wxDataObjectSimple which can be used directly
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// (i.e. without having to derive from them) for standard data type transfers.
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//
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// Note that although all of them can work with provided data, you can also
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// override their virtual GetXXX() functions to only provide data on demand.
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// ============================================================================
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// ----------------------------------------------------------------------------
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// wxTextDataObject contains text data
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// ----------------------------------------------------------------------------
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#if wxUSE_UNICODE
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#if defined(__WXGTK20__) || defined(__WXX11__)
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#define wxNEEDS_UTF8_FOR_TEXT_DATAOBJ
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#elif defined(__WXMAC__)
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#define wxNEEDS_UTF16_FOR_TEXT_DATAOBJ
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#endif
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#endif // wxUSE_UNICODE
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class WXDLLIMPEXP_CORE wxHTMLDataObject : public wxDataObjectSimple
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{
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public:
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// ctor: you can specify the text here or in SetText(), or override
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// GetText()
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wxHTMLDataObject(const wxString& html = wxEmptyString)
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: wxDataObjectSimple(wxDF_HTML),
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m_html(html)
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{
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}
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// virtual functions which you may override if you want to provide text on
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// demand only - otherwise, the trivial default versions will be used
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virtual size_t GetLength() const { return m_html.Len() + 1; }
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virtual wxString GetHTML() const { return m_html; }
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virtual void SetHTML(const wxString& html) { m_html = html; }
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virtual size_t GetDataSize() const wxOVERRIDE;
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virtual bool GetDataHere(void *buf) const wxOVERRIDE;
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virtual bool SetData(size_t len, const void *buf) wxOVERRIDE;
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// Must provide overloads to avoid hiding them (and warnings about it)
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virtual size_t GetDataSize(const wxDataFormat&) const wxOVERRIDE
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{
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return GetDataSize();
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}
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virtual bool GetDataHere(const wxDataFormat&, void *buf) const wxOVERRIDE
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{
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return GetDataHere(buf);
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}
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virtual bool SetData(const wxDataFormat&, size_t len, const void *buf) wxOVERRIDE
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{
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return SetData(len, buf);
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}
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private:
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wxString m_html;
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};
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class WXDLLIMPEXP_CORE wxTextDataObject : public wxDataObjectSimple
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{
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public:
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// ctor: you can specify the text here or in SetText(), or override
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// GetText()
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wxTextDataObject(const wxString& text = wxEmptyString)
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: wxDataObjectSimple(
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#if wxUSE_UNICODE
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wxDF_UNICODETEXT
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#else
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wxDF_TEXT
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#endif
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),
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m_text(text)
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{
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}
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// virtual functions which you may override if you want to provide text on
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// demand only - otherwise, the trivial default versions will be used
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virtual size_t GetTextLength() const { return m_text.Len() + 1; }
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virtual wxString GetText() const { return m_text; }
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virtual void SetText(const wxString& text) { m_text = text; }
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// implement base class pure virtuals
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// ----------------------------------
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// some platforms have 2 and not 1 format for text data
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#if defined(wxNEEDS_UTF8_FOR_TEXT_DATAOBJ) || defined(wxNEEDS_UTF16_FOR_TEXT_DATAOBJ)
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virtual size_t GetFormatCount(Direction WXUNUSED(dir) = Get) const wxOVERRIDE { return 2; }
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virtual void GetAllFormats(wxDataFormat *formats,
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wxDataObjectBase::Direction WXUNUSED(dir) = Get) const wxOVERRIDE;
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virtual size_t GetDataSize() const wxOVERRIDE { return GetDataSize(GetPreferredFormat()); }
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virtual bool GetDataHere(void *buf) const wxOVERRIDE { return GetDataHere(GetPreferredFormat(), buf); }
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virtual bool SetData(size_t len, const void *buf) wxOVERRIDE { return SetData(GetPreferredFormat(), len, buf); }
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size_t GetDataSize(const wxDataFormat& format) const wxOVERRIDE;
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bool GetDataHere(const wxDataFormat& format, void *pBuf) const wxOVERRIDE;
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bool SetData(const wxDataFormat& format, size_t nLen, const void* pBuf) wxOVERRIDE;
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#else // !wxNEEDS_UTF{8,16}_FOR_TEXT_DATAOBJ
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virtual size_t GetDataSize() const wxOVERRIDE;
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virtual bool GetDataHere(void *buf) const wxOVERRIDE;
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virtual bool SetData(size_t len, const void *buf) wxOVERRIDE;
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// Must provide overloads to avoid hiding them (and warnings about it)
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virtual size_t GetDataSize(const wxDataFormat&) const wxOVERRIDE
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{
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return GetDataSize();
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}
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virtual bool GetDataHere(const wxDataFormat&, void *buf) const wxOVERRIDE
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{
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return GetDataHere(buf);
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}
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virtual bool SetData(const wxDataFormat&, size_t len, const void *buf) wxOVERRIDE
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{
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return SetData(len, buf);
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}
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#endif // different wxTextDataObject implementations
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private:
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wxString m_text;
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wxDECLARE_NO_COPY_CLASS(wxTextDataObject);
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};
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// ----------------------------------------------------------------------------
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// wxBitmapDataObject contains a bitmap
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// ----------------------------------------------------------------------------
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class WXDLLIMPEXP_CORE wxBitmapDataObjectBase : public wxDataObjectSimple
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{
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public:
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// ctor: you can specify the bitmap here or in SetBitmap(), or override
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// GetBitmap()
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wxBitmapDataObjectBase(const wxBitmap& bitmap = wxNullBitmap)
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: wxDataObjectSimple(wxDF_BITMAP), m_bitmap(bitmap)
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{
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}
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// virtual functions which you may override if you want to provide data on
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// demand only - otherwise, the trivial default versions will be used
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virtual wxBitmap GetBitmap() const { return m_bitmap; }
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virtual void SetBitmap(const wxBitmap& bitmap) { m_bitmap = bitmap; }
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protected:
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wxBitmap m_bitmap;
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wxDECLARE_NO_COPY_CLASS(wxBitmapDataObjectBase);
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};
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// ----------------------------------------------------------------------------
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// wxFileDataObject contains a list of filenames
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//
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// NB: notice that this is a "write only" object, it can only be filled with
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// data from drag and drop operation.
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// ----------------------------------------------------------------------------
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class WXDLLIMPEXP_CORE wxFileDataObjectBase : public wxDataObjectSimple
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{
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public:
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// ctor: use AddFile() later to fill the array
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wxFileDataObjectBase() : wxDataObjectSimple(wxDF_FILENAME) { }
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// get a reference to our array
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const wxArrayString& GetFilenames() const { return m_filenames; }
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protected:
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wxArrayString m_filenames;
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wxDECLARE_NO_COPY_CLASS(wxFileDataObjectBase);
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};
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// ----------------------------------------------------------------------------
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// wxCustomDataObject contains arbitrary untyped user data.
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//
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// It is understood that this data can be copied bitwise.
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// ----------------------------------------------------------------------------
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class WXDLLIMPEXP_CORE wxCustomDataObject : public wxDataObjectSimple
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{
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public:
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// if you don't specify the format in the ctor, you can still use
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// SetFormat() later
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wxCustomDataObject(const wxDataFormat& format = wxFormatInvalid);
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|
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// the dtor calls Free()
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virtual ~wxCustomDataObject();
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|
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// you can call SetData() to set m_data: it will make a copy of the data
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// you pass - or you can use TakeData() which won't copy anything, but
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// will take ownership of data (i.e. will call Free() on it later)
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void TakeData(size_t size, void *data);
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|
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// this function is called to allocate "size" bytes of memory from
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// SetData(). The default version uses operator new[].
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virtual void *Alloc(size_t size);
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|
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// this function is called when the data is freed, you may override it to
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// anything you want (or may be nothing at all). The default version calls
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// operator delete[] on m_data
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virtual void Free();
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|
|
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// get data: you may override these functions if you wish to provide data
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// only when it's requested
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virtual size_t GetSize() const { return m_size; }
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virtual void *GetData() const { return m_data; }
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|
|
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// implement base class pure virtuals
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|
// ----------------------------------
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virtual size_t GetDataSize() const wxOVERRIDE;
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virtual bool GetDataHere(void *buf) const wxOVERRIDE;
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virtual bool SetData(size_t size, const void *buf) wxOVERRIDE;
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// Must provide overloads to avoid hiding them (and warnings about it)
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|
virtual size_t GetDataSize(const wxDataFormat&) const wxOVERRIDE
|
|
{
|
|
return GetDataSize();
|
|
}
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virtual bool GetDataHere(const wxDataFormat&, void *buf) const wxOVERRIDE
|
|
{
|
|
return GetDataHere(buf);
|
|
}
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virtual bool SetData(const wxDataFormat&, size_t len, const void *buf) wxOVERRIDE
|
|
{
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|
return SetData(len, buf);
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|
}
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|
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private:
|
|
size_t m_size;
|
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void *m_data;
|
|
|
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wxDECLARE_NO_COPY_CLASS(wxCustomDataObject);
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|
};
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|
|
|
// ----------------------------------------------------------------------------
|
|
// include platform-specific declarations of wxXXXBase classes
|
|
// ----------------------------------------------------------------------------
|
|
|
|
#if defined(__WXMSW__)
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|
#include "wx/msw/ole/dataobj2.h"
|
|
// wxURLDataObject defined in msw/ole/dataobj2.h
|
|
#elif defined(__WXGTK20__)
|
|
#include "wx/gtk/dataobj2.h"
|
|
// wxURLDataObject defined in gtk/dataobj2.h
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|
|
|
#else
|
|
#if defined(__WXGTK__)
|
|
#include "wx/gtk1/dataobj2.h"
|
|
#elif defined(__WXX11__)
|
|
#include "wx/x11/dataobj2.h"
|
|
#elif defined(__WXMOTIF__)
|
|
#include "wx/motif/dataobj2.h"
|
|
#elif defined(__WXMAC__)
|
|
#include "wx/osx/dataobj2.h"
|
|
#elif defined(__WXQT__)
|
|
#include "wx/qt/dataobj2.h"
|
|
#endif
|
|
|
|
// wxURLDataObject is simply wxTextDataObject with a different name
|
|
class WXDLLIMPEXP_CORE wxURLDataObject : public wxTextDataObject
|
|
{
|
|
public:
|
|
wxURLDataObject(const wxString& url = wxEmptyString)
|
|
: wxTextDataObject(url)
|
|
{
|
|
}
|
|
|
|
wxString GetURL() const { return GetText(); }
|
|
void SetURL(const wxString& url) { SetText(url); }
|
|
};
|
|
#endif
|
|
|
|
#endif // wxUSE_DATAOBJ
|
|
|
|
#endif // _WX_DATAOBJ_H_BASE_
|