580 lines
19 KiB
C++
580 lines
19 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: wx/variant.h
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// Purpose: wxVariant class, container for any type
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// Author: Julian Smart
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// Modified by:
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// Created: 10/09/98
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// RCS-ID: $Id: variant.h 66608 2011-01-06 11:06:12Z SC $
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// Copyright: (c) Julian Smart
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// Licence: wxWindows licence
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/////////////////////////////////////////////////////////////////////////////
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#ifndef _WX_VARIANT_H_
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#define _WX_VARIANT_H_
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#include "wx/defs.h"
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#if wxUSE_VARIANT
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#include "wx/object.h"
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#include "wx/string.h"
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#include "wx/arrstr.h"
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#include "wx/list.h"
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#include "wx/cpp.h"
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#include "wx/longlong.h"
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#if wxUSE_DATETIME
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#include "wx/datetime.h"
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#endif // wxUSE_DATETIME
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#include "wx/iosfwrap.h"
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class wxAny;
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/*
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* wxVariantData stores the actual data in a wxVariant object,
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* to allow it to store any type of data.
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* Derive from this to provide custom data handling.
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*
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* NB: When you construct a wxVariantData, it will have refcount
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* of one. Refcount will not be further increased when
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* it is passed to wxVariant. This simulates old common
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* scenario where wxVariant took ownership of wxVariantData
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* passed to it.
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* If you create wxVariantData for other reasons than passing
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* it to wxVariant, technically you are not required to call
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* DecRef() before deleting it.
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*
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* TODO: in order to replace wxPropertyValue, we would need
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* to consider adding constructors that take pointers to C++ variables,
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* or removing that functionality from the wxProperty library.
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* Essentially wxPropertyValue takes on some of the wxValidator functionality
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* by storing pointers and not just actual values, allowing update of C++ data
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* to be handled automatically. Perhaps there's another way of doing this without
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* overloading wxVariant with unnecessary functionality.
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*/
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class WXDLLIMPEXP_BASE wxVariantData : public wxObjectRefData
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{
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friend class wxVariant;
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public:
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wxVariantData() { }
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// Override these to provide common functionality
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virtual bool Eq(wxVariantData& data) const = 0;
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#if wxUSE_STD_IOSTREAM
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virtual bool Write(wxSTD ostream& WXUNUSED(str)) const { return false; }
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#endif
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virtual bool Write(wxString& WXUNUSED(str)) const { return false; }
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#if wxUSE_STD_IOSTREAM
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virtual bool Read(wxSTD istream& WXUNUSED(str)) { return false; }
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#endif
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virtual bool Read(wxString& WXUNUSED(str)) { return false; }
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// What type is it? Return a string name.
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virtual wxString GetType() const = 0;
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// If it based on wxObject return the ClassInfo.
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virtual wxClassInfo* GetValueClassInfo() { return NULL; }
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// Implement this to make wxVariant::UnShare work. Returns
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// a copy of the data.
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virtual wxVariantData* Clone() const { return NULL; }
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#if wxUSE_ANY
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// Converts value to wxAny, if possible. Return true if successful.
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virtual bool GetAsAny(wxAny* WXUNUSED(any)) const { return false; }
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#endif
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protected:
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// Protected dtor should make some incompatible code
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// break more louder. That is, they should do data->DecRef()
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// instead of delete data.
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virtual ~wxVariantData() { }
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};
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/*
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* wxVariant can store any kind of data, but has some basic types
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* built in.
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*/
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class WXDLLIMPEXP_FWD_BASE wxVariant;
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WX_DECLARE_LIST_WITH_DECL(wxVariant, wxVariantList, class WXDLLIMPEXP_BASE);
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class WXDLLIMPEXP_BASE wxVariant: public wxObject
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{
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public:
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wxVariant();
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wxVariant(const wxVariant& variant);
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wxVariant(wxVariantData* data, const wxString& name = wxEmptyString);
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#if wxUSE_ANY
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wxVariant(const wxAny& any);
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#endif
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virtual ~wxVariant();
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// generic assignment
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void operator= (const wxVariant& variant);
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// Assignment using data, e.g.
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// myVariant = new wxStringVariantData("hello");
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void operator= (wxVariantData* variantData);
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bool operator== (const wxVariant& variant) const;
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bool operator!= (const wxVariant& variant) const;
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// Sets/gets name
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inline void SetName(const wxString& name) { m_name = name; }
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inline const wxString& GetName() const { return m_name; }
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// Tests whether there is data
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bool IsNull() const;
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// For compatibility with wxWidgets <= 2.6, this doesn't increase
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// reference count.
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wxVariantData* GetData() const
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{
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return (wxVariantData*) m_refData;
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}
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void SetData(wxVariantData* data) ;
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// make a 'clone' of the object
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void Ref(const wxVariant& clone) { wxObject::Ref(clone); }
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// ensure that the data is exclusive to this variant, and not shared
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bool Unshare();
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// Make NULL (i.e. delete the data)
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void MakeNull();
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// Delete data and name
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void Clear();
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// Returns a string representing the type of the variant,
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// e.g. "string", "bool", "stringlist", "list", "double", "long"
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wxString GetType() const;
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bool IsType(const wxString& type) const;
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bool IsValueKindOf(const wxClassInfo* type) const;
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// write contents to a string (e.g. for debugging)
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wxString MakeString() const;
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#if wxUSE_ANY
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wxAny GetAny() const;
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#endif
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// double
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wxVariant(double val, const wxString& name = wxEmptyString);
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bool operator== (double value) const;
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bool operator!= (double value) const;
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void operator= (double value) ;
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inline operator double () const { return GetDouble(); }
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inline double GetReal() const { return GetDouble(); }
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double GetDouble() const;
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// long
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wxVariant(long val, const wxString& name = wxEmptyString);
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wxVariant(int val, const wxString& name = wxEmptyString);
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wxVariant(short val, const wxString& name = wxEmptyString);
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bool operator== (long value) const;
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bool operator!= (long value) const;
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void operator= (long value) ;
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inline operator long () const { return GetLong(); }
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inline long GetInteger() const { return GetLong(); }
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long GetLong() const;
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// bool
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wxVariant(bool val, const wxString& name = wxEmptyString);
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bool operator== (bool value) const;
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bool operator!= (bool value) const;
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void operator= (bool value) ;
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inline operator bool () const { return GetBool(); }
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bool GetBool() const ;
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// wxDateTime
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#if wxUSE_DATETIME
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wxVariant(const wxDateTime& val, const wxString& name = wxEmptyString);
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bool operator== (const wxDateTime& value) const;
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bool operator!= (const wxDateTime& value) const;
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void operator= (const wxDateTime& value) ;
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inline operator wxDateTime () const { return GetDateTime(); }
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wxDateTime GetDateTime() const;
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#endif
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// wxString
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wxVariant(const wxString& val, const wxString& name = wxEmptyString);
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// these overloads are necessary to prevent the compiler from using bool
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// version instead of wxString one:
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wxVariant(const char* val, const wxString& name = wxEmptyString);
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wxVariant(const wchar_t* val, const wxString& name = wxEmptyString);
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wxVariant(const wxCStrData& val, const wxString& name = wxEmptyString);
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wxVariant(const wxScopedCharBuffer& val, const wxString& name = wxEmptyString);
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wxVariant(const wxScopedWCharBuffer& val, const wxString& name = wxEmptyString);
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bool operator== (const wxString& value) const;
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bool operator!= (const wxString& value) const;
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wxVariant& operator=(const wxString& value);
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// these overloads are necessary to prevent the compiler from using bool
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// version instead of wxString one:
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wxVariant& operator=(const char* value)
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{ return *this = wxString(value); }
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wxVariant& operator=(const wchar_t* value)
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{ return *this = wxString(value); }
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wxVariant& operator=(const wxCStrData& value)
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{ return *this = value.AsString(); }
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template<typename T>
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wxVariant& operator=(const wxScopedCharTypeBuffer<T>& value)
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{ return *this = value.data(); }
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inline operator wxString () const { return MakeString(); }
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wxString GetString() const;
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#if wxUSE_STD_STRING
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wxVariant(const std::string& val, const wxString& name = wxEmptyString);
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bool operator==(const std::string& value) const
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{ return operator==(wxString(value)); }
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bool operator!=(const std::string& value) const
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{ return operator!=(wxString(value)); }
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wxVariant& operator=(const std::string& value)
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{ return operator=(wxString(value)); }
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operator std::string() const { return (operator wxString()).ToStdString(); }
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wxVariant(const wxStdWideString& val, const wxString& name = wxEmptyString);
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bool operator==(const wxStdWideString& value) const
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{ return operator==(wxString(value)); }
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bool operator!=(const wxStdWideString& value) const
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{ return operator!=(wxString(value)); }
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wxVariant& operator=(const wxStdWideString& value)
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{ return operator=(wxString(value)); }
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operator wxStdWideString() const { return (operator wxString()).ToStdWstring(); }
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#endif // wxUSE_STD_STRING
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// wxUniChar
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wxVariant(const wxUniChar& val, const wxString& name = wxEmptyString);
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wxVariant(const wxUniCharRef& val, const wxString& name = wxEmptyString);
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wxVariant(char val, const wxString& name = wxEmptyString);
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wxVariant(wchar_t val, const wxString& name = wxEmptyString);
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bool operator==(const wxUniChar& value) const;
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bool operator==(const wxUniCharRef& value) const { return *this == wxUniChar(value); }
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bool operator==(char value) const { return *this == wxUniChar(value); }
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bool operator==(wchar_t value) const { return *this == wxUniChar(value); }
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bool operator!=(const wxUniChar& value) const { return !(*this == value); }
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bool operator!=(const wxUniCharRef& value) const { return !(*this == value); }
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bool operator!=(char value) const { return !(*this == value); }
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bool operator!=(wchar_t value) const { return !(*this == value); }
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wxVariant& operator=(const wxUniChar& value);
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wxVariant& operator=(const wxUniCharRef& value) { return *this = wxUniChar(value); }
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wxVariant& operator=(char value) { return *this = wxUniChar(value); }
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wxVariant& operator=(wchar_t value) { return *this = wxUniChar(value); }
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operator wxUniChar() const { return GetChar(); }
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operator char() const { return GetChar(); }
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operator wchar_t() const { return GetChar(); }
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wxUniChar GetChar() const;
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// wxArrayString
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wxVariant(const wxArrayString& val, const wxString& name = wxEmptyString);
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bool operator== (const wxArrayString& value) const;
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bool operator!= (const wxArrayString& value) const;
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void operator= (const wxArrayString& value);
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operator wxArrayString () const { return GetArrayString(); }
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wxArrayString GetArrayString() const;
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// void*
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wxVariant(void* ptr, const wxString& name = wxEmptyString);
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bool operator== (void* value) const;
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bool operator!= (void* value) const;
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void operator= (void* value);
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operator void* () const { return GetVoidPtr(); }
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void* GetVoidPtr() const;
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// wxObject*
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wxVariant(wxObject* ptr, const wxString& name = wxEmptyString);
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bool operator== (wxObject* value) const;
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bool operator!= (wxObject* value) const;
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void operator= (wxObject* value);
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wxObject* GetWxObjectPtr() const;
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#if wxUSE_LONGLONG
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// wxLongLong
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wxVariant(wxLongLong, const wxString& name = wxEmptyString);
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bool operator==(wxLongLong value) const;
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bool operator!=(wxLongLong value) const;
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void operator=(wxLongLong value);
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operator wxLongLong() const { return GetLongLong(); }
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wxLongLong GetLongLong() const;
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// wxULongLong
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wxVariant(wxULongLong, const wxString& name = wxEmptyString);
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bool operator==(wxULongLong value) const;
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bool operator!=(wxULongLong value) const;
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void operator=(wxULongLong value);
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operator wxULongLong() const { return GetULongLong(); }
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wxULongLong GetULongLong() const;
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#endif
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// ------------------------------
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// list operations
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// ------------------------------
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wxVariant(const wxVariantList& val, const wxString& name = wxEmptyString); // List of variants
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bool operator== (const wxVariantList& value) const;
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bool operator!= (const wxVariantList& value) const;
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void operator= (const wxVariantList& value) ;
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// Treat a list variant as an array
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wxVariant operator[] (size_t idx) const;
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wxVariant& operator[] (size_t idx) ;
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wxVariantList& GetList() const ;
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// Return the number of elements in a list
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size_t GetCount() const;
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// Make empty list
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void NullList();
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// Append to list
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void Append(const wxVariant& value);
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// Insert at front of list
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void Insert(const wxVariant& value);
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// Returns true if the variant is a member of the list
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bool Member(const wxVariant& value) const;
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// Deletes the nth element of the list
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bool Delete(size_t item);
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// Clear list
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void ClearList();
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public:
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// Type conversion
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bool Convert(long* value) const;
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bool Convert(bool* value) const;
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bool Convert(double* value) const;
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bool Convert(wxString* value) const;
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bool Convert(wxUniChar* value) const;
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bool Convert(char* value) const;
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bool Convert(wchar_t* value) const;
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#if wxUSE_DATETIME
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bool Convert(wxDateTime* value) const;
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#endif // wxUSE_DATETIME
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#if wxUSE_LONGLONG
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bool Convert(wxLongLong* value) const;
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bool Convert(wxULongLong* value) const;
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#ifdef wxLongLong_t
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bool Convert(wxLongLong_t* value) const
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{
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wxLongLong temp;
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if ( !Convert(&temp) )
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return false;
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*value = temp.GetValue();
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return true;
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}
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bool Convert(wxULongLong_t* value) const
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{
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wxULongLong temp;
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if ( !Convert(&temp) )
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return false;
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*value = temp.GetValue();
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return true;
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}
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#endif // wxLongLong_t
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#endif // wxUSE_LONGLONG
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// Attributes
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protected:
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virtual wxObjectRefData *CreateRefData() const;
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virtual wxObjectRefData *CloneRefData(const wxObjectRefData *data) const;
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wxString m_name;
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private:
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DECLARE_DYNAMIC_CLASS(wxVariant)
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};
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//
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// wxVariant <-> wxAny conversion code
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//
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#if wxUSE_ANY
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#include "wx/any.h"
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// In order to convert wxAny to wxVariant, we need to be able to associate
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// wxAnyValueType with a wxVariantData factory function.
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typedef wxVariantData* (*wxVariantDataFactory)(const wxAny& any);
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// Actual Any-to-Variant registration must be postponed to a time when all
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// global variables have been initialized. Hence this arrangement.
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// wxAnyToVariantRegistration instances are kept in global scope and
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// wxAnyValueTypeGlobals in any.cpp will use their data when the time is
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// right.
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class WXDLLIMPEXP_BASE wxAnyToVariantRegistration
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{
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public:
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wxAnyToVariantRegistration(wxVariantDataFactory factory);
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virtual ~wxAnyToVariantRegistration();
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virtual wxAnyValueType* GetAssociatedType() = 0;
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wxVariantDataFactory GetFactory() const { return m_factory; }
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private:
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wxVariantDataFactory m_factory;
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};
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template<typename T>
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class wxAnyToVariantRegistrationImpl : public wxAnyToVariantRegistration
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{
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public:
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wxAnyToVariantRegistrationImpl(wxVariantDataFactory factory)
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: wxAnyToVariantRegistration(factory)
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{
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}
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virtual wxAnyValueType* GetAssociatedType()
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{
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return wxAnyValueTypeImpl<T>::GetInstance();
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}
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private:
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};
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#define DECLARE_WXANY_CONVERSION() \
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virtual bool GetAsAny(wxAny* any) const; \
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static wxVariantData* VariantDataFactory(const wxAny& any);
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#define _REGISTER_WXANY_CONVERSION(T, CLASSNAME, FUNC) \
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static wxAnyToVariantRegistrationImpl<T> \
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gs_##CLASSNAME##AnyToVariantRegistration = \
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wxAnyToVariantRegistrationImpl<T>(&FUNC);
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#define REGISTER_WXANY_CONVERSION(T, CLASSNAME) \
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_REGISTER_WXANY_CONVERSION(T, CLASSNAME, CLASSNAME::VariantDataFactory)
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#define IMPLEMENT_TRIVIAL_WXANY_CONVERSION(T, CLASSNAME) \
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bool CLASSNAME::GetAsAny(wxAny* any) const \
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{ \
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*any = m_value; \
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return true; \
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} \
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wxVariantData* CLASSNAME::VariantDataFactory(const wxAny& any) \
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{ \
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return new CLASSNAME(wxANY_AS(any, T)); \
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} \
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REGISTER_WXANY_CONVERSION(T, CLASSNAME)
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#else // if !wxUSE_ANY
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#define DECLARE_WXANY_CONVERSION()
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#define REGISTER_WXANY_CONVERSION(T, CLASSNAME)
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#define IMPLEMENT_TRIVIAL_WXANY_CONVERSION(T, CLASSNAME)
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#endif // wxUSE_ANY/!wxUSE_ANY
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#define DECLARE_VARIANT_OBJECT(classname) \
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DECLARE_VARIANT_OBJECT_EXPORTED(classname, wxEMPTY_PARAMETER_VALUE)
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#define DECLARE_VARIANT_OBJECT_EXPORTED(classname,expdecl) \
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expdecl classname& operator << ( classname &object, const wxVariant &variant ); \
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expdecl wxVariant& operator << ( wxVariant &variant, const classname &object );
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#define IMPLEMENT_VARIANT_OBJECT(classname) \
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IMPLEMENT_VARIANT_OBJECT_EXPORTED(classname, wxEMPTY_PARAMETER_VALUE)
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#define IMPLEMENT_VARIANT_OBJECT_EXPORTED_NO_EQ(classname,expdecl) \
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class classname##VariantData: public wxVariantData \
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{ \
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public:\
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classname##VariantData() {} \
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classname##VariantData( const classname &value ) { m_value = value; } \
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\
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classname &GetValue() { return m_value; } \
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\
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virtual bool Eq(wxVariantData& data) const; \
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\
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virtual wxString GetType() const; \
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virtual wxClassInfo* GetValueClassInfo(); \
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\
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virtual wxVariantData* Clone() const { return new classname##VariantData(m_value); } \
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\
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DECLARE_WXANY_CONVERSION() \
|
|
protected:\
|
|
classname m_value; \
|
|
};\
|
|
\
|
|
wxString classname##VariantData::GetType() const\
|
|
{\
|
|
return m_value.GetClassInfo()->GetClassName();\
|
|
}\
|
|
\
|
|
wxClassInfo* classname##VariantData::GetValueClassInfo()\
|
|
{\
|
|
return m_value.GetClassInfo();\
|
|
}\
|
|
\
|
|
expdecl classname& operator << ( classname &value, const wxVariant &variant )\
|
|
{\
|
|
wxASSERT( variant.GetType() == #classname );\
|
|
\
|
|
classname##VariantData *data = (classname##VariantData*) variant.GetData();\
|
|
value = data->GetValue();\
|
|
return value;\
|
|
}\
|
|
\
|
|
expdecl wxVariant& operator << ( wxVariant &variant, const classname &value )\
|
|
{\
|
|
classname##VariantData *data = new classname##VariantData( value );\
|
|
variant.SetData( data );\
|
|
return variant;\
|
|
} \
|
|
IMPLEMENT_TRIVIAL_WXANY_CONVERSION(classname, classname##VariantData)
|
|
|
|
// implements a wxVariantData-derived class using for the Eq() method the
|
|
// operator== which must have been provided by "classname"
|
|
#define IMPLEMENT_VARIANT_OBJECT_EXPORTED(classname,expdecl) \
|
|
IMPLEMENT_VARIANT_OBJECT_EXPORTED_NO_EQ(classname,wxEMPTY_PARAMETER_VALUE expdecl) \
|
|
\
|
|
bool classname##VariantData::Eq(wxVariantData& data) const \
|
|
{\
|
|
wxASSERT( GetType() == data.GetType() );\
|
|
\
|
|
classname##VariantData & otherData = (classname##VariantData &) data;\
|
|
\
|
|
return otherData.m_value == m_value;\
|
|
}\
|
|
|
|
|
|
// implements a wxVariantData-derived class using for the Eq() method a shallow
|
|
// comparison (through wxObject::IsSameAs function)
|
|
#define IMPLEMENT_VARIANT_OBJECT_SHALLOWCMP(classname) \
|
|
IMPLEMENT_VARIANT_OBJECT_EXPORTED_SHALLOWCMP(classname, wxEMPTY_PARAMETER_VALUE)
|
|
#define IMPLEMENT_VARIANT_OBJECT_EXPORTED_SHALLOWCMP(classname,expdecl) \
|
|
IMPLEMENT_VARIANT_OBJECT_EXPORTED_NO_EQ(classname,wxEMPTY_PARAMETER_VALUE expdecl) \
|
|
\
|
|
bool classname##VariantData::Eq(wxVariantData& data) const \
|
|
{\
|
|
wxASSERT( GetType() == data.GetType() );\
|
|
\
|
|
classname##VariantData & otherData = (classname##VariantData &) data;\
|
|
\
|
|
return (otherData.m_value.IsSameAs(m_value));\
|
|
}\
|
|
|
|
|
|
// Since we want type safety wxVariant we need to fetch and dynamic_cast
|
|
// in a seemingly safe way so the compiler can check, so we define
|
|
// a dynamic_cast /wxDynamicCast analogue.
|
|
|
|
#define wxGetVariantCast(var,classname) \
|
|
((classname*)(var.IsValueKindOf(&classname::ms_classInfo) ?\
|
|
var.GetWxObjectPtr() : NULL));
|
|
|
|
// Replacement for using wxDynamicCast on a wxVariantData object
|
|
#define wxDynamicCastVariantData(data, classname) dynamic_cast<classname*>(data)
|
|
|
|
extern wxVariant WXDLLIMPEXP_BASE wxNullVariant;
|
|
|
|
#endif // wxUSE_VARIANT
|
|
|
|
#endif // _WX_VARIANT_H_
|