d5d63453b1
git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@3248 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775
522 lines
22 KiB
C++
522 lines
22 KiB
C++
/////////////////////////////////////////////////////////////////////////////
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// Name: list.h
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// Purpose: wxList, wxStringList classes
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// Author: Julian Smart
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// Modified by: VZ at 16/11/98: WX_DECLARE_LIST() and typesafe lists added
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// Created: 29/01/98
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// RCS-ID: $Id$
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// Copyright: (c) 1998 Julian Smart
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// Licence: wxWindows license
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/////////////////////////////////////////////////////////////////////////////
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/*
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All this is quite ugly but serves two purposes:
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1. Be almost 100% compatible with old, untyped, wxList class
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2. Ensure compile-time type checking for the linked lists
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The idea is to have one base class (wxListBase) working with "void *" data,
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but to hide these untyped functions - i.e. make them protected, so they
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can only be used from derived classes which have inline member functions
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working with right types. This achieves the 2nd goal. As for the first one,
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we provide a special derivation of wxListBase called wxList which looks just
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like the old class.
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*/
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#ifndef _WX_LISTH__
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#define _WX_LISTH__
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#ifdef __GNUG__
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#pragma interface "list.h"
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#endif
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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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#include "wx/debug.h"
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#include "wx/object.h"
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#include "wx/string.h"
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// due to circular header dependencies this function has to be declared here
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// (normally it's found in utils.h which includes itself list.h...)
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extern WXDLLEXPORT wxChar* copystring(const wxChar *s);
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class WXDLLEXPORT wxObjectListNode;
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typedef wxObjectListNode wxNode;
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// undef it to get rid of old, deprecated functions
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#define wxLIST_COMPATIBILITY
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// -----------------------------------------------------------------------------
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// constants
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// -----------------------------------------------------------------------------
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enum wxKeyType
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{
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wxKEY_NONE,
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wxKEY_INTEGER,
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wxKEY_STRING
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};
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// -----------------------------------------------------------------------------
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// types
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// -----------------------------------------------------------------------------
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// type of compare function for list sort operation (as in 'qsort'): it should
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// return a negative value, 0 or positive value if the first element is less
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// than, equal or greater than the second
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typedef int (* LINKAGEMODE wxSortCompareFunction)(const void *elem1, const void *elem2);
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//
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typedef int (* LINKAGEMODE wxListIterateFunction)(void *current);
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// -----------------------------------------------------------------------------
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// key stuff: a list may be optionally keyed on integer or string key
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// -----------------------------------------------------------------------------
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union wxListKeyValue
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{
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long integer;
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wxChar *string;
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};
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// a struct which may contain both types of keys
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//
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// implementation note: on one hand, this class allows to have only one function
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// for any keyed operation instead of 2 almost equivalent. OTOH, it's needed to
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// resolve ambiguity which we would otherwise have with wxStringList::Find() and
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// wxList::Find(const char *).
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class WXDLLEXPORT wxListKey
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{
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public:
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// implicit ctors
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wxListKey()
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{ m_keyType = wxKEY_NONE; }
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wxListKey(long i)
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{ m_keyType = wxKEY_INTEGER; m_key.integer = i; }
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wxListKey(const wxChar *s)
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{ m_keyType = wxKEY_STRING; m_key.string = wxStrdup(s); }
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wxListKey(const wxString& s)
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{ m_keyType = wxKEY_STRING; m_key.string = wxStrdup(s.c_str()); }
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// accessors
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wxKeyType GetKeyType() const { return m_keyType; }
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const wxChar *GetString() const
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{ wxASSERT( m_keyType == wxKEY_STRING ); return m_key.string; }
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long GetNumber() const
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{ wxASSERT( m_keyType == wxKEY_INTEGER ); return m_key.integer; }
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// comparison
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// Note: implementation moved to list.cpp to prevent BC++ inline
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// expansion warning.
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bool operator==(wxListKeyValue value) const ;
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// dtor
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~wxListKey()
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{
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if ( m_keyType == wxKEY_STRING )
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free(m_key.string);
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}
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private:
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wxKeyType m_keyType;
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wxListKeyValue m_key;
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};
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// -----------------------------------------------------------------------------
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// wxNodeBase class is a (base for) node in a double linked list
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// -----------------------------------------------------------------------------
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WXDLLEXPORT_DATA(extern wxListKey) wxDefaultListKey;
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class WXDLLEXPORT wxNodeBase
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{
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friend class wxListBase;
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public:
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// ctor
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wxNodeBase(wxListBase *list = (wxListBase *)NULL,
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wxNodeBase *previous = (wxNodeBase *)NULL,
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wxNodeBase *next = (wxNodeBase *)NULL,
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void *data = NULL,
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const wxListKey& key = wxDefaultListKey);
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virtual ~wxNodeBase();
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// FIXME no check is done that the list is really keyed on strings
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const wxChar *GetKeyString() const { return m_key.string; }
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long GetKeyInteger() const { return m_key.integer; }
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// Necessary for some existing code
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void SetKeyString(wxChar* s) { m_key.string = s; }
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void SetKeyInteger(long i) { m_key.integer = i; }
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#ifdef wxLIST_COMPATIBILITY
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// compatibility methods
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wxNode *Next() const { return (wxNode *)GetNext(); }
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wxNode *Previous() const { return (wxNode *)GetPrevious(); }
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wxObject *Data() const { return (wxObject *)GetData(); }
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#endif // wxLIST_COMPATIBILITY
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protected:
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// all these are going to be "overloaded" in the derived classes
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wxNodeBase *GetNext() const { return m_next; }
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wxNodeBase *GetPrevious() const { return m_previous; }
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void *GetData() const { return m_data; }
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void SetData(void *data) { m_data = data; }
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// get 0-based index of this node within the list or wxNOT_FOUND
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int IndexOf() const;
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virtual void DeleteData() { }
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private:
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// optional key stuff
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wxListKeyValue m_key;
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void *m_data; // user data
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wxNodeBase *m_next, // next and previous nodes in the list
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*m_previous;
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wxListBase *m_list; // list we belong to
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};
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// -----------------------------------------------------------------------------
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// a double-linked list class
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// -----------------------------------------------------------------------------
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class WXDLLEXPORT wxListBase : public wxObject
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{
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friend class wxNodeBase; // should be able to call DetachNode()
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public:
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// default ctor & dtor
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wxListBase(wxKeyType keyType = wxKEY_NONE) { Init(keyType); }
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virtual ~wxListBase();
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// accessors
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// count of items in the list
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size_t GetCount() const { return m_count; }
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// operations
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// delete all nodes
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void Clear();
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// instruct it to destroy user data when deleting nodes
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void DeleteContents(bool destroy) { m_destroy = destroy; }
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// query if to delete
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bool GetDeleteContents() const
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{ return m_destroy; }
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// get the keytype
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wxKeyType GetKeyType() const
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{ return m_keyType; }
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// set the keytype (required by the serial code)
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void SetKeyType(wxKeyType keyType)
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{ wxASSERT( m_count==0 ); m_keyType = keyType; }
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#ifdef wxLIST_COMPATIBILITY
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int Number() const { return GetCount(); }
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wxNode *First() const { return (wxNode *)GetFirst(); }
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wxNode *Last() const { return (wxNode *)GetLast(); }
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wxNode *Nth(size_t index) const { return (wxNode *)Item(index); }
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#endif // wxLIST_COMPATIBILITY
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protected:
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// all methods here are "overloaded" in derived classes to provide compile
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// time type checking
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// create a node for the list of this type
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virtual wxNodeBase *CreateNode(wxNodeBase *prev, wxNodeBase *next,
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void *data,
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const wxListKey& key = wxDefaultListKey) = 0;
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// Can't access these from derived classes otherwise (bug in Salford C++?)
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#ifdef __SALFORDC__
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public:
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#endif
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// ctors
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// from an array
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wxListBase(size_t count, void *elements[]);
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// from a sequence of objects
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wxListBase(void *object, ... /* terminate with NULL */);
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protected:
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// copy ctor and assignment operator
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wxListBase(const wxListBase& list)
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{ DoCopy(list); }
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wxListBase& operator=(const wxListBase& list)
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{ Clear(); DoCopy(list); return *this; }
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// get list head/tail
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wxNodeBase *GetFirst() const { return m_nodeFirst; }
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wxNodeBase *GetLast() const { return m_nodeLast; }
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// by (0-based) index
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wxNodeBase *Item(size_t index) const;
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// get the list item's data
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void *operator[](size_t index) const
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{ wxNodeBase *node = Item(index); return node ? node->GetData() : (wxNodeBase*)NULL; }
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// operations
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// append to end of list
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wxNodeBase *Append(void *object);
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// insert a new item at the beginning of the list
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wxNodeBase *Insert(void *object) { return Insert( (wxNodeBase*)NULL, object); }
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// insert before given node or at front of list if prev == NULL
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wxNodeBase *Insert(wxNodeBase *prev, void *object);
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// keyed append
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wxNodeBase *Append(long key, void *object);
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wxNodeBase *Append(const wxChar *key, void *object);
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// removes node from the list but doesn't delete it (returns pointer
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// to the node or NULL if it wasn't found in the list)
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wxNodeBase *DetachNode(wxNodeBase *node);
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// delete element from list, returns FALSE if node not found
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bool DeleteNode(wxNodeBase *node);
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// finds object pointer and deletes node (and object if DeleteContents
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// is on), returns FALSE if object not found
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bool DeleteObject(void *object);
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// search (all return NULL if item not found)
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// by data
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wxNodeBase *Find(void *object) const;
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// by key
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wxNodeBase *Find(const wxListKey& key) const;
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// get 0-based index of object or wxNOT_FOUND
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int IndexOf( void *object ) const;
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// this function allows the sorting of arbitrary lists by giving
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// a function to compare two list elements. The list is sorted in place.
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void Sort(const wxSortCompareFunction compfunc);
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// functions for iterating over the list
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void *FirstThat(wxListIterateFunction func);
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void ForEach(wxListIterateFunction func);
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void *LastThat(wxListIterateFunction func);
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private:
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// helpers
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// common part of all ctors
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void Init(wxKeyType keyType = wxKEY_NONE);
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// common part of copy ctor and assignment operator
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void DoCopy(const wxListBase& list);
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// common part of all Append()s
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wxNodeBase *AppendCommon(wxNodeBase *node);
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// free node's data and node itself
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void DoDeleteNode(wxNodeBase *node);
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size_t m_count; // number of elements in the list
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bool m_destroy; // destroy user data when deleting list items?
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wxNodeBase *m_nodeFirst, // pointers to the head and tail of the list
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*m_nodeLast;
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wxKeyType m_keyType; // type of our keys (may be wxKEY_NONE)
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};
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// -----------------------------------------------------------------------------
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// macros for definition of "template" list type
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// -----------------------------------------------------------------------------
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// and now some heavy magic...
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// declare a list type named 'name' and containing elements of type 'T *'
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// (as a by product of macro expansion you also get wx##name##Node
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// wxNode-derived type)
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//
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// implementation details:
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// 1. We define _WX_LIST_ITEM_TYPE_##name typedef to save in it the item type
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// for the list of given type - this allows us to pass only the list name
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// to WX_DEFINE_LIST() even if it needs both the name and the type
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//
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// 2. We redefine all non-type-safe wxList functions with type-safe versions
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// which don't take any space (everything is inline), but bring compile
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// time error checking.
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//
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// 3. The macro which is usually used (WX_DECLARE_LIST) is defined in terms of
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// a more generic WX_DECLARE_LIST_2 macro which, in turn, uses the most
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// generic WX_DECLARE_LIST_3 one. The last macro adds a sometimes
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// interesting capability to store polymorphic objects in the list and is
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// particularly useful with, for example, "wxWindow *" list where the
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// wxWindowBase pointers are put into the list, but wxWindow pointers are
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// retrieved from it.
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#define WX_DECLARE_LIST_3(T, Tbase, name, nodetype) \
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typedef int (*wxSortFuncFor_##name)(const T **, const T **); \
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\
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class WXDLLEXPORT nodetype : public wxNodeBase \
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{ \
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public: \
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nodetype(wxListBase *list = (wxListBase *)NULL, \
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nodetype *previous = (nodetype *)NULL, \
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nodetype *next = (nodetype *)NULL, \
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T *data = (T *)NULL, \
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const wxListKey& key = wxDefaultListKey) \
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: wxNodeBase(list, previous, next, data, key) { } \
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\
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nodetype *GetNext() const \
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{ return (nodetype *)wxNodeBase::GetNext(); } \
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nodetype *GetPrevious() const \
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{ return (nodetype *)wxNodeBase::GetPrevious(); } \
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\
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T *GetData() const \
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{ return (T *)wxNodeBase::GetData(); } \
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void SetData(T *data) \
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{ wxNodeBase::SetData(data); } \
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\
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virtual void DeleteData(); \
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}; \
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\
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class WXDLLEXPORT name : public wxListBase \
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{ \
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public: \
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typedef nodetype Node; \
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\
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name(wxKeyType keyType = wxKEY_NONE) : wxListBase(keyType) \
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{ } \
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name(size_t count, T *elements[]) \
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: wxListBase(count, (void **)elements) { } \
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\
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nodetype *GetFirst() const \
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{ return (nodetype *)wxListBase::GetFirst(); } \
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nodetype *GetLast() const \
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{ return (nodetype *)wxListBase::GetLast(); } \
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\
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nodetype *Item(size_t index) const \
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{ return (nodetype *)wxListBase::Item(index); } \
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\
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T *operator[](size_t index) const \
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{ \
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nodetype *node = Item(index); \
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return node ? (T*)(node->GetData()) : (T*)NULL; \
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} \
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\
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nodetype *Append(Tbase *object) \
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{ return (nodetype *)wxListBase::Append(object); } \
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nodetype *Insert(Tbase *object) \
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{ return (nodetype *)Insert((nodetype*)NULL, object); } \
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nodetype *Insert(nodetype *prev, Tbase *object) \
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{ return (nodetype *)wxListBase::Insert(prev, object); } \
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\
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nodetype *Append(long key, void *object) \
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{ return (nodetype *)wxListBase::Append(key, object); } \
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nodetype *Append(const wxChar *key, void *object) \
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{ return (nodetype *)wxListBase::Append(key, object); } \
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\
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nodetype *DetachNode(nodetype *node) \
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{ return (nodetype *)wxListBase::DetachNode(node); } \
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bool DeleteNode(nodetype *node) \
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{ return wxListBase::DeleteNode(node); } \
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bool DeleteObject(Tbase *object) \
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{ return wxListBase::DeleteObject(object); } \
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\
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nodetype *Find(Tbase *object) const \
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{ return (nodetype *)wxListBase::Find(object); } \
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\
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virtual nodetype *Find(const wxListKey& key) const \
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{ return (nodetype *)wxListBase::Find(key); } \
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\
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int IndexOf(Tbase *object) const \
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{ return wxListBase::IndexOf(object); } \
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\
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void Sort(wxSortFuncFor_##name func) \
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{ wxListBase::Sort((wxSortCompareFunction)func); } \
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\
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protected: \
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wxNodeBase *CreateNode(wxNodeBase *prev, wxNodeBase *next, \
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void *data, \
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const wxListKey& key = wxDefaultListKey) \
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{ \
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return new nodetype(this, \
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(nodetype *)prev, (nodetype *)next, \
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(T *)data, key); \
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} \
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}
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#define WX_DECLARE_LIST_2(elementtype, listname, nodename) \
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WX_DECLARE_LIST_3(elementtype, elementtype, listname, nodename)
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#define WX_DECLARE_LIST(elementtype, listname) \
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typedef elementtype _WX_LIST_ITEM_TYPE_##listname; \
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WX_DECLARE_LIST_2(elementtype, listname, wx##listname##Node)
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// this macro must be inserted in your program after
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// #include <wx/listimpl.cpp>
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#define WX_DEFINE_LIST(name) "don't forget to include listimpl.cpp!"
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// =============================================================================
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// now we can define classes 100% compatible with the old ones
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// =============================================================================
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// ----------------------------------------------------------------------------
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// commonly used list classes
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// ----------------------------------------------------------------------------
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#ifdef wxLIST_COMPATIBILITY
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// -----------------------------------------------------------------------------
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// wxList compatibility class: in fact, it's a list of wxObjects
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// -----------------------------------------------------------------------------
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WX_DECLARE_LIST_2(wxObject, wxObjectList, wxObjectListNode);
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class WXDLLEXPORT wxList : public wxObjectList
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{
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public:
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wxList(int key_type = wxKEY_NONE) : wxObjectList((wxKeyType)key_type) { }
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// compatibility methods
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void Sort(wxSortCompareFunction compfunc) { wxListBase::Sort(compfunc); }
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wxNode *Member(wxObject *object) const { return (wxNode *)Find(object); }
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};
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// -----------------------------------------------------------------------------
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// wxStringList class for compatibility with the old code
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// -----------------------------------------------------------------------------
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WX_DECLARE_LIST_2(wxChar, wxStringListBase, wxStringListNode);
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class WXDLLEXPORT wxStringList : public wxStringListBase
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{
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public:
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// ctors and such
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// default
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wxStringList() { DeleteContents(TRUE); }
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wxStringList(const wxChar *first ...);
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// copying the string list: the strings are copied, too (extremely
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// inefficient!)
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wxStringList(const wxStringList& other) { DoCopy(other); }
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wxStringList& operator=(const wxStringList& other)
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{ Clear(); DoCopy(other); return *this; }
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// operations
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// makes a copy of the string
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wxNode *Add(const wxChar *s)
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{ return (wxNode *)wxStringListBase::Append(copystring(s)); }
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bool Delete(const wxChar *s);
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wxChar **ListToArray(bool new_copies = FALSE) const;
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bool Member(const wxChar *s) const;
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// alphabetic sort
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void Sort();
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private:
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void DoCopy(const wxStringList&); // common part of copy ctor and operator=
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};
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#endif // wxLIST_COMPATIBILITY
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#endif
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// _WX_LISTH__
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