X-Git-Url: https://git.saurik.com/wxWidgets.git/blobdiff_plain/8fdca65cf20ae4dba861fa6667d6e233cbb900cf..d45d30c8682f858321600e2958167d7ef54ebeb5:/include/wx/list.h diff --git a/include/wx/list.h b/include/wx/list.h index 61466cd3aa..4960930946 100644 --- a/include/wx/list.h +++ b/include/wx/list.h @@ -2,13 +2,26 @@ // Name: list.h // Purpose: wxList, wxStringList classes // Author: Julian Smart -// Modified by: +// Modified by: VZ at 16/11/98: WX_DECLARE_LIST() and typesafe lists added // Created: 29/01/98 // RCS-ID: $Id$ // Copyright: (c) 1998 Julian Smart -// Licence: wxWindows license +// Licence: wxWindows license ///////////////////////////////////////////////////////////////////////////// +/* + All this is quite ugly but serves two purposes: + 1. Be almost 100% compatible with old, untyped, wxList class + 2. Ensure compile-time type checking for the linked lists + + The idea is to have one base class (wxListBase) working with "void *" data, + but to hide these untyped functions - i.e. make them protected, so they + can only be used from derived classes which have inline member functions + working with right types. This achieves the 2nd goal. As for the first one, + we provide a special derivation of wxListBase called wxList which looks just + like the old class. +*/ + #ifndef _WX_LISTH__ #define _WX_LISTH__ @@ -16,133 +29,493 @@ #pragma interface "list.h" #endif +// ----------------------------------------------------------------------------- +// headers +// ----------------------------------------------------------------------------- + #include "wx/defs.h" +#include "wx/debug.h" #include "wx/object.h" +#include "wx/string.h" + +// due to circular header dependencies this function has to be declared here +// (normally it's found in utils.h which includes itself list.h...) +extern WXDLLEXPORT wxChar* copystring(const wxChar *s); + +class WXDLLEXPORT wxObjectListNode; +typedef wxObjectListNode wxNode; + +// undef it to get rid of old, deprecated functions +#define wxLIST_COMPATIBILITY + +// ----------------------------------------------------------------------------- +// constants +// ----------------------------------------------------------------------------- +enum wxKeyType +{ + wxKEY_NONE, + wxKEY_INTEGER, + wxKEY_STRING +}; + +// ----------------------------------------------------------------------------- +// types +// ----------------------------------------------------------------------------- + +// type of compare function for list sort operation (as in 'qsort'): it should +// return a negative value, 0 or positive value if the first element is less +// than, equal or greater than the second +typedef int (* LINKAGEMODE wxSortCompareFunction)(const void *elem1, const void *elem2); + +// +typedef int (* LINKAGEMODE wxListIterateFunction)(void *current); -class WXDLLEXPORT wxList; +// ----------------------------------------------------------------------------- +// key stuff: a list may be optionally keyed on integer or string key +// ----------------------------------------------------------------------------- -#define wxKEY_NONE 0 -#define wxKEY_INTEGER 1 -#define wxKEY_STRING 2 -class WXDLLEXPORT wxNode: public wxObject +union wxListKeyValue { - DECLARE_DYNAMIC_CLASS(wxNode) - private: - - wxObject *data; - wxNode *next; - wxNode *previous; - - public: - wxList *list; - - // Optional key stuff - union - { long integer; - char *string; - } key; - - wxNode(wxList *the_list = (wxList *) NULL, wxNode *last_one = (wxNode *) NULL, wxNode *next_one = (wxNode *) NULL, wxObject *object = (wxObject *) NULL); - wxNode(wxList *the_list, wxNode *last_one, wxNode *next_one, - wxObject *object, long the_key); - wxNode(wxList *the_list, wxNode *last_one, wxNode *next_one, - wxObject *object, const char *the_key); - ~wxNode(void); - - inline wxNode *Next(void) const { return next; } - inline wxNode *Previous(void) const { return previous; } - inline wxObject *Data(void) const { return (wxObject *)data; } - inline void SetData(wxObject *the_data) { data = the_data; } + wxChar *string; }; -// type of compare function for list sort operation (as in 'qsort') -typedef int (*wxSortCompareFunction)(const void *elem1, const void *elem2); -typedef int (*wxListIterateFunction)(wxObject *o); +// a struct which may contain both types of keys +// +// implementation note: on one hand, this class allows to have only one function +// for any keyed operation instead of 2 almost equivalent. OTOH, it's needed to +// resolve ambiguity which we would otherwise have with wxStringList::Find() and +// wxList::Find(const char *). +class WXDLLEXPORT wxListKey +{ +public: + // implicit ctors + wxListKey() + { m_keyType = wxKEY_NONE; } + wxListKey(long i) + { m_keyType = wxKEY_INTEGER; m_key.integer = i; } + wxListKey(const wxChar *s) + { m_keyType = wxKEY_STRING; m_key.string = wxStrdup(s); } + wxListKey(const wxString& s) + { m_keyType = wxKEY_STRING; m_key.string = wxStrdup(s.c_str()); } + + // accessors + wxKeyType GetKeyType() const { return m_keyType; } + const wxChar *GetString() const + { wxASSERT( m_keyType == wxKEY_STRING ); return m_key.string; } + long GetNumber() const + { wxASSERT( m_keyType == wxKEY_INTEGER ); return m_key.integer; } + + // comparison + // Note: implementation moved to list.cpp to prevent BC++ inline + // expansion warning. + bool operator==(wxListKeyValue value) const ; + + // dtor + ~wxListKey() + { + if ( m_keyType == wxKEY_STRING ) + free(m_key.string); + } + +private: + wxKeyType m_keyType; + wxListKeyValue m_key; +}; -class WXDLLEXPORT wxList: public wxObject +// ----------------------------------------------------------------------------- +// wxNodeBase class is a (base for) node in a double linked list +// ----------------------------------------------------------------------------- + +WXDLLEXPORT_DATA(extern wxListKey) wxDefaultListKey; + +class WXDLLEXPORT wxNodeBase { - DECLARE_DYNAMIC_CLASS(wxList) - - public: - int n; - int destroy_data; - wxNode *first_node; - wxNode *last_node; - unsigned int key_type; - - wxList(void); - wxList(const unsigned int the_key_type); - wxList(int N, wxObject *Objects[]); - wxList(wxObject *object, ...); - - ~wxList(void); - - inline int Number(void) const { return n; } - inline int GetCount(void) const { return n; } - - // Append to end of list - wxNode *Append(wxObject *object); - - // Insert at front of list - wxNode *Insert(wxObject *object); - - // Insert before given node - wxNode *Insert(wxNode *position, wxObject *object); - - // Keyed append - wxNode *Append(long key, wxObject *object); - wxNode *Append(const char *key, wxObject *object); - - bool DeleteNode(wxNode *node); - bool DeleteObject(wxObject *object); // Finds object pointer and - // deletes node (and object if - // DeleteContents is on) - virtual void Clear(void); // Delete all nodes - - inline wxNode *First(void) const { return first_node; } - inline wxNode *Last(void) const { return last_node; } - wxNode *Nth(int i) const; // nth node counting from 0 - - // Keyed search - virtual wxNode *Find(long key) const; - virtual wxNode *Find(const char *key) const; - - virtual wxNode *Member(wxObject *object) const; - - inline void DeleteContents(int destroy) { destroy_data = destroy; } - // Instruct it to destroy user data - // when deleting nodes - // this function allows the sorting of arbitrary lists by giving - // a function to compare two list elements. - void Sort(const wxSortCompareFunction compfunc); - - wxObject *FirstThat(wxListIterateFunction func); - void ForEach(wxListIterateFunction func); - wxObject *LastThat(wxListIterateFunction func); +friend class wxListBase; +public: + // ctor + wxNodeBase(wxListBase *list = (wxListBase *)NULL, + wxNodeBase *previous = (wxNodeBase *)NULL, + wxNodeBase *next = (wxNodeBase *)NULL, + void *data = NULL, + const wxListKey& key = wxDefaultListKey); + + virtual ~wxNodeBase(); + + // FIXME no check is done that the list is really keyed on strings + const wxChar *GetKeyString() const { return m_key.string; } + long GetKeyInteger() const { return m_key.integer; } + + // Necessary for some existing code + void SetKeyString(wxChar* s) { m_key.string = s; } + void SetKeyInteger(long i) { m_key.integer = i; } + +#ifdef wxLIST_COMPATIBILITY + // compatibility methods + wxNode *Next() const { return (wxNode *)GetNext(); } + wxNode *Previous() const { return (wxNode *)GetPrevious(); } + wxObject *Data() const { return (wxObject *)GetData(); } +#endif // wxLIST_COMPATIBILITY + +protected: + // all these are going to be "overloaded" in the derived classes + wxNodeBase *GetNext() const { return m_next; } + wxNodeBase *GetPrevious() const { return m_previous; } + + void *GetData() const { return m_data; } + void SetData(void *data) { m_data = data; } + + // get 0-based index of this node within the list or wxNOT_FOUND + int IndexOf() const; + + virtual void DeleteData() { } + +private: + // optional key stuff + wxListKeyValue m_key; + + void *m_data; // user data + wxNodeBase *m_next, // next and previous nodes in the list + *m_previous; + + wxListBase *m_list; // list we belong to }; -// String list class. N.B. this always copies strings -// with Add and deletes them itself. -class WXDLLEXPORT wxStringList: public wxList +// ----------------------------------------------------------------------------- +// a double-linked list class +// ----------------------------------------------------------------------------- +class WXDLLEXPORT wxListBase : public wxObject { - DECLARE_DYNAMIC_CLASS(wxStringList) - - public: - wxStringList(void); - wxStringList(const wxStringList& list); - wxStringList(const char *first ...); - ~wxStringList(void); - - virtual wxNode *Add(const char *s); - virtual void Delete(const char *s); - virtual char **ListToArray(bool new_copies = FALSE) const; - virtual void Sort(void); - virtual bool Member(const char *s) const; - virtual void Clear(void); - void operator= (const wxStringList& list); - char* operator[] (int i) const; +friend class wxNodeBase; // should be able to call DetachNode() +public: + // default ctor & dtor + wxListBase(wxKeyType keyType = wxKEY_NONE) { Init(keyType); } + virtual ~wxListBase(); + + // accessors + // count of items in the list + size_t GetCount() const { return m_count; } + + // operations + + // delete all nodes + void Clear(); + + // instruct it to destroy user data when deleting nodes + void DeleteContents(bool destroy) { m_destroy = destroy; } + + // query if to delete + bool GetDeleteContents() const + { return m_destroy; } + + // get the keytype + wxKeyType GetKeyType() const + { return m_keyType; } + + // set the keytype (required by the serial code) + void SetKeyType(wxKeyType keyType) + { wxASSERT( m_count==0 ); m_keyType = keyType; } + +#ifdef wxLIST_COMPATIBILITY + int Number() const { return GetCount(); } + wxNode *First() const { return (wxNode *)GetFirst(); } + wxNode *Last() const { return (wxNode *)GetLast(); } + wxNode *Nth(size_t index) const { return (wxNode *)Item(index); } +#endif // wxLIST_COMPATIBILITY + +protected: + + // all methods here are "overloaded" in derived classes to provide compile + // time type checking + + // create a node for the list of this type + virtual wxNodeBase *CreateNode(wxNodeBase *prev, wxNodeBase *next, + void *data, + const wxListKey& key = wxDefaultListKey) = 0; + +// Can't access these from derived classes otherwise (bug in Salford C++?) +#ifdef __SALFORDC__ +public: +#endif + + // ctors + // from an array + wxListBase(size_t count, void *elements[]); + // from a sequence of objects + wxListBase(void *object, ... /* terminate with NULL */); + +protected: + // copy ctor and assignment operator + wxListBase(const wxListBase& list) + { DoCopy(list); } + wxListBase& operator=(const wxListBase& list) + { Clear(); DoCopy(list); return *this; } + + // get list head/tail + wxNodeBase *GetFirst() const { return m_nodeFirst; } + wxNodeBase *GetLast() const { return m_nodeLast; } + + // by (0-based) index + wxNodeBase *Item(size_t index) const; + + // get the list item's data + void *operator[](size_t index) const + { wxNodeBase *node = Item(index); return node ? node->GetData() : (wxNodeBase*)NULL; } + + // operations + // append to end of list + wxNodeBase *Append(void *object); + // insert a new item at the beginning of the list + wxNodeBase *Insert(void *object) { return Insert( (wxNodeBase*)NULL, object); } + // insert before given node or at front of list if prev == NULL + wxNodeBase *Insert(wxNodeBase *prev, void *object); + + // keyed append + wxNodeBase *Append(long key, void *object); + wxNodeBase *Append(const wxChar *key, void *object); + + // removes node from the list but doesn't delete it (returns pointer + // to the node or NULL if it wasn't found in the list) + wxNodeBase *DetachNode(wxNodeBase *node); + // delete element from list, returns FALSE if node not found + bool DeleteNode(wxNodeBase *node); + // finds object pointer and deletes node (and object if DeleteContents + // is on), returns FALSE if object not found + bool DeleteObject(void *object); + + // search (all return NULL if item not found) + // by data + wxNodeBase *Find(void *object) const; + + // by key + wxNodeBase *Find(const wxListKey& key) const; + + // get 0-based index of object or wxNOT_FOUND + int IndexOf( void *object ) const; + + // this function allows the sorting of arbitrary lists by giving + // a function to compare two list elements. The list is sorted in place. + void Sort(const wxSortCompareFunction compfunc); + + // functions for iterating over the list + void *FirstThat(wxListIterateFunction func); + void ForEach(wxListIterateFunction func); + void *LastThat(wxListIterateFunction func); + +private: + // helpers + // common part of all ctors + void Init(wxKeyType keyType = wxKEY_NONE); + // common part of copy ctor and assignment operator + void DoCopy(const wxListBase& list); + // common part of all Append()s + wxNodeBase *AppendCommon(wxNodeBase *node); + // free node's data and node itself + void DoDeleteNode(wxNodeBase *node); + + size_t m_count; // number of elements in the list + bool m_destroy; // destroy user data when deleting list items? + wxNodeBase *m_nodeFirst, // pointers to the head and tail of the list + *m_nodeLast; + + wxKeyType m_keyType; // type of our keys (may be wxKEY_NONE) +}; + +// ----------------------------------------------------------------------------- +// macros for definition of "template" list type +// ----------------------------------------------------------------------------- + +// and now some heavy magic... + +// declare a list type named 'name' and containing elements of type 'T *' +// (as a by product of macro expansion you also get wx##name##Node +// wxNode-derived type) +// +// implementation details: +// 1. We define _WX_LIST_ITEM_TYPE_##name typedef to save in it the item type +// for the list of given type - this allows us to pass only the list name +// to WX_DEFINE_LIST() even if it needs both the name and the type +// +// 2. We redefine all non-type-safe wxList functions with type-safe versions +// which don't take any space (everything is inline), but bring compile +// time error checking. +// +// 3. The macro which is usually used (WX_DECLARE_LIST) is defined in terms of +// a more generic WX_DECLARE_LIST_2 macro which, in turn, uses the most +// generic WX_DECLARE_LIST_3 one. The last macro adds a sometimes +// interesting capability to store polymorphic objects in the list and is +// particularly useful with, for example, "wxWindow *" list where the +// wxWindowBase pointers are put into the list, but wxWindow pointers are +// retrieved from it. + +#define WX_DECLARE_LIST_3(T, Tbase, name, nodetype) \ + typedef int (*wxSortFuncFor_##name)(const T **, const T **); \ + \ + class WXDLLEXPORT nodetype : public wxNodeBase \ + { \ + public: \ + nodetype(wxListBase *list = (wxListBase *)NULL, \ + nodetype *previous = (nodetype *)NULL, \ + nodetype *next = (nodetype *)NULL, \ + T *data = (T *)NULL, \ + const wxListKey& key = wxDefaultListKey) \ + : wxNodeBase(list, previous, next, data, key) { } \ + \ + nodetype *GetNext() const \ + { return (nodetype *)wxNodeBase::GetNext(); } \ + nodetype *GetPrevious() const \ + { return (nodetype *)wxNodeBase::GetPrevious(); } \ + \ + T *GetData() const \ + { return (T *)wxNodeBase::GetData(); } \ + void SetData(T *data) \ + { wxNodeBase::SetData(data); } \ + \ + virtual void DeleteData(); \ + }; \ + \ + class WXDLLEXPORT name : public wxListBase \ + { \ + public: \ + typedef nodetype Node; \ + \ + name(wxKeyType keyType = wxKEY_NONE) : wxListBase(keyType) \ + { } \ + name(size_t count, T *elements[]) \ + : wxListBase(count, (void **)elements) { } \ + \ + nodetype *GetFirst() const \ + { return (nodetype *)wxListBase::GetFirst(); } \ + nodetype *GetLast() const \ + { return (nodetype *)wxListBase::GetLast(); } \ + \ + nodetype *Item(size_t index) const \ + { return (nodetype *)wxListBase::Item(index); } \ + \ + T *operator[](size_t index) const \ + { \ + nodetype *node = Item(index); \ + return node ? (T*)(node->GetData()) : (T*)NULL; \ + } \ + \ + nodetype *Append(Tbase *object) \ + { return (nodetype *)wxListBase::Append(object); } \ + nodetype *Insert(Tbase *object) \ + { return (nodetype *)Insert((nodetype*)NULL, object); } \ + nodetype *Insert(nodetype *prev, Tbase *object) \ + { return (nodetype *)wxListBase::Insert(prev, object); } \ + \ + nodetype *Append(long key, void *object) \ + { return (nodetype *)wxListBase::Append(key, object); } \ + nodetype *Append(const wxChar *key, void *object) \ + { return (nodetype *)wxListBase::Append(key, object); } \ + \ + nodetype *DetachNode(nodetype *node) \ + { return (nodetype *)wxListBase::DetachNode(node); } \ + bool DeleteNode(nodetype *node) \ + { return wxListBase::DeleteNode(node); } \ + bool DeleteObject(Tbase *object) \ + { return wxListBase::DeleteObject(object); } \ + \ + nodetype *Find(Tbase *object) const \ + { return (nodetype *)wxListBase::Find(object); } \ + \ + virtual nodetype *Find(const wxListKey& key) const \ + { return (nodetype *)wxListBase::Find(key); } \ + \ + int IndexOf(Tbase *object) const \ + { return wxListBase::IndexOf(object); } \ + \ + void Sort(wxSortFuncFor_##name func) \ + { wxListBase::Sort((wxSortCompareFunction)func); } \ + \ + protected: \ + wxNodeBase *CreateNode(wxNodeBase *prev, wxNodeBase *next, \ + void *data, \ + const wxListKey& key = wxDefaultListKey) \ + { \ + return new nodetype(this, \ + (nodetype *)prev, (nodetype *)next, \ + (T *)data, key); \ + } \ + } + +#define WX_DECLARE_LIST_2(elementtype, listname, nodename) \ + WX_DECLARE_LIST_3(elementtype, elementtype, listname, nodename) + +#define WX_DECLARE_LIST(elementtype, listname) \ + typedef elementtype _WX_LIST_ITEM_TYPE_##listname; \ + WX_DECLARE_LIST_2(elementtype, listname, wx##listname##Node) + +// this macro must be inserted in your program after +// #include +#define WX_DEFINE_LIST(name) "don't forget to include listimpl.cpp!" + +// ============================================================================= +// now we can define classes 100% compatible with the old ones +// ============================================================================= + +// ---------------------------------------------------------------------------- +// commonly used list classes +// ---------------------------------------------------------------------------- + +#ifdef wxLIST_COMPATIBILITY + +// ----------------------------------------------------------------------------- +// wxList compatibility class: in fact, it's a list of wxObjects +// ----------------------------------------------------------------------------- + +WX_DECLARE_LIST_2(wxObject, wxObjectList, wxObjectListNode); + +class WXDLLEXPORT wxList : public wxObjectList +{ +public: + wxList(int key_type = wxKEY_NONE) : wxObjectList((wxKeyType)key_type) { } + + // compatibility methods + void Sort(wxSortCompareFunction compfunc) { wxListBase::Sort(compfunc); } + + wxNode *Member(wxObject *object) const { return (wxNode *)Find(object); } +}; + +// ----------------------------------------------------------------------------- +// wxStringList class for compatibility with the old code +// ----------------------------------------------------------------------------- + +WX_DECLARE_LIST_2(wxChar, wxStringListBase, wxStringListNode); + +class WXDLLEXPORT wxStringList : public wxStringListBase +{ +public: + // ctors and such + // default + wxStringList() { DeleteContents(TRUE); } + wxStringList(const wxChar *first ...); + + // copying the string list: the strings are copied, too (extremely + // inefficient!) + wxStringList(const wxStringList& other) { DoCopy(other); } + wxStringList& operator=(const wxStringList& other) + { Clear(); DoCopy(other); return *this; } + + // operations + // makes a copy of the string + wxNode *Add(const wxChar *s) + { return (wxNode *)wxStringListBase::Append(copystring(s)); } + + bool Delete(const wxChar *s); + + wxChar **ListToArray(bool new_copies = FALSE) const; + bool Member(const wxChar *s) const; + + // alphabetic sort + void Sort(); + +private: + void DoCopy(const wxStringList&); // common part of copy ctor and operator= }; +#endif // wxLIST_COMPATIBILITY + #endif // _WX_LISTH__