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[wxWidgets.git] / docs / latex / wx / list.tex

\section{\class{wxList}}\label{wxlist}

This class provides linked list functionality for wxWindows, and for an application
if it wishes.  Depending on the form of constructor used, a list can be keyed on
integer or string keys to provide a primitive look-up ability. See \helpref{wxHashTable}{wxhashtable}\rtfsp
for a faster method of storage when random access is required.

\wxheading{Derived from}

\helpref{wxObject}{wxobject}

\wxheading{Example}

It is very common to iterate on a list as follows:

\begin{verbatim}
  ...
  wxPoint *point1 = new wxPoint(100, 100);
  wxPoint *point2 = new wxPoint(200, 200);

  wxList SomeList;
  SomeList.Append(point1);
  SomeList.Append(point2);

  ...

  wxNode *node = SomeList.First();
  while (node)
  {
    wxPoint *point = (wxPoint *)node->Data();
    ...
    node = node->Next();
  }
\end{verbatim}

To delete nodes in a list as the list is being traversed, replace

\begin{verbatim}
    ...
    node = node->Next();
    ...
\end{verbatim}

with

\begin{verbatim}
    ...
    delete point;
    delete node;
    node = SomeList.First();
    ...
\end{verbatim}

See \helpref{wxNode}{wxnode} for members that retrieve the data associated with a node, and
members for getting to the next or previous node.

Note that a cast is required when retrieving the data from a node.  Although a
node is defined to store objects of type {\bf wxObject} and derived types, other
types (such as char*) may be used with appropriate casting.

\wxheading{See also}

\helpref{wxNode}{wxnode}, \helpref{wxStringList}{wxstringlist}

\latexignore{\rtfignore{\wxheading{Members}}}


\membersection{wxList::wxList}

\func{}{wxList}{\void}

\func{}{wxList}{\param{unsigned int}{ key\_type}}

\func{}{wxList}{\param{int}{ n}, \param{wxObject *}{objects[]}}

\func{}{wxList}{\param{wxObject *}{object}, ...}

Constructors. {\it key\_type} is one of wxKEY\_NONE, wxKEY\_INTEGER, or wxKEY\_STRING,
and indicates what sort of keying is required (if any).

{\it objects} is an array of {\it n} objects with which to initialize the list.

The variable-length argument list constructor must be supplied with a
terminating NULL.

\membersection{wxList::\destruct{wxList}}

\func{}{\destruct{wxList}}{\void}

Destroys the list.  Also destroys any remaining nodes, but does not destroy
client data held in the nodes.

\membersection{wxList::Append}

\func{wxNode *}{Append}{\param{wxObject *}{object}}

\func{wxNode *}{Append}{\param{long}{ key}, \param{wxObject *}{object}}

\func{wxNode *}{Append}{\param{const wxString\& }{key}, \param{wxObject *}{object}}

Appends a new {\bf wxNode} to the end of the list and puts a pointer to the
\rtfsp{\it object} in the node.  The last two forms store a key with the object for
later retrieval using the key. The new node is returned in each case.

The key string is copied and stored by the list implementation.

\membersection{wxList::Clear}

\func{void}{Clear}{\void}

Clears the list (but does not delete the client data stored with each node).

\membersection{wxList::DeleteContents}

\func{void}{DeleteContents}{\param{bool}{ destroy}}

If {\it destroy} is TRUE, instructs the list to call {\it delete} on the client contents of
a node whenever the node is destroyed. The default is FALSE.

\membersection{wxList::DeleteNode}

\func{bool}{DeleteNode}{\param{wxNode *}{node}}

Deletes the given node from the list, returning TRUE if successful.

\membersection{wxList::DeleteObject}

\func{bool}{DeleteObject}{\param{wxObject *}{object}}

Finds the given client {\it object} and deletes the appropriate node from the list, returning
TRUE if successful. The application must delete the actual object separately.

\membersection{wxList::Find}

\func{wxNode *}{Find}{\param{long}{ key}}

\func{wxNode *}{Find}{\param{const wxString\& }{key}}

Returns the node whose stored key matches {\it key}. Use on a keyed list only.

\membersection{wxList::First}

\func{wxNode *}{First}{\void}

Returns the first node in the list (NULL if the list is empty).

\membersection{wxList::IndexOf}

\func{int}{IndexOf}{\param{wxObject*}{ obj }}

Returns the index of {\it obj} within the list or NOT\_FOUND if {\it obj}
is not found in the list.

\membersection{wxList::Insert}

\func{wxNode *}{Insert}{\param{wxObject *}{object}}

Insert object at front of list.

\func{wxNode *}{Insert}{\param{wxNode *}{position}, \param{wxObject *}{object}}

Insert object before {\it position}.


\membersection{wxList::Last}

\func{wxNode *}{Last}{\void}

Returns the last node in the list (NULL if the list is empty).

\membersection{wxList::Member}

\func{wxNode *}{Member}{\param{wxObject *}{object}}

Returns the node associated with {\it object} if it is in the list, NULL otherwise.

\membersection{wxList::Nth}

\func{wxNode *}{Nth}{\param{int}{ n}}

Returns the {\it nth} node in the list, indexing from zero (NULL if the list is empty
or the nth node could not be found).

\membersection{wxList::Number}

\func{int}{Number}{\void}

Returns the number of elements in the list.

\membersection{wxList::Sort}

\func{void}{Sort}{\param{wxSortCompareFunction}{ compfunc}}

\begin{verbatim}
  // Type of compare function for list sort operation (as in 'qsort')
  typedef int (*wxSortCompareFunction)(const void *elem1, const void *elem2);
\end{verbatim}

Allows the sorting of arbitrary lists by giving
a function to compare two list elements. We use the system {\bf qsort} function
for the actual sorting process. The sort function receives pointers to wxObject pointers (wxObject **),
so be careful to dereference appropriately.

Example:

\begin{verbatim}
  int listcompare(const void *arg1, const void *arg2)
  {
    return(compare(**(wxString **)arg1,    // use the wxString 'compare'
                   **(wxString **)arg2));  // function 
  }

  void main()
  {
    wxList list;

    list.Append(new wxString("DEF"));
    list.Append(new wxString("GHI"));
    list.Append(new wxString("ABC"));
    list.Sort(listcompare);
  }
\end{verbatim}