don't crash when setting tooltip for a picker without text control

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

%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%
%% Name:        filepicker.tex
%% Purpose:     wxFilePickerCtrl and wxFileDirPickerEvent documentation
%% Author:      Francesco Montorsi
%% Created:     2006-05-12
%% RCS-ID:      $Id$
%% Copyright:   (c) 2006 Francesco Montorsi
%% License:     wxWindows license
%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%%

\section{\class{wxFilePickerCtrl}}\label{wxfilepickerctrl}

This control allows the user to select a file. The generic implementation is
a button which brings up a \helpref{wxFileDialog}{wxfiledialog} when clicked. Native implementation
may differ but this is usually a (small) widget which give access to the file-chooser
dialog.
It is only available if \texttt{wxUSE\_FILEPICKERCTRL} is set to $1$ (the default).

\wxheading{Derived from}

\helpref{wxPickerBase}{wxpickerbase}\\
\helpref{wxControl}{wxcontrol}\\
\helpref{wxWindow}{wxwindow}\\
\helpref{wxEvtHandler}{wxevthandler}\\
\helpref{wxObject}{wxobject}

\wxheading{Include files}

<wx/filepicker.h>

\wxheading{Window styles}

\twocolwidtha{5cm}%
\begin{twocollist}\itemsep=0pt
\twocolitem{\windowstyle{wxFLP\_DEFAULT\_STYLE}}{The default style: includes
wxFLP\_OPEN | wxFLP\_FILE\_MUST\_EXIST and, under wxMSW only,
wxFLP\_USE\_TEXTCTRL.}
\twocolitem{\windowstyle{wxFLP\_USE\_TEXTCTRL}}{Creates a text control to the left of the
picker button which is completely managed by the \helpref{wxFilePickerCtrl}{wxfilepickerctrl}
and which can be used by the user to specify a path (see \helpref{SetPath}{wxfilepickerctrlsetpath}).
The text control is automatically synchronized with button's value. Use functions defined in \helpref{wxPickerBase}{wxpickerbase} to modify the text control.}
\twocolitem{\windowstyle{wxFLP\_OPEN}}{Creates a picker which allows the user to select a file to open.}
\twocolitem{\windowstyle{wxFLP\_SAVE}}{Creates a picker which allows the user to select a file to save.}
\twocolitem{\windowstyle{wxFLP\_OVERWRITE\_PROMPT}}{Can be combined with wxFLP\_SAVE only: ask confirmation to the user before selecting a file.}
\twocolitem{\windowstyle{wxFLP\_FILE\_MUST\_EXIST}}{Can be combined with wxFLP\_OPEN only: the selected file must be an existing file.}
\twocolitem{\windowstyle{wxFLP\_CHANGE\_DIR}}{Change current working directory on each user file selection change.}

NB: the wxFD\_MULTIPLE style of wxFileDialog is not supported!

\end{twocollist}

\wxheading{Event handling}

To process a file picker event, use these event handler macros to direct input to member
functions that take a \helpref{wxFileDirPickerEvent}{wxfiledirpickerevent} argument.

\twocolwidtha{7cm}%
\begin{twocollist}\itemsep=0pt
\twocolitem{{\bf EVT\_FILEPICKER\_CHANGED(id, func)}}{The user changed the file
selected in the control either using the button or using text control (see
wxFLP\_USE\_TEXTCTRL; note that in this case the event is fired only if the
user's input is valid, e.g. an existing file path if wxFLP\_FILE\_MUST\_EXIST
was given).}
\end{twocollist}

\wxheading{See also}

\helpref{wxFileDialog}{wxfiledialog},\\
\helpref{wxFileDirPickerEvent}{wxfiledirpickerevent}


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

\membersection{wxFilePickerCtrl::wxFilePickerCtrl}\label{wxfilepickerctrl}

\func{}{wxFilePickerCtrl}{\param{wxWindow *}{parent},\rtfsp
\param{wxWindowID}{ id},\rtfsp
\param{const wxString\& }{path = wxEmptyString},\rtfsp
\param{const wxString\& }{message = ``Select a file"},\rtfsp
\param{const wxString\& }{wildcard = ``*.*"},\rtfsp
\param{const wxPoint\& }{pos = wxDefaultPosition},\rtfsp
\param{const wxSize\& }{size = wxDefaultSize},\rtfsp
\param{long}{ style = wxFLP\_DEFAULT\_STYLE},\rtfsp
\param{const wxValidator\& }{validator = wxDefaultValidator},
\param{const wxString\& }{name = ``filepickerctrl"}}

Initializes the object and calls \helpref{Create}{wxfilepickerctrlcreate} with
all the parameters.


\membersection{wxFilePickerCtrl::Create}\label{wxfilepickerctrlcreate}

\func{bool}{Create}{\param{wxWindow *}{parent},\rtfsp
\param{wxWindowID}{ id},\rtfsp
\param{const wxString\& }{path = wxEmptyString},\rtfsp
\param{const wxString\& }{message = ``Select a file"},\rtfsp
\param{const wxString\& }{wildcard = ``*.*"},\rtfsp
\param{const wxPoint\& }{pos = wxDefaultPosition},\rtfsp
\param{const wxSize\& }{size = wxDefaultSize},\rtfsp
\param{long}{ style = wxFLP\_DEFAULT\_STYLE},\rtfsp
\param{const wxValidator\& }{validator = wxDefaultValidator},
\param{const wxString\& }{name = ``filepickerctrl"}}

\wxheading{Parameters}

\docparam{parent}{Parent window, must not be non-\texttt{NULL}.}

\docparam{id}{The identifier for the control.}

\docparam{path}{The initial file shown in the control. Must be a valid path to a file or the empty string.}

\docparam{message}{The message shown to the user in the \helpref{wxFileDialog}{wxfiledialog} shown by the control.}

\docparam{wildcard}{A wildcard which defines user-selectable files (use the same syntax as for \helpref{wxFileDialog}{wxfiledialog}'s wildcards).}

\docparam{pos}{Initial position.}

\docparam{size}{Initial size.}

\docparam{style}{The window style, see {\tt wxFLP\_*} flags.}

\docparam{validator}{Validator which can be used for additional date checks.}

\docparam{name}{Control name.}

\wxheading{Return value}

\true if the control was successfully created or \false if creation failed.


\membersection{wxFilePickerCtrl::GetPath}\label{wxfilepickerctrlgetpath}

\constfunc{wxString}{GetPath}{\void}

Returns the absolute path of the currently selected file.


\membersection{wxFilePickerCtrl::SetPath}\label{wxfilepickerctrlsetpath}

\func{void}{SetPath}{\param{const wxString \&}{filename}}

Sets the absolute path of the currently selected file. This must be a valid file if
the {\tt wxFLP\_FILE\_MUST\_EXIST} style was given.



%% wxFileDirPickerEvent documentation

\section{\class{wxFileDirPickerEvent}}\label{wxfiledirpickerevent}

This event class is used for the events generated by
\helpref{wxFilePickerCtrl}{wxfilepickerctrl} and by \helpref{wxDirPickerCtrl}{wxdirpickerctrl}.

\wxheading{Derived from}

\helpref{wxCommandEvent}{wxcommandevent}\\
\helpref{wxEvent}{wxevent}\\
\helpref{wxObject}{wxobject}

\wxheading{Include files}

<wx/filepicker.h>

\wxheading{Event handling}

To process input from a wxFilePickerCtrl or from a wxDirPickerCtrl, use one of these event handler macros to
direct input to member function that take a \helpref{wxFileDirPickerEvent}{wxfiledirpickerevent} argument:

\twocolwidtha{7cm}
\begin{twocollist}
\twocolitem{{\bf EVT\_FILEPICKER\_CHANGED(id, func)}}{Generated whenever the selected file changes.}
\twocolitem{{\bf EVT\_DIRPICKER\_CHANGED(id, func)}}{Generated whenever the selected directory changes.}
\end{twocollist}%


\wxheading{See also}

\helpref{wxfilepickerctrl}{wxfilepickerctrl}

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

\membersection{wxFileDirPickerEvent::wxFileDirPickerEvent}\label{wxfiledirpickereventctor}

\func{}{wxFileDirPickerEvent}{\param{wxEventType}{ type}, \param{wxObject *}{ generator}, \param{int}{ id}, \param{const wxString&}{ path}}

The constructor is not normally used by the user code.


\membersection{wxFileDirPickerEvent::GetPath}\label{wxfiledirpickereventgetpath}

\constfunc{wxString}{GetPath}{\void}

Retrieve the absolute path of the file/directory the user has just selected.


\membersection{wxFileDirPickerEvent::SetPath}\label{wxfiledirpickereventsetpath}

\func{void}{SetPath}{\param{const wxString \&}{path}}

Set the absolute path of the file/directory associated with the event.