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

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

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%% Name:        menuitem.tex
%% Purpose:     wxMenuItem documentation
%% Author:      wxWidgets Team
%% Modified by:
%% Created:     
%% RCS-ID:      $Id$
%% Copyright:   (c) wxWidgets Team
%% License:     wxWindows license
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\section{\class{wxMenuItem}}\label{wxmenuitem}

A menu item represents an item in a menu. Note that you usually don't have to
deal with it directly as \helpref{wxMenu}{wxmenu} methods usually construct an
object of this class for you.

Also please note that the methods related to fonts and bitmaps are currently
only implemented for Windows and GTK+.

\wxheading{Derived from}

% add wxOwnerDrawn once it is documented
\helpref{wxObject}{wxobject}

\wxheading{Include files}

<wx/menuitem.h>

\wxheading{See also}

\helpref{wxMenuBar}{wxmenubar}, \helpref{wxMenu}{wxmenu}

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


\membersection{wxMenuItem::wxMenuItem}\label{wxmenuitemctor}

\func{}{wxMenuItem}{\param{wxMenu*}{ parentMenu = NULL}, \param{int}{ id = wxID\_SEPARATOR},
 \param{const wxString\& }{text = ""},  \param{const wxString\& }{helpString = ""},
 \param{wxItemKind }{kind = wxITEM\_NORMAL}, \param{wxMenu*}{ subMenu = NULL}}

Constructs a wxMenuItem object.

Menu items can be standard, or ``stock menu items'', or custom. For the
standard menu items (such as commands to open a file, exit the program and so
on, see \helpref{stock items}{stockitems} for the full list) it is enough to
specify just the stock ID and leave \arg{text} and \arg{helpString} empty. In
fact, leaving at least \arg{text} empty for the stock menu items is strongly
recommended as they will have appearance and keyboard interface (including
standard accelerators) familiar to the user.

For the custom (non-stock) menu items, \arg{text} must be specified and while 
\arg{helpString} may be left empty, it's recommended to pass the item
description (which is automatically shown by the library in the status bar when
the menu item is selected) in this parameter.

Finally note that you can e.g. use a stock menu label without using its stock
help string:

\begin{verbatim}
// use all stock properties:
helpMenu->Append(wxID_ABOUT);

// use the stock label and the stock accelerator but not the stock help string:
helpMenu->Append(wxID_ABOUT, wxEmptyString, wxT("My custom help string"));

// use all stock properties except for the bitmap:
wxMenuItem *mymenu = new wxMenuItem(helpMenu, wxID_ABOUT);
mymenu->SetBitmap(wxArtProvider::GetBitmap(wxART_WARNING));
helpMenu->Append(mymenu);
\end{verbatim}

that is, stock properties are set independently one from the other.

\wxheading{Parameters}

\docparam{parentMenu}{Menu that the menu item belongs to.}

\docparam{id}{Identifier for this menu item, or wxID\_SEPARATOR to indicate a separator.}

\docparam{text}{Text for the menu item, as shown on the menu. An accelerator
key can be specified using the ampersand '\&' character. In order to embed an
ampersand character in the menu item text, the ampersand must be doubled.}

\docparam{helpString}{Optional help string that will be shown on the status bar.}

\docparam{kind}{May be {\tt wxITEM\_SEPARATOR}, {\tt wxITEM\_NORMAL}, 
{\tt wxITEM\_CHECK} or {\tt wxITEM\_RADIO}}

\docparam{subMenu}{If non-NULL, indicates that the menu item is a submenu.}


\membersection{wxMenuItem::\destruct{wxMenuItem}}\label{wxmenuitemdtor}

\func{}{\destruct{wxMenuItem}}{\void}

Destructor.


\membersection{wxMenuItem::Check}\label{wxmenuitemcheck}

\func{void}{Check}{\param{bool}{ check = true}}

Checks or unchecks the menu item.

Note that this only works when the item is already appended to a menu.


\membersection{wxMenuItem::Enable}\label{wxmenuitemenable}

\func{void}{Enable}{\param{bool}{ enable = true}}

Enables or disables the menu item.


\membersection{wxMenuItem::GetBackgroundColour}\label{wxmenuitemgetbackgroundcolour}

\constfunc{wxColour\&}{GetBackgroundColour}{\void}

Returns the background colour associated with the menu item (Windows only).


\membersection{wxMenuItem::GetBitmap}\label{wxmenuitemgetbitmap}

\constfunc{wxBitmap\&}{GetBitmap}{\param{bool}{ checked = true}}

Returns the checked or unchecked bitmap (Windows only).


\membersection{wxMenuItem::GetFont}\label{wxmenuitemgetfont}

\constfunc{wxFont\&}{GetFont}{\void}

Returns the font associated with the menu item (Windows only).


\membersection{wxMenuItem::GetHelp}\label{wxmenuitemgethelp}

\constfunc{wxString}{GetHelp}{\void}

Returns the help string associated with the menu item.


\membersection{wxMenuItem::GetId}\label{wxmenuitemgetid}

\constfunc{int}{GetId}{\void}

Returns the menu item identifier.


\membersection{wxMenuItem::GetKind}\label{wxmenuitemgetkind}

\constfunc{wxItemKind}{GetKind}{\void}

Returns the item kind, one of {\tt wxITEM\_SEPARATOR}, {\tt wxITEM\_NORMAL}, 
{\tt wxITEM\_CHECK} or {\tt wxITEM\_RADIO}.


\membersection{wxMenuItem::GetLabel}\label{wxmenuitemgetlabel}

\constfunc{wxString}{GetLabel}{\void}

Returns the text associated with the menu item without any accelerator
characters it might contain.

\wxheading{See also}

\helpref{GetText}{wxmenuitemgettext}, 
\helpref{GetLabelFromText}{wxmenuitemgetlabelfromtext}


\membersection{wxMenuItem::GetLabelFromText}\label{wxmenuitemgetlabelfromtext}

\func{static wxString}{GetLabelFromText}{\param{const wxString\& }{text}}

Strips all accelerator characters and mnemonics from the given {\it text}.
For example,

\begin{verbatim}
wxMenuItem::GetLabelFromText("&Hello\tCtrl-H");
\end{verbatim}

will return just {\tt "Hello"}.

\wxheading{See also}

\helpref{GetText}{wxmenuitemgettext}, 
\helpref{GetLabel}{wxmenuitemgetlabel}


\membersection{wxMenuItem::GetMarginWidth}\label{wxmenuitemgetmarginwidth}

\constfunc{int}{GetMarginWidth}{\void}

Gets the width of the menu item checkmark bitmap (Windows only).


\membersection{wxMenuItem::GetMenu}\label{wxmenuitemgetmenu}

\constfunc{wxMenu*}{GetMenu}{\void}

Returns the menu this menu item is in, or NULL if this menu item is not attached.


\membersection{wxMenuItem::GetName}\label{wxmenuitemgetname}

\constfunc{wxString}{GetName}{\void}

Returns the text associated with the menu item.

{\bf NB:} this function is deprecated, please use 
\helpref{GetText}{wxmenuitemgettext} or \helpref{GetLabel}{wxmenuitemgetlabel} 
instead.


\membersection{wxMenuItem::GetText}\label{wxmenuitemgettext}

\constfunc{wxString}{GetText}{\void}

Returns the text associated with the menu item, such as it was passed to the
wxMenuItem constructor, i.e. with any accelerator characters it may contain.

\wxheading{See also}

\helpref{GetLabel}{wxmenuitemgetlabel}, 
\helpref{GetLabelFromText}{wxmenuitemgetlabelfromtext}


\membersection{wxMenuItem::GetSubMenu}\label{wxmenuitemgetsubmenu}

\constfunc{wxMenu*}{GetSubMenu}{\void}

Returns the submenu associated with the menu item, or NULL if there isn't one.


\membersection{wxMenuItem::GetTextColour}\label{wxmenuitemgettextcolour}

\constfunc{wxColour\&}{GetTextColour}{\void}

Returns the text colour associated with the menu item (Windows only).


\membersection{wxMenuItem::IsCheckable}\label{wxmenuitemischeckable}

\constfunc{bool}{IsCheckable}{\void}

Returns true if the item is checkable.


\membersection{wxMenuItem::IsChecked}\label{wxmenuitemischecked}

\constfunc{bool}{IsChecked}{\void}

Returns true if the item is checked.


\membersection{wxMenuItem::IsEnabled}\label{wxmenuitemisenabled}

\constfunc{bool}{IsEnabled}{\void}

Returns true if the item is enabled.


\membersection{wxMenuItem::IsSeparator}\label{wxmenuitemisseparator}

\constfunc{bool}{IsSeparator}{\void}

Returns true if the item is a separator.


\membersection{wxMenuItem::IsSubMenu}\label{wxmenuitemissubmenu}

\constfunc{bool}{IsSubMenu}{\void}

Returns true if the item is a submenu.


\membersection{wxMenuItem::SetBackgroundColour}\label{wxmenuitemsetbackgroundcolour}

\constfunc{void}{SetBackgroundColour}{\param{const wxColour\& }{colour}}

Sets the background colour associated with the menu item (Windows only).


\membersection{wxMenuItem::SetBitmap}\label{wxmenuitemsetbitmap}

\func{void}{SetBitmap}{\param{const wxBitmap\& }{bmp}}

Sets the bitmap for the menu item (Windows and GTK+ only). It is
equivalent to \helpref{SetBitmaps}{wxmenuitemsetbitmaps}(bmp, wxNullBitmap).


\membersection{wxMenuItem::SetBitmaps}\label{wxmenuitemsetbitmaps}

\func{void}{SetBitmaps}{\param{const wxBitmap\& }{checked},
 \param{const wxBitmap\& }{unchecked = wxNullBitmap}}

Sets the checked/unchecked bitmaps for the menu item (Windows only). The first bitmap
is also used as the single bitmap for uncheckable menu items.


\membersection{wxMenuItem::SetFont}\label{wxmenuitemsetfont}

\func{void}{SetFont}{\param{const wxFont\& }{font}}

Sets the font associated with the menu item (Windows only).


\membersection{wxMenuItem::SetHelp}\label{wxmenuitemsethelp}

\func{void}{SetHelp}{\param{const wxString\& }{helpString}}

Sets the help string.


\membersection{wxMenuItem::SetMarginWidth}\label{wxmenuitemsetmarginwidth}

\constfunc{void}{SetMarginWidth}{\param{int}{ width}}

Sets the width of the menu item checkmark bitmap (Windows only).


\membersection{wxMenuItem::SetMenu}\label{wxmenuitemsetmenu}

\func{void}{SetMenu}{\param{const wxMenu*}{menu}}

Sets the parent menu which will contain this menu item.


\membersection{wxMenuItem::SetSubMenu}\label{wxmenuitemsetsubmenu}

\func{void}{SetSubMenu}{\param{const wxMenu*}{menu}}

Sets the submenu of this menu item.


\membersection{wxMenuItem::SetText}\label{wxmenuitemsettext}

\func{void}{SetText}{\param{const wxString\& }{text}}

Sets the text associated with the menu item.


\membersection{wxMenuItem::SetTextColour}\label{wxmenuitemsettextcolour}

\func{void}{SetTextColour}{\param{const wxColour\& }{colour}}

Sets the text colour associated with the menu item (Windows only).