added null pointer check and assert

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

\section{\class{wxNotebook}}\label{wxnotebook}

This class represents a notebook control, which manages multiple windows with associated tabs.

To use the class, create a wxNotebook object and call \helpref{AddPage}{wxnotebookaddpage} or \helpref{InsertPage}{wxnotebookinsertpage},
passing a window to be used as the page. Do not explicitly delete the window for a page that is currently
managed by wxNotebook.

{\bf wxNotebookPage} is a typedef for wxWindow.

\wxheading{Derived from}

wxBookCtrlBase (see \helpref{wxBookCtrl overview}{wxbookctrloverview})\\
\helpref{wxControl}{wxcontrol}\\
\helpref{wxWindow}{wxwindow}\\
\helpref{wxEvtHandler}{wxevthandler}\\
\helpref{wxObject}{wxobject}

\wxheading{Include files}

<wx/notebook.h>

\wxheading{Library}

\helpref{wxCore}{librarieslist}

\wxheading{Window styles}

\twocolwidtha{5cm}
\begin{twocollist}\itemsep=0pt
\twocolitem{\windowstyle{wxNB\_TOP}}{Place tabs on the top side.}
\twocolitem{\windowstyle{wxNB\_LEFT}}{Place tabs on the left side.}
\twocolitem{\windowstyle{wxNB\_RIGHT}}{Place tabs on the right side.}
\twocolitem{\windowstyle{wxNB\_BOTTOM}}{Place tabs under instead of above the notebook pages.}
\twocolitem{\windowstyle{wxNB\_FIXEDWIDTH}}{(Windows only) All tabs will have same width.}
\twocolitem{\windowstyle{wxNB\_MULTILINE}}{(Windows only) There can be several rows of tabs.}
\twocolitem{\windowstyle{wxNB\_NOPAGETHEME}}{(Windows only) Display a solid colour on notebook pages, and not a gradient, which can reduce performance.}
\twocolitem{\windowstyle{wxNB\_FLAT}}{(Windows CE only) Show tabs in a flat style.}

\end{twocollist}

The styles \texttt{wxNB\_LEFT}, \texttt{RIGHT} and \texttt{BOTTOM} are not
supported under Microsoft Windows XP when using visual themes.

See also \helpref{window styles overview}{windowstyles}.

\input noteevt.inc

\wxheading{Page backgrounds}

On Windows XP, the default theme paints a gradient on the notebook's pages.
If you wish to suppress this theme, for aesthetic or performance reasons,
there are three ways of doing it. You can use wxNB\_NOPAGETHEME to disable
themed drawing for a particular notebook, you can call {\tt wxSystemOptions::SetOption}
to disable it for the whole application, or you can disable it for individual
pages by using {\tt SetBackgroundColour}.

To disable themed pages globally:

\begin{verbatim}
    wxSystemOptions::SetOption(wxT("msw.notebook.themed-background"), 0);
\end{verbatim}

Set the value to 1 to enable it again.

To give a single page a solid background that more or less fits in with the
overall theme, use:

\begin{verbatim}
    wxColour col = notebook->GetThemeBackgroundColour();
    if (col.Ok())
    {
        page->SetBackgroundColour(col);
    }
\end{verbatim}

On platforms other than Windows, or if the application is not using Windows
themes, {\tt GetThemeBackgroundColour} will return an uninitialised colour object,
and the above code will therefore work on all platforms.

\wxheading{See also}

\helpref{wxBookCtrl}{wxbookctrloverview}, \helpref{wxNotebookEvent}{wxnotebookevent}, \helpref{wxImageList}{wximagelist}, \helpref{notebook sample}{samplenotebook}\rtfsp

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

\membersection{wxNotebook::wxNotebook}\label{wxnotebookctor}

\func{}{wxNotebook}{\void}

Default constructor.

\func{}{wxNotebook}{\param{wxWindow*}{ parent}, \param{wxWindowID }{id}, \param{const wxPoint\&}{ pos = wxDefaultPosition},
 \param{const wxSize\&}{ size = wxDefaultSize}, \param{long}{ style = 0}, \param{const wxString\& }{name = wxNotebookNameStr}}

Constructs a notebook control.

Note that sometimes you can reduce flicker by passing the wxCLIP\_CHILDREN window style.

\wxheading{Parameters}

\docparam{parent}{The parent window. Must be non-NULL.}

\docparam{id}{The window identifier.}

\docparam{pos}{The window position.}

\docparam{size}{The window size.}

\docparam{style}{The window style. See \helpref{wxNotebook}{wxnotebook}.}

\docparam{name}{The name of the control (used only under Motif).}


\membersection{wxNotebook::\destruct{wxNotebook}}\label{wxnotebookdtor}

\func{}{\destruct{wxNotebook}}{\void}

Destroys the wxNotebook object.


\membersection{wxNotebook::AddPage}\label{wxnotebookaddpage}

\func{bool}{AddPage}{\param{wxNotebookPage*}{ page},
 \param{const wxString\&}{ text},
 \param{bool}{ select = false},
 \param{int}{ imageId = -1}}

Adds a new page.

The call to this function may generate the page changing events.

\wxheading{Parameters}

\docparam{page}{Specifies the new page.}

\docparam{text}{Specifies the text for the new page.}

\docparam{select}{Specifies whether the page should be selected.}

\docparam{imageId}{Specifies the optional image index for the new page.}

\wxheading{Return value}

true if successful, false otherwise.

\wxheading{Remarks}

Do not delete the page, it will be deleted by the notebook.

\wxheading{See also}

\helpref{wxNotebook::InsertPage}{wxnotebookinsertpage}


\membersection{wxNotebook::AdvanceSelection}\label{wxnotebookadvanceselection}

\func{void}{AdvanceSelection}{\param{bool}{ forward = true}}

Cycles through the tabs.

The call to this function generates the page changing events.


\membersection{wxNotebook::AssignImageList}\label{wxnotebookassignimagelist}

\func{void}{AssignImageList}{\param{wxImageList*}{ imageList}}

Sets the image list for the page control and takes ownership of
the list.

\wxheading{See also}

\helpref{wxImageList}{wximagelist},
\helpref{SetImageList}{wxnotebooksetimagelist}


\membersection{wxNotebook::Create}\label{wxnotebookcreate}

\func{bool}{Create}{\param{wxWindow*}{ parent}, \param{wxWindowID }{id}, \param{const wxPoint\&}{ pos = wxDefaultPosition},
 \param{const wxSize\&}{ size}, \param{long}{ style = 0}, \param{const wxString\& }{name = wxNotebookNameStr}}

Creates a notebook control. See \helpref{wxNotebook::wxNotebook}{wxnotebookctor} for a description
of the parameters.


\membersection{wxNotebook::DeleteAllPages}\label{wxnotebookdeleteallpages}

\func{bool}{DeleteAllPages}{\void}

Deletes all pages.


\membersection{wxNotebook::DeletePage}\label{wxnotebookdeletepage}

\func{bool}{DeletePage}{\param{size\_t}{ page}}

Deletes the specified page, and the associated window.

The call to this function generates the page changing events.


\membersection{wxNotebook::GetCurrentPage}\label{wxnotebookgetcurrentpage}

\constfunc{wxWindow *}{GetCurrentPage}{\void}

Returns the currently selected notebook page or \NULL.


\membersection{wxNotebook::GetImageList}\label{wxnotebookgetimagelist}

\constfunc{wxImageList*}{GetImageList}{\void}

Returns the associated image list.

\wxheading{See also}

\helpref{wxImageList}{wximagelist}, \helpref{wxNotebook::SetImageList}{wxnotebooksetimagelist}


\membersection{wxNotebook::GetPage}\label{wxnotebookgetpage}

\func{wxNotebookPage*}{GetPage}{\param{size\_t}{ page}}

Returns the window at the given page position.


\membersection{wxNotebook::GetPageCount}\label{wxnotebookgetpagecount}

\constfunc{size\_t}{GetPageCount}{\void}

Returns the number of pages in the notebook control.


\membersection{wxNotebook::GetPageImage}\label{wxnotebookgetpageimage}

\constfunc{int}{GetPageImage}{\param{size\_t }{nPage}}

Returns the image index for the given page.


\membersection{wxNotebook::GetPageText}\label{wxnotebookgetpagetext}

\constfunc{wxString}{GetPageText}{\param{size\_t }{nPage}}

Returns the string for the given page.


\membersection{wxNotebook::GetRowCount}\label{wxnotebookgetrowcount}

\constfunc{int}{GetRowCount}{\void}

Returns the number of rows in the notebook control.


\membersection{wxNotebook::GetSelection}\label{wxnotebookgetselection}

\constfunc{int}{GetSelection}{\void}

Returns the currently selected page, or $-1$ if none was selected.

Note that this method may return either the previously or newly selected page
when called from the {\tt EVT\_NOTEBOOK\_PAGE\_CHANGED} handler depending on
the platform and so\rtfsp
\helpref{wxNotebookEvent::GetSelection}{wxnotebookeventgetselection} should be
used instead in this case.

\membersection{wxNotebook::GetThemeBackgroundColour}\label{wxnotebookgetthemebackgroundcolour}

\constfunc{wxColour}{GetThemeBackgroundColour}{\void}

If running under Windows and themes are enabled for the application, this function
returns a suitable colour for painting the background of a notebook page, and can be passed
to {\tt SetBackgroundColour}. Otherwise, an uninitialised colour will be returned.

\membersection{wxNotebook::HitTest}\label{wxnotebookhittest}

\func{int}{HitTest}{\param{const wxPoint\&}{ pt}, \param{long}{ *flags = {\tt NULL}}}

Returns the index of the tab at the specified position or {\tt wxNOT\_FOUND}
if none. If {\it flags} parameter is non-{\tt NULL}, the position of the point
inside the tab is returned as well.

\wxheading{Parameters}

\docparam{pt}{Specifies the point for the hit test.}

\docparam{flags}{Return value for detailed information. One of the following values:
\twocolwidtha{7cm}
\begin{twocollist}\itemsep=0pt
\twocolitem{{\bf wxBK\_HITTEST\_NOWHERE}}{There was no tab under this point.}
\twocolitem{{\bf wxBK\_HITTEST\_ONICON}}{The point was over an icon (currently wxMSW only).}
\twocolitem{{\bf wxBK\_HITTEST\_ONLABEL}}{The point was over a label (currently wxMSW only).}
\twocolitem{{\bf wxBK\_HITTEST\_ONITEM}}{The point was over an item, but not on the label or icon.}
\twocolitem{{\bf wxBK\_HITTEST\_ONPAGE}}{The point was over a currently selected page, not over any tab. Note that this flag is present only if {\tt wxNOT\_FOUND} is returned.}
\end{twocollist}
}

\wxheading{Return value}

Returns the zero-based tab index or {\tt wxNOT\_FOUND} if there is no tab is at
the specified position.



\membersection{wxNotebook::InsertPage}\label{wxnotebookinsertpage}

\func{bool}{InsertPage}{\param{size\_t}{ index}, \param{wxNotebookPage*}{ page},
 \param{const wxString\&}{ text},
 \param{bool}{ select = false},
 \param{int}{ imageId = -1}}

Inserts a new page at the specified position.

\wxheading{Parameters}

\docparam{index}{Specifies the position for the new page.}

\docparam{page}{Specifies the new page.}

\docparam{text}{Specifies the text for the new page.}

\docparam{select}{Specifies whether the page should be selected.}

\docparam{imageId}{Specifies the optional image index for the new page.}

\wxheading{Return value}

true if successful, false otherwise.

\wxheading{Remarks}

Do not delete the page, it will be deleted by the notebook.

\wxheading{See also}

\helpref{wxNotebook::AddPage}{wxnotebookaddpage}


\membersection{wxNotebook::OnSelChange}\label{wxnotebookonselchange}

\func{void}{OnSelChange}{\param{wxNotebookEvent\&}{ event}}

An event handler function, called when the page selection is changed.

\wxheading{See also}

\helpref{wxNotebookEvent}{wxnotebookevent}


\membersection{wxNotebook::RemovePage}\label{wxnotebookremovepage}

\func{bool}{RemovePage}{\param{size\_t}{ page}}

Deletes the specified page, without deleting the associated window.


\membersection{wxNotebook::SetImageList}\label{wxnotebooksetimagelist}

\func{void}{SetImageList}{\param{wxImageList*}{ imageList}}

Sets the image list for the page control. It does not take
ownership of the image list, you must delete it yourself.

\wxheading{See also}

\helpref{wxImageList}{wximagelist},
\helpref{AssignImageList}{wxnotebookassignimagelist}


\membersection{wxNotebook::SetPadding}\label{wxnotebooksetpadding}

\func{void}{SetPadding}{\param{const wxSize\&}{ padding}}

Sets the amount of space around each page's icon and label, in pixels.

{\bf NB:} The vertical padding cannot be changed in wxGTK.


\membersection{wxNotebook::SetPageSize}\label{wxnotebooksetpagesize}

\func{void}{SetPageSize}{\param{const wxSize\&}{ size}}

Sets the width and height of the pages.

{\bf NB:} This method is currently not implemented for wxGTK.


\membersection{wxNotebook::SetPageImage}\label{wxnotebooksetpageimage}

\func{bool}{SetPageImage}{\param{size\_t}{ page}, \param{int }{image}}

Sets the image index for the given page. {\it image} is an index into
the image list which was set with \helpref{wxNotebook::SetImageList}{wxnotebooksetimagelist}.


\membersection{wxNotebook::SetPageText}\label{wxnotebooksetpagetext}

\func{bool}{SetPageText}{\param{size\_t}{ page}, \param{const wxString\& }{text}}

Sets the text for the given page.


\membersection{wxNotebook::SetSelection}\label{wxnotebooksetselection}

\func{int}{SetSelection}{\param{size\_t}{ page}}

Sets the selection for the given page, returning the previous selection.

The call to this function generates the page changing events.

This function is deprecated and should not be used in new code. Please use the
\helpref{ChangeSelection}{wxnotebookchangeselection} function instead.

\wxheading{See also}

\helpref{wxNotebook::GetSelection}{wxnotebookgetselection}


\membersection{wxNotebook::ChangeSelection}\label{wxnotebookchangeselection}

\func{int}{ChangeSelection}{\param{size\_t}{ page}}

Changes the selection for the given page, returning the previous selection.

The call to this function \emph{does not} generate the page changing events.
This is the only difference with \helpref{SetSelection}{wxnotebooksetselection}.
See \helpref{this topic}{progevent} for more info.