wxWidgets/docs/latex/wx/treectrl.tex

\section{\class{wxTreeCtrl}}\label{wxtreectrl}

A tree control presents information as a hierarchy, with items that may be expanded
to show further items. Items in a tree control are referenced by wxTreeItemId handles.

To intercept events from a tree control, use the event table macros described in \helpref{wxTreeEvent}{wxtreeevent}.

\wxheading{Derived from}

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

\wxheading{Include files}

<wx/treectrl.h>

\wxheading{Window styles}

\twocolwidtha{5cm}
\begin{twocollist}\itemsep=0pt
\twocolitem{\windowstyle{wxTR\_HAS\_BUTTONS}}{Use this style to show + and - buttons to the
left of parent items. Win32 only. }
\twocolitem{\windowstyle{wxTR\_NO\_LINES}}{Use this style to hide vertical lines.
Win32 only. }
\twocolitem{\windowstyle{wxTR\_LINES\_AT\_ROOT}}{Use this style to show lines at the
tree root. Win32 only.}
\twocolitem{\windowstyle{wxTR\_EDIT\_LABELS}}{Use this style if you wish the user to be
able to edit labels in the tree control.}
\twocolitem{\windowstyle{wxTR\_MULTIPLE}}{Use this style to allow the user to
select more than one item in the control - by default, only one item may be
selected.}
\end{twocollist}

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

\wxheading{Event handling}

To process input from a tree control, use these event handler macros to direct input to member
functions that take a \helpref{wxTreeEvent}{wxtreeevent} argument.

\twocolwidtha{7cm}
\begin{twocollist}\itemsep=0pt
\twocolitem{{\bf EVT\_TREE\_BEGIN\_DRAG(id, func)}}{Begin dragging with the left mouse button.}
\twocolitem{{\bf EVT\_TREE\_BEGIN\_RDRAG(id, func)}}{Begin dragging with the right mouse button.}
\twocolitem{{\bf EVT\_TREE\_BEGIN\_LABEL\_EDIT(id, func)}}{Begin editing a label. This can be prevented by calling \helpref{Veto()}{wxnotifyeventveto}.}
\twocolitem{{\bf EVT\_TREE\_END\_LABEL\_EDIT(id, func)}}{Finish editing a label. This can be prevented by calling \helpref{Veto()}{wxnotifyeventveto}.}
\twocolitem{{\bf EVT\_TREE\_DELETE\_ITEM(id, func)}}{Delete an item.}
\twocolitem{{\bf EVT\_TREE\_GET\_INFO(id, func)}}{Request information from the application.}
\twocolitem{{\bf EVT\_TREE\_SET\_INFO(id, func)}}{Information is being supplied.}
\twocolitem{{\bf EVT\_TREE\_ITEM\_ACTIVATED(id, func)}}{The item has been activated, i.e. chosen by double clicking it with mouse or from keyboard}
\twocolitem{{\bf EVT\_TREE\_ITEM\_COLLAPSED(id, func)}}{The item has been collapsed.}
\twocolitem{{\bf EVT\_TREE\_ITEM\_COLLAPSING(id, func)}}{The item is being collapsed. This can be prevented by calling \helpref{Veto()}{wxnotifyeventveto}.}
\twocolitem{{\bf EVT\_TREE\_ITEM\_EXPANDED(id, func)}}{The item has been expanded.}
\twocolitem{{\bf EVT\_TREE\_ITEM\_EXPANDING(id, func)}}{The item is being expanded. This can be prevented by calling \helpref{Veto()}{wxnotifyeventveto}.}
\twocolitem{{\bf EVT\_TREE\_SEL\_CHANGED(id, func)}}{Selection has changed.}
\twocolitem{{\bf EVT\_TREE\_SEL\_CHANGING(id, func)}}{Selection is changing. This can be prevented by calling \helpref{Veto()}{wxnotifyeventveto}.}
\twocolitem{{\bf EVT\_TREE\_KEY\_DOWN(id, func)}}{A key has been pressed.}
\end{twocollist}%

\wxheading{See also}

\helpref{wxTreeItemData}{wxtreeitemdata}, \helpref{wxTreeCtrl overview}{wxtreectrloverview}, \helpref{wxListBox}{wxlistbox}, \helpref{wxListCtrl}{wxlistctrl},\rtfsp
\helpref{wxImageList}{wximagelist}, \helpref{wxTreeEvent}{wxtreeevent}

\wxheading{Win32 notes}

wxTreeCtrl class uses the standard common treeview control under Win32
implemented in the system library {\tt comctl32.dll}. Some versions of this
library are known to have bugs with handling the tree control colours: the
usual symptom is that the expanded items leave black (or otherwise incorrectly
coloured) background behind them, especially for the controls using non
default background colour. The recommended solution is to upgrade the {\tt comctl32.dll}
to a newer version: see
\urlref{http://www.microsoft.com/msdownload/ieplatform/ie/comctrlx86.asp}{http://www.microsoft.com/msdownload/ieplatform/ie/comctrlx86.asp}.

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

\membersection{wxTreeCtrl::wxTreeCtrl}\label{wxtreectrlconstr}

\func{}{wxTreeCtrl}{\void}

Default constructor.

\func{}{wxTreeCtrl}{\param{wxWindow*}{ parent}, \param{wxWindowID}{ id},\rtfsp
\param{const wxPoint\&}{ pos = wxDefaultPosition}, \param{const wxSize\&}{ size = wxDefaultSize},\rtfsp
\param{long}{ style = wxTR\_HAS\_BUTTONS}, \param{const wxValidator\& }{validator = wxDefaultValidator}, \param{const wxString\& }{name = ``listCtrl"}}

Constructor, creating and showing a tree control.

\wxheading{Parameters}

\docparam{parent}{Parent window. Must not be NULL.}

\docparam{id}{Window identifier. A value of -1 indicates a default value.}

\docparam{pos}{Window position.}

\docparam{size}{Window size. If the default size (-1, -1) is specified then the window is sized
appropriately.}

\docparam{style}{Window style. See \helpref{wxTreeCtrl}{wxtreectrl}.}

\docparam{validator}{Window validator.}

\docparam{name}{Window name.}

\wxheading{See also}

\helpref{wxTreeCtrl::Create}{wxtreectrlcreate}, \helpref{wxValidator}{wxvalidator}

\membersection{wxTreeCtrl::\destruct{wxTreeCtrl}}

\func{void}{\destruct{wxTreeCtrl}}{\void}

Destructor, destroying the list control.

\membersection{wxTreeCtrl::AddRoot}\label{wxtreectrladdroot}

\func{wxTreeItemId}{AddRoot}{\param{const wxString\&}{ text},
 \param{int}{ image = -1}, \param{int}{ selImage = -1}, \param{wxTreeItemData*}{ data = NULL}}

Adds the root node to the tree, returning the new item.

If {\it image} > -1 and {\it selImage} is -1, the same image is used for
both selected and unselected items.

\membersection{wxTreeCtrl::AppendItem}\label{wxtreectrlappenditem}

\func{wxTreeItemId}{AppendItem}{\param{const wxTreeItemId\& }{parent}, \param{const wxString\&}{ text},
 \param{int}{ image = -1}, \param{int}{ selImage = -1}, \param{wxTreeItemData*}{ data = NULL}}

Appends an item to the end of the branch identified by {\it parent}, return a new item id.

If {\it image} > -1 and {\it selImage} is -1, the same image is used for
both selected and unselected items.

\membersection{wxTreeCtrl::AssignImageList}\label{wxtreectrlassignimagelist}

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

Sets the normal image list. Image list assigned with this method will
be deleted by wxTreeCtrl's destructor (i.e. it takes ownership of it).

See also \helpref{SetImageList}{wxtreectrlsetimagelist}.

\membersection{wxTreeCtrl::AssignStateImageList}\label{wxtreectrlassignstateimagelist}

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

Sets the state image list. Image list assigned with this method will
be deleted by wxTreeCtrl's destructor (i.e. it takes ownership of it).

See also \helpref{SetStateImageList}{wxtreectrlsetstateimagelist}.


\membersection{wxTreeCtrl::Collapse}\label{wxtreectrlcollapse}

\func{void}{Collapse}{\param{const wxTreeItemId\&}{ item}}

Collapses the given item.

\membersection{wxTreeCtrl::CollapseAndReset}\label{wxtreectrlcollapseandreset}

\func{void}{CollapseAndReset}{\param{const wxTreeItemId\&}{ item}}

Collapses the given item and removes all children.

\membersection{wxTreeCtrl::Create}\label{wxtreectrlcreate}

\func{bool}{wxTreeCtrl}{\param{wxWindow*}{ parent}, \param{wxWindowID}{ id},\rtfsp
\param{const wxPoint\&}{ pos = wxDefaultPosition}, \param{const wxSize\&}{ size = wxDefaultSize},\rtfsp
\param{long}{ style = wxTR\_HAS\_BUTTONS}, \param{const wxValidator\& }{validator = wxDefaultValidator}, \param{const wxString\& }{name = ``listCtrl"}}

Creates the tree control. See \helpref{wxTreeCtrl::wxTreeCtrl}{wxtreectrlconstr} for further details.

\membersection{wxTreeCtrl::Delete}\label{wxtreectrldelete}

\func{void}{Delete}{\param{const wxTreeItemId\&}{ item}}

Deletes the specified item.

\membersection{wxTreeCtrl::DeleteAllItems}\label{wxtreectrldeleteallitems}

\func{void}{DeleteAllItems}{\void}

Deletes all the items in the control.

\membersection{wxTreeCtrl::EditLabel}\label{wxtreectrleditlabel}

\func{void}{EditLabel}{\param{const wxTreeItemId\&}{ item}}

Starts editing the label of the given item. This function generates a
EVT\_TREE\_BEGIN\_LABEL\_EDIT event which can be vetoed so that no
text control will appear for in-place editing.

If the user changed the label (i.e. s/he does not press ESC or leave
the text control without changes, a EVT\_TREE\_END\_LABEL\_EDIT event
will be sent which can be vetoed as well.

\wxheading{See also}

\helpref{wxTreeCtrl::EndEditLabel}{wxtreectrlendeditlabel},
\helpref{wxTreeEvent}{wxtreeevent}

\membersection{wxTreeCtrl::EndEditLabel}\label{wxtreectrlendeditlabel}

\func{void}{EndEditLabel}{\param{bool }{cancelEdit}}

Ends label editing. If {\it cancelEdit} is TRUE, the edit will be cancelled.

This function is currently supported under Windows only.

\wxheading{See also}

\helpref{wxTreeCtrl::EditLabel}{wxtreectrleditlabel}

\membersection{wxTreeCtrl::EnsureVisible}\label{wxtreectrlensurevisible}

\func{void}{EnsureVisible}{\param{const wxTreeItemId\&}{ item}}

Scrolls and/or expands items to ensure that the given item is visible.

\membersection{wxTreeCtrl::Expand}\label{wxtreectrlexpand}

\func{void}{Expand}{\param{const wxTreeItemId\&}{ item}}

Expands the given item.

\membersection{wxTreeCtrl::GetBoundingRect}\label{wxtreectrlgetitemrect}

\constfunc{bool}{GetBoundingRect}{\param{const wxTreeItemId\&}{ item}, \param{wxRect\& }{rect}, \param{bool }{textOnly = FALSE}}

Retrieves the rectangle bounding the {\it item}. If {\it textOnly} is TRUE,
only the rectangle around the items label will be returned, otherwise the
items image is also taken into account.

The return value is TRUE if the rectangle was successfully retrieved or FALSE
if it was not (in this case {\it rect} is not changed) - for example, if the
item is currently invisible.

\pythonnote{The wxPython version of this method requires only the
{\tt item} and {\tt textOnly} parameters.  The return value is either a
{\tt wxRect} object or {\tt None}.}

\membersection{wxTreeCtrl::GetChildrenCount}\label{wxtreectrlgetchildrencount}

\constfunc{size\_t}{GetChildrenCount}{\param{const wxTreeItemId\&}{ item}, \param{bool}{ recursively = TRUE}}

Returns the number of items in the branch. If {\it recursively} is TRUE, returns the total number
of descendants, otherwise only one level of children is counted.

\membersection{wxTreeCtrl::GetCount}\label{wxtreectrlgetcount}

\constfunc{int}{GetCount}{\void}

Returns the number of items in the control.

\membersection{wxTreeCtrl::GetEditControl}\label{wxtreectrlgeteditcontrol}

\constfunc{wxTextCtrl\&}{GetEditControl}{\void}

Returns the edit control used to edit a label.

\membersection{wxTreeCtrl::GetFirstChild}\label{wxtreectrlgetfirstchild}

\constfunc{wxTreeItemId}{GetFirstChild}{\param{const wxTreeItemId\&}{ item}, \param{long\& }{cookie}}

Returns the first child; call \helpref{wxTreeCtrl::GetNextChild}{wxtreectrlgetnextchild} for the next child.

For this enumeration function you must pass in a `cookie' parameter
which is opaque for the application but is necessary for the library
to make these functions reentrant (i.e. allow more than one
enumeration on one and the same object simultaneously). The cookie passed to
GetFirstChild and GetNextChild should be the same.

Returns an invalid tree item if there are no further children.

\wxheading{See also}

\helpref{wxTreeCtrl::GetNextChild}{wxtreectrlgetnextchild}

\pythonnote{In wxPython the returned wxTreeItemId and the new cookie
value are both returned as a tuple containing the two values.}

\membersection{wxTreeCtrl::GetFirstVisibleItem}\label{wxtreectrlgetfirstvisibleitem}

\constfunc{wxTreeItemId}{GetFirstVisibleItem}{\void}

Returns the first visible item.

\membersection{wxTreeCtrl::GetImageList}\label{wxtreectrlgetimagelist}

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

Returns the normal image list.

\membersection{wxTreeCtrl::GetIndent}\label{wxtreectrlgetindent}

\constfunc{int}{GetIndent}{\void}

Returns the current tree control indentation.

\membersection{wxTreeCtrl::GetItemData}\label{wxtreectrlgetitemdata}

\constfunc{wxTreeItemData*}{GetItemData}{\param{const wxTreeItemId\&}{ item}}

Returns the tree item data associated with the item.

\wxheading{See also}

\helpref{wxTreeItemData}{wxtreeitemdata}

\pythonnote{wxPython provides the following shortcut method:

\indented{2cm}{\begin{twocollist}\itemsep=0pt
\twocolitem{{\bf GetPyData(item)}}{Returns the Python Object
associated with the wxTreeItemData for the given item Id.}
\end{twocollist}}
}

\membersection{wxTreeCtrl::GetItemImage}\label{wxtreectrlgetitemimage}

\constfunc{int}{GetItemImage}{\param{const wxTreeItemId\& }{item},
 \param{wxTreeItemIcon }{which = wxTreeItemIcon\_Normal}}

Gets the specified item image. The value of {\it which} may be:

\begin{itemize}\itemsep=0pt
\item{wxTreeItemIcon\_Normal} to get the normal item image
\item{wxTreeItemIcon\_Selected} to get the selected item image (i.e. the image
which is shown when the item is currently selected)
\item{wxTreeItemIcon\_Expanded} to get the expanded image (this only
makes sense for items which have children - then this image is shown when the
item is expanded and the normal image is shown when it is collapsed)
\item{wxTreeItemIcon\_SelectedExpanded} to get the selected expanded image
(which is shown when an expanded item is currently selected)
\end{itemize}

\membersection{wxTreeCtrl::GetItemText}\label{wxtreectrlgetitemtext}

\constfunc{wxString}{GetItemText}{\param{const wxTreeItemId\&}{ item}}

Returns the item label.

\membersection{wxTreeCtrl::GetLastChild}\label{wxtreectrlgetlastchild}

\constfunc{wxTreeItemId}{GetLastChild}{\param{const wxTreeItemId\&}{ item}}

Returns the last child of the item (or an invalid tree item if this item has no children).

\wxheading{See also}

\helpref{GetFirstChild}{wxtreectrlgetfirstchild},
\helpref{GetLastChild}{wxtreectrlgetlastchild}

\membersection{wxTreeCtrl::GetNextChild}\label{wxtreectrlgetnextchild}

\constfunc{wxTreeItemId}{GetNextChild}{\param{const wxTreeItemId\&}{ item}, \param{long\& }{cookie}}

Returns the next child; call \helpref{wxTreeCtrl::GetFirstChild}{wxtreectrlgetfirstchild} for the first child.

For this enumeration function you must pass in a `cookie' parameter
which is opaque for the application but is necessary for the library
to make these functions reentrant (i.e. allow more than one
enumeration on one and the same object simultaneously). The cookie passed to
GetFirstChild and GetNextChild should be the same.

Returns an invalid tree item if there are no further children.

\wxheading{See also}

\helpref{wxTreeCtrl::GetFirstChild}{wxtreectrlgetfirstchild}

\pythonnote{In wxPython the returned wxTreeItemId and the new cookie
value are both returned as a tuple containing the two values.}

\membersection{wxTreeCtrl::GetNextSibling}\label{wxtreectrlgetnextsibling}

\constfunc{wxTreeItemId}{GetNextSibling}{\param{const wxTreeItemId\&}{ item}}

Returns the next sibling of the specified item; call \helpref{wxTreeCtrl::GetPrevSibling}{wxtreectrlgetprevsibling} for the previous sibling.

Returns an invalid tree item if there are no further siblings.

\wxheading{See also}

\helpref{wxTreeCtrl::GetPrevSibling}{wxtreectrlgetprevsibling}

\membersection{wxTreeCtrl::GetNextVisible}\label{wxtreectrlgetnextvisible}

\constfunc{wxTreeItemId}{GetNextVisible}{\param{const wxTreeItemId\&}{ item}}

Returns the next visible item.

\membersection{wxTreeCtrl::GetParent}\label{wxtreectrlgetparent}

\constfunc{wxTreeItemId}{GetParent}{\param{const wxTreeItemId\&}{ item}}

Returns the item's parent.

\pythonnote{This method is named {\tt GetItemParent} to avoid a name
clash with wxWindow::GetParent.}

\membersection{wxTreeCtrl::GetPrevSibling}\label{wxtreectrlgetprevsibling}

\constfunc{wxTreeItemId}{GetPrevSibling}{\param{const wxTreeItemId\&}{ item}}

Returns the previous sibling of the specified item; call \helpref{wxTreeCtrl::GetNextSibling}{wxtreectrlgetnextsibling} for the next sibling.

Returns an invalid tree item if there are no further children.

\wxheading{See also}

\helpref{wxTreeCtrl::GetNextSibling}{wxtreectrlgetnextsibling}

\membersection{wxTreeCtrl::GetPrevVisible}\label{wxtreectrlgetprevvisible}

\constfunc{wxTreeItemId}{GetPrevVisible}{\param{const wxTreeItemId\&}{ item}}

Returns the previous visible item.

\membersection{wxTreeCtrl::GetRootItem}\label{wxtreectrlgetrootitem}

\constfunc{wxTreeItemId}{GetRootItem}{\void}

Returns the root item for the tree control.

\membersection{wxTreeCtrl::GetItemSelectedImage}\label{wxtreectrlgetitemselectedimage}

\constfunc{int}{GetItemSelectedImage}{\param{const wxTreeItemId\& }{item}}

Gets the selected item image (this function is obsolete, use
{\tt GetItemImage(item, wxTreeItemIcon\_Selected}) instead).

\membersection{wxTreeCtrl::GetSelection}\label{wxtreectrlgetselection}

\constfunc{wxTreeItemId}{GetSelection}{\void}

Returns the selection, or an invalid item if there is no selection.
This function only works with the controls without wxTR\_MULTIPLE style, use
\helpref{GetSelections}{wxtreectrlgetselections} for the controls which do have
this style.

\membersection{wxTreeCtrl::GetSelections}\label{wxtreectrlgetselections}

\constfunc{size\_t}{GetSelections}{\param{wxArrayTreeItemIds\& }{selection}}

Fills the array of tree items passed in with the currently selected items. This
function can be called only if the control has the wxTR\_MULTIPLE style.

Returns the number of selected items.

\pythonnote{The wxPython version of this method accepts no parameters
and returns a Python list of {\tt wxTreeItemId}s.}

\membersection{wxTreeCtrl::GetStateImageList}\label{wxtreectrlgetstateimagelist}

\constfunc{wxImageList*}{GetStateImageList}{\void}

Returns the state image list (from which application-defined state images are taken).

\membersection{wxTreeCtrl::HitTest}\label{wxtreectrlhittest}

\func{wxTreeItemId}{HitTest}{\param{const wxPoint\& }{point}, \param{int\& }{flags}}

Calculates which (if any) item is under the given point, returning the tree item
id at this point plus extra information {\it flags}. {\it flags} is a bitlist of the following:

\twocolwidtha{5cm}
\begin{twocollist}\itemsep=0pt
\twocolitem{wxTREE\_HITTEST\_ABOVE}{Above the client area.}
\twocolitem{wxTREE\_HITTEST\_BELOW}{Below the client area.}
\twocolitem{wxTREE\_HITTEST\_NOWHERE}{In the client area but below the last item.}
\twocolitem{wxTREE\_HITTEST\_ONITEMBUTTON}{On the button associated with an item.}
\twocolitem{wxTREE\_HITTEST\_ONITEMICON}{On the bitmap associated with an item.}
\twocolitem{wxTREE\_HITTEST\_ONITEMINDENT}{In the indentation associated with an item.}
\twocolitem{wxTREE\_HITTEST\_ONITEMLABEL}{On the label (string) associated with an item.}
\twocolitem{wxTREE\_HITTEST\_ONITEMRIGHT}{In the area to the right of an item.}
\twocolitem{wxTREE\_HITTEST\_ONITEMSTATEICON}{On the state icon for a tree view item that is in a user-defined state.}
\twocolitem{wxTREE\_HITTEST\_TOLEFT}{To the right of the client area.}
\twocolitem{wxTREE\_HITTEST\_TORIGHT}{To the left of the client area.}
\end{twocollist}

\pythonnote{in wxPython both the wxTreeItemId and the flags are
returned as a tuple.}

\membersection{wxTreeCtrl::InsertItem}\label{wxtreectrlinsertitem}

\func{wxTreeItemId}{InsertItem}{\param{const wxTreeItemId\& }{parent}, \param{const wxTreeItemId\& }{previous}, \param{const wxString\&}{ text},
 \param{int}{ image = -1}, \param{int}{ selImage = -1}, \param{wxTreeItemData*}{ data = NULL}}

\func{wxTreeItemId}{InsertItem}{\param{const wxTreeItemId\& }{parent}, \param{size\_t}{ before}, \param{const wxString\&}{ text},
 \param{int}{ image = -1}, \param{int}{ selImage = -1}, \param{wxTreeItemData*}{ data = NULL}}

Inserts an item after a given one ({\it previous}) or before one identified by its position ({\it before}).

If {\it image} > -1 and {\it selImage} is -1, the same image is used for
both selected and unselected items.

\pythonnote{The second form of this method is called
\tt{InsertItemBefore} in wxPython.}

\membersection{wxTreeCtrl::IsBold}\label{wxtreectrlisbold}

\constfunc{bool}{IsBold}{\param{const wxTreeItemId\& }{item}}

Returns TRUE if the given item is in bold state.

See also: \helpref{SetItemBold}{wxtreectrlsetitembold}

\membersection{wxTreeCtrl::IsExpanded}\label{wxtreectrlisexpanded}

\constfunc{bool}{IsExpanded}{\param{const wxTreeItemId\&}{ item}}

Returns TRUE if the item is expanded (only makes sense if it has children).

\membersection{wxTreeCtrl::IsSelected}\label{wxtreectrlisselected}

\constfunc{bool}{IsSelected}{\param{const wxTreeItemId\&}{ item}}

Returns TRUE if the item is selected.

\membersection{wxTreeCtrl::IsVisible}\label{wxtreectrlisvisible}

\constfunc{bool}{IsVisible}{\param{const wxTreeItemId\&}{ item}}

Returns TRUE if the item is visible (it might be outside the view, or not expanded).

\membersection{wxTreeCtrl::ItemHasChildren}\label{wxtreectrlitemhaschildren}

\constfunc{bool}{ItemHasChildren}{\param{const wxTreeItemId\&}{ item}}

Returns TRUE if the item has children.

\membersection{wxTreeCtrl::OnCompareItems}\label{wxtreectrloncompareitems}

\func{int}{OnCompareItems}{\param{const wxTreeItemId\& }{item1}, \param{const wxTreeItemId\& }{item2}}

Override this function in the derived class to change the sort order of the
items in the tree control. The function should return a negative, zero or
positive value if the first item is less than, equal to or greater than the
second one.

The base class version compares items alphabetically.

See also: \helpref{SortChildren}{wxtreectrlsortchildren}

\membersection{wxTreeCtrl::PrependItem}\label{wxtreectrlprependitem}

\func{wxTreeItemId}{PrependItem}{\param{const wxTreeItemId\& }{parent}, \param{const wxString\&}{ text},
 \param{int}{ image = -1}, \param{int}{ selImage = -1}, \param{wxTreeItemData*}{ data = NULL}}

Appends an item as the first child of {\it parent}, return a new item id.

If {\it image} > -1 and {\it selImage} is -1, the same image is used for
both selected and unselected items.

\membersection{wxTreeCtrl::ScrollTo}\label{wxtreectrlscrollto}

\func{void}{ScrollTo}{\param{const wxTreeItemId\&}{ item}}

Scrolls the specified item into view.

\membersection{wxTreeCtrl::SelectItem}\label{wxtreectrlselectitem}

\func{bool}{SelectItem}{\param{const wxTreeItemId\&}{ item}}

Selects the given item.

\membersection{wxTreeCtrl::SetIndent}\label{wxtreectrlsetindent}

\func{void}{SetIndent}{\param{int }{indent}}

Sets the indentation for the tree control.

\membersection{wxTreeCtrl::SetImageList}\label{wxtreectrlsetimagelist}

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

Sets the normal image list. Image list assigned with this method will
{\bf not} be deleted by wxTreeCtrl's destructor, you must delete it yourself.

See also \helpref{AssignImageList}{wxtreectrlassignimagelist}.


\membersection{wxTreeCtrl::SetItemBackgroundColour}\label{wxtreectrlsetitembackgroundcolour}

\func{void}{SetItemBackgroundColour}{\param{const wxTreeItemId\&}{ item}, \param{const wxColour\& }{col}}

Sets the colour of the items background.

\membersection{wxTreeCtrl::SetItemBold}\label{wxtreectrlsetitembold}

\func{void}{SetItemBold}{\param{const wxTreeItemId\& }{item}, \param{bool}{ bold = TRUE}}

Makes item appear in bold font if {\it bold} parameter is TRUE or resets it to
the normal state.

See also: \helpref{IsBold}{wxtreectrlisbold}

\membersection{wxTreeCtrl::SetItemData}\label{wxtreectrlsetitemdata}

\func{void}{SetItemData}{\param{const wxTreeItemId\&}{ item}, \param{wxTreeItemData* }{data}}

Sets the item client data.

\pythonnote{wxPython provides the following shortcut method:\par
\indented{2cm}{\begin{twocollist}\itemsep=0pt
\twocolitem{{\bf SetPyData(item, obj)}}{Associate the given Python
Object with the wxTreeItemData for the given item Id.}
\end{twocollist}}
}

\membersection{wxTreeCtrl::SetItemFont}\label{wxtreectrlsetitemfont}

\func{void}{SetItemFont}{\param{const wxTreeItemId\&}{ item}, \param{const wxFont\& }{font}}

Sets the items font. All items in the tree should have the same height to avoid
text clipping, so the fonts height should be the same for all of them,
although font attributes may vary.

\wxheading{See also}

\helpref{SetItemBold}{wxtreectrlsetitembold}

\membersection{wxTreeCtrl::SetItemHasChildren}\label{wxtreectrlsetitemhaschildren}

\func{void}{SetItemHasChildren}{\param{const wxTreeItemId\&}{ item}, \param{bool }{hasChildren = TRUE}}

Force appearance of the button next to the item. This is useful to
allow the user to expand the items which don't have any children now,
but instead adding them only when needed, thus minimizing memory
usage and loading time.

\membersection{wxTreeCtrl::SetItemImage}\label{wxtreectrlsetitemimage}

\func{void}{SetItemImage}{\param{const wxTreeItemId\&}{ item},
 \param{int }{image}, \param{wxTreeItemIcon }{which = wxTreeItemIcon\_Normal}}

Sets the specified item image. See \helpref{GetItemImage}{wxtreectrlgetitemimage}
for the description of the {\it which} parameter.

\membersection{wxTreeCtrl::SetItemSelectedImage}\label{wxtreectrlsetitemselectedimage}

\func{void}{SetItemSelectedImage}{\param{const wxTreeItemId\&}{ item}, \param{int }{selImage}}

Sets the selected item image (this function is obsolete, use {\tt SetItemImage(item, wxTreeItemIcon\_Selected}) instead).

\membersection{wxTreeCtrl::SetItemText}\label{wxtreectrlsetitemtext}

\func{void}{SetItemText}{\param{const wxTreeItemId\&}{ item}, \param{const wxString\& }{text}}

Sets the item label.

\membersection{wxTreeCtrl::SetItemTextColour}\label{wxtreectrlsetitemtextcolour}

\func{void}{SetItemTextColour}{\param{const wxTreeItemId\&}{ item}, \param{const wxColour\& }{col}}

Sets the colour of the items text.

\membersection{wxTreeCtrl::SetStateImageList}\label{wxtreectrlsetstateimagelist}

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

Sets the state image list (from which application-defined state images are taken).
Image list assigned with this method will
{\bf not} be deleted by wxTreeCtrl's destructor, you must delete it yourself.

See also \helpref{AssignStateImageList}{wxtreectrlassignstateimagelist}.

\membersection{wxTreeCtrl::SortChildren}\label{wxtreectrlsortchildren}

\func{void}{SortChildren}{\param{const wxTreeItemId\&}{ item}}

Sorts the children of the given item using
\helpref{OnCompareItems}{wxtreectrloncompareitems} method of wxTreeCtrl. You
should override that method to change the sort order (the default is ascending
alphabetical order).

\wxheading{See also}

\helpref{wxTreeItemData}{wxtreeitemdata}, \helpref{OnCompareItems}{wxtreectrloncompareitems}

\membersection{wxTreeCtrl::Toggle}\label{wxtreectrltoggle}

\func{void}{Toggle}{\param{const wxTreeItemId\&}{ item}}

Toggles the given item between collapsed and expanded states.

\membersection{wxTreeCtrl::Unselect}\label{wxtreectrlunselect}

\func{void}{Unselect}{\void}

Removes the selection from the currently selected item (if any).

\membersection{wxTreeCtrl::UnselectAll}\label{wxtreectrlunselectall}

\func{void}{UnselectAll}{\void}

This function either behaves the same as \helpref{Unselect}{wxtreectrlunselect}
if the control doesn't have wxTR\_MULTIPLE style, or removes the selection from
all items if it does have this style.

\section{\class{wxTreeItemData}}\label{wxtreeitemdata}

wxTreeItemData is some (arbitrary) user class associated with some item. The
main advantage of having this class (compared to the old untyped interface) is
that wxTreeItemData's are destroyed automatically by the tree and, as this
class has virtual dtor, it means that the memory will be automatically
freed. We don't just use wxObject instead of wxTreeItemData because
the size of this class is critical: in any real application, each tree leaf
will have wxTreeItemData associated with it and number of leaves may be
quite big.

Because the objects of this class are deleted by the tree, they should
always be allocated on the heap.

\wxheading{Derived from}

wxTreeItemId

\wxheading{Include files}

<wx/treectrl.h>

\wxheading{See also}

\helpref{wxTreeCtrl}{wxtreectrl}

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

\membersection{wxTreeItemData::wxTreeItemData}\label{wxtreeitemdataconstr}

\func{}{wxTreeItemData}{\void}

Default constructor.

\pythonnote{The wxPython version of this constructor optionally
accepts any Python object as a parameter.  This object is then
associated with the tree item using the wxTreeItemData as a
container.

In addition, the following methods are added in wxPython for accessing
the object:

\indented{2cm}{\begin{twocollist}\itemsep=0pt
\twocolitem{{\bf GetData()}}{Returns a reference to the Python Object}
\twocolitem{{\bf SetData(obj)}}{Associates a new Python Object with the
wxTreeItemData}
\end{twocollist}}
}


\membersection{wxTreeItemData::\destruct{wxTreeItemData}}

\func{void}{\destruct{wxTreeItemData}}{\void}

Virtual destructor.

\membersection{wxTreeItemData::GetId}\label{wxtreeitemdatagetid}

\func{const wxTreeItem\&}{GetId}{\void}

Returns the item associated with this node.

\membersection{wxTreeItemData::SetId}\label{wxtreeitemdatasetid}

\func{void}{SetId}{\param{const wxTreeItemId\&}{ id}}

Sets the item associated with this node.