remove wxTextAttr::CreateFont(); return wxNullFont from GetFont() if we have no font...

[wxWidgets.git] / interface / listbox.h

/////////////////////////////////////////////////////////////////////////////
// Name:        listbox.h
// Purpose:     documentation for wxListBox class
// Author:      wxWidgets team
// RCS-ID:      $Id$
// Licence:     wxWindows license
/////////////////////////////////////////////////////////////////////////////

/**
    @class wxListBox
    @wxheader{listbox.h}

    A listbox is used to select one or more of a list of strings. The
    strings are displayed in a scrolling box, with the selected string(s)
    marked in reverse video. A listbox can be single selection (if an item
    is selected, the previous selection is removed) or multiple selection
    (clicking an item toggles the item on or off independently of other
    selections).

    List box elements are numbered from zero. Their number may be limited
    under some platforms.

    A listbox callback gets an event wxEVT_COMMAND_LISTBOX_SELECTED for single
    clicks, and
    wxEVT_COMMAND_LISTBOX_DOUBLE_CLICKED for double clicks.

    @beginStyleTable
    @style{wxLB_SINGLE}:
           Single-selection list.
    @style{wxLB_MULTIPLE}:
           Multiple-selection list: the user can toggle multiple items on and
           off.
    @style{wxLB_EXTENDED}:
           Extended-selection list: the user can select multiple items using
           the SHIFT key and the mouse or special key combinations.
    @style{wxLB_HSCROLL}:
           Create horizontal scrollbar if contents are too wide (Windows only).
    @style{wxLB_ALWAYS_SB}:
           Always show a vertical scrollbar.
    @style{wxLB_NEEDED_SB}:
           Only create a vertical scrollbar if needed.
    @style{wxLB_SORT}:
           The listbox contents are sorted in alphabetical order.
    @endStyleTable

    @beginEventTable
    @event{EVT_LISTBOX(id, func)}:
           Process a wxEVT_COMMAND_LISTBOX_SELECTED event, when an item on the
           list is selected or the selection changes.
    @event{EVT_LISTBOX_DCLICK(id, func)}:
           Process a wxEVT_COMMAND_LISTBOX_DOUBLECLICKED event, when the
           listbox is double-clicked.
    @endEventTable

    @library{wxcore}
    @category{ctrl}
    @appearance{listbox.png}

    @seealso
    wxChoice, wxComboBox, wxListCtrl, wxCommandEvent
*/
class wxListBox : public wxControlWithItems
{
public:
    //@{
    /**
        Constructor, creating and showing a list box.
        
        @param parent
            Parent window. Must not be @NULL.
        @param id
            Window identifier. The value wxID_ANY indicates a default value.
        @param pos
            Window position.
        @param size
            Window size. If wxDefaultSize is specified then the window is
        sized
            appropriately.
        @param n
            Number of strings with which to initialise the control.
        @param choices
            An array of strings with which to initialise the control.
        @param style
            Window style. See wxListBox.
        @param validator
            Window validator.
        @param name
            Window name.
        
        @see Create(), wxValidator
    */
    wxListBox();
    wxListBox(wxWindow* parent, wxWindowID id,
              const wxPoint& pos = wxDefaultPosition,
              const wxSize& size = wxDefaultSize,
              int n = 0,
              const wxString choices[] = NULL,
              long style = 0,
              const wxValidator& validator = wxDefaultValidator,
              const wxString& name = "listBox");
    wxListBox(wxWindow* parent, wxWindowID id,
              const wxPoint& pos,
              const wxSize& size,
              const wxArrayString& choices,
              long style = 0,
              const wxValidator& validator = wxDefaultValidator,
              const wxString& name = "listBox");
    //@}

    /**
        Destructor, destroying the list box.
    */
    ~wxListBox();

    //@{
    /**
        Creates the listbox for two-step construction. See wxListBox()
        for further details.
    */
    bool Create(wxWindow* parent, wxWindowID id,
                const wxPoint& pos = wxDefaultPosition,
                const wxSize& size = wxDefaultSize,
                int n,
                const wxString choices[] = NULL,
                long style = 0,
                const wxValidator& validator = wxDefaultValidator,
                const wxString& name = "listBox");
    bool Create(wxWindow* parent, wxWindowID id,
                const wxPoint& pos,
                const wxSize& size,
                const wxArrayString& choices,
                long style = 0,
                const wxValidator& validator = wxDefaultValidator,
                const wxString& name = "listBox");
    //@}

    /**
        Deselects an item in the list box.
        
        @param n
            The zero-based item to deselect.
        
        @remarks This applies to multiple selection listboxes only.
    */
    void Deselect(int n);

    /**
        Fill an array of ints with the positions of the currently selected items.
        
        @param selections
            A reference to an wxArrayInt instance that is used to store the result of
        the query.
        
        @returns The number of selections.
        
        @remarks Use this with a multiple selection listbox.
        
        @see wxControlWithItems::GetSelection, wxControlWithItems::GetStringSelection,
             wxControlWithItems::SetSelection
    */
    int GetSelections(wxArrayInt& selections);

    /**
        Returns the item located at @e point, or @c wxNOT_FOUND if there
        is no item located at @e point.
        This function is new since wxWidgets version 2.7.0. It is currently implemented
        for wxMSW, wxMac and wxGTK2
        ports.
        
        @param point
            Point of item (in client coordinates) to obtain
        
        @returns Item located at point, or wxNOT_FOUND if unimplemented or the
                 item does not exist.
    */
    int HitTest(const wxPoint point);

    //@{
    /**
        Insert the given number of strings before the specified position.
        
        @param nItems
            Number of items in the array items
        @param items
            Labels of items to be inserted
        @param pos
            Position before which to insert the items: for example, if pos is 0 the
        items
            will be inserted in the beginning of the listbox
    */
    void InsertItems(int nItems, const wxString items,
                     unsigned int pos);
    void InsertItems(const wxArrayString& nItems,
                     unsigned int pos);
    //@}

    /**
        Determines whether an item is selected.
        
        @param n
            The zero-based item index.
        
        @returns @true if the given item is selected, @false otherwise.
    */
    bool IsSelected(int n);

    //@{
    /**
        Clears the list box and adds the given strings to it.
        
        @param n
            The number of strings to set.
        @param choices
            An array of strings to set.
        @param clientData
            Options array of client data pointers
        
        @remarks You may free the array from the calling program after this
                 function has been called.
    */
    void Set(int n, const wxString* choices, void clientData = NULL);
    void Set(const wxArrayString& choices,
             void clientData = NULL);
    //@}

    //@{
    /**
        Set the specified item to be the first visible item.
        
        @param n
            The zero-based item index.
        @param string
            The string that should be visible.
    */
    void SetFirstItem(int n);
    void SetFirstItem(const wxString& string);
    //@}
};