wxWidgets/interface/htmllbox.h

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

/**
    @class wxHtmlListBox
    @wxheader{htmllbox.h}

    wxHtmlListBox is an implementation of wxVListBox which
    shows HTML content in the listbox rows. This is still an abstract base class
    and you will need to derive your own class from it (see htlbox sample for the
    example) but you will only need to override a single
    wxHtmlListBox::OnGetItem function.

    @library{wxhtml}
    @category{ctrl}
    @appearance{htmllistbox.png}

    @seealso
    wxSimpleHtmlListBox
*/
class wxHtmlListBox : public wxVListBox
{
public:
    //@{
    /**
        Default constructor, you must call Create()
        later.
    */
    wxHtmlListBox(wxWindow* parent, wxWindowID id = wxID_ANY,
                  const wxPoint& pos = wxDefaultPosition,
                  const wxSize& size = wxDefaultSize,
                  long style = 0,
                  const wxString& name = wxHtmlListBoxNameStr);
    wxHtmlListBox();
    //@}

    /**
        Destructor cleans up whatever resources we use.
    */
    ~wxHtmlListBox();

    /**
        Creates the control and optionally sets the initial number of items in it
        (it may also be set or changed later with
        wxVListBox::SetItemCount).
        There are no special styles defined for wxHtmlListBox, in particular the
        wxListBox styles (with the exception of @c wxLB_MULTIPLE) can not be used here.
        Returns @true on success or @false if the control couldn't be created
    */
    bool Create(wxWindow* parent, wxWindowID id = wxID_ANY,
                const wxPoint& pos = wxDefaultPosition,
                const wxSize& size = wxDefaultSize,
                long style = 0,
                const wxString& name = wxHtmlListBoxNameStr);

    //@{
    /**
        Returns the wxFileSystem used by the HTML parser of
        this object. The file system object is used to resolve the paths in HTML
        fragments displayed in the control and you should use
        wxFileSystem::ChangePathTo if you use
        relative paths for the images or other resources embedded in your HTML.
    */
    wxFileSystem GetFileSystem() const;
    const wxFileSystem GetFileSystem() const;
    //@}

    /**
        This virtual function may be overridden to change the appearance of the
        background of the selected cells in the same way as
        GetSelectedTextColour().
        It should be rarely, if ever, used because
        wxVListBox::SetSelectionBackground allows to
        change the selection background for all cells at once and doing anything more
        fancy is probably going to look strangely.
        
        @see GetSelectedTextColour()
    */
    wxColour GetSelectedTextBgColour(const wxColour& colBg) const;

    /**
        This virtual function may be overridden to customize the appearance of the
        selected cells. It is used to determine how the colour @a colFg is going to
        look inside selection. By default all original colours are completely ignored
        and the standard, system-dependent, selection colour is used but the program
        may wish to override this to achieve some custom appearance.
        
        @see GetSelectedTextBgColour(),
             wxVListBox::SetSelectionBackground, wxSystemSettings::GetColour
    */
    wxColour GetSelectedTextColour(const wxColour& colFg) const;

    /**
        This method must be implemented in the derived class and should return
        the body (i.e. without @c html nor @c body tags) of the HTML fragment
        for the given item.
        Note that this function should always return a text fragment for the @a n item
        which renders with the same height both when it is selected and when it's not:
        i.e. if you call, inside your OnGetItem() implementation, @c IsSelected(n) to
        make the items appear differently when they are selected, then you should make
        sure
        that the returned HTML fragment will render with the same height or else you'll
        see some artifacts when the user selects an item.
    */
    wxString OnGetItem(size_t n) const;

    /**
        This function may be overridden to decorate HTML returned by
        OnGetItem().
    */
    wxString OnGetItemMarkup(size_t n) const;

    /**
        Called when the user clicks on hypertext link. Does nothing by default.
        Overloading this method is deprecated; intercept the event instead.
        
        @param n
            Index of the item containing the link.
        @param link
            Description of the link.
        
        @see See also wxHtmlLinkInfo.
    */
    virtual void OnLinkClicked(size_t n, const wxHtmlLinkInfo& link);
};


/**
    @class wxSimpleHtmlListBox
    @wxheader{htmllbox.h}

    wxSimpleHtmlListBox is an implementation of wxHtmlListBox which
    shows HTML content in the listbox rows.

    Unlike wxHtmlListBox, this is not an abstract class and thus it
    has the advantage that you can use it without deriving your own class from it.
    However, it also has the disadvantage that this is not a virtual control and
    thus it's not
    well-suited for those cases where you need to show a huge number of items:
    every time you
    add/insert a string, it will be stored internally and thus will take memory.

    The interface exposed by wxSimpleHtmlListBox fully implements the
    wxControlWithItems interface, thus you should refer to
    wxControlWithItems's documentation for the API reference
    for adding/removing/retrieving items in the listbox.
    Also note that the wxVListBox::SetItemCount function is
    @c protected in wxSimpleHtmlListBox's context so that you cannot call it
    directly,
    wxSimpleHtmlListBox will do it for you.

    Note: in case you need to append a lot of items to the control at once, make
    sure to use the
    @ref wxControlWithItems::append "Append(const wxArrayString )" function.

    Thus the only difference between a wxListBox and a wxSimpleHtmlListBox
    is that the latter stores strings which can contain HTML fragments (see the
    list of
    @ref overview_htmltagssupported "tags supported by wxHTML").

    Note that the HTML strings you fetch to wxSimpleHtmlListBox should not contain
    the @c html
    or @c body tags.

    @beginStyleTable
    @style{wxHLB_DEFAULT_STYLE}:
           The default style: wxBORDER_SUNKEN
    @style{wxHLB_MULTIPLE}:
           Multiple-selection list: the user can toggle multiple items on and
           off.
    @endStyleTable

    @library{wxhtml}
    @category{ctrl}
    @appearance{simplehtmllistbox.png}

    @seealso
    wxSimpleHtmlListBox::Create
*/
class wxSimpleHtmlListBox : public wxHtmlListBox
{
public:
    //@{
    /**
        Default constructor, you must call Create()
        later.
    */
    wxHtmlListBox(wxWindow* parent, wxWindowID id,
                  const wxPoint& pos = wxDefaultPosition,
                  const wxSize& size = wxDefaultSize,
                  int n = 0,
                  const wxString choices[] = NULL,
                  long style = wxHLB_DEFAULT_STYLE,
                  const wxValidator& validator = wxDefaultValidator,
                  const wxString& name = "simpleHtmlListBox");
    wxHtmlListBox(wxWindow* parent, wxWindowID id,
                  const wxPoint& pos,
                  const wxSize& size,
                  const wxArrayString& choices,
                  long style = wxHLB_DEFAULT_STYLE,
                  const wxValidator& validator = wxDefaultValidator,
                  const wxString& name = "simpleHtmlListBox");
    See also
    wxSimpleHtmlListBox::Create

    wxSimpleHtmlListBox();
    //@}

    /**
        Frees the array of stored items and relative client data.
    */
    ~wxSimpleHtmlListBox();

    //@{
    /**
        Creates the HTML listbox for two-step construction.
        See wxSimpleHtmlListBox() 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 = wxHLB_DEFAULT_STYLE,
                const wxValidator& validator = wxDefaultValidator,
                const wxString& name = "simpleHtmlListBox");
    bool Create(wxWindow* parent, wxWindowID id,
                const wxPoint& pos,
                const wxSize& size,
                const wxArrayString& choices,
                long style = wxHLB_DEFAULT_STYLE,
                const wxValidator& validator = wxDefaultValidator,
                const wxString& name = "simpleHtmlListBox");
    //@}
};