xmlres.h

wxGTK 是 wxWidgets 的 linux GTK+ (>2.2.3)版本。wxWidgets 是一个跨平台的 GUI 框架

    // Creates a resource from information in the given node
    // (Uses only 'handlerToUse' if != NULL)
    wxObject *CreateResFromNode(wxXmlNode *node, wxObject *parent,
                                wxObject *instance = NULL,
                                wxXmlResourceHandler *handlerToUse = NULL);

    // Helper of Load() and Unload(): returns the URL corresponding to the
    // given file if it's indeed a file, otherwise returns the original string
    // unmodified
    static wxString ConvertFileNameToURL(const wxString& filename);

    // loading resources from archives is impossible without wxFileSystem
#if wxUSE_FILESYSTEM
    // Another helper: detect if the filename is a ZIP or XRS file
    static bool IsArchive(const wxString& filename);
#endif // wxUSE_FILESYSTEM

private:
    long m_version;

    int m_flags;
    wxList m_handlers;
    wxXmlResourceDataRecords m_data;
#if wxUSE_FILESYSTEM
    wxFileSystem m_curFileSystem;
    wxFileSystem& GetCurFileSystem() { return m_curFileSystem; }
#endif

    // domain to pass to translation functions, if any.
    wxChar* m_domain;
    
    friend class wxXmlResourceHandler;
    friend class wxXmlResourceModule;

    static wxXmlSubclassFactoriesList *ms_subclassFactories;

    // singleton instance:
    static wxXmlResource *ms_instance;
};


// This macro translates string identifier (as used in XML resource,
// e.g. <menuitem id="my_menu">...</menuitem>) to integer id that is needed by
// wxWidgets event tables.
// Example:
//    BEGIN_EVENT_TABLE(MyFrame, wxFrame)
//       EVT_MENU(XRCID("quit"), MyFrame::OnQuit)
//       EVT_MENU(XRCID("about"), MyFrame::OnAbout)
//       EVT_MENU(XRCID("new"), MyFrame::OnNew)
//       EVT_MENU(XRCID("open"), MyFrame::OnOpen)
//    END_EVENT_TABLE()

#define XRCID(str_id) \
    wxXmlResource::GetXRCID(wxT(str_id))


// This macro returns pointer to particular control in dialog
// created using XML resources. You can use it to set/get values from
// controls.
// Example:
//    wxDialog dlg;
//    wxXmlResource::Get()->LoadDialog(&dlg, mainFrame, "my_dialog");
//    XRCCTRL(dlg, "my_textctrl", wxTextCtrl)->SetValue(wxT("default value"));

#define XRCCTRL(window, id, type) \
    (wxStaticCast((window).FindWindow(XRCID(id)), type))

// wxXmlResourceHandler is an abstract base class for resource handlers
// capable of creating a control from an XML node.

class WXDLLIMPEXP_XRC wxXmlResourceHandler : public wxObject
{
DECLARE_ABSTRACT_CLASS(wxXmlResourceHandler)
public:
    // Constructor.
    wxXmlResourceHandler();

    // Destructor.
    virtual ~wxXmlResourceHandler() {}

    // Creates an object (menu, dialog, control, ...) from an XML node.
    // Should check for validity.
    // parent is a higher-level object (usually window, dialog or panel)
    // that is often necessary to create the resource.
    // If instance is non-NULL it should not create a new instance via 'new' but
    // should rather use this one, and call its Create method.
    wxObject *CreateResource(wxXmlNode *node, wxObject *parent,
                             wxObject *instance);

    // This one is called from CreateResource after variables
    // were filled.
    virtual wxObject *DoCreateResource() = 0;

    // Returns true if it understands this node and can create
    // a resource from it, false otherwise.
    virtual bool CanHandle(wxXmlNode *node) = 0;

    // Sets the parent resource.
    void SetParentResource(wxXmlResource *res) { m_resource = res; }

protected:
    wxXmlResource *m_resource;
    wxArrayString m_styleNames;
    wxArrayInt m_styleValues;

    // Variables (filled by CreateResource)
    wxXmlNode *m_node;
    wxString m_class;
    wxObject *m_parent, *m_instance;
    wxWindow *m_parentAsWindow;

    // --- Handy methods:

    // Returns true if the node has a property class equal to classname,
    // e.g. <object class="wxDialog">.
    bool IsOfClass(wxXmlNode *node, const wxString& classname);

    // Gets node content from wxXML_ENTITY_NODE
    // The problem is, <tag>content<tag> is represented as
    // wxXML_ENTITY_NODE name="tag", content=""
    //    |-- wxXML_TEXT_NODE or
    //        wxXML_CDATA_SECTION_NODE name="" content="content"
    wxString GetNodeContent(wxXmlNode *node);

    // Check to see if a parameter exists.
    bool HasParam(const wxString& param);

    // Finds the node or returns NULL.
    wxXmlNode *GetParamNode(const wxString& param);

    // Finds the parameter value or returns the empty string.
    wxString GetParamValue(const wxString& param);

    // Add a style flag (e.g. wxMB_DOCKABLE) to the list of flags
    // understood by this handler.
    void AddStyle(const wxString& name, int value);

    // Add styles common to all wxWindow-derived classes.
    void AddWindowStyles();

    // Gets style flags from text in form "flag | flag2| flag3 |..."
    // Only understands flags added with AddStyle
    int GetStyle(const wxString& param = wxT("style"), int defaults = 0);

    // Gets text from param and does some conversions:
    // - replaces \n, \r, \t by respective chars (according to C syntax)
    // - replaces _ by & and __ by _ (needed for _File => &File because of XML)
    // - calls wxGetTranslations (unless disabled in wxXmlResource)
    wxString GetText(const wxString& param, bool translate = true);

    // Returns the XRCID.
    int GetID();

    // Returns the resource name.
    wxString GetName();

    // Gets a bool flag (1, t, yes, on, true are true, everything else is false).
    bool GetBool(const wxString& param, bool defaultv = false);

    // Gets an integer value from the parameter.
    long GetLong(const wxString& param, long defaultv = 0);

    // Gets a float value from the parameter.
    float GetFloat(const wxString& param, float defaultv = 0);

    // Gets colour in HTML syntax (#RRGGBB).
    wxColour GetColour(const wxString& param, const wxColour& defaultv = wxNullColour);

    // Gets the size (may be in dialog units).
    wxSize GetSize(const wxString& param = wxT("size"),
                   wxWindow *windowToUse = NULL);

    // Gets the position (may be in dialog units).
    wxPoint GetPosition(const wxString& param = wxT("pos"));

    // Gets a dimension (may be in dialog units).
    wxCoord GetDimension(const wxString& param, wxCoord defaultv = 0,
                         wxWindow *windowToUse = NULL);

    // Gets a bitmap.
    wxBitmap GetBitmap(const wxString& param = wxT("bitmap"),
                       const wxArtClient& defaultArtClient = wxART_OTHER,
                       wxSize size = wxDefaultSize);

    // Gets an icon.
    wxIcon GetIcon(const wxString& param = wxT("icon"),
                   const wxArtClient& defaultArtClient = wxART_OTHER,
                   wxSize size = wxDefaultSize);

#if wxUSE_ANIMATIONCTRL
    // Gets an animation.
    wxAnimation GetAnimation(const wxString& param = wxT("animation"));
#endif

    // Gets a font.
    wxFont GetFont(const wxString& param = wxT("font"));

    // Sets common window options.
    void SetupWindow(wxWindow *wnd);

    // Creates children.
    void CreateChildren(wxObject *parent, bool this_hnd_only = false);

    // Helper function.
    void CreateChildrenPrivately(wxObject *parent, wxXmlNode *rootnode = NULL);

    // Creates a resource from a node.
    wxObject *CreateResFromNode(wxXmlNode *node,
                                wxObject *parent, wxObject *instance = NULL)
        { return m_resource->CreateResFromNode(node, parent, instance); }

    // helper
#if wxUSE_FILESYSTEM
    wxFileSystem& GetCurFileSystem() { return m_resource->GetCurFileSystem(); }
#endif
};


// Programmer-friendly macros for writing XRC handlers:

#define XRC_ADD_STYLE(style) AddStyle(wxT(#style), style)

#define XRC_MAKE_INSTANCE(variable, classname) \
   classname *variable = NULL; \
   if (m_instance) \
       variable = wxStaticCast(m_instance, classname); \
   if (!variable) \
       variable = new classname;


// FIXME -- remove this $%^#$%#$@# as soon as Ron checks his changes in!!
WXDLLIMPEXP_XRC void wxXmlInitResourceModule();


// This class is used to create instances of XRC "object" nodes with "subclass"
// property. It is _not_ supposed to be used by XRC users, you should instead
// register your subclasses via wxWidgets' RTTI mechanism. This class is useful
// only for language bindings developer who need a way to implement subclassing
// in wxWidgets ports that don't support wxRTTI (e.g. wxPython).
class WXDLLIMPEXP_XRC wxXmlSubclassFactory
{
public:
    // Try to create instance of given class and return it, return NULL on
    // failure:
    virtual wxObject *Create(const wxString& className) = 0;
    virtual ~wxXmlSubclassFactory() {}
};


/* -------------------------------------------------------------------------
   Backward compatibility macros. Do *NOT* use, they may disappear in future
   versions of the XRC library!
   ------------------------------------------------------------------------- */
#if WXWIN_COMPATIBILITY_2_4
    #define ADD_STYLE         XRC_ADD_STYLE
    #define wxTheXmlResource  wxXmlResource::Get()
    #define XMLID             XRCID
    #define XMLCTRL           XRCCTRL
    #define GetXMLID          GetXRCID
#endif

#endif // wxUSE_XRC

#endif // _WX_XMLRES_H_