wxWidgets/interface/wx/xrc/xmlres.h

/////////////////////////////////////////////////////////////////////////////
// Name:        xrc/xmlres.h
// Purpose:     interface of wxXmlResource
// Author:      wxWidgets team
// RCS-ID:      $Id$
// Licence:     wxWindows license
/////////////////////////////////////////////////////////////////////////////

/**
    Flags which can be used with wxXmlResource::wxXmlResource.
*/
enum wxXmlResourceFlags
{
    /** Translatable strings will be translated via _(). */
    wxXRC_USE_LOCALE     = 1,

    /** Subclass property of object nodes will be ignored (useful for previews in XRC editors). */
    wxXRC_NO_SUBCLASSING = 2,

    /** Prevent the XRC files from being reloaded from disk in case they have been modified there
        since being last loaded (may slightly speed up loading them). */
    wxXRC_NO_RELOADING   = 4
};


/**
    @class wxXmlResource

    This is the main class for interacting with the XML-based resource system.

    The class holds XML resources from one or more .xml files, binary files or zip
    archive files.

    @see @ref overview_xrc, @ref overview_xrcformat

    @library{wxxrc}
    @category{xrc}
*/
class wxXmlResource : public wxObject
{
public:
    /**
        Constructor.

        @param filemask
            The XRC file, archive file, or wildcard specification that will be
            used to load all resource files inside a zip archive.
        @param flags
            One or more value of the ::wxXmlResourceFlags enumeration.
        @param domain
            The name of the gettext catalog to search for translatable strings.
            By default all loaded catalogs will be searched.
            This provides a way to allow the strings to only come from a specific catalog.
    */
    wxXmlResource(const wxString& filemask,
                  int flags = wxXRC_USE_LOCALE,
                  const wxString& domain = wxEmptyString);

    /**
        Constructor.

        @param flags
            One or more value of the ::wxXmlResourceFlags enumeration.
        @param domain
            The name of the gettext catalog to search for translatable strings.
            By default all loaded catalogs will be searched.
            This provides a way to allow the strings to only come from a specific catalog.
    */
    wxXmlResource(int flags = wxXRC_USE_LOCALE,
                  const wxString& domain = wxEmptyString);

    /**
        Destructor.
    */
    virtual ~wxXmlResource();

    /**
        Initializes only a specific handler (or custom handler).
        Convention says that the handler name is equal to the control's name plus
        'XmlHandler', for example wxTextCtrlXmlHandler, wxHtmlWindowXmlHandler.

        The XML resource compiler (wxxrc) can create include file that contains
        initialization code for all controls used within the resource.
        Note that this handler must be allocated on the heap, since it will be
        deleted by ClearHandlers() later.
    */
    void AddHandler(wxXmlResourceHandler* handler);

    /**
        Attaches an unknown control to the given panel/window/dialog.
        Unknown controls are used in conjunction with \<object class="unknown"\>.
    */
    bool AttachUnknownControl(const wxString& name,
                              wxWindow* control,
                              wxWindow* parent = NULL);

    /**
        Removes all handlers and deletes them (this means that any handlers
        added using AddHandler() must be allocated on the heap).
    */
    void ClearHandlers();

    /**
        Compares the XRC version to the argument.

        Returns -1 if the XRC version is less than the argument,
        +1 if greater, and 0 if they are equal.
    */
    int CompareVersion(int major, int minor, int release, int revision) const;

    /**
        Returns a string ID corresponding to the given numeric ID.

        The string returned is such that calling GetXRCID() with it as
        parameter yields @a numId. If there is no string identifier
        corresponding to the given numeric one, an empty string is returned.

        Notice that, unlike GetXRCID(), this function is slow as it checks all
        of the identifiers used in XRC.

        @since 2.9.0
     */
    static wxString FindXRCIDById(int numId);

    /**
        Gets the global resources object or creates one if none exists.
    */
    static wxXmlResource* Get();

    /**
        Returns the domain (message catalog) that will be used to load
        translatable strings in the XRC.
    */
    const wxString& GetDomain() const;

    /**
        Returns flags, which may be a bitlist of ::wxXmlResourceFlags
        enumeration values.
    */
    int GetFlags() const;

    /**
        Returns version information (a.b.c.d = d + 256*c + 2562*b + 2563*a).
    */
    long GetVersion() const;

    /**
        Returns a numeric ID that is equivalent to the string ID used in an XML resource.

        If an unknown @a str_id is requested (i.e. other than wxID_XXX or integer),
        a new record is created which associates the given string with a number.

        If @a value_if_not_found is @c wxID_NONE, the number is obtained via
        wxNewId(). Otherwise @a value_if_not_found is used.
        Macro @c XRCID(name) is provided for convenient use in event tables.
    */
    static int GetXRCID(const wxString& str_id, int value_if_not_found = wxID_NONE);

    /**
        Initializes handlers for all supported controls/windows.

        This will make the executable quite big because it forces linking against
        most of the wxWidgets library.
    */
    void InitAllHandlers();

    /**
        Loads resources from XML files that match given filemask.
        This method understands VFS (see filesys.h).
    */
    bool Load(const wxString& filemask);

    /**
        Loads a bitmap resource from a file.
    */
    wxBitmap LoadBitmap(const wxString& name);

    /**
        Loads a dialog. @a parent points to parent window (if any).
    */
    wxDialog* LoadDialog(wxWindow* parent, const wxString& name);

    /**
        Loads a dialog. @a parent points to parent window (if any).

        This form is used to finish creation of an already existing instance (the main
        reason for this is that you may want to use derived class with a new event table).
        Example:

        @code
          MyDialog dlg;
          wxTheXmlResource->LoadDialog(&dlg, mainFrame, "my_dialog");
          dlg.ShowModal();
        @endcode
    */
    bool LoadDialog(wxDialog* dlg, wxWindow* parent, const wxString& name);

    /**
        Loads a frame.
    */
    bool LoadFrame(wxFrame* frame, wxWindow* parent,
                   const wxString& name);

    /**
        Loads an icon resource from a file.
    */
    wxIcon LoadIcon(const wxString& name);

    /**
        Loads menu from resource. Returns @NULL on failure.
    */
    wxMenu* LoadMenu(const wxString& name);

    //@{
    /**
        Loads a menubar from resource. Returns @NULL on failure.
    */
    wxMenuBar* LoadMenuBar(wxWindow* parent, const wxString& name);
    wxMenuBar* LoadMenuBar(const wxString& name);
    //@}

    //@{
    /**
        Load an object from the resource specifying both the resource name and the
        class name.

        The first overload lets you load nonstandard container windows and returns
        @NULL on failure. The second one lets you finish the creation of an existing
        instance and returns @false on failure.
    */
    wxObject* LoadObject(wxWindow* parent, const wxString& name,
                         const wxString& classname);
    bool LoadObject(wxObject* instance, wxWindow* parent,
                    const wxString& name,
                    const wxString& classname);
    //@}

    /**
        Loads a panel. @a panel points to parent window (if any).
    */
    wxPanel* LoadPanel(wxWindow* parent, const wxString& name);

    /**
        Loads a panel. @a panel points to parent window (if any).
        This form is used to finish creation of an already existing instance.
    */
    bool LoadPanel(wxPanel* panel, wxWindow* parent, const wxString& name);

    /**
        Loads a toolbar.
    */
    wxToolBar* LoadToolBar(wxWindow* parent, const wxString& name);

    /**
        Sets the global resources object and returns a pointer to the previous one
        (may be @NULL).
    */
    static wxXmlResource* Set(wxXmlResource* res);

    /**
        Sets the domain (message catalog) that will be used to load
        translatable strings in the XRC.
    */
    void SetDomain(const wxString& domain);

    /**
        Sets flags (bitlist of ::wxXmlResourceFlags enumeration values).
    */
    void SetFlags(int flags);

    /**
        This function unloads a resource previously loaded by Load().

        Returns @true if the resource was successfully unloaded and @false if it
        hasn't been found in the list of loaded resources.
    */
    bool Unload(const wxString& filename);
};



/**
    @class wxXmlResourceHandler

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

    See @ref overview_xrc for details.

    @library{wxxrc}
    @category{xrc}
*/
class wxXmlResourceHandler : public wxObject
{
public:
    /**
        Default constructor.
    */
    wxXmlResourceHandler();

    /**
        Destructor.
    */
    virtual ~wxXmlResourceHandler();

    /**
        Creates an object (menu, dialog, control, ...) from an XML node.
        Should check for validity. @a parent is a higher-level object
        (usually window, dialog or panel) that is often necessary to
        create the resource.

        If @b 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);

    /**
        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.

        @note
        You must not call any wxXmlResourceHandler methods except IsOfClass()
        from this method! The instance is not yet initialized with node data
        at the time CanHandle() is called and it is only safe to operate on
        node directly or to call IsOfClass().
    */
    virtual bool CanHandle(wxXmlNode* node) = 0;

    /**
        Sets the parent resource.
    */
    void SetParentResource(wxXmlResource* res);


protected:

    /**
        Add a style flag (e.g. @c 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();

    /**
        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);

    /**
        Creates an animation (see wxAnimation) from the filename specified in @a param.
    */
    wxAnimation GetAnimation(const wxString& param = wxT("animation"));

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

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

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

    /**
        Returns the current file system.
    */
    wxFileSystem& GetCurFileSystem();

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

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

    /**
        Returns the XRCID.
    */
    int GetID();

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

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

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

    /**
        Gets node content from wxXML_ENTITY_NODE.
    */
    wxString GetNodeContent(wxXmlNode* node);

    /**
        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);

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

    /**
        Gets the size (may be in dialog units).
    */
    wxSize GetSize(const wxString& param = "size", wxWindow* windowToUse = 0);

    /**
        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 characters (according to C syntax)
        - replaces @c $ by @c  and @c $$ by @c $ (needed for @c _File to @c File
          translation because of XML syntax)
        - calls wxGetTranslations (unless disabled in wxXmlResource)
    */
    wxString GetText(const wxString& param, bool translate = true);

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

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

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