///////////////////////////////////////////////////////////////////////////// // Name: docview.h // Purpose: interface of various doc/view framework classes // Author: wxWidgets team // RCS-ID: $Id$ // Licence: wxWindows licence ///////////////////////////////////////////////////////////////////////////// /** @class wxDocTemplate The wxDocTemplate class is used to model the relationship between a document class and a view class. @library{wxcore} @category{docview} @see @ref overview_docview_wxdoctemplate, wxDocument, wxView */ class wxDocTemplate : public wxObject { public: /** Constructor. Create instances dynamically near the start of your application after creating a wxDocManager instance, and before doing any document or view operations. @param manager The document manager object which manages this template. @param descr A short description of what the template is for. This string will be displayed in the file filter list of Windows file selectors. @param filter An appropriate file filter such as "*.txt". @param dir The default directory to use for file selectors. @param ext The default file extension (such as "txt"). @param docTypeName A name that should be unique for a given type of document, used for gathering a list of views relevant to a particular document. @param viewTypeName A name that should be unique for a given view. @param docClassInfo A pointer to the run-time document class information as returned by the wxCLASSINFO() macro, e.g. wxCLASSINFO(MyDocumentClass). If this is not supplied, you will need to derive a new wxDocTemplate class and override the CreateDocument() member to return a new document instance on demand. @param viewClassInfo A pointer to the run-time view class information as returned by the wxCLASSINFO() macro, e.g. wxCLASSINFO(MyViewClass). If this is not supplied, you will need to derive a new wxDocTemplate class and override the CreateView() member to return a new view instance on demand. @param flags A bit list of the following: - wxTEMPLATE_VISIBLE - The template may be displayed to the user in dialogs. - wxTEMPLATE_INVISIBLE - The template may not be displayed to the user in dialogs. - wxDEFAULT_TEMPLATE_FLAGS - Defined as wxTEMPLATE_VISIBLE. @beginWxPerlOnly In wxPerl @a docClassInfo and @a viewClassInfo can be either @c Wx::ClassInfo objects or strings containing the name of the perl packages which are to be used as @c Wx::Document and @c Wx::View classes (they must have a constructor named new); as an example: - Wx::DocTemplate->new(docmgr, descr, filter, dir, ext, docTypeName, viewTypeName, docClassInfo, viewClassInfo, flags): will construct document and view objects from the class information. - Wx::DocTemplate->new(docmgr, descr, filter, dir, ext, docTypeName, viewTypeName, docClassName, viewClassName, flags): will construct document and view objects from perl packages. - Wx::DocTemplate->new(docmgr, descr, filter, dir, ext, docTypeName, viewTypeName): in this case @c Wx::DocTemplate::CreateDocument() and @c Wx::DocTemplate::CreateView() must be overridden @endWxPerlOnly */ wxDocTemplate(wxDocManager* manager, const wxString& descr, const wxString& filter, const wxString& dir, const wxString& ext, const wxString& docTypeName, const wxString& viewTypeName, wxClassInfo* docClassInfo = 0, wxClassInfo* viewClassInfo = 0, long flags = wxTEMPLATE_VISIBLE); /** Destructor. */ virtual ~wxDocTemplate(); /** Creates a new instance of the associated document class. If you have not supplied a wxClassInfo parameter to the template constructor, you will need to override this function to return an appropriate document instance. This function calls InitDocument() which in turns calls wxDocument::OnCreate(). */ virtual wxDocument* CreateDocument(const wxString& path, long flags = 0); /** Creates a new instance of the associated view class. If you have not supplied a wxClassInfo parameter to the template constructor, you will need to override this function to return an appropriate view instance. If the new view initialization fails, it must call wxDocument::RemoveView() for consistency with the default behaviour of this function. */ virtual wxView* CreateView(wxDocument* doc, long flags = 0); /** This function implements the default (very primitive) format detection which checks if the extension is that of the template. @param path The path to be checked against the template. */ virtual bool FileMatchesTemplate(const wxString& path); /** Returns the default file extension for the document data, as passed to the document template constructor. */ wxString GetDefaultExtension() const; /** Returns the text description of this template, as passed to the document template constructor. */ wxString GetDescription() const; /** Returns the default directory, as passed to the document template constructor. */ wxString GetDirectory() const; /** Returns the run-time class information that allows document instances to be constructed dynamically, as passed to the document template constructor. */ wxClassInfo* GetDocClassInfo() const; /** Returns a pointer to the document manager instance for which this template was created. */ wxDocManager* GetDocumentManager() const; /** Returns the document type name, as passed to the document template constructor. */ virtual wxString GetDocumentName() const; /** Returns the file filter, as passed to the document template constructor. */ wxString GetFileFilter() const; /** Returns the flags, as passed to the document template constructor. */ long GetFlags() const; /** Returns the run-time class information that allows view instances to be constructed dynamically, as passed to the document template constructor. */ wxClassInfo* GetViewClassInfo() const; /** Returns the view type name, as passed to the document template constructor. */ virtual wxString GetViewName() const; /** Initialises the document, calling wxDocument::OnCreate(). This is called from CreateDocument(). If you override this method, notice that you must @em delete the @a doc if its initialization fails for consistency with the default behaviour. @param doc The document to initialize. @param path The associated file path. @param flags Flags passed to CreateDocument(). @return @true if the initialization was successful or @false if it failed in which case @a doc should be deleted by this function. */ virtual bool InitDocument(wxDocument* doc, const wxString& path, long flags = 0); /** Returns @true if the document template can be shown in user dialogs, @false otherwise. */ bool IsVisible() const; /** Sets the default file extension. */ void SetDefaultExtension(const wxString& ext); /** Sets the template description. */ void SetDescription(const wxString& descr); /** Sets the default directory. */ void SetDirectory(const wxString& dir); /** Sets the pointer to the document manager instance for which this template was created. Should not be called by the application. */ void SetDocumentManager(wxDocManager* manager); /** Sets the file filter. */ void SetFileFilter(const wxString& filter); /** Sets the internal document template flags (see the constructor description for more details). */ void SetFlags(long flags); /** The default extension for files of this type. */ wxString m_defaultExt; /** A short description of this template. */ wxString m_description; /** The default directory for files of this type. */ wxString m_directory; /** Run-time class information that allows document instances to be constructed dynamically. */ wxClassInfo* m_docClassInfo; /** The named type of the document associated with this template. */ wxString m_docTypeName; /** A pointer to the document manager for which this template was created. */ wxDocTemplate* m_documentManager; /** The file filter (such as "*.txt") to be used in file selector dialogs. */ wxString m_fileFilter; /** The flags passed to the constructor. */ long m_flags; /** Run-time class information that allows view instances to be constructed dynamically. */ wxClassInfo* m_viewClassInfo; /** The named type of the view associated with this template. */ wxString m_viewTypeName; }; /** @class wxDocManager The wxDocManager class is part of the document/view framework supported by wxWidgets, and cooperates with the wxView, wxDocument and wxDocTemplate classes. @library{wxcore} @category{docview} @see @ref overview_docview_wxdocmanager, wxDocument, wxView, wxDocTemplate, wxFileHistory */ class wxDocManager : public wxEvtHandler { public: /** Constructor. Create a document manager instance dynamically near the start of your application before doing any document or view operations. If @a initialize is @true, the Initialize() function will be called to create a default history list object. If you derive from wxDocManager, you may wish to call the base constructor with @false, and then call Initialize() in your own constructor, to allow your own Initialize() or OnCreateFileHistory functions to be called. @param flags Currently unused. @param initialize Indicates whether Initialize() should be called by this ctor. */ wxDocManager(long flags = 0, bool initialize = true); /** Destructor. */ virtual ~wxDocManager(); /** Sets the current view. */ virtual void ActivateView(wxView* doc, bool activate = true); /** Adds the document to the list of documents. */ void AddDocument(wxDocument* doc); /** Adds a file to the file history list, if we have a pointer to an appropriate file menu. */ virtual void AddFileToHistory(const wxString& filename); /** Adds the template to the document manager's template list. */ void AssociateTemplate(wxDocTemplate* temp); /** Closes the specified document. If @a force is @true, the document is closed even if it has unsaved changes. @param doc The document to close, must be non-@NULL. @param force If @true, close the document even if wxDocument::Close() returns @false. @return @true if the document was closed or @false if closing it was cancelled by user (only in @a force = @false case). */ bool CloseDocument(wxDocument *doc, bool force = false); /** Closes all currently opened documents. @see CloseDocument() */ bool CloseDocuments(bool force = true); /** Creates a new document. This function can either create a document corresponding to a new file or to an already existing one depending on whether @c wxDOC_NEW is specified in the @a flags. By default, this function asks the user for the type of document to open and the path to its file if it's not specified, i.e. if @a path is empty. Specifying @c wxDOC_SILENT flag suppresses any prompts and means that the @a path must be non-empty and there must be a registered document template handling the extension of this file, otherwise a warning message is logged and the function returns @NULL. Notice that @c wxDOC_SILENT can be combined with @c wxDOC_NEW, however in this case the @a path must still be specified, even if the file with this path typically won't exist. Finally notice that if this document manager was configured to allow only a limited number of simultaneously opened documents using SetMaxDocsOpen(), this function will try to close the oldest existing document if this number was reached before creating a new document. And if closing the old document fails (e.g. because it was vetoed by user), this function fails as well. @param path Path to a file or an empty string. If the path is empty, the user will be asked to select it (thus, this is incompatible with the use of @c wxDOC_SILENT). The file should exist unless @a flags includes @c wxDOC_NEW. @param flags By default, none. May include @c wxDOC_NEW to indicate that the new document corresponds to a new file and not an existing one and @c wxDOC_SILENT to suppress any dialogs asking the user about the file path and type. @return a new document object or @NULL on failure. */ virtual wxDocument* CreateDocument(const wxString& path, long flags = 0); /** Creates an empty new document. This is equivalent to calling CreateDocument() with @c wxDOC_NEW flags and without the file name. */ wxDocument *CreateNewDocument(); /** Creates a new view for the given document. If more than one view is allowed for the document (by virtue of multiple templates mentioning the same document type), a choice of view is presented to the user. */ virtual wxView* CreateView(wxDocument* doc, long flags = 0); /** Removes the template from the list of templates. */ void DisassociateTemplate(wxDocTemplate* temp); /** Appends the files in the history list to all menus managed by the file history object. */ virtual void FileHistoryAddFilesToMenu(); /** Appends the files in the history list to the given @a menu only. */ virtual void FileHistoryAddFilesToMenu(wxMenu* menu); /** Loads the file history from a config object. @see wxConfigBase */ virtual void FileHistoryLoad(const wxConfigBase& config); /** Removes the given menu from the list of menus managed by the file history object. */ virtual void FileHistoryRemoveMenu(wxMenu* menu); /** Saves the file history into a config object. This must be called explicitly by the application. @see wxConfigBase */ virtual void FileHistorySave(wxConfigBase& resourceFile); /** Use this menu for appending recently-visited document filenames, for convenient access. Calling this function with a valid menu pointer enables the history list functionality. @note You can add multiple menus using this function, to be managed by the file history object. */ virtual void FileHistoryUseMenu(wxMenu* menu); /** Given a path, try to find template that matches the extension. This is only an approximate method of finding a template for creating a document. */ virtual wxDocTemplate* FindTemplateForPath(const wxString& path); /** Returns the document associated with the currently active view (if any). */ wxDocument* GetCurrentDocument() const; /** Returns the currently active view */ virtual wxView* GetCurrentView() const; /** Returns a reference to the list of documents. */ wxList& GetDocuments(); /** Returns a pointer to file history. */ virtual wxFileHistory* GetFileHistory() const; /** Returns the number of files currently stored in the file history. */ virtual size_t GetHistoryFilesCount() const; /** Returns the directory last selected by the user when opening a file. Initially empty. */ wxString GetLastDirectory() const; /** Returns the number of documents that can be open simultaneously. */ int GetMaxDocsOpen() const; /** Returns a reference to the list of associated templates. */ wxList& GetTemplates(); /** Create the frame used for print preview. This method can be overridden if you need to change the behaviour or appearance of the preview window. By default, a standard wxPreviewFrame is created. @since 2.9.1 @param preview The associated preview object. @param parent The parent window for the frame. @param title The suggested title for the print preview frame. @return A new print preview frame, must not return @NULL. */ virtual wxPreviewFrame* CreatePreviewFrame(wxPrintPreviewBase* preview, wxWindow* parent, const wxString& title); /** Initializes data; currently just calls OnCreateFileHistory(). Some data cannot always be initialized in the constructor because the programmer must be given the opportunity to override functionality. If OnCreateFileHistory() was called from the constructor, an overridden virtual OnCreateFileHistory() would not be called due to C++'s 'interesting' constructor semantics. In fact Initialize() @e is called from the wxDocManager constructor, but this can be vetoed by passing @false to the second argument, allowing the derived class's constructor to call Initialize(), possibly calling a different OnCreateFileHistory() from the default. The bottom line: if you're not deriving from Initialize(), forget it and construct wxDocManager with no arguments. */ virtual bool Initialize(); /** Return a string containing a suitable default name for a new document. By default this is implemented by appending an integer counter to the string @b unnamed but can be overridden in the derived classes to do something more appropriate. */ virtual wxString MakeNewDocumentName(); /** A hook to allow a derived class to create a different type of file history. Called from Initialize(). */ virtual wxFileHistory* OnCreateFileHistory(); /** Closes and deletes the currently active document. */ void OnFileClose(wxCommandEvent& event); /** Closes and deletes all the currently opened documents. */ void OnFileCloseAll(wxCommandEvent& event); /** Creates a document from a list of templates (if more than one template). */ void OnFileNew(wxCommandEvent& event); /** Creates a new document and reads in the selected file. */ void OnFileOpen(wxCommandEvent& event); /** Reverts the current document by calling wxDocument::Revert() for the current document. */ void OnFileRevert(wxCommandEvent& event); /** Saves the current document by calling wxDocument::Save() for the current document. */ void OnFileSave(wxCommandEvent& event); /** Calls wxDocument::SaveAs() for the current document. */ void OnFileSaveAs(wxCommandEvent& event); /** Removes the document from the list of documents. */ void RemoveDocument(wxDocument* doc); /** Under Windows, pops up a file selector with a list of filters corresponding to document templates. The wxDocTemplate corresponding to the selected file's extension is returned. On other platforms, if there is more than one document template a choice list is popped up, followed by a file selector. This function is used in CreateDocument(). @beginWxPerlOnly In wxPerl @a templates is a reference to a list of templates. If you override this method in your document manager it must return two values, eg: @code (doctemplate, path) = My::DocManager->SelectDocumentPath(...); @endcode @endWxPerlOnly */ virtual wxDocTemplate* SelectDocumentPath(wxDocTemplate** templates, int noTemplates, wxString& path, long flags, bool save = false); /** Returns a document template by asking the user (if there is more than one template). This function is used in CreateDocument(). @param templates Pointer to an array of templates from which to choose a desired template. @param noTemplates Number of templates being pointed to by the templates pointer. @param sort If more than one template is passed in in templates, then this parameter indicates whether the list of templates that the user will have to choose from is sorted or not when shown the choice box dialog. Default is @false. @beginWxPerlOnly In wxPerl @a templates is a reference to a list of templates. @endWxPerlOnly */ virtual wxDocTemplate* SelectDocumentType(wxDocTemplate** templates, int noTemplates, bool sort = false); /** Returns a document template by asking the user (if there is more than one template), displaying a list of valid views. This function is used in CreateView(). The dialog normally will not appear because the array of templates only contains those relevant to the document in question, and often there will only be one such. @param templates Pointer to an array of templates from which to choose a desired template. @param noTemplates Number of templates being pointed to by the templates pointer. @param sort If more than one template is passed in in templates, then this parameter indicates whether the list of templates that the user will have to choose from is sorted or not when shown the choice box dialog. Default is @false. @beginWxPerlOnly In wxPerl @a templates is a reference to a list of templates. @endWxPerlOnly */ virtual wxDocTemplate* SelectViewType(wxDocTemplate** templates, int noTemplates, bool sort = false); /** Sets the directory to be displayed to the user when opening a file. Initially this is empty. */ void SetLastDirectory(const wxString& dir); /** Sets the maximum number of documents that can be open at a time. By default, this is @c INT_MAX, i.e. the number of documents is unlimited. If you set it to 1, existing documents will be saved and deleted when the user tries to open or create a new one (similar to the behaviour of Windows Write, for example). Allowing multiple documents gives behaviour more akin to MS Word and other Multiple Document Interface applications. */ void SetMaxDocsOpen(int n); /** The currently active view. */ wxView* m_currentView; /** Stores the integer to be used for the next default document name. */ int m_defaultDocumentNameCounter; /** A list of all documents. */ wxList m_docs; /** A pointer to an instance of wxFileHistory, which manages the history of recently-visited files on the File menu. */ wxFileHistory* m_fileHistory; /** Stores the flags passed to the constructor. */ long m_flags; /** The directory last selected by the user when opening a file. */ wxFileHistory* m_fileHistory; /** Stores the maximum number of documents that can be opened before existing documents are closed. By default, this is 10,000. */ int m_maxDocsOpen; }; /** @class wxView The view class can be used to model the viewing and editing component of an application's file-based data. It is part of the document/view framework supported by wxWidgets, and cooperates with the wxDocument, wxDocTemplate and wxDocManager classes. @library{wxcore} @category{docview} @see @ref overview_docview_wxview, wxDocument, wxDocTemplate, wxDocManager */ class wxView : public wxEvtHandler { public: /** Constructor. Define your own default constructor to initialize application-specific data. */ wxView(); /** Destructor. Removes itself from the document's list of views. */ virtual ~wxView(); /** Call this from your view frame's wxDocChildFrame::OnActivate() member to tell the framework which view is currently active. If your windowing system doesn't call wxDocChildFrame::OnActivate(), you may need to call this function from any place where you know the view must be active, and the framework will need to get the current view. The prepackaged view frame wxDocChildFrame calls Activate() from its wxDocChildFrame::OnActivate() member. This function calls OnActivateView(). */ virtual void Activate(bool activate); /** Closes the view by calling OnClose(). If @a deleteWindow is @true, this function should delete the window associated with the view. */ virtual bool Close(bool deleteWindow = true); /** Gets a pointer to the document associated with the view. */ wxDocument* GetDocument() const; /** Returns a pointer to the document manager instance associated with this view. */ wxDocManager* GetDocumentManager() const; /** Gets the frame associated with the view (if any). Note that this "frame" is not a wxFrame at all in the generic MDI implementation which uses notebook pages instead of frames and this is why this method returns a wxWindow and not a wxFrame. */ wxWindow* GetFrame() const; /** Gets the name associated with the view (passed to the wxDocTemplate constructor). Not currently used by the framework. */ wxString GetViewName() const; /** Called when a view is activated by means of Activate(). The default implementation does nothing. */ virtual void OnActivateView(bool activate, wxView* activeView, wxView* deactiveView); /** Called when the filename has changed. The default implementation constructs a suitable title and sets the title of the view frame (if any). */ virtual void OnChangeFilename(); /** Implements closing behaviour. The default implementation calls wxDocument::Close() to close the associated document. Does not delete the view. The application may wish to do some cleaning up operations in this function, @e if a call to wxDocument::Close() succeeded. For example, if your views all share the same window, you need to disassociate the window from the view and perhaps clear the window. If @a deleteWindow is @true, delete the frame associated with the view. */ virtual bool OnClose(bool deleteWindow); /** Override this to clean up the view when the document is being closed. */ virtual void OnClosingDocument(); /** wxDocManager or wxDocument creates a wxView via a wxDocTemplate. Just after the wxDocTemplate creates the wxView, it calls OnCreate(). The wxView can create a wxDocChildFrame (or derived class) in its wxView::OnCreate() member function. This wxDocChildFrame provides user interface elements to view and/or edit the contents of the wxDocument. By default, simply returns @true. If the function returns @false, the view will be deleted. */ virtual bool OnCreate(wxDocument* doc, long flags); /** If the printing framework is enabled in the library, this function returns a wxPrintout object for the purposes of printing. It should create a new object every time it is called; the framework will delete objects it creates. By default, this function returns an instance of wxDocPrintout, which prints and previews one page by calling OnDraw(). Override to return an instance of a class other than wxDocPrintout. */ virtual wxPrintout* OnCreatePrintout(); /** Override this function to render the view on the given device context. */ virtual void OnDraw(wxDC* dc) = 0; /** Called when the view should be updated. @param sender A pointer to the wxView that sent the update request, or @NULL if no single view requested the update (for instance, when the document is opened). @param hint This is unused currently, but may in future contain application-specific information for making updating more efficient. */ virtual void OnUpdate(wxView* sender, wxObject* hint = 0); /** Associates the given document with the view. Normally called by the framework. */ virtual void SetDocument(wxDocument* doc); /** Sets the frame associated with this view. The application should call this if possible, to tell the view about the frame. See GetFrame() for the explanation about the mismatch between the "Frame" in the method name and the type of its parameter. */ void SetFrame(wxWindow* frame); /** Sets the view type name. Should only be called by the framework. */ void SetViewName(const wxString& name); /** The document associated with this view. There may be more than one view per document, but there can never be more than one document for one view. */ wxDocument* m_viewDocument; /** Frame associated with the view, if any. */ wxFrame* m_viewFrame; /** The view type name given to the wxDocTemplate constructor, copied to this variable when the view is created. Not currently used by the framework. */ wxString m_viewTypeName; }; /** @class wxDocChildFrame The wxDocChildFrame class provides a default frame for displaying documents on separate windows. This class can only be used for SDI (not MDI) child frames. The class is part of the document/view framework supported by wxWidgets, and cooperates with the wxView, wxDocument, wxDocManager and wxDocTemplate classes. @library{wxcore} @category{docview} @see @ref overview_docview, @ref page_samples_docview, wxFrame */ class wxDocChildFrame : public wxFrame { public: /** Constructor. */ wxDocChildFrame(wxDocument* doc, wxView* view, wxFrame* parent, wxWindowID id, const wxString& title, const wxPoint& pos = wxDefaultPosition, const wxSize& size = wxDefaultSize, long style = wxDEFAULT_FRAME_STYLE, const wxString& name = wxFrameNameStr); /** Destructor. */ virtual ~wxDocChildFrame(); /** Returns the document associated with this frame. */ wxDocument* GetDocument() const; /** Returns the view associated with this frame. */ wxView* GetView() const; /** Sets the currently active view to be the frame's view. You may need to override (but still call) this function in order to set the keyboard focus for your subwindow. */ void OnActivate(wxActivateEvent& event); /** Closes and deletes the current view and document. */ void OnCloseWindow(wxCloseEvent& event); /** Sets the document for this frame. */ void SetDocument(wxDocument* doc); /** Sets the view for this frame. */ void SetView(wxView* view); /** The document associated with the frame. */ wxDocument* m_childDocument; /** The view associated with the frame. */ wxView* m_childView; }; /** @class wxDocParentFrame The wxDocParentFrame class provides a default top-level frame for applications using the document/view framework. This class can only be used for SDI (not MDI) parent frames. It cooperates with the wxView, wxDocument, wxDocManager and wxDocTemplate classes. @library{wxcore} @category{docview} @see @ref overview_docview, @ref page_samples_docview, wxFrame */ class wxDocParentFrame : public wxFrame { public: /** Default constructor. */ wxDocParentFrame(); /** Constructor. */ wxDocParentFrame(wxDocManager* manager, wxFrame* parent, wxWindowID id, const wxString& title, const wxPoint& pos = wxDefaultPosition, const wxSize& size = wxDefaultSize, long style = wxDEFAULT_FRAME_STYLE, const wxString& name = wxFrameNameStr); /** Destructor. */ virtual ~wxDocParentFrame(); /** Used in two-step construction. */ bool Create(wxDocManager* manager, wxFrame* parent, wxWindowID id, const wxString& title, const wxPoint& pos = wxDefaultPosition, const wxSize& size = wxDefaultSize, long style = 541072960, const wxString& name = wxFrameNameStr); /** Returns the associated document manager object. */ wxDocManager* GetDocumentManager() const; /** Deletes all views and documents. If no user input cancelled the operation, the frame will be destroyed and the application will exit. Since understanding how document/view clean-up takes place can be difficult, the implementation of this function is shown below: @code void wxDocParentFrame::OnCloseWindow(wxCloseEvent& event) { if (m_docManager->Clear(!event.CanVeto())) { this->Destroy(); } else event.Veto(); } @endcode */ void OnCloseWindow(wxCloseEvent& event); }; /** @class wxDocument The document class can be used to model an application's file-based data. It is part of the document/view framework supported by wxWidgets, and cooperates with the wxView, wxDocTemplate and wxDocManager classes. @library{wxcore} @category{docview} @see @ref overview_docview, wxView, wxDocTemplate, wxDocManager */ class wxDocument : public wxEvtHandler { public: /** Constructor. Define your own default constructor to initialize application-specific data. */ wxDocument(wxDocument* parent = 0); /** Destructor. Removes itself from the document manager. */ virtual ~wxDocument(); /** If the view is not already in the list of views, adds the view and calls OnChangedViewList(). */ virtual bool AddView(wxView* view); /** Returns true if the document hasn't been modified since the last time it had been saved. Notice that this function returns @false if the document had been never saved at all, so it may be also used to test whether it makes sense to save the document: if it returns @true, there is nothing to save but if @false is returned, it can be saved, even if it might be not modified (this can be used to create an empty document file by the user). @see IsModified(), GetDocumentSaved() @since 2.9.0 */ bool AlreadySaved() const; /** Closes the document, by calling OnSaveModified() and then (if this returned @true) OnCloseDocument(). This does not normally delete the document object, use DeleteAllViews() to do this implicitly. */ virtual bool Close(); /** Calls wxView::Close() and deletes each view. Deleting the final view will implicitly delete the document itself, because the wxView destructor calls RemoveView(). This in turns calls OnChangedViewList(), whose default implemention is to save and delete the document if no views exist. */ virtual bool DeleteAllViews(); /** Virtual method called from OnCloseDocument(). This method may be overridden to perform any additional cleanup which might be needed when the document is closed. The return value of this method is currently ignored. The default version does nothing and simply returns @true. */ virtual bool DeleteContents(); /** Returns a pointer to the command processor associated with this document. @see wxCommandProcessor */ virtual wxCommandProcessor* GetCommandProcessor() const; /** Gets a pointer to the associated document manager. */ virtual wxDocManager* GetDocumentManager() const; /** Gets the document type name for this document. See the comment for @ref m_documentTypeName. */ wxString GetDocumentName() const; /** Return true if this document had been already saved. @see IsModified() */ bool GetDocumentSaved() const; /** Gets a pointer to the template that created the document. */ virtual wxDocTemplate* GetDocumentTemplate() const; /** Intended to return a suitable window for using as a parent for document-related dialog boxes. By default, uses the frame associated with the first view. */ virtual wxWindow* GetDocumentWindow() const; /** Gets the filename associated with this document, or "" if none is associated. */ wxString GetFilename() const; /** A convenience function to get the first view for a document, because in many cases a document will only have a single view. @see GetViews() */ wxView* GetFirstView() const; /** Gets the title for this document. The document title is used for an associated frame (if any), and is usually constructed by the framework from the filename. */ wxString GetTitle() const; /** Return the document name suitable to be shown to the user. The default implementation uses the document title, if any, of the name part of the document filename if it was set or, otherwise, the string @b unnamed. */ virtual wxString GetUserReadableName() const; //@{ /** Returns the list whose elements are the views on the document. @see GetFirstView() */ wxList& GetViews(); const wxList& GetViews() const; //@} /** Returns @true if the document has been modified since the last save, @false otherwise. You may need to override this if your document view maintains its own record of being modified. @see Modify() */ virtual bool IsModified() const; //@{ /** Override this function and call it from your own LoadObject() before streaming your own data. LoadObject() is called by the framework automatically when the document contents need to be loaded. @note This version of LoadObject() may not exist depending on how wxWidgets was configured. */ virtual istream& LoadObject(istream& stream); virtual wxInputStream& LoadObject(wxInputStream& stream); //@} /** Call with @true to mark the document as modified since the last save, @false otherwise. You may need to override this if your document view maintains its own record of being modified. @see IsModified() */ virtual void Modify(bool modify); /** Called when a view is added to or deleted from this document. The default implementation saves and deletes the document if no views exist (the last one has just been removed). */ virtual void OnChangedViewList(); /** This virtual function is called when the document is being closed. The default implementation calls DeleteContents() (which may be overridden to perform additional cleanup) and sets the modified flag to @false. You can override it to supply additional behaviour when the document is closed with Close(). Notice that previous wxWidgets versions used to call this function also from OnNewDocument(), rather counter-intuitively. This is no longer the case since wxWidgets 2.9.0. */ virtual bool OnCloseDocument(); /** Called just after the document object is created to give it a chance to initialize itself. The default implementation uses the template associated with the document to create an initial view. For compatibility reasons, this method may either delete the document itself if its initialization fails or not do it in which case it is deleted by caller. It is recommended to delete the document explicitly in this function if it can't be initialized. @param path The associated file path. @param flags Flags passed to CreateDocument(). @return @true if the initialization was successful or @false if it failed. */ virtual bool OnCreate(const wxString& path, long flags); /** Override this function if you want a different (or no) command processor to be created when the document is created. By default, it returns an instance of wxCommandProcessor. @see wxCommandProcessor */ virtual wxCommandProcessor* OnCreateCommandProcessor(); /** The default implementation calls OnSaveModified() and DeleteContents(), makes a default title for the document, and notifies the views that the filename (in fact, the title) has changed. */ virtual bool OnNewDocument(); /** Constructs an input file stream for the given filename (which must not be empty), and calls LoadObject(). If LoadObject() returns @true, the document is set to unmodified; otherwise, an error message box is displayed. The document's views are notified that the filename has changed, to give windows an opportunity to update their titles. All of the document's views are then updated. */ virtual bool OnOpenDocument(const wxString& filename); /** Constructs an output file stream for the given filename (which must not be empty), and calls SaveObject(). If SaveObject() returns @true, the document is set to unmodified; otherwise, an error message box is displayed. */ virtual bool OnSaveDocument(const wxString& filename); /** If the document has been modified, prompts the user to ask if the changes should be saved. If the user replies Yes, the Save() function is called. If No, the document is marked as unmodified and the function succeeds. If Cancel, the function fails. */ virtual bool OnSaveModified(); /** Removes the view from the document's list of views, and calls OnChangedViewList(). */ virtual bool RemoveView(wxView* view); /** Saves the document by calling OnSaveDocument() if there is an associated filename, or SaveAs() if there is no filename. */ virtual bool Save(); /** Prompts the user for a file to save to, and then calls OnSaveDocument(). */ virtual bool SaveAs(); /** Discard changes and load last saved version. Prompts the user first, and then calls DoOpenDocument() to reload the current file. */ virtual bool Revert(); //@{ /** Override this function and call it from your own SaveObject() before streaming your own data. SaveObject() is called by the framework automatically when the document contents need to be saved. @note This version of SaveObject() may not exist depending on how wxWidgets was configured. */ virtual ostream& SaveObject(ostream& stream); virtual wxOutputStream& SaveObject(wxOutputStream& stream); //@} /** Sets the command processor to be used for this document. The document will then be responsible for its deletion. Normally you should not call this; override OnCreateCommandProcessor() instead. @see wxCommandProcessor */ virtual void SetCommandProcessor(wxCommandProcessor* processor); /** Sets the document type name for this document. See the comment for @ref m_documentTypeName. */ void SetDocumentName(const wxString& name); /** Sets the pointer to the template that created the document. Should only be called by the framework. */ virtual void SetDocumentTemplate(wxDocTemplate* templ); /** Sets if this document has been already saved or not. Normally there is no need to call this function as the document-view framework does it itself as the documents are loaded from and saved to the files. However it may be useful in some particular cases, for example it may be called with @false argument to prevent the user from saving the just opened document into the same file if this shouldn't be done for some reason (e.g. file format version changes and a new extension should be used for saving). @see GetDocumentSaved(), AlreadySaved() */ void SetDocumentSaved(bool saved = true); /** Sets the filename for this document. Usually called by the framework. Calls OnChangeFilename() which in turn calls wxView::OnChangeFilename() for all views if @a notifyViews is @true. */ void SetFilename(const wxString& filename, bool notifyViews = false); /** If @a notifyViews is @true, wxView::OnChangeFilename() is called for all views. @since 2.9.0 */ virtual void OnChangeFilename(bool notifyViews); /** Sets the title for this document. The document title is used for an associated frame (if any), and is usually constructed by the framework from the filename. */ void SetTitle(const wxString& title); /** Updates all views. If @a sender is non-@NULL, does not update this view. @a hint represents optional information to allow a view to optimize its update. */ virtual void UpdateAllViews(wxView* sender = NULL, wxObject* hint = NULL); protected: /** This method is called by OnSaveDocument() to really save the document contents to the specified file. Base class version creates a file-based stream and calls SaveObject(). Override this if you need to do something else or prefer not to use SaveObject() at all. */ virtual bool DoSaveDocument(const wxString& file); /** This method is called by OnOpenDocument() to really load the document contents from the specified file. Base class version creates a file-based stream and calls LoadObject(). Override this if you need to do something else or prefer not to use LoadObject() at all. */ virtual bool DoOpenDocument(const wxString& file); /** A pointer to the command processor associated with this document. */ wxCommandProcessor* m_commandProcessor; /** Filename associated with this document ("" if none). */ wxString m_documentFile; /** @true if the document has been modified, @false otherwise. */ bool m_documentModified; /** A pointer to the template from which this document was created. */ wxDocTemplate* m_documentTemplate; /** Document title. The document title is used for an associated frame (if any), and is usually constructed by the framework from the filename. */ wxString m_documentTitle; /** The document type name given to the wxDocTemplate constructor, copied to this variable when the document is created. If several document templates are created that use the same document type, this variable is used in wxDocManager::CreateView() to collate a list of alternative view types that can be used on this kind of document. Do not change the value of this variable. */ wxString m_documentTypeName; /** List of wxView instances associated with this document. */ wxList m_documentViews; }; // ============================================================================ // Global functions/macros // ============================================================================ /** @addtogroup group_funcmacro_file */ //@{ /** Copies the given file to @a stream. Useful when converting an old application to use streams (within the document/view framework, for example). @header{wx/docview.h} */ bool wxTransferFileToStream(const wxString& filename, ostream& stream); /** Copies the given stream to the file @a filename. Useful when converting an old application to use streams (within the document/view framework, for example). @header{wx/docview.h} */ bool wxTransferStreamToFile(istream& stream, const wxString& filename); //@}