wxWidgets/interface/wx/propgrid/propgrid.h

/////////////////////////////////////////////////////////////////////////////
// Name:        propgrid.h
// Purpose:     interface of wxPropertyGrid
// Author:      wxWidgets team
// RCS-ID:      $Id:
// Licence:     wxWindows license
/////////////////////////////////////////////////////////////////////////////


/** @section propgrid_window_styles wxPropertyGrid Window Styles

    SetWindowStyleFlag method can be used to modify some of these at run-time.
    @{
*/
enum wxPG_WINDOW_STYLES
{

/** This will cause Sort() automatically after an item is added.
    When inserting a lot of items in this mode, it may make sense to
    use Freeze() before operations and Thaw() afterwards to increase
    performance.
*/
wxPG_AUTO_SORT                      = 0x00000010,

/** Categories are not initially shown (even if added).
    IMPORTANT NOTE: If you do not plan to use categories, then this
    style will waste resources.
    This flag can also be changed using wxPropertyGrid::EnableCategories method.
*/
wxPG_HIDE_CATEGORIES                = 0x00000020,

/* This style combines non-categoric mode and automatic sorting.
*/
wxPG_ALPHABETIC_MODE                = (wxPG_HIDE_CATEGORIES|wxPG_AUTO_SORT),

/** Modified values are shown in bold font. Changing this requires Refresh()
    to show changes.
*/
wxPG_BOLD_MODIFIED                  = 0x00000040,

/** When wxPropertyGrid is resized, splitter moves to the center. This
    behavior stops once the user manually moves the splitter.
*/
wxPG_SPLITTER_AUTO_CENTER           = 0x00000080,

/** Display tooltips for cell text that cannot be shown completely. If
    wxUSE_TOOLTIPS is 0, then this doesn't have any effect.
*/
wxPG_TOOLTIPS                       = 0x00000100,

/** Disables margin and hides all expand/collapse buttons that would appear
    outside the margin (for sub-properties). Toggling this style automatically
    expands all collapsed items.
*/
wxPG_HIDE_MARGIN                    = 0x00000200,

/** This style prevents user from moving the splitter.
*/
wxPG_STATIC_SPLITTER                = 0x00000400,

/** Combination of other styles that make it impossible for user to modify
    the layout.
*/
wxPG_STATIC_LAYOUT                  = (wxPG_HIDE_MARGIN|wxPG_STATIC_SPLITTER),

/** Disables wxTextCtrl based editors for properties which
    can be edited in another way. Equals calling wxPropertyGrid::LimitPropertyEditing
    for all added properties.
*/
wxPG_LIMITED_EDITING                = 0x00000800,

/** wxPropertyGridManager only: Show toolbar for mode and page selection. */
wxPG_TOOLBAR                        = 0x00001000,

/** wxPropertyGridManager only: Show adjustable text box showing description
    or help text, if available, for currently selected property.
*/
wxPG_DESCRIPTION                    = 0x00002000

};

enum wxPG_EX_WINDOW_STYLES
{

/**
    NOTE: wxPG_EX_xxx are extra window styles and must be set using SetExtraStyle()
    member function.

    Speeds up switching to wxPG_HIDE_CATEGORIES mode. Initially, if wxPG_HIDE_CATEGORIES
    is not defined, the non-categorized data storage is not activated, and switching
    the mode first time becomes somewhat slower. wxPG_EX_INIT_NOCAT activates the
    non-categorized data storage right away. IMPORTANT NOTE: If you do plan not
    switching to non-categoric mode, or if you don't plan to use categories at
    all, then using this style will result in waste of resources.

*/
wxPG_EX_INIT_NOCAT                  = 0x00001000,

/** Extended window style that sets wxPropertyGridManager toolbar to not
    use flat style.
*/
wxPG_EX_NO_FLAT_TOOLBAR             = 0x00002000,

/** Shows alphabetic/categoric mode buttons from toolbar.
*/
wxPG_EX_MODE_BUTTONS                = 0x00008000,

/** Show property help strings as tool tips instead as text on the status bar.
    You can set the help strings using SetPropertyHelpString member function.
*/
wxPG_EX_HELP_AS_TOOLTIPS            = 0x00010000,

/** Prevent TAB from focusing to wxButtons. This behavior was default
    in version 1.2.0 and earlier.
    NOTE! Tabbing to button doesn't work yet. Problem seems to be that on wxMSW
      atleast the button doesn't properly propagate key events (yes, I'm using
      wxWANTS_CHARS).
*/
//wxPG_EX_NO_TAB_TO_BUTTON            = 0x00020000,

/** Allows relying on native double-buffering.
*/
wxPG_EX_NATIVE_DOUBLE_BUFFERING         = 0x00080000,

/** Set this style to let user have ability to set values of properties to
    unspecified state. Same as setting wxPG_PROP_AUTO_UNSPECIFIED for
    all properties.
*/
wxPG_EX_AUTO_UNSPECIFIED_VALUES         = 0x00200000,

/** If this style is used, built-in attributes (such as wxPG_FLOAT_PRECISION and wxPG_STRING_PASSWORD)
    are not stored into property's attribute storage (thus they are not readable).

    Note that this option is global, and applies to all wxPG property containers.
*/
wxPG_EX_WRITEONLY_BUILTIN_ATTRIBUTES    = 0x00400000,

/** With this style Validators on properties will work same as in wxPropertyGrid 1.2.
*/
wxPG_EX_LEGACY_VALIDATORS               = 0x00800000,

/** Hides page selection buttons from toolbar.
*/
wxPG_EX_HIDE_PAGE_BUTTONS               = 0x01000000

};

/** Combines various styles.
*/
#define wxPG_DEFAULT_STYLE	        (0)

/** Combines various styles.
*/
#define wxPGMAN_DEFAULT_STYLE	    (0)

/** @}
*/

// -----------------------------------------------------------------------

/** wxPropertyGrid Validation Failure Behavior Flags
    @{
*/

enum wxPG_VALIDATION_FAILURE_BEHAVIOR_FLAGS
{

/** Prevents user from leaving property unless value is valid. If this
    behavior flag is not used, then value change is instead cancelled.
*/
wxPG_VFB_STAY_IN_PROPERTY           = 0x01,

/** Calls wxBell() on validation failure.
*/
wxPG_VFB_BEEP                       = 0x02,

/** Cell with invalid value will be marked (with red colour).
*/
wxPG_VFB_MARK_CELL                  = 0x04,

/** Display customizable text message explaining the situation.
*/
wxPG_VFB_SHOW_MESSAGE               = 0x08,

/** Defaults. */
wxPG_VFB_DEFAULT                    = wxPG_VFB_STAY_IN_PROPERTY|wxPG_VFB_BEEP,

/** Only used internally. */
wxPG_VFB_UNDEFINED                  = 0x80

};

/** @}
*/

typedef wxByte wxPGVFBFlags;

/** wxPGValidationInfo

    Used to convey validation information to and from functions that
    actually perform validation.
*/
struct wxPGValidationInfo
{
    /** Value to be validated.
    */
    wxVariant*      m_pValue;

    /** Message displayed on validation failure.
    */
    wxString        m_failureMessage;

    /** Validation failure behavior. Use wxPG_VFB_XXX flags.
    */
    wxPGVFBFlags    m_failureBehavior;

    wxPGVFBFlags GetFailureBehavior() const { return m_failureBehavior; }

    void SetFailureBehavior(wxPGVFBFlags failureBehavior) { m_failureBehavior = failureBehavior; }

    const wxString& GetFailureMessage() const { return m_failureMessage; }

    void SetFailureMessage(const wxString& message) { m_failureMessage = message; }
};

// -----------------------------------------------------------------------

/** wxPropertyGrid Action Identifiers
    These are used with wxPropertyGrid::AddActionTrigger() and wxPropertyGrid::ClearActionTriggers().
    @{
*/

enum wxPG_KEYBOARD_ACTIONS
{
    wxPG_ACTION_INVALID = 0,
    wxPG_ACTION_NEXT_PROPERTY,
    wxPG_ACTION_PREV_PROPERTY,
    wxPG_ACTION_EXPAND_PROPERTY,
    wxPG_ACTION_COLLAPSE_PROPERTY,
    wxPG_ACTION_CANCEL_EDIT,
    wxPG_ACTION_CUT,
    wxPG_ACTION_COPY,
    wxPG_ACTION_PASTE,
    wxPG_ACTION_MAX
};

/** @}
*/

// -----------------------------------------------------------------------

/** @class wxPropertyGrid

      wxPropertyGrid is a specialized grid for editing properties - in other
    words name = value pairs. List of ready-to-use property classes include
    strings, numbers, flagsets, fonts, colours and many others. It is possible,
    for example, to categorize properties, set up a complete tree-hierarchy,
    add more than two columns, and set arbitrary per-property attributes.

    Please note that most member functions are inherited and as such not documented on
    this page. This means you will probably also want to read wxPropertyGridInterface
    class reference.

    See also @ref overview_propgrid.

    @section propgrid_window_styles_ Window Styles

    See @ref propgrid_window_styles.

    @section propgrid_event_handling Event Handling

    To process input from a propertygrid control, use these event handler macros to
    direct input to member functions that take a wxPropertyGridEvent argument.

    @beginEventTable{wxPropertyGridEvent}
    @event{EVT_PG_SELECTED (id, func)}
        Respond to wxEVT_PG_SELECTED event, generated when property value
        has been changed by user.
    @event{EVT_PG_CHANGING(id, func)}
        Respond to wxEVT_PG_CHANGING event, generated when property value
        is about to be changed by user. Use wxPropertyGridEvent::GetValue()
        to take a peek at the pending value, and wxPropertyGridEvent::Veto()
        to prevent change from taking place, if necessary.
    @event{EVT_PG_HIGHLIGHTED(id, func)}
        Respond to wxEVT_PG_HIGHLIGHTED event, which occurs when mouse
        moves over a property. Event's property is NULL if hovered area does
        not belong to any property.
    @event{EVT_PG_RIGHT_CLICK(id, func)}
        Respond to wxEVT_PG_RIGHT_CLICK event, which occurs when property is
        clicked on with right mouse button.
    @event{EVT_PG_DOUBLE_CLICK(id, func)}
        Respond to wxEVT_PG_DOUBLE_CLICK event, which occurs when property is
        double-clicked onwith left mouse button.
    @event{EVT_PG_ITEM_COLLAPSED(id, func)}
        Respond to wxEVT_PG_ITEM_COLLAPSED event, generated when user collapses
        a property or category..
    @event{EVT_PG_ITEM_EXPANDED(id, func)}
        Respond to wxEVT_PG_ITEM_EXPANDED event, generated when user expands
        a property or category..
    @endEventTable

    @remarks

    - Use Freeze() and Thaw() respectively to disable and enable drawing. This
      will also delay sorting etc. miscellaneous calculations to the last possible
      moment.

    @library{wxpropgrid}
    @category{propgrid}
*/
class wxPropertyGrid : public wxScrolledWindow, public wxPropertyGridInterface
{
public:

	/** Two step constructor. Call Create when this constructor is called to build up the
	    wxPropertyGrid
	*/
    wxPropertyGrid();

    /** The default constructor. The styles to be used are styles valid for
        the wxWindow and wxScrolledWindow.
        @sa @link wndflags Additional Window Styles@endlink
    */
    wxPropertyGrid( wxWindow *parent, wxWindowID id = wxID_ANY,
               	    const wxPoint& pos = wxDefaultPosition,
               	    const wxSize& size = wxDefaultSize,
               	    long style = wxPG_DEFAULT_STYLE,
               	    const wxChar* name = wxPropertyGridNameStr );

    /** Destructor */
    virtual ~wxPropertyGrid();

    /** Adds given key combination to trigger given action.
        @param action
        Which action to trigger. See @link pgactions List of list of wxPropertyGrid actions@endlink.
    */
    void AddActionTrigger( int action, int keycode, int modifiers = 0 );

    /** This static function enables or disables automatic use of wxGetTranslation for
        following strings: wxEnumProperty list labels, wxFlagsProperty sub-property
        labels.
        Default is false.
    */
    static void AutoGetTranslation( bool enable );

    /** Changes value of a property, as if from an editor. Use this instead of SetPropertyValue()
        if you need the value to run through validation process, and also send the property
        change event.

        @return
        Returns true if value was successfully changed.
    */
    bool ChangePropertyValue( wxPGPropArg id, wxVariant newValue );

    /** Centers the splitter. If argument is true, automatic splitter centering is
        enabled (only applicapple if style wxPG_SPLITTER_AUTO_CENTER was defined).
    */
    void CenterSplitter( bool enable_auto_centering = false );

    /** Deletes all properties.
    */
    virtual void Clear();

    /** Clears action triggers for given action.
        @param action
        Which action to trigger. See @link pgactions List of list of wxPropertyGrid actions@endlink.
    */
    void ClearActionTriggers( int action );

    /** Forces updating the value of property from the editor control.
        Note that wxEVT_PG_CHANGING and wxEVT_PG_CHANGED are dispatched using ProcessEvent,
        meaning your event handlers will be called immediately.

        @retval
        Returns true if anything was changed.
    */
    virtual bool CommitChangesFromEditor( wxUint32 flags = 0 );

    /** Two step creation. Whenever the control is created without any parameters, use Create to actually
        create it. Don't access the control's public methods before this is called
        @sa @link wndflags Additional Window Styles@endlink
    */
    bool Create( wxWindow *parent, wxWindowID id = wxID_ANY,
                 const wxPoint& pos = wxDefaultPosition,
                 const wxSize& size = wxDefaultSize,
                 long style = wxPG_DEFAULT_STYLE,
                 const wxChar* name = wxPropertyGridNameStr );

    /** Call when editor widget's contents is modified. For example, this is called
        when changes text in wxTextCtrl (used in wxStringProperty and wxIntProperty).

        @remarks
        This function should only be called by custom properties.

        @see wxPGProperty::OnEvent()
    */
    void EditorsValueWasModified() { m_iFlags |= wxPG_FL_VALUE_MODIFIED; }

    /** Reverse of EditorsValueWasModified().

        @remarks
        This function should only be called by custom properties.
    */
    void EditorsValueWasNotModified()
    {
        m_iFlags &= ~(wxPG_FL_VALUE_MODIFIED);
    }

    /** Enables or disables (shows/hides) categories according to parameter enable. */
    bool EnableCategories( bool enable );

    /** Scrolls and/or expands items to ensure that the given item is visible.
        Returns true if something was actually done.
    */
    bool EnsureVisible( wxPGPropArg id );

    /** Reduces column sizes to minimum possible that contents are still visibly (naturally
        some margin space will be applied as well).

        @return
        Minimum size for the grid to still display everything.

        @remarks
        Does not work well with wxPG_SPLITTER_AUTO_CENTER window style.

        This function only works properly if grid size prior to call was already
        fairly large.

        Note that you can also get calculated column widths by calling GetState->GetColumnWidth()
        immediately after this function returns.
    */
    wxSize FitColumns()
    {
        wxSize sz = m_pState->DoFitColumns();
        return sz;
    }

    /** Returns wxWindow that the properties are painted on, and which should be used
        as the parent for editor controls.
    */
    wxPanel* GetPanel() const
    {
        return m_canvas;
    }

    /** Returns current category caption background colour. */
    wxColour GetCaptionBackgroundColour() const { return m_colCapBack; }

    wxFont& GetCaptionFont() { return m_captionFont; }

    const wxFont& GetCaptionFont() const { return m_captionFont; }

    /** Returns current category caption text colour. */
    wxColour GetCaptionForegroundColour() const { return m_colCapFore; }

    /** Returns current cell background colour. */
    wxColour GetCellBackgroundColour() const { return m_colPropBack; }

    /** Returns current cell text colour when disabled. */
    wxColour GetCellDisabledTextColour() const { return m_colDisPropFore; }

    /** Returns current cell text colour. */
    wxColour GetCellTextColour() const { return m_colPropFore; }

    /** Returns number of columns on current page. */
    int GetColumnCount() const
    {
        return m_pState->m_colWidths.size();
    }

    /** Returns colour of empty space below properties. */
    wxColour GetEmptySpaceColour() const { return m_colEmptySpace; }

    /** Returns height of highest characters of used font. */
    int GetFontHeight() const { return m_fontHeight; }

    /** Returns pointer to itself. Dummy function that enables same kind
        of code to use wxPropertyGrid and wxPropertyGridManager.
    */
    wxPropertyGrid* GetGrid() { return this; }

    /** Returns rectangle of custom paint image.
    */
    wxRect GetImageRect( wxPGProperty* p, int item ) const;

    /** Returns size of the custom paint image in front of property.
        If no argument is given, returns preferred size.
    */
    wxSize GetImageSize( wxPGProperty* p = NULL, int item = -1 ) const;

    //@{
    /** Returns last item which could be iterated using given flags.
        @param flags
        See @ref propgrid_iterator_flags.
    */
    wxPGProperty* GetLastItem( int flags = wxPG_ITERATE_DEFAULT )
    {
        return m_pState->GetLastItem(flags);
    }

    const wxPGProperty* GetLastItem( int flags = wxPG_ITERATE_DEFAULT ) const
    {
        return m_pState->GetLastItem(flags);
    }
    //@}

    /** Returns colour of lines between cells. */
    wxColour GetLineColour() const { return m_colLine; }

    /** Returns background colour of margin. */
    wxColour GetMarginColour() const { return m_colMargin; }

    /** Returns cell background colour of a property. */
    wxColour GetPropertyBackgroundColour( wxPGPropArg id ) const;

    /** Returns cell background colour of a property. */
    wxColour GetPropertyTextColour( wxPGPropArg id ) const;

    /** Returns "root property". It does not have name, etc. and it is not
        visible. It is only useful for accessing its children.
    */
    wxPGProperty* GetRoot() const { return m_pState->m_properties; }

    /** Returns height of a single grid row (in pixels). */
    int GetRowHeight() const { return m_lineHeight; }

    /** Returns currently selected property. */
    wxPGProperty* GetSelectedProperty () const { return GetSelection(); }

    /** Returns currently selected property. */
    wxPGProperty* GetSelection() const
    {
        return m_selected;
    }

    /** Returns current selection background colour. */
    wxColour GetSelectionBackgroundColour() const { return m_colSelBack; }

    /** Returns current selection text colour. */
    wxColour GetSelectionForegroundColour() const { return m_colSelFore; }

    /** Returns current splitter x position. */
    int GetSplitterPosition() const { return m_pState->DoGetSplitterPosition(0); }

    /** Returns wxTextCtrl active in currently selected property, if any. Takes
        into account wxOwnerDrawnComboBox.
    */
    wxTextCtrl* GetEditorTextCtrl() const;

    wxPGValidationInfo& GetValidationInfo()
    {
        return m_validationInfo;
    }

    /** Returns current vertical spacing. */
    int GetVerticalSpacing() const { return (int)m_vspacing; }

    /** Returns true if editor's value was marked modified.
    */
    bool IsEditorsValueModified() const { return  ( m_iFlags & wxPG_FL_VALUE_MODIFIED ) ? true : false; }

    /** Returns information about arbitrary position in the grid.
    */
    wxPropertyGridHitTestResult HitTest( const wxPoint& pt ) const;

    /** Returns true if any property has been modified by the user. */
    bool IsAnyModified() const { return (m_pState->m_anyModified>0); }

    /** Returns true if updating is frozen (ie. Freeze() called but not yet Thaw() ). */
    bool IsFrozen() const { return (m_frozen>0)?true:false; }

    /** Redraws given property.
    */
    virtual void RefreshProperty( wxPGProperty* p );

    /** Registers a new editor class.
        @retval
        Pointer to the editor class instance that should be used.
    */
    static wxPGEditor* RegisterEditorClass( wxPGEditor* editor, const wxString& name,
                                            bool noDefCheck = false );

    /** Resets all colours to the original system values.
    */
    void ResetColours();

    /** Selects a property. Editor widget is automatically created, but
        not focused unless focus is true. This will generate wxEVT_PG_SELECT event.
        @param id
        Property to select.
        @retval
        True if selection finished successfully. Usually only fails if current
        value in editor is not valid.
        @sa wxPropertyGrid::Unselect
    */
    bool SelectProperty( wxPGPropArg id, bool focus = false )
    {
        wxPG_PROP_ARG_CALL_PROLOG_RETVAL(false)
        return DoSelectProperty(p,focus?wxPG_SEL_FOCUS:0);
    }

    /** Changes keyboard shortcut to push the editor button.
        @remarks
        You can set default with keycode 0. Good value for the platform is guessed,
        but don't expect it to be very accurate.
    */
    void SetButtonShortcut( int keycode, bool ctrlDown = false, bool altDown = false );

    /** Sets category caption background colour. */
    void SetCaptionBackgroundColour(const wxColour& col);

    /** Sets category caption text colour. */
    void SetCaptionTextColour(const wxColour& col);

    /** Sets default cell background colour - applies to property cells.
        Note that appearance of editor widgets may not be affected.
    */
    void SetCellBackgroundColour(const wxColour& col);

    /** Sets cell text colour for disabled properties.
    */
    void SetCellDisabledTextColour(const wxColour& col);

    /** Sets default cell text colour - applies to property name and value text.
        Note that appearance of editor widgets may not be affected.
    */
    void SetCellTextColour(const wxColour& col);

    /** Set number of columns (2 or more).
    */
    void SetColumnCount( int colCount )
    {
        m_pState->SetColumnCount(colCount);
        Refresh();
    }

    /** Sets the 'current' category - Append will add non-category properties under it.
    */
    void SetCurrentCategory( wxPGPropArg id );

    /** Sets colour of empty space below properties. */
    void SetEmptySpaceColour(const wxColour& col);

    /** Sets colour of lines between cells. */
    void SetLineColour(const wxColour& col);

    /** Sets background colour of margin. */
    void SetMarginColour(const wxColour& col);

    /** Sets background colour of property and all its children. Colours of
        captions are not affected. Background brush cache is optimized for often
        set colours to be set last.
    */
    void SetPropertyBackgroundColour( wxPGPropArg id, const wxColour& col );

    /** Resets text and background colours of given property.
    */
    void SetPropertyColoursToDefault( wxPGPropArg id );

    /** Sets text colour of property and all its children.
    */
    void SetPropertyTextColour( wxPGPropArg id, const wxColour& col, bool recursively = true );

    /** Sets selection background colour - applies to selected property name background. */
    void SetSelectionBackgroundColour(const wxColour& col);

    /** Sets selection foreground colour - applies to selected property name text. */
    void SetSelectionTextColour(const wxColour& col);

    /** Sets x coordinate of the splitter.
        @remarks
        Splitter position cannot exceed grid size, and therefore setting it during
        form creation may fail as initial grid size is often smaller than desired
        splitter position, especially when sizers are being used.
    */
    void SetSplitterPosition( int newxpos, int col = 0 )
    {
        DoSetSplitterPosition_(newxpos, true, col);
        m_iFlags |= wxPG_FL_SPLITTER_PRE_SET;
    }

    /** Set virtual width for this particular page. Width -1 indicates that the
        virtual width should be disabled. */
    void SetVirtualWidth( int width );

    /** Sets name of a property.
        @param id
        Name or pointer of property which name to change.
        @param newname
        New name.
    */
    void SetPropertyName( wxPGPropArg id, const wxString& newname )
    {
        wxPG_PROP_ARG_CALL_PROLOG()
        DoSetPropertyName( p, newname );
    }

    /** Moves splitter as left as possible, while still allowing all
        labels to be shown in full.
        @param subProps
        If false, will still allow sub-properties (ie. properties which
        parent is not root or category) to be cropped.
    */
    void SetSplitterLeft( bool subProps = false )
    {
        m_pState->SetSplitterLeft(subProps);
    }

    /** Sets vertical spacing. Can be 1, 2, or 3 - a value relative to font
        height. Value of 2 should be default on most platforms.
        @remarks
        On wxMSW, wxComboBox, when used as property editor widget, will spill
        out with anything less than 3.
    */
    void SetVerticalSpacing( int vspacing )
    {
        m_vspacing = (unsigned char)vspacing;
        CalculateFontAndBitmapStuff( vspacing );
        if ( !m_pState->m_itemsAdded ) Refresh();
    }

    /** Shows an brief error message that is related to a property. */
    void ShowPropertyError( wxPGPropArg id, const wxString& msg )
    {
        wxPG_PROP_ARG_CALL_PROLOG()
        DoShowPropertyError(p, msg);
    }

    /** Sorts all items at all levels (except sub-properties). */
    void Sort();

    /** Sorts children of a category.
    */
    void SortChildren( wxPGPropArg id );
};


/** @class wxPropertyGridEvent

    A propertygrid event holds information about events associated with
    wxPropertyGrid objects.

    @library{wxpropgrid}
    @category{propgrid}
*/
class wxPropertyGridEvent : public wxCommandEvent
{
public:

    /** Constructor. */
    wxPropertyGridEvent(wxEventType commandType=0, int id=0);

    /** Copy constructor. */
    wxPropertyGridEvent(const wxPropertyGridEvent& event);

    /** Destructor. */
    ~wxPropertyGridEvent();

    /** Copyer. */
    virtual wxEvent* Clone() const;

    wxPGProperty* GetMainParent() const
    {
        wxASSERT(m_property);
        return m_property->GetMainParent();
    }

    /** Returns id of associated property. */
    wxPGProperty* GetProperty() const
    {
        return m_property;
    }

    wxPGValidationInfo& GetValidationInfo()
    {
        wxASSERT(m_validationInfo);
        return *m_validationInfo;
    }

    /** Returns true if event has associated property. */
    bool HasProperty() const { return ( m_property != (wxPGProperty*) NULL ); }

    /** Returns true if you can veto the action that the event is signaling.
    */
    bool CanVeto() const { return m_canVeto; }

    /** Call this from your event handler to veto action that the event is signaling.
        You can only veto a shutdown if wxPropertyGridEvent::CanVeto returns true.
        @remarks
        Currently only wxEVT_PG_CHANGING supports vetoing.
    */
    void Veto( bool veto = true ) { m_wasVetoed = veto; }

    /** Returns value that is about to be set for wxEVT_PG_CHANGING.
    */
    const wxVariant& GetValue() const
    {
        wxASSERT_MSG( m_validationInfo,
                      wxT("Only call GetValue from a handler of event type that supports it") );
        return *m_validationInfo->m_pValue;
    }

    /** Set override validation failure behavior. Only effective if Veto was also called,
        and only allowed if event type is wxEVT_PG_CHANGING.
    */
    void SetValidationFailureBehavior( int flags )
    {
        wxASSERT( GetEventType() == wxEVT_PG_CHANGING );
        m_validationInfo->m_failureBehavior = (wxPGVFBFlags) flags;
    }

    /** Sets custom failure message for this time only. Only applies if
        wxPG_VFB_SHOW_MESSAGE is set in validation failure flags.
    */
    void SetValidationFailureMessage( const wxString& message )
    {
        wxASSERT( GetEventType() == wxEVT_PG_CHANGING );
        m_validationInfo->m_failureMessage = message;
    }

    wxPGVFBFlags GetValidationFailureBehavior() const
    {
        wxASSERT( GetEventType() == wxEVT_PG_CHANGING );
        return m_validationInfo->m_failureBehavior;
    }

    void SetCanVeto( bool canVeto ) { m_canVeto = canVeto; }
    bool WasVetoed() const { return m_wasVetoed; }

    /** Changes the associated property. */
    void SetProperty( wxPGProperty* p ) { m_property = p; }

    void SetPropertyGrid( wxPropertyGrid* pg ) { m_pg = pg; }
};