Detailed Description

A help event is sent when the user has requested context-sensitive help.

This can either be caused by the application requesting context-sensitive help mode via wxContextHelp, or (on MS Windows) by the system generating a WM_HELP message when the user pressed F1 or clicked on the query button in a dialog caption.

A help event is sent to the window that the user clicked on, and is propagated up the window hierarchy until the event is processed or there are no more event handlers.

The application should call wxEvent::GetId to check the identity of the clicked-on window, and then either show some suitable help or call wxEvent::Skip() if the identifier is unrecognised.

Calling Skip is important because it allows wxWidgets to generate further events for ancestors of the clicked-on window. Otherwise it would be impossible to show help for container windows, since processing would stop after the first window found.

Events using this class

The following event handler macros redirect the events to member function handlers 'func' with prototypes like:

void handlerFuncName(wxHelpEvent& event)

Event macros:

EVT_HELP(id, func):
Process a wxEVT_HELP event.
EVT_HELP_RANGE(id1, id2, func):
Process a wxEVT_HELP event for a range of ids.

Library: wxCore

Category: Events

See also: wxContextHelp, wxDialog, Events and Event Handling

Public Types
enum	Origin { Origin_Unknown, Origin_Keyboard, Origin_HelpButton }
	Indicates how a wxHelpEvent was generated. More...

Public Member Functions
	wxHelpEvent (wxEventType type=wxEVT_NULL, wxWindowID winid=0, const wxPoint &pt=wxDefaultPosition, wxHelpEvent::Origin origin=Origin_Unknown)
	Constructor. More...

wxHelpEvent::Origin	GetOrigin () const
	Returns the origin of the help event which is one of the wxHelpEvent::Origin values. More...

const wxPoint &	GetPosition () const
	Returns the left-click position of the mouse, in screen coordinates. More...

void	SetOrigin (wxHelpEvent::Origin origin)
	Set the help event origin, only used internally by wxWidgets normally. More...

void	SetPosition (const wxPoint &pt)
	Sets the left-click position of the mouse, in screen coordinates. More...

Public Member Functions inherited from wxCommandEvent
	wxCommandEvent (wxEventType commandEventType=wxEVT_NULL, int id=0)
	Constructor. More...

void *	GetClientData () const
	Returns client data pointer for a listbox or choice selection event (not valid for a deselection). More...

wxClientData *	GetClientObject () const
	Returns client object pointer for a listbox or choice selection event (not valid for a deselection). More...

long	GetExtraLong () const
	Returns extra information dependent on the event objects type. More...

int	GetInt () const
	Returns the integer identifier corresponding to a listbox, choice or radiobox selection (only if the event was a selection, not a deselection), or a boolean value representing the value of a checkbox. More...

int	GetSelection () const
	Returns item index for a listbox or choice selection event (not valid for a deselection). More...

wxString	GetString () const
	Returns item string for a listbox or choice selection event. More...

bool	IsChecked () const
	This method can be used with checkbox and menu events: for the checkboxes, the method returns true for a selection event and false for a deselection one. More...

bool	IsSelection () const
	For a listbox or similar event, returns true if it is a selection, false if it is a deselection. More...

void	SetClientData (void *clientData)
	Sets the client data for this event. More...

void	SetClientObject (wxClientData *clientObject)
	Sets the client object for this event. More...

void	SetExtraLong (long extraLong)
	Sets the m_extraLong member. More...

void	SetInt (int intCommand)
	Sets the m_commandInt member. More...

void	SetString (const wxString &string)
	Sets the m_commandString member. More...

Public Member Functions inherited from wxEvent
	wxEvent (int id=0, wxEventType eventType=wxEVT_NULL)
	Constructor. More...

virtual wxEvent *	Clone () const =0
	Returns a copy of the event. More...

wxObject *	GetEventObject () const
	Returns the object (usually a window) associated with the event, if any. More...

wxEventType	GetEventType () const
	Returns the identifier of the given event type, such as `wxEVT_BUTTON`. More...

virtual wxEventCategory	GetEventCategory () const
	Returns a generic category for this event. More...

int	GetId () const
	Returns the identifier associated with this event, such as a button command id. More...

wxObject *	GetEventUserData () const
	Return the user data associated with a dynamically connected event handler. More...

bool	GetSkipped () const
	Returns true if the event handler should be skipped, false otherwise. More...

long	GetTimestamp () const
	Gets the timestamp for the event. More...

bool	IsCommandEvent () const
	Returns true if the event is or is derived from wxCommandEvent else it returns false. More...

void	ResumePropagation (int propagationLevel)
	Sets the propagation level to the given value (for example returned from an earlier call to wxEvent::StopPropagation). More...

void	SetEventObject (wxObject *object)
	Sets the originating object. More...

void	SetEventType (wxEventType type)
	Sets the event type. More...

void	SetId (int id)
	Sets the identifier associated with this event, such as a button command id. More...

void	SetTimestamp (long timeStamp=0)
	Sets the timestamp for the event. More...

bool	ShouldPropagate () const
	Test if this event should be propagated or not, i.e. if the propagation level is currently greater than 0. More...

void	Skip (bool skip=true)
	This method can be used inside an event handler to control whether further event handlers bound to this event will be called after the current one returns. More...

int	StopPropagation ()
	Stop the event from propagating to its parent window. More...

Public Member Functions inherited from wxObject
	wxObject ()
	Default ctor; initializes to NULL the internal reference data. More...

	wxObject (const wxObject &other)
	Copy ctor. More...

virtual	~wxObject ()
	Destructor. More...

virtual wxClassInfo *	GetClassInfo () const
	This virtual function is redefined for every class that requires run-time type information, when using the wxDECLARE_CLASS macro (or similar). More...

wxObjectRefData *	GetRefData () const
	Returns the wxObject::m_refData pointer, i.e. the data referenced by this object. More...

bool	IsKindOf (const wxClassInfo *info) const
	Determines whether this class is a subclass of (or the same class as) the given class. More...

bool	IsSameAs (const wxObject &obj) const
	Returns true if this object has the same data pointer as obj. More...

void	Ref (const wxObject &clone)
	Makes this object refer to the data in clone. More...

void	SetRefData (wxObjectRefData *data)
	Sets the wxObject::m_refData pointer. More...

void	UnRef ()
	Decrements the reference count in the associated data, and if it is zero, deletes the data. More...

void	UnShare ()
	This is the same of AllocExclusive() but this method is public. More...

void	operator delete (void *buf)
	The delete operator is defined for debugging versions of the library only, when the identifier `WXDEBUG` is defined. More...

void *	operator new (size_t size, const wxString &filename=NULL, int lineNum=0)
	The new operator is defined for debugging versions of the library only, when the identifier `WXDEBUG` is defined. More...

Additional Inherited Members
Protected Member Functions inherited from wxObject
void	AllocExclusive ()
	Ensure that this object's data is not shared with any other object. More...

virtual wxObjectRefData *	CreateRefData () const
	Creates a new instance of the wxObjectRefData-derived class specific to this object and returns it. More...

virtual wxObjectRefData *	CloneRefData (const wxObjectRefData *data) const
	Creates a new instance of the wxObjectRefData-derived class specific to this object and initializes it copying data. More...

Protected Attributes inherited from wxEvent
int	m_propagationLevel
	Indicates how many levels the event can propagate. More...

Protected Attributes inherited from wxObject
wxObjectRefData *	m_refData
	Pointer to an object which is the object's reference-counted data. More...

Member Enumeration Documentation

enum wxHelpEvent::Origin

Indicates how a wxHelpEvent was generated.

Enumerator
Origin_Unknown	unrecognized event source.
Origin_Keyboard	event generated from F1 key press.
Origin_HelpButton	event generated by wxContextHelp or from the [?] button on the title bar (Windows).

Constructor & Destructor Documentation

wxHelpEvent::wxHelpEvent	(	wxEventType	type = `wxEVT_NULL`,
		wxWindowID	winid = `0`,
		const wxPoint &	pt = `wxDefaultPosition`,
		wxHelpEvent::Origin	origin = `Origin_Unknown`
	)

Constructor.

Member Function Documentation

wxHelpEvent::Origin wxHelpEvent::GetOrigin ( ) const

Returns the origin of the help event which is one of the wxHelpEvent::Origin values.

The application may handle events generated using the keyboard or mouse differently, e.g. by using wxGetMousePosition() for the mouse events.

See also: SetOrigin()

const wxPoint& wxHelpEvent::GetPosition ( ) const

Returns the left-click position of the mouse, in screen coordinates.

This allows the application to position the help appropriately.

void wxHelpEvent::SetOrigin ( wxHelpEvent::Origin origin )

Set the help event origin, only used internally by wxWidgets normally.

See also: GetOrigin()

void wxHelpEvent::SetPosition ( const wxPoint & pt )

Sets the left-click position of the mouse, in screen coordinates.

Detailed Description

Events using this class

Public Types

Public Member Functions

Additional Inherited Members

Member Enumeration Documentation

Constructor & Destructor Documentation

Member Function Documentation