wxScrollEvent Class Reference

#include <wx/event.h>

Inheritance diagram for wxScrollEvent:

Detailed Description

A scroll event holds information about events sent from stand-alone scrollbars (see wxScrollBar) and sliders (see wxSlider).

Note that scrolled windows send the wxScrollWinEvent which does not derive from wxCommandEvent, but from wxEvent directly - don't confuse these two kinds of events and use the event table macros mentioned below only for the scrollbar-like controls.

The difference between EVT_SCROLL_THUMBRELEASE and EVT_SCROLL_CHANGED

The EVT_SCROLL_THUMBRELEASE event is only emitted when actually dragging the thumb using the mouse and releasing it (This EVT_SCROLL_THUMBRELEASE event is also followed by an EVT_SCROLL_CHANGED event).

The EVT_SCROLL_CHANGED event also occurs when using the keyboard to change the thumb position, and when clicking next to the thumb (In all these cases the EVT_SCROLL_THUMBRELEASE event does not happen).

In short, the EVT_SCROLL_CHANGED event is triggered when scrolling/ moving has finished independently of the way it had started. Please see the widgets sample ("Slider" page) to see the difference between EVT_SCROLL_THUMBRELEASE and EVT_SCROLL_CHANGED in action.

Remarks

Note that unless specifying a scroll control identifier, you will need to test for scrollbar orientation with wxScrollEvent::GetOrientation, since horizontal and vertical scroll events are processed using the same event handler.

Events using this class

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

void handlerFuncName(wxScrollEvent& event)

Event macros:

You can use EVT_COMMAND_SCROLL... macros with window IDs for when intercepting scroll events from controls, or EVT_SCROLL... macros without window IDs for intercepting scroll events from the receiving window – except for this, the macros behave exactly the same.

• EVT_SCROLL(func):
  Process all scroll events.
• EVT_SCROLL_TOP(func):
  Process wxEVT_SCROLL_TOP scroll-to-top events (minimum position).
• EVT_SCROLL_BOTTOM(func):
  Process wxEVT_SCROLL_BOTTOM scroll-to-bottom events (maximum position).
• EVT_SCROLL_LINEUP(func):
  Process wxEVT_SCROLL_LINEUP line up events.
• EVT_SCROLL_LINEDOWN(func):
  Process wxEVT_SCROLL_LINEDOWN line down events.
• EVT_SCROLL_PAGEUP(func):
  Process wxEVT_SCROLL_PAGEUP page up events.
• EVT_SCROLL_PAGEDOWN(func):
  Process wxEVT_SCROLL_PAGEDOWN page down events.
• EVT_SCROLL_THUMBTRACK(func):
  Process wxEVT_SCROLL_THUMBTRACK thumbtrack events (frequent events sent as the user drags the thumbtrack).
• EVT_SCROLL_THUMBRELEASE(func):
  Process wxEVT_SCROLL_THUMBRELEASE thumb release events.
• EVT_SCROLL_CHANGED(func):
  Process wxEVT_SCROLL_CHANGED end of scrolling events (MSW only).
• EVT_COMMAND_SCROLL(id, func):
  Process all scroll events.
• EVT_COMMAND_SCROLL_TOP(id, func):
  Process wxEVT_SCROLL_TOP scroll-to-top events (minimum position).
• EVT_COMMAND_SCROLL_BOTTOM(id, func):
  Process wxEVT_SCROLL_BOTTOM scroll-to-bottom events (maximum position).
• EVT_COMMAND_SCROLL_LINEUP(id, func):
  Process wxEVT_SCROLL_LINEUP line up events.
• EVT_COMMAND_SCROLL_LINEDOWN(id, func):
  Process wxEVT_SCROLL_LINEDOWN line down events.
• EVT_COMMAND_SCROLL_PAGEUP(id, func):
  Process wxEVT_SCROLL_PAGEUP page up events.
• EVT_COMMAND_SCROLL_PAGEDOWN(id, func):
  Process wxEVT_SCROLL_PAGEDOWN page down events.
• EVT_COMMAND_SCROLL_THUMBTRACK(id, func):
  Process wxEVT_SCROLL_THUMBTRACK thumbtrack events (frequent events sent as the user drags the thumbtrack).
• EVT_COMMAND_SCROLL_THUMBRELEASE(func):
  Process wxEVT_SCROLL_THUMBRELEASE thumb release events.
• EVT_COMMAND_SCROLL_CHANGED(func):
  Process wxEVT_SCROLL_CHANGED end of scrolling events (MSW only).

Library:  wxCore

Category:  Events

See Also

wxScrollBar, wxSlider, wxSpinButton, wxScrollWinEvent, Events and Event Handling

Public Member Functions
	wxScrollEvent (wxEventType commandType=wxEVT_NULL, int id=0, int pos=0, int orientation=0)
	Constructor.
int	GetOrientation () const
	Returns wxHORIZONTAL or wxVERTICAL, depending on the orientation of the scrollbar.
int	GetPosition () const
	Returns the position of the scrollbar.
void	SetOrientation (int orient)
void	SetPosition (int pos)
Public Member Functions inherited from wxCommandEvent
	wxCommandEvent (wxEventType commandEventType=wxEVT_NULL, int id=0)
	Constructor.
void *	GetClientData () const
	Returns client data pointer for a listbox or choice selection event (not valid for a deselection).
wxClientData *	GetClientObject () const
	Returns client object pointer for a listbox or choice selection event (not valid for a deselection).
long	GetExtraLong () const
	Returns extra information dependent on the event objects type.
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.
int	GetSelection () const
	Returns item index for a listbox or choice selection event (not valid for a deselection).
wxString	GetString () const
	Returns item string for a listbox or choice selection event.
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.
bool	IsSelection () const
	For a listbox or similar event, returns true if it is a selection, false if it is a deselection.
void	SetClientData (void *clientData)
	Sets the client data for this event.
void	SetClientObject (wxClientData *clientObject)
	Sets the client object for this event.
void	SetExtraLong (long extraLong)
	Sets the m_extraLong member.
void	SetInt (int intCommand)
	Sets the m_commandInt member.
void	SetString (const wxString &string)
	Sets the m_commandString member.
Public Member Functions inherited from wxEvent
	wxEvent (int id=0, wxEventType eventType=wxEVT_NULL)
	Constructor.
virtual wxEvent *	Clone () const =0
	Returns a copy of the event.
wxObject *	GetEventObject () const
	Returns the object (usually a window) associated with the event, if any.
wxEventType	GetEventType () const
	Returns the identifier of the given event type, such as wxEVT_BUTTON.
virtual wxEventCategory	GetEventCategory () const
	Returns a generic category for this event.
int	GetId () const
	Returns the identifier associated with this event, such as a button command id.
wxObject *	GetEventUserData () const
	Return the user data associated with a dynamically connected event handler.
bool	GetSkipped () const
	Returns true if the event handler should be skipped, false otherwise.
long	GetTimestamp () const
	Gets the timestamp for the event.
bool	IsCommandEvent () const
	Returns true if the event is or is derived from wxCommandEvent else it returns false.
void	ResumePropagation (int propagationLevel)
	Sets the propagation level to the given value (for example returned from an earlier call to wxEvent::StopPropagation).
void	SetEventObject (wxObject *object)
	Sets the originating object.
void	SetEventType (wxEventType type)
	Sets the event type.
void	SetId (int id)
	Sets the identifier associated with this event, such as a button command id.
void	SetTimestamp (long timeStamp=0)
	Sets the timestamp for the event.
bool	ShouldPropagate () const
	Test if this event should be propagated or not, i.e. if the propagation level is currently greater than 0.
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.
int	StopPropagation ()
	Stop the event from propagating to its parent window.
Public Member Functions inherited from wxObject
	wxObject ()
	Default ctor; initializes to NULL the internal reference data.
	wxObject (const wxObject &other)
	Copy ctor.
virtual	~wxObject ()
	Destructor.
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).
wxObjectRefData *	GetRefData () const
	Returns the wxObject::m_refData pointer, i.e. the data referenced by this object.
bool	IsKindOf (const wxClassInfo *info) const
	Determines whether this class is a subclass of (or the same class as) the given class.
bool	IsSameAs (const wxObject &obj) const
	Returns true if this object has the same data pointer as obj.
void	Ref (const wxObject &clone)
	Makes this object refer to the data in clone.
void	SetRefData (wxObjectRefData *data)
	Sets the wxObject::m_refData pointer.
void	UnRef ()
	Decrements the reference count in the associated data, and if it is zero, deletes the data.
void	UnShare ()
	This is the same of AllocExclusive() but this method is public.
void	operator delete (void *buf)
	The delete operator is defined for debugging versions of the library only, when the identifier WXDEBUG is defined.
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.

Additional Inherited Members
Protected Member Functions inherited from wxObject
void	AllocExclusive ()
	Ensure that this object's data is not shared with any other object.
virtual wxObjectRefData *	CreateRefData () const
	Creates a new instance of the wxObjectRefData-derived class specific to this object and returns it.
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.
Protected Attributes inherited from wxEvent
int	m_propagationLevel
	Indicates how many levels the event can propagate.

Constructor & Destructor Documentation

wxScrollEvent::wxScrollEvent	(	wxEventType	commandType = wxEVT_NULL,
		int	id = 0,
		int	pos = 0,
		int	orientation = 0
	)

Constructor.

Member Function Documentation

int wxScrollEvent::GetOrientation

(

)

const

Returns wxHORIZONTAL or wxVERTICAL, depending on the orientation of the scrollbar.

int wxScrollEvent::GetPosition

(

)

const

Returns the position of the scrollbar.

void wxScrollEvent::SetOrientation

(

int

orient

)

void wxScrollEvent::SetPosition

(

int

pos

)