wxKeyboardState Class Reference

#include <wx/kbdstate.h>

Inheritance diagram for wxKeyboardState:

Detailed Description

Provides methods for testing the state of the keyboard modifier keys.

This class is used as a base class of wxKeyEvent and wxMouseState and, hence, indirectly, of wxMouseEvent, so its methods may be used to get information about the modifier keys which were pressed when the event occurred.

This class is implemented entirely inline in <wx/kbdstate.h> and thus has no linking requirements.

Library:  None; this class implementation is entirely header-based.

Category:  Events

See Also

wxKeyEvent, wxMouseState

Public Member Functions
	wxKeyboardState (bool controlDown=false, bool shiftDown=false, bool altDown=false, bool metaDown=false)
	Constructor initializes the modifier key settings.
int	GetModifiers () const
	Return the bit mask of all pressed modifier keys.
bool	HasAnyModifiers () const
	Returns true if any modifiers at all are pressed.
bool	HasModifiers () const
	Returns true if Control or Alt are pressed.
bool	ControlDown () const
	Returns true if the Control key or Apple/Command key under OS X is pressed.
bool	RawControlDown () const
	Returns true if the Control key (also under OS X).
bool	ShiftDown () const
	Returns true if the Shift key is pressed.
bool	MetaDown () const
	Returns true if the Meta/Windows/Apple key is pressed.
bool	AltDown () const
	Returns true if the Alt key is pressed.
bool	CmdDown () const
	Returns true if the key used for command accelerators is pressed.
void	SetControlDown (bool down)
void	SetRawControlDown (bool down)
void	SetShiftDown (bool down)
void	SetAltDown (bool down)
void	SetMetaDown (bool down)

Constructor & Destructor Documentation

wxKeyboardState::wxKeyboardState	(	bool	controlDown = false,
		bool	shiftDown = false,
		bool	altDown = false,
		bool	metaDown = false
	)

Constructor initializes the modifier key settings.

By default, no modifiers are active.

Member Function Documentation

bool wxKeyboardState::AltDown

(

)

const

Returns true if the Alt key is pressed.

Notice that GetModifiers() should usually be used instead of this one.

bool wxKeyboardState::CmdDown

(

)

const

Returns true if the key used for command accelerators is pressed.

Same as ControlDown(). Deprecated.

Notice that GetModifiers() should usually be used instead of this one.

bool wxKeyboardState::ControlDown

(

)

const

Returns true if the Control key or Apple/Command key under OS X is pressed.

This function doesn't distinguish between right and left control keys.

Notice that GetModifiers() should usually be used instead of this one.

int wxKeyboardState::GetModifiers

(

)

const

Return the bit mask of all pressed modifier keys.

The return value is a combination of wxMOD_ALT, wxMOD_CONTROL, wxMOD_SHIFT and wxMOD_META bit masks. Additionally, wxMOD_NONE is defined as 0, i.e. corresponds to no modifiers (see HasAnyModifiers()) and wxMOD_CMD is either wxMOD_CONTROL (MSW and Unix) or wxMOD_META (Mac), see CmdDown(). See wxKeyModifier for the full list of modifiers.

Notice that this function is easier to use correctly than, for example, ControlDown() because when using the latter you also have to remember to test that none of the other modifiers is pressed:

if ( ControlDown() && !AltDown() && !ShiftDown() && !MetaDown() )
    ... handle Ctrl-XXX ...

and forgetting to do it can result in serious program bugs (e.g. program not working with European keyboard layout where AltGr key which is seen by the program as combination of CTRL and ALT is used). On the other hand, you can simply write:

if ( GetModifiers() == wxMOD_CONTROL )
    ... handle Ctrl-XXX ...

with this function.

bool wxKeyboardState::HasAnyModifiers

(

)

const

Returns true if any modifiers at all are pressed.

This is equivalent to GetModifiers() != wxMOD_NONE.

Notice that this is different from HasModifiers() method which doesn't take e.g. Shift modifier into account. This method is most suitable for mouse events when any modifier, including Shift, can change the interpretation of the event.

Since

2.9.5

bool wxKeyboardState::HasModifiers

(

)

const

Returns true if Control or Alt are pressed.

Checks if Control, Alt or, under OS X only, Command key are pressed (notice that the real Control key is still taken into account under OS X too).

This method returns false if only Shift is pressed for compatibility reasons and also because pressing Shift usually doesn't change the interpretation of key events, see HasAnyModifiers() if you want to take Shift into account as well.

bool wxKeyboardState::MetaDown

(

)

const

Returns true if the Meta/Windows/Apple key is pressed.

This function tests the state of the key traditionally called Meta under Unix systems, Windows keys under MSW Notice that GetModifiers() should usually be used instead of this one.

See Also

CmdDown()

bool wxKeyboardState::RawControlDown

(

)

const

Returns true if the Control key (also under OS X).

This function doesn't distinguish between right and left control keys.

Notice that GetModifiers() should usually be used instead of this one.

void wxKeyboardState::SetAltDown

(

bool

down

)

void wxKeyboardState::SetControlDown

(

bool

down

)

void wxKeyboardState::SetMetaDown

(

bool

down

)

void wxKeyboardState::SetRawControlDown

(

bool

down

)

void wxKeyboardState::SetShiftDown

(

bool

down

)

bool wxKeyboardState::ShiftDown

(

)

const

Returns true if the Shift key is pressed.

This function doesn't distinguish between right and left shift keys.

Notice that GetModifiers() should usually be used instead of this one.