IlvAccelerator Class Reference

Base class for accelerators. More...

#include <ilviews/util/accel.h>

Inheritance diagram for IlvAccelerator:

Public Member Functions
IlUShort	data () const
	Gets the event data. More...
IlBoolean	match (IlvEventType type, IlUShort data, IlUShort modifiers) const
	Tests if two accelerator descriptions are equivalent. More...
IlUShort	modifiers () const
	Gets the modifiers. More...
IlUShort	modMask () const
	Gets the modifiers to ignore. More...
void	setModMask (IlUShort modifiersToIgnore)
	Sets the modifiers to ignore. More...
IlBoolean	trigger (IlvEventType type, IlUShort data, IlUShort modifiers) const
	Tests if an event triggers an accelerator. More...
IlvEventType	type () const
	Gets the event type. More...
IlAny	userArg () const
	Gets the user argument. More...

Detailed Description

Base class for accelerators.

Library: views

This abstract class provides a way to handle an application accelerator, that is, an action and an event description that specify how the action must be triggered.
The event description is represented by the following data members:

• type(): the event type, that is, IlvKeyDown, IlvButtonUp, and so on.
• data(): the event data. This value depends on the event type. For instance, it could be b or IlvTab for an IlvKeyDown event, or it could be IlvLeftButton for an IlvButtonDown event.
• modifiers(): a set of mandatory modifiers. This is an OR combination of modifier values, for instance, IlvCtrlModifier IlvLeftButton.
• modMask(): a modifier mask, that is, a set of modifiers to ignore. This, too, is an OR combination.

If a modifier value is found in both modifiers() and modMask(), its value is removed from modMask(), which means that this modifier remains mandatory to trigger the accelerator.
An accelerator on the IlvButtonDragged event can be triggered only if its members data and modifiers have the same value. For instance:

• type():      IlvButtonDragged
• data():      IlvButtonLeft
• modifiers(): IlvButtonLeft

Generally speaking, an IlvButtonDragged event is always associated with a modifier. The Rogue Wave Views behavior in this specific case mimics the X11 behavior, meaning the modifiers field contains flags for the mouse buttons.
This class does not provide prototype or storage for the accelerator action itself; this must be done in the subclasses because they need specific signatures. However, it provides storage for a user argument that can be used by subclasses as a parameter for the action.
IlvAccelerator provides methods to determine if a given event description matches the accelerator internal description.
This class has no constructor – the constructor is protected. Subclasses must provide a public constructor.

See Also

IlvContainerAccelerator, IlvManagerAccelerator.

Member Function Documentation

IlUShort IlvAccelerator::data

(

)

const

Gets the event data.

Returns

The event data associated with the accelerator.

IlBoolean IlvAccelerator::match	(	IlvEventType	type,
		IlUShort	data,
		IlUShort	modifiers
	)		const

Tests if two accelerator descriptions are equivalent.

This member function is only used by subclasses to determine if two accelerator descriptions are equivalent. Ideally, there should not be two equivalent accelerators in the same accelerator set. This function ignores the modifier mask member.

Parameters

type	The event type.
data	The event data.
modifiers	The set of mandatory modifiers.

Returns

IlTrue if the accelerator is equivalent to the event description. Otherwise, returns IlFalse.

IlUShort IlvAccelerator::modifiers

(

)

const

Gets the modifiers.

Returns

The set of modifiers (OR combination) associated with the accelerator.

IlUShort IlvAccelerator::modMask

(

)

const

Gets the modifiers to ignore.

Returns

The modifiers to ignore.

void IlvAccelerator::setModMask

(

IlUShort

modifiersToIgnore

)

Sets the modifiers to ignore.

Sets the modifiers to ignore. This function can be called only after the modifiers are set.

Parameters

modifiersToIgnore

The modifier mask.

IlBoolean IlvAccelerator::trigger	(	IlvEventType	type,
		IlUShort	data,
		IlUShort	modifiers
	)		const

Tests if an event triggers an accelerator.

Parameters

type	The event type.
data	The event data.
modifiers	The set of mandatory modifiers.

Returns

IlTrue if the event description given in parameter triggers the accelerator action. This happens if, and only if:

• type is equal to type()
• and data is equal to data()
• and modifiers is a superset of modifiers() and a subset of modifiers() + modMask() (that is, modifiers contains all the required modifiers and possibly some others from modMask()).

IlvEventType IlvAccelerator::type

(

)

const

Gets the event type.

Returns

The event type associated with the accelerator.

IlAny IlvAccelerator::userArg

(

)

const

Gets the user argument.

Returns

The user argument. This returned argument is used as a parameter to call the action, if so specified in the subclasses.