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Page Revision: 2012/01/24 18:24

Button element detects button presses and releases on standard input devices supported by DirectInput API. Such devices include keyboard, mouse, and a variety of joysticks and gamepads. The element collects timing statistics and, therefore is a default choice for recording of participant responses. The element allows using multiple input devices in parallel.

Table of Contents [Hide/Show] Description Snapshots Practical use Note Properties     Generic properties

Description ¶

Snapshots ¶

Snapshot 1

Snapshot 2

Practical use ¶

The typical usage for the button element is detection of particular participant responses. However, you can use the button elements to provide operator's feedback to an experiment (for example, adjusting the experimental parameters with a keyboard at the runtime)

Note ¶

The default settings allow detection only of the first button press. The following presses will be ignored. Change properties in the BEHAVIOUR group according to your requirements.)))

Properties ¶

Generic properties ¶

Name	Description	Attributes	Value Type
Control
Button	Selection of the button for the element. Button name can be selected from a list or, be detected. For the detecton move mouse over the web icon and press the selected button on your input device.	Design-time action
Input device	Selected input device from a list of all DirectInput devices currently connected to a computer.	Design-time action
Runtime info
Is down	Indicates if the selected button is being physically pressed (the element is not necessarily triggered)	R, Read-only	Boolean
Statistics
Last hit time	Indicates the time (ms) from the current activation of the parent event when the button was triggered last time. This property is recommended for getting the accurate reaction time data.	Runtime command	UInt64
Was triggered	Indicates if the element has been triggered at least once starting from the current activation of the parent event	Runtime command	Boolean
Behavior
Trigger on release	Defines if the element obtains the triggered status only when the pressed button is released. Otherwise, the element will be triggered immediately as the button is down.	D,R	Boolean
One trigger only	Defines if the element can be triggered only once. After that all button pressed are ignored till the new activation of the parent event. If false, multiple button presses and triggering are allowed.	D,R	Boolean

+=== Properties inherited from clElement === Inherited properties of clElement

Name	Description	Constraints	Value Type	Upon Change
Control
Is Enabled	If set to false the element is completely omitted when the experiment is run.	Design Time..	Boolean
Title	Title of the element.	Design Time..	String