User interface device

A user interface device comprising:

• an operation receiving processing circuitry to receive an operation on a screen on which a GUI component being a graphical user interface is displayed;
• a processor to execute a program;
• a memory to store the program which, when executed by the processor, performs processes of,
• detecting, as an event, the operation received by the operation receiving processing circuitry, while propagating the operation from a current GUI component to be operated toward a parent GUI component on a basis of a tree structure of the GUI components;
• and
• when the event detected is an event accompanied by notification of haptic feedback stimulating tactile sense of a user, determining whether or not to permit the notification of haptic feedback, on a basis of a reason for the notification of haptic feedback as a result of the event detected;
• and
• a feedback notifying processing circuitry to provide the notification of haptic feedback when a determination result indicates permission of the notification, wherein
• the processes further include, for one operation received by the operation receiving processing circuitry, each time an event is successively detected from the GUI component to be operated toward the parent GUI component in the tree structure of the GUI components, determining whether or not the detected event is an event accompanied by notification of haptic feedback, and storing the detected event in a first-in first-out queue when the detected event is the event accompanied by notification of haptic feedback,
• and under a condition where two or more events are stored in the queue, determining whether or not to permit notification of haptic feedback on a basis of reasons for notification of haptic feedback as a result of the respective events, and determining notification of haptic feedback to be finally provided.