![]() ![]() The inc() and dec() methods in the Gesture Events example are used to provide a visual cue that an object is the target of a gesture. If the method returns true, the event was generated by a touch instead of by a mouse. Use the isSynthesized() method to determine the source of the mouse event. For example, touching an object generates both TOUCH_PRESSED and MOUSE_PRESSED events. Touches on a touch screen also generate corresponding mouse events. You can use this information to provide different behavior based on the source of the event. ![]() If the method returns true, the event was generated by a gesture on a touch screen. Use the isDirect() method to identify the source of the event. ![]() SCROLL events are also generated by the mouse wheel. If the method returns true, the event was generated after the gesture was completed.Įvents are generated by gestures on a touch screen or on a trackpad. Use the isInertia() method to identify the events that are generated based on the inertia of the gesture. For example, SCROLL events might be generated after the SCROLL_FINISHED event if there is any inertia associated with the scroll gesture. On platforms that support inertia for gestures, additional events might be generated after the event-type _FINISHED event. For all types of events, an entry is posted to the log of events. ![]() In general, event handlers for the shape objects in the Gesture Events example perform similar operations for each type of event that is handled. You can use the isSynthesized() method for mouse events to determine if the event was generated by mouse movement or movement on a touch screen and only handle the event once. For example, if a gesture generates scroll events and drag events and you provide the same processing for handlers of both types of events, the movement on the screen could be twice the amount expected. If your application handles touches, gestures, and mouse events, make sure that you do not handle a single action multiple times. Even if your application does not handle touch or gesture events directly, it can run on a touch-enabled device with minimal changes by responding to the mouse events that are generated in response to touches. Moving a single point on the screen generates scroll events and drag events. For example, touching a point on the screen generates TOUCH_PRESSED and MOUSE_PRESSED events. The target of a swipe event is the node at the center of the entire path of the gesture. The target of a scroll event is the node at the point where the gesture started. Depending on the length of the swipe, it is possible that the swipe and scroll events have different targets. A swipe gesture generates scroll events in addition to the swipe event. Gestures and touches can generate other types of events in addition to the events for the gesture or touch performed. For more information on touch events, see Working with Touch Events. These events can be used to provide lower level tracking for the individual touch points that are part of a touch or gesture. Touch events are generated when the application is running on a device with a touch screen and the user touches one or more fingers to the screen. Two-finger pinching motion where fingers are brought together to zoom out and fingers are moved apart to zoom in. SCROLL_STARTED, SCROLL, and SCROLL_FINISHED events are also generated. Diagonal movement is not recognized as a swipe.Ī single swipe event is generated for each swiping gesture. Sweeping movement across the screen or trackpad to the right, left, up, or down. If a mouse wheel is used for scrolling, only the events of type SCROLL are generated. Sliding movement, up or down for vertical scrolling, left or right for horizontal scrolling. Two-finger turning movement where one finger moves clockwise around the other finger to rotate an object clockwise and one finger moves counterclockwise around the other finger to rotate an object counterclockwise. Table 5-1 Supported Gestures and Generated Event Types Gesture Handling Concurrent Touch Points Independently.Additional Events Generated from Touches.Touch Point Targets and Touch Event Targets.Registering and Removing an Event Handlerĥ Working with Events from Touch-Enabled Devices.Filters for the Draggable Panels Example.Registering and Removing an Event Filter. ![]()
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