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Getting Touch Events to Play Nice in Flex

Getting Touch Events to Play Nice in Flex. Ryan Frishberg Software Consultant, Lab49 http://www.frishy.com. About Me…About You. Former Flex SDK Engineer Currently consultant at Lab49 UK. Flash Touch Basics. f lash.ui.MultitouchInputMode TOUCH_POINT GESTURE NONE. Flash Touch Basics.

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Getting Touch Events to Play Nice in Flex

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  1. GettingTouchEvents to Play Nice in Flex Ryan Frishberg Software Consultant, Lab49 http://www.frishy.com

  2. About Me…About You • Former Flex SDK Engineer • Currently consultant at Lab49 UK

  3. Flash Touch Basics • flash.ui.MultitouchInputMode • TOUCH_POINT • GESTURE • NONE

  4. Flash TouchBasics • flash.events.TouchEvent • BEGIN • END • MOVE • touchEvent • touchPointID • isPrimaryTouchPoint • pressure • sizeX • sizeY

  5. Flash TouchBasics • flash.events.GestureEvent • GESTURE_TWO_FINGER_TAP • flash.events.GestureTransformEvent • GESTURE_PAN • GESTURE_ROTATE • GESTURE_ZOOM • GESTURE_SWIPE • flash.events.PressAndTapGestureEvent • PRESS_AND_TAP_GESTURE_EVENT

  6. Flex TouchBasics • MultiTouch.inputModecontrolswhat Flash eventsyouget • UIComponent.interactionMode style controls how the Flex components respond to thoseevents • mx.core.InteractionMode • TOUCH • MOUSE • New down state for item renderers • Down vs selected: Down shows intent to click, selected shows item selection(s). To show both in mobile, use an item rendererwith a checkmark

  7. Multi-select Item RenderersExample

  8. WhyisTouchDifficult • Toucheventscanbeinaccurate • Interactions are asynchronous and ambiguous • Whointerpretswhatwasmeant? • Components need to coordinatetogether

  9. Buttonclicks in a touch-world • User presses down on a button • Are theyattempting to touch the button or start scrolling? • When do we show a down state on the Button? • What if the user starts scrolling later? • What if the user presses on the buttonquickly – how does the user receiveany feedback?

  10. Touch-cancellationBehaviors • MouseEvents are bubbled up. • Whena component seesa mouse event or series of mouse eventstheywant to interpret, the component shoulddispatchTouchInteractionEvents • ThreeTouchInteractionEvents: • STARTING, START, END

  11. Buttons inside item renderers • Not just a touch issue! Issues occurwith mouse as well • event.preventDefault() isyourfriend

  12. AddingSwipeGesture • Listen for GestureEvent • Listenfor otherTouchInteractionSTARTs and ENDs – can’tinterruptanotherSTART • Once swipeoccurs, dispatch a STARTING, and if not cancelled, dispatch a START (and then an END sinceit’s not asynchronous

  13. Questions

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