Duncan McIntyre / SimpleGUITouchScreen

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Dependents:   TouchScreenGUIDemo

TouchScreenEventSource.cpp@1:6fb3545bddf7, 2016-03-25 (annotated)

Committer:
duncanFrance
Date:
Fri Mar 25 16:48:32 2016 +0000
Revision:
1:6fb3545bddf7
Parent:
0:b250e56f3514
Child:
3:45777fe81448
Full TouchScreenEventSource implementation

Who changed what in which revision?

UserRevisionLine numberNew contents of line
duncanFrance 0:b250e56f3514 1 #include "TouchScreenEventSource.h"
duncanFrance 0:b250e56f3514 2 /**
duncanFrance 0:b250e56f3514 3 * Implementation of TouchScreenEventSource which adds timers to detect and dispatch
duncanFrance 0:b250e56f3514 4 * tap and double-tap events
duncanFrance 0:b250e56f3514 5 **/
duncanFrance 0:b250e56f3514 6
duncanFrance 1:6fb3545bddf7 7 TouchScreenEventSource::TouchScreenEventSource(TouchScreen* touchScreen, EventDispatcher* dispatcher)
duncanFrance 1:6fb3545bddf7 8 : EventSource(dispatcher), _touchScreen(touchScreen), _state(Idle)
duncanFrance 0:b250e56f3514 9 {
duncanFrance 0:b250e56f3514 10 }
duncanFrance 0:b250e56f3514 11
duncanFrance 0:b250e56f3514 12 void TouchScreenEventSource::touchStartHandler(TouchPosition p)
duncanFrance 0:b250e56f3514 13 {
duncanFrance 1:6fb3545bddf7 14 if(_state == Idle) {
duncanFrance 1:6fb3545bddf7 15 // see if we get the touchEnd event before the timeout
duncanFrance 1:6fb3545bddf7 16 _state = SingleTimer;
duncanFrance 1:6fb3545bddf7 17 _timeout.attach_us(this, &TouchScreenEventSource::_timeoutHandler, TAP_TIMEOUT_MICROS);
duncanFrance 1:6fb3545bddf7 18 }
duncanFrance 1:6fb3545bddf7 19
duncanFrance 1:6fb3545bddf7 20 Event e;
duncanFrance 1:6fb3545bddf7 21 e.screenX = p.screenX;
duncanFrance 1:6fb3545bddf7 22 e.screenY = p.screenY;
duncanFrance 1:6fb3545bddf7 23 e.type = touchStartEvent;
duncanFrance 1:6fb3545bddf7 24 _dispatcher->dispatchEvent(e);
duncanFrance 0:b250e56f3514 25 }
duncanFrance 0:b250e56f3514 26
duncanFrance 0:b250e56f3514 27 void TouchScreenEventSource::touchMoveHandler(TouchPosition p)
duncanFrance 0:b250e56f3514 28 {
duncanFrance 1:6fb3545bddf7 29
duncanFrance 1:6fb3545bddf7 30 Event e;
duncanFrance 1:6fb3545bddf7 31 e.screenX = p.screenX;
duncanFrance 1:6fb3545bddf7 32 e.screenY = p.screenY;
duncanFrance 1:6fb3545bddf7 33 e.type = touchMoveEvent;
duncanFrance 1:6fb3545bddf7 34 _dispatcher->dispatchEvent(e);
duncanFrance 0:b250e56f3514 35 }
duncanFrance 0:b250e56f3514 36
duncanFrance 0:b250e56f3514 37 void TouchScreenEventSource::touchEndHandler(TouchPosition p)
duncanFrance 0:b250e56f3514 38 {
duncanFrance 1:6fb3545bddf7 39 // Work out what events we need before we dispatch them, so the handler doesn't interfere with any timers
duncanFrance 1:6fb3545bddf7 40 Event endEvent;
duncanFrance 1:6fb3545bddf7 41 Event tapEvent;
duncanFrance 1:6fb3545bddf7 42 bool tapped = false;
duncanFrance 1:6fb3545bddf7 43
duncanFrance 1:6fb3545bddf7 44 // We always want to dispatch a touchEndEvent
duncanFrance 1:6fb3545bddf7 45 endEvent.screenX = p.screenX;
duncanFrance 1:6fb3545bddf7 46 endEvent.screenY = p.screenY;
duncanFrance 1:6fb3545bddf7 47 endEvent.type = touchEndEvent;
duncanFrance 1:6fb3545bddf7 48
duncanFrance 1:6fb3545bddf7 49 tapEvent.screenX = p.screenX;
duncanFrance 1:6fb3545bddf7 50 tapEvent.screenY = p.screenY;
duncanFrance 1:6fb3545bddf7 51
duncanFrance 1:6fb3545bddf7 52 // We'll want a touchTapEvent if we haven't timed out and we're looking for it
duncanFrance 1:6fb3545bddf7 53 if(_state == SingleTimer) {
duncanFrance 1:6fb3545bddf7 54 // Reset the timer to look for a double-tap
duncanFrance 1:6fb3545bddf7 55 _timeout.attach_us(this, &TouchScreenEventSource::_timeoutHandler, DOUBLE_TAP_TIMEOUT_MICROS);
duncanFrance 1:6fb3545bddf7 56 _state = DoubleTimer;
duncanFrance 1:6fb3545bddf7 57
duncanFrance 1:6fb3545bddf7 58 tapEvent.type = touchTapEvent;
duncanFrance 1:6fb3545bddf7 59 tapped = true;
duncanFrance 1:6fb3545bddf7 60 } else if(_state == DoubleTimer) {
duncanFrance 1:6fb3545bddf7 61
duncanFrance 1:6fb3545bddf7 62 _timeout.detach();
duncanFrance 1:6fb3545bddf7 63 _state = Idle;
duncanFrance 1:6fb3545bddf7 64
duncanFrance 1:6fb3545bddf7 65 tapEvent.type = touchDoubleTapEvent;
duncanFrance 1:6fb3545bddf7 66 tapped = true;
duncanFrance 1:6fb3545bddf7 67 }
duncanFrance 1:6fb3545bddf7 68
duncanFrance 1:6fb3545bddf7 69 _dispatcher->dispatchEvent(endEvent);
duncanFrance 1:6fb3545bddf7 70
duncanFrance 1:6fb3545bddf7 71 if(tapped) {
duncanFrance 1:6fb3545bddf7 72 _dispatcher->dispatchEvent(tapEvent);
duncanFrance 1:6fb3545bddf7 73 }
duncanFrance 1:6fb3545bddf7 74 }
duncanFrance 1:6fb3545bddf7 75
duncanFrance 1:6fb3545bddf7 76 void TouchScreenEventSource::_timeoutHandler() {
duncanFrance 1:6fb3545bddf7 77 // Timed out waiting for whatever, so clear the state
duncanFrance 1:6fb3545bddf7 78 _state = Idle;
duncanFrance 0:b250e56f3514 79 }