Duncan McIntyre / SimpleGUITouchScreen

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Dependents:   TouchScreenGUIDemo

TouchScreenEventSource.cpp@4:0be0d6a61e90, 2016-05-17 (annotated)

Committer:
duncanFrance
Date:
Tue May 17 16:28:53 2016 +0000
Revision:
4:0be0d6a61e90
Parent:
3:45777fe81448
Child:
5:e3084e17e8e6
Removed unused event type definitions

Who changed what in which revision?

UserRevisionLine numberNew contents of line
duncanFrance 0:b250e56f3514 1 #include "TouchScreenEventSource.h"
duncanFrance 3:45777fe81448 2 #include "EventType.h"
duncanFrance 3:45777fe81448 3
duncanFrance 0:b250e56f3514 4 /**
duncanFrance 0:b250e56f3514 5 * Implementation of TouchScreenEventSource which adds timers to detect and dispatch
duncanFrance 0:b250e56f3514 6 * tap and double-tap events
duncanFrance 0:b250e56f3514 7 **/
duncanFrance 0:b250e56f3514 8
duncanFrance 3:45777fe81448 9 TouchScreenEventSource::TouchScreenEventSource(TouchScreen* touchScreen, GUI* gui)
duncanFrance 3:45777fe81448 10 : EventSource(gui), _touchScreen(touchScreen), _state(Idle)
duncanFrance 0:b250e56f3514 11 {
duncanFrance 4:0be0d6a61e90 12 _touchScreen->setTouchStartHandler(this, &TouchScreenEventSource::touchStartHandler);
duncanFrance 4:0be0d6a61e90 13 _touchScreen->setTouchEndHandler(this, &TouchScreenEventSource::touchEndHandler);
duncanFrance 4:0be0d6a61e90 14 _touchScreen->setTouchMoveHandler(this, &TouchScreenEventSource::touchMoveHandler);
duncanFrance 0:b250e56f3514 15 }
duncanFrance 0:b250e56f3514 16
duncanFrance 0:b250e56f3514 17 void TouchScreenEventSource::touchStartHandler(TouchPosition p)
duncanFrance 0:b250e56f3514 18 {
duncanFrance 1:6fb3545bddf7 19 if(_state == Idle) {
duncanFrance 1:6fb3545bddf7 20 // see if we get the touchEnd event before the timeout
duncanFrance 1:6fb3545bddf7 21 _state = SingleTimer;
duncanFrance 1:6fb3545bddf7 22 _timeout.attach_us(this, &TouchScreenEventSource::_timeoutHandler, TAP_TIMEOUT_MICROS);
duncanFrance 1:6fb3545bddf7 23 }
duncanFrance 1:6fb3545bddf7 24
duncanFrance 1:6fb3545bddf7 25 Event e;
duncanFrance 1:6fb3545bddf7 26 e.screenX = p.screenX;
duncanFrance 1:6fb3545bddf7 27 e.screenY = p.screenY;
duncanFrance 3:45777fe81448 28 e.type = TOUCH_START;
duncanFrance 3:45777fe81448 29 _gui->queueEvent(e);
duncanFrance 0:b250e56f3514 30 }
duncanFrance 0:b250e56f3514 31
duncanFrance 0:b250e56f3514 32 void TouchScreenEventSource::touchMoveHandler(TouchPosition p)
duncanFrance 0:b250e56f3514 33 {
duncanFrance 1:6fb3545bddf7 34
duncanFrance 1:6fb3545bddf7 35 Event e;
duncanFrance 1:6fb3545bddf7 36 e.screenX = p.screenX;
duncanFrance 1:6fb3545bddf7 37 e.screenY = p.screenY;
duncanFrance 3:45777fe81448 38 e.type = TOUCH_MOVE;
duncanFrance 3:45777fe81448 39 _gui->queueEvent(e);
duncanFrance 0:b250e56f3514 40 }
duncanFrance 0:b250e56f3514 41
duncanFrance 0:b250e56f3514 42 void TouchScreenEventSource::touchEndHandler(TouchPosition p)
duncanFrance 0:b250e56f3514 43 {
duncanFrance 1:6fb3545bddf7 44 // Work out what events we need before we dispatch them, so the handler doesn't interfere with any timers
duncanFrance 1:6fb3545bddf7 45 Event endEvent;
duncanFrance 1:6fb3545bddf7 46 Event tapEvent;
duncanFrance 1:6fb3545bddf7 47 bool tapped = false;
duncanFrance 1:6fb3545bddf7 48
duncanFrance 1:6fb3545bddf7 49 // We always want to dispatch a touchEndEvent
duncanFrance 1:6fb3545bddf7 50 endEvent.screenX = p.screenX;
duncanFrance 1:6fb3545bddf7 51 endEvent.screenY = p.screenY;
duncanFrance 3:45777fe81448 52 endEvent.type = TOUCH_END;
duncanFrance 1:6fb3545bddf7 53
duncanFrance 1:6fb3545bddf7 54 tapEvent.screenX = p.screenX;
duncanFrance 1:6fb3545bddf7 55 tapEvent.screenY = p.screenY;
duncanFrance 1:6fb3545bddf7 56
duncanFrance 1:6fb3545bddf7 57 // We'll want a touchTapEvent if we haven't timed out and we're looking for it
duncanFrance 1:6fb3545bddf7 58 if(_state == SingleTimer) {
duncanFrance 1:6fb3545bddf7 59 // Reset the timer to look for a double-tap
duncanFrance 1:6fb3545bddf7 60 _timeout.attach_us(this, &TouchScreenEventSource::_timeoutHandler, DOUBLE_TAP_TIMEOUT_MICROS);
duncanFrance 1:6fb3545bddf7 61 _state = DoubleTimer;
duncanFrance 1:6fb3545bddf7 62
duncanFrance 3:45777fe81448 63 tapEvent.type = TOUCH_TAP;
duncanFrance 1:6fb3545bddf7 64 tapped = true;
duncanFrance 1:6fb3545bddf7 65 } else if(_state == DoubleTimer) {
duncanFrance 1:6fb3545bddf7 66
duncanFrance 1:6fb3545bddf7 67 _timeout.detach();
duncanFrance 1:6fb3545bddf7 68 _state = Idle;
duncanFrance 1:6fb3545bddf7 69
duncanFrance 3:45777fe81448 70 tapEvent.type = TOUCH_DOUBLE_TAP;
duncanFrance 1:6fb3545bddf7 71 tapped = true;
duncanFrance 1:6fb3545bddf7 72 }
duncanFrance 1:6fb3545bddf7 73
duncanFrance 3:45777fe81448 74 _gui->queueEvent(endEvent);
duncanFrance 1:6fb3545bddf7 75
duncanFrance 1:6fb3545bddf7 76 if(tapped) {
duncanFrance 3:45777fe81448 77 _gui->queueEvent(tapEvent);
duncanFrance 1:6fb3545bddf7 78 }
duncanFrance 1:6fb3545bddf7 79 }
duncanFrance 1:6fb3545bddf7 80
duncanFrance 1:6fb3545bddf7 81 void TouchScreenEventSource::_timeoutHandler() {
duncanFrance 1:6fb3545bddf7 82 // Timed out waiting for whatever, so clear the state
duncanFrance 1:6fb3545bddf7 83 _state = Idle;
duncanFrance 0:b250e56f3514 84 }