Duncan McIntyre / SimpleGUITouchScreen

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Dependents:   TouchScreenGUIDemo

TouchScreenEventSource.cpp@3:45777fe81448, 2016-05-08 (annotated)

Committer:
duncanFrance
Date:
Sun May 08 14:42:59 2016 +0000
Revision:
3:45777fe81448
Parent:
1:6fb3545bddf7
Child:
4:0be0d6a61e90
Work with new SimpleGUI event mechanism

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