6663b6c9
 adorian
projet complet av...
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#include <ion.h>
#include <assert.h>
namespace Ion {
namespace Events {
static bool sleepWithTimeout(int duration, int * timeout) {
if (*timeout >= duration) {
msleep(duration);
*timeout -= duration;
return false;
} else {
msleep(*timeout);
*timeout = 0;
return true;
}
}
Event sLastEvent = Events::None;
Keyboard::State sLastKeyboardState;
bool sEventIsRepeating = 0;
constexpr int delayBeforeRepeat = 200;
constexpr int delayBetweenRepeat = 50;
bool canRepeatEvent(Event e) {
return (e == Events::Left || e == Events::Up || e == Events::Down || e == Events::Right || e == Events::Backspace);
}
Event getEvent(int * timeout) {
assert(*timeout > delayBeforeRepeat);
assert(*timeout > delayBetweenRepeat);
int time = 0;
uint64_t keysSeenUp = 0;
uint64_t keysSeenTransitionningFromUpToDown = 0;
while (true) {
Keyboard::State state = Keyboard::scan();
keysSeenUp |= ~state;
keysSeenTransitionningFromUpToDown = keysSeenUp & state;
if (keysSeenTransitionningFromUpToDown != 0) {
sEventIsRepeating = false;
/* The key that triggered the event corresponds to the first non-zero bit
* in "match". This is a rather simple logic operation for the which many
* processors have an instruction (ARM thumb uses CLZ).
* Unfortunately there's no way to express this in standard C, so we have
* to resort to using a builtin function. */
Keyboard::Key key = (Keyboard::Key)(63-__builtin_clzll(keysSeenTransitionningFromUpToDown));
Event event(key, isShiftActive(), isAlphaActive());
updateModifiersFromEvent(event);
sLastEvent = event;
sLastKeyboardState = state;
return event;
}
if (sleepWithTimeout(10, timeout)) {
// Timeout occured
return Events::None;
}
time += 10;
// At this point, we know that keysSeenTransitionningFromUpToDown has *always* been zero
// In other words, no new key has been pressed
if (canRepeatEvent(sLastEvent) && (state == sLastKeyboardState)) {
int delay = (sEventIsRepeating ? delayBetweenRepeat : delayBeforeRepeat);
if (time >= delay) {
sEventIsRepeating = true;
sLastKeyboardState = state;
return sLastEvent;
}
}
}
}
}
}
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