From c0a215282d12872cf32fb24f9067216c0f869b96 Mon Sep 17 00:00:00 2001
From: Tarek Soliman
Date: Thu, 1 Mar 2012 06:29:44 -0600
Subject: KEYMAPPER: Add delays for *UP events coming from non-keys

Delayed entries are in a queue where each entry stores how
many milliseconds should pass based on the last entry.
---
 backends/keymapper/keymapper.cpp | 29 +++++++++++++++++++++--------
 common/EventDispatcher.cpp       |  6 ++++++
 common/EventMapper.cpp           | 28 ++++++++++++++++++++++++++++
 common/events.h                  | 15 +++++++++++++++
 4 files changed, 70 insertions(+), 8 deletions(-)

diff --git a/backends/keymapper/keymapper.cpp b/backends/keymapper/keymapper.cpp
index 99bcb44179..dcb021f2d8 100644
--- a/backends/keymapper/keymapper.cpp
+++ b/backends/keymapper/keymapper.cpp
@@ -25,9 +25,14 @@
 #ifdef ENABLE_KEYMAPPER
 
 #include "common/config-manager.h"
+#include "common/system.h"
 
 namespace Common {
 
+// These magic numbers are provided by fuzzie and WebOS
+static const uint32 kDelayKeyboardEventMillis = 250;
+static const uint32 kDelayMouseEventMillis = 50;
+
 void Keymapper::Domain::addKeymap(Keymap *map) {
 	iterator it = find(map->getName());
 
@@ -281,9 +286,9 @@ Action *Keymapper::getAction(const KeyState& key) {
 List<Event> Keymapper::executeAction(const Action *action, IncomingEventType incomingType) {
 	List<Event> mappedEvents;
 	List<Event>::const_iterator it;
-
+	Event evt;
 	for (it = action->events.begin(); it != action->events.end(); ++it) {
-		Event evt = Event(*it);
+		evt = Event(*it);
 		EventType convertedType = convertDownToUp(evt.type);
 
 		// hardware keys need to send up instead when they are up
@@ -294,15 +299,23 @@ List<Event> Keymapper::executeAction(const Action *action, IncomingEventType inc
 		}
 
 		evt.mouse = _eventMan->getMousePos();
-		mappedEvents.push_back(evt);
+
+		// Check if the event is coming from a non-key hardware event
+		// that is mapped to a key event
+		if (incomingType == kIncomingNonKey && convertedType != EVENT_INVALID)
+			// WORKAROUND: Delay the down events coming from non-key hardware events
+			// with a zero delay. This is to prevent DOWN1 DOWN2 UP1 UP2.
+			addDelayedEvent(0, evt);
+		else
+			mappedEvents.push_back(evt);
 
 		// non-keys need to send up as well
-		// TODO: implement a way to add a delay
-		if (incomingType == kIncomingNonKey) {
-			if (convertedType == EVENT_INVALID)
-				continue; // don't send any non-down-converted events on up they were already sent on down
+		if (incomingType == kIncomingNonKey && convertedType != EVENT_INVALID) {
+			// WORKAROUND: Delay the up events coming from non-key hardware events
+			// This is for engines that run scripts that check on key being down
 			evt.type = convertedType;
-			mappedEvents.push_back(evt);
+			const uint32 delay = (convertedType == EVENT_KEYUP ? kDelayKeyboardEventMillis : kDelayMouseEventMillis);
+			addDelayedEvent(delay, evt);
 		}
 	}
 	return mappedEvents;
diff --git a/common/EventDispatcher.cpp b/common/EventDispatcher.cpp
index 4c7286bbb5..012a2dfce5 100644
--- a/common/EventDispatcher.cpp
+++ b/common/EventDispatcher.cpp
@@ -60,6 +60,12 @@ void EventDispatcher::dispatch() {
 			}
 		}
 	}
+
+	List<Event> delayedEvents = _mapper->getDelayedEvents();
+	for (List<Event>::iterator k = delayedEvents.begin(); k != delayedEvents.end(); ++k) {
+		const Event delayedEvent = *k;
+		dispatchEvent(delayedEvent);
+	}
 }
 
 void EventDispatcher::registerMapper(EventMapper *mapper) {
diff --git a/common/EventMapper.cpp b/common/EventMapper.cpp
index 0771ecdd89..47db61e472 100644
--- a/common/EventMapper.cpp
+++ b/common/EventMapper.cpp
@@ -21,6 +21,8 @@
  */
 
 #include "common/events.h"
+
+#include "common/system.h"
 #include "common/textconsole.h"
 
 namespace Common {
@@ -61,4 +63,30 @@ List<Event> DefaultEventMapper::mapEvent(const Event &ev, EventSource *source) {
 }
 
 
+void DefaultEventMapper::addDelayedEvent(uint32 millis, Event ev) {
+	if (_delayedEvents.empty()) {
+		_delayedEffectiveTime = g_system->getMillis() + millis;
+		millis = 0;
+	}
+	DelayedEventsEntry entry = DelayedEventsEntry(millis, ev);
+	_delayedEvents.push(entry);
+}
+
+List<Event> DefaultEventMapper::getDelayedEvents() {
+	List<Event> events;
+
+	if (_delayedEvents.empty())
+		return events;
+
+	uint32 now = g_system->getMillis();
+
+	while (!_delayedEvents.empty() && now >= _delayedEffectiveTime) {
+		DelayedEventsEntry entry = _delayedEvents.pop();
+		if (!_delayedEvents.empty())
+			_delayedEffectiveTime += _delayedEvents.front().timerOffset;
+		events.push_back(entry.event);
+	}
+	return events;
+}
+
 } // namespace Common
diff --git a/common/events.h b/common/events.h
index 7e411ecce5..7366c51d36 100644
--- a/common/events.h
+++ b/common/events.h
@@ -232,12 +232,27 @@ public:
 	 * Map an incoming event to one or more action events
 	 */
 	virtual List<Event> mapEvent(const Event &ev, EventSource *source) = 0;
+
+	virtual List<Event> getDelayedEvents() = 0;
 };
 
 class DefaultEventMapper : public EventMapper {
 public:
+	DefaultEventMapper() : _delayedEvents(), _delayedEffectiveTime(0) {}
 	// EventMapper interface
 	virtual List<Event> mapEvent(const Event &ev, EventSource *source);
+	virtual List<Event> getDelayedEvents();
+protected:
+	virtual void addDelayedEvent(uint32 millis, Event ev);
+
+	struct DelayedEventsEntry {
+		const uint32 timerOffset;
+		const Event event;
+		DelayedEventsEntry(const uint32 offset, const Event ev) : timerOffset(offset), event(ev) { }
+	};
+
+	Queue<DelayedEventsEntry> _delayedEvents;
+	uint32 _delayedEffectiveTime;
 };
 
 /**
-- 
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