From 120a4594855951ed5eb185fdfc19bf98efef3ba2 Mon Sep 17 00:00:00 2001
From: Jeff Brown <jeffbrown@google.com>
Date: Wed, 27 Oct 2010 18:43:51 -0700
Subject: Drop all dispatcher state when dispatcher is disabled.

This patch makes the dispatcher drop all of its state when it is
disabled (when the screen turns off).  This ensures that the dispatcher
does not get stuck thinking a pointer is still down if the screen
turned off while the user was touching the display (such as a fat touch
while hitting the power button).

Bug: 3098344
Change-Id: If50ef5804870aa1acd3179fd4b40e3cda58dd39d
---
 libs/ui/InputDispatcher.cpp | 24 +++++++++++++++++++++++-
 1 file changed, 23 insertions(+), 1 deletion(-)

(limited to 'libs/ui/InputDispatcher.cpp')

diff --git a/libs/ui/InputDispatcher.cpp b/libs/ui/InputDispatcher.cpp
index fef814818313..ae81d2615e49 100644
--- a/libs/ui/InputDispatcher.cpp
+++ b/libs/ui/InputDispatcher.cpp
@@ -1302,6 +1302,9 @@ Failed:
     }
 
 Unresponsive:
+    // Reset temporary touch state to ensure we release unnecessary references to input channels.
+    mTempTouchState.reset();
+
     nsecs_t timeSpentWaitingForApplication = getTimeSpentWaitingForApplicationLocked(currentTime);
     updateDispatchStatisticsLocked(currentTime, entry,
             injectionResult, timeSpentWaitingForApplication);
@@ -2586,10 +2589,14 @@ void InputDispatcher::setInputDispatchMode(bool enabled, bool frozen) {
         AutoMutex _l(mLock);
 
         if (mDispatchEnabled != enabled || mDispatchFrozen != frozen) {
-            if (mDispatchFrozen && ! frozen) {
+            if (mDispatchFrozen && !frozen) {
                 resetANRTimeoutsLocked();
             }
 
+            if (mDispatchEnabled && !enabled) {
+                resetAndDropEverythingLocked("dispatcher is being disabled");
+            }
+
             mDispatchEnabled = enabled;
             mDispatchFrozen = frozen;
             changed = true;
@@ -2608,6 +2615,21 @@ void InputDispatcher::setInputDispatchMode(bool enabled, bool frozen) {
     }
 }
 
+void InputDispatcher::resetAndDropEverythingLocked(const char* reason) {
+#if DEBUG_FOCUS
+    LOGD("Resetting and dropping all events (%s).", reason);
+#endif
+
+    synthesizeCancelationEventsForAllConnectionsLocked(InputState::CANCEL_ALL_EVENTS, reason);
+
+    resetKeyRepeatLocked();
+    releasePendingEventLocked();
+    drainInboundQueueLocked();
+    resetTargetsLocked();
+
+    mTouchState.reset();
+}
+
 void InputDispatcher::logDispatchStateLocked() {
     String8 dump;
     dumpDispatchStateLocked(dump);
-- 
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