Adding handlers for user gesture callbacks.

Source/platform/UserGestureIndicator.cpp

 /*
  * Copyright (C) 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 11 matching lines @@
  * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF
  * THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "platform/UserGestureIndicator.h"
 
 #include "wtf/Assertions.h"
 #include "wtf/CurrentTime.h"
 #include "wtf/MainThread.h"
+#include "wtf/Vector.h"
 
 namespace WebCore {
 
 namespace {
 
 // User gestures timeout in 1 second.
 const double userGestureTimeout = 1.0;
 
 // For out of process tokens we allow a 10 second delay.
 const double userGestureOutOfProcessTimeout = 10.0;
@@ skipping 63 matching lines @@
 
 }
 
 static bool isDefinite(ProcessingUserGestureState state)
 {
     return state == DefinitelyProcessingNewUserGesture || state == DefinitelyProcessingUserGesture || state == DefinitelyNotProcessingUserGesture;
 }
 
 ProcessingUserGestureState UserGestureIndicator::s_state = DefinitelyNotProcessingUserGesture;
 UserGestureIndicator* UserGestureIndicator::s_topmostIndicator = 0;
+UserGestureHandler* UserGestureIndicator::s_handler = 0;
 
 UserGestureIndicator::UserGestureIndicator(ProcessingUserGestureState state)
     : m_previousState(s_state)
 {
     // Silently ignore UserGestureIndicators on non-main threads.
     if (!isMainThread())
         return;
 
     // We overwrite s_state only if the caller is definite about the gesture state.
     if (isDefinite(state)) {
         if (!s_topmostIndicator) {
             s_topmostIndicator = this;
             m_token = GestureToken::create();
         } else {
             m_token = s_topmostIndicator->currentToken();
         }
         s_state = state;
     }
 
-    if (state == DefinitelyProcessingNewUserGesture)
+    bool onGesture = false;

[abarth-chromium, 2013/11/26 19:36:37]

Can we name this something that sounds like a boolean?  Maybe
shouldNotifyHandler?

[jww, 2013/11/26 20:11:55]

Done.

+    if (state == DefinitelyProcessingNewUserGesture) {
         static_cast<GestureToken*>(m_token.get())->addGesture();
-    else if (state == DefinitelyProcessingUserGesture && s_topmostIndicator == this)
+        onGesture = true;
+    } else if (state == DefinitelyProcessingUserGesture && s_topmostIndicator == this) {
         static_cast<GestureToken*>(m_token.get())->addGesture();
+        onGesture = true;
+    }
+
+    if (onGesture && s_handler)
+        s_handler->onGesture();
     ASSERT(isDefinite(s_state));
 }
 
 UserGestureIndicator::UserGestureIndicator(PassRefPtr<UserGestureToken> token)
     : m_previousState(s_state)
 {
     // Silently ignore UserGestureIndicators on non-main threads.
     if (!isMainThread())
         return;
 
     if (token) {
         static_cast<GestureToken*>(token.get())->resetTimestamp();
         if (!s_topmostIndicator) {
             s_topmostIndicator = this;
             m_token = token;
         } else {
             m_token = s_topmostIndicator->currentToken();
             if (static_cast<GestureToken*>(token.get())->hasGestures()) {
                 static_cast<GestureToken*>(m_token.get())->addGesture();
                 static_cast<GestureToken*>(token.get())->consumeGesture();
             }
         }
         s_state = DefinitelyProcessingUserGesture;
+
+        if (s_handler)
+            s_handler->onGesture();
     }
 
     ASSERT(isDefinite(s_state));
 }
 
 UserGestureIndicator::~UserGestureIndicator()
 {
     if (!isMainThread())
         return;
     s_state = m_previousState;
@@ skipping 16 matching lines @@
     return static_cast<GestureToken*>(s_topmostIndicator->currentToken())->consumeGesture();
 }
 
 UserGestureToken* UserGestureIndicator::currentToken()
 {
     if (!isMainThread() || !s_topmostIndicator)
         return 0;
     return s_topmostIndicator->m_token.get();
 }
 
+void UserGestureIndicator::setHandler(UserGestureHandler* handler)
+{
+    s_handler = handler;
+}
+
 UserGestureIndicatorDisabler::UserGestureIndicatorDisabler()
     : m_savedState(UserGestureIndicator::s_state)
     , m_savedIndicator(UserGestureIndicator::s_topmostIndicator)
 {
     RELEASE_ASSERT(isMainThread());
     UserGestureIndicator::s_state = DefinitelyNotProcessingUserGesture;
     UserGestureIndicator::s_topmostIndicator = 0;
 }
 
 UserGestureIndicatorDisabler::~UserGestureIndicatorDisabler()
 {
     RELEASE_ASSERT(isMainThread());
     UserGestureIndicator::s_state = m_savedState;
     UserGestureIndicator::s_topmostIndicator = m_savedIndicator;
 }
 
 }