1 files changed, 133 insertions, 0 deletions
diff --git a/Source/WebCore/page/WheelEventTestTrigger.cpp b/Source/WebCore/page/WheelEventTestTrigger.cpp
new file mode 100644
index 000000000..39887f135
--- /dev/null
+++ b/Source/WebCore/page/WheelEventTestTrigger.cpp
@@ -0,0 +1,133 @@
+/*
+ * Copyright (C) 2015 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
+ *     documentation and/or other materials provided with the distribution.
+ * 3.  Neither the name of Apple Inc. ("Apple") nor the names of
+ *     its contributors may be used to endorse or promote products derived
+ *     from this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY APPLE AND ITS CONTRIBUTORS "AS IS" AND ANY
+ * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
+ * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
+ * DISCLAIMED. IN NO EVENT SHALL APPLE OR ITS CONTRIBUTORS BE LIABLE FOR ANY
+ * DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
+ * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
+ * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
+ * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
+ * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#include "config.h"
+#include "WheelEventTestTrigger.h"
+
+#include "Logging.h"
+
+#if !LOG_DISABLED
+#include <wtf/text/CString.h>
+#include <wtf/text/StringBuilder.h>
+#endif
+
+namespace WebCore {
+
+WheelEventTestTrigger::WheelEventTestTrigger()
+    : m_testTriggerTimer(RunLoop::current(), this, &WheelEventTestTrigger::triggerTestTimerFired)
+{
+}
+
+void WheelEventTestTrigger::clearAllTestDeferrals()
+{
+    std::lock_guard<Lock> lock(m_testTriggerMutex);
+    m_deferTestTriggerReasons.clear();
+    m_testNotificationCallback = std::function<void()>();
+    m_testTriggerTimer.stop();
+    LOG(WheelEventTestTriggers, "      (=) WheelEventTestTrigger::clearAllTestDeferrals: cleared all test state.");
+}
+
+void WheelEventTestTrigger::setTestCallbackAndStartNotificationTimer(std::function<void()> functionCallback)
+{
+    {
+        std::lock_guard<Lock> lock(m_testTriggerMutex);
+        m_testNotificationCallback = WTFMove(functionCallback);
+    }
+    
+    if (!m_testTriggerTimer.isActive())
+        m_testTriggerTimer.startRepeating(1.0 / 60.0);
+}
+
+void WheelEventTestTrigger::deferTestsForReason(ScrollableAreaIdentifier identifier, DeferTestTriggerReason reason)
+{
+    std::lock_guard<Lock> lock(m_testTriggerMutex);
+    auto it = m_deferTestTriggerReasons.find(identifier);
+    if (it == m_deferTestTriggerReasons.end())
+        it = m_deferTestTriggerReasons.add(identifier, std::set<DeferTestTriggerReason>()).iterator;
+    
+    LOG(WheelEventTestTriggers, "      (=) WheelEventTestTrigger::deferTestsForReason: id=%p, reason=%d", identifier, reason);
+    it->value.insert(reason);
+}
+
+void WheelEventTestTrigger::removeTestDeferralForReason(ScrollableAreaIdentifier identifier, DeferTestTriggerReason reason)
+{
+    std::lock_guard<Lock> lock(m_testTriggerMutex);
+    auto it = m_deferTestTriggerReasons.find(identifier);
+    if (it == m_deferTestTriggerReasons.end())
+        return;
+
+    LOG(WheelEventTestTriggers, "      (=) WheelEventTestTrigger::removeTestDeferralForReason: id=%p, reason=%d", identifier, reason);
+    it->value.erase(reason);
+    
+    if (it->value.empty())
+        m_deferTestTriggerReasons.remove(it);
+}
+
+#if !LOG_DISABLED
+static void dumpState(WTF::HashMap<WheelEventTestTrigger::ScrollableAreaIdentifier, std::set<WheelEventTestTrigger::DeferTestTriggerReason>> reasons)
+{
+    LOG(WheelEventTestTriggers, "   WheelEventTestTrigger::dumpState:");
+    for (const auto& scrollRegion : reasons) {
+        LOG(WheelEventTestTriggers, "   For scroll region %p", scrollRegion.key);
+        StringBuilder reasons;
+        for (const auto& reason : scrollRegion.value) {
+            if (!reasons.isEmpty())
+                reasons.append(", ");
+            reasons.append(String::number(reason));
+        }
+        LOG(WheelEventTestTriggers, "     Reasons: %s", reasons.toString().utf8().data());
+    }
+}
+#endif
+    
+void WheelEventTestTrigger::triggerTestTimerFired()
+{
+    std::function<void()> functionCallback;
+
+    {
+        std::lock_guard<Lock> lock(m_testTriggerMutex);
+        if (!m_deferTestTriggerReasons.isEmpty()) {
+#if !LOG_DISABLED
+            if (isLogChannelEnabled("WheelEventTestTriggers"))
+                dumpState(m_deferTestTriggerReasons);
+#endif
+            return;
+        }
+
+        functionCallback = WTFMove(m_testNotificationCallback);
+        m_testNotificationCallback = std::function<void()>();
+    }
+
+    m_testTriggerTimer.stop();
+
+    LOG(WheelEventTestTriggers, "  WheelEventTestTrigger::triggerTestTimerFired: FIRING TEST");
+    if (functionCallback)
+        functionCallback();
+}
+
+}