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<dt>Revision</dt> <dd><a href="http://trac.webkit.org/projects/webkit/changeset/181300">181300</a></dd>
<dt>Author</dt> <dd>bfulgham@apple.com</dd>
<dt>Date</dt> <dd>2015-03-09 18:00:15 -0700 (Mon, 09 Mar 2015)</dd>
</dl>
<h3>Log Message</h3>
<pre>Assertion in ScrollController::processWheelEventForScrollSnapOnAxis when scrolling with mechanical wheel mouse
https://bugs.webkit.org/show_bug.cgi?id=142517
Reviewed by Simon Fraser.
* platform/cocoa/ScrollController.mm:
(WebCore::toWheelEventStatus): Recognize stateless mechanical wheel events.
(WebCore::ScrollController::processWheelEventForScrollSnapOnAxis): If a mechanical wheel event is processed while
considering scroll snap logic, end any snap animations and clean up.
(WebCore::ScrollController::updateScrollSnapPoints): Don't begin tracking scroll snap state if there is not
scroll snap point defined in the markup.</pre>
<h3>Modified Paths</h3>
<ul>
<li><a href="#trunkSourceWebCoreChangeLog">trunk/Source/WebCore/ChangeLog</a></li>
<li><a href="#trunkSourceWebCoreplatformcocoaScrollControllermm">trunk/Source/WebCore/platform/cocoa/ScrollController.mm</a></li>
</ul>
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<div id="patch">
<h3>Diff</h3>
<a id="trunkSourceWebCoreChangeLog"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/ChangeLog (181299 => 181300)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/ChangeLog 2015-03-10 00:34:55 UTC (rev 181299)
+++ trunk/Source/WebCore/ChangeLog 2015-03-10 01:00:15 UTC (rev 181300)
</span><span class="lines">@@ -1,3 +1,17 @@
</span><ins>+2015-03-09 Brent Fulgham <bfulgham@apple.com>
+
+ Assertion in ScrollController::processWheelEventForScrollSnapOnAxis when scrolling with mechanical wheel mouse
+ https://bugs.webkit.org/show_bug.cgi?id=142517
+
+ Reviewed by Simon Fraser.
+
+ * platform/cocoa/ScrollController.mm:
+ (WebCore::toWheelEventStatus): Recognize stateless mechanical wheel events.
+ (WebCore::ScrollController::processWheelEventForScrollSnapOnAxis): If a mechanical wheel event is processed while
+ considering scroll snap logic, end any snap animations and clean up.
+ (WebCore::ScrollController::updateScrollSnapPoints): Don't begin tracking scroll snap state if there is not
+ scroll snap point defined in the markup.
+
</ins><span class="cx"> 2015-03-09 Myles C. Maxfield <mmaxfield@apple.com>
</span><span class="cx">
</span><span class="cx"> REGRESSION(r176978): Inline-blocks with overflowing contents have ascents that are too large
</span></span></pre></div>
<a id="trunkSourceWebCoreplatformcocoaScrollControllermm"></a>
<div class="modfile"><h4>Modified: trunk/Source/WebCore/platform/cocoa/ScrollController.mm (181299 => 181300)</h4>
<pre class="diff"><span>
<span class="info">--- trunk/Source/WebCore/platform/cocoa/ScrollController.mm 2015-03-10 00:34:55 UTC (rev 181299)
+++ trunk/Source/WebCore/platform/cocoa/ScrollController.mm 2015-03-10 01:00:15 UTC (rev 181300)
</span><span class="lines">@@ -90,6 +90,7 @@
</span><span class="cx"> InertialScrollBegin,
</span><span class="cx"> InertialScrolling,
</span><span class="cx"> InertialScrollEnd,
</span><ins>+ StatelessScrollEvent,
</ins><span class="cx"> Unknown
</span><span class="cx"> };
</span><span class="cx">
</span><span class="lines">@@ -476,7 +477,10 @@
</span><span class="cx">
</span><span class="cx"> case PlatformWheelEventPhaseEnded:
</span><span class="cx"> return WheelEventStatus::InertialScrollEnd;
</span><del>-
</del><ins>+
+ case PlatformWheelEventPhaseNone:
+ return WheelEventStatus::StatelessScrollEvent;
+
</ins><span class="cx"> default:
</span><span class="cx"> return WheelEventStatus::Unknown;
</span><span class="cx"> }
</span><span class="lines">@@ -540,7 +544,13 @@
</span><span class="cx"> snapState.clearInitialWheelDeltaWindow();
</span><span class="cx"> snapState.m_shouldOverrideWheelEvent = false;
</span><span class="cx"> break;
</span><del>-
</del><ins>+
+ case WheelEventStatus::StatelessScrollEvent:
+ endScrollSnapAnimation(axis, ScrollSnapState::UserInteraction);
+ snapState.clearInitialWheelDeltaWindow();
+ snapState.m_shouldOverrideWheelEvent = false;
+ break;
+
</ins><span class="cx"> case WheelEventStatus::Unknown:
</span><span class="cx"> ASSERT_NOT_REACHED();
</span><span class="cx"> break;
</span><span class="lines">@@ -588,10 +598,10 @@
</span><span class="cx"> {
</span><span class="cx"> // FIXME: Currently, scroll snap animators are recreated even though the snap offsets alone can be updated.
</span><span class="cx"> if (axis == ScrollEventAxis::Horizontal)
</span><del>- m_horizontalScrollSnapState = std::make_unique<ScrollSnapAnimatorState>(ScrollEventAxis::Horizontal, snapPoints);
</del><ins>+ m_horizontalScrollSnapState = !snapPoints.isEmpty() ? std::make_unique<ScrollSnapAnimatorState>(ScrollEventAxis::Horizontal, snapPoints) : nullptr;
</ins><span class="cx">
</span><span class="cx"> if (axis == ScrollEventAxis::Vertical)
</span><del>- m_verticalScrollSnapState = std::make_unique<ScrollSnapAnimatorState>(ScrollEventAxis::Vertical, snapPoints);
</del><ins>+ m_verticalScrollSnapState = !snapPoints.isEmpty() ? std::make_unique<ScrollSnapAnimatorState>(ScrollEventAxis::Vertical, snapPoints) : nullptr;
</ins><span class="cx"> }
</span><span class="cx">
</span><span class="cx"> void ScrollController::startScrollSnapTimer(ScrollEventAxis axis)
</span></span></pre>
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