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-rw-r--r--layout/generic/ScrollPositionUpdate.cpp156
1 files changed, 156 insertions, 0 deletions
diff --git a/layout/generic/ScrollPositionUpdate.cpp b/layout/generic/ScrollPositionUpdate.cpp
new file mode 100644
index 0000000000..9607d2d18a
--- /dev/null
+++ b/layout/generic/ScrollPositionUpdate.cpp
@@ -0,0 +1,156 @@
+/* This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
+
+#include "ScrollPositionUpdate.h"
+
+#include <ostream>
+
+#include "mozilla/Assertions.h"
+
+namespace mozilla {
+
+static ScrollGenerationCounter sGenerationCounter;
+
+ScrollPositionUpdate::ScrollPositionUpdate()
+ : mType(ScrollUpdateType::Absolute),
+ mScrollMode(ScrollMode::Normal),
+ mScrollOrigin(ScrollOrigin::None),
+ mTriggeredByScript(ScrollTriggeredByScript::No) {}
+
+/*static*/
+ScrollPositionUpdate ScrollPositionUpdate::NewScrollframe(
+ nsPoint aInitialPosition) {
+ ScrollPositionUpdate ret;
+ ret.mScrollGeneration = sGenerationCounter.NewMainThreadGeneration();
+ ret.mScrollMode = ScrollMode::Instant;
+ ret.mDestination = CSSPoint::FromAppUnits(aInitialPosition);
+ return ret;
+}
+
+/*static*/
+ScrollPositionUpdate ScrollPositionUpdate::NewScroll(ScrollOrigin aOrigin,
+ nsPoint aDestination) {
+ MOZ_ASSERT(aOrigin != ScrollOrigin::NotSpecified);
+ MOZ_ASSERT(aOrigin != ScrollOrigin::None);
+
+ ScrollPositionUpdate ret;
+ ret.mScrollGeneration = sGenerationCounter.NewMainThreadGeneration();
+ ret.mType = ScrollUpdateType::Absolute;
+ ret.mScrollMode = ScrollMode::Instant;
+ ret.mScrollOrigin = aOrigin;
+ ret.mDestination = CSSPoint::FromAppUnits(aDestination);
+ return ret;
+}
+
+/*static*/
+ScrollPositionUpdate ScrollPositionUpdate::NewRelativeScroll(
+ nsPoint aSource, nsPoint aDestination) {
+ ScrollPositionUpdate ret;
+ ret.mScrollGeneration = sGenerationCounter.NewMainThreadGeneration();
+ ret.mType = ScrollUpdateType::Relative;
+ ret.mScrollMode = ScrollMode::Instant;
+ ret.mScrollOrigin = ScrollOrigin::Relative;
+ ret.mDestination = CSSPoint::FromAppUnits(aDestination);
+ ret.mSource = CSSPoint::FromAppUnits(aSource);
+ return ret;
+}
+
+/*static*/
+ScrollPositionUpdate ScrollPositionUpdate::NewSmoothScroll(
+ ScrollMode aMode, ScrollOrigin aOrigin, nsPoint aDestination,
+ ScrollTriggeredByScript aTriggeredByScript,
+ UniquePtr<ScrollSnapTargetIds> aSnapTargetIds) {
+ MOZ_ASSERT(aOrigin != ScrollOrigin::NotSpecified);
+ MOZ_ASSERT(aOrigin != ScrollOrigin::None);
+ MOZ_ASSERT(aMode == ScrollMode::Smooth || aMode == ScrollMode::SmoothMsd);
+
+ ScrollPositionUpdate ret;
+ ret.mScrollGeneration = sGenerationCounter.NewMainThreadGeneration();
+ ret.mType = ScrollUpdateType::Absolute;
+ ret.mScrollMode = aMode;
+ ret.mScrollOrigin = aOrigin;
+ ret.mDestination = CSSPoint::FromAppUnits(aDestination);
+ ret.mTriggeredByScript = aTriggeredByScript;
+ if (aSnapTargetIds) {
+ ret.mSnapTargetIds = *aSnapTargetIds;
+ }
+ return ret;
+}
+
+/*static*/
+ScrollPositionUpdate ScrollPositionUpdate::NewPureRelativeScroll(
+ ScrollOrigin aOrigin, ScrollMode aMode, const nsPoint& aDelta) {
+ MOZ_ASSERT(aOrigin != ScrollOrigin::NotSpecified);
+ MOZ_ASSERT(aOrigin != ScrollOrigin::None);
+
+ ScrollPositionUpdate ret;
+ ret.mScrollGeneration = sGenerationCounter.NewMainThreadGeneration();
+ ret.mType = ScrollUpdateType::PureRelative;
+ ret.mScrollMode = aMode;
+ ret.mScrollOrigin = aOrigin;
+ ret.mDelta = CSSPoint::FromAppUnits(aDelta);
+ return ret;
+}
+
+/*static*/
+ScrollPositionUpdate ScrollPositionUpdate::NewMergeableScroll(
+ ScrollOrigin aOrigin, nsPoint aDestination) {
+ MOZ_ASSERT(aOrigin == ScrollOrigin::AnchorAdjustment);
+
+ ScrollPositionUpdate ret;
+ ret.mScrollGeneration = sGenerationCounter.NewMainThreadGeneration();
+ ret.mType = ScrollUpdateType::MergeableAbsolute;
+ ret.mScrollMode = ScrollMode::Instant;
+ ret.mScrollOrigin = aOrigin;
+ ret.mDestination = CSSPoint::FromAppUnits(aDestination);
+ return ret;
+}
+
+bool ScrollPositionUpdate::operator==(
+ const ScrollPositionUpdate& aOther) const {
+ // instances are immutable, and all the fields are set when the generation
+ // is set. So if the generation matches, these instances are identical.
+ return mScrollGeneration == aOther.mScrollGeneration;
+}
+
+MainThreadScrollGeneration ScrollPositionUpdate::GetGeneration() const {
+ return mScrollGeneration;
+}
+
+ScrollUpdateType ScrollPositionUpdate::GetType() const { return mType; }
+
+ScrollMode ScrollPositionUpdate::GetMode() const { return mScrollMode; }
+
+ScrollOrigin ScrollPositionUpdate::GetOrigin() const { return mScrollOrigin; }
+
+CSSPoint ScrollPositionUpdate::GetDestination() const {
+ MOZ_ASSERT(mType == ScrollUpdateType::Absolute ||
+ mType == ScrollUpdateType::MergeableAbsolute ||
+ mType == ScrollUpdateType::Relative);
+ return mDestination;
+}
+
+CSSPoint ScrollPositionUpdate::GetSource() const {
+ MOZ_ASSERT(mType == ScrollUpdateType::Relative);
+ return mSource;
+}
+
+CSSPoint ScrollPositionUpdate::GetDelta() const {
+ MOZ_ASSERT(mType == ScrollUpdateType::PureRelative);
+ return mDelta;
+}
+
+std::ostream& operator<<(std::ostream& aStream,
+ const ScrollPositionUpdate& aUpdate) {
+ aStream << "{ gen=" << aUpdate.mScrollGeneration
+ << ", type=" << (int)aUpdate.mType
+ << ", mode=" << (int)aUpdate.mScrollMode
+ << ", origin=" << (int)aUpdate.mScrollOrigin
+ << ", dst=" << aUpdate.mDestination << ", src=" << aUpdate.mSource
+ << ", delta=" << aUpdate.mDelta
+ << ", triggered by script=" << aUpdate.WasTriggeredByScript() << " }";
+ return aStream;
+}
+
+} // namespace mozilla