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Diffstat (limited to 'layout/xul/nsSplitterFrame.cpp')
| -rw-r--r-- | layout/xul/nsSplitterFrame.cpp | 964 |
1 files changed, 964 insertions, 0 deletions
diff --git a/layout/xul/nsSplitterFrame.cpp b/layout/xul/nsSplitterFrame.cpp new file mode 100644 index 0000000000..89d3ac1c25 --- /dev/null +++ b/layout/xul/nsSplitterFrame.cpp @@ -0,0 +1,964 @@ +/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ +/* vim: set ts=8 sts=2 et sw=2 tw=80: */ +/* 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/. */ + +// +// Eric Vaughan +// Netscape Communications +// +// See documentation in associated header file +// + +#include "LayoutConstants.h" +#include "SimpleXULLeafFrame.h" +#include "gfxContext.h" +#include "mozilla/ReflowInput.h" +#include "nsSplitterFrame.h" +#include "nsGkAtoms.h" +#include "nsXULElement.h" +#include "nsPresContext.h" +#include "mozilla/dom/Document.h" +#include "nsNameSpaceManager.h" +#include "nsScrollbarButtonFrame.h" +#include "nsIDOMEventListener.h" +#include "nsICSSDeclaration.h" +#include "nsFrameList.h" +#include "nsHTMLParts.h" +#include "mozilla/ComputedStyle.h" +#include "mozilla/CSSOrderAwareFrameIterator.h" +#include "nsContainerFrame.h" +#include "nsContentCID.h" +#include "nsLayoutUtils.h" +#include "nsDisplayList.h" +#include "nsContentUtils.h" +#include "nsFlexContainerFrame.h" +#include "mozilla/dom/Element.h" +#include "mozilla/dom/Event.h" +#include "mozilla/dom/MouseEvent.h" +#include "mozilla/MouseEvents.h" +#include "mozilla/PresShell.h" +#include "mozilla/UniquePtr.h" +#include "nsStyledElement.h" + +using namespace mozilla; + +using mozilla::dom::Element; +using mozilla::dom::Event; + +class nsSplitterInfo { + public: + nscoord min; + nscoord max; + nscoord current; + nscoord pref; + nscoord changed; + nsCOMPtr<nsIContent> childElem; +}; + +enum class ResizeType { + // Resize the closest sibling in a given direction. + Closest, + // Resize the farthest sibling in a given direction. + Farthest, + // Resize only flexible siblings in a given direction. + Flex, + // No space should be taken out of any children in that direction. + // FIXME(emilio): This is a rather odd name... + Grow, + // Only resize adjacent siblings. + Sibling, + // Don't resize anything in a given direction. + None, +}; +static ResizeType ResizeTypeFromAttribute(const Element& aElement, + nsAtom* aAttribute) { + static Element::AttrValuesArray strings[] = { + nsGkAtoms::farthest, nsGkAtoms::flex, nsGkAtoms::grow, + nsGkAtoms::sibling, nsGkAtoms::none, nullptr}; + switch (aElement.FindAttrValueIn(kNameSpaceID_None, aAttribute, strings, + eCaseMatters)) { + case 0: + return ResizeType::Farthest; + case 1: + return ResizeType::Flex; + case 2: + // Grow only applies to resizeAfter. + if (aAttribute == nsGkAtoms::resizeafter) { + return ResizeType::Grow; + } + break; + case 3: + return ResizeType::Sibling; + case 4: + return ResizeType::None; + default: + break; + } + return ResizeType::Closest; +} + +class nsSplitterFrameInner final : public nsIDOMEventListener { + protected: + virtual ~nsSplitterFrameInner(); + + public: + NS_DECL_ISUPPORTS + NS_DECL_NSIDOMEVENTLISTENER + + explicit nsSplitterFrameInner(nsSplitterFrame* aSplitter) + : mOuter(aSplitter) {} + + void Disconnect() { mOuter = nullptr; } + + nsresult MouseDown(Event* aMouseEvent); + nsresult MouseUp(Event* aMouseEvent); + nsresult MouseMove(Event* aMouseEvent); + + void MouseDrag(nsPresContext* aPresContext, WidgetGUIEvent* aEvent); + void MouseUp(nsPresContext* aPresContext, WidgetGUIEvent* aEvent); + + void AdjustChildren(nsPresContext* aPresContext); + void AdjustChildren(nsPresContext* aPresContext, + nsTArray<nsSplitterInfo>& aChildInfos, + bool aIsHorizontal); + + void AddRemoveSpace(nscoord aDiff, nsTArray<nsSplitterInfo>& aChildInfos, + int32_t& aSpaceLeft); + + void ResizeChildTo(nscoord& aDiff); + + void UpdateState(); + + void AddListener(); + void RemoveListener(); + + enum class State { Open, CollapsedBefore, CollapsedAfter, Dragging }; + enum CollapseDirection { Before, After }; + + ResizeType GetResizeBefore(); + ResizeType GetResizeAfter(); + State GetState(); + + bool SupportsCollapseDirection(CollapseDirection aDirection); + + void EnsureOrient(); + void SetPreferredSize(nsIFrame* aChildBox, bool aIsHorizontal, nscoord aSize); + + nsSplitterFrame* mOuter; + bool mDidDrag = false; + nscoord mDragStart = 0; + nsIFrame* mParentBox = nullptr; + bool mPressed = false; + nsTArray<nsSplitterInfo> mChildInfosBefore; + nsTArray<nsSplitterInfo> mChildInfosAfter; + State mState = State::Open; + nscoord mSplitterPos = 0; + bool mDragging = false; + + const Element* SplitterElement() const { + return mOuter->GetContent()->AsElement(); + } +}; + +NS_IMPL_ISUPPORTS(nsSplitterFrameInner, nsIDOMEventListener) + +ResizeType nsSplitterFrameInner::GetResizeBefore() { + return ResizeTypeFromAttribute(*SplitterElement(), nsGkAtoms::resizebefore); +} + +ResizeType nsSplitterFrameInner::GetResizeAfter() { + return ResizeTypeFromAttribute(*SplitterElement(), nsGkAtoms::resizeafter); +} + +nsSplitterFrameInner::~nsSplitterFrameInner() = default; + +nsSplitterFrameInner::State nsSplitterFrameInner::GetState() { + static Element::AttrValuesArray strings[] = {nsGkAtoms::dragging, + nsGkAtoms::collapsed, nullptr}; + static Element::AttrValuesArray strings_substate[] = { + nsGkAtoms::before, nsGkAtoms::after, nullptr}; + switch (SplitterElement()->FindAttrValueIn( + kNameSpaceID_None, nsGkAtoms::state, strings, eCaseMatters)) { + case 0: + return State::Dragging; + case 1: + switch (SplitterElement()->FindAttrValueIn( + kNameSpaceID_None, nsGkAtoms::substate, strings_substate, + eCaseMatters)) { + case 0: + return State::CollapsedBefore; + case 1: + return State::CollapsedAfter; + default: + if (SupportsCollapseDirection(After)) { + return State::CollapsedAfter; + } + return State::CollapsedBefore; + } + } + return State::Open; +} + +// +// NS_NewSplitterFrame +// +// Creates a new Toolbar frame and returns it +// +nsIFrame* NS_NewSplitterFrame(PresShell* aPresShell, ComputedStyle* aStyle) { + return new (aPresShell) nsSplitterFrame(aStyle, aPresShell->GetPresContext()); +} + +NS_IMPL_FRAMEARENA_HELPERS(nsSplitterFrame) + +nsSplitterFrame::nsSplitterFrame(ComputedStyle* aStyle, + nsPresContext* aPresContext) + : SimpleXULLeafFrame(aStyle, aPresContext, kClassID) {} + +void nsSplitterFrame::Destroy(DestroyContext& aContext) { + if (mInner) { + mInner->RemoveListener(); + mInner->Disconnect(); + mInner = nullptr; + } + SimpleXULLeafFrame::Destroy(aContext); +} + +nsresult nsSplitterFrame::AttributeChanged(int32_t aNameSpaceID, + nsAtom* aAttribute, + int32_t aModType) { + nsresult rv = + SimpleXULLeafFrame::AttributeChanged(aNameSpaceID, aAttribute, aModType); + if (aAttribute == nsGkAtoms::state) { + mInner->UpdateState(); + } + + return rv; +} + +/** + * Initialize us. If we are in a box get our alignment so we know what direction + * we are + */ +void nsSplitterFrame::Init(nsIContent* aContent, nsContainerFrame* aParent, + nsIFrame* aPrevInFlow) { + MOZ_ASSERT(!mInner); + mInner = new nsSplitterFrameInner(this); + + SimpleXULLeafFrame::Init(aContent, aParent, aPrevInFlow); + + mInner->AddListener(); + mInner->mParentBox = nullptr; +} + +static bool IsValidParentBox(nsIFrame* aFrame) { + return aFrame->IsFlexContainerFrame(); +} + +static nsIFrame* GetValidParentBox(nsIFrame* aChild) { + return aChild->GetParent() && IsValidParentBox(aChild->GetParent()) + ? aChild->GetParent() + : nullptr; +} + +void nsSplitterFrame::Reflow(nsPresContext* aPresContext, + ReflowOutput& aDesiredSize, + const ReflowInput& aReflowInput, + nsReflowStatus& aStatus) { + if (HasAnyStateBits(NS_FRAME_FIRST_REFLOW)) { + mInner->mParentBox = GetValidParentBox(this); + mInner->UpdateState(); + } + return SimpleXULLeafFrame::Reflow(aPresContext, aDesiredSize, aReflowInput, + aStatus); +} + +static bool SplitterIsHorizontal(const nsIFrame* aParentBox) { + // If our parent is horizontal, the splitter is vertical and vice-versa. + MOZ_ASSERT(aParentBox->IsFlexContainerFrame()); + const FlexboxAxisInfo info(aParentBox); + return !info.mIsRowOriented; +} + +NS_IMETHODIMP +nsSplitterFrame::HandlePress(nsPresContext* aPresContext, + WidgetGUIEvent* aEvent, + nsEventStatus* aEventStatus) { + return NS_OK; +} + +NS_IMETHODIMP +nsSplitterFrame::HandleMultiplePress(nsPresContext* aPresContext, + WidgetGUIEvent* aEvent, + nsEventStatus* aEventStatus, + bool aControlHeld) { + return NS_OK; +} + +NS_IMETHODIMP +nsSplitterFrame::HandleDrag(nsPresContext* aPresContext, WidgetGUIEvent* aEvent, + nsEventStatus* aEventStatus) { + return NS_OK; +} + +NS_IMETHODIMP +nsSplitterFrame::HandleRelease(nsPresContext* aPresContext, + WidgetGUIEvent* aEvent, + nsEventStatus* aEventStatus) { + return NS_OK; +} + +void nsSplitterFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder, + const nsDisplayListSet& aLists) { + SimpleXULLeafFrame::BuildDisplayList(aBuilder, aLists); + + // if the mouse is captured always return us as the frame. + if (mInner->mDragging && aBuilder->IsForEventDelivery()) { + // XXX It's probably better not to check visibility here, right? + aLists.Outlines()->AppendNewToTop<nsDisplayEventReceiver>(aBuilder, this); + return; + } +} + +nsresult nsSplitterFrame::HandleEvent(nsPresContext* aPresContext, + WidgetGUIEvent* aEvent, + nsEventStatus* aEventStatus) { + NS_ENSURE_ARG_POINTER(aEventStatus); + if (nsEventStatus_eConsumeNoDefault == *aEventStatus) { + return NS_OK; + } + + AutoWeakFrame weakFrame(this); + RefPtr<nsSplitterFrameInner> inner(mInner); + switch (aEvent->mMessage) { + case eMouseMove: + inner->MouseDrag(aPresContext, aEvent); + break; + + case eMouseUp: + if (aEvent->AsMouseEvent()->mButton == MouseButton::ePrimary) { + inner->MouseUp(aPresContext, aEvent); + } + break; + + default: + break; + } + + NS_ENSURE_STATE(weakFrame.IsAlive()); + return SimpleXULLeafFrame::HandleEvent(aPresContext, aEvent, aEventStatus); +} + +void nsSplitterFrameInner::MouseUp(nsPresContext* aPresContext, + WidgetGUIEvent* aEvent) { + if (mDragging && mOuter) { + AdjustChildren(aPresContext); + AddListener(); + PresShell::ReleaseCapturingContent(); // XXXndeakin is this needed? + mDragging = false; + State newState = GetState(); + // if the state is dragging then make it Open. + if (newState == State::Dragging) { + mOuter->mContent->AsElement()->SetAttr(kNameSpaceID_None, + nsGkAtoms::state, u""_ns, true); + } + + mPressed = false; + + // if we dragged then fire a command event. + if (mDidDrag) { + RefPtr<nsXULElement> element = + nsXULElement::FromNode(mOuter->GetContent()); + element->DoCommand(); + } + + // printf("MouseUp\n"); + } + + mChildInfosBefore.Clear(); + mChildInfosAfter.Clear(); +} + +void nsSplitterFrameInner::MouseDrag(nsPresContext* aPresContext, + WidgetGUIEvent* aEvent) { + if (!mDragging || !mOuter) { + return; + } + + const bool isHorizontal = !mOuter->IsHorizontal(); + nsPoint pt = nsLayoutUtils::GetEventCoordinatesRelativeTo( + aEvent, RelativeTo{mParentBox}); + nscoord pos = isHorizontal ? pt.x : pt.y; + + // take our current position and subtract the start location, + // mDragStart is in parent-box relative coordinates already. + pos -= mDragStart; + + for (auto& info : mChildInfosBefore) { + info.changed = info.current; + } + + for (auto& info : mChildInfosAfter) { + info.changed = info.current; + } + nscoord oldPos = pos; + + ResizeChildTo(pos); + + State currentState = GetState(); + bool supportsBefore = SupportsCollapseDirection(Before); + bool supportsAfter = SupportsCollapseDirection(After); + + const bool isRTL = + mOuter->StyleVisibility()->mDirection == StyleDirection::Rtl; + bool pastEnd = oldPos > 0 && oldPos > pos; + bool pastBegin = oldPos < 0 && oldPos < pos; + if (isRTL) { + // Swap the boundary checks in RTL mode + std::swap(pastEnd, pastBegin); + } + const bool isCollapsedBefore = pastBegin && supportsBefore; + const bool isCollapsedAfter = pastEnd && supportsAfter; + + // if we are in a collapsed position + if (isCollapsedBefore || isCollapsedAfter) { + // and we are not collapsed then collapse + if (currentState == State::Dragging) { + if (pastEnd) { + // printf("Collapse right\n"); + if (supportsAfter) { + RefPtr<Element> outer = mOuter->mContent->AsElement(); + outer->SetAttr(kNameSpaceID_None, nsGkAtoms::substate, u"after"_ns, + true); + outer->SetAttr(kNameSpaceID_None, nsGkAtoms::state, u"collapsed"_ns, + true); + } + + } else if (pastBegin) { + // printf("Collapse left\n"); + if (supportsBefore) { + RefPtr<Element> outer = mOuter->mContent->AsElement(); + outer->SetAttr(kNameSpaceID_None, nsGkAtoms::substate, u"before"_ns, + true); + outer->SetAttr(kNameSpaceID_None, nsGkAtoms::state, u"collapsed"_ns, + true); + } + } + } + } else { + // if we are not in a collapsed position and we are not dragging make sure + // we are dragging. + if (currentState != State::Dragging) { + mOuter->mContent->AsElement()->SetAttr( + kNameSpaceID_None, nsGkAtoms::state, u"dragging"_ns, true); + } + AdjustChildren(aPresContext); + } + + mDidDrag = true; +} + +void nsSplitterFrameInner::AddListener() { + mOuter->GetContent()->AddEventListener(u"mouseup"_ns, this, false, false); + mOuter->GetContent()->AddEventListener(u"mousedown"_ns, this, false, false); + mOuter->GetContent()->AddEventListener(u"mousemove"_ns, this, false, false); + mOuter->GetContent()->AddEventListener(u"mouseout"_ns, this, false, false); +} + +void nsSplitterFrameInner::RemoveListener() { + NS_ENSURE_TRUE_VOID(mOuter); + mOuter->GetContent()->RemoveEventListener(u"mouseup"_ns, this, false); + mOuter->GetContent()->RemoveEventListener(u"mousedown"_ns, this, false); + mOuter->GetContent()->RemoveEventListener(u"mousemove"_ns, this, false); + mOuter->GetContent()->RemoveEventListener(u"mouseout"_ns, this, false); +} + +nsresult nsSplitterFrameInner::HandleEvent(dom::Event* aEvent) { + nsAutoString eventType; + aEvent->GetType(eventType); + if (eventType.EqualsLiteral("mouseup")) return MouseUp(aEvent); + if (eventType.EqualsLiteral("mousedown")) return MouseDown(aEvent); + if (eventType.EqualsLiteral("mousemove") || + eventType.EqualsLiteral("mouseout")) + return MouseMove(aEvent); + + MOZ_ASSERT_UNREACHABLE("Unexpected eventType"); + return NS_OK; +} + +nsresult nsSplitterFrameInner::MouseUp(Event* aMouseEvent) { + NS_ENSURE_TRUE(mOuter, NS_OK); + mPressed = false; + + PresShell::ReleaseCapturingContent(); + + return NS_OK; +} + +template <typename LengthLike> +static nscoord ToLengthWithFallback(const LengthLike& aLengthLike, + nscoord aFallback) { + if (aLengthLike.ConvertsToLength()) { + return aLengthLike.ToLength(); + } + return aFallback; +} + +template <typename LengthLike> +static nsSize ToLengthWithFallback(const LengthLike& aWidth, + const LengthLike& aHeight, + nscoord aFallback = 0) { + return {ToLengthWithFallback(aWidth, aFallback), + ToLengthWithFallback(aHeight, aFallback)}; +} + +static void ApplyMargin(nsSize& aSize, const nsMargin& aMargin) { + if (aSize.width != NS_UNCONSTRAINEDSIZE) { + aSize.width += aMargin.LeftRight(); + } + if (aSize.height != NS_UNCONSTRAINEDSIZE) { + aSize.height += aMargin.TopBottom(); + } +} + +nsresult nsSplitterFrameInner::MouseDown(Event* aMouseEvent) { + NS_ENSURE_TRUE(mOuter, NS_OK); + dom::MouseEvent* mouseEvent = aMouseEvent->AsMouseEvent(); + if (!mouseEvent) { + return NS_OK; + } + + // only if left button + if (mouseEvent->Button() != 0) { + return NS_OK; + } + + if (SplitterElement()->AttrValueIs(kNameSpaceID_None, nsGkAtoms::disabled, + nsGkAtoms::_true, eCaseMatters)) + return NS_OK; + + mParentBox = GetValidParentBox(mOuter); + if (!mParentBox) { + return NS_OK; + } + + // get our index + mDidDrag = false; + + EnsureOrient(); + const bool isHorizontal = !mOuter->IsHorizontal(); + + const nsIContent* outerContent = mOuter->GetContent(); + + const ResizeType resizeBefore = GetResizeBefore(); + const ResizeType resizeAfter = GetResizeAfter(); + const int32_t childCount = mParentBox->PrincipalChildList().GetLength(); + + mChildInfosBefore.Clear(); + mChildInfosAfter.Clear(); + int32_t count = 0; + + bool foundOuter = false; + CSSOrderAwareFrameIterator iter( + mParentBox, FrameChildListID::Principal, + CSSOrderAwareFrameIterator::ChildFilter::IncludeAll, + CSSOrderAwareFrameIterator::OrderState::Unknown, + CSSOrderAwareFrameIterator::OrderingProperty::Order); + for (; !iter.AtEnd(); iter.Next()) { + nsIFrame* childBox = iter.get(); + if (childBox == mOuter) { + foundOuter = true; + if (!count) { + // We're at the beginning, nothing to do. + return NS_OK; + } + if (count == childCount - 1 && resizeAfter != ResizeType::Grow) { + // If it's the last index then we need to allow for resizeafter="grow" + return NS_OK; + } + } + count++; + + nsIContent* content = childBox->GetContent(); + // XXX flex seems untested, as it uses mBoxFlex rather than actual flexbox + // flex. + const nscoord flex = childBox->StyleXUL()->mBoxFlex; + const bool isBefore = !foundOuter; + const bool isResizable = [&] { + if (auto* element = nsXULElement::FromNode(content)) { + if (element->NodeInfo()->NameAtom() == nsGkAtoms::splitter) { + // skip over any splitters + return false; + } + + // We need to check for hidden attribute too, since treecols with + // the hidden="true" attribute are not really hidden, just collapsed + if (element->GetXULBoolAttr(nsGkAtoms::fixed) || + element->GetXULBoolAttr(nsGkAtoms::hidden)) { + return false; + } + } + + // We need to check this here rather than in the switch before because we + // want `sibling` to work in the DOM order, not frame tree order. + if (resizeBefore == ResizeType::Sibling && + content->GetNextElementSibling() == outerContent) { + return true; + } + if (resizeAfter == ResizeType::Sibling && + content->GetPreviousElementSibling() == outerContent) { + return true; + } + + const ResizeType resizeType = isBefore ? resizeBefore : resizeAfter; + switch (resizeType) { + case ResizeType::Grow: + case ResizeType::None: + case ResizeType::Sibling: + return false; + case ResizeType::Flex: + return flex > 0; + case ResizeType::Closest: + case ResizeType::Farthest: + break; + } + return true; + }(); + + if (!isResizable) { + continue; + } + + nsSize curSize = childBox->GetSize(); + const auto& pos = *childBox->StylePosition(); + nsSize minSize = ToLengthWithFallback(pos.mMinWidth, pos.mMinHeight); + nsSize maxSize = ToLengthWithFallback(pos.mMaxWidth, pos.mMaxHeight, + NS_UNCONSTRAINEDSIZE); + nsSize prefSize(ToLengthWithFallback(pos.mWidth, curSize.width), + ToLengthWithFallback(pos.mHeight, curSize.height)); + + maxSize.width = std::max(maxSize.width, minSize.width); + maxSize.height = std::max(maxSize.height, minSize.height); + prefSize.width = + NS_CSS_MINMAX(prefSize.width, minSize.width, maxSize.width); + prefSize.height = + NS_CSS_MINMAX(prefSize.height, minSize.height, maxSize.height); + + nsMargin m; + childBox->StyleMargin()->GetMargin(m); + + ApplyMargin(curSize, m); + ApplyMargin(minSize, m); + ApplyMargin(maxSize, m); + ApplyMargin(prefSize, m); + + auto& list = isBefore ? mChildInfosBefore : mChildInfosAfter; + nsSplitterInfo& info = *list.AppendElement(); + info.childElem = content; + info.min = isHorizontal ? minSize.width : minSize.height; + info.max = isHorizontal ? maxSize.width : maxSize.height; + info.pref = isHorizontal ? prefSize.width : prefSize.height; + info.current = info.changed = isHorizontal ? curSize.width : curSize.height; + } + + if (!foundOuter) { + return NS_OK; + } + + mPressed = true; + + const bool reverseDirection = [&] { + MOZ_ASSERT(mParentBox->IsFlexContainerFrame()); + const FlexboxAxisInfo info(mParentBox); + if (!info.mIsRowOriented) { + return info.mIsMainAxisReversed; + } + const bool rtl = + mParentBox->StyleVisibility()->mDirection == StyleDirection::Rtl; + return info.mIsMainAxisReversed != rtl; + }(); + + if (reverseDirection) { + // The before array is really the after array, and the order needs to be + // reversed. First reverse both arrays. + mChildInfosBefore.Reverse(); + mChildInfosAfter.Reverse(); + + // Now swap the two arrays. + std::swap(mChildInfosBefore, mChildInfosAfter); + } + + // if resizebefore is not Farthest, reverse the list because the first child + // in the list is the farthest, and we want the first child to be the closest. + if (resizeBefore != ResizeType::Farthest) { + mChildInfosBefore.Reverse(); + } + + // if the resizeafter is the Farthest we must reverse the list because the + // first child in the list is the closest we want the first child to be the + // Farthest. + if (resizeAfter == ResizeType::Farthest) { + mChildInfosAfter.Reverse(); + } + + int32_t c; + nsPoint pt = + nsLayoutUtils::GetDOMEventCoordinatesRelativeTo(mouseEvent, mParentBox); + if (isHorizontal) { + c = pt.x; + mSplitterPos = mOuter->mRect.x; + } else { + c = pt.y; + mSplitterPos = mOuter->mRect.y; + } + + mDragStart = c; + + // printf("Pressed mDragStart=%d\n",mDragStart); + + PresShell::SetCapturingContent(mOuter->GetContent(), + CaptureFlags::IgnoreAllowedState); + + return NS_OK; +} + +nsresult nsSplitterFrameInner::MouseMove(Event* aMouseEvent) { + NS_ENSURE_TRUE(mOuter, NS_OK); + if (!mPressed) { + return NS_OK; + } + + if (mDragging) { + return NS_OK; + } + + nsCOMPtr<nsIDOMEventListener> kungfuDeathGrip(this); + mOuter->mContent->AsElement()->SetAttr(kNameSpaceID_None, nsGkAtoms::state, + u"dragging"_ns, true); + + RemoveListener(); + mDragging = true; + + return NS_OK; +} + +bool nsSplitterFrameInner::SupportsCollapseDirection( + nsSplitterFrameInner::CollapseDirection aDirection) { + static Element::AttrValuesArray strings[] = { + nsGkAtoms::before, nsGkAtoms::after, nsGkAtoms::both, nullptr}; + + switch (SplitterElement()->FindAttrValueIn( + kNameSpaceID_None, nsGkAtoms::collapse, strings, eCaseMatters)) { + case 0: + return (aDirection == Before); + case 1: + return (aDirection == After); + case 2: + return true; + } + + return false; +} + +static nsIFrame* SlowOrderAwareSibling(nsIFrame* aBox, bool aNext) { + nsIFrame* parent = aBox->GetParent(); + if (!parent) { + return nullptr; + } + CSSOrderAwareFrameIterator iter( + parent, FrameChildListID::Principal, + CSSOrderAwareFrameIterator::ChildFilter::IncludeAll, + CSSOrderAwareFrameIterator::OrderState::Unknown, + CSSOrderAwareFrameIterator::OrderingProperty::Order); + + nsIFrame* prevSibling = nullptr; + for (; !iter.AtEnd(); iter.Next()) { + nsIFrame* current = iter.get(); + if (!aNext && current == aBox) { + return prevSibling; + } + if (aNext && prevSibling == aBox) { + return current; + } + prevSibling = current; + } + return nullptr; +} + +void nsSplitterFrameInner::UpdateState() { + // State Transitions: + // Open -> Dragging + // Open -> CollapsedBefore + // Open -> CollapsedAfter + // CollapsedBefore -> Open + // CollapsedBefore -> Dragging + // CollapsedAfter -> Open + // CollapsedAfter -> Dragging + // Dragging -> Open + // Dragging -> CollapsedBefore (auto collapse) + // Dragging -> CollapsedAfter (auto collapse) + + State newState = GetState(); + + if (newState == mState) { + // No change. + return; + } + + if ((SupportsCollapseDirection(Before) || SupportsCollapseDirection(After)) && + IsValidParentBox(mOuter->GetParent())) { + // Find the splitter's immediate sibling. + const bool prev = + newState == State::CollapsedBefore || mState == State::CollapsedBefore; + nsIFrame* splitterSibling = SlowOrderAwareSibling(mOuter, !prev); + if (splitterSibling) { + nsCOMPtr<nsIContent> sibling = splitterSibling->GetContent(); + if (sibling && sibling->IsElement()) { + if (mState == State::CollapsedBefore || + mState == State::CollapsedAfter) { + // CollapsedBefore -> Open + // CollapsedBefore -> Dragging + // CollapsedAfter -> Open + // CollapsedAfter -> Dragging + nsContentUtils::AddScriptRunner(new nsUnsetAttrRunnable( + sibling->AsElement(), nsGkAtoms::collapsed)); + } else if ((mState == State::Open || mState == State::Dragging) && + (newState == State::CollapsedBefore || + newState == State::CollapsedAfter)) { + // Open -> CollapsedBefore / CollapsedAfter + // Dragging -> CollapsedBefore / CollapsedAfter + nsContentUtils::AddScriptRunner(new nsSetAttrRunnable( + sibling->AsElement(), nsGkAtoms::collapsed, u"true"_ns)); + } + } + } + } + mState = newState; +} + +void nsSplitterFrameInner::EnsureOrient() { + mOuter->mIsHorizontal = SplitterIsHorizontal(mParentBox); +} + +void nsSplitterFrameInner::AdjustChildren(nsPresContext* aPresContext) { + EnsureOrient(); + const bool isHorizontal = !mOuter->IsHorizontal(); + + AdjustChildren(aPresContext, mChildInfosBefore, isHorizontal); + AdjustChildren(aPresContext, mChildInfosAfter, isHorizontal); +} + +static nsIFrame* GetChildBoxForContent(nsIFrame* aParentBox, + nsIContent* aContent) { + // XXX Can this use GetPrimaryFrame? + for (nsIFrame* f : aParentBox->PrincipalChildList()) { + if (f->GetContent() == aContent) { + return f; + } + } + return nullptr; +} + +void nsSplitterFrameInner::AdjustChildren(nsPresContext* aPresContext, + nsTArray<nsSplitterInfo>& aChildInfos, + bool aIsHorizontal) { + /// printf("------- AdjustChildren------\n"); + + for (auto& info : aChildInfos) { + nscoord newPref = info.pref + (info.changed - info.current); + if (nsIFrame* childBox = + GetChildBoxForContent(mParentBox, info.childElem)) { + SetPreferredSize(childBox, aIsHorizontal, newPref); + } + } +} + +void nsSplitterFrameInner::SetPreferredSize(nsIFrame* aChildBox, + bool aIsHorizontal, nscoord aSize) { + nsMargin margin; + aChildBox->StyleMargin()->GetMargin(margin); + if (aIsHorizontal) { + aSize -= (margin.left + margin.right); + } else { + aSize -= (margin.top + margin.bottom); + } + + RefPtr element = nsStyledElement::FromNode(aChildBox->GetContent()); + if (!element) { + return; + } + + // We set both the attribute and the CSS value, so that XUL persist="" keeps + // working, see bug 1790712. + + int32_t pixels = aSize / AppUnitsPerCSSPixel(); + nsAutoString attrValue; + attrValue.AppendInt(pixels); + element->SetAttr(aIsHorizontal ? nsGkAtoms::width : nsGkAtoms::height, + attrValue, IgnoreErrors()); + + nsCOMPtr<nsICSSDeclaration> decl = element->Style(); + + nsAutoCString cssValue; + cssValue.AppendInt(pixels); + cssValue.AppendLiteral("px"); + decl->SetProperty(aIsHorizontal ? "width"_ns : "height"_ns, cssValue, ""_ns, + IgnoreErrors()); +} + +void nsSplitterFrameInner::AddRemoveSpace(nscoord aDiff, + nsTArray<nsSplitterInfo>& aChildInfos, + int32_t& aSpaceLeft) { + aSpaceLeft = 0; + + for (auto& info : aChildInfos) { + nscoord min = info.min; + nscoord max = info.max; + nscoord& c = info.changed; + + // figure our how much space to add or remove + if (c + aDiff < min) { + aDiff += (c - min); + c = min; + } else if (c + aDiff > max) { + aDiff -= (max - c); + c = max; + } else { + c += aDiff; + aDiff = 0; + } + + // there is not space left? We are done + if (aDiff == 0) { + break; + } + } + + aSpaceLeft = aDiff; +} + +/** + * Ok if we want to resize a child we will know the actual size in pixels we + * want it to be. This is not the preferred size. But the only way we can change + * a child is by manipulating its preferred size. So give the actual pixel size + * this method will figure out the preferred size and set it. + */ + +void nsSplitterFrameInner::ResizeChildTo(nscoord& aDiff) { + nscoord spaceLeft = 0; + + if (!mChildInfosBefore.IsEmpty()) { + AddRemoveSpace(aDiff, mChildInfosBefore, spaceLeft); + // If there is any space left over remove it from the diff we were + // originally given. + aDiff -= spaceLeft; + } + + AddRemoveSpace(-aDiff, mChildInfosAfter, spaceLeft); + + if (spaceLeft != 0 && !mChildInfosAfter.IsEmpty()) { + aDiff += spaceLeft; + AddRemoveSpace(spaceLeft, mChildInfosBefore, spaceLeft); + } +} |