diff options
Diffstat (limited to 'layout/xul/nsScrollbarFrame.cpp')
| -rw-r--r-- | layout/xul/nsScrollbarFrame.cpp | 595 |
1 files changed, 595 insertions, 0 deletions
diff --git a/layout/xul/nsScrollbarFrame.cpp b/layout/xul/nsScrollbarFrame.cpp new file mode 100644 index 0000000000..76304bf502 --- /dev/null +++ b/layout/xul/nsScrollbarFrame.cpp @@ -0,0 +1,595 @@ +/* -*- 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 "nsScrollbarFrame.h" +#include "nsSliderFrame.h" +#include "nsScrollbarButtonFrame.h" +#include "nsContentCreatorFunctions.h" +#include "nsGkAtoms.h" +#include "nsIScrollableFrame.h" +#include "nsIScrollbarMediator.h" +#include "nsStyleConsts.h" +#include "nsIContent.h" +#include "nsLayoutUtils.h" +#include "mozilla/LookAndFeel.h" +#include "mozilla/PresShell.h" +#include "mozilla/dom/Element.h" +#include "mozilla/dom/MutationEventBinding.h" +#include "mozilla/StaticPrefs_apz.h" + +using namespace mozilla; +using mozilla::dom::Element; + +// +// NS_NewScrollbarFrame +// +// Creates a new scrollbar frame and returns it +// +nsIFrame* NS_NewScrollbarFrame(PresShell* aPresShell, ComputedStyle* aStyle) { + return new (aPresShell) + nsScrollbarFrame(aStyle, aPresShell->GetPresContext()); +} + +NS_IMPL_FRAMEARENA_HELPERS(nsScrollbarFrame) + +NS_QUERYFRAME_HEAD(nsScrollbarFrame) + NS_QUERYFRAME_ENTRY(nsScrollbarFrame) + NS_QUERYFRAME_ENTRY(nsIAnonymousContentCreator) +NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame) + +void nsScrollbarFrame::Init(nsIContent* aContent, nsContainerFrame* aParent, + nsIFrame* aPrevInFlow) { + nsContainerFrame::Init(aContent, aParent, aPrevInFlow); + + // We want to be a reflow root since we use reflows to move the + // slider. Any reflow inside the scrollbar frame will be a reflow to + // move the slider and will thus not change anything outside of the + // scrollbar or change the size of the scrollbar frame. + AddStateBits(NS_FRAME_REFLOW_ROOT); +} + +void nsScrollbarFrame::Destroy(DestroyContext& aContext) { + aContext.AddAnonymousContent(mUpTopButton.forget()); + aContext.AddAnonymousContent(mDownTopButton.forget()); + aContext.AddAnonymousContent(mSlider.forget()); + aContext.AddAnonymousContent(mUpBottomButton.forget()); + aContext.AddAnonymousContent(mDownBottomButton.forget()); + nsContainerFrame::Destroy(aContext); +} + +void nsScrollbarFrame::Reflow(nsPresContext* aPresContext, + ReflowOutput& aDesiredSize, + const ReflowInput& aReflowInput, + nsReflowStatus& aStatus) { + MarkInReflow(); + MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!"); + + // We always take all the space we're given, and our track size in the other + // axis. + const bool horizontal = IsHorizontal(); + const auto wm = GetWritingMode(); + const auto minSize = aReflowInput.ComputedMinSize(); + + aDesiredSize.ISize(wm) = aReflowInput.ComputedISize(); + aDesiredSize.BSize(wm) = [&] { + if (aReflowInput.ComputedBSize() != NS_UNCONSTRAINEDSIZE) { + return aReflowInput.ComputedBSize(); + } + // We don't want to change our size during incremental reflow, see the + // reflow root comment in init. + if (!aReflowInput.mParentReflowInput) { + return GetLogicalSize(wm).BSize(wm); + } + return minSize.BSize(wm); + }(); + + const nsSize containerSize = aDesiredSize.PhysicalSize(); + const LogicalSize totalAvailSize = aDesiredSize.Size(wm); + LogicalPoint nextKidPos(wm); + + MOZ_ASSERT(!wm.IsVertical()); + const bool movesInInlineDirection = horizontal; + + // Layout our kids left to right / top to bottom. + for (nsIFrame* kid : mFrames) { + MOZ_ASSERT(!kid->GetWritingMode().IsOrthogonalTo(wm), + "We don't expect orthogonal scrollbar parts"); + const bool isSlider = kid->GetContent() == mSlider; + LogicalSize availSize = totalAvailSize; + { + // Assume we'll consume the same size before and after the slider. This is + // not a technically correct assumption if we have weird scrollbar button + // setups, but those will be going away, see bug 1824254. + const int32_t factor = isSlider ? 2 : 1; + if (movesInInlineDirection) { + availSize.ISize(wm) = + std::max(0, totalAvailSize.ISize(wm) - nextKidPos.I(wm) * factor); + } else { + availSize.BSize(wm) = + std::max(0, totalAvailSize.BSize(wm) - nextKidPos.B(wm) * factor); + } + } + + ReflowInput kidRI(aPresContext, aReflowInput, kid, availSize); + if (isSlider) { + // We want for the slider to take all the remaining available space. + kidRI.SetComputedISize(availSize.ISize(wm)); + kidRI.SetComputedBSize(availSize.BSize(wm)); + } else if (movesInInlineDirection) { + // Otherwise we want all the space in the axis we're not advancing in, and + // the default / minimum size on the other axis. + kidRI.SetComputedBSize(availSize.BSize(wm)); + } else { + kidRI.SetComputedISize(availSize.ISize(wm)); + } + + ReflowOutput kidDesiredSize(wm); + nsReflowStatus status; + const auto flags = ReflowChildFlags::Default; + ReflowChild(kid, aPresContext, kidDesiredSize, kidRI, wm, nextKidPos, + containerSize, flags, status); + // We haven't seen the slider yet, we can advance + FinishReflowChild(kid, aPresContext, kidDesiredSize, &kidRI, wm, nextKidPos, + containerSize, flags); + if (movesInInlineDirection) { + nextKidPos.I(wm) += kidDesiredSize.ISize(wm); + } else { + nextKidPos.B(wm) += kidDesiredSize.BSize(wm); + } + } + + aDesiredSize.SetOverflowAreasToDesiredBounds(); +} + +nsresult nsScrollbarFrame::AttributeChanged(int32_t aNameSpaceID, + nsAtom* aAttribute, + int32_t aModType) { + nsresult rv = + nsContainerFrame::AttributeChanged(aNameSpaceID, aAttribute, aModType); + + // Update value in our children + UpdateChildrenAttributeValue(aAttribute, true); + + // if the current position changes, notify any nsGfxScrollFrame + // parent we may have + if (aAttribute != nsGkAtoms::curpos) { + return rv; + } + + nsIScrollableFrame* scrollable = do_QueryFrame(GetParent()); + if (!scrollable) { + return rv; + } + + nsCOMPtr<nsIContent> content(mContent); + scrollable->CurPosAttributeChanged(content); + return rv; +} + +NS_IMETHODIMP +nsScrollbarFrame::HandlePress(nsPresContext* aPresContext, + WidgetGUIEvent* aEvent, + nsEventStatus* aEventStatus) { + return NS_OK; +} + +NS_IMETHODIMP +nsScrollbarFrame::HandleMultiplePress(nsPresContext* aPresContext, + WidgetGUIEvent* aEvent, + nsEventStatus* aEventStatus, + bool aControlHeld) { + return NS_OK; +} + +NS_IMETHODIMP +nsScrollbarFrame::HandleDrag(nsPresContext* aPresContext, + WidgetGUIEvent* aEvent, + nsEventStatus* aEventStatus) { + return NS_OK; +} + +NS_IMETHODIMP +nsScrollbarFrame::HandleRelease(nsPresContext* aPresContext, + WidgetGUIEvent* aEvent, + nsEventStatus* aEventStatus) { + return NS_OK; +} + +void nsScrollbarFrame::SetScrollbarMediatorContent(nsIContent* aMediator) { + mScrollbarMediator = aMediator; +} + +nsIScrollbarMediator* nsScrollbarFrame::GetScrollbarMediator() { + if (!mScrollbarMediator) { + return nullptr; + } + nsIFrame* f = mScrollbarMediator->GetPrimaryFrame(); + nsIScrollableFrame* scrollFrame = do_QueryFrame(f); + nsIScrollbarMediator* sbm; + + if (scrollFrame) { + nsIFrame* scrolledFrame = scrollFrame->GetScrolledFrame(); + sbm = do_QueryFrame(scrolledFrame); + if (sbm) { + return sbm; + } + } + sbm = do_QueryFrame(f); + if (f && !sbm) { + f = f->PresShell()->GetRootScrollFrame(); + if (f && f->GetContent() == mScrollbarMediator) { + return do_QueryFrame(f); + } + } + return sbm; +} + +bool nsScrollbarFrame::IsHorizontal() const { + auto appearance = StyleDisplay()->EffectiveAppearance(); + MOZ_ASSERT(appearance == StyleAppearance::ScrollbarHorizontal || + appearance == StyleAppearance::ScrollbarVertical); + return appearance == StyleAppearance::ScrollbarHorizontal; +} + +nsSize nsScrollbarFrame::ScrollbarMinSize() const { + nsPresContext* pc = PresContext(); + const LayoutDeviceIntSize widget = + pc->Theme()->GetMinimumWidgetSize(pc, const_cast<nsScrollbarFrame*>(this), + StyleDisplay()->EffectiveAppearance()); + return LayoutDeviceIntSize::ToAppUnits(widget, pc->AppUnitsPerDevPixel()); +} + +StyleScrollbarWidth nsScrollbarFrame::ScrollbarWidth() const { + return nsLayoutUtils::StyleForScrollbar(this) + ->StyleUIReset() + ->ScrollbarWidth(); +} + +nscoord nsScrollbarFrame::ScrollbarTrackSize() const { + nsPresContext* pc = PresContext(); + auto overlay = pc->UseOverlayScrollbars() ? nsITheme::Overlay::Yes + : nsITheme::Overlay::No; + return LayoutDevicePixel::ToAppUnits( + pc->Theme()->GetScrollbarSize(pc, ScrollbarWidth(), overlay), + pc->AppUnitsPerDevPixel()); +} + +void nsScrollbarFrame::SetIncrementToLine(int32_t aDirection) { + mSmoothScroll = true; + mDirection = aDirection; + mScrollUnit = ScrollUnit::LINES; + + // get the scrollbar's content node + nsIContent* content = GetContent(); + mIncrement = aDirection * nsSliderFrame::GetIncrement(content); +} + +void nsScrollbarFrame::SetIncrementToPage(int32_t aDirection) { + mSmoothScroll = true; + mDirection = aDirection; + mScrollUnit = ScrollUnit::PAGES; + + // get the scrollbar's content node + nsIContent* content = GetContent(); + mIncrement = aDirection * nsSliderFrame::GetPageIncrement(content); +} + +void nsScrollbarFrame::SetIncrementToWhole(int32_t aDirection) { + // Don't repeat or use smooth scrolling if scrolling to beginning or end + // of a page. + mSmoothScroll = false; + mDirection = aDirection; + mScrollUnit = ScrollUnit::WHOLE; + + // get the scrollbar's content node + nsIContent* content = GetContent(); + if (aDirection == -1) + mIncrement = -nsSliderFrame::GetCurrentPosition(content); + else + mIncrement = nsSliderFrame::GetMaxPosition(content) - + nsSliderFrame::GetCurrentPosition(content); +} + +int32_t nsScrollbarFrame::MoveToNewPosition( + ImplementsScrollByUnit aImplementsScrollByUnit) { + if (aImplementsScrollByUnit == ImplementsScrollByUnit::Yes && + StaticPrefs::apz_scrollbarbuttonrepeat_enabled()) { + nsIScrollbarMediator* m = GetScrollbarMediator(); + MOZ_ASSERT(m); + // aImplementsScrollByUnit being Yes indicates the caller doesn't care + // about the return value. + // Note that this `MoveToNewPosition` is used for scrolling triggered by + // repeating scrollbar button press, so we'd use an intended-direction + // scroll snap flag. + m->ScrollByUnit( + this, mSmoothScroll ? ScrollMode::Smooth : ScrollMode::Instant, + mDirection, mScrollUnit, ScrollSnapFlags::IntendedDirection); + return 0; + } + + // get the scrollbar's content node + RefPtr<Element> content = GetContent()->AsElement(); + + // get the current pos + int32_t curpos = nsSliderFrame::GetCurrentPosition(content); + + // get the max pos + int32_t maxpos = nsSliderFrame::GetMaxPosition(content); + + // increment the given amount + if (mIncrement) { + curpos += mIncrement; + } + + // make sure the current position is between the current and max positions + if (curpos < 0) { + curpos = 0; + } else if (curpos > maxpos) { + curpos = maxpos; + } + + // set the current position of the slider. + nsAutoString curposStr; + curposStr.AppendInt(curpos); + + AutoWeakFrame weakFrame(this); + if (mSmoothScroll) { + content->SetAttr(kNameSpaceID_None, nsGkAtoms::smooth, u"true"_ns, false); + } + content->SetAttr(kNameSpaceID_None, nsGkAtoms::curpos, curposStr, false); + // notify the nsScrollbarFrame of the change + AttributeChanged(kNameSpaceID_None, nsGkAtoms::curpos, + dom::MutationEvent_Binding::MODIFICATION); + if (!weakFrame.IsAlive()) { + return curpos; + } + // notify all nsSliderFrames of the change + for (const auto& childList : ChildLists()) { + for (nsIFrame* f : childList.mList) { + nsSliderFrame* sliderFrame = do_QueryFrame(f); + if (sliderFrame) { + sliderFrame->AttributeChanged(kNameSpaceID_None, nsGkAtoms::curpos, + dom::MutationEvent_Binding::MODIFICATION); + if (!weakFrame.IsAlive()) { + return curpos; + } + } + } + } + content->UnsetAttr(kNameSpaceID_None, nsGkAtoms::smooth, false); + return curpos; +} + +static already_AddRefed<Element> MakeScrollbarButton( + dom::NodeInfo* aNodeInfo, bool aVertical, bool aBottom, bool aDown, + AnonymousContentKey& aKey) { + MOZ_ASSERT(aNodeInfo); + MOZ_ASSERT( + aNodeInfo->Equals(nsGkAtoms::scrollbarbutton, nullptr, kNameSpaceID_XUL)); + + static constexpr nsLiteralString kSbattrValues[2][2] = { + { + u"scrollbar-up-top"_ns, + u"scrollbar-up-bottom"_ns, + }, + { + u"scrollbar-down-top"_ns, + u"scrollbar-down-bottom"_ns, + }, + }; + + static constexpr nsLiteralString kTypeValues[2] = { + u"decrement"_ns, + u"increment"_ns, + }; + + aKey = AnonymousContentKey::Type_ScrollbarButton; + if (aVertical) { + aKey |= AnonymousContentKey::Flag_Vertical; + } + if (aBottom) { + aKey |= AnonymousContentKey::Flag_ScrollbarButton_Bottom; + } + if (aDown) { + aKey |= AnonymousContentKey::Flag_ScrollbarButton_Down; + } + + RefPtr<Element> e; + NS_TrustedNewXULElement(getter_AddRefs(e), do_AddRef(aNodeInfo)); + e->SetAttr(kNameSpaceID_None, nsGkAtoms::sbattr, + kSbattrValues[aDown][aBottom], false); + e->SetAttr(kNameSpaceID_None, nsGkAtoms::type, kTypeValues[aDown], false); + return e.forget(); +} + +nsresult nsScrollbarFrame::CreateAnonymousContent( + nsTArray<ContentInfo>& aElements) { + nsNodeInfoManager* nodeInfoManager = mContent->NodeInfo()->NodeInfoManager(); + Element* el = GetContent()->AsElement(); + + // If there are children already in the node, don't create any anonymous + // content (this only apply to crashtests/369038-1.xhtml) + if (el->HasChildren()) { + return NS_OK; + } + + nsAutoString orient; + el->GetAttr(nsGkAtoms::orient, orient); + bool vertical = orient.EqualsLiteral("vertical"); + + RefPtr<dom::NodeInfo> sbbNodeInfo = + nodeInfoManager->GetNodeInfo(nsGkAtoms::scrollbarbutton, nullptr, + kNameSpaceID_XUL, nsINode::ELEMENT_NODE); + + bool createButtons = PresContext()->Theme()->ThemeSupportsScrollbarButtons(); + + if (createButtons) { + AnonymousContentKey key; + mUpTopButton = + MakeScrollbarButton(sbbNodeInfo, vertical, /* aBottom */ false, + /* aDown */ false, key); + aElements.AppendElement(ContentInfo(mUpTopButton, key)); + } + + if (createButtons) { + AnonymousContentKey key; + mDownTopButton = + MakeScrollbarButton(sbbNodeInfo, vertical, /* aBottom */ false, + /* aDown */ true, key); + aElements.AppendElement(ContentInfo(mDownTopButton, key)); + } + + { + AnonymousContentKey key = AnonymousContentKey::Type_Slider; + if (vertical) { + key |= AnonymousContentKey::Flag_Vertical; + } + + NS_TrustedNewXULElement( + getter_AddRefs(mSlider), + nodeInfoManager->GetNodeInfo(nsGkAtoms::slider, nullptr, + kNameSpaceID_XUL, nsINode::ELEMENT_NODE)); + mSlider->SetAttr(kNameSpaceID_None, nsGkAtoms::orient, orient, false); + + aElements.AppendElement(ContentInfo(mSlider, key)); + + NS_TrustedNewXULElement( + getter_AddRefs(mThumb), + nodeInfoManager->GetNodeInfo(nsGkAtoms::thumb, nullptr, + kNameSpaceID_XUL, nsINode::ELEMENT_NODE)); + mThumb->SetAttr(kNameSpaceID_None, nsGkAtoms::orient, orient, false); + mSlider->AppendChildTo(mThumb, false, IgnoreErrors()); + } + + if (createButtons) { + AnonymousContentKey key; + mUpBottomButton = + MakeScrollbarButton(sbbNodeInfo, vertical, /* aBottom */ true, + /* aDown */ false, key); + aElements.AppendElement(ContentInfo(mUpBottomButton, key)); + } + + if (createButtons) { + AnonymousContentKey key; + mDownBottomButton = + MakeScrollbarButton(sbbNodeInfo, vertical, /* aBottom */ true, + /* aDown */ true, key); + aElements.AppendElement(ContentInfo(mDownBottomButton, key)); + } + + // Don't cache styles if we are inside a <select> element, since we have + // some UA style sheet rules that depend on the <select>'s attributes. + if (GetContent()->GetParent() && + GetContent()->GetParent()->IsHTMLElement(nsGkAtoms::select)) { + for (auto& info : aElements) { + info.mKey = AnonymousContentKey::None; + } + } + + UpdateChildrenAttributeValue(nsGkAtoms::curpos, false); + UpdateChildrenAttributeValue(nsGkAtoms::maxpos, false); + UpdateChildrenAttributeValue(nsGkAtoms::disabled, false); + UpdateChildrenAttributeValue(nsGkAtoms::pageincrement, false); + UpdateChildrenAttributeValue(nsGkAtoms::increment, false); + + return NS_OK; +} + +void nsScrollbarFrame::UpdateChildrenAttributeValue(nsAtom* aAttribute, + bool aNotify) { + Element* el = GetContent()->AsElement(); + + nsAutoString value; + el->GetAttr(aAttribute, value); + + if (!el->HasAttr(aAttribute)) { + if (mUpTopButton) { + mUpTopButton->UnsetAttr(kNameSpaceID_None, aAttribute, aNotify); + } + if (mDownTopButton) { + mDownTopButton->UnsetAttr(kNameSpaceID_None, aAttribute, aNotify); + } + if (mSlider) { + mSlider->UnsetAttr(kNameSpaceID_None, aAttribute, aNotify); + } + if (mUpBottomButton) { + mUpBottomButton->UnsetAttr(kNameSpaceID_None, aAttribute, aNotify); + } + if (mDownBottomButton) { + mDownBottomButton->UnsetAttr(kNameSpaceID_None, aAttribute, aNotify); + } + return; + } + + if (aAttribute == nsGkAtoms::curpos || aAttribute == nsGkAtoms::maxpos) { + if (mUpTopButton) { + mUpTopButton->SetAttr(kNameSpaceID_None, aAttribute, value, aNotify); + } + if (mDownTopButton) { + mDownTopButton->SetAttr(kNameSpaceID_None, aAttribute, value, aNotify); + } + if (mSlider) { + mSlider->SetAttr(kNameSpaceID_None, aAttribute, value, aNotify); + } + if (mUpBottomButton) { + mUpBottomButton->SetAttr(kNameSpaceID_None, aAttribute, value, aNotify); + } + if (mDownBottomButton) { + mDownBottomButton->SetAttr(kNameSpaceID_None, aAttribute, value, aNotify); + } + } else if (aAttribute == nsGkAtoms::disabled) { + if (mUpTopButton) { + mUpTopButton->SetAttr(kNameSpaceID_None, aAttribute, value, aNotify); + } + if (mDownTopButton) { + mDownTopButton->SetAttr(kNameSpaceID_None, aAttribute, value, aNotify); + } + if (mSlider) { + mSlider->SetAttr(kNameSpaceID_None, aAttribute, value, aNotify); + } + if (mUpBottomButton) { + mUpBottomButton->SetAttr(kNameSpaceID_None, aAttribute, value, aNotify); + } + if (mDownBottomButton) { + mDownBottomButton->SetAttr(kNameSpaceID_None, aAttribute, value, aNotify); + } + } else if (aAttribute == nsGkAtoms::pageincrement || + aAttribute == nsGkAtoms::increment) { + if (mSlider) { + mSlider->SetAttr(kNameSpaceID_None, aAttribute, value, aNotify); + } + } +} + +void nsScrollbarFrame::AppendAnonymousContentTo( + nsTArray<nsIContent*>& aElements, uint32_t aFilter) { + if (mUpTopButton) { + aElements.AppendElement(mUpTopButton); + } + + if (mDownTopButton) { + aElements.AppendElement(mDownTopButton); + } + + if (mSlider) { + aElements.AppendElement(mSlider); + } + + if (mUpBottomButton) { + aElements.AppendElement(mUpBottomButton); + } + + if (mDownBottomButton) { + aElements.AppendElement(mDownBottomButton); + } +} |