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Diffstat (limited to 'layout/forms/nsRangeFrame.cpp')
| -rw-r--r-- | layout/forms/nsRangeFrame.cpp | 780 |
1 files changed, 780 insertions, 0 deletions
diff --git a/layout/forms/nsRangeFrame.cpp b/layout/forms/nsRangeFrame.cpp new file mode 100644 index 0000000000..2cccff715a --- /dev/null +++ b/layout/forms/nsRangeFrame.cpp @@ -0,0 +1,780 @@ +/* -*- 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/. */ + +#include "nsRangeFrame.h" + +#include "ListMutationObserver.h" +#include "mozilla/Assertions.h" +#include "mozilla/PresShell.h" +#include "mozilla/TouchEvents.h" + +#include "gfxContext.h" +#include "nsContentCreatorFunctions.h" +#include "nsCSSRendering.h" +#include "nsDisplayList.h" +#include "nsIContent.h" +#include "nsLayoutUtils.h" +#include "mozilla/dom/Document.h" +#include "nsGkAtoms.h" +#include "mozilla/dom/HTMLDataListElement.h" +#include "mozilla/dom/HTMLInputElement.h" +#include "mozilla/dom/HTMLOptionElement.h" +#include "mozilla/dom/MutationEventBinding.h" +#include "nsPresContext.h" +#include "nsNodeInfoManager.h" +#include "mozilla/dom/Element.h" +#include "mozilla/ServoStyleSet.h" +#include "nsTArray.h" + +#ifdef ACCESSIBILITY +# include "nsAccessibilityService.h" +#endif + +// Our intrinsic size is 12em in the main-axis and 1.3em in the cross-axis. +#define MAIN_AXIS_EM_SIZE 12 +#define CROSS_AXIS_EM_SIZE 1.3f + +using namespace mozilla; +using namespace mozilla::dom; +using namespace mozilla::image; + +nsIFrame* NS_NewRangeFrame(PresShell* aPresShell, ComputedStyle* aStyle) { + return new (aPresShell) nsRangeFrame(aStyle, aPresShell->GetPresContext()); +} + +nsRangeFrame::nsRangeFrame(ComputedStyle* aStyle, nsPresContext* aPresContext) + : nsContainerFrame(aStyle, aPresContext, kClassID) {} + +void nsRangeFrame::Init(nsIContent* aContent, nsContainerFrame* aParent, + nsIFrame* aPrevInFlow) { + nsContainerFrame::Init(aContent, aParent, aPrevInFlow); + if (InputElement().HasAttr(nsGkAtoms::list_)) { + mListMutationObserver = new ListMutationObserver(*this); + } +} + +nsRangeFrame::~nsRangeFrame() = default; + +NS_IMPL_FRAMEARENA_HELPERS(nsRangeFrame) + +NS_QUERYFRAME_HEAD(nsRangeFrame) + NS_QUERYFRAME_ENTRY(nsRangeFrame) + NS_QUERYFRAME_ENTRY(nsIAnonymousContentCreator) +NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame) + +void nsRangeFrame::Destroy(DestroyContext& aContext) { + NS_ASSERTION(!GetPrevContinuation() && !GetNextContinuation(), + "nsRangeFrame should not have continuations; if it does we " + "need to call RegUnregAccessKey only for the first."); + + if (mListMutationObserver) { + mListMutationObserver->Detach(); + } + aContext.AddAnonymousContent(mTrackDiv.forget()); + aContext.AddAnonymousContent(mProgressDiv.forget()); + aContext.AddAnonymousContent(mThumbDiv.forget()); + nsContainerFrame::Destroy(aContext); +} + +static already_AddRefed<Element> MakeAnonymousDiv( + Document& aDoc, PseudoStyleType aOldPseudoType, + PseudoStyleType aModernPseudoType, + nsTArray<nsIAnonymousContentCreator::ContentInfo>& aElements) { + RefPtr<Element> result = aDoc.CreateHTMLElement(nsGkAtoms::div); + + // Associate the pseudo-element with the anonymous child. + if (StaticPrefs::layout_css_modern_range_pseudos_enabled()) { + result->SetPseudoElementType(aModernPseudoType); + } else { + result->SetPseudoElementType(aOldPseudoType); + } + + // XXX(Bug 1631371) Check if this should use a fallible operation as it + // pretended earlier, or change the return type to void. + aElements.AppendElement(result); + + return result.forget(); +} + +nsresult nsRangeFrame::CreateAnonymousContent( + nsTArray<ContentInfo>& aElements) { + Document* doc = mContent->OwnerDoc(); + // Create the ::-moz-range-track pseudo-element (a div): + mTrackDiv = MakeAnonymousDiv(*doc, PseudoStyleType::mozRangeTrack, + PseudoStyleType::sliderTrack, aElements); + // Create the ::-moz-range-progress pseudo-element (a div): + mProgressDiv = MakeAnonymousDiv(*doc, PseudoStyleType::mozRangeProgress, + PseudoStyleType::sliderFill, aElements); + // Create the ::-moz-range-thumb pseudo-element (a div): + mThumbDiv = MakeAnonymousDiv(*doc, PseudoStyleType::mozRangeThumb, + PseudoStyleType::sliderThumb, aElements); + return NS_OK; +} + +void nsRangeFrame::AppendAnonymousContentTo(nsTArray<nsIContent*>& aElements, + uint32_t aFilter) { + if (mTrackDiv) { + aElements.AppendElement(mTrackDiv); + } + + if (mProgressDiv) { + aElements.AppendElement(mProgressDiv); + } + + if (mThumbDiv) { + aElements.AppendElement(mThumbDiv); + } +} + +void nsRangeFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder, + const nsDisplayListSet& aLists) { + const nsStyleDisplay* disp = StyleDisplay(); + if (IsThemed(disp)) { + DisplayBorderBackgroundOutline(aBuilder, aLists); + // Only create items for the thumb. Specifically, we do not want the track + // to paint, since *our* background is used to paint the track, and we don't + // want the unthemed track painting over the top of the themed track. + // This logic is copied from + // nsContainerFrame::BuildDisplayListForNonBlockChildren as + // called by BuildDisplayListForInline. + if (nsIFrame* thumb = mThumbDiv->GetPrimaryFrame()) { + nsDisplayListSet set(aLists, aLists.Content()); + BuildDisplayListForChild(aBuilder, thumb, set, DisplayChildFlag::Inline); + } + } else { + BuildDisplayListForInline(aBuilder, aLists); + } +} + +void nsRangeFrame::Reflow(nsPresContext* aPresContext, + ReflowOutput& aDesiredSize, + const ReflowInput& aReflowInput, + nsReflowStatus& aStatus) { + MarkInReflow(); + DO_GLOBAL_REFLOW_COUNT("nsRangeFrame"); + DISPLAY_REFLOW(aPresContext, this, aReflowInput, aDesiredSize, aStatus); + MOZ_ASSERT(aStatus.IsEmpty(), "Caller should pass a fresh reflow status!"); + + NS_ASSERTION(mTrackDiv, "::-moz-range-track div must exist!"); + NS_ASSERTION(mProgressDiv, "::-moz-range-progress div must exist!"); + NS_ASSERTION(mThumbDiv, "::-moz-range-thumb div must exist!"); + NS_ASSERTION(!GetPrevContinuation() && !GetNextContinuation(), + "nsRangeFrame should not have continuations; if it does we " + "need to call RegUnregAccessKey only for the first."); + + WritingMode wm = aReflowInput.GetWritingMode(); + nscoord computedBSize = aReflowInput.ComputedBSize(); + if (computedBSize == NS_UNCONSTRAINEDSIZE) { + computedBSize = 0; + } + const auto borderPadding = aReflowInput.ComputedLogicalBorderPadding(wm); + LogicalSize finalSize( + wm, aReflowInput.ComputedISize() + borderPadding.IStartEnd(wm), + computedBSize + borderPadding.BStartEnd(wm)); + aDesiredSize.SetSize(wm, finalSize); + + ReflowAnonymousContent(aPresContext, aDesiredSize, aReflowInput); + + aDesiredSize.SetOverflowAreasToDesiredBounds(); + + nsIFrame* trackFrame = mTrackDiv->GetPrimaryFrame(); + if (trackFrame) { + ConsiderChildOverflow(aDesiredSize.mOverflowAreas, trackFrame); + } + + nsIFrame* rangeProgressFrame = mProgressDiv->GetPrimaryFrame(); + if (rangeProgressFrame) { + ConsiderChildOverflow(aDesiredSize.mOverflowAreas, rangeProgressFrame); + } + + nsIFrame* thumbFrame = mThumbDiv->GetPrimaryFrame(); + if (thumbFrame) { + ConsiderChildOverflow(aDesiredSize.mOverflowAreas, thumbFrame); + } + + FinishAndStoreOverflow(&aDesiredSize); + + MOZ_ASSERT(aStatus.IsEmpty(), "This type of frame can't be split."); +} + +void nsRangeFrame::ReflowAnonymousContent(nsPresContext* aPresContext, + ReflowOutput& aDesiredSize, + const ReflowInput& aReflowInput) { + // The width/height of our content box, which is the available width/height + // for our anonymous content: + nscoord rangeFrameContentBoxWidth = aReflowInput.ComputedWidth(); + nscoord rangeFrameContentBoxHeight = aReflowInput.ComputedHeight(); + if (rangeFrameContentBoxHeight == NS_UNCONSTRAINEDSIZE) { + rangeFrameContentBoxHeight = 0; + } + + nsIFrame* trackFrame = mTrackDiv->GetPrimaryFrame(); + + if (trackFrame) { // display:none? + + // Position the track: + // The idea here is that we allow content authors to style the width, + // height, border and padding of the track, but we ignore margin and + // positioning properties and do the positioning ourself to keep the center + // of the track's border box on the center of the nsRangeFrame's content + // box. + + WritingMode wm = trackFrame->GetWritingMode(); + LogicalSize availSize = aReflowInput.ComputedSize(wm); + availSize.BSize(wm) = NS_UNCONSTRAINEDSIZE; + ReflowInput trackReflowInput(aPresContext, aReflowInput, trackFrame, + availSize); + + // Find the x/y position of the track frame such that it will be positioned + // as described above. These coordinates are with respect to the + // nsRangeFrame's border-box. + nscoord trackX = rangeFrameContentBoxWidth / 2; + nscoord trackY = rangeFrameContentBoxHeight / 2; + + // Account for the track's border and padding (we ignore its margin): + trackX -= trackReflowInput.ComputedPhysicalBorderPadding().left + + trackReflowInput.ComputedWidth() / 2; + trackY -= trackReflowInput.ComputedPhysicalBorderPadding().top + + trackReflowInput.ComputedHeight() / 2; + + // Make relative to our border box instead of our content box: + trackX += aReflowInput.ComputedPhysicalBorderPadding().left; + trackY += aReflowInput.ComputedPhysicalBorderPadding().top; + + nsReflowStatus frameStatus; + ReflowOutput trackDesiredSize(aReflowInput); + ReflowChild(trackFrame, aPresContext, trackDesiredSize, trackReflowInput, + trackX, trackY, ReflowChildFlags::Default, frameStatus); + MOZ_ASSERT( + frameStatus.IsFullyComplete(), + "We gave our child unconstrained height, so it should be complete"); + FinishReflowChild(trackFrame, aPresContext, trackDesiredSize, + &trackReflowInput, trackX, trackY, + ReflowChildFlags::Default); + } + + nsIFrame* thumbFrame = mThumbDiv->GetPrimaryFrame(); + + if (thumbFrame) { // display:none? + WritingMode wm = thumbFrame->GetWritingMode(); + LogicalSize availSize = aReflowInput.ComputedSize(wm); + availSize.BSize(wm) = NS_UNCONSTRAINEDSIZE; + ReflowInput thumbReflowInput(aPresContext, aReflowInput, thumbFrame, + availSize); + + // Where we position the thumb depends on its size, so we first reflow + // the thumb at {0,0} to obtain its size, then position it afterwards. + + nsReflowStatus frameStatus; + ReflowOutput thumbDesiredSize(aReflowInput); + ReflowChild(thumbFrame, aPresContext, thumbDesiredSize, thumbReflowInput, 0, + 0, ReflowChildFlags::Default, frameStatus); + MOZ_ASSERT( + frameStatus.IsFullyComplete(), + "We gave our child unconstrained height, so it should be complete"); + FinishReflowChild(thumbFrame, aPresContext, thumbDesiredSize, + &thumbReflowInput, 0, 0, ReflowChildFlags::Default); + DoUpdateThumbPosition(thumbFrame, + nsSize(aDesiredSize.Width(), aDesiredSize.Height())); + } + + nsIFrame* rangeProgressFrame = mProgressDiv->GetPrimaryFrame(); + + if (rangeProgressFrame) { // display:none? + WritingMode wm = rangeProgressFrame->GetWritingMode(); + LogicalSize availSize = aReflowInput.ComputedSize(wm); + availSize.BSize(wm) = NS_UNCONSTRAINEDSIZE; + ReflowInput progressReflowInput(aPresContext, aReflowInput, + rangeProgressFrame, availSize); + + // We first reflow the range-progress frame at {0,0} to obtain its + // unadjusted dimensions, then we adjust it to so that the appropriate edge + // ends at the thumb. + + nsReflowStatus frameStatus; + ReflowOutput progressDesiredSize(aReflowInput); + ReflowChild(rangeProgressFrame, aPresContext, progressDesiredSize, + progressReflowInput, 0, 0, ReflowChildFlags::Default, + frameStatus); + MOZ_ASSERT( + frameStatus.IsFullyComplete(), + "We gave our child unconstrained height, so it should be complete"); + FinishReflowChild(rangeProgressFrame, aPresContext, progressDesiredSize, + &progressReflowInput, 0, 0, ReflowChildFlags::Default); + DoUpdateRangeProgressFrame( + rangeProgressFrame, + nsSize(aDesiredSize.Width(), aDesiredSize.Height())); + } +} + +#ifdef ACCESSIBILITY +a11y::AccType nsRangeFrame::AccessibleType() { return a11y::eHTMLRangeType; } +#endif + +double nsRangeFrame::GetValueAsFractionOfRange() { + const auto& input = InputElement(); + if (MOZ_UNLIKELY(!input.IsDoneCreating())) { + // Our element isn't done being created, so its values haven't yet been + // sanitized! (It's rare that we'd be reflowed when our element is in this + // state, but it can happen if the parser decides to yield while processing + // its tasks to build the element.) We can't trust that any of our numeric + // values will make sense until they've been sanitized; so for now, just + // use 0.0 as a fallback fraction-of-range value here (i.e. behave as if + // we're at our minimum, which is how the spec handles some edge cases). + return 0.0; + } + return GetDoubleAsFractionOfRange(input.GetValueAsDecimal()); +} + +double nsRangeFrame::GetDoubleAsFractionOfRange(const Decimal& aValue) { + auto& input = InputElement(); + + Decimal minimum = input.GetMinimum(); + Decimal maximum = input.GetMaximum(); + + MOZ_ASSERT(aValue.isFinite() && minimum.isFinite() && maximum.isFinite(), + "type=range should have a default maximum/minimum"); + + if (maximum <= minimum) { + // Avoid rounding triggering the assert by checking against an epsilon. + MOZ_ASSERT((aValue - minimum).abs().toDouble() < + std::numeric_limits<float>::epsilon(), + "Unsanitized value"); + return 0.0; + } + + MOZ_ASSERT(aValue >= minimum && aValue <= maximum, "Unsanitized value"); + + return ((aValue - minimum) / (maximum - minimum)).toDouble(); +} + +Decimal nsRangeFrame::GetValueAtEventPoint(WidgetGUIEvent* aEvent) { + MOZ_ASSERT( + aEvent->mClass == eMouseEventClass || aEvent->mClass == eTouchEventClass, + "Unexpected event type - aEvent->mRefPoint may be meaningless"); + + MOZ_ASSERT(mContent->IsHTMLElement(nsGkAtoms::input), "bad cast"); + dom::HTMLInputElement* input = + static_cast<dom::HTMLInputElement*>(GetContent()); + + MOZ_ASSERT(input->ControlType() == FormControlType::InputRange); + + Decimal minimum = input->GetMinimum(); + Decimal maximum = input->GetMaximum(); + MOZ_ASSERT(minimum.isFinite() && maximum.isFinite(), + "type=range should have a default maximum/minimum"); + if (maximum <= minimum) { + return minimum; + } + Decimal range = maximum - minimum; + + LayoutDeviceIntPoint absPoint; + if (aEvent->mClass == eTouchEventClass) { + MOZ_ASSERT(aEvent->AsTouchEvent()->mTouches.Length() == 1, + "Unexpected number of mTouches"); + absPoint = aEvent->AsTouchEvent()->mTouches[0]->mRefPoint; + } else { + absPoint = aEvent->mRefPoint; + } + nsPoint point = nsLayoutUtils::GetEventCoordinatesRelativeTo( + aEvent, absPoint, RelativeTo{this}); + + if (point == nsPoint(NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE)) { + // We don't want to change the current value for this error state. + return static_cast<dom::HTMLInputElement*>(GetContent()) + ->GetValueAsDecimal(); + } + + nsRect rangeContentRect = GetContentRectRelativeToSelf(); + nsSize thumbSize; + + if (IsThemed()) { + // We need to get the size of the thumb from the theme. + nsPresContext* pc = PresContext(); + LayoutDeviceIntSize size = pc->Theme()->GetMinimumWidgetSize( + pc, this, StyleAppearance::RangeThumb); + thumbSize = + LayoutDeviceIntSize::ToAppUnits(size, pc->AppUnitsPerDevPixel()); + // For GTK, GetMinimumWidgetSize returns zero for the thumb dimension + // perpendicular to the orientation of the slider. That's okay since we + // only care about the dimension in the direction of the slider when using + // |thumbSize| below, but it means this assertion need to check + // IsHorizontal(). + MOZ_ASSERT((IsHorizontal() && thumbSize.width > 0) || + (!IsHorizontal() && thumbSize.height > 0), + "The thumb is expected to take up some slider space"); + } else { + nsIFrame* thumbFrame = mThumbDiv->GetPrimaryFrame(); + if (thumbFrame) { // diplay:none? + thumbSize = thumbFrame->GetSize(); + } + } + + Decimal fraction; + if (IsHorizontal()) { + nscoord traversableDistance = rangeContentRect.width - thumbSize.width; + if (traversableDistance <= 0) { + return minimum; + } + nscoord posAtStart = rangeContentRect.x + thumbSize.width / 2; + nscoord posAtEnd = posAtStart + traversableDistance; + nscoord posOfPoint = mozilla::clamped(point.x, posAtStart, posAtEnd); + fraction = Decimal(posOfPoint - posAtStart) / Decimal(traversableDistance); + if (IsRightToLeft()) { + fraction = Decimal(1) - fraction; + } + } else { + nscoord traversableDistance = rangeContentRect.height - thumbSize.height; + if (traversableDistance <= 0) { + return minimum; + } + nscoord posAtStart = rangeContentRect.y + thumbSize.height / 2; + nscoord posAtEnd = posAtStart + traversableDistance; + nscoord posOfPoint = mozilla::clamped(point.y, posAtStart, posAtEnd); + // For a vertical range, the top (posAtStart) is the highest value, so we + // subtract the fraction from 1.0 to get that polarity correct. + fraction = Decimal(posOfPoint - posAtStart) / Decimal(traversableDistance); + if (IsUpwards()) { + fraction = Decimal(1) - fraction; + } + } + + MOZ_ASSERT(fraction >= Decimal(0) && fraction <= Decimal(1)); + return minimum + fraction * range; +} + +void nsRangeFrame::UpdateForValueChange() { + if (IsSubtreeDirty()) { + return; // we're going to be updated when we reflow + } + nsIFrame* rangeProgressFrame = mProgressDiv->GetPrimaryFrame(); + nsIFrame* thumbFrame = mThumbDiv->GetPrimaryFrame(); + if (!rangeProgressFrame && !thumbFrame) { + return; // diplay:none? + } + if (rangeProgressFrame) { + DoUpdateRangeProgressFrame(rangeProgressFrame, GetSize()); + } + if (thumbFrame) { + DoUpdateThumbPosition(thumbFrame, GetSize()); + } + if (IsThemed()) { + // We don't know the exact dimensions or location of the thumb when native + // theming is applied, so we just repaint the entire range. + InvalidateFrame(); + } + +#ifdef ACCESSIBILITY + if (nsAccessibilityService* accService = GetAccService()) { + accService->RangeValueChanged(PresShell(), mContent); + } +#endif + + SchedulePaint(); +} + +nsTArray<Decimal> nsRangeFrame::TickMarks() { + nsTArray<Decimal> tickMarks; + auto& input = InputElement(); + auto* list = input.GetList(); + if (!list) { + return tickMarks; + } + auto min = input.GetMinimum(); + auto max = input.GetMaximum(); + auto* options = list->Options(); + nsAutoString label; + for (uint32_t i = 0; i < options->Length(); ++i) { + auto* item = options->Item(i); + auto* option = HTMLOptionElement::FromNode(item); + MOZ_ASSERT(option); + if (option->Disabled()) { + continue; + } + nsAutoString str; + option->GetValue(str); + auto tickMark = HTMLInputElement::StringToDecimal(str); + if (tickMark.isNaN() || tickMark < min || tickMark > max || + input.ValueIsStepMismatch(tickMark)) { + continue; + } + tickMarks.AppendElement(tickMark); + } + tickMarks.Sort(); + return tickMarks; +} + +Decimal nsRangeFrame::NearestTickMark(const Decimal& aValue) { + auto tickMarks = TickMarks(); + if (tickMarks.IsEmpty() || aValue.isNaN()) { + return Decimal::nan(); + } + size_t index; + if (BinarySearch(tickMarks, 0, tickMarks.Length(), aValue, &index)) { + return tickMarks[index]; + } + if (index == tickMarks.Length()) { + return tickMarks.LastElement(); + } + if (index == 0) { + return tickMarks[0]; + } + const auto& smallerTickMark = tickMarks[index - 1]; + const auto& largerTickMark = tickMarks[index]; + MOZ_ASSERT(smallerTickMark < aValue); + MOZ_ASSERT(largerTickMark > aValue); + return (aValue - smallerTickMark).abs() < (aValue - largerTickMark).abs() + ? smallerTickMark + : largerTickMark; +} + +mozilla::dom::HTMLInputElement& nsRangeFrame::InputElement() const { + MOZ_ASSERT(mContent->IsHTMLElement(nsGkAtoms::input), "bad cast"); + auto& input = *static_cast<dom::HTMLInputElement*>(GetContent()); + MOZ_ASSERT(input.ControlType() == FormControlType::InputRange); + return input; +} + +void nsRangeFrame::DoUpdateThumbPosition(nsIFrame* aThumbFrame, + const nsSize& aRangeSize) { + MOZ_ASSERT(aThumbFrame); + + // The idea here is that we want to position the thumb so that the center + // of the thumb is on an imaginary line drawn from the middle of one edge + // of the range frame's content box to the middle of the opposite edge of + // its content box (the opposite edges being the left/right edge if the + // range is horizontal, or else the top/bottom edges if the range is + // vertical). How far along this line the center of the thumb is placed + // depends on the value of the range. + + nsMargin borderAndPadding = GetUsedBorderAndPadding(); + nsPoint newPosition(borderAndPadding.left, borderAndPadding.top); + + nsSize rangeContentBoxSize(aRangeSize); + rangeContentBoxSize.width -= borderAndPadding.LeftRight(); + rangeContentBoxSize.height -= borderAndPadding.TopBottom(); + + nsSize thumbSize = aThumbFrame->GetSize(); + double fraction = GetValueAsFractionOfRange(); + MOZ_ASSERT(fraction >= 0.0 && fraction <= 1.0); + + if (IsHorizontal()) { + if (thumbSize.width < rangeContentBoxSize.width) { + nscoord traversableDistance = rangeContentBoxSize.width - thumbSize.width; + if (IsRightToLeft()) { + newPosition.x += NSToCoordRound((1.0 - fraction) * traversableDistance); + } else { + newPosition.x += NSToCoordRound(fraction * traversableDistance); + } + newPosition.y += (rangeContentBoxSize.height - thumbSize.height) / 2; + } + } else { + if (thumbSize.height < rangeContentBoxSize.height) { + nscoord traversableDistance = + rangeContentBoxSize.height - thumbSize.height; + newPosition.x += (rangeContentBoxSize.width - thumbSize.width) / 2; + if (IsUpwards()) { + newPosition.y += NSToCoordRound((1.0 - fraction) * traversableDistance); + } else { + newPosition.y += NSToCoordRound(fraction * traversableDistance); + } + } + } + aThumbFrame->SetPosition(newPosition); +} + +void nsRangeFrame::DoUpdateRangeProgressFrame(nsIFrame* aRangeProgressFrame, + const nsSize& aRangeSize) { + MOZ_ASSERT(aRangeProgressFrame); + + // The idea here is that we want to position the ::-moz-range-progress + // pseudo-element so that the center line running along its length is on the + // corresponding center line of the nsRangeFrame's content box. In the other + // dimension, we align the "start" edge of the ::-moz-range-progress + // pseudo-element's border-box with the corresponding edge of the + // nsRangeFrame's content box, and we size the progress element's border-box + // to have a length of GetValueAsFractionOfRange() times the nsRangeFrame's + // content-box size. + + nsMargin borderAndPadding = GetUsedBorderAndPadding(); + nsSize progSize = aRangeProgressFrame->GetSize(); + nsRect progRect(borderAndPadding.left, borderAndPadding.top, progSize.width, + progSize.height); + + nsSize rangeContentBoxSize(aRangeSize); + rangeContentBoxSize.width -= borderAndPadding.LeftRight(); + rangeContentBoxSize.height -= borderAndPadding.TopBottom(); + + double fraction = GetValueAsFractionOfRange(); + MOZ_ASSERT(fraction >= 0.0 && fraction <= 1.0); + + if (IsHorizontal()) { + nscoord progLength = NSToCoordRound(fraction * rangeContentBoxSize.width); + if (IsRightToLeft()) { + progRect.x += rangeContentBoxSize.width - progLength; + } + progRect.y += (rangeContentBoxSize.height - progSize.height) / 2; + progRect.width = progLength; + } else { + nscoord progLength = NSToCoordRound(fraction * rangeContentBoxSize.height); + progRect.x += (rangeContentBoxSize.width - progSize.width) / 2; + if (IsUpwards()) { + progRect.y += rangeContentBoxSize.height - progLength; + } + progRect.height = progLength; + } + aRangeProgressFrame->SetRect(progRect); +} + +nsresult nsRangeFrame::AttributeChanged(int32_t aNameSpaceID, + nsAtom* aAttribute, int32_t aModType) { + NS_ASSERTION(mTrackDiv, "The track div must exist!"); + NS_ASSERTION(mThumbDiv, "The thumb div must exist!"); + + if (aNameSpaceID == kNameSpaceID_None) { + if (aAttribute == nsGkAtoms::value || aAttribute == nsGkAtoms::min || + aAttribute == nsGkAtoms::max || aAttribute == nsGkAtoms::step) { + // We want to update the position of the thumb, except in one special + // case: If the value attribute is being set, it is possible that we are + // in the middle of a type change away from type=range, under the + // SetAttr(..., nsGkAtoms::value, ...) call in HTMLInputElement:: + // HandleTypeChange. In that case the HTMLInputElement's type will + // already have changed, and if we call UpdateForValueChange() + // we'll fail the asserts under that call that check the type of our + // HTMLInputElement. Given that we're changing away from being a range + // and this frame will shortly be destroyed, there's no point in calling + // UpdateForValueChange() anyway. + MOZ_ASSERT(mContent->IsHTMLElement(nsGkAtoms::input), "bad cast"); + bool typeIsRange = + static_cast<dom::HTMLInputElement*>(GetContent())->ControlType() == + FormControlType::InputRange; + // If script changed the <input>'s type before setting these attributes + // then we don't need to do anything since we are going to be reframed. + if (typeIsRange) { + UpdateForValueChange(); + } + } else if (aAttribute == nsGkAtoms::orient) { + PresShell()->FrameNeedsReflow(this, IntrinsicDirty::None, + NS_FRAME_IS_DIRTY); + } else if (aAttribute == nsGkAtoms::list_) { + const bool isRemoval = aModType == MutationEvent_Binding::REMOVAL; + if (mListMutationObserver) { + mListMutationObserver->Detach(); + if (isRemoval) { + mListMutationObserver = nullptr; + } else { + mListMutationObserver->Attach(); + } + } else if (!isRemoval) { + mListMutationObserver = new ListMutationObserver(*this, true); + } + } + } + + return nsContainerFrame::AttributeChanged(aNameSpaceID, aAttribute, aModType); +} + +nscoord nsRangeFrame::AutoCrossSize(Length aEm) { + nscoord minCrossSize(0); + if (IsThemed()) { + nsPresContext* pc = PresContext(); + LayoutDeviceIntSize size = pc->Theme()->GetMinimumWidgetSize( + pc, this, StyleAppearance::RangeThumb); + minCrossSize = + pc->DevPixelsToAppUnits(IsHorizontal() ? size.height : size.width); + } + return std::max(minCrossSize, aEm.ScaledBy(CROSS_AXIS_EM_SIZE).ToAppUnits()); +} + +static mozilla::Length OneEm(nsRangeFrame* aFrame) { + return aFrame->StyleFont()->mFont.size.ScaledBy( + nsLayoutUtils::FontSizeInflationFor(aFrame)); +} + +LogicalSize nsRangeFrame::ComputeAutoSize( + gfxContext* aRenderingContext, WritingMode aWM, const LogicalSize& aCBSize, + nscoord aAvailableISize, const LogicalSize& aMargin, + const LogicalSize& aBorderPadding, const StyleSizeOverrides& aSizeOverrides, + ComputeSizeFlags aFlags) { + bool isInlineOriented = IsInlineOriented(); + auto em = OneEm(this); + + const WritingMode wm = GetWritingMode(); + LogicalSize autoSize(wm); + if (isInlineOriented) { + autoSize.ISize(wm) = em.ScaledBy(MAIN_AXIS_EM_SIZE).ToAppUnits(); + autoSize.BSize(wm) = AutoCrossSize(em); + } else { + autoSize.ISize(wm) = AutoCrossSize(em); + autoSize.BSize(wm) = em.ScaledBy(MAIN_AXIS_EM_SIZE).ToAppUnits(); + } + + return autoSize.ConvertTo(aWM, wm); +} + +nscoord nsRangeFrame::GetMinISize(gfxContext* aRenderingContext) { + const auto* pos = StylePosition(); + auto wm = GetWritingMode(); + if (pos->ISize(wm).HasPercent()) { + // https://drafts.csswg.org/css-sizing-3/#percentage-sizing + // https://drafts.csswg.org/css-sizing-3/#min-content-zero + return nsLayoutUtils::ResolveToLength<true>( + pos->ISize(wm).AsLengthPercentage(), nscoord(0)); + } + return GetPrefISize(aRenderingContext); +} + +nscoord nsRangeFrame::GetPrefISize(gfxContext* aRenderingContext) { + auto em = OneEm(this); + if (IsInlineOriented()) { + return em.ScaledBy(MAIN_AXIS_EM_SIZE).ToAppUnits(); + } + return AutoCrossSize(em); +} + +bool nsRangeFrame::IsHorizontal() const { + dom::HTMLInputElement* element = + static_cast<dom::HTMLInputElement*>(GetContent()); + return element->AttrValueIs(kNameSpaceID_None, nsGkAtoms::orient, + nsGkAtoms::horizontal, eCaseMatters) || + (!element->AttrValueIs(kNameSpaceID_None, nsGkAtoms::orient, + nsGkAtoms::vertical, eCaseMatters) && + GetWritingMode().IsVertical() == + element->AttrValueIs(kNameSpaceID_None, nsGkAtoms::orient, + nsGkAtoms::block, eCaseMatters)); +} + +double nsRangeFrame::GetMin() const { + return static_cast<dom::HTMLInputElement*>(GetContent()) + ->GetMinimum() + .toDouble(); +} + +double nsRangeFrame::GetMax() const { + return static_cast<dom::HTMLInputElement*>(GetContent()) + ->GetMaximum() + .toDouble(); +} + +double nsRangeFrame::GetValue() const { + return static_cast<dom::HTMLInputElement*>(GetContent()) + ->GetValueAsDecimal() + .toDouble(); +} + +bool nsRangeFrame::ShouldUseNativeStyle() const { + nsIFrame* trackFrame = mTrackDiv->GetPrimaryFrame(); + nsIFrame* progressFrame = mProgressDiv->GetPrimaryFrame(); + nsIFrame* thumbFrame = mThumbDiv->GetPrimaryFrame(); + + return StyleDisplay()->EffectiveAppearance() == StyleAppearance::Range && + trackFrame && + !trackFrame->Style()->HasAuthorSpecifiedBorderOrBackground() && + progressFrame && + !progressFrame->Style()->HasAuthorSpecifiedBorderOrBackground() && + thumbFrame && + !thumbFrame->Style()->HasAuthorSpecifiedBorderOrBackground(); +} |