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fune/layout/forms/nsRangeFrame.cpp
Bryce Van Dyk 2f64c0934b Bug 893331 - Relax assert checking if value is within range for nsRangeFrame. r=TYLin 
GetValueAsFractionOfRange asserts that input == minimum if the range has maximum
<= minimum. This assert is sane at face value, but floating point rounding
issues can cause it to be triggered when input is essentially minimum.

This changeset relaxes the assertion to check the input is within an epsilon
value of minimum.

Differential Revision: https://phabricator.services.mozilla.com/D10648

--HG--
extra : moz-landing-system : lando
2018-11-02 21:30:49 +00:00

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/* -*- 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 "mozilla/EventStates.h"
#include "mozilla/TouchEvents.h"
#include "gfxContext.h"
#include "nsContentCreatorFunctions.h"
#include "nsCSSPseudoElements.h"
#include "nsCSSRendering.h"
#include "nsCheckboxRadioFrame.h"
#include "nsIContent.h"
#include "nsIDocument.h"
#include "nsNameSpaceManager.h"
#include "nsIPresShell.h"
#include "nsGkAtoms.h"
#include "mozilla/dom/HTMLInputElement.h"
#include "nsPresContext.h"
#include "nsNodeInfoManager.h"
#include "mozilla/dom/Element.h"
#include "mozilla/ServoStyleSet.h"
#include "nsStyleConsts.h"
#ifdef ACCESSIBILITY
#include "nsAccessibilityService.h"
#endif
#define LONG_SIDE_TO_SHORT_SIDE_RATIO 10
using namespace mozilla;
using namespace mozilla::dom;
using namespace mozilla::image;
NS_IMPL_ISUPPORTS(nsRangeFrame::DummyTouchListener, nsIDOMEventListener)
nsIFrame*
NS_NewRangeFrame(nsIPresShell* aPresShell, ComputedStyle* aStyle)
{
return new (aPresShell) nsRangeFrame(aStyle);
}
nsRangeFrame::nsRangeFrame(ComputedStyle* aStyle)
: nsContainerFrame(aStyle, kClassID)
{
}
nsRangeFrame::~nsRangeFrame()
{
}
NS_IMPL_FRAMEARENA_HELPERS(nsRangeFrame)
NS_QUERYFRAME_HEAD(nsRangeFrame)
NS_QUERYFRAME_ENTRY(nsRangeFrame)
NS_QUERYFRAME_ENTRY(nsIAnonymousContentCreator)
NS_QUERYFRAME_TAIL_INHERITING(nsContainerFrame)
void
nsRangeFrame::Init(nsIContent* aContent,
nsContainerFrame* aParent,
nsIFrame* aPrevInFlow)
{
// With APZ enabled, touch events may be handled directly by the APZC code
// if the APZ knows that there is no content interested in the touch event.
// The range input element *is* interested in touch events, but doesn't use
// the usual mechanism (i.e. registering an event listener) to handle touch
// input. Instead, we do it here so that the APZ finds out about it, and
// makes sure to wait for content to run handlers before handling the touch
// input itself.
if (!mDummyTouchListener) {
mDummyTouchListener = new DummyTouchListener();
}
aContent->AddEventListener(NS_LITERAL_STRING("touchstart"), mDummyTouchListener, false);
ServoStyleSet* styleSet = PresContext()->StyleSet();
mOuterFocusStyle =
styleSet->ProbePseudoElementStyle(*aContent->AsElement(),
CSSPseudoElementType::mozFocusOuter,
Style());
return nsContainerFrame::Init(aContent, aParent, aPrevInFlow);
}
void
nsRangeFrame::DestroyFrom(nsIFrame* aDestructRoot, PostDestroyData& aPostDestroyData)
{
NS_ASSERTION(!GetPrevContinuation() && !GetNextContinuation(),
"nsRangeFrame should not have continuations; if it does we "
"need to call RegUnregAccessKey only for the first.");
mContent->RemoveEventListener(NS_LITERAL_STRING("touchstart"), mDummyTouchListener, false);
nsCheckboxRadioFrame::RegUnRegAccessKey(static_cast<nsIFrame*>(this), false);
aPostDestroyData.AddAnonymousContent(mTrackDiv.forget());
aPostDestroyData.AddAnonymousContent(mProgressDiv.forget());
aPostDestroyData.AddAnonymousContent(mThumbDiv.forget());
nsContainerFrame::DestroyFrom(aDestructRoot, aPostDestroyData);
}
nsresult
nsRangeFrame::MakeAnonymousDiv(Element** aResult,
CSSPseudoElementType aPseudoType,
nsTArray<ContentInfo>& aElements)
{
nsCOMPtr<nsIDocument> doc = mContent->GetComposedDoc();
RefPtr<Element> resultElement = doc->CreateHTMLElement(nsGkAtoms::div);
// Associate the pseudo-element with the anonymous child.
resultElement->SetPseudoElementType(aPseudoType);
if (!aElements.AppendElement(resultElement)) {
return NS_ERROR_OUT_OF_MEMORY;
}
resultElement.forget(aResult);
return NS_OK;
}
nsresult
nsRangeFrame::CreateAnonymousContent(nsTArray<ContentInfo>& aElements)
{
nsresult rv;
// Create the ::-moz-range-track pseuto-element (a div):
rv = MakeAnonymousDiv(getter_AddRefs(mTrackDiv),
CSSPseudoElementType::mozRangeTrack,
aElements);
NS_ENSURE_SUCCESS(rv, rv);
// Create the ::-moz-range-progress pseudo-element (a div):
rv = MakeAnonymousDiv(getter_AddRefs(mProgressDiv),
CSSPseudoElementType::mozRangeProgress,
aElements);
NS_ENSURE_SUCCESS(rv, rv);
// Create the ::-moz-range-thumb pseudo-element (a div):
rv = MakeAnonymousDiv(getter_AddRefs(mThumbDiv),
CSSPseudoElementType::mozRangeThumb,
aElements);
return rv;
}
void
nsRangeFrame::AppendAnonymousContentTo(nsTArray<nsIContent*>& aElements,
uint32_t aFilter)
{
if (mTrackDiv) {
aElements.AppendElement(mTrackDiv);
}
if (mProgressDiv) {
aElements.AppendElement(mProgressDiv);
}
if (mThumbDiv) {
aElements.AppendElement(mThumbDiv);
}
}
class nsDisplayRangeFocusRing final : public nsDisplayItem
{
public:
nsDisplayRangeFocusRing(nsDisplayListBuilder* aBuilder, nsIFrame* aFrame)
: nsDisplayItem(aBuilder, aFrame) {
MOZ_COUNT_CTOR(nsDisplayRangeFocusRing);
}
#ifdef NS_BUILD_REFCNT_LOGGING
virtual ~nsDisplayRangeFocusRing() {
MOZ_COUNT_DTOR(nsDisplayRangeFocusRing);
}
#endif
nsDisplayItemGeometry* AllocateGeometry(nsDisplayListBuilder* aBuilder) override;
void ComputeInvalidationRegion(nsDisplayListBuilder* aBuilder,
const nsDisplayItemGeometry* aGeometry,
nsRegion *aInvalidRegion) const override;
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder,
bool* aSnap) const override;
virtual void Paint(nsDisplayListBuilder* aBuilder, gfxContext* aCtx) override;
NS_DISPLAY_DECL_NAME("RangeFocusRing", TYPE_RANGE_FOCUS_RING)
};
nsDisplayItemGeometry*
nsDisplayRangeFocusRing::AllocateGeometry(nsDisplayListBuilder* aBuilder)
{
return new nsDisplayItemGenericImageGeometry(this, aBuilder);
}
void
nsDisplayRangeFocusRing::ComputeInvalidationRegion(nsDisplayListBuilder* aBuilder,
const nsDisplayItemGeometry* aGeometry,
nsRegion* aInvalidRegion) const
{
auto geometry =
static_cast<const nsDisplayItemGenericImageGeometry*>(aGeometry);
if (aBuilder->ShouldSyncDecodeImages() &&
geometry->ShouldInvalidateToSyncDecodeImages()) {
bool snap;
aInvalidRegion->Or(*aInvalidRegion, GetBounds(aBuilder, &snap));
}
nsDisplayItem::ComputeInvalidationRegion(aBuilder, aGeometry, aInvalidRegion);
}
nsRect
nsDisplayRangeFocusRing::GetBounds(nsDisplayListBuilder* aBuilder,
bool* aSnap) const
{
*aSnap = false;
nsRect rect(ToReferenceFrame(), Frame()->GetSize());
// We want to paint as if specifying a border for ::-moz-focus-outer
// specifies an outline for our frame, so inflate by the border widths:
ComputedStyle* computedStyle =
static_cast<nsRangeFrame*>(mFrame)->mOuterFocusStyle;
MOZ_ASSERT(computedStyle, "We only exist if mOuterFocusStyle is non-null");
rect.Inflate(computedStyle->StyleBorder()->GetComputedBorder());
return rect;
}
void
nsDisplayRangeFocusRing::Paint(nsDisplayListBuilder* aBuilder,
gfxContext* aCtx)
{
bool unused;
ComputedStyle* computedStyle =
static_cast<nsRangeFrame*>(mFrame)->mOuterFocusStyle;
MOZ_ASSERT(computedStyle, "We only exist if mOuterFocusStyle is non-null");
PaintBorderFlags flags = aBuilder->ShouldSyncDecodeImages()
? PaintBorderFlags::SYNC_DECODE_IMAGES
: PaintBorderFlags();
ImgDrawResult result =
nsCSSRendering::PaintBorder(mFrame->PresContext(), *aCtx, mFrame,
GetPaintRect(), GetBounds(aBuilder, &unused),
computedStyle, flags);
nsDisplayItemGenericImageGeometry::UpdateDrawResult(this, result);
}
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.
nsIFrame* thumb = mThumbDiv->GetPrimaryFrame();
if (thumb) {
nsDisplayListSet set(aLists, aLists.Content());
BuildDisplayListForChild(aBuilder, thumb, set, DISPLAY_CHILD_INLINE);
}
} else {
BuildDisplayListForInline(aBuilder, aLists);
}
// Draw a focus outline if appropriate:
if (!aBuilder->IsForPainting() ||
!IsVisibleForPainting(aBuilder)) {
// we don't want the focus ring item for hit-testing or if the item isn't
// in the area being [re]painted
return;
}
EventStates eventStates = mContent->AsElement()->State();
if (eventStates.HasState(NS_EVENT_STATE_DISABLED) ||
!eventStates.HasState(NS_EVENT_STATE_FOCUSRING)) {
return; // can't have focus or doesn't match :-moz-focusring
}
if (!mOuterFocusStyle ||
!mOuterFocusStyle->StyleBorder()->HasBorder()) {
// no ::-moz-focus-outer specified border (how style specifies a focus ring
// for range)
return;
}
if (IsThemed(disp) &&
PresContext()->GetTheme()->ThemeDrawsFocusForWidget(disp->mAppearance)) {
return; // the native theme displays its own visual indication of focus
}
aLists.Content()->AppendToTop(
MakeDisplayItem<nsDisplayRangeFocusRing>(aBuilder, this));
}
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.");
if (mState & NS_FRAME_FIRST_REFLOW) {
nsCheckboxRadioFrame::RegUnRegAccessKey(this, true);
}
WritingMode wm = aReflowInput.GetWritingMode();
nscoord computedBSize = aReflowInput.ComputedBSize();
if (computedBSize == NS_AUTOHEIGHT) {
computedBSize = 0;
}
LogicalSize
finalSize(wm,
aReflowInput.ComputedISize() +
aReflowInput.ComputedLogicalBorderPadding().IStartEnd(wm),
computedBSize +
aReflowInput.ComputedLogicalBorderPadding().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.");
NS_FRAME_SET_TRUNCATION(aStatus, aReflowInput, aDesiredSize);
}
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_AUTOHEIGHT) {
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, 0, frameStatus);
MOZ_ASSERT(frameStatus.IsFullyComplete(),
"We gave our child unconstrained height, so it should be complete");
FinishReflowChild(trackFrame, aPresContext, trackDesiredSize,
&trackReflowInput, trackX, trackY, 0);
}
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, 0, frameStatus);
MOZ_ASSERT(frameStatus.IsFullyComplete(),
"We gave our child unconstrained height, so it should be complete");
FinishReflowChild(thumbFrame, aPresContext, thumbDesiredSize,
&thumbReflowInput, 0, 0, 0);
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,
0, frameStatus);
MOZ_ASSERT(frameStatus.IsFullyComplete(),
"We gave our child unconstrained height, so it should be complete");
FinishReflowChild(rangeProgressFrame, aPresContext,
progressDesiredSize, &progressReflowInput, 0, 0, 0);
DoUpdateRangeProgressFrame(rangeProgressFrame, nsSize(aDesiredSize.Width(),
aDesiredSize.Height()));
}
}
#ifdef ACCESSIBILITY
a11y::AccType
nsRangeFrame::AccessibleType()
{
return a11y::eHTMLRangeType;
}
#endif
double
nsRangeFrame::GetValueAsFractionOfRange()
{
MOZ_ASSERT(mContent->IsHTMLElement(nsGkAtoms::input), "bad cast");
dom::HTMLInputElement* input = static_cast<dom::HTMLInputElement*>(GetContent());
MOZ_ASSERT(input->ControlType() == NS_FORM_INPUT_RANGE);
Decimal value = input->GetValueAsDecimal();
Decimal minimum = input->GetMinimum();
Decimal maximum = input->GetMaximum();
MOZ_ASSERT(value.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((value - minimum).abs().toDouble() <
std::numeric_limits<float>::epsilon(),
"Unsanitized value");
return 0.0;
}
MOZ_ASSERT(value >= minimum && value <= maximum, "Unsanitized value");
return ((value - 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() == NS_FORM_INPUT_RANGE);
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, 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 *presContext = PresContext();
bool notUsedCanOverride;
LayoutDeviceIntSize size;
presContext->GetTheme()->
GetMinimumWidgetSize(presContext, this, StyleAppearance::RangeThumb, &size,
&notUsedCanOverride);
thumbSize.width = presContext->DevPixelsToAppUnits(size.width);
thumbSize.height = presContext->DevPixelsToAppUnits(size.height);
// 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(1) - Decimal(posOfPoint - posAtStart) / Decimal(traversableDistance);
}
MOZ_ASSERT(fraction >= Decimal(0) && fraction <= Decimal(1));
return minimum + fraction * range;
}
void
nsRangeFrame::UpdateForValueChange()
{
if (NS_SUBTREE_DIRTY(this)) {
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
nsAccessibilityService* accService = nsIPresShell::AccService();
if (accService) {
accService->RangeValueChanged(PresShell(), mContent);
}
#endif
SchedulePaint();
}
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;
newPosition.y += NSToCoordRound((1.0 - 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;
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() ==
NS_FORM_INPUT_RANGE;
// 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, nsIPresShell::eResize,
NS_FRAME_IS_DIRTY);
}
}
return nsContainerFrame::AttributeChanged(aNameSpaceID, aAttribute, aModType);
}
LogicalSize
nsRangeFrame::ComputeAutoSize(gfxContext* aRenderingContext,
WritingMode aWM,
const LogicalSize& aCBSize,
nscoord aAvailableISize,
const LogicalSize& aMargin,
const LogicalSize& aBorder,
const LogicalSize& aPadding,
ComputeSizeFlags aFlags)
{
nscoord oneEm = NSToCoordRound(StyleFont()->mFont.size *
nsLayoutUtils::FontSizeInflationFor(this)); // 1em
bool isInlineOriented = IsInlineOriented();
const WritingMode wm = GetWritingMode();
LogicalSize autoSize(wm);
// nsFrame::ComputeSize calls GetMinimumWidgetSize to prevent us from being
// given too small a size when we're natively themed. If we're themed, we set
// our "thickness" dimension to zero below and rely on that
// GetMinimumWidgetSize check to correct that dimension to the natural
// thickness of a slider in the current theme.
if (isInlineOriented) {
autoSize.ISize(wm) = LONG_SIDE_TO_SHORT_SIDE_RATIO * oneEm;
autoSize.BSize(wm) = IsThemed() ? 0 : oneEm;
} else {
autoSize.ISize(wm) = IsThemed() ? 0 : oneEm;
autoSize.BSize(wm) = LONG_SIDE_TO_SHORT_SIDE_RATIO * oneEm;
}
return autoSize.ConvertTo(aWM, wm);
}
nscoord
nsRangeFrame::GetMinISize(gfxContext *aRenderingContext)
{
// nsFrame::ComputeSize calls GetMinimumWidgetSize to prevent us from being
// given too small a size when we're natively themed. If we aren't native
// themed, we don't mind how small we're sized.
return nscoord(0);
}
nscoord
nsRangeFrame::GetPrefISize(gfxContext *aRenderingContext)
{
bool isInline = IsInlineOriented();
if (!isInline && IsThemed()) {
// nsFrame::ComputeSize calls GetMinimumWidgetSize to prevent us from being
// given too small a size when we're natively themed. We return zero and
// depend on that correction to get our "natural" width when we're a
// vertical slider.
return 0;
}
nscoord prefISize = NSToCoordRound(StyleFont()->mFont.size *
nsLayoutUtils::FontSizeInflationFor(this)); // 1em
if (isInline) {
prefISize *= LONG_SIDE_TO_SHORT_SIDE_RATIO;
}
return prefISize;
}
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();
}
#define STYLES_DISABLING_NATIVE_THEMING \
NS_AUTHOR_SPECIFIED_BACKGROUND | \
NS_AUTHOR_SPECIFIED_PADDING | \
NS_AUTHOR_SPECIFIED_BORDER
bool
nsRangeFrame::ShouldUseNativeStyle() const
{
nsIFrame* trackFrame = mTrackDiv->GetPrimaryFrame();
nsIFrame* progressFrame = mProgressDiv->GetPrimaryFrame();
nsIFrame* thumbFrame = mThumbDiv->GetPrimaryFrame();
return (StyleDisplay()->mAppearance == StyleAppearance::Range) &&
!PresContext()->HasAuthorSpecifiedRules(this,
(NS_AUTHOR_SPECIFIED_BORDER |
NS_AUTHOR_SPECIFIED_BACKGROUND)) &&
trackFrame &&
!PresContext()->HasAuthorSpecifiedRules(trackFrame,
STYLES_DISABLING_NATIVE_THEMING) &&
progressFrame &&
!PresContext()->HasAuthorSpecifiedRules(progressFrame,
STYLES_DISABLING_NATIVE_THEMING) &&
thumbFrame &&
!PresContext()->HasAuthorSpecifiedRules(thumbFrame,
STYLES_DISABLING_NATIVE_THEMING);
}
ComputedStyle*
nsRangeFrame::GetAdditionalComputedStyle(int32_t aIndex) const
{
// We only implement this so that SetAdditionalComputedStyle will be
// called if style changes that would change the -moz-focus-outer
// pseudo-element have occurred.
if (aIndex != 0) {
return nullptr;
}
return mOuterFocusStyle;
}
void
nsRangeFrame::SetAdditionalComputedStyle(int32_t aIndex,
ComputedStyle* aComputedStyle)
{
MOZ_ASSERT(aIndex == 0,
"GetAdditionalComputedStyle is handling other indexes?");
// The -moz-focus-outer pseudo-element's style has changed.
mOuterFocusStyle = aComputedStyle;
}
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