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Mypal/layout/forms/nsRangeFrame.cpp

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/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* 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 "nsContentCreatorFunctions.h"
#include "nsContentList.h"
#include "nsContentUtils.h"
#include "nsCSSPseudoElements.h"
#include "nsCSSRendering.h"
#include "nsFormControlFrame.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 "nsRenderingContext.h"
#include "mozilla/dom/Element.h"
#include "mozilla/StyleSetHandle.h"
#include "mozilla/StyleSetHandleInlines.h"
#include "nsThemeConstants.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, nsStyleContext* aContext)
{
return new (aPresShell) nsRangeFrame(aContext);
}
nsRangeFrame::nsRangeFrame(nsStyleContext* aContext)
: nsContainerFrame(aContext)
{
}
nsRangeFrame::~nsRangeFrame()
{
#ifdef DEBUG
if (mOuterFocusStyle) {
mOuterFocusStyle->FrameRelease();
}
#endif
}
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);
StyleSetHandle styleSet = PresContext()->StyleSet();
mOuterFocusStyle =
styleSet->ProbePseudoElementStyle(aContent->AsElement(),
CSSPseudoElementType::mozFocusOuter,
StyleContext());
return nsContainerFrame::Init(aContent, aParent, aPrevInFlow);
}
void
nsRangeFrame::DestroyFrom(nsIFrame* aDestructRoot)
{
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);
nsFormControlFrame::RegUnRegAccessKey(static_cast<nsIFrame*>(this), false);
nsContentUtils::DestroyAnonymousContent(&mTrackDiv);
nsContentUtils::DestroyAnonymousContent(&mProgressDiv);
nsContentUtils::DestroyAnonymousContent(&mThumbDiv);
nsContainerFrame::DestroyFrom(aDestructRoot);
}
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 : 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) override;
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) override;
virtual void Paint(nsDisplayListBuilder* aBuilder, nsRenderingContext* 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)
{
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)
{
*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:
nsStyleContext* styleContext =
static_cast<nsRangeFrame*>(mFrame)->mOuterFocusStyle;
MOZ_ASSERT(styleContext, "We only exist if mOuterFocusStyle is non-null");
rect.Inflate(styleContext->StyleBorder()->GetComputedBorder());
return rect;
}
void
nsDisplayRangeFocusRing::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx)
{
bool unused;
nsStyleContext* styleContext =
static_cast<nsRangeFrame*>(mFrame)->mOuterFocusStyle;
MOZ_ASSERT(styleContext, "We only exist if mOuterFocusStyle is non-null");
PaintBorderFlags flags = aBuilder->ShouldSyncDecodeImages()
? PaintBorderFlags::SYNC_DECODE_IMAGES
: PaintBorderFlags();
DrawResult result =
nsCSSRendering::PaintBorder(mFrame->PresContext(), *aCtx, mFrame,
mVisibleRect, GetBounds(aBuilder, &unused),
styleContext, flags);
nsDisplayItemGenericImageGeometry::UpdateDrawResult(this, result);
}
void
nsRangeFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists)
{
if (IsThemed()) {
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;
}
const nsStyleDisplay *disp = StyleDisplay();
if (IsThemed(disp) &&
PresContext()->GetTheme()->ThemeDrawsFocusForWidget(disp->mAppearance)) {
return; // the native theme displays its own visual indication of focus
}
aLists.Content()->AppendNewToTop(
new (aBuilder) 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);
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) {
nsFormControlFrame::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);
aStatus = NS_FRAME_COMPLETE;
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(NS_FRAME_IS_FULLY_COMPLETE(frameStatus),
"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(NS_FRAME_IS_FULLY_COMPLETE(frameStatus),
"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(NS_FRAME_IS_FULLY_COMPLETE(frameStatus),
"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*>(mContent);
MOZ_ASSERT(input->GetType() == 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) {
MOZ_ASSERT(value == minimum, "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*>(mContent);
MOZ_ASSERT(input->GetType() == 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*>(mContent)->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, NS_THEME_RANGE_THUMB, &size,
&notUsedCanOverride);
thumbSize.width = presContext->DevPixelsToAppUnits(size.width);
thumbSize.height = presContext->DevPixelsToAppUnits(size.height);
MOZ_ASSERT(thumbSize.width > 0 && thumbSize.height > 0);
} 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(PresContext()->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,
nsIAtom* 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*>(mContent)->GetType() ==
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) {
PresContext()->PresShell()->FrameNeedsReflow(this, nsIPresShell::eResize,
NS_FRAME_IS_DIRTY);
}
}
return nsContainerFrame::AttributeChanged(aNameSpaceID, aAttribute, aModType);
}
LogicalSize
nsRangeFrame::ComputeAutoSize(nsRenderingContext* 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(nsRenderingContext *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(nsRenderingContext *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*>(mContent);
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*>(mContent)->GetMinimum().toDouble();
}
double
nsRangeFrame::GetMax() const
{
return static_cast<dom::HTMLInputElement*>(mContent)->GetMaximum().toDouble();
}
double
nsRangeFrame::GetValue() const
{
return static_cast<dom::HTMLInputElement*>(mContent)->GetValueAsDecimal().toDouble();
}
nsIAtom*
nsRangeFrame::GetType() const
{
return nsGkAtoms::rangeFrame;
}
#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 == NS_THEME_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);
}
Element*
nsRangeFrame::GetPseudoElement(CSSPseudoElementType aType)
{
if (aType == CSSPseudoElementType::mozRangeTrack) {
return mTrackDiv;
}
if (aType == CSSPseudoElementType::mozRangeThumb) {
return mThumbDiv;
}
if (aType == CSSPseudoElementType::mozRangeProgress) {
return mProgressDiv;
}
return nsContainerFrame::GetPseudoElement(aType);
}
nsStyleContext*
nsRangeFrame::GetAdditionalStyleContext(int32_t aIndex) const
{
// We only implement this so that SetAdditionalStyleContext 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::SetAdditionalStyleContext(int32_t aIndex,
nsStyleContext* aStyleContext)
{
MOZ_ASSERT(aIndex == 0,
"GetAdditionalStyleContext is handling other indexes?");
#ifdef DEBUG
if (mOuterFocusStyle) {
mOuterFocusStyle->FrameRelease();
}
#endif
// The -moz-focus-outer pseudo-element's style has changed.
mOuterFocusStyle = aStyleContext;
#ifdef DEBUG
if (mOuterFocusStyle) {
mOuterFocusStyle->FrameAddRef();
}
#endif
}
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