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gecko-dev/layout/forms/nsRangeFrame.cpp
Wes Kocher 42253715d7 Backed out 11 changesets (bug 1008917) for apparently introducing an intermittent failure of B2G Crashtest-2 on a CLOSED TREE 
Backed out changeset e2ab653f688a (bug 1008917)
Backed out changeset b52154d8d900 (bug 1008917)
Backed out changeset 2ab5b01da4de (bug 1008917)
Backed out changeset f7a38df1d44f (bug 1008917)
Backed out changeset 80304bb9a572 (bug 1008917)
Backed out changeset 10ed89a302e9 (bug 1008917)
Backed out changeset 161c41991d46 (bug 1008917)
Backed out changeset 25b2475d2368 (bug 1008917)
Backed out changeset b8000b31277c (bug 1008917)
Backed out changeset 9afa5e7715e1 (bug 1008917)
Backed out changeset 5c380c21351f (bug 1008917)
2014-05-12 15:47:41 -07:00

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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 "nsCSSRendering.h"
#include "nsFormControlFrame.h"
#include "nsIContent.h"
#include "nsIDocument.h"
#include "nsNameSpaceManager.h"
#include "nsINodeInfo.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 "nsStyleSet.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;
nsIFrame*
NS_NewRangeFrame(nsIPresShell* aPresShell, nsStyleContext* aContext)
{
return new (aPresShell) nsRangeFrame(aContext);
}
nsRangeFrame::nsRangeFrame(nsStyleContext* aContext)
: nsContainerFrame(aContext)
{
}
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,
nsIFrame* aParent,
nsIFrame* aPrevInFlow)
{
// B2G's AsyncPanZoomController::ReceiveInputEvent handles touch events
// without checking whether the out-of-process document that it controls
// will handle them, unless it has been told that the document might do so.
// This is for perf reasons, otherwise it has to wait for the event to be
// round-tripped to the other process and back, delaying panning, etc.
// We must call SetHasTouchEventListeners() in order to get APZC to wait
// until the event has been round-tripped and check whether it has been
// handled, otherwise B2G will end up panning the document when the user
// tries to drag our thumb.
//
nsIPresShell* presShell = PresContext()->GetPresShell();
if (presShell) {
nsIDocument* document = presShell->GetDocument();
if (document) {
nsPIDOMWindow* innerWin = document->GetInnerWindow();
if (innerWin) {
innerWin->SetHasTouchEventListeners();
}
}
}
nsStyleSet *styleSet = PresContext()->StyleSet();
mOuterFocusStyle =
styleSet->ProbePseudoElementStyle(aContent->AsElement(),
nsCSSPseudoElements::ePseudo_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.");
nsFormControlFrame::RegUnRegAccessKey(static_cast<nsIFrame*>(this), false);
nsContentUtils::DestroyAnonymousContent(&mTrackDiv);
nsContentUtils::DestroyAnonymousContent(&mProgressDiv);
nsContentUtils::DestroyAnonymousContent(&mThumbDiv);
nsContainerFrame::DestroyFrom(aDestructRoot);
}
nsresult
nsRangeFrame::MakeAnonymousDiv(Element** aResult,
nsCSSPseudoElements::Type aPseudoType,
nsTArray<ContentInfo>& aElements)
{
nsCOMPtr<nsIDocument> doc = mContent->GetDocument();
nsRefPtr<Element> resultElement = doc->CreateHTMLElement(nsGkAtoms::div);
// Associate the pseudo-element with the anonymous child.
nsRefPtr<nsStyleContext> newStyleContext =
PresContext()->StyleSet()->ResolvePseudoElementStyle(mContent->AsElement(),
aPseudoType,
StyleContext(),
resultElement);
if (!aElements.AppendElement(ContentInfo(resultElement, newStyleContext))) {
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),
nsCSSPseudoElements::ePseudo_mozRangeTrack,
aElements);
NS_ENSURE_SUCCESS(rv, rv);
// Create the ::-moz-range-progress pseudo-element (a div):
rv = MakeAnonymousDiv(getter_AddRefs(mProgressDiv),
nsCSSPseudoElements::ePseudo_mozRangeProgress,
aElements);
NS_ENSURE_SUCCESS(rv, rv);
// Create the ::-moz-range-thumb pseudo-element (a div):
rv = MakeAnonymousDiv(getter_AddRefs(mThumbDiv),
nsCSSPseudoElements::ePseudo_mozRangeThumb,
aElements);
return rv;
}
void
nsRangeFrame::AppendAnonymousContentTo(nsBaseContentList& aElements,
uint32_t aFilter)
{
aElements.MaybeAppendElement(mTrackDiv);
aElements.MaybeAppendElement(mProgressDiv);
aElements.MaybeAppendElement(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
virtual nsRect GetBounds(nsDisplayListBuilder* aBuilder, bool* aSnap) MOZ_OVERRIDE;
virtual void Paint(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx) MOZ_OVERRIDE;
NS_DISPLAY_DECL_NAME("RangeFocusRing", TYPE_OUTLINE)
};
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");
nsCSSRendering::PaintBorder(mFrame->PresContext(), *aCtx, mFrame,
mVisibleRect, GetBounds(aBuilder, &unused),
styleContext);
}
void
nsRangeFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
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, aDirtyRect, set, DISPLAY_CHILD_INLINE);
}
} else {
BuildDisplayListForInline(aBuilder, aDirtyRect, 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));
}
nsresult
nsRangeFrame::Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus)
{
DO_GLOBAL_REFLOW_COUNT("nsRangeFrame");
DISPLAY_REFLOW(aPresContext, this, aReflowState, 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);
}
nscoord computedHeight = aReflowState.ComputedHeight();
if (computedHeight == NS_AUTOHEIGHT) {
computedHeight = 0;
}
aDesiredSize.Width() = aReflowState.ComputedWidth() +
aReflowState.ComputedPhysicalBorderPadding().LeftRight();
aDesiredSize.Height() = computedHeight +
aReflowState.ComputedPhysicalBorderPadding().TopBottom();
nsresult rv =
ReflowAnonymousContent(aPresContext, aDesiredSize, aReflowState);
NS_ENSURE_SUCCESS(rv, rv);
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, aReflowState, aDesiredSize);
return NS_OK;
}
nsresult
nsRangeFrame::ReflowAnonymousContent(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState)
{
// The width/height of our content box, which is the available width/height
// for our anonymous content:
nscoord rangeFrameContentBoxWidth = aReflowState.ComputedWidth();
nscoord rangeFrameContentBoxHeight = aReflowState.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.
nsHTMLReflowState trackReflowState(aPresContext, aReflowState, trackFrame,
nsSize(aReflowState.ComputedWidth(),
NS_UNCONSTRAINEDSIZE));
// 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 -= trackReflowState.ComputedPhysicalBorderPadding().left +
trackReflowState.ComputedWidth() / 2;
trackY -= trackReflowState.ComputedPhysicalBorderPadding().top +
trackReflowState.ComputedHeight() / 2;
// Make relative to our border box instead of our content box:
trackX += aReflowState.ComputedPhysicalBorderPadding().left;
trackY += aReflowState.ComputedPhysicalBorderPadding().top;
nsReflowStatus frameStatus;
nsHTMLReflowMetrics trackDesiredSize(aReflowState);
nsresult rv = ReflowChild(trackFrame, aPresContext, trackDesiredSize,
trackReflowState, trackX, trackY, 0, frameStatus);
NS_ENSURE_SUCCESS(rv, rv);
MOZ_ASSERT(NS_FRAME_IS_FULLY_COMPLETE(frameStatus),
"We gave our child unconstrained height, so it should be complete");
rv = FinishReflowChild(trackFrame, aPresContext, trackDesiredSize,
&trackReflowState, trackX, trackY, 0);
NS_ENSURE_SUCCESS(rv, rv);
}
nsIFrame* thumbFrame = mThumbDiv->GetPrimaryFrame();
if (thumbFrame) { // display:none?
nsHTMLReflowState thumbReflowState(aPresContext, aReflowState, thumbFrame,
nsSize(aReflowState.ComputedWidth(),
NS_UNCONSTRAINEDSIZE));
// 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;
nsHTMLReflowMetrics thumbDesiredSize(aReflowState);
nsresult rv = ReflowChild(thumbFrame, aPresContext, thumbDesiredSize,
thumbReflowState, 0, 0, 0, frameStatus);
NS_ENSURE_SUCCESS(rv, rv);
MOZ_ASSERT(NS_FRAME_IS_FULLY_COMPLETE(frameStatus),
"We gave our child unconstrained height, so it should be complete");
rv = FinishReflowChild(thumbFrame, aPresContext, thumbDesiredSize,
&thumbReflowState, 0, 0, 0);
NS_ENSURE_SUCCESS(rv, rv);
DoUpdateThumbPosition(thumbFrame, nsSize(aDesiredSize.Width(),
aDesiredSize.Height()));
}
nsIFrame* rangeProgressFrame = mProgressDiv->GetPrimaryFrame();
if (rangeProgressFrame) { // display:none?
nsHTMLReflowState progressReflowState(aPresContext, aReflowState,
rangeProgressFrame,
nsSize(aReflowState.ComputedWidth(),
NS_UNCONSTRAINEDSIZE));
// 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;
nsHTMLReflowMetrics progressDesiredSize(aReflowState);
nsresult rv = ReflowChild(rangeProgressFrame, aPresContext,
progressDesiredSize, progressReflowState, 0, 0,
0, frameStatus);
NS_ENSURE_SUCCESS(rv, rv);
MOZ_ASSERT(NS_FRAME_IS_FULLY_COMPLETE(frameStatus),
"We gave our child unconstrained height, so it should be complete");
rv = FinishReflowChild(rangeProgressFrame, aPresContext,
progressDesiredSize, &progressReflowState, 0, 0, 0);
NS_ENSURE_SUCCESS(rv, rv);
DoUpdateRangeProgressFrame(rangeProgressFrame, nsSize(aDesiredSize.Width(),
aDesiredSize.Height()));
}
return NS_OK;
}
#ifdef ACCESSIBILITY
a11y::AccType
nsRangeFrame::AccessibleType()
{
return a11y::eHTMLRangeType;
}
#endif
double
nsRangeFrame::GetValueAsFractionOfRange()
{
MOZ_ASSERT(mContent->IsHTML(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->eventStructType == NS_MOUSE_EVENT ||
aEvent->eventStructType == NS_TOUCH_EVENT,
"Unexpected event type - aEvent->refPoint may be meaningless");
MOZ_ASSERT(mContent->IsHTML(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->eventStructType == NS_TOUCH_EVENT) {
MOZ_ASSERT(aEvent->AsTouchEvent()->touches.Length() == 1,
"Unexpected number of touches");
absPoint = LayoutDeviceIntPoint::FromUntyped(
aEvent->AsTouchEvent()->touches[0]->mRefPoint);
} else {
absPoint = aEvent->refPoint;
}
nsPoint point =
nsLayoutUtils::GetEventCoordinatesRelativeTo(aEvent,
LayoutDeviceIntPoint::ToUntyped(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();
nsRefPtr<nsRenderingContext> tmpCtx =
presContext->PresShell()->CreateReferenceRenderingContext();
bool notUsedCanOverride;
nsIntSize size;
presContext->GetTheme()->
GetMinimumWidgetSize(tmpCtx.get(), 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) / traversableDistance;
if (StyleVisibility()->mDirection == NS_STYLE_DIRECTION_RTL) {
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) / traversableDistance;
}
MOZ_ASSERT(fraction >= 0 && fraction <= 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);
// We are called under Reflow, so we need to pass IsHorizontal a valid rect.
nsSize frameSizeOverride(aRangeSize.width, aRangeSize.height);
if (IsHorizontal(&frameSizeOverride)) {
if (thumbSize.width < rangeContentBoxSize.width) {
nscoord traversableDistance =
rangeContentBoxSize.width - thumbSize.width;
if (StyleVisibility()->mDirection == NS_STYLE_DIRECTION_RTL) {
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);
// We are called under Reflow, so we need to pass IsHorizontal a valid rect.
nsSize frameSizeOverride(aRangeSize.width, aRangeSize.height);
if (IsHorizontal(&frameSizeOverride)) {
nscoord progLength = NSToCoordRound(fraction * rangeContentBoxSize.width);
if (StyleVisibility()->mDirection == NS_STYLE_DIRECTION_RTL) {
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->IsHTML(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);
}
nsSize
nsRangeFrame::ComputeAutoSize(nsRenderingContext *aRenderingContext,
nsSize aCBSize, nscoord aAvailableWidth,
nsSize aMargin, nsSize aBorder,
nsSize aPadding, bool aShrinkWrap)
{
nscoord oneEm = NSToCoordRound(StyleFont()->mFont.size *
nsLayoutUtils::FontSizeInflationFor(this)); // 1em
// frameSizeOverride values just gets us to fall back to being horizontal
// (the actual values are irrelevant, as long as width > height):
nsSize frameSizeOverride(10,1);
bool isHorizontal = IsHorizontal(&frameSizeOverride);
nsSize autoSize;
// 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 (isHorizontal) {
autoSize.width = LONG_SIDE_TO_SHORT_SIDE_RATIO * oneEm;
autoSize.height = IsThemed() ? 0 : oneEm;
} else {
autoSize.width = IsThemed() ? 0 : oneEm;
autoSize.height = LONG_SIDE_TO_SHORT_SIDE_RATIO * oneEm;
}
return autoSize;
}
nscoord
nsRangeFrame::GetMinWidth(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::GetPrefWidth(nsRenderingContext *aRenderingContext)
{
// frameSizeOverride values just gets us to fall back to being horizontal:
nsSize frameSizeOverride(10,1);
bool isHorizontal = IsHorizontal(&frameSizeOverride);
if (!isHorizontal && 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 "natuaral" width when we're a
// vertical slider.
return 0;
}
nscoord prefWidth = NSToCoordRound(StyleFont()->mFont.size *
nsLayoutUtils::FontSizeInflationFor(this)); // 1em
if (isHorizontal) {
prefWidth *= LONG_SIDE_TO_SHORT_SIDE_RATIO;
}
return prefWidth;
}
bool
nsRangeFrame::IsHorizontal(const nsSize *aFrameSizeOverride) const
{
dom::HTMLInputElement* element = static_cast<dom::HTMLInputElement*>(mContent);
return !element->AttrValueIs(kNameSpaceID_None, nsGkAtoms::orient,
nsGkAtoms::vertical, 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
{
return (StyleDisplay()->mAppearance == NS_THEME_RANGE) &&
!PresContext()->HasAuthorSpecifiedRules(const_cast<nsRangeFrame*>(this),
(NS_AUTHOR_SPECIFIED_BORDER |
NS_AUTHOR_SPECIFIED_BACKGROUND)) &&
!PresContext()->HasAuthorSpecifiedRules(mTrackDiv->GetPrimaryFrame(),
STYLES_DISABLING_NATIVE_THEMING) &&
!PresContext()->HasAuthorSpecifiedRules(mProgressDiv->GetPrimaryFrame(),
STYLES_DISABLING_NATIVE_THEMING) &&
!PresContext()->HasAuthorSpecifiedRules(mThumbDiv->GetPrimaryFrame(),
STYLES_DISABLING_NATIVE_THEMING);
}
Element*
nsRangeFrame::GetPseudoElement(nsCSSPseudoElements::Type aType)
{
if (aType == nsCSSPseudoElements::ePseudo_mozRangeTrack) {
return mTrackDiv;
}
if (aType == nsCSSPseudoElements::ePseudo_mozRangeThumb) {
return mThumbDiv;
}
if (aType == nsCSSPseudoElements::ePseudo_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.
return aIndex == 0 ? mOuterFocusStyle : nullptr;
}
void
nsRangeFrame::SetAdditionalStyleContext(int32_t aIndex,
nsStyleContext* aStyleContext)
{
MOZ_ASSERT(aIndex == 0,
"GetAdditionalStyleContext is handling other indexes?");
// The -moz-focus-outer pseudo-element's style has changed.
mOuterFocusStyle = aStyleContext;
}
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