mozilla
/
gecko-dev
зеркало из https://github.com/mozilla/gecko-dev.git
1
0
Форкнуть 0
Код Задачи Пакеты Проекты Релизы Вики Активность
gecko-dev/layout/forms/nsRangeFrame.cpp

834 строки
31 KiB
C++
Исходник Ответственный История

/* -*- 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/TouchEvents.h"
#include "nsContentCreatorFunctions.h"
#include "nsContentList.h"
#include "nsContentUtils.h"
#include "nsCSSRenderingBorders.h"
#include "nsFormControlFrame.h"
#include "nsIContent.h"
#include "nsIDocument.h"
#include "nsINameSpaceManager.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;
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();
}
}
}
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(nsIContent** aResult,
nsCSSPseudoElements::Type aPseudoType,
nsTArray<ContentInfo>& aElements)
{
// Get the NodeInfoManager and tag necessary to create the anonymous divs.
nsCOMPtr<nsIDocument> doc = mContent->GetDocument();
nsCOMPtr<nsINodeInfo> nodeInfo;
nodeInfo = doc->NodeInfoManager()->GetNodeInfo(nsGkAtoms::div, nullptr,
kNameSpaceID_XHTML,
nsIDOMNode::ELEMENT_NODE);
NS_ENSURE_TRUE(nodeInfo, NS_ERROR_OUT_OF_MEMORY);
nsresult rv = NS_NewHTMLElement(aResult, nodeInfo.forget(),
dom::NOT_FROM_PARSER);
NS_ENSURE_SUCCESS(rv, rv);
// Associate the pseudo-element with the anonymous child.
nsRefPtr<nsStyleContext> newStyleContext =
PresContext()->StyleSet()->ResolvePseudoElementStyle(mContent->AsElement(),
aPseudoType,
StyleContext());
if (!aElements.AppendElement(ContentInfo(*aResult, newStyleContext))) {
return NS_ERROR_OUT_OF_MEMORY;
}
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 void Paint(nsDisplayListBuilder* aBuilder, nsRenderingContext* aCtx) MOZ_OVERRIDE;
NS_DISPLAY_DECL_NAME("RangeFocusRing", TYPE_OUTLINE)
};
void
nsDisplayRangeFocusRing::Paint(nsDisplayListBuilder* aBuilder,
nsRenderingContext* aCtx)
{
nsPresContext *presContext = mFrame->PresContext();
nscoord appUnitsPerDevPixel = presContext->DevPixelsToAppUnits(1);
gfxContext* ctx = aCtx->ThebesContext();
nsRect r = nsRect(ToReferenceFrame(), mFrame->GetSize());
gfxRect pxRect(nsLayoutUtils::RectToGfxRect(r, appUnitsPerDevPixel));
uint8_t borderStyles[4] = { NS_STYLE_BORDER_STYLE_DOTTED,
NS_STYLE_BORDER_STYLE_DOTTED,
NS_STYLE_BORDER_STYLE_DOTTED,
NS_STYLE_BORDER_STYLE_DOTTED };
gfxFloat borderWidths[4] = { 1, 1, 1, 1 };
gfxCornerSizes borderRadii(0);
nscolor borderColors[4] = { NS_RGB(0, 0, 0), NS_RGB(0, 0, 0),
NS_RGB(0, 0, 0), NS_RGB(0, 0, 0) };
nsStyleContext* bgContext = mFrame->StyleContext();
nscolor bgColor =
bgContext->GetVisitedDependentColor(eCSSProperty_background_color);
ctx->Save();
nsCSSBorderRenderer br(appUnitsPerDevPixel,
ctx,
pxRect,
borderStyles,
borderWidths,
borderRadii,
borderColors,
nullptr,
0,
bgColor);
br.DrawBorders();
ctx->Restore();
}
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:
nsEventStates eventStates = mContent->AsElement()->State();
if (!eventStates.HasState(NS_EVENT_STATE_FOCUSRING) ||
eventStates.HasState(NS_EVENT_STATE_DISABLED)) {
return;
}
nsPresContext *presContext = PresContext();
const nsStyleDisplay *disp = StyleDisplay();
if ((!IsThemed(disp) ||
!presContext->GetTheme()->ThemeDrawsFocusForWidget(disp->mAppearance)) &&
IsVisibleForPainting(aBuilder)) {
aLists.Content()->AppendNewToTop(
new (aBuilder) nsDisplayRangeFocusRing(aBuilder, this));
}
}
NS_IMETHODIMP
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.mComputedBorderPadding.LeftRight();
aDesiredSize.height = computedHeight +
aReflowState.mComputedBorderPadding.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.mComputedBorderPadding.left +
trackReflowState.ComputedWidth() / 2;
trackY -= trackReflowState.mComputedBorderPadding.top +
trackReflowState.ComputedHeight() / 2;
// Make relative to our border box instead of our content box:
trackX += aReflowState.mComputedBorderPadding.left;
trackY += aReflowState.mComputedBorderPadding.top;
nsReflowStatus frameStatus;
nsHTMLReflowMetrics trackDesiredSize;
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, &trackReflowState,
trackDesiredSize, 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;
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, &thumbReflowState,
thumbDesiredSize, 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;
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,
&progressReflowState, progressDesiredSize, 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(static_cast<WidgetTouchEvent*>(aEvent)->touches.Length() == 1,
"Unexpected number of touches");
absPoint = LayoutDeviceIntPoint::FromUntyped(
static_cast<WidgetTouchEvent*>(aEvent)->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()->GetReferenceRenderingContext();
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);
}
NS_IMETHODIMP
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);
}
Ссылка в новой задаче Показать git blame Копировать постоянную ссылку