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gecko-dev/layout/xul/nsSliderFrame.cpp

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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/. */
//
// Eric Vaughan
// Netscape Communications
//
// See documentation in associated header file
//
#include "nsSliderFrame.h"
#include "mozilla/ComputedStyle.h"
#include "nsPresContext.h"
#include "nsIContent.h"
#include "nsCOMPtr.h"
#include "nsNameSpaceManager.h"
#include "nsGkAtoms.h"
#include "nsHTMLParts.h"
#include "nsCSSRendering.h"
#include "nsScrollbarButtonFrame.h"
#include "nsIScrollableFrame.h"
#include "nsIScrollbarMediator.h"
#include "nsISupportsImpl.h"
#include "nsScrollbarFrame.h"
#include "nsRepeatService.h"
#include "nsBoxLayoutState.h"
#include "nsSprocketLayout.h"
#include "nsContentUtils.h"
#include "nsLayoutUtils.h"
#include "nsDisplayList.h"
#include "nsRefreshDriver.h" // for nsAPostRefreshObserver
#include "mozilla/Assertions.h" // for MOZ_ASSERT
#include "mozilla/LookAndFeel.h"
#include "mozilla/MouseEvents.h"
#include "mozilla/Preferences.h"
#include "mozilla/PresShell.h"
#include "mozilla/SVGIntegrationUtils.h"
#include "mozilla/Telemetry.h"
#include "mozilla/dom/Event.h"
#include "mozilla/layers/APZCCallbackHelper.h"
#include "mozilla/layers/AsyncDragMetrics.h"
#include "mozilla/layers/InputAPZContext.h"
#include <algorithm>
using namespace mozilla;
using mozilla::dom::Event;
using mozilla::layers::APZCCallbackHelper;
using mozilla::layers::AsyncDragMetrics;
using mozilla::layers::InputAPZContext;
using mozilla::layers::ScrollbarData;
using mozilla::layers::ScrollDirection;
bool nsSliderFrame::gMiddlePref = false;
int32_t nsSliderFrame::gSnapMultiplier;
// Turn this on if you want to debug slider frames.
#undef DEBUG_SLIDER
static already_AddRefed<nsIContent> GetContentOfBox(nsIFrame* aBox) {
nsCOMPtr<nsIContent> content = aBox->GetContent();
return content.forget();
}
nsIFrame* NS_NewSliderFrame(PresShell* aPresShell, ComputedStyle* aStyle) {
return new (aPresShell) nsSliderFrame(aStyle, aPresShell->GetPresContext());
}
NS_IMPL_FRAMEARENA_HELPERS(nsSliderFrame)
NS_QUERYFRAME_HEAD(nsSliderFrame)
NS_QUERYFRAME_ENTRY(nsSliderFrame)
NS_QUERYFRAME_TAIL_INHERITING(nsBoxFrame)
nsSliderFrame::nsSliderFrame(ComputedStyle* aStyle, nsPresContext* aPresContext)
: nsBoxFrame(aStyle, aPresContext, kClassID),
mRatio(0.0f),
mDragStart(0),
mThumbStart(0),
mCurPos(0),
mChange(0),
mDragFinished(true),
mUserChanged(false),
mScrollingWithAPZ(false),
mSuppressionActive(false) {}
// stop timer
nsSliderFrame::~nsSliderFrame() {
if (mSuppressionActive) {
if (mozilla::PresShell* presShell = PresShell()) {
presShell->SuppressDisplayport(false);
}
}
}
void nsSliderFrame::Init(nsIContent* aContent, nsContainerFrame* aParent,
nsIFrame* aPrevInFlow) {
nsBoxFrame::Init(aContent, aParent, aPrevInFlow);
static bool gotPrefs = false;
if (!gotPrefs) {
gotPrefs = true;
gMiddlePref = Preferences::GetBool("middlemouse.scrollbarPosition");
gSnapMultiplier = Preferences::GetInt("slider.snapMultiplier");
}
mCurPos = GetCurrentPosition(aContent);
}
void nsSliderFrame::RemoveFrame(ChildListID aListID, nsIFrame* aOldFrame) {
nsBoxFrame::RemoveFrame(aListID, aOldFrame);
if (mFrames.IsEmpty()) RemoveListener();
}
void nsSliderFrame::InsertFrames(ChildListID aListID, nsIFrame* aPrevFrame,
const nsLineList::iterator* aPrevFrameLine,
nsFrameList& aFrameList) {
bool wasEmpty = mFrames.IsEmpty();
nsBoxFrame::InsertFrames(aListID, aPrevFrame, aPrevFrameLine, aFrameList);
if (wasEmpty) AddListener();
}
void nsSliderFrame::AppendFrames(ChildListID aListID, nsFrameList& aFrameList) {
// if we have no children and on was added then make sure we add the
// listener
bool wasEmpty = mFrames.IsEmpty();
nsBoxFrame::AppendFrames(aListID, aFrameList);
if (wasEmpty) AddListener();
}
int32_t nsSliderFrame::GetCurrentPosition(nsIContent* content) {
return GetIntegerAttribute(content, nsGkAtoms::curpos, 0);
}
int32_t nsSliderFrame::GetMinPosition(nsIContent* content) {
return GetIntegerAttribute(content, nsGkAtoms::minpos, 0);
}
int32_t nsSliderFrame::GetMaxPosition(nsIContent* content) {
return GetIntegerAttribute(content, nsGkAtoms::maxpos, 100);
}
int32_t nsSliderFrame::GetIncrement(nsIContent* content) {
return GetIntegerAttribute(content, nsGkAtoms::increment, 1);
}
int32_t nsSliderFrame::GetPageIncrement(nsIContent* content) {
return GetIntegerAttribute(content, nsGkAtoms::pageincrement, 10);
}
int32_t nsSliderFrame::GetIntegerAttribute(nsIContent* content, nsAtom* atom,
int32_t defaultValue) {
nsAutoString value;
if (content->IsElement()) {
content->AsElement()->GetAttr(kNameSpaceID_None, atom, value);
}
if (!value.IsEmpty()) {
nsresult error;
// convert it to an integer
defaultValue = value.ToInteger(&error);
}
return defaultValue;
}
nsresult nsSliderFrame::AttributeChanged(int32_t aNameSpaceID,
nsAtom* aAttribute, int32_t aModType) {
nsresult rv =
nsBoxFrame::AttributeChanged(aNameSpaceID, aAttribute, aModType);
// if the current position changes
if (aAttribute == nsGkAtoms::curpos) {
CurrentPositionChanged();
} else if (aAttribute == nsGkAtoms::minpos ||
aAttribute == nsGkAtoms::maxpos) {
// bounds check it.
nsIFrame* scrollbarBox = GetScrollbar();
nsCOMPtr<nsIContent> scrollbar = GetContentOfBox(scrollbarBox);
int32_t current = GetCurrentPosition(scrollbar);
int32_t min = GetMinPosition(scrollbar);
int32_t max = GetMaxPosition(scrollbar);
if (current < min || current > max) {
int32_t direction = 0;
if (current < min || max < min) {
current = min;
direction = -1;
} else if (current > max) {
current = max;
direction = 1;
}
// set the new position and notify observers
nsScrollbarFrame* scrollbarFrame = do_QueryFrame(scrollbarBox);
if (scrollbarFrame) {
nsIScrollbarMediator* mediator = scrollbarFrame->GetScrollbarMediator();
scrollbarFrame->SetIncrementToWhole(direction);
if (mediator) {
mediator->ScrollByWhole(scrollbarFrame, direction,
nsIScrollbarMediator::ENABLE_SNAP);
}
}
// 'this' might be destroyed here
nsContentUtils::AddScriptRunner(new nsSetAttrRunnable(
scrollbar->AsElement(), nsGkAtoms::curpos, current));
}
}
if (aAttribute == nsGkAtoms::minpos || aAttribute == nsGkAtoms::maxpos ||
aAttribute == nsGkAtoms::pageincrement ||
aAttribute == nsGkAtoms::increment) {
PresShell()->FrameNeedsReflow(this, IntrinsicDirty::StyleChange,
NS_FRAME_IS_DIRTY);
}
return rv;
}
void nsSliderFrame::BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists) {
if (aBuilder->IsForEventDelivery() && isDraggingThumb()) {
// This is EVIL, we shouldn't be messing with event delivery just to get
// thumb mouse drag events to arrive at the slider!
aLists.Outlines()->AppendNewToTop<nsDisplayEventReceiver>(aBuilder, this);
return;
}
nsBoxFrame::BuildDisplayList(aBuilder, aLists);
}
static bool UsesCustomScrollbarMediator(nsIFrame* scrollbarBox) {
if (nsScrollbarFrame* scrollbarFrame = do_QueryFrame(scrollbarBox)) {
if (nsIScrollbarMediator* mediator =
scrollbarFrame->GetScrollbarMediator()) {
nsIScrollableFrame* scrollFrame = do_QueryFrame(mediator);
// The scrollbar mediator is not the scroll frame.
// That means this scroll frame has a custom scrollbar mediator.
if (!scrollFrame) {
return true;
}
}
}
return false;
}
void nsSliderFrame::BuildDisplayListForChildren(
nsDisplayListBuilder* aBuilder, const nsDisplayListSet& aLists) {
// if we are too small to have a thumb don't paint it.
nsIFrame* thumb = nsIFrame::GetChildXULBox(this);
if (thumb) {
nsRect thumbRect(thumb->GetRect());
nsMargin m;
thumb->GetXULMargin(m);
thumbRect.Inflate(m);
nsRect sliderTrack;
GetXULClientRect(sliderTrack);
if (sliderTrack.width < thumbRect.width ||
sliderTrack.height < thumbRect.height)
return;
// If this scrollbar is the scrollbar of an actively scrolled scroll frame,
// layerize the scrollbar thumb, wrap it in its own ContainerLayer and
// attach scrolling information to it.
// We do this here and not in the thumb's nsBoxFrame::BuildDisplayList so
// that the event region that gets created for the thumb is included in
// the nsDisplayOwnLayer contents.
const mozilla::layers::ScrollableLayerGuid::ViewID scrollTargetId =
aBuilder->GetCurrentScrollbarTarget();
const bool thumbGetsLayer =
(scrollTargetId != layers::ScrollableLayerGuid::NULL_SCROLL_ID);
if (thumbGetsLayer) {
const Maybe<ScrollDirection> scrollDirection =
aBuilder->GetCurrentScrollbarDirection();
MOZ_ASSERT(scrollDirection.isSome());
const bool isHorizontal =
*scrollDirection == ScrollDirection::eHorizontal;
const float appUnitsPerCss = float(AppUnitsPerCSSPixel());
const CSSCoord thumbLength = NSAppUnitsToFloatPixels(
isHorizontal ? thumbRect.width : thumbRect.height, appUnitsPerCss);
nsIFrame* scrollbarBox = GetScrollbar();
bool isAsyncDraggable = !UsesCustomScrollbarMediator(scrollbarBox);
nsPoint scrollPortOrigin;
if (nsIScrollableFrame* scrollFrame =
do_QueryFrame(scrollbarBox->GetParent())) {
scrollPortOrigin = scrollFrame->GetScrollPortRect().TopLeft();
} else {
isAsyncDraggable = false;
}
// This rect is the range in which the scroll thumb can slide in.
sliderTrack = sliderTrack + GetRect().TopLeft() +
scrollbarBox->GetPosition() - scrollPortOrigin;
const CSSCoord sliderTrackStart = NSAppUnitsToFloatPixels(
isHorizontal ? sliderTrack.x : sliderTrack.y, appUnitsPerCss);
const CSSCoord sliderTrackLength = NSAppUnitsToFloatPixels(
isHorizontal ? sliderTrack.width : sliderTrack.height,
appUnitsPerCss);
const CSSCoord thumbStart = NSAppUnitsToFloatPixels(
isHorizontal ? thumbRect.x : thumbRect.y, appUnitsPerCss);
const nsRect overflow = thumb->InkOverflowRectRelativeToParent();
nsSize refSize = aBuilder->RootReferenceFrame()->GetSize();
nsRect dirty = aBuilder->GetVisibleRect().Intersect(thumbRect);
dirty = nsLayoutUtils::ComputePartialPrerenderArea(
thumb, aBuilder->GetVisibleRect(), overflow, refSize);
nsDisplayListBuilder::AutoBuildingDisplayList buildingDisplayList(
aBuilder, this, dirty, dirty);
// Clip the thumb layer to the slider track. This is necessary to ensure
// FrameLayerBuilder is able to merge content before and after the
// scrollframe into the same layer (otherwise it thinks the thumb could
// potentially move anywhere within the existing clip).
DisplayListClipState::AutoSaveRestore thumbClipState(aBuilder);
thumbClipState.ClipContainingBlockDescendants(
GetRectRelativeToSelf() + aBuilder->ToReferenceFrame(this));
// Have the thumb's container layer capture the current clip, so
// it doesn't apply to the thumb's contents. This allows the contents
// to be fully rendered even if they're partially or fully offscreen,
// so async scrolling can still bring it into view.
DisplayListClipState::AutoSaveRestore thumbContentsClipState(aBuilder);
thumbContentsClipState.Clear();
nsDisplayListBuilder::AutoContainerASRTracker contASRTracker(aBuilder);
nsDisplayListCollection tempLists(aBuilder);
nsBoxFrame::BuildDisplayListForChildren(aBuilder, tempLists);
// This is a bit of a hack. Collect up all descendant display items
// and merge them into a single Content() list.
nsDisplayList masterList;
masterList.AppendToTop(tempLists.BorderBackground());
masterList.AppendToTop(tempLists.BlockBorderBackgrounds());
masterList.AppendToTop(tempLists.Floats());
masterList.AppendToTop(tempLists.Content());
masterList.AppendToTop(tempLists.PositionedDescendants());
masterList.AppendToTop(tempLists.Outlines());
// Restore the saved clip so it applies to the thumb container layer.
thumbContentsClipState.Restore();
// Wrap the list to make it its own layer.
const ActiveScrolledRoot* ownLayerASR = contASRTracker.GetContainerASR();
aLists.Content()->AppendNewToTopWithIndex<nsDisplayOwnLayer>(
aBuilder, this,
/* aIndex = */ nsDisplayOwnLayer::OwnLayerForScrollThumb, &masterList,
ownLayerASR, nsDisplayOwnLayerFlags::None,
ScrollbarData::CreateForThumb(*scrollDirection, GetThumbRatio(),
thumbStart, thumbLength,
isAsyncDraggable, sliderTrackStart,
sliderTrackLength, scrollTargetId),
true, false);
return;
}
}
nsBoxFrame::BuildDisplayListForChildren(aBuilder, aLists);
}
NS_IMETHODIMP
nsSliderFrame::DoXULLayout(nsBoxLayoutState& aState) {
// get the thumb should be our only child
nsIFrame* thumbBox = nsIFrame::GetChildXULBox(this);
if (!thumbBox) {
SyncXULLayout(aState);
return NS_OK;
}
EnsureOrient();
// get the content area inside our borders
nsRect clientRect;
GetXULClientRect(clientRect);
// get the scrollbar
nsIFrame* scrollbarBox = GetScrollbar();
nsCOMPtr<nsIContent> scrollbar = GetContentOfBox(scrollbarBox);
// get the thumb's pref size
nsSize thumbSize = thumbBox->GetXULPrefSize(aState);
if (IsXULHorizontal())
thumbSize.height = clientRect.height;
else
thumbSize.width = clientRect.width;
int32_t curPos = GetCurrentPosition(scrollbar);
int32_t minPos = GetMinPosition(scrollbar);
int32_t maxPos = GetMaxPosition(scrollbar);
int32_t pageIncrement = GetPageIncrement(scrollbar);
maxPos = std::max(minPos, maxPos);
curPos = clamped(curPos, minPos, maxPos);
nscoord& availableLength =
IsXULHorizontal() ? clientRect.width : clientRect.height;
nscoord& thumbLength = IsXULHorizontal() ? thumbSize.width : thumbSize.height;
if ((pageIncrement + maxPos - minPos) > 0 && thumbBox->GetXULFlex() > 0) {
float ratio = float(pageIncrement) / float(maxPos - minPos + pageIncrement);
thumbLength =
std::max(thumbLength, NSToCoordRound(availableLength * ratio));
}
// Round the thumb's length to device pixels.
nsPresContext* presContext = PresContext();
thumbLength = presContext->DevPixelsToAppUnits(
presContext->AppUnitsToDevPixels(thumbLength));
// mRatio translates the thumb position in app units to the value.
mRatio = (minPos != maxPos)
? float(availableLength - thumbLength) / float(maxPos - minPos)
: 1;
// in reverse mode, curpos is reversed such that lower values are to the
// right or bottom and increase leftwards or upwards. In this case, use the
// offset from the end instead of the beginning.
bool reverse = mContent->AsElement()->AttrValueIs(
kNameSpaceID_None, nsGkAtoms::dir, nsGkAtoms::reverse, eCaseMatters);
nscoord pos = reverse ? (maxPos - curPos) : (curPos - minPos);
// set the thumb's coord to be the current pos * the ratio.
nsRect thumbRect(clientRect.x, clientRect.y, thumbSize.width,
thumbSize.height);
int32_t& thumbPos = (IsXULHorizontal() ? thumbRect.x : thumbRect.y);
thumbPos += NSToCoordRound(pos * mRatio);
nsRect oldThumbRect(thumbBox->GetRect());
LayoutChildAt(aState, thumbBox, thumbRect);
SyncXULLayout(aState);
// Redraw only if thumb changed size.
if (!oldThumbRect.IsEqualInterior(thumbRect)) XULRedraw(aState);
return NS_OK;
}
nsresult nsSliderFrame::HandleEvent(nsPresContext* aPresContext,
WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus) {
NS_ENSURE_ARG_POINTER(aEventStatus);
if (mAPZDragInitiated &&
*mAPZDragInitiated == InputAPZContext::GetInputBlockId() &&
aEvent->mMessage == eMouseDown) {
// If we get the mousedown after the APZ notification, then immediately
// switch into the state corresponding to an APZ thumb-drag. Note that
// we can't just do this in AsyncScrollbarDragInitiated() directly because
// the handling for this mousedown event in the presShell will reset the
// capturing content which makes isDraggingThumb() return false. We check
// the input block here to make sure that we correctly handle any ordering
// of {eMouseDown arriving, AsyncScrollbarDragInitiated() being called}.
mAPZDragInitiated = Nothing();
DragThumb(true);
mScrollingWithAPZ = true;
return NS_OK;
}
// If a web page calls event.preventDefault() we still want to
// scroll when scroll arrow is clicked. See bug 511075.
if (!mContent->IsInNativeAnonymousSubtree() &&
nsEventStatus_eConsumeNoDefault == *aEventStatus) {
return NS_OK;
}
if (!mDragFinished && !isDraggingThumb()) {
StopDrag();
return NS_OK;
}
nsIFrame* scrollbarBox = GetScrollbar();
nsCOMPtr<nsIContent> scrollbar;
scrollbar = GetContentOfBox(scrollbarBox);
bool isHorizontal = IsXULHorizontal();
if (isDraggingThumb()) {
switch (aEvent->mMessage) {
case eTouchMove:
case eMouseMove: {
if (mScrollingWithAPZ) {
break;
}
nsPoint eventPoint;
if (!GetEventPoint(aEvent, eventPoint)) {
break;
}
if (mChange) {
// On Linux the destination point is determined by the initial click
// on the scrollbar track and doesn't change until the mouse button
// is released.
#ifndef MOZ_WIDGET_GTK
// On the other platforms we need to update the destination point now.
mDestinationPoint = eventPoint;
StopRepeat();
StartRepeat();
#endif
break;
}
nscoord pos = isHorizontal ? eventPoint.x : eventPoint.y;
nsIFrame* thumbFrame = mFrames.FirstChild();
if (!thumbFrame) {
return NS_OK;
}
// take our current position and subtract the start location
pos -= mDragStart;
bool isMouseOutsideThumb = false;
if (gSnapMultiplier) {
nsSize thumbSize = thumbFrame->GetSize();
if (isHorizontal) {
// horizontal scrollbar - check if mouse is above or below thumb
// XXXbz what about looking at the .y of the thumb's rect? Is that
// always zero here?
if (eventPoint.y < -gSnapMultiplier * thumbSize.height ||
eventPoint.y >
thumbSize.height + gSnapMultiplier * thumbSize.height)
isMouseOutsideThumb = true;
} else {
// vertical scrollbar - check if mouse is left or right of thumb
if (eventPoint.x < -gSnapMultiplier * thumbSize.width ||
eventPoint.x >
thumbSize.width + gSnapMultiplier * thumbSize.width)
isMouseOutsideThumb = true;
}
}
if (aEvent->mClass == eTouchEventClass) {
*aEventStatus = nsEventStatus_eConsumeNoDefault;
}
if (isMouseOutsideThumb) {
SetCurrentThumbPosition(scrollbar, mThumbStart, false, false);
return NS_OK;
}
// set it
SetCurrentThumbPosition(scrollbar, pos, false, true); // with snapping
} break;
case eTouchEnd:
case eMouseUp:
if (ShouldScrollForEvent(aEvent)) {
StopDrag();
// we MUST call nsFrame HandleEvent for mouse ups to maintain the
// selection state and capture state.
return nsIFrame::HandleEvent(aPresContext, aEvent, aEventStatus);
}
break;
default:
break;
}
// return nsIFrame::HandleEvent(aPresContext, aEvent, aEventStatus);
return NS_OK;
}
if (ShouldScrollToClickForEvent(aEvent)) {
nsPoint eventPoint;
if (!GetEventPoint(aEvent, eventPoint)) {
return NS_OK;
}
nscoord pos = isHorizontal ? eventPoint.x : eventPoint.y;
// adjust so that the middle of the thumb is placed under the click
nsIFrame* thumbFrame = mFrames.FirstChild();
if (!thumbFrame) {
return NS_OK;
}
nsSize thumbSize = thumbFrame->GetSize();
nscoord thumbLength = isHorizontal ? thumbSize.width : thumbSize.height;
// set it
AutoWeakFrame weakFrame(this);
// should aMaySnap be true here?
SetCurrentThumbPosition(scrollbar, pos - thumbLength / 2, false, false);
NS_ENSURE_TRUE(weakFrame.IsAlive(), NS_OK);
DragThumb(true);
#ifdef MOZ_WIDGET_GTK
RefPtr<dom::Element> thumb = thumbFrame->GetContent()->AsElement();
thumb->SetAttr(kNameSpaceID_None, nsGkAtoms::active, u"true"_ns, true);
#endif
if (aEvent->mClass == eTouchEventClass) {
*aEventStatus = nsEventStatus_eConsumeNoDefault;
}
if (isHorizontal)
mThumbStart = thumbFrame->GetPosition().x;
else
mThumbStart = thumbFrame->GetPosition().y;
mDragStart = pos - mThumbStart;
}
#ifdef MOZ_WIDGET_GTK
else if (ShouldScrollForEvent(aEvent) && aEvent->mClass == eMouseEventClass &&
aEvent->AsMouseEvent()->mButton == MouseButton::eSecondary) {
// HandlePress and HandleRelease are usually called via
// nsIFrame::HandleEvent, but only for the left mouse button.
if (aEvent->mMessage == eMouseDown) {
HandlePress(aPresContext, aEvent, aEventStatus);
} else if (aEvent->mMessage == eMouseUp) {
HandleRelease(aPresContext, aEvent, aEventStatus);
}
return NS_OK;
}
#endif
// XXX hack until handle release is actually called in nsframe.
// if (aEvent->mMessage == eMouseOut ||
// aEvent->mMessage == NS_MOUSE_RIGHT_BUTTON_UP ||
// aEvent->mMessage == NS_MOUSE_LEFT_BUTTON_UP) {
// HandleRelease(aPresContext, aEvent, aEventStatus);
// }
if (aEvent->mMessage == eMouseOut && mChange)
HandleRelease(aPresContext, aEvent, aEventStatus);
return nsIFrame::HandleEvent(aPresContext, aEvent, aEventStatus);
}
// Helper function to collect the "scroll to click" metric. Beware of
// caching this, users expect to be able to change the system preference
// and see the browser change its behavior immediately.
bool nsSliderFrame::GetScrollToClick() {
if (GetScrollbar() != this) {
return LookAndFeel::GetInt(LookAndFeel::IntID::ScrollToClick, false);
}
if (mContent->AsElement()->AttrValueIs(kNameSpaceID_None,
nsGkAtoms::movetoclick,
nsGkAtoms::_true, eCaseMatters)) {
return true;
}
if (mContent->AsElement()->AttrValueIs(kNameSpaceID_None,
nsGkAtoms::movetoclick,
nsGkAtoms::_false, eCaseMatters)) {
return false;
}
#ifdef XP_MACOSX
return true;
#else
return false;
#endif
}
nsIFrame* nsSliderFrame::GetScrollbar() {
// if we are in a scrollbar then return the scrollbar's content node
// if we are not then return ours.
nsIFrame* scrollbar;
nsScrollbarButtonFrame::GetParentWithTag(nsGkAtoms::scrollbar, this,
scrollbar);
if (scrollbar == nullptr) return this;
return scrollbar->IsXULBoxFrame() ? scrollbar : this;
}
void nsSliderFrame::PageUpDown(nscoord change) {
// on a page up or down get our page increment. We get this by getting the
// scrollbar we are in and asking it for the current position and the page
// increment. If we are not in a scrollbar we will get the values from our own
// node.
nsIFrame* scrollbarBox = GetScrollbar();
nsCOMPtr<nsIContent> scrollbar;
scrollbar = GetContentOfBox(scrollbarBox);
nscoord pageIncrement = GetPageIncrement(scrollbar);
int32_t curpos = GetCurrentPosition(scrollbar);
int32_t minpos = GetMinPosition(scrollbar);
int32_t maxpos = GetMaxPosition(scrollbar);
// get the new position and make sure it is in bounds
int32_t newpos = curpos + change * pageIncrement;
if (newpos < minpos || maxpos < minpos)
newpos = minpos;
else if (newpos > maxpos)
newpos = maxpos;
SetCurrentPositionInternal(scrollbar, newpos, true);
}
// called when the current position changed and we need to update the thumb's
// location
void nsSliderFrame::CurrentPositionChanged() {
nsIFrame* scrollbarBox = GetScrollbar();
nsCOMPtr<nsIContent> scrollbar = GetContentOfBox(scrollbarBox);
// get the current position
int32_t curPos = GetCurrentPosition(scrollbar);
// do nothing if the position did not change
if (mCurPos == curPos) return;
// get our current min and max position from our content node
int32_t minPos = GetMinPosition(scrollbar);
int32_t maxPos = GetMaxPosition(scrollbar);
maxPos = std::max(minPos, maxPos);
curPos = clamped(curPos, minPos, maxPos);
// get the thumb's rect
nsIFrame* thumbFrame = mFrames.FirstChild();
if (!thumbFrame) return; // The thumb may stream in asynchronously via XBL.
nsRect thumbRect = thumbFrame->GetRect();
nsRect clientRect;
GetXULClientRect(clientRect);
// figure out the new rect
nsRect newThumbRect(thumbRect);
bool reverse = mContent->AsElement()->AttrValueIs(
kNameSpaceID_None, nsGkAtoms::dir, nsGkAtoms::reverse, eCaseMatters);
nscoord pos = reverse ? (maxPos - curPos) : (curPos - minPos);
if (IsXULHorizontal())
newThumbRect.x = clientRect.x + NSToCoordRound(pos * mRatio);
else
newThumbRect.y = clientRect.y + NSToCoordRound(pos * mRatio);
// avoid putting the scroll thumb at subpixel positions which cause needless
// invalidations
nscoord appUnitsPerPixel = PresContext()->AppUnitsPerDevPixel();
nsPoint snappedThumbLocation =
ToAppUnits(newThumbRect.TopLeft().ToNearestPixels(appUnitsPerPixel),
appUnitsPerPixel);
if (IsXULHorizontal()) {
newThumbRect.x = snappedThumbLocation.x;
} else {
newThumbRect.y = snappedThumbLocation.y;
}
// set the rect
thumbFrame->SetRect(newThumbRect);
// Request a repaint of the scrollbar
nsScrollbarFrame* scrollbarFrame = do_QueryFrame(scrollbarBox);
nsIScrollbarMediator* mediator =
scrollbarFrame ? scrollbarFrame->GetScrollbarMediator() : nullptr;
if (!mediator || !mediator->ShouldSuppressScrollbarRepaints()) {
SchedulePaint();
}
mCurPos = curPos;
}
static void UpdateAttribute(dom::Element* aScrollbar, nscoord aNewPos,
bool aNotify, bool aIsSmooth) {
nsAutoString str;
str.AppendInt(aNewPos);
if (aIsSmooth) {
aScrollbar->SetAttr(kNameSpaceID_None, nsGkAtoms::smooth, u"true"_ns,
false);
}
aScrollbar->SetAttr(kNameSpaceID_None, nsGkAtoms::curpos, str, aNotify);
if (aIsSmooth) {
aScrollbar->UnsetAttr(kNameSpaceID_None, nsGkAtoms::smooth, false);
}
}
// Use this function when you want to set the scroll position via the position
// of the scrollbar thumb, e.g. when dragging the slider. This function scrolls
// the content in such a way that thumbRect.x/.y becomes aNewThumbPos.
void nsSliderFrame::SetCurrentThumbPosition(nsIContent* aScrollbar,
nscoord aNewThumbPos,
bool aIsSmooth, bool aMaySnap) {
nsRect crect;
GetXULClientRect(crect);
nscoord offset = IsXULHorizontal() ? crect.x : crect.y;
int32_t newPos = NSToIntRound((aNewThumbPos - offset) / mRatio);
if (aMaySnap &&
mContent->AsElement()->AttrValueIs(kNameSpaceID_None, nsGkAtoms::snap,
nsGkAtoms::_true, eCaseMatters)) {
// If snap="true", then the slider may only be set to min + (increment * x).
// Otherwise, the slider may be set to any positive integer.
int32_t increment = GetIncrement(aScrollbar);
newPos = NSToIntRound(newPos / float(increment)) * increment;
}
SetCurrentPosition(aScrollbar, newPos, aIsSmooth);
}
// Use this function when you know the target scroll position of the scrolled
// content. aNewPos should be passed to this function as a position as if the
// minpos is 0. That is, the minpos will be added to the position by this
// function. In a reverse direction slider, the newpos should be the distance
// from the end.
void nsSliderFrame::SetCurrentPosition(nsIContent* aScrollbar, int32_t aNewPos,
bool aIsSmooth) {
// get min and max position from our content node
int32_t minpos = GetMinPosition(aScrollbar);
int32_t maxpos = GetMaxPosition(aScrollbar);
// in reverse direction sliders, flip the value so that it goes from
// right to left, or bottom to top.
if (mContent->AsElement()->AttrValueIs(kNameSpaceID_None, nsGkAtoms::dir,
nsGkAtoms::reverse, eCaseMatters))
aNewPos = maxpos - aNewPos;
else
aNewPos += minpos;
// get the new position and make sure it is in bounds
if (aNewPos < minpos || maxpos < minpos)
aNewPos = minpos;
else if (aNewPos > maxpos)
aNewPos = maxpos;
SetCurrentPositionInternal(aScrollbar, aNewPos, aIsSmooth);
}
void nsSliderFrame::SetCurrentPositionInternal(nsIContent* aScrollbar,
int32_t aNewPos,
bool aIsSmooth) {
nsCOMPtr<nsIContent> scrollbar = aScrollbar;
nsIFrame* scrollbarBox = GetScrollbar();
AutoWeakFrame weakFrame(this);
mUserChanged = true;
nsScrollbarFrame* scrollbarFrame = do_QueryFrame(scrollbarBox);
if (scrollbarFrame) {
// See if we have a mediator.
nsIScrollbarMediator* mediator = scrollbarFrame->GetScrollbarMediator();
if (mediator) {
nscoord oldPos =
nsPresContext::CSSPixelsToAppUnits(GetCurrentPosition(scrollbar));
nscoord newPos = nsPresContext::CSSPixelsToAppUnits(aNewPos);
mediator->ThumbMoved(scrollbarFrame, oldPos, newPos);
if (!weakFrame.IsAlive()) {
return;
}
UpdateAttribute(scrollbar->AsElement(), aNewPos, /* aNotify */ false,
aIsSmooth);
CurrentPositionChanged();
mUserChanged = false;
return;
}
}
UpdateAttribute(scrollbar->AsElement(), aNewPos, true, aIsSmooth);
if (!weakFrame.IsAlive()) {
return;
}
mUserChanged = false;
#ifdef DEBUG_SLIDER
printf("Current Pos=%d\n", aNewPos);
#endif
}
void nsSliderFrame::SetInitialChildList(ChildListID aListID,
nsFrameList& aChildList) {
nsBoxFrame::SetInitialChildList(aListID, aChildList);
if (aListID == kPrincipalList) {
AddListener();
}
}
nsresult nsSliderMediator::HandleEvent(dom::Event* aEvent) {
// Only process the event if the thumb is not being dragged.
if (mSlider && !mSlider->isDraggingThumb()) return mSlider->StartDrag(aEvent);
return NS_OK;
}
class AsyncScrollbarDragStarter final : public nsAPostRefreshObserver {
public:
AsyncScrollbarDragStarter(mozilla::PresShell* aPresShell, nsIWidget* aWidget,
const AsyncDragMetrics& aDragMetrics)
: mPresShell(aPresShell), mWidget(aWidget), mDragMetrics(aDragMetrics) {}
virtual ~AsyncScrollbarDragStarter() = default;
void DidRefresh() override {
if (!mPresShell) {
MOZ_ASSERT_UNREACHABLE(
"Post-refresh observer fired again after failed attempt at "
"unregistering it");
return;
}
mWidget->StartAsyncScrollbarDrag(mDragMetrics);
if (!mPresShell->RemovePostRefreshObserver(this)) {
MOZ_ASSERT_UNREACHABLE(
"Unable to unregister post-refresh observer! Leaking it instead of "
"leaving garbage registered");
// Graceful handling, just in case...
mPresShell = nullptr;
mWidget = nullptr;
return;
}
delete this;
}
private:
RefPtr<mozilla::PresShell> mPresShell;
RefPtr<nsIWidget> mWidget;
AsyncDragMetrics mDragMetrics;
};
static bool ScrollFrameWillBuildScrollInfoLayer(nsIFrame* aScrollFrame) {
/*
* Note: if changing the conditions in this function, make a corresponding
* change to nsDisplayListBuilder::ShouldBuildScrollInfoItemsForHoisting()
* in nsDisplayList.cpp.
*/
nsIFrame* current = aScrollFrame;
while (current) {
if (SVGIntegrationUtils::UsesSVGEffectsNotSupportedInCompositor(current)) {
return true;
}
current = nsLayoutUtils::GetParentOrPlaceholderForCrossDoc(current);
}
return false;
}
nsIScrollableFrame* nsSliderFrame::GetScrollFrame() {
nsIFrame* scrollbarBox = GetScrollbar();
if (!scrollbarBox) {
return nullptr;
}
nsContainerFrame* scrollFrame = scrollbarBox->GetParent();
if (!scrollFrame) {
return nullptr;
}
nsIScrollableFrame* scrollFrameAsScrollable = do_QueryFrame(scrollFrame);
return scrollFrameAsScrollable;
}
void nsSliderFrame::StartAPZDrag(WidgetGUIEvent* aEvent) {
if (!aEvent->mFlags.mHandledByAPZ) {
return;
}
if (!gfxPlatform::GetPlatform()->SupportsApzDragInput()) {
return;
}
nsIFrame* scrollbarBox = GetScrollbar();
nsContainerFrame* scrollFrame = scrollbarBox->GetParent();
if (!scrollFrame) {
return;
}
nsIContent* scrollableContent = scrollFrame->GetContent();
if (!scrollableContent) {
return;
}
// APZ dragging requires the scrollbar to be layerized, which doesn't
// happen for scroll info layers.
if (ScrollFrameWillBuildScrollInfoLayer(scrollFrame)) {
return;
}
// Custom scrollbar mediators are not supported in the APZ codepath.
if (UsesCustomScrollbarMediator(scrollbarBox)) {
return;
}
bool isHorizontal = IsXULHorizontal();
mozilla::layers::ScrollableLayerGuid::ViewID scrollTargetId;
bool hasID = nsLayoutUtils::FindIDFor(scrollableContent, &scrollTargetId);
bool hasAPZView =
hasID && (scrollTargetId != layers::ScrollableLayerGuid::NULL_SCROLL_ID);
if (!hasAPZView) {
return;
}
if (!nsLayoutUtils::HasDisplayPort(scrollableContent)) {
return;
}
mozilla::PresShell* presShell = PresShell();
uint64_t inputblockId = InputAPZContext::GetInputBlockId();
uint32_t presShellId = presShell->GetPresShellId();
AsyncDragMetrics dragMetrics(
scrollTargetId, presShellId, inputblockId,
NSAppUnitsToFloatPixels(mDragStart, float(AppUnitsPerCSSPixel())),
isHorizontal ? ScrollDirection::eHorizontal : ScrollDirection::eVertical);
// It's important to set this before calling
// nsIWidget::StartAsyncScrollbarDrag(), because in some configurations, that
// can call AsyncScrollbarDragRejected() synchronously, which clears the flag
// (and we want it to stay cleared in that case).
mScrollingWithAPZ = true;
// When we start an APZ drag, we wont get mouse events for the drag.
// APZ will consume them all and only notify us of the new scroll position.
bool waitForRefresh = InputAPZContext::HavePendingLayerization();
nsIWidget* widget = this->GetNearestWidget();
if (waitForRefresh) {
waitForRefresh = presShell->AddPostRefreshObserver(
new AsyncScrollbarDragStarter(presShell, widget, dragMetrics));
}
if (!waitForRefresh) {
widget->StartAsyncScrollbarDrag(dragMetrics);
}
}
nsresult nsSliderFrame::StartDrag(Event* aEvent) {
#ifdef DEBUG_SLIDER
printf("Begin dragging\n");
#endif
if (mContent->AsElement()->AttrValueIs(kNameSpaceID_None, nsGkAtoms::disabled,
nsGkAtoms::_true, eCaseMatters))
return NS_OK;
WidgetGUIEvent* event = aEvent->WidgetEventPtr()->AsGUIEvent();
if (!ShouldScrollForEvent(event)) {
return NS_OK;
}
nsPoint pt;
if (!GetEventPoint(event, pt)) {
return NS_OK;
}
bool isHorizontal = IsXULHorizontal();
nscoord pos = isHorizontal ? pt.x : pt.y;
// If we should scroll-to-click, first place the middle of the slider thumb
// under the mouse.
nsCOMPtr<nsIContent> scrollbar;
nscoord newpos = pos;
bool scrollToClick = ShouldScrollToClickForEvent(event);
if (scrollToClick) {
// adjust so that the middle of the thumb is placed under the click
nsIFrame* thumbFrame = mFrames.FirstChild();
if (!thumbFrame) {
return NS_OK;
}
nsSize thumbSize = thumbFrame->GetSize();
nscoord thumbLength = isHorizontal ? thumbSize.width : thumbSize.height;
newpos -= (thumbLength / 2);
nsIFrame* scrollbarBox = GetScrollbar();
scrollbar = GetContentOfBox(scrollbarBox);
}
DragThumb(true);
if (scrollToClick) {
// should aMaySnap be true here?
SetCurrentThumbPosition(scrollbar, newpos, false, false);
}
nsIFrame* thumbFrame = mFrames.FirstChild();
if (!thumbFrame) {
return NS_OK;
}
#ifdef MOZ_WIDGET_GTK
RefPtr<dom::Element> thumb = thumbFrame->GetContent()->AsElement();
thumb->SetAttr(kNameSpaceID_None, nsGkAtoms::active, u"true"_ns, true);
#endif
if (isHorizontal)
mThumbStart = thumbFrame->GetPosition().x;
else
mThumbStart = thumbFrame->GetPosition().y;
mDragStart = pos - mThumbStart;
mScrollingWithAPZ = false;
StartAPZDrag(event); // sets mScrollingWithAPZ=true if appropriate
#ifdef DEBUG_SLIDER
printf("Pressed mDragStart=%d\n", mDragStart);
#endif
if (!mScrollingWithAPZ) {
SuppressDisplayport();
}
return NS_OK;
}
nsresult nsSliderFrame::StopDrag() {
AddListener();
DragThumb(false);
mScrollingWithAPZ = false;
UnsuppressDisplayport();
#ifdef MOZ_WIDGET_GTK
nsIFrame* thumbFrame = mFrames.FirstChild();
if (thumbFrame) {
RefPtr<dom::Element> thumb = thumbFrame->GetContent()->AsElement();
thumb->UnsetAttr(kNameSpaceID_None, nsGkAtoms::active, true);
}
#endif
if (mChange) {
StopRepeat();
mChange = 0;
}
return NS_OK;
}
void nsSliderFrame::DragThumb(bool aGrabMouseEvents) {
mDragFinished = !aGrabMouseEvents;
if (aGrabMouseEvents) {
PresShell::SetCapturingContent(GetContent(),
CaptureFlags::IgnoreAllowedState);
} else {
PresShell::ReleaseCapturingContent();
}
}
bool nsSliderFrame::isDraggingThumb() const {
return PresShell::GetCapturingContent() == GetContent();
}
void nsSliderFrame::AddListener() {
if (!mMediator) {
mMediator = new nsSliderMediator(this);
}
nsIFrame* thumbFrame = mFrames.FirstChild();
if (!thumbFrame) {
return;
}
thumbFrame->GetContent()->AddSystemEventListener(u"mousedown"_ns, mMediator,
false, false);
thumbFrame->GetContent()->AddSystemEventListener(u"touchstart"_ns, mMediator,
false, false);
}
void nsSliderFrame::RemoveListener() {
NS_ASSERTION(mMediator, "No listener was ever added!!");
nsIFrame* thumbFrame = mFrames.FirstChild();
if (!thumbFrame) return;
thumbFrame->GetContent()->RemoveSystemEventListener(u"mousedown"_ns,
mMediator, false);
thumbFrame->GetContent()->RemoveSystemEventListener(u"touchstart"_ns,
mMediator, false);
}
bool nsSliderFrame::ShouldScrollForEvent(WidgetGUIEvent* aEvent) {
switch (aEvent->mMessage) {
case eTouchStart:
case eTouchEnd:
return true;
case eMouseDown:
case eMouseUp: {
uint16_t button = aEvent->AsMouseEvent()->mButton;
#ifdef MOZ_WIDGET_GTK
return (button == MouseButton::ePrimary) ||
(button == MouseButton::eSecondary && GetScrollToClick()) ||
(button == MouseButton::eMiddle && gMiddlePref &&
!GetScrollToClick());
#else
return (button == MouseButton::ePrimary) ||
(button == MouseButton::eMiddle && gMiddlePref);
#endif
}
default:
return false;
}
}
bool nsSliderFrame::ShouldScrollToClickForEvent(WidgetGUIEvent* aEvent) {
if (!ShouldScrollForEvent(aEvent)) {
return false;
}
if (aEvent->mMessage != eMouseDown && aEvent->mMessage != eTouchStart) {
return false;
}
#if defined(XP_MACOSX) || defined(MOZ_WIDGET_GTK)
// On Mac and Linux, clicking the scrollbar thumb should never scroll to
// click.
if (IsEventOverThumb(aEvent)) {
return false;
}
#endif
if (aEvent->mMessage == eTouchStart) {
return GetScrollToClick();
}
WidgetMouseEvent* mouseEvent = aEvent->AsMouseEvent();
if (mouseEvent->mButton == MouseButton::ePrimary) {
#ifdef XP_MACOSX
bool invertPref = mouseEvent->IsAlt();
#else
bool invertPref = mouseEvent->IsShift();
#endif
return GetScrollToClick() != invertPref;
}
#ifdef MOZ_WIDGET_GTK
if (mouseEvent->mButton == MouseButton::eSecondary) {
return !GetScrollToClick();
}
#endif
return true;
}
bool nsSliderFrame::IsEventOverThumb(WidgetGUIEvent* aEvent) {
nsIFrame* thumbFrame = mFrames.FirstChild();
if (!thumbFrame) {
return false;
}
nsPoint eventPoint;
if (!GetEventPoint(aEvent, eventPoint)) {
return false;
}
nsRect thumbRect = thumbFrame->GetRect();
#if defined(MOZ_WIDGET_GTK)
/* Scrollbar track can have padding, so it's better to check that eventPoint
* is inside of actual thumb, not just its one axis. The part of the scrollbar
* track adjacent to thumb can actually receive events in GTK3 */
return eventPoint.x >= thumbRect.x && eventPoint.x < thumbRect.XMost() &&
eventPoint.y >= thumbRect.y && eventPoint.y < thumbRect.YMost();
#else
bool isHorizontal = IsXULHorizontal();
nscoord eventPos = isHorizontal ? eventPoint.x : eventPoint.y;
nscoord thumbStart = isHorizontal ? thumbRect.x : thumbRect.y;
nscoord thumbEnd = isHorizontal ? thumbRect.XMost() : thumbRect.YMost();
return eventPos >= thumbStart && eventPos < thumbEnd;
#endif
}
NS_IMETHODIMP
nsSliderFrame::HandlePress(nsPresContext* aPresContext, WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus) {
if (!ShouldScrollForEvent(aEvent) || ShouldScrollToClickForEvent(aEvent)) {
return NS_OK;
}
if (IsEventOverThumb(aEvent)) {
return NS_OK;
}
nsIFrame* thumbFrame = mFrames.FirstChild();
if (!thumbFrame) // display:none?
return NS_OK;
if (mContent->AsElement()->AttrValueIs(kNameSpaceID_None, nsGkAtoms::disabled,
nsGkAtoms::_true, eCaseMatters))
return NS_OK;
nsRect thumbRect = thumbFrame->GetRect();
nscoord change = 1;
nsPoint eventPoint;
if (!GetEventPoint(aEvent, eventPoint)) {
return NS_OK;
}
if (IsXULHorizontal() ? eventPoint.x < thumbRect.x
: eventPoint.y < thumbRect.y)
change = -1;
mChange = change;
DragThumb(true);
// On Linux we want to keep scrolling in the direction indicated by |change|
// until the mouse is released. On the other platforms we want to stop
// scrolling as soon as the scrollbar thumb has reached the current mouse
// position.
#ifdef MOZ_WIDGET_GTK
nsRect clientRect;
GetXULClientRect(clientRect);
// Set the destination point to the very end of the scrollbar so that
// scrolling doesn't stop halfway through.
if (change > 0) {
mDestinationPoint = nsPoint(clientRect.width, clientRect.height);
} else {
mDestinationPoint = nsPoint(0, 0);
}
#else
mDestinationPoint = eventPoint;
#endif
StartRepeat();
PageScroll(change);
return NS_OK;
}
NS_IMETHODIMP
nsSliderFrame::HandleRelease(nsPresContext* aPresContext,
WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus) {
StopRepeat();
nsIFrame* scrollbar = GetScrollbar();
nsScrollbarFrame* sb = do_QueryFrame(scrollbar);
if (sb) {
nsIScrollbarMediator* m = sb->GetScrollbarMediator();
if (m) {
m->ScrollbarReleased(sb);
}
}
return NS_OK;
}
void nsSliderFrame::DestroyFrom(nsIFrame* aDestructRoot,
PostDestroyData& aPostDestroyData) {
// tell our mediator if we have one we are gone.
if (mMediator) {
mMediator->SetSlider(nullptr);
mMediator = nullptr;
}
StopRepeat();
// call base class Destroy()
nsBoxFrame::DestroyFrom(aDestructRoot, aPostDestroyData);
}
nsSize nsSliderFrame::GetXULPrefSize(nsBoxLayoutState& aState) {
EnsureOrient();
return nsBoxFrame::GetXULPrefSize(aState);
}
nsSize nsSliderFrame::GetXULMinSize(nsBoxLayoutState& aState) {
EnsureOrient();
// our min size is just our borders and padding
return nsIFrame::GetUncachedXULMinSize(aState);
}
nsSize nsSliderFrame::GetXULMaxSize(nsBoxLayoutState& aState) {
EnsureOrient();
return nsBoxFrame::GetXULMaxSize(aState);
}
void nsSliderFrame::EnsureOrient() {
nsIFrame* scrollbarBox = GetScrollbar();
bool isHorizontal = scrollbarBox->HasAnyStateBits(NS_STATE_IS_HORIZONTAL);
if (isHorizontal)
AddStateBits(NS_STATE_IS_HORIZONTAL);
else
RemoveStateBits(NS_STATE_IS_HORIZONTAL);
}
void nsSliderFrame::Notify(void) {
bool stop = false;
nsIFrame* thumbFrame = mFrames.FirstChild();
if (!thumbFrame) {
StopRepeat();
return;
}
nsRect thumbRect = thumbFrame->GetRect();
bool isHorizontal = IsXULHorizontal();
// See if the thumb has moved past our destination point.
// if it has we want to stop.
if (isHorizontal) {
if (mChange < 0) {
if (thumbRect.x < mDestinationPoint.x) stop = true;
} else {
if (thumbRect.x + thumbRect.width > mDestinationPoint.x) stop = true;
}
} else {
if (mChange < 0) {
if (thumbRect.y < mDestinationPoint.y) stop = true;
} else {
if (thumbRect.y + thumbRect.height > mDestinationPoint.y) stop = true;
}
}
if (stop) {
StopRepeat();
} else {
PageScroll(mChange);
}
}
void nsSliderFrame::PageScroll(nscoord aChange) {
if (mContent->AsElement()->AttrValueIs(kNameSpaceID_None, nsGkAtoms::dir,
nsGkAtoms::reverse, eCaseMatters)) {
aChange = -aChange;
}
nsIFrame* scrollbar = GetScrollbar();
nsScrollbarFrame* sb = do_QueryFrame(scrollbar);
if (sb) {
nsIScrollbarMediator* m = sb->GetScrollbarMediator();
sb->SetIncrementToPage(aChange);
if (m) {
m->ScrollByPage(sb, aChange, nsIScrollbarMediator::ENABLE_SNAP);
return;
}
}
PageUpDown(aChange);
}
float nsSliderFrame::GetThumbRatio() const {
// mRatio is in thumb app units per scrolled css pixels. Convert it to a
// ratio of the thumb's CSS pixels per scrolled CSS pixels. (Note the thumb
// is in the scrollframe's parent's space whereas the scrolled CSS pixels
// are in the scrollframe's space).
return mRatio / mozilla::AppUnitsPerCSSPixel();
}
void nsSliderFrame::AsyncScrollbarDragInitiated(uint64_t aDragBlockId) {
mAPZDragInitiated = Some(aDragBlockId);
}
void nsSliderFrame::AsyncScrollbarDragRejected() {
mScrollingWithAPZ = false;
// Only suppress the displayport if we're still dragging the thumb.
// Otherwise, no one will unsuppress it.
if (isDraggingThumb()) {
SuppressDisplayport();
}
}
void nsSliderFrame::SuppressDisplayport() {
if (!mSuppressionActive) {
PresShell()->SuppressDisplayport(true);
mSuppressionActive = true;
}
}
void nsSliderFrame::UnsuppressDisplayport() {
if (mSuppressionActive) {
PresShell()->SuppressDisplayport(false);
mSuppressionActive = false;
}
}
bool nsSliderFrame::OnlySystemGroupDispatch(EventMessage aMessage) const {
// If we are in a native anonymous subtree, do not dispatch mouse-move events
// targeted at this slider frame to web content. This matches the behaviour
// of other browsers.
return aMessage == eMouseMove && isDraggingThumb() &&
GetContent()->IsInNativeAnonymousSubtree();
}
NS_IMPL_ISUPPORTS(nsSliderMediator, nsIDOMEventListener)
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