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Diffstat (limited to 'layout/xul/nsSliderFrame.cpp')
| -rw-r--r-- | layout/xul/nsSliderFrame.cpp | 1470 |
1 files changed, 1470 insertions, 0 deletions
diff --git a/layout/xul/nsSliderFrame.cpp b/layout/xul/nsSliderFrame.cpp new file mode 100644 index 0000000000..a83fc0bbc9 --- /dev/null +++ b/layout/xul/nsSliderFrame.cpp @@ -0,0 +1,1470 @@ +/* -*- 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/DisplayPortUtils.h" +#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 "mozilla/layers/ScrollInputMethods.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; +using mozilla::layers::ScrollInputMethod; + +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; + + mozilla::Telemetry::Accumulate( + mozilla::Telemetry::SCROLL_INPUT_METHODS, + (uint32_t)ScrollInputMethod::MainThreadScrollbarTrackClick); + + // 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; +} + +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 (!DisplayPortUtils::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 = false; + if (nsPresContext* presContext = presShell->GetPresContext()) { + waitForRefresh = presContext->RegisterOneShotPostRefreshObserver( + new OneShotPostRefreshObserver( + presShell, [widget = RefPtr<nsIWidget>(widget), dragMetrics]( + mozilla::PresShell*, OneShotPostRefreshObserver*) { + widget->StartAsyncScrollbarDrag(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); + + if (!mScrollingWithAPZ) { + // We record this one at the end of the drag rather than at the beginning + // because at the point that the main thread starts the drag (in StartDrag) + // it may not know for sure whether APZ or the main thread will end up + // handling the drag. Even if mScrollingWithAPZ is true initially, it + // may get set to false if APZ rejects the drag. But by the end of the drag + // the mScrollingWithAPZ flag should be correct and so we can use it here + // to determine if APZ or the main thread handled the drag. + mozilla::Telemetry::Accumulate( + mozilla::Telemetry::SCROLL_INPUT_METHODS, + (uint32_t)ScrollInputMethod::MainThreadScrollbarDrag); + } + + 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; + } + + mozilla::Telemetry::Accumulate( + mozilla::Telemetry::SCROLL_INPUT_METHODS, + (uint32_t)ScrollInputMethod::MainThreadScrollbarTrackClick); + + 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) |