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Bug 1896516 Part 13 - Remove nsIScrollableFrame completely. r=layout-reviewers,emilio

Browse Source 
This patch moves the documentation from `nsIScrollableFrame.h` to
`ScrollContainerFrame.h`. We keep methods in the original order as they were in
`nsIScrollableFrame`.

Differential Revision: https://phabricator.services.mozilla.com/D211500
This commit is contained in:
Ting-Yu Lin 2024-05-30 06:32:23 +00:00
parent 9960203793
commit b0f082c9cf
5 changed files with 628 additions and 816 deletions
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1
layout/generic/FrameClasses.py
View File

@ -187,7 +187,6 @@ FRAME_CLASSES = [
AbstractFrame("nsIMathMLFrame"),
AbstractFrame("nsIPercentBSizeObserver"),
AbstractFrame("nsIPopupContainer"),
AbstractFrame("nsIScrollableFrame"),
AbstractFrame("nsIScrollbarMediator"),
AbstractFrame("nsISelectControlFrame"),
AbstractFrame("nsIStatefulFrame"),

5
layout/generic/ScrollContainerFrame.cpp
View File

@ -1677,7 +1677,6 @@ a11y::AccType ScrollContainerFrame::AccessibleType() {
NS_QUERYFRAME_HEAD(ScrollContainerFrame)
NS_QUERYFRAME_ENTRY(nsIAnonymousContentCreator)
NS_QUERYFRAME_ENTRY(nsIScrollableFrame)
NS_QUERYFRAME_ENTRY(nsIStatefulFrame)
NS_QUERYFRAME_ENTRY(nsIScrollbarMediator)
NS_QUERYFRAME_ENTRY(ScrollContainerFrame)
@ -7237,7 +7236,7 @@ void ScrollContainerFrame::FireScrolledAreaEvent() {
}
}
ScrollDirections nsIScrollableFrame::GetAvailableScrollingDirections() const {
ScrollDirections ScrollContainerFrame::GetAvailableScrollingDirections() const {
nscoord oneDevPixel =
GetScrolledFrame()->PresContext()->AppUnitsPerDevPixel();
ScrollDirections directions;
@ -7681,7 +7680,7 @@ void ScrollContainerFrame::PostPendingResnap() {
PresShell()->PostPendingScrollResnap(this);
}
nsIScrollableFrame::PhysicalScrollSnapAlign
ScrollContainerFrame::PhysicalScrollSnapAlign
ScrollContainerFrame::GetScrollSnapAlignFor(const nsIFrame* aFrame) const {
StyleScrollSnapAlignKeyword alignForY = StyleScrollSnapAlignKeyword::None;
StyleScrollSnapAlignKeyword alignForX = StyleScrollSnapAlignKeyword::None;

792
layout/generic/ScrollContainerFrame.h
View File

@ -9,21 +9,22 @@
#ifndef mozilla_ScrollContainerFrame_h_
#define mozilla_ScrollContainerFrame_h_
#include "FrameMetrics.h"
#include "mozilla/Attributes.h"
#include "mozilla/dom/WindowBinding.h" // for mozilla::dom::ScrollBehavior
#include "mozilla/layout/ScrollAnchorContainer.h"
#include "mozilla/ScrollOrigin.h"
#include "mozilla/ScrollTypes.h"
#include "mozilla/TypedEnumBits.h"
#include "nsContainerFrame.h"
#include "nsExpirationTracker.h"
#include "nsIAnonymousContentCreator.h"
#include "nsIScrollableFrame.h"
#include "nsIReflowCallback.h"
#include "nsIScrollbarMediator.h"
#include "nsIStatefulFrame.h"
#include "nsThreadUtils.h"
#include "nsIReflowCallback.h"
#include "nsQueryFrame.h"
#include "nsExpirationTracker.h"
#include "nsThreadUtils.h"
#include "ScrollVelocityQueue.h"
#include "mozilla/ScrollTypes.h"
#include "mozilla/PresState.h"
#include "mozilla/layout/ScrollAnchorContainer.h"
#include "mozilla/TypedEnumBits.h"
class nsPresContext;
class nsIContent;
@ -34,9 +35,12 @@ class AutoContainsBlendModeCapturer;
namespace mozilla {
struct nsDisplayListCollection;
class PresShell;
class PresState;
enum class StyleScrollbarWidth : uint8_t;
class ScrollContainerFrame;
class ScrollPositionUpdate;
struct ScrollReflowInput;
struct ScrollStyles;
struct StyleScrollSnapAlign;
namespace layers {
class Layer;
@ -64,7 +68,7 @@ namespace mozilla {
* or remove the scrolled frame
*/
class ScrollContainerFrame : public nsContainerFrame,
public nsIScrollableFrame,
public nsIScrollbarMediator,
public nsIAnonymousContentCreator,
public nsIReflowCallback,
public nsIStatefulFrame {
@ -180,18 +184,47 @@ class ScrollContainerFrame : public nsContainerFrame,
nsresult CreateAnonymousContent(nsTArray<ContentInfo>&) final;
void AppendAnonymousContentTo(nsTArray<nsIContent*>&, uint32_t aFilter) final;
// nsIScrollableFrame
nsIFrame* GetScrolledFrame() const final { return mScrolledFrame; }
ScrollStyles GetScrollStyles() const final;
bool IsForTextControlWithNoScrollbars() const final;
bool HasAllNeededScrollbars() const final {
/**
* Get the frame for the content that we are scrolling within
* this scrollable frame.
*/
nsIFrame* GetScrolledFrame() const { return mScrolledFrame; }
/**
* Get the overflow styles (StyleOverflow::Scroll, StyleOverflow::Hidden, or
* StyleOverflow::Auto) governing the horizontal and vertical scrollbars for
* this frame.
*
* This is special because they can be propagated from the <body> element,
* unlike other styles.
*/
ScrollStyles GetScrollStyles() const;
/**
* Returns whether this scroll frame is for a text control element with no
* scrollbars (for <input>, basically).
*/
bool IsForTextControlWithNoScrollbars() const;
/**
* Returns whether we already have anonymous content nodes for all our needed
* scrollbar parts (or a superset thereof).
*/
bool HasAllNeededScrollbars() const {
return GetCurrentAnonymousContent().contains(GetNeededAnonymousContent());
}
layers::OverscrollBehaviorInfo GetOverscrollBehaviorInfo() const final;
layers::ScrollDirections GetAvailableScrollingDirectionsForUserInputEvents()
const final;
layers::ScrollDirections GetScrollbarVisibility() const final {
/**
* Get the overscroll-behavior styles.
*/
layers::OverscrollBehaviorInfo GetOverscrollBehaviorInfo() const;
/**
* Return the scrollbars which are visible. It's OK to call this during reflow
* of the scrolled contents, in which case it will reflect the current
* assumptions about scrollbar visibility.
*/
layers::ScrollDirections GetScrollbarVisibility() const {
layers::ScrollDirections result;
if (mHasHorizontalScrollbar) {
result += layers::ScrollDirection::eHorizontal;
@ -201,23 +234,96 @@ class ScrollContainerFrame : public nsContainerFrame,
}
return result;
}
/**
* Returns the directions in which scrolling is allowed (if the scroll range
* is at least one device pixel in that direction).
*/
layers::ScrollDirections GetAvailableScrollingDirections() const;
/**
* Returns the directions in which scrolling is allowed when taking into
* account the visual viewport size and overflow hidden. (An (apz) zoomed in
* overflow hidden scrollframe is actually user scrollable.)
*/
layers::ScrollDirections GetAvailableScrollingDirectionsForUserInputEvents()
const;
/**
* Return the actual sizes of all possible scrollbars. Returns 0 for scrollbar
* positions that don't have a scrollbar or where the scrollbar is not
* visible. Do not call this while this frame's descendants are being
* reflowed, it won't be accurate.
* INCLUDE_VISUAL_VIEWPORT_SCROLLBARS means we include the size of layout
* scrollbars that are only visible to scroll the visual viewport inside the
* layout viewport (ie the layout viewport cannot be scrolled) even though
* there is no layout space set aside for these scrollbars.
*/
enum class ScrollbarSizesOptions { NONE, INCLUDE_VISUAL_VIEWPORT_SCROLLBARS };
nsMargin GetActualScrollbarSizes(
ScrollbarSizesOptions aOptions = ScrollbarSizesOptions::NONE) const final;
nsMargin GetDesiredScrollbarSizes() const final;
static nscoord GetNonOverlayScrollbarSize(const nsPresContext*,
StyleScrollbarWidth);
nsSize GetLayoutSize() const final {
ScrollbarSizesOptions aOptions = ScrollbarSizesOptions::NONE) const;
/**
* Return the sizes of all scrollbars assuming that any scrollbars that could
* be visible due to overflowing content, are. This can be called during
* reflow of the scrolled contents.
*/
nsMargin GetDesiredScrollbarSizes() const;
/**
* Get the layout size of this frame.
* Note that this is a value which is not expanded by the minimum scale size.
* For scroll frames other than the root content document's scroll frame, this
* value will be the same as GetScrollPortRect().Size().
*
* This value is used for Element.clientWidth and clientHeight.
*/
nsSize GetLayoutSize() const {
if (mIsUsingMinimumScaleSize) {
return mICBSize;
}
return mScrollPort.Size();
}
nsRect GetScrolledRect() const final;
nsRect GetScrollPortRect() const final { return mScrollPort; }
nsPoint GetScrollPosition() const final {
/**
* GetScrolledRect is designed to encapsulate deciding which
* directions of overflow should be reachable by scrolling and which
* should not. Callers should NOT depend on it having any particular
* behavior.
*
* This should only be called when the scrolled frame has been
* reflowed with the scroll port size given in mScrollPort.
*
* Currently it allows scrolling down and to the right for
* ScrollContainerFrames with LTR directionality, and allows scrolling down
* and to the left for ScrollContainerFrames with RTL directionality.
*/
nsRect GetScrolledRect() const;
/**
* Get the area of the scrollport relative to the origin of this frame's
* border-box.
* This is the area of this frame minus border and scrollbars.
*/
nsRect GetScrollPortRect() const { return mScrollPort; }
/**
* Get the offset of the scrollport origin relative to the scrolled
* frame origin. Typically the position will be non-negative.
* This will always be a multiple of device pixels.
*/
nsPoint GetScrollPosition() const {
return mScrollPort.TopLeft() - mScrolledFrame->GetPosition();
}
nsPoint GetLogicalScrollPosition() const final {
/**
* For LTR frames, the logical scroll position is the offset of the top left
* corner of the frame from the top left corner of the scroll port (same as
* GetScrollPosition).
* For RTL frames, it is the offset of the top right corner of the frame from
* the top right corner of the scroll port.
*/
nsPoint GetLogicalScrollPosition() const {
nsPoint pt;
pt.x = IsPhysicalLTR()
? mScrollPort.x - mScrolledFrame->GetPosition().x
@ -226,50 +332,520 @@ class ScrollContainerFrame : public nsContainerFrame,
return pt;
}
nsRect GetScrollRange() const final { return GetLayoutScrollRange(); }
nsSize GetVisualViewportSize() const final;
nsPoint GetVisualViewportOffset() const final;
bool SetVisualViewportOffset(const nsPoint& aOffset, bool aRepaint) final;
nsRect GetVisualScrollRange() const final;
nsRect GetScrollRangeForUserInputEvents() const final;
nsSize GetLineScrollAmount() const final;
nsSize GetPageScrollAmount() const final;
nsMargin GetScrollPadding() const final;
/**
* Get the area that must contain the scroll position. Typically
* (but not always, e.g. for RTL content) x and y will be 0, and
* width or height will be nonzero if the content can be scrolled in
* that direction. Since scroll positions must be a multiple of
* device pixels, the range extrema will also be a multiple of
* device pixels.
*/
nsRect GetScrollRange() const { return GetLayoutScrollRange(); }
/**
* Get the size of the view port to use when clamping the scroll
* position.
*/
nsSize GetVisualViewportSize() const;
/**
* Returns the offset of the visual viewport relative to
* the origin of the scrolled content. Note that only the RCD-RSF
* has a distinct visual viewport; for other scroll frames, the
* visual viewport always coincides with the layout viewport, and
* consequently the offset this function returns is equal to
* GetScrollPosition().
*/
nsPoint GetVisualViewportOffset() const;
/**
* Set the visual viewport offset associated with a root scroll frame. This is
* only valid when called on a root scroll frame and will assert otherwise.
* aRepaint indicates if we need to ask for a main thread paint if this
* changes scrollbar positions or not. For example, if the compositor has
* already put the scrollbars at this position then they don't need to move so
* we can skip the repaint. Returns true if the offset changed and the scroll
* frame is still alive after this call.
*/
bool SetVisualViewportOffset(const nsPoint& aOffset, bool aRepaint);
/**
* Get the area that must contain the visual viewport offset.
*/
nsRect GetVisualScrollRange() const;
/**
* Like GetVisualScrollRange but also takes into account overflow: hidden.
*/
nsRect GetScrollRangeForUserInputEvents() const;
/**
* Return how much we would try to scroll by in each direction if
* asked to scroll by one "line" vertically and horizontally.
*/
nsSize GetLineScrollAmount() const;
/**
* Return how much we would try to scroll by in each direction if
* asked to scroll by one "page" vertically and horizontally.
*/
nsSize GetPageScrollAmount() const;
/**
* Return scroll-padding value of this frame.
*/
nsMargin GetScrollPadding() const;
/**
* @note This method might destroy the frame, pres shell and other objects.
* Clamps aScrollPosition to GetScrollRange and sets the scroll position
* to that value.
* @param aRange If non-null, specifies area which contains aScrollPosition
* and can be used for choosing a performance-optimized scroll position.
* Any point within this area can be chosen.
* The choosen point will be as close as possible to aScrollPosition.
*/
void ScrollTo(nsPoint aScrollPosition, ScrollMode aMode,
const nsRect* aRange = nullptr,
ScrollSnapFlags aSnapFlags = ScrollSnapFlags::Disabled,
ScrollTriggeredByScript aTriggeredByScript =
ScrollTriggeredByScript::No) final {
ScrollTriggeredByScript::No) {
return ScrollToInternal(aScrollPosition, aMode, ScrollOrigin::Other, aRange,
aSnapFlags, aTriggeredByScript);
}
/**
* @note This method might destroy the frame, pres shell and other objects.
*/
void ScrollToCSSPixels(const CSSIntPoint& aScrollPosition,
ScrollMode aMode = ScrollMode::Instant) final;
void ScrollToCSSPixelsForApz(const CSSPoint& aScrollPosition,
ScrollSnapTargetIds&& aLastSnapTargetIds) final;
/**
* @note This method might destroy the frame, pres shell and other objects.
*/
CSSIntPoint GetRoundedScrollPositionCSSPixels() final;
/**
* @note This method might destroy the frame, pres shell and other objects.
* Scrolls to a particular position in integer CSS pixels.
* Keeps the exact current horizontal or vertical position if the current
* position, rounded to CSS pixels, matches aScrollPosition. If
* aScrollPosition.x/y is different from the current CSS pixel position,
* makes sure we only move in the direction given by the difference.
*
* When aMode is SMOOTH, INSTANT, or NORMAL, GetRoundedScrollPositionCSSPixels
* (the scroll position after rounding to CSS pixels) will be exactly
* aScrollPosition at the end of the scroll animation.
*
* When aMode is SMOOTH_MSD, intermediate animation frames may be outside the
* range and / or moving in any direction; GetRoundedScrollPositionCSSPixels
* will be exactly aScrollPosition at the end of the scroll animation unless
* the SMOOTH_MSD animation is interrupted.
*/
void ScrollToCSSPixels(const CSSIntPoint& aScrollPosition,
ScrollMode aMode = ScrollMode::Instant);
/**
* @note This method might destroy the frame, pres shell and other objects.
* Scrolls to a particular position in float CSS pixels.
* This does not guarantee that GetRoundedScrollPositionCSSPixels equals
* aScrollPosition afterward. It tries to scroll as close to
* aScrollPosition as possible while scrolling by an integer
* number of layer pixels (so the operation is fast and looks clean).
*/
void ScrollToCSSPixelsForApz(const CSSPoint& aScrollPosition,
ScrollSnapTargetIds&& aLastSnapTargetIds);
/**
* Returns the scroll position in integer CSS pixels, rounded to the nearest
* pixel.
*/
CSSIntPoint GetRoundedScrollPositionCSSPixels();
/**
* Some platforms (OSX) may generate additional scrolling events even
* after the user has stopped scrolling, simulating a momentum scrolling
* effect resulting from fling gestures.
* SYNTHESIZED_MOMENTUM_EVENT indicates that the scrolling is being requested
* by such a synthesized event and may be ignored if another scroll has
* been started since the last actual user input.
*/
enum ScrollMomentum { NOT_MOMENTUM, SYNTHESIZED_MOMENTUM_EVENT };
/**
* @note This method might destroy the frame, pres shell and other objects.
* Modifies the current scroll position by aDelta units given by aUnit,
* clamping it to GetScrollRange. If WHOLE is specified as the unit,
* content is scrolled all the way in the direction(s) given by aDelta.
* @param aOverflow if non-null, returns the amount that scrolling
* was clamped by in each direction (how far we moved the scroll position
* to bring it back into the legal range). This is never negative. The
* values are in device pixels.
*/
void ScrollBy(nsIntPoint aDelta, ScrollUnit aUnit, ScrollMode aMode,
nsIntPoint* aOverflow = nullptr,
ScrollOrigin aOrigin = ScrollOrigin::NotSpecified,
ScrollMomentum aMomentum = NOT_MOMENTUM,
ScrollSnapFlags aSnapFlags = ScrollSnapFlags::Disabled) final;
ScrollSnapFlags aSnapFlags = ScrollSnapFlags::Disabled);
void ScrollByCSSPixels(const CSSIntPoint& aDelta,
ScrollMode aMode = ScrollMode::Instant) final {
ScrollMode aMode = ScrollMode::Instant) {
return ScrollByCSSPixelsInternal(aDelta, aMode);
}
/**
* Perform scroll snapping, possibly resulting in a smooth scroll to
* maintain the scroll snap position constraints. Velocity sampled from
* main thread scrolling is used to determine best matching snap point
* when called after a fling gesture on a trackpad or mouse wheel.
*/
void ScrollSnap() { return ScrollSnap(ScrollMode::SmoothMsd); }
/**
* @note This method might destroy the frame, pres shell and other objects.
* This tells the scroll frame to try scrolling to the scroll
* position that was restored from the history. This must be called
* at least once after state has been restored. It is called by the
* scrolled frame itself during reflow, but sometimes state can be
* restored after reflows are done...
* XXX should we take an aMode parameter here? Currently it's instant.
*/
void ScrollToRestoredPosition();
/**
* Add a scroll position listener. This listener must be removed
* before it is destroyed.
*/
void AddScrollPositionListener(nsIScrollPositionListener* aListener) {
mListeners.AppendElement(aListener);
}
/**
* Remove a scroll position listener.
*/
void RemoveScrollPositionListener(nsIScrollPositionListener* aListener) {
mListeners.RemoveElement(aListener);
}
/**
* @note This method might destroy the frame, pres shell and other objects.
* Internal method used by scrollbars to notify their scrolling
* container of changes.
*/
void CurPosAttributeChanged(nsIContent* aChild) {
return CurPosAttributeChangedInternal(aChild);
}
/**
* Allows the docshell to request that the scroll frame post an event
* after being restored from history.
*/
NS_IMETHOD PostScrolledAreaEventForCurrentArea() final {
PostScrolledAreaEvent();
return NS_OK;
}
/**
* Returns true if this scrollframe is being "actively scrolled".
* This basically means that we should allocate resources in the
* expectation that scrolling is going to happen.
*/
bool IsScrollingActive() const;
/**
* Returns true if this scroll frame might be scrolled
* asynchronously by the compositor.
*/
bool IsMaybeAsynchronouslyScrolled() const {
// If this is true, then we'll build an ASR, and that's what we want
// to know I think.
return mWillBuildScrollableLayer;
}
/**
* Was the current presentation state for this frame restored from history?
*/
bool DidHistoryRestore() const { return mDidHistoryRestore; }
/**
* Clear the flag so that DidHistoryRestore() returns false until the next
* RestoreState call.
* @see nsIStatefulFrame::RestoreState
*/
void ClearDidHistoryRestore() { mDidHistoryRestore = false; }
/**
* Mark the frame as having been scrolled at least once, so that it remains
* active and we can also start storing its scroll position when saving state.
*/
void MarkEverScrolled();
/**
* Determine if the passed in rect is nearly visible according to the frame
* visibility heuristics for how close it is to the visible scrollport.
*/
bool IsRectNearlyVisible(const nsRect& aRect) const;
/**
* Expand the given rect taking into account which directions we can scroll
* and how far we want to expand for frame visibility purposes.
*/
nsRect ExpandRectToNearlyVisible(const nsRect& aRect) const;
/**
* Returns the origin that triggered the last instant scroll. Will equal
* ScrollOrigin::Apz when the compositor's replica frame metrics includes the
* latest instant scroll.
*/
ScrollOrigin LastScrollOrigin() const { return mLastScrollOrigin; }
/**
* Gets the async scroll animation state of this scroll frame.
*
* There are five possible kinds that can overlap.
* MainThread means async scroll animated by the main thread.
* APZ scroll animations that are requested from the main thread go through
* three states: 1) pending, when the main thread has recorded that it wants
* apz to do a scroll animation, 2) requested, when the main thread has sent
* the request to the compositor (but it hasn't necessarily arrived yet), and
* 3) in progress, after apz has responded to the main thread that it got the
* request.
* TriggeredByScript means that the async scroll animation was triggered by
* script, e.g. Element.scrollTo().
*/
enum class AnimationState {
MainThread, // mAsyncScroll || mAsyncSmoothMSDScroll
APZPending, // mScrollUpdates.LastElement() is Smooth or SmoothMsd
APZRequested, // mApzAnimationRequested
APZInProgress, // mCurrentAPZScrollAnimationType !=
// APZScrollAniationType::No
TriggeredByScript // The animation was triggered with
// ScrollTriggeredByScript::Yes
};
EnumSet<AnimationState> ScrollAnimationState() const;
/**
* Returns the current generation counter for the scrollframe. This counter
* increments every time the scroll position is set.
*/
MainThreadScrollGeneration CurrentScrollGeneration() const {
return mScrollGeneration;
}
/**
* The APZ scroll generation associated with the last APZ scroll offset for
* which we processed a repaint request.
*/
APZScrollGeneration ScrollGenerationOnApz() const {
return mScrollGenerationOnApz;
}
/**
* LastScrollDestination returns the destination of the most recently
* requested smooth scroll animation.
*/
nsPoint LastScrollDestination() { return mDestination; }
/**
* Returns the list of scroll position updates since the last call to
* NotifyApzTransaction().
*/
nsTArray<ScrollPositionUpdate> GetScrollUpdates() const;
/**
* Returns true if the scroll frame has any scroll position updates since
* the last call to NotifyApzTransaction().
*/
bool HasScrollUpdates() const { return !mScrollUpdates.IsEmpty(); }
/**
* Clears the "origin of last scroll" property stored in this frame, if
* the generation counter passed in matches the current scroll generation
* counter, and clears the "origin of last smooth scroll" property if the
* generation counter matches. It also resets whether there's an ongoing apz
* animation.
*/
enum class InScrollingGesture : bool { No, Yes };
void ResetScrollInfoIfNeeded(const MainThreadScrollGeneration& aGeneration,
const APZScrollGeneration& aGenerationOnApz,
APZScrollAnimationType aAPZScrollAnimationType,
InScrollingGesture aInScrollingGesture);
/**
* Determine whether it is desirable to be able to asynchronously scroll this
* scroll frame.
*/
bool WantAsyncScroll() const;
/**
* Returns the ScrollMetadata contributed by this frame, if there is one.
*/
Maybe<layers::ScrollMetadata> ComputeScrollMetadata(
layers::WebRenderLayerManager* aLayerManager, const nsIFrame* aItemFrame,
const nsPoint& aOffsetToReferenceFrame) const;
/**
* Mark the scrollbar frames for reflow.
*/
void MarkScrollbarsDirtyForReflow() const;
/**
* Invalidate the scrollbar after the marks have been changed.
*/
void InvalidateScrollbars() const;
/**
* @note This method might destroy the frame, pres shell and other objects.
* Update scrollbar curpos attributes to reflect current scroll position
*/
void UpdateScrollbarPosition();
void SetTransformingByAPZ(bool aTransforming);
bool IsTransformingByAPZ() const { return mTransformingByAPZ; }
/**
* Notify this scroll frame that it can be scrolled by APZ. In particular,
* this is called *after* the APZ code has created an APZC for this scroll
* frame and verified that it is not a scrollinfo layer. Therefore, setting an
* async transform on it is actually user visible.
*/
void SetScrollableByAPZ(bool aScrollable);
/**
* Notify this scroll frame that it can be zoomed by APZ.
*/
void SetZoomableByAPZ(bool aZoomable);
/**
* Mark this scroll frame as having out-of-flow content inside a CSS filter.
* Such content will move incorrectly during async-scrolling; to mitigate
* this, paint skipping is disabled for such scroll frames.
*/
void SetHasOutOfFlowContentInsideFilter();
/**
* Determine if we should build a scrollable layer for this scroll frame and
* return the result. It will also record this result on the scroll frame.
* Pass the visible rect in aVisibleRect. On return it will be set to the
* displayport if there is one.
* Pass the dirty rect in aDirtyRect. On return it will be set to the
* dirty rect inside the displayport (ie the dirty rect that should be used).
* This function will set the display port base rect if aSetBase is true.
* aSetBase is only allowed to be false if there has been a call with it
* set to true before on the same paint.
*/
bool DecideScrollableLayer(nsDisplayListBuilder* aBuilder,
nsRect* aVisibleRect, nsRect* aDirtyRect,
bool aSetBase) {
return DecideScrollableLayer(aBuilder, aVisibleRect, aDirtyRect, aSetBase,
nullptr);
}
/**
* Notify the scrollframe that the current scroll offset and origin have been
* sent over in a layers transaction.
*
* This sets a flag on the scrollframe that indicates subsequent changes
* to the scroll position by "weaker" origins are permitted to overwrite the
* the scroll origin. Scroll origins that
* nsLayoutUtils::CanScrollOriginClobberApz returns false for are considered
* "weaker" than scroll origins for which that function returns true.
*
* This function must be called for a scrollframe after all calls to
* ComputeScrollMetadata in a layers transaction have been completed.
*
*/
void NotifyApzTransaction();
/**
* Notification that this scroll frame is getting its frame visibility
* updated. aIgnoreDisplayPort indicates that the display port was ignored
* (because there was no suitable base rect)
*/
void NotifyApproximateFrameVisibilityUpdate(bool aIgnoreDisplayPort);
/**
* Returns true if this scroll frame had a display port at the last frame
* visibility update and fills in aDisplayPort with that displayport. Returns
* false otherwise, and doesn't touch aDisplayPort.
*/
bool GetDisplayPortAtLastApproximateFrameVisibilityUpdate(
nsRect* aDisplayPort);
/**
* This is called when a descendant scrollframe's has its displayport expired.
* This function will check to see if this scrollframe may safely expire its
* own displayport and schedule a timer to do that if it is safe.
*/
void TriggerDisplayPortExpiration();
/**
* Returns information required to determine where to snap to after a scroll.
*/
ScrollSnapInfo GetScrollSnapInfo();
void TryResnap();
/**
* Post a pending re-snap request if the given |aFrame| is one of the snap
* points on the last scroll operation.
*/
void PostPendingResnapIfNeeded(const nsIFrame* aFrame);
void PostPendingResnap();
/**
* Returns a pair of the scroll-snap-align property value both on X and Y axes
* for the given |aFrame| considering the scroll-snap-type of this scroll
* container. For example, if the scroll-snap-type is `none`, the pair of
* scroll-snap-align is also `none none`.
*/
using PhysicalScrollSnapAlign =
std::pair<StyleScrollSnapAlignKeyword, StyleScrollSnapAlignKeyword>;
PhysicalScrollSnapAlign GetScrollSnapAlignFor(const nsIFrame* aFrame) const;
/**
* Given the drag event aEvent, determine whether the mouse is near the edge
* of the scrollable area, and scroll the view in the direction of that edge
* if so. If scrolling occurred, true is returned. When false is returned, the
* caller should look for an ancestor to scroll.
*/
bool DragScroll(WidgetEvent* aEvent);
void AsyncScrollbarDragInitiated(uint64_t aDragBlockId,
layers::ScrollDirection aDirection);
void AsyncScrollbarDragRejected();
/**
* Returns whether this scroll frame is the root scroll frame of the document
* that it is in. Note that some documents don't have root scroll frames at
* all (ie XUL documents) even though they may contain other scroll frames.
*/
bool IsRootScrollFrameOfDocument() const { return mIsRoot; }
/**
* Returns the paint sequence number if this scroll frame was the first
* scrollable frame for the paint.
*/
Maybe<uint32_t> IsFirstScrollableFrameSequenceNumber() const {
return mIsFirstScrollableFrameSequenceNumber;
}
/**
* Set the paint sequence number for the paint in which this was the first
* scrollable frame that was encountered.
*/
void SetIsFirstScrollableFrameSequenceNumber(Maybe<uint32_t> aValue) {
mIsFirstScrollableFrameSequenceNumber = aValue;
}
/**
* Returns the scroll anchor associated with this scrollable frame. This is
* never null.
*/
const ScrollAnchorContainer* Anchor() const { return &mAnchor; }
ScrollAnchorContainer* Anchor() { return &mAnchor; }
bool SmoothScrollVisual(
const nsPoint& aVisualViewportOffset,
layers::FrameMetrics::ScrollOffsetUpdateType aUpdateType);
/**
* Returns true if this scroll frame should perform smooth scroll with the
* given |aBehavior|.
*/
bool IsSmoothScroll(
dom::ScrollBehavior aBehavior = dom::ScrollBehavior::Auto) const;
static nscoord GetNonOverlayScrollbarSize(const nsPresContext*,
StyleScrollbarWidth);
void ScrollByCSSPixelsInternal(
const CSSIntPoint& aDelta, ScrollMode aMode = ScrollMode::Instant,
// This ScrollByCSSPixels is mainly used for Element.scrollBy and
@ -278,73 +854,6 @@ class ScrollContainerFrame : public nsContainerFrame,
ScrollSnapFlags aSnapFlags = ScrollSnapFlags::IntendedDirection |
ScrollSnapFlags::IntendedEndPosition);
void ScrollSnap() final { return ScrollSnap(ScrollMode::SmoothMsd); }
/**
* @note This method might destroy the frame, pres shell and other objects.
*/
void ScrollToRestoredPosition() final;
/**
* @note This method might destroy the frame, pres shell and other objects.
*/
void CurPosAttributeChanged(nsIContent* aChild) final {
return CurPosAttributeChangedInternal(aChild);
}
NS_IMETHOD PostScrolledAreaEventForCurrentArea() final {
PostScrolledAreaEvent();
return NS_OK;
}
bool IsScrollingActive() const final;
bool IsMaybeAsynchronouslyScrolled() const final {
// If this is true, then we'll build an ASR, and that's what we want
// to know I think.
return mWillBuildScrollableLayer;
}
bool DidHistoryRestore() const final { return mDidHistoryRestore; }
void ClearDidHistoryRestore() final { mDidHistoryRestore = false; }
void MarkEverScrolled() final;
bool IsRectNearlyVisible(const nsRect& aRect) const final;
nsRect ExpandRectToNearlyVisible(const nsRect& aRect) const final;
ScrollOrigin LastScrollOrigin() const final { return mLastScrollOrigin; }
EnumSet<AnimationState> ScrollAnimationState() const final;
MainThreadScrollGeneration CurrentScrollGeneration() const final {
return mScrollGeneration;
}
APZScrollGeneration ScrollGenerationOnApz() const final {
return mScrollGenerationOnApz;
}
nsPoint LastScrollDestination() final { return mDestination; }
nsTArray<ScrollPositionUpdate> GetScrollUpdates() const final;
bool HasScrollUpdates() const final { return !mScrollUpdates.IsEmpty(); }
void ResetScrollInfoIfNeeded(const MainThreadScrollGeneration& aGeneration,
const APZScrollGeneration& aGenerationOnApz,
APZScrollAnimationType aAPZScrollAnimationType,
InScrollingGesture aInScrollingGesture) final;
bool WantAsyncScroll() const final;
Maybe<layers::ScrollMetadata> ComputeScrollMetadata(
layers::WebRenderLayerManager* aLayerManager, const nsIFrame* aItemFrame,
const nsPoint& aOffsetToReferenceFrame) const final;
void MarkScrollbarsDirtyForReflow() const final;
void InvalidateScrollbars() const final;
/**
* @note This method might destroy the frame, pres shell and other objects.
* Update scrollbar curpos attributes to reflect current scroll position
*/
void UpdateScrollbarPosition() final;
bool DecideScrollableLayer(nsDisplayListBuilder* aBuilder,
nsRect* aVisibleRect, nsRect* aDirtyRect,
bool aSetBase) final {
return DecideScrollableLayer(aBuilder, aVisibleRect, aDirtyRect, aSetBase,
nullptr);
}
void NotifyApzTransaction() final;
void NotifyApproximateFrameVisibilityUpdate(bool aIgnoreDisplayPort) final;
bool GetDisplayPortAtLastApproximateFrameVisibilityUpdate(
nsRect* aDisplayPort) final;
void TriggerDisplayPortExpiration() final;
// nsIStatefulFrame
UniquePtr<PresState> SaveState() final;
NS_IMETHOD RestoreState(PresState* aState) final;
@ -369,60 +878,18 @@ class ScrollContainerFrame : public nsContainerFrame,
nsScrollbarFrame* GetScrollbarBox(bool aVertical) final {
return aVertical ? mVScrollbarBox : mHScrollbarBox;
}
void ScrollbarActivityStarted() const final;
void ScrollbarActivityStopped() const final;
bool IsScrollbarOnRight() const final;
bool ShouldSuppressScrollbarRepaints() const final {
return mSuppressScrollbarRepaints;
}
void SetTransformingByAPZ(bool aTransforming) final;
bool IsTransformingByAPZ() const final { return mTransformingByAPZ; }
void SetScrollableByAPZ(bool aScrollable) final;
void SetZoomableByAPZ(bool aZoomable) final;
void SetHasOutOfFlowContentInsideFilter() final;
ScrollSnapInfo GetScrollSnapInfo() final;
void TryResnap() final;
void PostPendingResnapIfNeeded(const nsIFrame* aFrame) final;
void PostPendingResnap() final;
PhysicalScrollSnapAlign GetScrollSnapAlignFor(
const nsIFrame* aFrame) const final;
bool DragScroll(WidgetEvent* aEvent) final;
void AsyncScrollbarDragInitiated(uint64_t aDragBlockId,
layers::ScrollDirection aDirection) final;
void AsyncScrollbarDragRejected() final;
bool IsRootScrollFrameOfDocument() const final { return mIsRoot; }
Maybe<uint32_t> IsFirstScrollableFrameSequenceNumber() const final {
return mIsFirstScrollableFrameSequenceNumber;
}
void SetIsFirstScrollableFrameSequenceNumber(Maybe<uint32_t> aValue) final {
mIsFirstScrollableFrameSequenceNumber = aValue;
}
const ScrollAnchorContainer* Anchor() const final { return &mAnchor; }
ScrollAnchorContainer* Anchor() final { return &mAnchor; }
// Return the scrolled frame.
void AppendDirectlyOwnedAnonBoxes(nsTArray<OwnedAnonBox>& aResult) final {
aResult.AppendElement(OwnedAnonBox(GetScrolledFrame()));
}
bool SmoothScrollVisual(
const nsPoint& aVisualViewportOffset,
layers::FrameMetrics::ScrollOffsetUpdateType aUpdateType) final;
bool IsSmoothScroll(
dom::ScrollBehavior aBehavior = dom::ScrollBehavior::Auto) const final;
#ifdef DEBUG_FRAME_DUMP
nsresult GetFrameName(nsAString& aResult) const override;
#endif
@ -482,13 +949,6 @@ class ScrollContainerFrame : public nsContainerFrame,
bool NeedsResnap();
void SetLastSnapTargetIds(UniquePtr<ScrollSnapTargetIds> aId);
void AddScrollPositionListener(nsIScrollPositionListener* aListener) final {
mListeners.AppendElement(aListener);
}
void RemoveScrollPositionListener(
nsIScrollPositionListener* aListener) final {
mListeners.RemoveElement(aListener);
}
static void SetScrollbarVisibility(nsIFrame* aScrollbar, bool aVisible);

1
layout/generic/moz.build
View File

@ -106,7 +106,6 @@ EXPORTS += [
"nsIFrameInlines.h",
"nsILineIterator.h",
"nsIntervalSet.h",
"nsIScrollableFrame.h",
"nsIScrollPositionListener.h",
"nsIStatefulFrame.h",
"nsLineBox.h",

645
layout/generic/nsIScrollableFrame.h
View File

@ -1,645 +0,0 @@
/* -*- 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/. */
/*
* interface that provides scroll APIs implemented by scrollable frames
*/
#ifndef nsIScrollFrame_h___
#define nsIScrollFrame_h___
#include "nsCoord.h"
#include "mozilla/dom/WindowBinding.h" // for mozilla::dom::ScrollBehavior
#include "mozilla/Maybe.h"
#include "mozilla/ScrollOrigin.h"
#include "mozilla/ScrollPositionUpdate.h"
#include "mozilla/ScrollStyles.h"
#include "mozilla/ScrollTypes.h"
#include "mozilla/gfx/Point.h"
#include "nsIScrollbarMediator.h"
#include "Units.h"
#include "FrameMetrics.h"
class gfxContext;
class nsIScrollPositionListener;
class nsIFrame;
class nsPresContext;
class nsIContent;
namespace mozilla {
class DisplayItemClip;
class nsDisplayListBuilder;
enum class StyleScrollSnapAlignKeyword : uint8_t;
namespace layers {
struct ScrollMetadata;
class Layer;
class WebRenderLayerManager;
} // namespace layers
namespace layout {
class ScrollAnchorContainer;
} // namespace layout
} // namespace mozilla
/**
* Interface for frames that are scrollable. This interface exposes
* APIs for examining scroll state, observing changes to scroll state,
* and triggering scrolling.
*/
class nsIScrollableFrame : public nsIScrollbarMediator {
public:
using CSSIntPoint = mozilla::CSSIntPoint;
using ScrollSnapInfo = mozilla::ScrollSnapInfo;
using ScrollAnchorContainer = mozilla::layout::ScrollAnchorContainer;
using ScrollMode = mozilla::ScrollMode;
using ScrollOrigin = mozilla::ScrollOrigin;
using PhysicalScrollSnapAlign =
std::pair<mozilla::StyleScrollSnapAlignKeyword,
mozilla::StyleScrollSnapAlignKeyword>;
NS_DECL_QUERYFRAME_TARGET(nsIScrollableFrame)
/**
* Get the frame for the content that we are scrolling within
* this scrollable frame.
*/
virtual nsIFrame* GetScrolledFrame() const = 0;
/**
* Get the overflow styles (StyleOverflow::Scroll, StyleOverflow::Hidden, or
* StyleOverflow::Auto) governing the horizontal and vertical scrollbars for
* this frame.
*
* This is special because they can be propagated from the <body> element,
* unlike other styles.
*/
virtual mozilla::ScrollStyles GetScrollStyles() const = 0;
/**
* Returns whether this scroll frame is for a text control element with no
* scrollbars (for <input>, basically).
*/
virtual bool IsForTextControlWithNoScrollbars() const = 0;
/**
* Returns whether we already have anonymous content nodes for all our needed
* scrollbar parts (or a superset thereof).
*/
virtual bool HasAllNeededScrollbars() const = 0;
/**
* Get the overscroll-behavior styles.
*/
virtual mozilla::layers::OverscrollBehaviorInfo GetOverscrollBehaviorInfo()
const = 0;
/**
* Return the scrollbars which are visible. It's OK to call this during reflow
* of the scrolled contents, in which case it will reflect the current
* assumptions about scrollbar visibility.
*/
virtual mozilla::layers::ScrollDirections GetScrollbarVisibility() const = 0;
/**
* Returns the directions in which scrolling is allowed (if the scroll range
* is at least one device pixel in that direction).
*/
mozilla::layers::ScrollDirections GetAvailableScrollingDirections() const;
/**
* Returns the directions in which scrolling is allowed when taking into
* account the visual viewport size and overflow hidden. (An (apz) zoomed in
* overflow hidden scrollframe is actually user scrollable.)
*/
virtual mozilla::layers::ScrollDirections
GetAvailableScrollingDirectionsForUserInputEvents() const = 0;
/**
* Return the actual sizes of all possible scrollbars. Returns 0 for scrollbar
* positions that don't have a scrollbar or where the scrollbar is not
* visible. Do not call this while this frame's descendants are being
* reflowed, it won't be accurate.
* INCLUDE_VISUAL_VIEWPORT_SCROLLBARS means we include the size of layout
* scrollbars that are only visible to scroll the visual viewport inside the
* layout viewport (ie the layout viewport cannot be scrolled) even though
* there is no layout space set aside for these scrollbars.
*/
enum class ScrollbarSizesOptions { NONE, INCLUDE_VISUAL_VIEWPORT_SCROLLBARS };
virtual nsMargin GetActualScrollbarSizes(
ScrollbarSizesOptions aOptions = ScrollbarSizesOptions::NONE) const = 0;
/**
* Return the sizes of all scrollbars assuming that any scrollbars that could
* be visible due to overflowing content, are. This can be called during
* reflow of the scrolled contents.
*/
virtual nsMargin GetDesiredScrollbarSizes() const = 0;
/**
* Get the layout size of this frame.
* Note that this is a value which is not expanded by the minimum scale size.
* For scroll frames other than the root content document's scroll frame, this
* value will be the same as GetScrollPortRect().Size().
*
* This value is used for Element.clientWidth and clientHeight.
*/
virtual nsSize GetLayoutSize() const = 0;
/**
* GetScrolledRect is designed to encapsulate deciding which
* directions of overflow should be reachable by scrolling and which
* should not. Callers should NOT depend on it having any particular
* behavior.
*
* This should only be called when the scrolled frame has been
* reflowed with the scroll port size given in mScrollPort.
*
* Currently it allows scrolling down and to the right for
* ScrollContainerFrames with LTR directionality, and allows scrolling down
* and to the left for ScrollContainerFrames with RTL directionality.
*/
virtual nsRect GetScrolledRect() const = 0;
/**
* Get the area of the scrollport relative to the origin of this frame's
* border-box.
* This is the area of this frame minus border and scrollbars.
*/
virtual nsRect GetScrollPortRect() const = 0;
/**
* Get the offset of the scrollport origin relative to the scrolled
* frame origin. Typically the position will be non-negative.
* This will always be a multiple of device pixels.
*/
virtual nsPoint GetScrollPosition() const = 0;
/**
* For LTR frames, the logical scroll position is the offset of the top left
* corner of the frame from the top left corner of the scroll port (same as
* GetScrollPosition).
* For RTL frames, it is the offset of the top right corner of the frame from
* the top right corner of the scroll port.
*/
virtual nsPoint GetLogicalScrollPosition() const = 0;
/**
* Get the area that must contain the scroll position. Typically
* (but not always, e.g. for RTL content) x and y will be 0, and
* width or height will be nonzero if the content can be scrolled in
* that direction. Since scroll positions must be a multiple of
* device pixels, the range extrema will also be a multiple of
* device pixels.
*/
virtual nsRect GetScrollRange() const = 0;
/**
* Get the size of the view port to use when clamping the scroll
* position.
*/
virtual nsSize GetVisualViewportSize() const = 0;
/**
* Returns the offset of the visual viewport relative to
* the origin of the scrolled content. Note that only the RCD-RSF
* has a distinct visual viewport; for other scroll frames, the
* visual viewport always coincides with the layout viewport, and
* consequently the offset this function returns is equal to
* GetScrollPosition().
*/
virtual nsPoint GetVisualViewportOffset() const = 0;
/**
* Set the visual viewport offset associated with a root scroll frame. This is
* only valid when called on a root scroll frame and will assert otherwise.
* aRepaint indicates if we need to ask for a main thread paint if this
* changes scrollbar positions or not. For example, if the compositor has
* already put the scrollbars at this position then they don't need to move so
* we can skip the repaint. Returns true if the offset changed and the scroll
* frame is still alive after this call.
*/
virtual bool SetVisualViewportOffset(const nsPoint& aOffset,
bool aRepaint) = 0;
/**
* Get the area that must contain the visual viewport offset.
*/
virtual nsRect GetVisualScrollRange() const = 0;
/**
* Like GetVisualScrollRange but also takes into account overflow: hidden.
*/
virtual nsRect GetScrollRangeForUserInputEvents() const = 0;
/**
* Return how much we would try to scroll by in each direction if
* asked to scroll by one "line" vertically and horizontally.
*/
virtual nsSize GetLineScrollAmount() const = 0;
/**
* Return how much we would try to scroll by in each direction if
* asked to scroll by one "page" vertically and horizontally.
*/
virtual nsSize GetPageScrollAmount() const = 0;
/**
* Return scroll-padding value of this frame.
*/
virtual nsMargin GetScrollPadding() const = 0;
/**
* Some platforms (OSX) may generate additional scrolling events even
* after the user has stopped scrolling, simulating a momentum scrolling
* effect resulting from fling gestures.
* SYNTHESIZED_MOMENTUM_EVENT indicates that the scrolling is being requested
* by such a synthesized event and may be ignored if another scroll has
* been started since the last actual user input.
*/
enum ScrollMomentum { NOT_MOMENTUM, SYNTHESIZED_MOMENTUM_EVENT };
/**
* @note This method might destroy the frame, pres shell and other objects.
* Clamps aScrollPosition to GetScrollRange and sets the scroll position
* to that value.
* @param aRange If non-null, specifies area which contains aScrollPosition
* and can be used for choosing a performance-optimized scroll position.
* Any point within this area can be chosen.
* The choosen point will be as close as possible to aScrollPosition.
*/
virtual void ScrollTo(
nsPoint aScrollPosition, ScrollMode aMode, const nsRect* aRange = nullptr,
mozilla::ScrollSnapFlags aSnapFlags = mozilla::ScrollSnapFlags::Disabled,
mozilla::ScrollTriggeredByScript aTriggeredByScript =
mozilla::ScrollTriggeredByScript::No) = 0;
/**
* @note This method might destroy the frame, pres shell and other objects.
* Scrolls to a particular position in integer CSS pixels.
* Keeps the exact current horizontal or vertical position if the current
* position, rounded to CSS pixels, matches aScrollPosition. If
* aScrollPosition.x/y is different from the current CSS pixel position,
* makes sure we only move in the direction given by the difference.
*
* When aMode is SMOOTH, INSTANT, or NORMAL, GetRoundedScrollPositionCSSPixels
* (the scroll position after rounding to CSS pixels) will be exactly
* aScrollPosition at the end of the scroll animation.
*
* When aMode is SMOOTH_MSD, intermediate animation frames may be outside the
* range and / or moving in any direction; GetRoundedScrollPositionCSSPixels
* will be exactly aScrollPosition at the end of the scroll animation unless
* the SMOOTH_MSD animation is interrupted.
*/
virtual void ScrollToCSSPixels(const CSSIntPoint& aScrollPosition,
ScrollMode aMode = ScrollMode::Instant) = 0;
/**
* @note This method might destroy the frame, pres shell and other objects.
* Scrolls to a particular position in float CSS pixels.
* This does not guarantee that GetRoundedScrollPositionCSSPixels equals
* aScrollPosition afterward. It tries to scroll as close to
* aScrollPosition as possible while scrolling by an integer
* number of layer pixels (so the operation is fast and looks clean).
*/
virtual void ScrollToCSSPixelsForApz(
const mozilla::CSSPoint& aScrollPosition,
mozilla::ScrollSnapTargetIds&& aLastSnapTargetIds) = 0;
/**
* Returns the scroll position in integer CSS pixels, rounded to the nearest
* pixel.
*/
virtual CSSIntPoint GetRoundedScrollPositionCSSPixels() = 0;
/**
* @note This method might destroy the frame, pres shell and other objects.
* Modifies the current scroll position by aDelta units given by aUnit,
* clamping it to GetScrollRange. If WHOLE is specified as the unit,
* content is scrolled all the way in the direction(s) given by aDelta.
* @param aOverflow if non-null, returns the amount that scrolling
* was clamped by in each direction (how far we moved the scroll position
* to bring it back into the legal range). This is never negative. The
* values are in device pixels.
*/
virtual void ScrollBy(nsIntPoint aDelta, mozilla::ScrollUnit aUnit,
ScrollMode aMode, nsIntPoint* aOverflow = nullptr,
ScrollOrigin aOrigin = ScrollOrigin::NotSpecified,
ScrollMomentum aMomentum = NOT_MOMENTUM,
mozilla::ScrollSnapFlags aSnapFlags =
mozilla::ScrollSnapFlags::Disabled) = 0;
virtual void ScrollByCSSPixels(const CSSIntPoint& aDelta,
ScrollMode aMode = ScrollMode::Instant) = 0;
/**
* Perform scroll snapping, possibly resulting in a smooth scroll to
* maintain the scroll snap position constraints. Velocity sampled from
* main thread scrolling is used to determine best matching snap point
* when called after a fling gesture on a trackpad or mouse wheel.
*/
virtual void ScrollSnap() = 0;
/**
* @note This method might destroy the frame, pres shell and other objects.
* This tells the scroll frame to try scrolling to the scroll
* position that was restored from the history. This must be called
* at least once after state has been restored. It is called by the
* scrolled frame itself during reflow, but sometimes state can be
* restored after reflows are done...
* XXX should we take an aMode parameter here? Currently it's instant.
*/
virtual void ScrollToRestoredPosition() = 0;
/**
* Add a scroll position listener. This listener must be removed
* before it is destroyed.
*/
virtual void AddScrollPositionListener(
nsIScrollPositionListener* aListener) = 0;
/**
* Remove a scroll position listener.
*/
virtual void RemoveScrollPositionListener(
nsIScrollPositionListener* aListener) = 0;
/**
* Internal method used by scrollbars to notify their scrolling
* container of changes.
*/
virtual void CurPosAttributeChanged(nsIContent* aChild) = 0;
/**
* Allows the docshell to request that the scroll frame post an event
* after being restored from history.
*/
NS_IMETHOD PostScrolledAreaEventForCurrentArea() = 0;
/**
* Returns true if this scrollframe is being "actively scrolled".
* This basically means that we should allocate resources in the
* expectation that scrolling is going to happen.
*/
virtual bool IsScrollingActive() const = 0;
/**
* Returns true if this scroll frame might be scrolled
* asynchronously by the compositor.
*/
virtual bool IsMaybeAsynchronouslyScrolled() const = 0;
/**
* Was the current presentation state for this frame restored from history?
*/
virtual bool DidHistoryRestore() const = 0;
/**
* Clear the flag so that DidHistoryRestore() returns false until the next
* RestoreState call.
* @see nsIStatefulFrame::RestoreState
*/
virtual void ClearDidHistoryRestore() = 0;
/**
* Mark the frame as having been scrolled at least once, so that it remains
* active and we can also start storing its scroll position when saving state.
*/
virtual void MarkEverScrolled() = 0;
/**
* Determine if the passed in rect is nearly visible according to the frame
* visibility heuristics for how close it is to the visible scrollport.
*/
virtual bool IsRectNearlyVisible(const nsRect& aRect) const = 0;
/**
* Expand the given rect taking into account which directions we can scroll
* and how far we want to expand for frame visibility purposes.
*/
virtual nsRect ExpandRectToNearlyVisible(const nsRect& aRect) const = 0;
/**
* Returns the origin that triggered the last instant scroll. Will equal
* ScrollOrigin::Apz when the compositor's replica frame metrics includes the
* latest instant scroll.
*/
virtual ScrollOrigin LastScrollOrigin() const = 0;
/**
* Gets the async scroll animation state of this scroll frame.
*
* There are five possible kinds that can overlap.
* MainThread means async scroll animated by the main thread.
* APZ scroll animations that are requested from the main thread go through
* three states: 1) pending, when the main thread has recorded that it wants
* apz to do a scroll animation, 2) requested, when the main thread has sent
* the request to the compositor (but it hasn't necessarily arrived yet), and
* 3) in progress, after apz has responded to the main thread that it got the
* request.
* TriggeredByScript means that the async scroll animation was triggered by
* script, e.g. Element.scrollTo().
*/
enum class AnimationState {
MainThread, // mAsyncScroll || mAsyncSmoothMSDScroll
APZPending, // mScrollUpdates.LastElement() is Smooth or SmoothMsd
APZRequested, // mApzAnimationRequested
APZInProgress, // mCurrentAPZScrollAnimationType !=
// APZScrollAniationType::No
TriggeredByScript // The animation was triggered with
// ScrollTriggeredByScript::Yes
};
virtual mozilla::EnumSet<AnimationState> ScrollAnimationState() const = 0;
/**
* Returns the current generation counter for the scrollframe. This counter
* increments every time the scroll position is set.
*/
virtual mozilla::MainThreadScrollGeneration CurrentScrollGeneration()
const = 0;
/**
* The APZ scroll generation associated with the last APZ scroll offset for
* which we processed a repaint request.
*/
virtual mozilla::APZScrollGeneration ScrollGenerationOnApz() const = 0;
/**
* LastScrollDestination returns the destination of the most recently
* requested smooth scroll animation.
*/
virtual nsPoint LastScrollDestination() = 0;
/**
* Returns the list of scroll position updates since the last call to
* NotifyApzTransaction().
*/
virtual nsTArray<mozilla::ScrollPositionUpdate> GetScrollUpdates() const = 0;
/**
* Returns true if the scroll frame has any scroll position updates since
* the last call to NotifyApzTransaction().
*/
virtual bool HasScrollUpdates() const = 0;
enum class InScrollingGesture : bool { No, Yes };
/**
* Clears the "origin of last scroll" property stored in this frame, if
* the generation counter passed in matches the current scroll generation
* counter, and clears the "origin of last smooth scroll" property if the
* generation counter matches. It also resets whether there's an ongoing apz
* animation.
*/
virtual void ResetScrollInfoIfNeeded(
const mozilla::MainThreadScrollGeneration& aGeneration,
const mozilla::APZScrollGeneration& aGenerationOnApz,
mozilla::APZScrollAnimationType aAPZScrollAnimationType,
InScrollingGesture aInScrollingGesture) = 0;
/**
* Determine whether it is desirable to be able to asynchronously scroll this
* scroll frame.
*/
virtual bool WantAsyncScroll() const = 0;
/**
* Returns the ScrollMetadata contributed by this frame, if there is one.
*/
virtual mozilla::Maybe<mozilla::layers::ScrollMetadata> ComputeScrollMetadata(
mozilla::layers::WebRenderLayerManager* aLayerManager,
const nsIFrame* aItemFrame,
const nsPoint& aOffsetToReferenceFrame) const = 0;
/**
* Mark the scrollbar frames for reflow.
*/
virtual void MarkScrollbarsDirtyForReflow() const = 0;
/**
* Invalidate the scrollbar after the marks have been changed.
*/
virtual void InvalidateScrollbars() const = 0;
virtual void UpdateScrollbarPosition() = 0;
virtual void SetTransformingByAPZ(bool aTransforming) = 0;
virtual bool IsTransformingByAPZ() const = 0;
/**
* Notify this scroll frame that it can be scrolled by APZ. In particular,
* this is called *after* the APZ code has created an APZC for this scroll
* frame and verified that it is not a scrollinfo layer. Therefore, setting an
* async transform on it is actually user visible.
*/
virtual void SetScrollableByAPZ(bool aScrollable) = 0;
/**
* Notify this scroll frame that it can be zoomed by APZ.
*/
virtual void SetZoomableByAPZ(bool aZoomable) = 0;
/**
* Mark this scroll frame as having out-of-flow content inside a CSS filter.
* Such content will move incorrectly during async-scrolling; to mitigate
* this, paint skipping is disabled for such scroll frames.
*/
virtual void SetHasOutOfFlowContentInsideFilter() = 0;
/**
* Determine if we should build a scrollable layer for this scroll frame and
* return the result. It will also record this result on the scroll frame.
* Pass the visible rect in aVisibleRect. On return it will be set to the
* displayport if there is one.
* Pass the dirty rect in aDirtyRect. On return it will be set to the
* dirty rect inside the displayport (ie the dirty rect that should be used).
* This function will set the display port base rect if aSetBase is true.
* aSetBase is only allowed to be false if there has been a call with it
* set to true before on the same paint.
*/
virtual bool DecideScrollableLayer(mozilla::nsDisplayListBuilder* aBuilder,
nsRect* aVisibleRect, nsRect* aDirtyRect,
bool aSetBase) = 0;
/**
* Notify the scrollframe that the current scroll offset and origin have been
* sent over in a layers transaction.
*
* This sets a flag on the scrollframe that indicates subsequent changes
* to the scroll position by "weaker" origins are permitted to overwrite the
* the scroll origin. Scroll origins that
* nsLayoutUtils::CanScrollOriginClobberApz returns false for are considered
* "weaker" than scroll origins for which that function returns true.
*
* This function must be called for a scrollframe after all calls to
* ComputeScrollMetadata in a layers transaction have been completed.
*
*/
virtual void NotifyApzTransaction() = 0;
/**
* Notification that this scroll frame is getting its frame visibility
* updated. aIgnoreDisplayPort indicates that the display port was ignored
* (because there was no suitable base rect)
*/
virtual void NotifyApproximateFrameVisibilityUpdate(
bool aIgnoreDisplayPort) = 0;
/**
* Returns true if this scroll frame had a display port at the last frame
* visibility update and fills in aDisplayPort with that displayport. Returns
* false otherwise, and doesn't touch aDisplayPort.
*/
virtual bool GetDisplayPortAtLastApproximateFrameVisibilityUpdate(
nsRect* aDisplayPort) = 0;
/**
* This is called when a descendant scrollframe's has its displayport expired.
* This function will check to see if this scrollframe may safely expire its
* own displayport and schedule a timer to do that if it is safe.
*/
virtual void TriggerDisplayPortExpiration() = 0;
/**
* Returns information required to determine where to snap to after a scroll.
*/
virtual ScrollSnapInfo GetScrollSnapInfo() = 0;
virtual void TryResnap() = 0;
/**
* Post a pending re-snap request if the given |aFrame| is one of the snap
* points on the last scroll operation.
*/
virtual void PostPendingResnapIfNeeded(const nsIFrame* aFrame) = 0;
virtual void PostPendingResnap() = 0;
/**
* Returns a pair of the scroll-snap-align property value both on X and Y axes
* for the given |aFrame| considering the scroll-snap-type of this scroll
* container. For example, if the scroll-snap-type is `none`, the pair of
* scroll-snap-align is also `none none`.
*/
virtual PhysicalScrollSnapAlign GetScrollSnapAlignFor(
const nsIFrame* aFrame) const = 0;
/**
* Given the drag event aEvent, determine whether the mouse is near the edge
* of the scrollable area, and scroll the view in the direction of that edge
* if so. If scrolling occurred, true is returned. When false is returned, the
* caller should look for an ancestor to scroll.
*/
virtual bool DragScroll(mozilla::WidgetEvent* aEvent) = 0;
virtual void AsyncScrollbarDragInitiated(
uint64_t aDragBlockId, mozilla::layers::ScrollDirection aDirection) = 0;
virtual void AsyncScrollbarDragRejected() = 0;
/**
* Returns whether this scroll frame is the root scroll frame of the document
* that it is in. Note that some documents don't have root scroll frames at
* all (ie XUL documents) even though they may contain other scroll frames.
*/
virtual bool IsRootScrollFrameOfDocument() const = 0;
/**
* Returns the paint sequence number if this scroll frame was the first
* scrollable frame for the paint.
*/
virtual mozilla::Maybe<uint32_t> IsFirstScrollableFrameSequenceNumber()
const = 0;
/**
* Set the paint sequence number for the paint in which this was the first
* scrollable frame that was encountered.
*/
virtual void SetIsFirstScrollableFrameSequenceNumber(
mozilla::Maybe<uint32_t> aValue) = 0;
/**
* Returns the scroll anchor associated with this scrollable frame. This is
* never null.
*/
virtual const ScrollAnchorContainer* Anchor() const = 0;
virtual ScrollAnchorContainer* Anchor() = 0;
virtual bool SmoothScrollVisual(
const nsPoint& aVisualViewportOffset,
mozilla::layers::FrameMetrics::ScrollOffsetUpdateType aUpdateType) = 0;
/**
* Returns true if this scroll frame should perform smooth scroll with the
* given |aBehavior|.
*/
virtual bool IsSmoothScroll(mozilla::dom::ScrollBehavior aBehavior =
mozilla::dom::ScrollBehavior::Auto) const = 0;
};
#endif