594 lines
23 KiB
C++
594 lines
23 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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/* constants for what needs to be recomputed in response to style changes */
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#ifndef nsChangeHint_h___
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#define nsChangeHint_h___
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#include "mozilla/Types.h"
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#include "nsDebug.h"
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#include "nsTArray.h"
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struct nsCSSSelector;
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// Defines for various style related constants
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enum nsChangeHint {
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// change was visual only (e.g., COLOR=)
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// Invalidates all descendant frames (including following
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// placeholders to out-of-flow frames).
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nsChangeHint_RepaintFrame = 1 << 0,
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// For reflow, we want flags to give us arbitrary FrameNeedsReflow behavior.
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// just do a FrameNeedsReflow.
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nsChangeHint_NeedReflow = 1 << 1,
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// Invalidate intrinsic widths on the frame's ancestors. Must not be set
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// without setting nsChangeHint_NeedReflow.
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nsChangeHint_ClearAncestorIntrinsics = 1 << 2,
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// Invalidate intrinsic widths on the frame's descendants. Must not be set
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// without also setting nsChangeHint_ClearAncestorIntrinsics.
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nsChangeHint_ClearDescendantIntrinsics = 1 << 3,
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// Force unconditional reflow of all descendants. Must not be set without
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// setting nsChangeHint_NeedReflow, but is independent of both the
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// Clear*Intrinsics flags.
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nsChangeHint_NeedDirtyReflow = 1 << 4,
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// change requires view to be updated, if there is one (e.g., clip:).
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// Updates all descendants (including following placeholders to out-of-flows).
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nsChangeHint_SyncFrameView = 1 << 5,
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// The currently shown mouse cursor needs to be updated
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nsChangeHint_UpdateCursor = 1 << 6,
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/**
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* Used when the computed value (a URI) of one or more of an element's
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* filter/mask/clip/etc CSS properties changes, causing the element's frame
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* to start/stop referencing (or reference different) SVG resource elements.
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* (_Not_ used to handle changes to referenced resource elements.) Using this
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* hint results in nsSVGEffects::UpdateEffects being called on the element's
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* frame.
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*/
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nsChangeHint_UpdateEffects = 1 << 7,
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/**
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* Visual change only, but the change can be handled entirely by
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* updating the layer(s) for the frame.
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* Updates all descendants (including following placeholders to out-of-flows).
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*/
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nsChangeHint_UpdateOpacityLayer = 1 << 8,
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/**
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* Updates all descendants. Any placeholder descendants' out-of-flows
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* are also descendants of the transformed frame, so they're updated.
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*/
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nsChangeHint_UpdateTransformLayer = 1 << 9,
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/**
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* Change requires frame change (e.g., display:).
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* Reconstructs all frame descendants, including following placeholders
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* to out-of-flows.
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*
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* Note that this subsumes all the other change hints. (see
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* RestyleManager::ProcessRestyledFrames for details).
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*/
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nsChangeHint_ReconstructFrame = 1 << 10,
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/**
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* The frame's overflow area has changed. Does not update any descendant
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* frames.
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*/
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nsChangeHint_UpdateOverflow = 1 << 11,
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/**
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* The overflow area of the frame and all of its descendants has changed. This
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* can happen through a text-decoration change.
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*/
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nsChangeHint_UpdateSubtreeOverflow = 1 << 12,
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/**
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* The frame's overflow area has changed, through a change in its transform.
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* In other words, the frame's pre-transform overflow is unchanged, but
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* its post-transform overflow has changed, and thus its effect on its
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* parent's overflow has changed. If the pre-transform overflow has
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* changed, see nsChangeHint_UpdateOverflow.
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* Does not update any descendant frames.
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*/
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nsChangeHint_UpdatePostTransformOverflow = 1 << 13,
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/**
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* This frame's effect on its parent's overflow area has changed.
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* (But neither its pre-transform nor post-transform overflow have
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* changed; if those are the case, see
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* nsChangeHint_UpdatePostTransformOverflow.)
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*/
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nsChangeHint_UpdateParentOverflow = 1 << 14,
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/**
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* The children-only transform of an SVG frame changed, requiring the
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* overflow rects of the frame's immediate children to be updated.
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*/
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nsChangeHint_ChildrenOnlyTransform = 1 << 15,
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/**
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* The frame's offsets have changed, while its dimensions might have
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* changed as well. This hint is used for positioned frames if their
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* offset changes. If we decide that the dimensions are likely to
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* change, this will trigger a reflow.
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*
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* Note that this should probably be used in combination with
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* nsChangeHint_UpdateOverflow in order to get the overflow areas of
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* the ancestors updated as well.
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*/
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nsChangeHint_RecomputePosition = 1 << 16,
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/**
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* Behaves like ReconstructFrame, but only if the frame has descendants
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* that are absolutely or fixed position. Use this hint when a style change
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* has changed whether the frame is a container for fixed-pos or abs-pos
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* elements, but reframing is otherwise not needed.
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*
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* Note that nsStyleContext::CalcStyleDifference adjusts results
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* returned by style struct CalcDifference methods to return this hint
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* only if there was a change to whether the element's overall style
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* indicates that it establishes a containing block.
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*/
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nsChangeHint_UpdateContainingBlock = 1 << 17,
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/**
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* This change hint has *no* change handling behavior. However, it
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* exists to be a non-inherited hint, because when the border-style
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* changes, and it's inherited by a child, that might require a reflow
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* due to the border-width change on the child.
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*/
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nsChangeHint_BorderStyleNoneChange = 1 << 18,
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/**
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* SVG textPath needs to be recomputed because the path has changed.
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* This means that the glyph positions of the text need to be recomputed.
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*/
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nsChangeHint_UpdateTextPath = 1 << 19,
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/**
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* This will schedule an invalidating paint. This is useful if something
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* has changed which will be invalidated by DLBI.
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*/
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nsChangeHint_SchedulePaint = 1 << 20,
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/**
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* A hint reflecting that style data changed with no change handling
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* behavior. We need to return this, rather than nsChangeHint(0),
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* so that certain optimizations that manipulate the style context tree are
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* correct.
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*
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* nsChangeHint_NeutralChange must be returned by CalcDifference on a given
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* style struct if the data in the style structs are meaningfully different
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* and if no other change hints are returned. If any other change hints are
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* set, then nsChangeHint_NeutralChange need not also be included, but it is
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* safe to do so. (An example of style structs having non-meaningfully
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* different data would be cached information that would be re-calculated
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* to the same values, such as nsStyleBorder::mSubImages.)
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*/
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nsChangeHint_NeutralChange = 1 << 21,
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/**
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* This will cause rendering observers to be invalidated.
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*/
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nsChangeHint_InvalidateRenderingObservers = 1 << 22,
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/**
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* Indicates that the reflow changes the size or position of the
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* element, and thus the reflow must start from at least the frame's
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* parent.
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*/
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nsChangeHint_ReflowChangesSizeOrPosition = 1 << 23,
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/**
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* Indicates that the style changes the computed BSize --- e.g. 'height'.
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*/
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nsChangeHint_UpdateComputedBSize = 1 << 24,
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/**
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* Indicates that the 'opacity' property changed between 1 and non-1.
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*
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* Used as extra data for handling UpdateOpacityLayer hints.
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*
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* Note that we do not send this hint if the non-1 value was 0.99 or
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* greater, since in that case we send a RepaintFrame hint instead.
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*/
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nsChangeHint_UpdateUsesOpacity = 1 << 25,
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/**
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* Indicates that the 'background-position' property changed.
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* Regular frames can invalidate these changes using DLBI, but
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* for some frame types we need to repaint the whole frame because
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* the frame does not build individual background image display items
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* for each background layer.
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*/
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nsChangeHint_UpdateBackgroundPosition = 1 << 26,
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/**
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* Indicates that a frame has changed to or from having the CSS
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* transform property set.
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*/
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nsChangeHint_AddOrRemoveTransform = 1 << 27,
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/**
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* Indicates that the overflow-x and/or overflow-y property changed.
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*
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* In most cases, this is equivalent to nsChangeHint_ReconstructFrame. But
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* in some special cases where the change is really targeting the viewport's
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* scrollframe, this is instead equivalent to nsChangeHint_AllReflowHints
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* (because the viewport always has an associated scrollframe).
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*/
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nsChangeHint_ScrollbarChange = 1 << 28,
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// IMPORTANT NOTE: When adding new hints, consider whether you need
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// to add them to NS_HintsNotHandledForDescendantsIn() below. Please
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// also add them to RestyleManager::ChangeHintToString and modify
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// nsChangeHint_AllHints below accordingly.
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/**
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* Dummy hint value for all hints. It exists for compile time check.
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*/
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nsChangeHint_AllHints = (1 << 29) - 1,
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};
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// Redefine these operators to return nothing. This will catch any use
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// of these operators on hints. We should not be using these operators
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// on nsChangeHints
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inline void operator<(nsChangeHint s1, nsChangeHint s2) {}
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inline void operator>(nsChangeHint s1, nsChangeHint s2) {}
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inline void operator!=(nsChangeHint s1, nsChangeHint s2) {}
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inline void operator==(nsChangeHint s1, nsChangeHint s2) {}
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inline void operator<=(nsChangeHint s1, nsChangeHint s2) {}
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inline void operator>=(nsChangeHint s1, nsChangeHint s2) {}
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// Operators on nsChangeHints
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// Returns true iff the second hint contains all the hints of the first hint
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inline bool NS_IsHintSubset(nsChangeHint aSubset, nsChangeHint aSuperSet) {
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return (aSubset & aSuperSet) == aSubset;
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}
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// The functions below need an integral type to cast to to avoid
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// infinite recursion.
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typedef decltype(nsChangeHint(0) + nsChangeHint(0)) nsChangeHint_size_t;
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inline nsChangeHint constexpr
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operator|(nsChangeHint aLeft, nsChangeHint aRight)
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{
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return nsChangeHint(nsChangeHint_size_t(aLeft) | nsChangeHint_size_t(aRight));
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}
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inline nsChangeHint constexpr
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operator&(nsChangeHint aLeft, nsChangeHint aRight)
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{
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return nsChangeHint(nsChangeHint_size_t(aLeft) & nsChangeHint_size_t(aRight));
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}
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inline nsChangeHint& operator|=(nsChangeHint& aLeft, nsChangeHint aRight)
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{
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return aLeft = aLeft | aRight;
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}
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inline nsChangeHint& operator&=(nsChangeHint& aLeft, nsChangeHint aRight)
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{
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return aLeft = aLeft & aRight;
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}
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inline nsChangeHint constexpr
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operator~(nsChangeHint aArg)
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{
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return nsChangeHint(~nsChangeHint_size_t(aArg));
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}
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inline nsChangeHint constexpr
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operator^(nsChangeHint aLeft, nsChangeHint aRight)
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{
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return nsChangeHint(nsChangeHint_size_t(aLeft) ^ nsChangeHint_size_t(aRight));
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}
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inline nsChangeHint operator^=(nsChangeHint& aLeft, nsChangeHint aRight)
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{
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return aLeft = aLeft ^ aRight;
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}
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/**
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* We have an optimization when processing change hints which prevents
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* us from visiting the descendants of a node when a hint on that node
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* is being processed. This optimization does not apply in some of the
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* cases where applying a hint to an element does not necessarily result
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* in the same hint being handled on the descendants.
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*/
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// The most hints that NS_HintsNotHandledForDescendantsIn could possibly return:
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#define nsChangeHint_Hints_NotHandledForDescendants nsChangeHint( \
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nsChangeHint_UpdateTransformLayer | \
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nsChangeHint_UpdateEffects | \
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nsChangeHint_InvalidateRenderingObservers | \
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nsChangeHint_UpdateOpacityLayer | \
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nsChangeHint_UpdateOverflow | \
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nsChangeHint_UpdatePostTransformOverflow | \
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nsChangeHint_UpdateParentOverflow | \
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nsChangeHint_ChildrenOnlyTransform | \
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nsChangeHint_ScrollbarChange | \
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nsChangeHint_RecomputePosition | \
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nsChangeHint_UpdateContainingBlock | \
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nsChangeHint_AddOrRemoveTransform | \
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nsChangeHint_BorderStyleNoneChange | \
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nsChangeHint_NeedReflow | \
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nsChangeHint_ReflowChangesSizeOrPosition | \
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nsChangeHint_ClearAncestorIntrinsics | \
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nsChangeHint_UpdateComputedBSize | \
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nsChangeHint_UpdateUsesOpacity | \
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nsChangeHint_UpdateBackgroundPosition)
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inline nsChangeHint NS_HintsNotHandledForDescendantsIn(nsChangeHint aChangeHint) {
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nsChangeHint result = nsChangeHint(aChangeHint & (
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nsChangeHint_UpdateTransformLayer |
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nsChangeHint_UpdateEffects |
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nsChangeHint_InvalidateRenderingObservers |
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nsChangeHint_UpdateOpacityLayer |
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nsChangeHint_UpdateOverflow |
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nsChangeHint_UpdatePostTransformOverflow |
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nsChangeHint_UpdateParentOverflow |
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nsChangeHint_ChildrenOnlyTransform |
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nsChangeHint_RecomputePosition |
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nsChangeHint_UpdateContainingBlock |
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nsChangeHint_AddOrRemoveTransform |
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nsChangeHint_BorderStyleNoneChange |
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nsChangeHint_UpdateComputedBSize |
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nsChangeHint_UpdateUsesOpacity | \
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nsChangeHint_UpdateBackgroundPosition));
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if (!NS_IsHintSubset(nsChangeHint_NeedDirtyReflow, aChangeHint)) {
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if (NS_IsHintSubset(nsChangeHint_NeedReflow, aChangeHint)) {
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// If NeedDirtyReflow is *not* set, then NeedReflow is a
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// non-inherited hint.
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result |= nsChangeHint_NeedReflow;
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}
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if (NS_IsHintSubset(nsChangeHint_ReflowChangesSizeOrPosition,
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aChangeHint)) {
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// If NeedDirtyReflow is *not* set, then ReflowChangesSizeOrPosition is a
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// non-inherited hint.
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result |= nsChangeHint_ReflowChangesSizeOrPosition;
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}
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}
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if (!NS_IsHintSubset(nsChangeHint_ClearDescendantIntrinsics, aChangeHint) &&
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NS_IsHintSubset(nsChangeHint_ClearAncestorIntrinsics, aChangeHint)) {
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// If ClearDescendantIntrinsics is *not* set, then
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// ClearAncestorIntrinsics is a non-inherited hint.
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result |= nsChangeHint_ClearAncestorIntrinsics;
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}
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MOZ_ASSERT(NS_IsHintSubset(result,
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nsChangeHint_Hints_NotHandledForDescendants),
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"something is inconsistent");
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return result;
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}
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// Redefine the old NS_STYLE_HINT constants in terms of the new hint structure
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#define NS_STYLE_HINT_VISUAL \
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nsChangeHint(nsChangeHint_RepaintFrame | nsChangeHint_SyncFrameView | \
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nsChangeHint_SchedulePaint)
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#define nsChangeHint_AllReflowHints \
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nsChangeHint(nsChangeHint_NeedReflow | \
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nsChangeHint_ReflowChangesSizeOrPosition|\
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nsChangeHint_ClearAncestorIntrinsics | \
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nsChangeHint_ClearDescendantIntrinsics | \
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nsChangeHint_NeedDirtyReflow)
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// Below are the change hints that we send for ISize & BSize changes.
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// Each is similar to nsChangeHint_AllReflowHints with a few changes.
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// * For an ISize change, we send nsChangeHint_AllReflowHints, with two bits
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// excluded: nsChangeHint_ClearDescendantIntrinsics (because an ancestor's
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// inline-size change can't affect descendant intrinsic sizes), and
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// nsChangeHint_NeedDirtyReflow (because ISize changes don't need to *force*
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// all descendants to reflow).
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#define nsChangeHint_ReflowHintsForISizeChange \
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nsChangeHint(nsChangeHint_AllReflowHints & \
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~(nsChangeHint_ClearDescendantIntrinsics | \
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nsChangeHint_NeedDirtyReflow))
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// * For a BSize change, we send almost the same hints as for ISize changes,
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// with one extra: nsChangeHint_UpdateComputedBSize. We need this hint because
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// BSize changes CAN affect descendant intrinsic sizes, due to replaced
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// elements with percentage BSizes in descendants which also have percentage
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// BSizes. nsChangeHint_UpdateComputedBSize clears intrinsic sizes for frames
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// that have such replaced elements. (We could instead send
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// nsChangeHint_ClearDescendantIntrinsics, but that's broader than we need.)
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//
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// NOTE: You might think that BSize changes could exclude
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// nsChangeHint_ClearAncestorIntrinsics (which is inline-axis specific), but we
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// do need to send it, to clear cached results from CSS Flex measuring reflows.
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#define nsChangeHint_ReflowHintsForBSizeChange \
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nsChangeHint((nsChangeHint_AllReflowHints | \
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nsChangeHint_UpdateComputedBSize) & \
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~(nsChangeHint_ClearDescendantIntrinsics | \
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nsChangeHint_NeedDirtyReflow))
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// * For changes to the float area of an already-floated element, we need all
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// reflow hints, but not the ones that apply to descendants.
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// Our descendants aren't impacted when our float area only changes
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// placement but not size/shape. (e.g. if we change which side we float to).
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// But our ancestors/siblings are potentially impacted, so we need to send
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// the non-descendant reflow hints.
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#define nsChangeHint_ReflowHintsForFloatAreaChange \
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nsChangeHint(nsChangeHint_AllReflowHints & \
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~(nsChangeHint_ClearDescendantIntrinsics | \
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nsChangeHint_NeedDirtyReflow))
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#define NS_STYLE_HINT_REFLOW \
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nsChangeHint(NS_STYLE_HINT_VISUAL | nsChangeHint_AllReflowHints)
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#define nsChangeHint_Hints_CanIgnoreIfNotVisible \
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nsChangeHint(NS_STYLE_HINT_VISUAL | \
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nsChangeHint_NeutralChange | \
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nsChangeHint_UpdateOpacityLayer | \
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nsChangeHint_UpdateTransformLayer | \
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nsChangeHint_UpdateUsesOpacity)
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/**
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* |nsRestyleHint| is a bitfield for the result of
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* |HasStateDependentStyle| and |HasAttributeDependentStyle|. When no
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* restyling is necessary, use |nsRestyleHint(0)|.
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*
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* Without eRestyle_Force or eRestyle_ForceDescendants, the restyling process
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* can stop processing at a frame when it detects no style changes and it is
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* known that the styles of the subtree beneath it will not change, leaving
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* the old style context on the frame. eRestyle_Force can be used to skip this
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* optimization on a frame, and to force its new style context to be used.
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*
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* Similarly, eRestyle_ForceDescendants will cause the frame and all of its
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* descendants to be traversed and for the new style contexts that are created
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* to be set on the frames.
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*
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* NOTE: When adding new restyle hints, please also add them to
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* RestyleManager::RestyleHintToString.
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*/
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enum nsRestyleHint {
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// Rerun selector matching on the element. If a new style context
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// results, update the style contexts of descendants. (Irrelevant if
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// eRestyle_Subtree is also set, since that implies a superset of the
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// work.)
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eRestyle_Self = 1 << 0,
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// Rerun selector matching on descendants of the element that match
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// a given selector.
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eRestyle_SomeDescendants = 1 << 1,
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// Rerun selector matching on the element and all of its descendants.
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// (Implies eRestyle_ForceDescendants, which ensures that we continue
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// the restyling process for all descendants, but doesn't cause
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// selector matching.)
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eRestyle_Subtree = 1 << 2,
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|
|
|
// Rerun selector matching on all later siblings of the element and
|
|
// all of their descendants.
|
|
eRestyle_LaterSiblings = 1 << 3,
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|
|
|
// Replace the style data coming from CSS transitions without updating
|
|
// any other style data. If a new style context results, update style
|
|
// contexts on the descendants. (Irrelevant if eRestyle_Self or
|
|
// eRestyle_Subtree is also set, since those imply a superset of the
|
|
// work.)
|
|
eRestyle_CSSTransitions = 1 << 4,
|
|
|
|
// Replace the style data coming from CSS animations without updating
|
|
// any other style data. If a new style context results, update style
|
|
// contexts on the descendants. (Irrelevant if eRestyle_Self or
|
|
// eRestyle_Subtree is also set, since those imply a superset of the
|
|
// work.)
|
|
eRestyle_CSSAnimations = 1 << 5,
|
|
|
|
// Replace the style data coming from SVG animations (SMIL Animations)
|
|
// without updating any other style data. If a new style context
|
|
// results, update style contexts on the descendants. (Irrelevant if
|
|
// eRestyle_Self or eRestyle_Subtree is also set, since those imply a
|
|
// superset of the work.)
|
|
eRestyle_SVGAttrAnimations = 1 << 6,
|
|
|
|
// Replace the style data coming from inline style without updating
|
|
// any other style data. If a new style context results, update style
|
|
// contexts on the descendants. (Irrelevant if eRestyle_Self or
|
|
// eRestyle_Subtree is also set, since those imply a superset of the
|
|
// work.) Supported only for element style contexts and not for
|
|
// pseudo-elements or anonymous boxes, on which it converts to
|
|
// eRestyle_Self.
|
|
// If the change is for the advance of a declarative animation, use
|
|
// the value below instead.
|
|
eRestyle_StyleAttribute = 1 << 7,
|
|
|
|
// Same as eRestyle_StyleAttribute, but for when the change results
|
|
// from the advance of a declarative animation.
|
|
eRestyle_StyleAttribute_Animations = 1 << 8,
|
|
|
|
// Continue the restyling process to the current frame's children even
|
|
// if this frame's restyling resulted in no style changes.
|
|
eRestyle_Force = 1 << 9,
|
|
|
|
// Continue the restyling process to all of the current frame's
|
|
// descendants, even if any frame's restyling resulted in no style
|
|
// changes. (Implies eRestyle_Force.) Note that this is weaker than
|
|
// eRestyle_Subtree, which makes us rerun selector matching on all
|
|
// descendants rather than just continuing the restyling process.
|
|
eRestyle_ForceDescendants = 1 << 10,
|
|
|
|
// Useful unions:
|
|
eRestyle_AllHintsWithAnimations = eRestyle_CSSTransitions |
|
|
eRestyle_CSSAnimations |
|
|
eRestyle_SVGAttrAnimations |
|
|
eRestyle_StyleAttribute_Animations,
|
|
};
|
|
|
|
// The functions below need an integral type to cast to to avoid
|
|
// infinite recursion.
|
|
typedef decltype(nsRestyleHint(0) + nsRestyleHint(0)) nsRestyleHint_size_t;
|
|
|
|
inline constexpr nsRestyleHint operator|(nsRestyleHint aLeft,
|
|
nsRestyleHint aRight)
|
|
{
|
|
return nsRestyleHint(nsRestyleHint_size_t(aLeft) |
|
|
nsRestyleHint_size_t(aRight));
|
|
}
|
|
|
|
inline constexpr nsRestyleHint operator&(nsRestyleHint aLeft,
|
|
nsRestyleHint aRight)
|
|
{
|
|
return nsRestyleHint(nsRestyleHint_size_t(aLeft) &
|
|
nsRestyleHint_size_t(aRight));
|
|
}
|
|
|
|
inline nsRestyleHint& operator|=(nsRestyleHint& aLeft, nsRestyleHint aRight)
|
|
{
|
|
return aLeft = aLeft | aRight;
|
|
}
|
|
|
|
inline nsRestyleHint& operator&=(nsRestyleHint& aLeft, nsRestyleHint aRight)
|
|
{
|
|
return aLeft = aLeft & aRight;
|
|
}
|
|
|
|
inline constexpr nsRestyleHint operator~(nsRestyleHint aArg)
|
|
{
|
|
return nsRestyleHint(~nsRestyleHint_size_t(aArg));
|
|
}
|
|
|
|
inline constexpr nsRestyleHint operator^(nsRestyleHint aLeft,
|
|
nsRestyleHint aRight)
|
|
{
|
|
return nsRestyleHint(nsRestyleHint_size_t(aLeft) ^
|
|
nsRestyleHint_size_t(aRight));
|
|
}
|
|
|
|
inline nsRestyleHint operator^=(nsRestyleHint& aLeft, nsRestyleHint aRight)
|
|
{
|
|
return aLeft = aLeft ^ aRight;
|
|
}
|
|
|
|
namespace mozilla {
|
|
|
|
/**
|
|
* Additional data used in conjunction with an nsRestyleHint to control the
|
|
* restyle process.
|
|
*/
|
|
struct RestyleHintData
|
|
{
|
|
// When eRestyle_SomeDescendants is used, this array contains the selectors
|
|
// that identify which descendants will be restyled.
|
|
nsTArray<nsCSSSelector*> mSelectorsForDescendants;
|
|
};
|
|
|
|
} // namespace mozilla
|
|
|
|
#endif /* nsChangeHint_h___ */
|