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242 lines
9.2 KiB
C
242 lines
9.2 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 "nsDebug.h"
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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 = 0x01,
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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 = 0x02,
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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 = 0x04,
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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 = 0x08,
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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 = 0x10,
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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 = 0x20,
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// The currently shown mouse cursor needs to be updated
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nsChangeHint_UpdateCursor = 0x40,
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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 = 0x80,
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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 = 0x100,
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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 = 0x200,
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/**
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* Change requires frame change (e.g., display:).
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* This subsumes all the above. Reconstructs all frame descendants,
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* including following placeholders to out-of-flows.
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*/
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nsChangeHint_ReconstructFrame = 0x400,
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/**
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* The frame's effect on its ancestors' overflow areas has changed,
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* either through a change in its transform or a change in its position.
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* Does not update any descendant frames.
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*/
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nsChangeHint_UpdateOverflow = 0x800,
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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 = 0x1000,
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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 = 0x2000,
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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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nsChangeHint_AddOrRemoveTransform = 0x4000,
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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 = 0x8000,
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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 = 0x10000
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// IMPORTANT NOTE: When adding new hints, consider whether you need to
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// add them to NS_HintsNotHandledForDescendantsIn() below.
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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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// Merge two hints, taking the union
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inline nsChangeHint NS_CombineHint(nsChangeHint aH1, nsChangeHint aH2) {
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return (nsChangeHint)(aH1 | aH2);
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}
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// Merge two hints, taking the union
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inline nsChangeHint NS_SubtractHint(nsChangeHint aH1, nsChangeHint aH2) {
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return (nsChangeHint)(aH1 & ~aH2);
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}
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// Merge the "src" hint into the "dst" hint
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// Returns true iff the destination changed
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inline bool NS_UpdateHint(nsChangeHint& aDest, nsChangeHint aSrc) {
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nsChangeHint r = (nsChangeHint)(aDest | aSrc);
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bool changed = (int)r != (int)aDest;
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aDest = r;
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return changed;
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}
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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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/**
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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_UpdateOpacityLayer | \
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nsChangeHint_UpdateOverflow | \
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nsChangeHint_ChildrenOnlyTransform | \
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nsChangeHint_RecomputePosition | \
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nsChangeHint_AddOrRemoveTransform | \
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nsChangeHint_BorderStyleNoneChange | \
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nsChangeHint_NeedReflow | \
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nsChangeHint_ClearAncestorIntrinsics)
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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_UpdateOpacityLayer |
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nsChangeHint_UpdateOverflow |
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nsChangeHint_ChildrenOnlyTransform |
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nsChangeHint_RecomputePosition |
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nsChangeHint_AddOrRemoveTransform |
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nsChangeHint_BorderStyleNoneChange));
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if (!NS_IsHintSubset(nsChangeHint_NeedDirtyReflow, aChangeHint) &&
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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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NS_UpdateHint(result, nsChangeHint_NeedReflow);
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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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NS_UpdateHint(result, nsChangeHint_ClearAncestorIntrinsics);
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}
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NS_ABORT_IF_FALSE(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_NONE \
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nsChangeHint(0)
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#define NS_STYLE_HINT_VISUAL \
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nsChangeHint(nsChangeHint_RepaintFrame | nsChangeHint_SyncFrameView)
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#define nsChangeHint_AllReflowHints \
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nsChangeHint(nsChangeHint_NeedReflow | \
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nsChangeHint_ClearAncestorIntrinsics | \
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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 NS_STYLE_HINT_FRAMECHANGE \
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nsChangeHint(NS_STYLE_HINT_REFLOW | nsChangeHint_ReconstructFrame)
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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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enum nsRestyleHint {
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eRestyle_Self = 0x1,
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eRestyle_Subtree = 0x2, /* self and descendants */
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eRestyle_LaterSiblings = 0x4 /* implies "and descendants" */
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};
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#endif /* nsChangeHint_h___ */
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