mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-12-04 02:57:38 +00:00
255 lines
9.5 KiB
C
255 lines
9.5 KiB
C
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
|
|
/* 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/. */
|
|
|
|
/* constants for what needs to be recomputed in response to style changes */
|
|
|
|
#ifndef nsChangeHint_h___
|
|
#define nsChangeHint_h___
|
|
|
|
#include "nsDebug.h"
|
|
|
|
// Defines for various style related constants
|
|
|
|
enum nsChangeHint {
|
|
// change was visual only (e.g., COLOR=)
|
|
// Invalidates all descendant frames (including following
|
|
// placeholders to out-of-flow frames).
|
|
nsChangeHint_RepaintFrame = 0x01,
|
|
|
|
// For reflow, we want flags to give us arbitrary FrameNeedsReflow behavior.
|
|
// just do a FrameNeedsReflow.
|
|
nsChangeHint_NeedReflow = 0x02,
|
|
|
|
// Invalidate intrinsic widths on the frame's ancestors. Must not be set
|
|
// without setting nsChangeHint_NeedReflow.
|
|
nsChangeHint_ClearAncestorIntrinsics = 0x04,
|
|
|
|
// Invalidate intrinsic widths on the frame's descendants. Must not be set
|
|
// without also setting nsChangeHint_ClearAncestorIntrinsics.
|
|
nsChangeHint_ClearDescendantIntrinsics = 0x08,
|
|
|
|
// Force unconditional reflow of all descendants. Must not be set without
|
|
// setting nsChangeHint_NeedReflow, but is independent of both the
|
|
// Clear*Intrinsics flags.
|
|
nsChangeHint_NeedDirtyReflow = 0x10,
|
|
|
|
// change requires view to be updated, if there is one (e.g., clip:).
|
|
// Updates all descendants (including following placeholders to out-of-flows).
|
|
nsChangeHint_SyncFrameView = 0x20,
|
|
|
|
// The currently shown mouse cursor needs to be updated
|
|
nsChangeHint_UpdateCursor = 0x40,
|
|
|
|
/**
|
|
* Used when the computed value (a URI) of one or more of an element's
|
|
* filter/mask/clip/etc CSS properties changes, causing the element's frame
|
|
* to start/stop referencing (or reference different) SVG resource elements.
|
|
* (_Not_ used to handle changes to referenced resource elements.) Using this
|
|
* hint results in nsSVGEffects::UpdateEffects being called on the element's
|
|
* frame.
|
|
*/
|
|
nsChangeHint_UpdateEffects = 0x80,
|
|
|
|
/**
|
|
* Visual change only, but the change can be handled entirely by
|
|
* updating the layer(s) for the frame.
|
|
* Updates all descendants (including following placeholders to out-of-flows).
|
|
*/
|
|
nsChangeHint_UpdateOpacityLayer = 0x100,
|
|
/**
|
|
* Updates all descendants. Any placeholder descendants' out-of-flows
|
|
* are also descendants of the transformed frame, so they're updated.
|
|
*/
|
|
nsChangeHint_UpdateTransformLayer = 0x200,
|
|
|
|
/**
|
|
* Change requires frame change (e.g., display:).
|
|
* This subsumes all the above. Reconstructs all frame descendants,
|
|
* including following placeholders to out-of-flows.
|
|
*/
|
|
nsChangeHint_ReconstructFrame = 0x400,
|
|
|
|
/**
|
|
* The frame's overflow area has changed. Does not update any descendant
|
|
* frames.
|
|
*/
|
|
nsChangeHint_UpdateOverflow = 0x800,
|
|
|
|
/**
|
|
* The overflow area of the frame and all of its descendants has changed. This
|
|
* can happen through a text-decoration change.
|
|
*/
|
|
nsChangeHint_UpdateSubtreeOverflow = 0x1000,
|
|
|
|
/**
|
|
* The frame's overflow area has changed, through a change in its transform.
|
|
* Does not update any descendant frames.
|
|
*/
|
|
nsChangeHint_UpdatePostTransformOverflow = 0x2000,
|
|
|
|
/**
|
|
* The children-only transform of an SVG frame changed, requiring the
|
|
* overflow rects of the frame's immediate children to be updated.
|
|
*/
|
|
nsChangeHint_ChildrenOnlyTransform = 0x4000,
|
|
|
|
/**
|
|
* The frame's offsets have changed, while its dimensions might have
|
|
* changed as well. This hint is used for positioned frames if their
|
|
* offset changes. If we decide that the dimensions are likely to
|
|
* change, this will trigger a reflow.
|
|
*
|
|
* Note that this should probably be used in combination with
|
|
* nsChangeHint_UpdateOverflow in order to get the overflow areas of
|
|
* the ancestors updated as well.
|
|
*/
|
|
nsChangeHint_RecomputePosition = 0x8000,
|
|
|
|
/**
|
|
* Behaves like ReconstructFrame, but only if the frame has descendants
|
|
* that are absolutely or fixed position. Use this hint when a style change
|
|
* has changed whether the frame is a container for fixed-pos or abs-pos
|
|
* elements, but reframing is otherwise not needed.
|
|
*/
|
|
nsChangeHint_AddOrRemoveTransform = 0x10000,
|
|
|
|
/**
|
|
* This change hint has *no* change handling behavior. However, it
|
|
* exists to be a non-inherited hint, because when the border-style
|
|
* changes, and it's inherited by a child, that might require a reflow
|
|
* due to the border-width change on the child.
|
|
*/
|
|
nsChangeHint_BorderStyleNoneChange = 0x20000,
|
|
|
|
/**
|
|
* SVG textPath needs to be recomputed because the path has changed.
|
|
* This means that the glyph positions of the text need to be recomputed.
|
|
*/
|
|
nsChangeHint_UpdateTextPath = 0x40000
|
|
|
|
// IMPORTANT NOTE: When adding new hints, consider whether you need to
|
|
// add them to NS_HintsNotHandledForDescendantsIn() below.
|
|
};
|
|
|
|
// Redefine these operators to return nothing. This will catch any use
|
|
// of these operators on hints. We should not be using these operators
|
|
// on nsChangeHints
|
|
inline void operator<(nsChangeHint s1, nsChangeHint s2) {}
|
|
inline void operator>(nsChangeHint s1, nsChangeHint s2) {}
|
|
inline void operator!=(nsChangeHint s1, nsChangeHint s2) {}
|
|
inline void operator==(nsChangeHint s1, nsChangeHint s2) {}
|
|
inline void operator<=(nsChangeHint s1, nsChangeHint s2) {}
|
|
inline void operator>=(nsChangeHint s1, nsChangeHint s2) {}
|
|
|
|
// Operators on nsChangeHints
|
|
|
|
// Merge two hints, taking the union
|
|
inline nsChangeHint NS_CombineHint(nsChangeHint aH1, nsChangeHint aH2) {
|
|
return (nsChangeHint)(aH1 | aH2);
|
|
}
|
|
|
|
// Merge two hints, taking the union
|
|
inline nsChangeHint NS_SubtractHint(nsChangeHint aH1, nsChangeHint aH2) {
|
|
return (nsChangeHint)(aH1 & ~aH2);
|
|
}
|
|
|
|
// Merge the "src" hint into the "dst" hint
|
|
// Returns true iff the destination changed
|
|
inline bool NS_UpdateHint(nsChangeHint& aDest, nsChangeHint aSrc) {
|
|
nsChangeHint r = (nsChangeHint)(aDest | aSrc);
|
|
bool changed = (int)r != (int)aDest;
|
|
aDest = r;
|
|
return changed;
|
|
}
|
|
|
|
// Returns true iff the second hint contains all the hints of the first hint
|
|
inline bool NS_IsHintSubset(nsChangeHint aSubset, nsChangeHint aSuperSet) {
|
|
return (aSubset & aSuperSet) == aSubset;
|
|
}
|
|
|
|
/**
|
|
* We have an optimization when processing change hints which prevents
|
|
* us from visiting the descendants of a node when a hint on that node
|
|
* is being processed. This optimization does not apply in some of the
|
|
* cases where applying a hint to an element does not necessarily result
|
|
* in the same hint being handled on the descendants.
|
|
*/
|
|
|
|
// The most hints that NS_HintsNotHandledForDescendantsIn could possibly return:
|
|
#define nsChangeHint_Hints_NotHandledForDescendants nsChangeHint( \
|
|
nsChangeHint_UpdateTransformLayer | \
|
|
nsChangeHint_UpdateEffects | \
|
|
nsChangeHint_UpdateOpacityLayer | \
|
|
nsChangeHint_UpdateOverflow | \
|
|
nsChangeHint_UpdatePostTransformOverflow | \
|
|
nsChangeHint_ChildrenOnlyTransform | \
|
|
nsChangeHint_RecomputePosition | \
|
|
nsChangeHint_AddOrRemoveTransform | \
|
|
nsChangeHint_BorderStyleNoneChange | \
|
|
nsChangeHint_NeedReflow | \
|
|
nsChangeHint_ClearAncestorIntrinsics)
|
|
|
|
inline nsChangeHint NS_HintsNotHandledForDescendantsIn(nsChangeHint aChangeHint) {
|
|
nsChangeHint result = nsChangeHint(aChangeHint & (
|
|
nsChangeHint_UpdateTransformLayer |
|
|
nsChangeHint_UpdateEffects |
|
|
nsChangeHint_UpdateOpacityLayer |
|
|
nsChangeHint_UpdateOverflow |
|
|
nsChangeHint_UpdatePostTransformOverflow |
|
|
nsChangeHint_ChildrenOnlyTransform |
|
|
nsChangeHint_RecomputePosition |
|
|
nsChangeHint_AddOrRemoveTransform |
|
|
nsChangeHint_BorderStyleNoneChange));
|
|
|
|
if (!NS_IsHintSubset(nsChangeHint_NeedDirtyReflow, aChangeHint) &&
|
|
NS_IsHintSubset(nsChangeHint_NeedReflow, aChangeHint)) {
|
|
// If NeedDirtyReflow is *not* set, then NeedReflow is a
|
|
// non-inherited hint.
|
|
NS_UpdateHint(result, nsChangeHint_NeedReflow);
|
|
}
|
|
|
|
if (!NS_IsHintSubset(nsChangeHint_ClearDescendantIntrinsics, aChangeHint) &&
|
|
NS_IsHintSubset(nsChangeHint_ClearAncestorIntrinsics, aChangeHint)) {
|
|
// If ClearDescendantIntrinsics is *not* set, then
|
|
// ClearAncestorIntrinsics is a non-inherited hint.
|
|
NS_UpdateHint(result, nsChangeHint_ClearAncestorIntrinsics);
|
|
}
|
|
|
|
NS_ABORT_IF_FALSE(NS_IsHintSubset(result,
|
|
nsChangeHint_Hints_NotHandledForDescendants),
|
|
"something is inconsistent");
|
|
|
|
return result;
|
|
}
|
|
|
|
// Redefine the old NS_STYLE_HINT constants in terms of the new hint structure
|
|
#define NS_STYLE_HINT_NONE \
|
|
nsChangeHint(0)
|
|
#define NS_STYLE_HINT_VISUAL \
|
|
nsChangeHint(nsChangeHint_RepaintFrame | nsChangeHint_SyncFrameView)
|
|
#define nsChangeHint_AllReflowHints \
|
|
nsChangeHint(nsChangeHint_NeedReflow | \
|
|
nsChangeHint_ClearAncestorIntrinsics | \
|
|
nsChangeHint_ClearDescendantIntrinsics | \
|
|
nsChangeHint_NeedDirtyReflow)
|
|
#define NS_STYLE_HINT_REFLOW \
|
|
nsChangeHint(NS_STYLE_HINT_VISUAL | nsChangeHint_AllReflowHints)
|
|
#define NS_STYLE_HINT_FRAMECHANGE \
|
|
nsChangeHint(NS_STYLE_HINT_REFLOW | nsChangeHint_ReconstructFrame)
|
|
|
|
/**
|
|
* |nsRestyleHint| is a bitfield for the result of
|
|
* |HasStateDependentStyle| and |HasAttributeDependentStyle|. When no
|
|
* restyling is necessary, use |nsRestyleHint(0)|.
|
|
*/
|
|
enum nsRestyleHint {
|
|
eRestyle_Self = 0x1,
|
|
eRestyle_Subtree = 0x2, /* self and descendants */
|
|
eRestyle_LaterSiblings = 0x4 /* implies "and descendants" */
|
|
};
|
|
|
|
|
|
#endif /* nsChangeHint_h___ */
|