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gecko-dev/layout/generic/nsFrame.h

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/* -*- 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/. */
/* base class of all rendering objects */
#ifndef nsFrame_h___
#define nsFrame_h___
#include "mozilla/Attributes.h"
#include "mozilla/EventForwards.h"
#include "mozilla/Likely.h"
#include "nsBox.h"
#include "mozilla/Logging.h"
#include "nsIPresShell.h"
#include "mozilla/ReflowInput.h"
#include "nsHTMLParts.h"
#include "nsISelectionDisplay.h"
/**
* nsFrame logging constants. We redefine the nspr
* PRLogModuleInfo.level field to be a bitfield. Each bit controls a
* specific type of logging. Each logging operation has associated
* inline methods defined below.
*
* Due to the redefinition of the level field we cannot use MOZ_LOG directly
* as that will cause assertions due to invalid log levels.
*/
#define NS_FRAME_TRACE_CALLS 0x1
#define NS_FRAME_TRACE_PUSH_PULL 0x2
#define NS_FRAME_TRACE_CHILD_REFLOW 0x4
#define NS_FRAME_TRACE_NEW_FRAMES 0x8
#define NS_FRAME_LOG_TEST(_lm,_bit) (int(((mozilla::LogModule*)_lm)->Level()) & (_bit))
#ifdef DEBUG
#define NS_FRAME_LOG(_bit,_args) \
PR_BEGIN_MACRO \
if (NS_FRAME_LOG_TEST(nsFrame::sFrameLogModule,_bit)) { \
printf_stderr _args; \
} \
PR_END_MACRO
#else
#define NS_FRAME_LOG(_bit,_args)
#endif
// XXX Need to rework this so that logging is free when it's off
#ifdef DEBUG
#define NS_FRAME_TRACE_IN(_method) Trace(_method, true)
#define NS_FRAME_TRACE_OUT(_method) Trace(_method, false)
// XXX remove me
#define NS_FRAME_TRACE_MSG(_bit,_args) \
PR_BEGIN_MACRO \
if (NS_FRAME_LOG_TEST(nsFrame::sFrameLogModule,_bit)) { \
TraceMsg _args; \
} \
PR_END_MACRO
#define NS_FRAME_TRACE(_bit,_args) \
PR_BEGIN_MACRO \
if (NS_FRAME_LOG_TEST(nsFrame::sFrameLogModule,_bit)) { \
TraceMsg _args; \
} \
PR_END_MACRO
#define NS_FRAME_TRACE_REFLOW_IN(_method) Trace(_method, true)
#define NS_FRAME_TRACE_REFLOW_OUT(_method, _status) \
Trace(_method, false, _status)
#else
#define NS_FRAME_TRACE(_bits,_args)
#define NS_FRAME_TRACE_IN(_method)
#define NS_FRAME_TRACE_OUT(_method)
#define NS_FRAME_TRACE_MSG(_bits,_args)
#define NS_FRAME_TRACE_REFLOW_IN(_method)
#define NS_FRAME_TRACE_REFLOW_OUT(_method, _status)
#endif
// Frame allocation boilerplate macros. Every subclass of nsFrame must
// either use NS_{DECL,IMPL}_FRAMEARENA_HELPERS pair for allocating
// memory correctly, or use NS_DECL_ABSTRACT_FRAME to declare a frame
// class abstract and stop it from being instantiated. If a frame class
// without its own operator new and GetFrameId gets instantiated, the
// per-frame recycler lists in nsPresArena will not work correctly,
// with potentially catastrophic consequences (not enough memory is
// allocated for a frame object).
#define NS_DECL_FRAMEARENA_HELPERS(class) \
NS_DECL_QUERYFRAME_TARGET(class) \
static constexpr nsIFrame::ClassID kClassID = nsIFrame::ClassID::class##_id; \
void* operator new(size_t, nsIPresShell*) MOZ_MUST_OVERRIDE; \
nsQueryFrame::FrameIID GetFrameId() override MOZ_MUST_OVERRIDE { \
return nsQueryFrame::class##_id; \
}
#define NS_IMPL_FRAMEARENA_HELPERS(class) \
void* class::operator new(size_t sz, nsIPresShell* aShell) \
{ return aShell->AllocateFrame(nsQueryFrame::class##_id, sz); } \
#define NS_DECL_ABSTRACT_FRAME(class) \
void* operator new(size_t, nsIPresShell*) MOZ_MUST_OVERRIDE = delete; \
virtual nsQueryFrame::FrameIID GetFrameId() override MOZ_MUST_OVERRIDE = 0;
//----------------------------------------------------------------------
struct nsBoxLayoutMetrics;
struct nsRect;
/**
* Implementation of a simple frame that's not splittable and has no
* child frames.
*
* Sets the NS_FRAME_SYNCHRONIZE_FRAME_AND_VIEW bit, so the default
* behavior is to keep the frame and view position and size in sync.
*/
class nsFrame : public nsBox
{
public:
/**
* Create a new "empty" frame that maps a given piece of content into a
* 0,0 area.
*/
friend nsIFrame* NS_NewEmptyFrame(nsIPresShell* aShell,
nsStyleContext* aContext);
private:
// Left undefined; nsFrame objects are never allocated from the heap.
void* operator new(size_t sz) CPP_THROW_NEW;
protected:
// Overridden to prevent the global delete from being called, since
// the memory came out of an arena instead of the heap.
//
// Ideally this would be private and undefined, like the normal
// operator new. Unfortunately, the C++ standard requires an
// overridden operator delete to be accessible to any subclass that
// defines a virtual destructor, so we can only make it protected;
// worse, some C++ compilers will synthesize calls to this function
// from the "deleting destructors" that they emit in case of
// delete-expressions, so it can't even be undefined.
void operator delete(void* aPtr, size_t sz);
public:
// nsQueryFrame
NS_DECL_QUERYFRAME
NS_DECL_QUERYFRAME_TARGET(nsFrame)
virtual nsQueryFrame::FrameIID GetFrameId() MOZ_MUST_OVERRIDE {
return kFrameIID;
}
void* operator new(size_t, nsIPresShell*) MOZ_MUST_OVERRIDE;
// nsIFrame
void Init(nsIContent* aContent,
nsContainerFrame* aParent,
nsIFrame* aPrevInFlow) override;
void DestroyFrom(nsIFrame* aDestructRoot, PostDestroyData& aPostDestroyData) override;
nsStyleContext* GetAdditionalStyleContext(int32_t aIndex) const override;
void SetAdditionalStyleContext(int32_t aIndex,
nsStyleContext* aStyleContext) override;
nscoord GetLogicalBaseline(mozilla::WritingMode aWritingMode) const override;
const nsFrameList& GetChildList(ChildListID aListID) const override;
void GetChildLists(nsTArray<ChildList>* aLists) const override;
nsresult HandleEvent(nsPresContext* aPresContext,
mozilla::WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus) override;
nsresult GetContentForEvent(mozilla::WidgetEvent* aEvent,
nsIContent** aContent) override;
nsresult GetCursor(const nsPoint& aPoint,
nsIFrame::Cursor& aCursor) override;
nsresult GetPointFromOffset(int32_t inOffset,
nsPoint* outPoint) override;
nsresult GetCharacterRectsInRange(int32_t aInOffset,
int32_t aLength,
nsTArray<nsRect>& aOutRect) override;
nsresult GetChildFrameContainingOffset(int32_t inContentOffset,
bool inHint,
int32_t* outFrameContentOffset,
nsIFrame** outChildFrame) override;
static nsresult GetNextPrevLineFromeBlockFrame(nsPresContext* aPresContext,
nsPeekOffsetStruct *aPos,
nsIFrame *aBlockFrame,
int32_t aLineStart,
int8_t aOutSideLimit);
nsresult CharacterDataChanged(CharacterDataChangeInfo* aInfo) override;
nsresult AttributeChanged(int32_t aNameSpaceID,
nsAtom* aAttribute,
int32_t aModType) override;
nsSplittableType GetSplittableType() const override;
nsIFrame* GetPrevContinuation() const override;
void SetPrevContinuation(nsIFrame*) override;
nsIFrame* GetNextContinuation() const override;
void SetNextContinuation(nsIFrame*) override;
nsIFrame* GetPrevInFlowVirtual() const override;
void SetPrevInFlow(nsIFrame*) override;
nsIFrame* GetNextInFlowVirtual() const override;
void SetNextInFlow(nsIFrame*) override;
nsresult GetSelectionController(nsPresContext *aPresContext,
nsISelectionController **aSelCon) override;
FrameSearchResult PeekOffsetNoAmount(bool aForward,
int32_t* aOffset) override;
FrameSearchResult
PeekOffsetCharacter(bool aForward, int32_t* aOffset,
PeekOffsetCharacterOptions aOptions =
PeekOffsetCharacterOptions()) override;
FrameSearchResult PeekOffsetWord(bool aForward, bool aWordSelectEatSpace,
bool aIsKeyboardSelect,
int32_t* aOffset,
PeekWordState *aState) override;
/**
* Check whether we should break at a boundary between punctuation and
* non-punctuation. Only call it at a punctuation boundary
* (i.e. exactly one of the previous and next characters are punctuation).
* @param aForward true if we're moving forward in content order
* @param aPunctAfter true if the next character is punctuation
* @param aWhitespaceAfter true if the next character is whitespace
*/
bool BreakWordBetweenPunctuation(const PeekWordState* aState,
bool aForward,
bool aPunctAfter, bool aWhitespaceAfter,
bool aIsKeyboardSelect);
nsresult CheckVisibility(nsPresContext* aContext,
int32_t aStartIndex, int32_t aEndIndex,
bool aRecurse, bool *aFinished,
bool *_retval) override;
nsresult GetOffsets(int32_t &aStart, int32_t &aEnd) const override;
void ChildIsDirty(nsIFrame* aChild) override;
#ifdef ACCESSIBILITY
mozilla::a11y::AccType AccessibleType() override;
#endif
nsStyleContext* GetParentStyleContext(nsIFrame** aProviderFrame) const override {
return DoGetParentStyleContext(aProviderFrame);
}
/**
* Do the work for getting the parent style context frame so that
* other frame's |GetParentStyleContext| methods can call this
* method on *another* frame. (This function handles out-of-flow
* frames by using the frame manager's placeholder map and it also
* handles block-within-inline and generated content wrappers.)
*
* @param aProviderFrame (out) the frame associated with the returned value
* or null if the style context is for display:contents content.
* @return The style context that should be the parent of this frame's
* style context. Null is permitted, and means that this frame's
* style context should be the root of the style context tree.
*/
nsStyleContext* DoGetParentStyleContext(nsIFrame** aProviderFrame) const;
bool IsEmpty() override;
bool IsSelfEmpty() override;
void MarkIntrinsicISizesDirty() override;
nscoord GetMinISize(gfxContext *aRenderingContext) override;
nscoord GetPrefISize(gfxContext *aRenderingContext) override;
void AddInlineMinISize(gfxContext *aRenderingContext,
InlineMinISizeData *aData) override;
void AddInlinePrefISize(gfxContext *aRenderingContext,
InlinePrefISizeData *aData) override;
IntrinsicISizeOffsetData IntrinsicISizeOffsets() override;
mozilla::IntrinsicSize GetIntrinsicSize() override;
nsSize GetIntrinsicRatio() override;
mozilla::LogicalSize
ComputeSize(gfxContext* aRenderingContext,
mozilla::WritingMode aWM,
const mozilla::LogicalSize& aCBSize,
nscoord aAvailableISize,
const mozilla::LogicalSize& aMargin,
const mozilla::LogicalSize& aBorder,
const mozilla::LogicalSize& aPadding,
ComputeSizeFlags aFlags) override;
/**
* Calculate the used values for 'width' and 'height' for a replaced element.
* http://www.w3.org/TR/CSS21/visudet.html#min-max-widths
*/
mozilla::LogicalSize
ComputeSizeWithIntrinsicDimensions(
gfxContext* aRenderingContext,
mozilla::WritingMode aWM,
const mozilla::IntrinsicSize& aIntrinsicSize,
nsSize aIntrinsicRatio,
const mozilla::LogicalSize& aCBSize,
const mozilla::LogicalSize& aMargin,
const mozilla::LogicalSize& aBorder,
const mozilla::LogicalSize& aPadding,
ComputeSizeFlags aFlags);
// Compute tight bounds assuming this frame honours its border, background
// and outline, its children's tight bounds, and nothing else.
nsRect ComputeSimpleTightBounds(mozilla::gfx::DrawTarget* aDrawTarget) const;
/**
* A helper, used by |nsFrame::ComputeSize| (for frames that need to
* override only this part of ComputeSize), that computes the size
* that should be returned when 'width', 'height', and
* min/max-width/height are all 'auto' or equivalent.
*
* In general, frames that can accept any computed width/height should
* override only ComputeAutoSize, and frames that cannot do so need to
* override ComputeSize to enforce their width/height invariants.
*
* Implementations may optimize by returning a garbage width if
* StylePosition()->mWidth.GetUnit() != eStyleUnit_Auto, and
* likewise for height, since in such cases the result is guaranteed
* to be unused.
*/
virtual mozilla::LogicalSize
ComputeAutoSize(gfxContext* aRenderingContext,
mozilla::WritingMode aWM,
const mozilla::LogicalSize& aCBSize,
nscoord aAvailableISize,
const mozilla::LogicalSize& aMargin,
const mozilla::LogicalSize& aBorder,
const mozilla::LogicalSize& aPadding,
ComputeSizeFlags aFlags);
/**
* Utility function for ComputeAutoSize implementations. Return
* max(GetMinISize(), min(aISizeInCB, GetPrefISize()))
*/
nscoord ShrinkWidthToFit(gfxContext* aRenderingContext,
nscoord aISizeInCB,
ComputeSizeFlags aFlags);
/**
* Calculates the size of this frame after reflowing (calling Reflow on, and
* updating the size and position of) its children, as necessary. The
* calculated size is returned to the caller via the ReflowOutput
* outparam. (The caller is responsible for setting the actual size and
* position of this frame.)
*
* A frame's children must _all_ be reflowed if the frame is dirty (the
* NS_FRAME_IS_DIRTY bit is set on it). Otherwise, individual children
* must be reflowed if they are dirty or have the NS_FRAME_HAS_DIRTY_CHILDREN
* bit set on them. Otherwise, whether children need to be reflowed depends
* on the frame's type (it's up to individual Reflow methods), and on what
* has changed. For example, a change in the width of the frame may require
* all of its children to be reflowed (even those without dirty bits set on
* them), whereas a change in its height might not.
* (ReflowInput::ShouldReflowAllKids may be helpful in deciding whether
* to reflow all the children, but for some frame types it might result in
* over-reflow.)
*
* Note: if it's only the overflow rect(s) of a frame that need to be
* updated, then UpdateOverflow should be called instead of Reflow.
*/
void Reflow(nsPresContext* aPresContext,
ReflowOutput& aDesiredSize,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus) override;
void DidReflow(nsPresContext* aPresContext,
const ReflowInput* aReflowInput) override;
/**
* NOTE: aStatus is assumed to be already-initialized. The reflow statuses of
* any reflowed absolute children will be merged into aStatus; aside from
* that, this method won't modify aStatus.
*/
void ReflowAbsoluteFrames(nsPresContext* aPresContext,
ReflowOutput& aDesiredSize,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus,
bool aConstrainBSize = true);
void FinishReflowWithAbsoluteFrames(nsPresContext* aPresContext,
ReflowOutput& aDesiredSize,
const ReflowInput& aReflowInput,
nsReflowStatus& aStatus,
bool aConstrainBSize = true);
/*
* If this frame is dirty, marks all absolutely-positioned children of this
* frame dirty. If this frame isn't dirty, or if there are no
* absolutely-positioned children, does nothing.
*
* It's necessary to use PushDirtyBitToAbsoluteFrames() when you plan to
* reflow this frame's absolutely-positioned children after the dirty bit on
* this frame has already been cleared, which prevents ReflowInput from
* propagating the dirty bit normally. This situation generally only arises
* when a multipass layout algorithm is used.
*/
void PushDirtyBitToAbsoluteFrames();
bool CanContinueTextRun() const override;
bool ComputeCustomOverflow(nsOverflowAreas& aOverflowAreas) override;
void UnionChildOverflow(nsOverflowAreas& aOverflowAreas) override;
// Selection Methods
NS_IMETHOD HandlePress(nsPresContext* aPresContext,
mozilla::WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus);
NS_IMETHOD HandleMultiplePress(nsPresContext* aPresContext,
mozilla::WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus,
bool aControlHeld);
NS_IMETHOD HandleDrag(nsPresContext* aPresContext,
mozilla::WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus);
NS_IMETHOD HandleRelease(nsPresContext* aPresContext,
mozilla::WidgetGUIEvent* aEvent,
nsEventStatus* aEventStatus);
enum { SELECT_ACCUMULATE = 0x01 };
nsresult PeekBackwardAndForward(nsSelectionAmount aAmountBack,
nsSelectionAmount aAmountForward,
int32_t aStartPos,
bool aJumpLines,
uint32_t aSelectFlags);
nsresult SelectByTypeAtPoint(nsPresContext* aPresContext,
const nsPoint& aPoint,
nsSelectionAmount aBeginAmountType,
nsSelectionAmount aEndAmountType,
uint32_t aSelectFlags);
// Helper for GetContentAndOffsetsFromPoint; calculation of content offsets
// in this function assumes there is no child frame that can be targeted.
virtual ContentOffsets CalcContentOffsetsFromFramePoint(const nsPoint& aPoint);
// Box layout methods
nsSize GetXULPrefSize(nsBoxLayoutState& aBoxLayoutState) override;
nsSize GetXULMinSize(nsBoxLayoutState& aBoxLayoutState) override;
nsSize GetXULMaxSize(nsBoxLayoutState& aBoxLayoutState) override;
nscoord GetXULFlex() override;
nscoord GetXULBoxAscent(nsBoxLayoutState& aBoxLayoutState) override;
// We compute and store the HTML content's overflow area. So don't
// try to compute it in the box code.
bool ComputesOwnOverflowArea() override { return true; }
//--------------------------------------------------
// Additional methods
// Helper function that tests if the frame tree is too deep; if it is
// it marks the frame as "unflowable", zeroes out the metrics, sets
// the reflow status, and returns true. Otherwise, the frame is
// unmarked "unflowable" and the metrics and reflow status are not
// touched and false is returned.
bool IsFrameTreeTooDeep(const ReflowInput& aReflowInput,
ReflowOutput& aMetrics,
nsReflowStatus& aStatus);
// Incorporate the child overflow areas into aOverflowAreas.
// If the child does not have a overflow, use the child area.
void ConsiderChildOverflow(nsOverflowAreas& aOverflowAreas,
nsIFrame* aChildFrame);
/**
* @return true if we should avoid a page/column break in this frame.
*/
bool ShouldAvoidBreakInside(const ReflowInput& aReflowInput) const {
return !aReflowInput.mFlags.mIsTopOfPage &&
NS_STYLE_PAGE_BREAK_AVOID == StyleDisplay()->mBreakInside &&
!GetPrevInFlow();
}
#ifdef DEBUG
/**
* Tracing method that writes a method enter/exit routine to the
* nspr log using the nsIFrame log module. The tracing is only
* done when the NS_FRAME_TRACE_CALLS bit is set in the log module's
* level field.
*/
void Trace(const char* aMethod, bool aEnter);
void Trace(const char* aMethod, bool aEnter, const nsReflowStatus& aStatus);
void TraceMsg(const char* fmt, ...) MOZ_FORMAT_PRINTF(2, 3);
// Helper function that verifies that each frame in the list has the
// NS_FRAME_IS_DIRTY bit set
static void VerifyDirtyBitSet(const nsFrameList& aFrameList);
// Display Reflow Debugging
static void* DisplayReflowEnter(nsPresContext* aPresContext,
nsIFrame* aFrame,
const ReflowInput& aReflowInput);
static void* DisplayLayoutEnter(nsIFrame* aFrame);
static void* DisplayIntrinsicISizeEnter(nsIFrame* aFrame,
const char* aType);
static void* DisplayIntrinsicSizeEnter(nsIFrame* aFrame,
const char* aType);
static void DisplayReflowExit(nsPresContext* aPresContext,
nsIFrame* aFrame,
ReflowOutput& aMetrics,
const nsReflowStatus& aStatus,
void* aFrameTreeNode);
static void DisplayLayoutExit(nsIFrame* aFrame,
void* aFrameTreeNode);
static void DisplayIntrinsicISizeExit(nsIFrame* aFrame,
const char* aType,
nscoord aResult,
void* aFrameTreeNode);
static void DisplayIntrinsicSizeExit(nsIFrame* aFrame,
const char* aType,
nsSize aResult,
void* aFrameTreeNode);
static void DisplayReflowStartup();
static void DisplayReflowShutdown();
#endif
/**
* Adds display items for standard CSS background if necessary.
* Does not check IsVisibleForPainting.
* @param aForceBackground draw the background even if the frame
* background style appears to have no background --- this is useful
* for frames that might receive a propagated background via
* nsCSSRendering::FindBackground
* @return whether a themed background item was created.
*/
bool DisplayBackgroundUnconditional(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists,
bool aForceBackground);
/**
* Adds display items for standard CSS borders, background and outline for
* for this frame, as necessary. Checks IsVisibleForPainting and won't
* display anything if the frame is not visible.
* @param aForceBackground draw the background even if the frame
* background style appears to have no background --- this is useful
* for frames that might receive a propagated background via
* nsCSSRendering::FindBackground
*/
void DisplayBorderBackgroundOutline(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists,
bool aForceBackground = false);
/**
* Add a display item for the CSS outline. Does not check visibility.
*/
void DisplayOutlineUnconditional(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists);
/**
* Add a display item for the CSS outline, after calling
* IsVisibleForPainting to confirm we are visible.
*/
void DisplayOutline(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aLists);
/**
* Adjust the given parent frame to the right style context parent frame for
* the child, given the pseudo-type of the prospective child. This handles
* things like walking out of table pseudos and so forth.
*
* @param aProspectiveParent what GetParent() on the child returns.
* Must not be null.
* @param aChildPseudo the child's pseudo type, if any.
*/
static nsIFrame*
CorrectStyleParentFrame(nsIFrame* aProspectiveParent, nsAtom* aChildPseudo);
protected:
// Protected constructor and destructor
nsFrame(nsStyleContext* aContext, ClassID aID);
explicit nsFrame(nsStyleContext* aContext)
: nsFrame(aContext, ClassID::nsFrame_id) {}
virtual ~nsFrame();
/**
* To be called by |BuildDisplayLists| of this class or derived classes to add
* a translucent overlay if this frame's content is selected.
* @param aContentType an nsISelectionDisplay DISPLAY_ constant identifying
* which kind of content this is for
*/
void DisplaySelectionOverlay(nsDisplayListBuilder* aBuilder,
nsDisplayList* aList, uint16_t aContentType = nsISelectionDisplay::DISPLAY_FRAMES);
int16_t DisplaySelection(nsPresContext* aPresContext, bool isOkToTurnOn = false);
// Style post processing hook
void DidSetStyleContext(nsStyleContext* aOldStyleContext) override;
public:
/**
* Helper method to create a view for a frame. Only used by a few sub-classes
* that need a view.
*/
void CreateView();
//given a frame five me the first/last leaf available
//XXX Robert O'Callahan wants to move these elsewhere
static void GetLastLeaf(nsPresContext* aPresContext, nsIFrame **aFrame);
static void GetFirstLeaf(nsPresContext* aPresContext, nsIFrame **aFrame);
// Return the line number of the aFrame, and (optionally) the containing block
// frame.
// If aScrollLock is true, don't break outside scrollframes when looking for a
// containing block frame.
static int32_t GetLineNumber(nsIFrame *aFrame,
bool aLockScroll,
nsIFrame** aContainingBlock = nullptr);
/**
* Returns true if aFrame should apply overflow clipping.
*/
static bool ShouldApplyOverflowClipping(const nsIFrame* aFrame,
const nsStyleDisplay* aDisp)
{
// clip overflow:-moz-hidden-unscrollable, except for nsListControlFrame,
// which is an nsHTMLScrollFrame.
if (MOZ_UNLIKELY(aDisp->mOverflowX == NS_STYLE_OVERFLOW_CLIP &&
!aFrame->IsListControlFrame())) {
return true;
}
// and overflow:hidden that we should interpret as -moz-hidden-unscrollable
if (aDisp->mOverflowX == NS_STYLE_OVERFLOW_HIDDEN &&
aDisp->mOverflowY == NS_STYLE_OVERFLOW_HIDDEN) {
// REVIEW: these are the frame types that set up clipping.
mozilla::LayoutFrameType type = aFrame->Type();
if (type == mozilla::LayoutFrameType::Table ||
type == mozilla::LayoutFrameType::TableCell ||
type == mozilla::LayoutFrameType::BCTableCell ||
type == mozilla::LayoutFrameType::SVGOuterSVG ||
type == mozilla::LayoutFrameType::SVGInnerSVG ||
type == mozilla::LayoutFrameType::SVGSymbol ||
type == mozilla::LayoutFrameType::SVGForeignObject) {
return true;
}
if (aFrame->IsFrameOfType(nsIFrame::eReplacedContainsBlock)) {
if (type == mozilla::LayoutFrameType::TextInput) {
// It always has an anonymous scroll frame that handles any overflow.
return false;
}
return true;
}
}
if ((aFrame->GetStateBits() & NS_FRAME_SVG_LAYOUT)) {
return false;
}
// If we're paginated and a block, and have NS_BLOCK_CLIP_PAGINATED_OVERFLOW
// set, then we want to clip our overflow.
return (aFrame->GetStateBits() & NS_BLOCK_CLIP_PAGINATED_OVERFLOW) != 0 &&
aFrame->PresContext()->IsPaginated() && aFrame->IsBlockFrame();
}
nsILineIterator* GetLineIterator() override;
protected:
// Test if we are selecting a table object:
// Most table/cell selection requires that Ctrl (Cmd on Mac) key is down
// during a mouse click or drag. Exception is using Shift+click when
// already in "table/cell selection mode" to extend a block selection
// Get the parent content node and offset of the frame
// of the enclosing cell or table (if not inside a cell)
// aTarget tells us what table element to select (currently only cell and table supported)
// (enums for this are defined in nsIFrame.h)
NS_IMETHOD GetDataForTableSelection(const nsFrameSelection* aFrameSelection,
nsIPresShell* aPresShell,
mozilla::WidgetMouseEvent* aMouseEvent,
nsIContent** aParentContent,
int32_t* aContentOffset,
int32_t* aTarget);
// Fills aCursor with the appropriate information from ui
static void FillCursorInformationFromStyle(const nsStyleUserInterface* ui,
nsIFrame::Cursor& aCursor);
NS_IMETHOD DoXULLayout(nsBoxLayoutState& aBoxLayoutState) override;
#ifdef DEBUG_LAYOUT
void GetBoxName(nsAutoString& aName) override;
#endif
nsBoxLayoutMetrics* BoxMetrics() const;
// Fire DOM event. If no aContent argument use frame's mContent.
void FireDOMEvent(const nsAString& aDOMEventName, nsIContent *aContent = nullptr);
private:
void BoxReflow(nsBoxLayoutState& aState,
nsPresContext* aPresContext,
ReflowOutput& aDesiredSize,
gfxContext* aRenderingContext,
nscoord aX,
nscoord aY,
nscoord aWidth,
nscoord aHeight,
bool aMoveFrame = true);
NS_IMETHODIMP RefreshSizeCache(nsBoxLayoutState& aState);
// Returns true if this frame has any kind of CSS animations.
bool HasCSSAnimations();
// Returns true if this frame has any kind of CSS transitions.
bool HasCSSTransitions();
#ifdef DEBUG_FRAME_DUMP
public:
/**
* Get a printable from of the name of the frame type.
* XXX This should be eliminated and we use GetType() instead...
*/
nsresult GetFrameName(nsAString& aResult) const override;
nsresult MakeFrameName(const nsAString& aKind, nsAString& aResult) const;
// Helper function to return the index in parent of the frame's content
// object. Returns -1 on error or if the frame doesn't have a content object
static int32_t ContentIndexInContainer(const nsIFrame* aFrame);
#endif
#ifdef DEBUG
public:
/**
* See if style tree verification is enabled. To enable style tree
* verification add "styleverifytree:1" to your MOZ_LOG
* environment variable (any non-zero debug level will work). Or,
* call SetVerifyStyleTreeEnable with true.
*/
static bool GetVerifyStyleTreeEnable();
/**
* Set the verify-style-tree enable flag.
*/
static void SetVerifyStyleTreeEnable(bool aEnabled);
static mozilla::LazyLogModule sFrameLogModule;
// Show frame borders when rendering
static void ShowFrameBorders(bool aEnable);
static bool GetShowFrameBorders();
// Show frame border of event target
static void ShowEventTargetFrameBorder(bool aEnable);
static bool GetShowEventTargetFrameBorder();
#endif
public:
static void PrintDisplayList(nsDisplayListBuilder* aBuilder,
const nsDisplayList& aList,
bool aDumpHtml = false)
{
std::stringstream ss;
PrintDisplayList(aBuilder, aList, ss, aDumpHtml);
fprintf_stderr(stderr, "%s", ss.str().c_str());
}
static void PrintDisplayList(nsDisplayListBuilder* aBuilder,
const nsDisplayList& aList,
std::stringstream& aStream,
bool aDumpHtml = false);
static void PrintDisplayListSet(nsDisplayListBuilder* aBuilder,
const nsDisplayListSet& aList,
std::stringstream& aStream,
bool aDumpHtml = false);
};
// Start Display Reflow Debugging
#ifdef DEBUG
struct DR_cookie {
DR_cookie(nsPresContext* aPresContext,
nsIFrame* aFrame,
const mozilla::ReflowInput& aReflowInput,
mozilla::ReflowOutput& aMetrics,
nsReflowStatus& aStatus);
~DR_cookie();
void Change() const;
nsPresContext* mPresContext;
nsIFrame* mFrame;
const mozilla::ReflowInput& mReflowInput;
mozilla::ReflowOutput& mMetrics;
nsReflowStatus& mStatus;
void* mValue;
};
struct DR_layout_cookie {
explicit DR_layout_cookie(nsIFrame* aFrame);
~DR_layout_cookie();
nsIFrame* mFrame;
void* mValue;
};
struct DR_intrinsic_width_cookie {
DR_intrinsic_width_cookie(nsIFrame* aFrame, const char* aType,
nscoord& aResult);
~DR_intrinsic_width_cookie();
nsIFrame* mFrame;
const char* mType;
nscoord& mResult;
void* mValue;
};
struct DR_intrinsic_size_cookie {
DR_intrinsic_size_cookie(nsIFrame* aFrame, const char* aType,
nsSize& aResult);
~DR_intrinsic_size_cookie();
nsIFrame* mFrame;
const char* mType;
nsSize& mResult;
void* mValue;
};
struct DR_init_constraints_cookie {
DR_init_constraints_cookie(nsIFrame* aFrame, mozilla::ReflowInput* aState,
nscoord aCBWidth, nscoord aCBHeight,
const nsMargin* aBorder,
const nsMargin* aPadding);
~DR_init_constraints_cookie();
nsIFrame* mFrame;
mozilla::ReflowInput* mState;
void* mValue;
};
struct DR_init_offsets_cookie {
DR_init_offsets_cookie(nsIFrame* aFrame, mozilla::SizeComputationInput* aState,
nscoord aPercentBasis,
mozilla::WritingMode aCBWritingMode,
const nsMargin* aBorder,
const nsMargin* aPadding);
~DR_init_offsets_cookie();
nsIFrame* mFrame;
mozilla::SizeComputationInput* mState;
void* mValue;
};
struct DR_init_type_cookie {
DR_init_type_cookie(nsIFrame* aFrame, mozilla::ReflowInput* aState);
~DR_init_type_cookie();
nsIFrame* mFrame;
mozilla::ReflowInput* mState;
void* mValue;
};
#define DISPLAY_REFLOW(dr_pres_context, dr_frame, dr_rf_state, dr_rf_metrics, dr_rf_status) \
DR_cookie dr_cookie(dr_pres_context, dr_frame, dr_rf_state, dr_rf_metrics, dr_rf_status);
#define DISPLAY_REFLOW_CHANGE() \
dr_cookie.Change();
#define DISPLAY_LAYOUT(dr_frame) \
DR_layout_cookie dr_cookie(dr_frame);
#define DISPLAY_MIN_WIDTH(dr_frame, dr_result) \
DR_intrinsic_width_cookie dr_cookie(dr_frame, "Min", dr_result)
#define DISPLAY_PREF_WIDTH(dr_frame, dr_result) \
DR_intrinsic_width_cookie dr_cookie(dr_frame, "Pref", dr_result)
#define DISPLAY_PREF_SIZE(dr_frame, dr_result) \
DR_intrinsic_size_cookie dr_cookie(dr_frame, "Pref", dr_result)
#define DISPLAY_MIN_SIZE(dr_frame, dr_result) \
DR_intrinsic_size_cookie dr_cookie(dr_frame, "Min", dr_result)
#define DISPLAY_MAX_SIZE(dr_frame, dr_result) \
DR_intrinsic_size_cookie dr_cookie(dr_frame, "Max", dr_result)
#define DISPLAY_INIT_CONSTRAINTS(dr_frame, dr_state, dr_cbw, dr_cbh, \
dr_bdr, dr_pad) \
DR_init_constraints_cookie dr_cookie(dr_frame, dr_state, dr_cbw, dr_cbh, \
dr_bdr, dr_pad)
#define DISPLAY_INIT_OFFSETS(dr_frame, dr_state, dr_pb, dr_cbwm, dr_bdr, \
dr_pad) \
DR_init_offsets_cookie dr_cookie(dr_frame, dr_state, dr_pb, dr_cbwm, \
dr_bdr, dr_pad)
#define DISPLAY_INIT_TYPE(dr_frame, dr_result) \
DR_init_type_cookie dr_cookie(dr_frame, dr_result)
#else
#define DISPLAY_REFLOW(dr_pres_context, dr_frame, dr_rf_state, dr_rf_metrics, dr_rf_status)
#define DISPLAY_REFLOW_CHANGE()
#define DISPLAY_LAYOUT(dr_frame) PR_BEGIN_MACRO PR_END_MACRO
#define DISPLAY_MIN_WIDTH(dr_frame, dr_result) PR_BEGIN_MACRO PR_END_MACRO
#define DISPLAY_PREF_WIDTH(dr_frame, dr_result) PR_BEGIN_MACRO PR_END_MACRO
#define DISPLAY_PREF_SIZE(dr_frame, dr_result) PR_BEGIN_MACRO PR_END_MACRO
#define DISPLAY_MIN_SIZE(dr_frame, dr_result) PR_BEGIN_MACRO PR_END_MACRO
#define DISPLAY_MAX_SIZE(dr_frame, dr_result) PR_BEGIN_MACRO PR_END_MACRO
#define DISPLAY_INIT_CONSTRAINTS(dr_frame, dr_state, dr_cbw, dr_cbh, \
dr_bdr, dr_pad) \
PR_BEGIN_MACRO PR_END_MACRO
#define DISPLAY_INIT_OFFSETS(dr_frame, dr_state, dr_pb, dr_cbwm, dr_bdr, \
dr_pad) \
PR_BEGIN_MACRO PR_END_MACRO
#define DISPLAY_INIT_TYPE(dr_frame, dr_result) PR_BEGIN_MACRO PR_END_MACRO
#endif
// End Display Reflow Debugging
// similar to NS_ENSURE_TRUE but with no return value
#define ENSURE_TRUE(x) \
PR_BEGIN_MACRO \
if (!(x)) { \
NS_WARNING("ENSURE_TRUE(" #x ") failed"); \
return; \
} \
PR_END_MACRO
#endif /* nsFrame_h___ */
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