gecko-dev/layout/generic/nsInlineFrame.h
Benjamin Smedberg 3498a5f86e Bug 396185 - Make nsIFrame derivatives and helper abstract classes use a different dynamic-cast system than nsISupports:
* we know all types frames may be cast to at compile time, so instead of extensible GUID IIDs, use a big enum (see nsQueryFrame::FrameIID)
* eliminate all vestiges of refcounting, since frames aren't refcounted

Some frames (SVG frames in particular) still implement nsISupports-derived interfaces, for example nsISVGValue. There is a FrameIID for nsISVGValue that lets you go from a frame to the XPCOM interface, but you can't query back.

r+sr=roc

nsITextControlFrame didn't have an IID the first time around, but this wasn't a compile error because nsITextControlFrame::kFrameIID inherited from nsIFormControlFrame::kFrameIID. I've added a static analysis pass to verify the correct behavior, since I can't figure out a way to make the compiler do it.

--HG--
extra : rebase_source : 4894a2ca0278e2ab92f27459db77165f8348cf41
2009-01-12 14:20:59 -05:00

287 lines
10 KiB
C++

/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* ***** BEGIN LICENSE BLOCK *****
* Version: MPL 1.1/GPL 2.0/LGPL 2.1
*
* The contents of this file are subject to the Mozilla Public License Version
* 1.1 (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
* http://www.mozilla.org/MPL/
*
* Software distributed under the License is distributed on an "AS IS" basis,
* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
* for the specific language governing rights and limitations under the
* License.
*
* The Original Code is Mozilla Communicator client code.
*
* The Initial Developer of the Original Code is
* Netscape Communications Corporation.
* Portions created by the Initial Developer are Copyright (C) 1998
* the Initial Developer. All Rights Reserved.
*
* Contributor(s):
*
* Alternatively, the contents of this file may be used under the terms of
* either of the GNU General Public License Version 2 or later (the "GPL"),
* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
* in which case the provisions of the GPL or the LGPL are applicable instead
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* the provisions above, a recipient may use your version of this file under
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*
* ***** END LICENSE BLOCK ***** */
/* rendering object for CSS display:inline objects */
#ifndef nsInlineFrame_h___
#define nsInlineFrame_h___
#include "nsHTMLContainerFrame.h"
#include "nsAbsoluteContainingBlock.h"
#include "nsLineLayout.h"
class nsAnonymousBlockFrame;
#define nsInlineFrameSuper nsHTMLContainerFrame
// NS_INLINE_FRAME_HARD_TEXT_OFFSETS is used for access keys, where what
// would normally be 1 text frame is split into 3 sets of an inline parent
// and text child (the pre access key text, the underlined key text, and
// the post access key text). The offsets of the 3 text frame children
// are set in nsCSSFrameConstructor
#define NS_INLINE_FRAME_HARD_TEXT_OFFSETS 0x00100000
/** In Bidi left (or right) margin/padding/border should be applied to left
* (or right) most frame (or a continuation frame).
* This state value shows if this frame is left (or right) most continuation
* or not.
*/
#define NS_INLINE_FRAME_BIDI_VISUAL_STATE_IS_SET 0x00200000
#define NS_INLINE_FRAME_BIDI_VISUAL_IS_LEFT_MOST 0x00400000
#define NS_INLINE_FRAME_BIDI_VISUAL_IS_RIGHT_MOST 0x00800000
/**
* Inline frame class.
*
* This class manages a list of child frames that are inline frames. Working with
* nsLineLayout, the class will reflow and place inline frames on a line.
*/
class nsInlineFrame : public nsInlineFrameSuper
{
public:
NS_DECLARE_FRAME_ACCESSOR(nsInlineFrame)
NS_DECL_QUERYFRAME
friend nsIFrame* NS_NewInlineFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
// nsIFrame overrides
NS_IMETHOD BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists);
#ifdef ACCESSIBILITY
NS_IMETHODIMP GetAccessible(nsIAccessible** aAccessible);
#endif
#ifdef DEBUG
NS_IMETHOD GetFrameName(nsAString& aResult) const;
#endif
virtual nsIAtom* GetType() const;
virtual PRBool IsFrameOfType(PRUint32 aFlags) const
{
return nsInlineFrameSuper::IsFrameOfType(aFlags &
~(nsIFrame::eBidiInlineContainer | nsIFrame::eLineParticipant));
}
virtual PRBool IsEmpty();
virtual PRBool IsSelfEmpty();
virtual PRBool PeekOffsetCharacter(PRBool aForward, PRInt32* aOffset);
// nsIHTMLReflow overrides
virtual void AddInlineMinWidth(nsIRenderingContext *aRenderingContext,
InlineMinWidthData *aData);
virtual void AddInlinePrefWidth(nsIRenderingContext *aRenderingContext,
InlinePrefWidthData *aData);
virtual nsSize ComputeSize(nsIRenderingContext *aRenderingContext,
nsSize aCBSize, nscoord aAvailableWidth,
nsSize aMargin, nsSize aBorder, nsSize aPadding,
PRBool aShrinkWrap);
virtual nsRect ComputeTightBounds(gfxContext* aContext) const;
NS_IMETHOD Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus);
virtual PRBool CanContinueTextRun() const;
// Take all of the frames away from this frame. The caller is
// presumed to keep them alive.
void StealAllFrames() {
mFrames.SetFrames(nsnull);
}
/**
* Return true if the frame is leftmost frame or continuation.
*/
PRBool IsLeftMost() const {
// If the frame's bidi visual state is set, return is-leftmost state
// else return true if it's the first continuation.
return (GetStateBits() & NS_INLINE_FRAME_BIDI_VISUAL_STATE_IS_SET)
? !!(GetStateBits() & NS_INLINE_FRAME_BIDI_VISUAL_IS_LEFT_MOST)
: (!GetPrevInFlow());
}
/**
* Return true if the frame is rightmost frame or continuation.
*/
PRBool IsRightMost() const {
// If the frame's bidi visual state is set, return is-rightmost state
// else return true if it's the last continuation.
return (GetStateBits() & NS_INLINE_FRAME_BIDI_VISUAL_STATE_IS_SET)
? !!(GetStateBits() & NS_INLINE_FRAME_BIDI_VISUAL_IS_RIGHT_MOST)
: (!GetNextInFlow());
}
protected:
// Additional reflow state used during our reflow methods
struct InlineReflowState {
nsIFrame* mPrevFrame;
nsInlineFrame* mNextInFlow;
nsIFrame* mLineContainer;
PRPackedBool mSetParentPointer; // when reflowing child frame first set its
// parent frame pointer
InlineReflowState() {
mPrevFrame = nsnull;
mNextInFlow = nsnull;
mLineContainer = nsnull;
mSetParentPointer = PR_FALSE;
}
};
nsInlineFrame(nsStyleContext* aContext) : nsInlineFrameSuper(aContext) {}
virtual PRIntn GetSkipSides() const;
nsresult ReflowFrames(nsPresContext* aPresContext,
const nsHTMLReflowState& aReflowState,
InlineReflowState& rs,
nsHTMLReflowMetrics& aMetrics,
nsReflowStatus& aStatus);
nsresult ReflowInlineFrame(nsPresContext* aPresContext,
const nsHTMLReflowState& aReflowState,
InlineReflowState& rs,
nsIFrame* aFrame,
nsReflowStatus& aStatus);
/**
* Reparent floats whose placeholders are inline descendants of aFrame from
* whatever block they're currently parented by to aOurBlock.
* @param aReparentSiblings if this is true, we follow aFrame's
* GetNextSibling chain reparenting them all
*/
void ReparentFloatsForInlineChild(nsIFrame* aOurBlock, nsIFrame* aFrame,
PRBool aReparentSiblings);
virtual nsIFrame* PullOneFrame(nsPresContext* aPresContext,
InlineReflowState& rs,
PRBool* aIsComplete);
virtual void PushFrames(nsPresContext* aPresContext,
nsIFrame* aFromChild,
nsIFrame* aPrevSibling);
};
//----------------------------------------------------------------------
/**
* Variation on inline-frame used to manage lines for line layout in
* special situations (:first-line style in particular).
*/
class nsFirstLineFrame : public nsInlineFrame {
public:
friend nsIFrame* NS_NewFirstLineFrame(nsIPresShell* aPresShell, nsStyleContext* aContext);
#ifdef DEBUG
NS_IMETHOD GetFrameName(nsAString& aResult) const;
#endif
virtual nsIAtom* GetType() const;
NS_IMETHOD Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus);
// Take frames starting at aFrame until the end of the frame-list
// away from this frame. The caller is presumed to keep them alive.
void StealFramesFrom(nsIFrame* aFrame);
protected:
nsFirstLineFrame(nsStyleContext* aContext) : nsInlineFrame(aContext) {}
virtual nsIFrame* PullOneFrame(nsPresContext* aPresContext,
InlineReflowState& rs,
PRBool* aIsComplete);
};
//----------------------------------------------------------------------
// Derived class created for relatively positioned inline-level elements
// that acts as a containing block for child absolutely positioned
// elements
class nsPositionedInlineFrame : public nsInlineFrame
{
public:
nsPositionedInlineFrame(nsStyleContext* aContext)
: nsInlineFrame(aContext)
, mAbsoluteContainer(nsGkAtoms::absoluteList)
{}
virtual ~nsPositionedInlineFrame() { } // useful for debugging
virtual void Destroy();
NS_IMETHOD SetInitialChildList(nsIAtom* aListName,
nsIFrame* aChildList);
NS_IMETHOD AppendFrames(nsIAtom* aListName,
nsIFrame* aFrameList);
NS_IMETHOD InsertFrames(nsIAtom* aListName,
nsIFrame* aPrevFrame,
nsIFrame* aFrameList);
NS_IMETHOD RemoveFrame(nsIAtom* aListName,
nsIFrame* aOldFrame);
NS_IMETHOD BuildDisplayList(nsDisplayListBuilder* aBuilder,
const nsRect& aDirtyRect,
const nsDisplayListSet& aLists);
virtual nsIAtom* GetAdditionalChildListName(PRInt32 aIndex) const;
virtual nsIFrame* GetFirstChild(nsIAtom* aListName) const;
NS_IMETHOD Reflow(nsPresContext* aPresContext,
nsHTMLReflowMetrics& aDesiredSize,
const nsHTMLReflowState& aReflowState,
nsReflowStatus& aStatus);
virtual nsIAtom* GetType() const;
virtual PRBool NeedsView() { return PR_TRUE; }
protected:
nsAbsoluteContainingBlock mAbsoluteContainer;
};
#endif /* nsInlineFrame_h___ */