mirror of
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494 lines
20 KiB
C++
494 lines
20 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either of the GNU General Public License Version 2 or later (the "GPL"),
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* or the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the MPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsHTMLReflowState_h___
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#define nsHTMLReflowState_h___
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#include "nsMargin.h"
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#include "nsStyleCoord.h"
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class nsIFrame;
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class nsPresContext;
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class nsReflowPath;
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class nsIRenderingContext;
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class nsSpaceManager;
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class nsLineLayout;
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class nsIPercentHeightObserver;
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struct nsStyleDisplay;
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struct nsStyleVisibility;
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struct nsStylePosition;
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struct nsStyleBorder;
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struct nsStyleMargin;
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struct nsStylePadding;
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struct nsStyleText;
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struct nsHypotheticalBox;
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/**
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* Constant used to indicate an unconstrained size.
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*
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* @see #Reflow()
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*/
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#define NS_UNCONSTRAINEDSIZE NS_MAXSIZE
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/**
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* The reason the frame is being reflowed.
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*
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* XXX Should probably be a #define so it can be extended for specialized
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* reflow interfaces...
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*
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* @see nsHTMLReflowState
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*/
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enum nsReflowReason {
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eReflowReason_Initial = 0, // initial reflow of a newly created frame
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eReflowReason_Incremental = 1, // an incremental change has occured. see the reflow command for details
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eReflowReason_Resize = 2, // general request to determine a desired size
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eReflowReason_StyleChange = 3, // request to reflow because of a style change. Note: you must reflow
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// all your child frames
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eReflowReason_Dirty = 4 // request to reflow because you and/or your children are dirty
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};
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/**
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* CSS Frame type. Included as part of the reflow state.
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*/
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typedef PRUint32 nsCSSFrameType;
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#define NS_CSS_FRAME_TYPE_UNKNOWN 0
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#define NS_CSS_FRAME_TYPE_INLINE 1
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#define NS_CSS_FRAME_TYPE_BLOCK 2 /* block-level in normal flow */
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#define NS_CSS_FRAME_TYPE_FLOATING 3
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#define NS_CSS_FRAME_TYPE_ABSOLUTE 4
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#define NS_CSS_FRAME_TYPE_INTERNAL_TABLE 5 /* row group frame, row frame, cell frame, ... */
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/**
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* Bit-flag that indicates whether the element is replaced. Applies to inline,
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* block-level, floating, and absolutely positioned elements
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*/
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#define NS_CSS_FRAME_TYPE_REPLACED 0x8000
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/**
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* Helper macros for telling whether items are replaced
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*/
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#define NS_FRAME_IS_REPLACED(_ft) \
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(NS_CSS_FRAME_TYPE_REPLACED == ((_ft) & NS_CSS_FRAME_TYPE_REPLACED))
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#define NS_FRAME_REPLACED(_ft) \
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(NS_CSS_FRAME_TYPE_REPLACED | (_ft))
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/**
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* A macro to extract the type. Masks off the 'replaced' bit-flag
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*/
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#define NS_FRAME_GET_TYPE(_ft) \
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((_ft) & ~NS_CSS_FRAME_TYPE_REPLACED)
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#define NS_INTRINSICSIZE NS_UNCONSTRAINEDSIZE
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#define NS_SHRINKWRAPWIDTH NS_UNCONSTRAINEDSIZE
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#define NS_AUTOHEIGHT NS_UNCONSTRAINEDSIZE
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#define NS_AUTOMARGIN NS_UNCONSTRAINEDSIZE
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#define NS_AUTOOFFSET NS_UNCONSTRAINEDSIZE
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// NOTE: there are assumptions all over that these have the same value, namely NS_UNCONSTRAINEDSIZE
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// if any are changed to be a value other than NS_UNCONSTRAINEDSIZE
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// at least update AdjustComputedHeight/Width and test ad nauseum
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/**
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* Reflow state passed to a frame during reflow.
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*
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* @see nsIFrame#Reflow()
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*/
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struct nsHTMLReflowState {
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// the reflow states are linked together. this is the pointer to the
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// parent's reflow state
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const nsHTMLReflowState* parentReflowState;
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// the frame being reflowed
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nsIFrame* frame;
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// the reason for the reflow
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nsReflowReason reason;
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// the incremental reflow path, when the reflow reason is
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// eReflowReason_Incremental. Specifically, this corresponds to the
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// portion of the incremental reflow path from `frame' down. Note
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// that it is safe to assume that this is non-null: we maintain the
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// invariant that it contains a valid nsReflowPath pointer when
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// reason == eReflowReason_Incremental.
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nsReflowPath *path;
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// the available width in which to reflow the frame. The space
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// represents the amount of room for the frame's border, padding,
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// and content area (not the margin area. The parent frame deals
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// with the child frame's margins). The frame size you choose should
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// fit within the available width.
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nscoord availableWidth;
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// A value of NS_UNCONSTRAINEDSIZE for the available height means
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// you can choose whatever size you want. In galley mode the
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// available height is always NS_UNCONSTRAINEDSIZE, and only page
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// mode involves a constrained height. The element's the top border
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// and padding, and content, must fit. If the element is complete
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// after reflow then its bottom border, padding and margin (and
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// similar for its complete ancestors) will need to fit in this
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// height.
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nscoord availableHeight;
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// rendering context to use for measurement
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nsIRenderingContext* rendContext;
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// The type of frame, from css's perspective. This value is
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// initialized by the Init method below.
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nsCSSFrameType mFrameType;
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// pointer to the space manager associated with this area
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nsSpaceManager* mSpaceManager;
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// LineLayout object (only for inline reflow; set to NULL otherwise)
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nsLineLayout* mLineLayout;
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// The appropriate reflow state for the containing block (for
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// percentage widths, etc.) of this reflow state's frame.
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const nsHTMLReflowState *mCBReflowState;
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// The computed width specifies the frame's content area width, and it does
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// not apply to inline non-replaced elements
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//
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// For replaced inline frames, a value of NS_INTRINSICSIZE means you should
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// use your intrinsic width as the computed width
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//
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// For block-level frames, the computed width is based on the width of the
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// containing block, the margin/border/padding areas, and the min/max width.
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// A value of NS_SHRINKWRAPWIDTH means that you should choose a width based
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// on your content. The width may be as large as the specified maximum width
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// (see mComputedMaxWidth).
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nscoord mComputedWidth;
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// The computed height specifies the frame's content height, and it does
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// not apply to inline non-replaced elements
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//
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// For replaced inline frames, a value of NS_INTRINSICSIZE means you should
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// use your intrinsic height as the computed height
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//
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// For non-replaced block-level frames in the flow and floated, a value of
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// NS_AUTOHEIGHT means you choose a height to shrink wrap around the normal
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// flow child frames. The height must be within the limit of the min/max
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// height if there is such a limit
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//
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// For replaced block-level frames, a value of NS_INTRINSICSIZE
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// means you use your intrinsic height as the computed height
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nscoord mComputedHeight;
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// Computed margin values
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nsMargin mComputedMargin;
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// Cached copy of the border values
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nsMargin mComputedBorderPadding;
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// Computed padding values
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nsMargin mComputedPadding;
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// Computed values for 'left/top/right/bottom' offsets. Only applies to
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// 'positioned' elements
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nsMargin mComputedOffsets;
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// Computed values for 'min-width/max-width' and 'min-height/max-height'
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nscoord mComputedMinWidth, mComputedMaxWidth;
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nscoord mComputedMinHeight, mComputedMaxHeight;
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// Compact margin available space
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nscoord mCompactMarginWidth;
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// Cached pointers to the various style structs used during intialization
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const nsStyleDisplay* mStyleDisplay;
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const nsStyleVisibility* mStyleVisibility;
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const nsStylePosition* mStylePosition;
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const nsStyleBorder* mStyleBorder;
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const nsStyleMargin* mStyleMargin;
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const nsStylePadding* mStylePadding;
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const nsStyleText* mStyleText;
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// a frame (e.g. nsTableCellFrame) which may need to generate a special
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// reflow for percent height calculations
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nsIPercentHeightObserver* mPercentHeightObserver;
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// a frame (e.g. nsTableFrame) which initiates a special reflow for percent height calculations
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nsIFrame* mPercentHeightReflowInitiator;
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// CSS margin collapsing sometimes requires us to reflow
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// optimistically assuming that margins collapse to see if clearance
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// is required. When we discover that clearance is required, we
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// store the frame in which clearance was discovered to the location
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// requested here.
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nsIFrame** mDiscoveredClearance;
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// This value keeps track of how deeply nested a given reflow state
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// is from the top of the frame tree.
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PRInt16 mReflowDepth;
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struct ReflowStateFlags {
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PRUint16 mSpecialHeightReflow:1; // used by tables to communicate special reflow (in process) to handle
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// percent height frames inside cells which may not have computed heights
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PRUint16 mNextInFlowUntouched:1; // nothing in the frame's next-in-flow (or its descendants)
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// is changing
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PRUint16 mIsTopOfPage:1; // is the current context at the top of a page?
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PRUint16 mBlinks:1; // Keep track of text-decoration: blink
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PRUint16 mVisualBidiFormControl:1; // Keep track of descendants of form controls on Visual Bidi pages
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PRUint16 mHasClearance:1; // Block has clearance
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PRUint16 mAssumingHScrollbar:1; // parent frame is an nsIScrollableFrame and it
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// is assuming a horizontal scrollbar
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PRUint16 mAssumingVScrollbar:1; // parent frame is an nsIScrollableFrame and it
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// is assuming a vertical scrollbar
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} mFlags;
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#ifdef IBMBIDI
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nscoord mRightEdge;
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#endif
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#ifdef DEBUG
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// hook for attaching debug info (e.g. tables may attach a timer during reflow)
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void* mDebugHook;
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static const char* ReasonToString(nsReflowReason aReason);
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#endif
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// Note: The copy constructor is written by the compiler automatically. You
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// can use that and then override specific values if you want, or you can
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// call Init as desired...
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// Initialize a <b>root</b> reflow state with a rendering context to
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// use for measuring things.
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nsHTMLReflowState(nsPresContext* aPresContext,
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nsIFrame* aFrame,
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nsReflowReason aReason,
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nsIRenderingContext* aRenderingContext,
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const nsSize& aAvailableSpace);
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// Initialize a <b>root</b> reflow state for an <b>incremental</b>
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// reflow.
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nsHTMLReflowState(nsPresContext* aPresContext,
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nsIFrame* aFrame,
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nsReflowPath* aReflowPath,
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nsIRenderingContext* aRenderingContext,
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const nsSize& aAvailableSpace);
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// Initialize a reflow state for a child frames reflow. Some state
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// is copied from the parent reflow state; the remaining state is
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// computed.
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nsHTMLReflowState(nsPresContext* aPresContext,
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const nsHTMLReflowState& aParentReflowState,
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nsIFrame* aFrame,
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const nsSize& aAvailableSpace,
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nsReflowReason aReason,
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PRBool aInit = PR_TRUE);
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// Same as the previous except that the reason is taken from the
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// parent's reflow state.
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nsHTMLReflowState(nsPresContext* aPresContext,
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const nsHTMLReflowState& aParentReflowState,
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nsIFrame* aFrame,
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const nsSize& aAvailableSpace);
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// Used when you want to override the default containing block
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// width and height. Used by absolute positioning code
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nsHTMLReflowState(nsPresContext* aPresContext,
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const nsHTMLReflowState& aParentReflowState,
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nsIFrame* aFrame,
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const nsSize& aAvailableSpace,
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nscoord aContainingBlockWidth,
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nscoord aContainingBlockHeight,
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nsReflowReason aReason);
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// This method initializes various data members. It is automatically
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// called by the various constructors
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void Init(nsPresContext* aPresContext,
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nscoord aContainingBlockWidth = -1,
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nscoord aContainingBlockHeight = -1,
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nsMargin* aBorder = nsnull,
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nsMargin* aPadding = nsnull);
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/**
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* Find the content width of the containing block of aReflowState
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*/
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static nscoord
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GetContainingBlockContentWidth(const nsHTMLReflowState* aReflowState);
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/**
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* Adjust content MEW take into account the settings of the CSS
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* 'width', 'min-width' and 'max-width' properties.
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*/
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nscoord AdjustIntrinsicMinContentWidthForStyle(nscoord aWidth) const;
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/**
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* Adjust content maximum-width take into account the settings of
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* the CSS 'width', 'min-width' and 'max-width' properties.
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*/
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nscoord AdjustIntrinsicContentWidthForStyle(nscoord aWidth) const;
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/**
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* Find the containing block of aFrame. This may return null if
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* there isn't one (but that should really only happen for root
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* frames).
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*/
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static nsIFrame* GetContainingBlockFor(const nsIFrame* aFrame);
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/**
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* Get the page box reflow state, starting from a frames
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* <B>parent</B> reflow state (the parent reflow state may or may not end
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* up being the containing block reflow state)
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*/
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static const nsHTMLReflowState*
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GetPageBoxReflowState(const nsHTMLReflowState* aParentRS);
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/**
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* Compute the border plus padding for <TT>aFrame</TT>. If a
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* percentage needs to be computed it will be computed by finding
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* the containing block, use GetContainingBlockReflowState.
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* aParentReflowState is aFrame's
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* parent's reflow state. The resulting computed border plus padding
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* is returned in aResult.
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*/
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static void ComputeBorderPaddingFor(nsIFrame* aFrame,
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const nsHTMLReflowState* aParentRS,
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nsMargin& aResult);
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/**
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* Calculate the raw line-height property for the given frame. The return
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* value, if line-height was applied and is valid will be >= 0. Otherwise,
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* the return value will be <0 which is illegal (CSS2 spec: section 10.8.1).
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*/
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static nscoord CalcLineHeight(nsPresContext* aPresContext,
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nsIRenderingContext* aRenderingContext,
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nsIFrame* aFrame);
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void InitFrameType();
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void ComputeContainingBlockRectangle(nsPresContext* aPresContext,
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const nsHTMLReflowState* aContainingBlockRS,
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nscoord& aContainingBlockWidth,
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nscoord& aContainingBlockHeight);
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void CalculateBlockSideMargins(nscoord aAvailWidth,
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nscoord aComputedWidth);
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/**
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* Apply the mComputed(Min/Max)(Width/Height) values to the content
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* size computed so far. If a passed-in pointer is null, we skip
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* adjusting that dimension.
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*/
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void ApplyMinMaxConstraints(nscoord* aContentWidth, nscoord* aContentHeight) const;
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protected:
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void InitCBReflowState();
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void InitConstraints(nsPresContext* aPresContext,
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nscoord aContainingBlockWidth,
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nscoord aContainingBlockHeight,
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nsMargin* aBorder,
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nsMargin* aPadding);
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void CalculateHypotheticalBox(nsPresContext* aPresContext,
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nsIFrame* aPlaceholderFrame,
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nsIFrame* aContainingBlock,
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nsMargin& aBlockContentArea,
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const nsHTMLReflowState* cbrs,
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nsHypotheticalBox& aHypotheticalBox);
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void InitAbsoluteConstraints(nsPresContext* aPresContext,
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const nsHTMLReflowState* cbrs,
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nscoord aContainingBlockWidth,
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nscoord aContainingBlockHeight);
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void ComputeRelativeOffsets(const nsHTMLReflowState* cbrs,
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nscoord aContainingBlockWidth,
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nscoord aContainingBlockHeight);
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void ComputeBlockBoxData(nsPresContext* aPresContext,
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const nsHTMLReflowState* cbrs,
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nsStyleUnit aWidthUnit,
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nsStyleUnit aHeightUnit,
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nscoord aContainingBlockWidth,
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nscoord aContainingBlockHeight);
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void ComputeHorizontalValue(nscoord aContainingBlockWidth,
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nsStyleUnit aUnit,
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const nsStyleCoord& aCoord,
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nscoord& aResult);
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void ComputeVerticalValue(nscoord aContainingBlockHeight,
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nsStyleUnit aUnit,
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const nsStyleCoord& aCoord,
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nscoord& aResult);
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// Computes margin values from the specified margin style information, and
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// fills in the mComputedMargin member
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void ComputeMargin(nscoord aContainingBlockWidth,
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const nsHTMLReflowState* aContainingBlockRS);
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// Computes padding values from the specified padding style information, and
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// fills in the mComputedPadding member
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void ComputePadding(nscoord aContainingBlockWidth,
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const nsHTMLReflowState* aContainingBlockRS);
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// Calculates the computed values for the 'min-Width', 'max-Width',
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// 'min-Height', and 'max-Height' properties, and stores them in the assorted
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// data members
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void ComputeMinMaxValues(nscoord aContainingBlockWidth,
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nscoord aContainingBlockHeight,
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const nsHTMLReflowState* aContainingBlockRS);
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nscoord CalculateHorizBorderPaddingMargin(nscoord aContainingBlockWidth);
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// Adjust Computed sizes for Min/Max Width and box-Sizing (if
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// aAdjustForBoxSizing is true)
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// - guarantees that the computed height/width will be non-negative
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// If the value goes negative (because the padding or border is greater than
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// the width/height and it is removed due to box sizing) then it is driven to 0
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void AdjustComputedHeight(PRBool aAdjustForBoxSizing);
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void AdjustComputedWidth(PRBool aAdjustForBoxSizing);
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#ifdef IBMBIDI
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/**
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* Test whether the frame is a form control in a visual Bidi page.
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* This is necessary for backwards-compatibility, because most visual
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* pages use logical order for form controls so that they will
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* display correctly on native widgets in OSs with Bidi support
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* @param aPresContext the pres context
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* @return whether the frame is a BIDI form control
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*/
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PRBool IsBidiFormControl(nsPresContext* aPresContext);
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#endif
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};
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#endif /* nsHTMLReflowState_h___ */
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