forked from mirrors/gecko-dev
752 lines
32 KiB
C++
752 lines
32 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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* Boris Zbarsky <bzbarsky@mit.edu>.
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* Portions created by the Initial Developer are Copyright (C) 2002
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Boris Zbarsky <bzbarsky@mit.edu> (original author)
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* L. David Baron <dbaron@dbaron.org>, Mozilla Corporation
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* Mats Palmgren <mats.palmgren@bredband.net>
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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 nsLayoutUtils_h__
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#define nsLayoutUtils_h__
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class nsIFormControlFrame;
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class nsPresContext;
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class nsIContent;
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class nsIAtom;
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class nsIScrollableView;
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class nsIScrollableFrame;
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class nsIDOMEvent;
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class nsRegion;
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class nsDisplayListBuilder;
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class nsIFontMetrics;
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#include "prtypes.h"
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#include "nsStyleContext.h"
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#include "nsAutoPtr.h"
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#include "nsStyleSet.h"
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#include "nsIView.h"
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#include "nsIFrame.h"
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class nsBlockFrame;
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/**
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* nsLayoutUtils is a namespace class used for various helper
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* functions that are useful in multiple places in layout. The goal
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* is not to define multiple copies of the same static helper.
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*/
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class nsLayoutUtils
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{
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public:
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/**
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* GetBeforeFrame returns the :before frame of the given frame, if
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* one exists. This is typically O(1). The frame passed in must be
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* the first-in-flow.
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*
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* @param aFrame the frame whose :before is wanted
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* @return the :before frame or nsnull if there isn't one
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*/
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static nsIFrame* GetBeforeFrame(nsIFrame* aFrame);
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/**
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* GetAfterFrame returns the :after frame of the given frame, if one
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* exists. This will walk the in-flow chain to the last-in-flow if
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* needed. This function is typically O(N) in the number of child
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* frames, following in-flows, etc.
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*
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* @param aFrame the frame whose :after is wanted
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* @return the :after frame or nsnull if there isn't one
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*/
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static nsIFrame* GetAfterFrame(nsIFrame* aFrame);
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/**
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* Given a frame, search up the frame tree until we find an
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* ancestor that (or the frame itself) is of type aFrameType, if any.
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*
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* @param aFrame the frame to start at
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* @param aFrameType the frame type to look for
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* @return a frame of the given type or nsnull if no
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* such ancestor exists
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*/
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static nsIFrame* GetClosestFrameOfType(nsIFrame* aFrame, nsIAtom* aFrameType);
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/**
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* Given a frame, search up the frame tree until we find an
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* ancestor that (or the frame itself) is a "Page" frame, if any.
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*
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* @param aFrame the frame to start at
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* @return a frame of type nsGkAtoms::pageFrame or nsnull if no
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* such ancestor exists
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*/
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static nsIFrame* GetPageFrame(nsIFrame* aFrame)
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{
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return GetClosestFrameOfType(aFrame, nsGkAtoms::pageFrame);
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}
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/**
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* IsGeneratedContentFor returns PR_TRUE if aFrame is generated
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* content of type aPseudoElement for aContent
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*
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* @param aContent the content node we're looking at. If this is
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* null, then we just assume that aFrame has the right content
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* pointer.
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* @param aFrame the frame we're looking at
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* @param aPseudoElement the pseudo type we're interested in
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* @return whether aFrame is the generated aPseudoElement frame for aContent
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*/
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static PRBool IsGeneratedContentFor(nsIContent* aContent, nsIFrame* aFrame,
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nsIAtom* aPseudoElement);
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/**
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* CompareTreePosition determines whether aContent1 comes before or
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* after aContent2 in a preorder traversal of the content tree.
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*
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* @param aCommonAncestor either null, or a common ancestor of
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* aContent1 and aContent2. Actually this is
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* only a hint; if it's not an ancestor of
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* aContent1 or aContent2, this function will
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* still work, but it will be slower than
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* normal.
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* @return < 0 if aContent1 is before aContent2
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* > 0 if aContent1 is after aContent2,
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* 0 otherwise (meaning they're the same, or they're in
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* different documents)
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*/
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static PRInt32 CompareTreePosition(nsIContent* aContent1,
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nsIContent* aContent2,
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nsIContent* aCommonAncestor = nsnull)
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{
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return DoCompareTreePosition(aContent1, aContent2, -1, 1, aCommonAncestor);
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}
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/*
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* More generic version of |CompareTreePosition|. |aIf1Ancestor|
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* gives the value to return when 1 is an ancestor of 2, and likewise
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* for |aIf2Ancestor|. Passing (-1, 1) gives preorder traversal
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* order, and (1, -1) gives postorder traversal order.
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*/
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static PRInt32 DoCompareTreePosition(nsIContent* aContent1,
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nsIContent* aContent2,
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PRInt32 aIf1Ancestor,
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PRInt32 aIf2Ancestor,
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nsIContent* aCommonAncestor = nsnull);
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/**
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* CompareTreePosition determines whether aFrame1 comes before or
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* after aFrame2 in a preorder traversal of the frame tree, where out
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* of flow frames are treated as children of their placeholders. This is
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* basically the same ordering as DoCompareTreePosition(nsIContent*) except
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* that it handles anonymous content properly and there are subtleties with
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* continuations.
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*
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* @param aCommonAncestor either null, or a common ancestor of
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* aContent1 and aContent2. Actually this is
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* only a hint; if it's not an ancestor of
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* aContent1 or aContent2, this function will
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* still work, but it will be slower than
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* normal.
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* @return < 0 if aContent1 is before aContent2
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* > 0 if aContent1 is after aContent2,
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* 0 otherwise (meaning they're the same, or they're in
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* different frame trees)
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*/
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static PRInt32 CompareTreePosition(nsIFrame* aFrame1,
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nsIFrame* aFrame2,
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nsIFrame* aCommonAncestor = nsnull)
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{
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return DoCompareTreePosition(aFrame1, aFrame2, -1, 1, aCommonAncestor);
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}
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/*
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* More generic version of |CompareTreePosition|. |aIf1Ancestor|
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* gives the value to return when 1 is an ancestor of 2, and likewise
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* for |aIf2Ancestor|. Passing (-1, 1) gives preorder traversal
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* order, and (1, -1) gives postorder traversal order.
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*/
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static PRInt32 DoCompareTreePosition(nsIFrame* aFrame1,
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nsIFrame* aFrame2,
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PRInt32 aIf1Ancestor,
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PRInt32 aIf2Ancestor,
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nsIFrame* aCommonAncestor = nsnull);
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/**
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* GetLastSibling simply finds the last sibling of aFrame, or returns nsnull if
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* aFrame is null.
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*/
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static nsIFrame* GetLastSibling(nsIFrame* aFrame);
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/**
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* FindSiblingViewFor locates the child of aParentView that aFrame's
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* view should be inserted 'above' (i.e., before in sibling view
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* order). This is the first child view of aParentView whose
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* corresponding content is before aFrame's content (view siblings
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* are in reverse content order).
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*/
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static nsIView* FindSiblingViewFor(nsIView* aParentView, nsIFrame* aFrame);
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/**
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* Get the parent of aFrame. If aFrame is the root frame for a document,
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* and the document has a parent document in the same view hierarchy, then
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* we try to return the subdocumentframe in the parent document.
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*/
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static nsIFrame* GetCrossDocParentFrame(nsIFrame* aFrame);
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/**
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* IsProperAncestorFrame checks whether aAncestorFrame is an ancestor
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* of aFrame and not equal to aFrame.
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* @param aCommonAncestor nsnull, or a common ancestor of aFrame and
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* aAncestorFrame. If non-null, this can bound the search and speed up
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* the function
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*/
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static PRBool IsProperAncestorFrame(nsIFrame* aAncestorFrame, nsIFrame* aFrame,
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nsIFrame* aCommonAncestor = nsnull);
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/**
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* Like IsProperAncestorFrame, but looks across document boundaries.
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*/
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static PRBool IsProperAncestorFrameCrossDoc(nsIFrame* aAncestorFrame, nsIFrame* aFrame,
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nsIFrame* aCommonAncestor = nsnull);
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/**
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* GetFrameFor returns the root frame for a view
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* @param aView is the view to return the root frame for
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* @return the root frame for the view
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*/
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static nsIFrame* GetFrameFor(nsIView *aView)
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{ return static_cast<nsIFrame*>(aView->GetClientData()); }
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/**
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* GetScrollableFrameFor returns the scrollable frame for a scrollable view
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* @param aScrollableView is the scrollable view to return the
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* scrollable frame for.
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* @return the scrollable frame for the scrollable view
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*/
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static nsIScrollableFrame* GetScrollableFrameFor(nsIScrollableView *aScrollableView);
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/**
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* GetScrollableFrameFor returns the scrollable frame for a scrolled frame
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*/
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static nsIScrollableFrame* GetScrollableFrameFor(nsIFrame *aScrolledFrame);
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static nsPresContext::ScrollbarStyles
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ScrollbarStylesOfView(nsIScrollableView *aScrollableView);
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/**
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* GetNearestScrollingView locates the first ancestor of aView (or
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* aView itself) that is scrollable. It does *not* count an
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* 'overflow' style of 'hidden' as scrollable, even though a scrolling
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* view is present. Thus, the direction of the scroll is needed as
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* an argument.
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*
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* @param aView the view we're looking at
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* @param aDirection Whether it's for horizontal or vertical scrolling.
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* @return the nearest scrollable view or nsnull if not found
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*/
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enum Direction { eHorizontal, eVertical, eEither };
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static nsIScrollableView* GetNearestScrollingView(nsIView* aView,
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Direction aDirection);
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/**
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* HasPseudoStyle returns PR_TRUE if aContent (whose primary style
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* context is aStyleContext) has the aPseudoElement pseudo-style
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* attached to it; returns PR_FALSE otherwise.
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*
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* @param aContent the content node we're looking at
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* @param aStyleContext aContent's style context
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* @param aPseudoElement the name of the pseudo style we care about
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* @param aPresContext the presentation context
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* @return whether aContent has aPseudoElement style attached to it
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*/
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static PRBool HasPseudoStyle(nsIContent* aContent,
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nsStyleContext* aStyleContext,
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nsIAtom* aPseudoElement,
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nsPresContext* aPresContext)
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{
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NS_PRECONDITION(aPresContext, "Must have a prescontext");
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NS_PRECONDITION(aPseudoElement, "Must have a pseudo name");
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nsRefPtr<nsStyleContext> pseudoContext;
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if (aContent) {
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pseudoContext = aPresContext->StyleSet()->
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ProbePseudoStyleFor(aContent, aPseudoElement, aStyleContext);
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}
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return pseudoContext != nsnull;
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}
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/**
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* If this frame is a placeholder for a float, then return the float,
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* otherwise return nsnull.
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*/
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static nsIFrame* GetFloatFromPlaceholder(nsIFrame* aPossiblePlaceholder);
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// Combine aNewBreakType with aOrigBreakType, but limit the break types
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// to NS_STYLE_CLEAR_LEFT, RIGHT, LEFT_AND_RIGHT.
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static PRUint8 CombineBreakType(PRUint8 aOrigBreakType, PRUint8 aNewBreakType);
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/**
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* @return PR_TRUE if aFrame is the CSS initial containing block for
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* its pres-shell
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*/
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static PRBool IsInitialContainingBlock(nsIFrame* aFrame);
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/**
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* Get the coordinates of a given DOM mouse event, relative to a given
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* frame. Works only for DOM events generated by nsGUIEvents.
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* @param aDOMEvent the event
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* @param aFrame the frame to make coordinates relative to
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* @return the point, or (NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE) if
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* for some reason the coordinates for the mouse are not known (e.g.,
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* the event is not a GUI event).
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*/
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static nsPoint GetDOMEventCoordinatesRelativeTo(nsIDOMEvent* aDOMEvent,
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nsIFrame* aFrame);
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/**
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* Get the coordinates of a given native mouse event, relative to a given
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* frame.
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* @param aEvent the event
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* @param aFrame the frame to make coordinates relative to
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* @return the point, or (NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE) if
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* for some reason the coordinates for the mouse are not known (e.g.,
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* the event is not a GUI event).
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*/
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static nsPoint GetEventCoordinatesRelativeTo(const nsEvent* aEvent,
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nsIFrame* aFrame);
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/**
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* Get the coordinates of a given native mouse event, relative to the nearest
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* view for a given frame.
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* The "nearest view" is the view returned by nsFrame::GetOffsetFromView.
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* XXX this is extremely BOGUS because "nearest view" is a mess; every
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* use of this method is really a bug!
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* @param aEvent the event
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* @param aFrame the frame to make coordinates relative to
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* @param aView view to which returned coordinates are relative
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* @return the point, or (NS_UNCONSTRAINEDSIZE, NS_UNCONSTRAINEDSIZE) if
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* for some reason the coordinates for the mouse are not known (e.g.,
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* the event is not a GUI event).
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*/
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static nsPoint GetEventCoordinatesForNearestView(nsEvent* aEvent,
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nsIFrame* aFrame,
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nsIView** aView = nsnull);
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/**
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* Translate from widget coordinates to the view's coordinates
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* @param aPresContext the PresContext for the view
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* @param aWidget the widget
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* @param aPt the point relative to the widget
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* @param aView view to which returned coordinates are relative
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* @return the point in the view's coordinates
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*/
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static nsPoint TranslateWidgetToView(nsPresContext* aPresContext,
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nsIWidget* aWidget, nsIntPoint aPt,
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nsIView* aView);
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/**
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* Given aFrame, the root frame of a stacking context, find its descendant
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* frame under the point aPt that receives a mouse event at that location,
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* or nsnull if there is no such frame.
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* @param aPt the point, relative to the frame origin
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* @param aShouldIgnoreSuppression a boolean to control if the display
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* list builder should ignore paint suppression or not
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*/
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static nsIFrame* GetFrameForPoint(nsIFrame* aFrame, nsPoint aPt,
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PRBool aShouldIgnoreSuppression = PR_FALSE);
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/**
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* Given aFrame, the root frame of a stacking context, paint it and its
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* descendants to aRenderingContext.
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* @param aRenderingContext a rendering context translated so that (0,0)
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* is the origin of aFrame
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* @param aDirtyRegion the region that must be painted, in the coordinates
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* of aFrame
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* @param aBackground paint the dirty area with this color before drawing
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* the actual content; pass NS_RGBA(0,0,0,0) to draw no background
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*/
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static nsresult PaintFrame(nsIRenderingContext* aRenderingContext, nsIFrame* aFrame,
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const nsRegion& aDirtyRegion, nscolor aBackground);
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/**
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* @param aRootFrame the root frame of the tree to be displayed
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* @param aMovingFrame a frame that has moved
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* @param aPt the amount by which aMovingFrame has moved and the rect will
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* be copied
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* @param aCopyRect a rectangle that will be copied, relative to aRootFrame
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* @param aRepaintRegion a subregion of aCopyRect+aDelta that must be repainted
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* after doing the bitblt
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*
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* Ideally this function would actually have the rect-to-copy as an output
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* rather than an input, but for now, scroll bitblitting is limited to
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* the whole of a single widget, so we cannot choose the rect.
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*
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* This function assumes that the caller will do a bitblt copy of aCopyRect
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* to aCopyRect+aPt. It computes a region that must be repainted in order
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* for the resulting rendering to be correct.
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*
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* The region consists of:
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* a) any visible background-attachment:fixed areas in the after-move display
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* list
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* b) any visible areas of the before-move display list corresponding to
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* frames that will not move (translated by aDelta)
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* c) any visible areas of the after-move display list corresponding to
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* frames that did not move
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* d) except that if the same display list element is visible in b) and c)
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* for a frame that did not move and paints a uniform color within its
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* bounds, then the intersection of its old and new bounds can be excluded
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* when it is processed by b) and c).
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*
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* We may return a larger region if computing the above region precisely is
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* too expensive.
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*/
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static nsresult ComputeRepaintRegionForCopy(nsIFrame* aRootFrame,
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nsIFrame* aMovingFrame,
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nsPoint aDelta,
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const nsRect& aCopyRect,
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nsRegion* aRepaintRegion);
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/**
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* Compute the used z-index of aFrame; returns zero for elements to which
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* z-index does not apply, and for z-index:auto
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*/
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static PRInt32 GetZIndex(nsIFrame* aFrame);
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/**
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* Uses a binary search for find where the cursor falls in the line of text
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* It also keeps track of the part of the string that has already been measured
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* so it doesn't have to keep measuring the same text over and over
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*
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* @param "aBaseWidth" contains the width in twips of the portion
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* of the text that has already been measured, and aBaseInx contains
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* the index of the text that has already been measured.
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*
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* @param aTextWidth returns the (in twips) the length of the text that falls
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* before the cursor aIndex contains the index of the text where the cursor falls
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*/
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static PRBool
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BinarySearchForPosition(nsIRenderingContext* acx,
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const PRUnichar* aText,
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PRInt32 aBaseWidth,
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PRInt32 aBaseInx,
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PRInt32 aStartInx,
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|
PRInt32 aEndInx,
|
|
PRInt32 aCursorPos,
|
|
PRInt32& aIndex,
|
|
PRInt32& aTextWidth);
|
|
|
|
/**
|
|
* Get the union of all rects in aFrame and its continuations, relative
|
|
* to aFrame's origin. Scrolling is taken into account, but this shouldn't
|
|
* matter because it should be impossible to have some continuations scrolled
|
|
* differently from others.
|
|
*/
|
|
static nsRect GetAllInFlowBoundingRect(nsIFrame* aFrame);
|
|
|
|
/**
|
|
* Get the font metrics corresponding to the frame's style data.
|
|
* @param aFrame the frame
|
|
* @param aFontMetrics the font metrics result
|
|
* @return success or failure code
|
|
*/
|
|
static nsresult GetFontMetricsForFrame(nsIFrame* aFrame,
|
|
nsIFontMetrics** aFontMetrics);
|
|
|
|
/**
|
|
* Get the font metrics corresponding to the given style data.
|
|
* @param aStyleContext the style data
|
|
* @param aFontMetrics the font metrics result
|
|
* @return success or failure code
|
|
*/
|
|
static nsresult GetFontMetricsForStyleContext(nsStyleContext* aStyleContext,
|
|
nsIFontMetrics** aFontMetrics);
|
|
|
|
/**
|
|
* Find the immediate child of aParent whose frame subtree contains
|
|
* aDescendantFrame. Returns null if aDescendantFrame is not a descendant
|
|
* of aParent.
|
|
*/
|
|
static nsIFrame* FindChildContainingDescendant(nsIFrame* aParent, nsIFrame* aDescendantFrame);
|
|
|
|
/**
|
|
* Find the nearest ancestor that's a block
|
|
*/
|
|
static nsBlockFrame* FindNearestBlockAncestor(nsIFrame* aFrame);
|
|
|
|
/**
|
|
* Cast aFrame to an nsBlockFrame* or return null if it's not
|
|
* an nsBlockFrame.
|
|
*/
|
|
static nsBlockFrame* GetAsBlock(nsIFrame* aFrame);
|
|
|
|
/**
|
|
* If aFrame is an out of flow frame, return its placeholder, otherwise
|
|
* return its parent.
|
|
*/
|
|
static nsIFrame* GetParentOrPlaceholderFor(nsFrameManager* aFrameManager,
|
|
nsIFrame* aFrame);
|
|
|
|
/**
|
|
* Find the closest common ancestor of aFrame1 and aFrame2, following
|
|
* out of flow frames to their placeholders instead of their parents. Returns
|
|
* nsnull if the frames are in different frame trees.
|
|
*
|
|
* @param aKnownCommonAncestorHint a frame that is believed to be on the
|
|
* ancestor chain of both aFrame1 and aFrame2. If null, or a frame that is
|
|
* not in fact on both ancestor chains, then this function will still return
|
|
* the correct result, but it will be slower.
|
|
*/
|
|
static nsIFrame*
|
|
GetClosestCommonAncestorViaPlaceholders(nsIFrame* aFrame1, nsIFrame* aFrame2,
|
|
nsIFrame* aKnownCommonAncestorHint);
|
|
|
|
/**
|
|
* Get a frame's next-in-flow, or, if it doesn't have one, its special sibling.
|
|
*/
|
|
static nsIFrame*
|
|
GetNextContinuationOrSpecialSibling(nsIFrame *aFrame);
|
|
|
|
/**
|
|
* Check whether aFrame is a part of the scrollbar or scrollcorner of
|
|
* the root content.
|
|
* @param aFrame the checking frame
|
|
* @return if TRUE, the frame is a part of the scrollbar or scrollcorner of
|
|
* the root content.
|
|
*/
|
|
static PRBool IsViewportScrollbarFrame(nsIFrame* aFrame);
|
|
|
|
/**
|
|
* Return the value of aStyle as an nscoord if it can be determined without
|
|
* reference to ancestors or children (e.g. is not a percentage width)
|
|
* @param aStyle the style coord
|
|
* @param aRenderingContext the rendering context to use for font measurement
|
|
* @param aFrame the frame whose style context should be used for font information
|
|
* @param aResult the nscoord value of the style coord
|
|
* @return TRUE if the unit is eStyleUnit_Coord or eStyleUnit_Chars
|
|
*/
|
|
static PRBool GetAbsoluteCoord(const nsStyleCoord& aStyle,
|
|
nsIRenderingContext* aRenderingContext,
|
|
nsIFrame* aFrame,
|
|
nscoord& aResult)
|
|
{
|
|
return GetAbsoluteCoord(aStyle, aRenderingContext,
|
|
aFrame->GetStyleContext(), aResult);
|
|
}
|
|
|
|
/**
|
|
* Same as above but doesn't need a frame
|
|
*/
|
|
static PRBool GetAbsoluteCoord(const nsStyleCoord& aStyle,
|
|
nsIRenderingContext* aRenderingContext,
|
|
nsStyleContext* aStyleContext,
|
|
nscoord& aResult);
|
|
/**
|
|
* Get the contribution of aFrame to its containing block's intrinsic
|
|
* width. This considers the child's intrinsic width, its 'width',
|
|
* 'min-width', and 'max-width' properties, and its padding, border,
|
|
* and margin.
|
|
*/
|
|
enum IntrinsicWidthType { MIN_WIDTH, PREF_WIDTH };
|
|
static nscoord IntrinsicForContainer(nsIRenderingContext* aRenderingContext,
|
|
nsIFrame* aFrame,
|
|
IntrinsicWidthType aType);
|
|
|
|
/*
|
|
* Convert nsStyleCoord to nscoord when percentages depend on the
|
|
* containing block width.
|
|
*/
|
|
static nscoord ComputeWidthDependentValue(
|
|
nsIRenderingContext* aRenderingContext,
|
|
nsIFrame* aFrame,
|
|
nscoord aContainingBlockWidth,
|
|
const nsStyleCoord& aCoord);
|
|
|
|
/*
|
|
* Convert nsStyleCoord to nscoord when percentages depend on the
|
|
* containing block width, and enumerated values are for width,
|
|
* min-width, or max-width. Returns the content-box width value based
|
|
* on aContentEdgeToBoxSizing and aBoxSizingToMarginEdge (which are
|
|
* also used for the enumerated values for width. This function does
|
|
* not handle 'auto'. It ensures that the result is nonnegative.
|
|
*
|
|
* @param aRenderingContext Rendering context for font measurement/metrics.
|
|
* @param aFrame Frame whose (min-/max-/)width is being computed
|
|
* @param aContainingBlockWidth Width of aFrame's containing block.
|
|
* @param aContentEdgeToBoxSizing The sum of any left/right padding and
|
|
* border that goes inside the rect chosen by -moz-box-sizing.
|
|
* @param aBoxSizingToMarginEdge The sum of any left/right padding, border,
|
|
* and margin that goes outside the rect chosen by -moz-box-sizing.
|
|
* @param aCoord The width value to compute.
|
|
*/
|
|
static nscoord ComputeWidthValue(
|
|
nsIRenderingContext* aRenderingContext,
|
|
nsIFrame* aFrame,
|
|
nscoord aContainingBlockWidth,
|
|
nscoord aContentEdgeToBoxSizing,
|
|
nscoord aBoxSizingToMarginEdge,
|
|
const nsStyleCoord& aCoord);
|
|
|
|
/*
|
|
* Convert nsStyleCoord to nscoord when percentages depend on the
|
|
* containing block height.
|
|
*/
|
|
static nscoord ComputeHeightDependentValue(
|
|
nsIRenderingContext* aRenderingContext,
|
|
nsIFrame* aFrame,
|
|
nscoord aContainingBlockHeight,
|
|
const nsStyleCoord& aCoord);
|
|
|
|
/*
|
|
* Calculate the used values for 'width' and 'height' for a replaced element.
|
|
*
|
|
* http://www.w3.org/TR/CSS21/visudet.html#min-max-widths
|
|
*/
|
|
static nsSize ComputeSizeWithIntrinsicDimensions(
|
|
nsIRenderingContext* aRenderingContext, nsIFrame* aFrame,
|
|
const nsIFrame::IntrinsicSize& aIntrinsicSize,
|
|
nsSize aIntrinsicRatio, nsSize aCBSize,
|
|
nsSize aMargin, nsSize aBorder, nsSize aPadding);
|
|
|
|
// Implement nsIFrame::GetPrefWidth in terms of nsIFrame::AddInlinePrefWidth
|
|
static nscoord PrefWidthFromInline(nsIFrame* aFrame,
|
|
nsIRenderingContext* aRenderingContext);
|
|
|
|
// Implement nsIFrame::GetMinWidth in terms of nsIFrame::AddInlineMinWidth
|
|
static nscoord MinWidthFromInline(nsIFrame* aFrame,
|
|
nsIRenderingContext* aRenderingContext);
|
|
|
|
static void DrawString(const nsIFrame* aFrame,
|
|
nsIRenderingContext* aContext,
|
|
const PRUnichar* aString,
|
|
PRInt32 aLength,
|
|
nsPoint aPoint);
|
|
|
|
static nscoord GetStringWidth(const nsIFrame* aFrame,
|
|
nsIRenderingContext* aContext,
|
|
const PRUnichar* aString,
|
|
PRInt32 aLength);
|
|
|
|
/**
|
|
* Derive a baseline of |aFrame| (measured from its top border edge)
|
|
* from its first in-flow line box (not descending into anything with
|
|
* 'overflow' not 'visible', potentially including aFrame itself).
|
|
*
|
|
* Returns true if a baseline was found (and fills in aResult).
|
|
* Otherwise returns false.
|
|
*/
|
|
static PRBool GetFirstLineBaseline(const nsIFrame* aFrame, nscoord* aResult);
|
|
|
|
/**
|
|
* Derive a baseline of |aFrame| (measured from its top border edge)
|
|
* from its last in-flow line box (not descending into anything with
|
|
* 'overflow' not 'visible', potentially including aFrame itself).
|
|
*
|
|
* Returns true if a baseline was found (and fills in aResult).
|
|
* Otherwise returns false.
|
|
*/
|
|
static PRBool GetLastLineBaseline(const nsIFrame* aFrame, nscoord* aResult);
|
|
|
|
/**
|
|
* Gets the closest frame (the frame passed in or one of its parents) that
|
|
* qualifies as a "layer"; used in DOM0 methods that depends upon that
|
|
* definition. This is the nearest frame that is either positioned or scrolled
|
|
* (the child of a scroll frame). In Gecko terms, it's approximately
|
|
* equivalent to having a view, at least for simple HTML. However, views are
|
|
* going away, so this is a cleaner definition.
|
|
*/
|
|
static nsIFrame* GetClosestLayer(nsIFrame* aFrame);
|
|
|
|
/**
|
|
* Draw a single image.
|
|
* @param aRenderingContext Where to draw the image, set up with an
|
|
* appropriate scale and transform for drawing in
|
|
* app units (aDestRect).
|
|
* @param aImage The image.
|
|
* @param aDestRect Where to draw the image (app units).
|
|
* @param aDirtyRect Draw only within this region (rounded to the
|
|
* nearest pixel); the intersection of
|
|
* invalidation and clipping.
|
|
* @param aSourceRect If null, draw the entire image so it fits in
|
|
* aDestRect. If non-null, the subregion of the
|
|
* image that should be drawn (in app units, such
|
|
* that converting it to CSS pixels yields image
|
|
* pixels).
|
|
*/
|
|
static nsresult DrawImage(nsIRenderingContext* aRenderingContext,
|
|
imgIContainer* aImage,
|
|
const nsRect& aDestRect,
|
|
const nsRect& aDirtyRect,
|
|
const nsRect* aSourceRect = nsnull);
|
|
|
|
/**
|
|
* Set the font on aRC based on the style in aSC
|
|
*/
|
|
static void SetFontFromStyle(nsIRenderingContext* aRC, nsStyleContext* aSC);
|
|
|
|
/**
|
|
* Convert an eStyleUnit_Chars nsStyleCoord to an nscoord.
|
|
*
|
|
* @param aStyle the style coord
|
|
* @param aRenderingContext the rendering context to use for font measurement
|
|
* @param aStyleContext the style context to use for font infomation
|
|
*/
|
|
static nscoord CharsToCoord(const nsStyleCoord& aStyle,
|
|
nsIRenderingContext* aRenderingContext,
|
|
nsStyleContext* aStyleContext);
|
|
|
|
/**
|
|
* Determine if any style coordinate is nonzero
|
|
* @param aCoord the style sides
|
|
* @return PR_TRUE unless all the coordinates are 0%, 0 or null.
|
|
*/
|
|
static PRBool HasNonZeroSide(const nsStyleSides& aSides);
|
|
|
|
/**
|
|
* Determine if a widget is likely to require transparency or translucency.
|
|
* @param aFrame the frame of a <window>, <popup> or <menupopup> element.
|
|
* @return a value suitable for passing to SetWindowTranslucency
|
|
*/
|
|
static PRBool FrameHasTransparency(nsIFrame* aFrame);
|
|
|
|
/**
|
|
* Get textrun construction flags determined by a given style; in particular
|
|
* some combination of:
|
|
* -- TEXT_DISABLE_OPTIONAL_LIGATURES if letter-spacing is in use
|
|
* -- TEXT_OPTIMIZE_SPEED if the text-rendering CSS property and font size
|
|
* and prefs indicate we should be optimizing for speed over quality
|
|
*/
|
|
static PRUint32 GetTextRunFlagsForStyle(nsStyleContext* aStyleContext,
|
|
const nsStyleText* aStyleText,
|
|
const nsStyleFont* aStyleFont);
|
|
};
|
|
|
|
#endif // nsLayoutUtils_h__
|