зеркало из https://github.com/mozilla/pjs.git
269 строки
11 KiB
C++
269 строки
11 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set shiftwidth=2 tabstop=8 autoindent cindent expandtab: */
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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 an implementation of CSS3 text-overflow.
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*
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* The Initial Developer of the Original Code is the Mozilla Foundation.
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* Portions created by the Initial Developer are Copyright (C) 2011
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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* Mats Palmgren <matspal@gmail.com> (original author)
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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 the GNU General Public License Version 2 or later (the "GPL"), or
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* 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 TextOverflow_h_
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#define TextOverflow_h_
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#include "nsDisplayList.h"
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#include "nsLineBox.h"
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#include "nsStyleStruct.h"
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#include "nsTHashtable.h"
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class nsIScrollableFrame;
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namespace mozilla {
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namespace css {
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/**
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* A class for rendering CSS3 text-overflow.
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* Usage:
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* 1. allocate an object using WillProcessLines
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* 2. then call ProcessLine for each line you are building display lists for
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*/
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class TextOverflow {
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public:
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/**
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* Allocate an object for text-overflow processing.
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* @return nsnull if no processing is necessary. The caller owns the object.
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*/
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static TextOverflow* WillProcessLines(nsDisplayListBuilder* aBuilder,
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const nsDisplayListSet& aLists,
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nsIFrame* aBlockFrame);
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/**
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* Analyze the display lists for text overflow and what kind of item is at
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* the content edges. Add display items for text-overflow markers as needed
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* and remove or clip items that would overlap a marker.
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*/
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void ProcessLine(const nsDisplayListSet& aLists, nsLineBox* aLine);
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/**
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* @return true if aBlockFrame needs analysis for text overflow.
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*/
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static bool CanHaveTextOverflow(nsDisplayListBuilder* aBuilder,
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nsIFrame* aBlockFrame);
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typedef nsTHashtable<nsPtrHashKey<nsIFrame> > FrameHashtable;
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protected:
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TextOverflow() {}
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void Init(nsDisplayListBuilder* aBuilder,
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const nsDisplayListSet& aLists,
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nsIFrame* aBlockFrame);
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struct AlignmentEdges {
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AlignmentEdges() : mAssigned(false) {}
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void Accumulate(const nsRect& aRect) {
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if (NS_LIKELY(mAssigned)) {
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x = NS_MIN(x, aRect.X());
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xmost = NS_MAX(xmost, aRect.XMost());
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} else {
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x = aRect.X();
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xmost = aRect.XMost();
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mAssigned = true;
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}
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}
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nscoord Width() { return xmost - x; }
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nscoord x;
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nscoord xmost;
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bool mAssigned;
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};
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struct InnerClipEdges {
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InnerClipEdges() : mAssignedLeft(false), mAssignedRight(false) {}
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void AccumulateLeft(const nsRect& aRect) {
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if (NS_LIKELY(mAssignedLeft)) {
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mLeft = NS_MAX(mLeft, aRect.X());
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} else {
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mLeft = aRect.X();
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mAssignedLeft = true;
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}
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}
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void AccumulateRight(const nsRect& aRect) {
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if (NS_LIKELY(mAssignedRight)) {
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mRight = NS_MIN(mRight, aRect.XMost());
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} else {
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mRight = aRect.XMost();
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mAssignedRight = true;
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}
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}
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nscoord mLeft;
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nscoord mRight;
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bool mAssignedLeft;
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bool mAssignedRight;
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};
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/**
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* Examines frames on the line to determine whether we should draw a left
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* and/or right marker, and if so, which frames should be completely hidden
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* and the bounds of what will be displayed between the markers.
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* @param aLine the line we're processing
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* @param aFramesToHide frames that should have their display items removed
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* @param aAlignmentEdges the outermost edges of all text and atomic
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* inline-level frames that are inside the area between the markers
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*/
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void ExamineLineFrames(nsLineBox* aLine,
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FrameHashtable* aFramesToHide,
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AlignmentEdges* aAlignmentEdges);
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/**
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* LineHasOverflowingText calls this to analyze edges, both the block's
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* content edges and the hypothetical marker edges aligned at the block edges.
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* @param aFrame the descendant frame of mBlock that we're analyzing
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* @param aContentArea the block's content area
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* @param aInsideMarkersArea the rectangle between the markers
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* @param aFramesToHide frames that should have their display items removed
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* @param aAlignmentEdges the outermost edges of all text and atomic
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* inline-level frames that are inside the area between the markers
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* @param aFoundVisibleTextOrAtomic is set to true if a text or atomic
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* inline-level frame is visible between the marker edges
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* @param aClippedMarkerEdges the innermost edges of all text and atomic
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* inline-level frames that are clipped by the current marker width
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*/
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void ExamineFrameSubtree(nsIFrame* aFrame,
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const nsRect& aContentArea,
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const nsRect& aInsideMarkersArea,
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FrameHashtable* aFramesToHide,
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AlignmentEdges* aAlignmentEdges,
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bool* aFoundVisibleTextOrAtomic,
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InnerClipEdges* aClippedMarkerEdges);
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/**
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* ExamineFrameSubtree calls this to analyze a frame against the hypothetical
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* marker edges (aInsideMarkersArea) for text frames and atomic inline-level
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* elements. A text frame adds its extent inside aInsideMarkersArea where
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* grapheme clusters are fully visible. An atomic adds its border box if
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* it's fully inside aInsideMarkersArea, otherwise the frame is added to
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* aFramesToHide.
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* @param aFrame the descendant frame of mBlock that we're analyzing
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* @param aFrameType aFrame's frame type
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* @param aInsideMarkersArea the rectangle between the markers
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* @param aFramesToHide frames that should have their display items removed
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* @param aAlignmentEdges the outermost edges of all text and atomic
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* inline-level frames that are inside the area between the markers
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* inside aInsideMarkersArea
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* @param aFoundVisibleTextOrAtomic is set to true if a text or atomic
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* inline-level frame is visible between the marker edges
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* @param aClippedMarkerEdges the innermost edges of all text and atomic
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* inline-level frames that are clipped by the current marker width
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*/
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void AnalyzeMarkerEdges(nsIFrame* aFrame,
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const nsIAtom* aFrameType,
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const nsRect& aInsideMarkersArea,
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FrameHashtable* aFramesToHide,
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AlignmentEdges* aAlignmentEdges,
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bool* aFoundVisibleTextOrAtomic,
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InnerClipEdges* aClippedMarkerEdges);
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/**
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* Clip or remove items given the final marker edges. ("clip" here just means
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* assigning mLeftEdge/mRightEdge for any nsCharClipDisplayItem that needs it,
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* see nsDisplayList.h for a description of that item).
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* @param aFramesToHide remove display items for these frames
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* @param aInsideMarkersArea is the area inside the markers
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*/
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void PruneDisplayListContents(nsDisplayList* aList,
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const FrameHashtable& aFramesToHide,
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const nsRect& aInsideMarkersArea);
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/**
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* ProcessLine calls this to create display items for the markers and insert
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* them into a display list for the block.
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* @param aLine the line we're processing
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* @param aCreateLeft if true, create a marker on the left side
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* @param aCreateRight if true, create a marker on the right side
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* @param aInsideMarkersArea is the area inside the markers
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*/
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void CreateMarkers(const nsLineBox* aLine,
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bool aCreateLeft,
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bool aCreateRight,
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const nsRect& aInsideMarkersArea) const;
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nsRect mContentArea;
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nsDisplayListBuilder* mBuilder;
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nsIFrame* mBlock;
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nsIScrollableFrame* mScrollableFrame;
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nsDisplayList* mMarkerList;
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bool mBlockIsRTL;
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bool mCanHaveHorizontalScrollbar;
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bool mAdjustForPixelSnapping;
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class Marker {
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public:
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void Init(const nsStyleTextOverflowSide& aStyle) {
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mInitialized = false;
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mWidth = 0;
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mStyle = &aStyle;
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}
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/**
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* Setup the marker string and calculate its size, if not done already.
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*/
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void SetupString(nsIFrame* aFrame);
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bool IsNeeded() const {
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return mHasOverflow;
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}
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void Reset() {
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mHasOverflow = false;
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}
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// The current width of the marker, the range is [0 .. mIntrinsicWidth].
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nscoord mWidth;
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// The intrinsic width of the marker string.
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nscoord mIntrinsicWidth;
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// The marker text.
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nsString mMarkerString;
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// The style for this side.
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const nsStyleTextOverflowSide* mStyle;
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// True if there is visible overflowing inline content on this side.
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bool mHasOverflow;
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// True if mMarkerString and mWidth have been setup from style.
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bool mInitialized;
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// True if the style is text-overflow:clip on this side and the marker
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// won't cause the line to become empty.
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bool mActive;
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};
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Marker mLeft; // the horizontal left marker
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Marker mRight; // the horizontal right marker
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};
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} // namespace css
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} // namespace mozilla
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#endif /* !defined(TextOverflow_h_) */
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