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242 lines
9.2 KiB
C++
242 lines
9.2 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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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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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 "nsTHashtable.h"
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#include "mozilla/Likely.h"
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#include <algorithm>
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class nsIScrollableFrame;
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class gfxTextRun;
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class nsLineBox;
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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 nullptr 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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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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* Get the resulting text-overflow markers (the list may be empty).
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* @return a DisplayList containing any text-overflow markers.
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*/
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nsDisplayList& GetMarkers() { return mMarkerList; }
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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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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 (MOZ_LIKELY(mAssigned)) {
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x = std::min(x, aRect.X());
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xmost = std::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 (MOZ_LIKELY(mAssignedLeft)) {
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mLeft = std::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 (MOZ_LIKELY(mAssignedRight)) {
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mRight = std::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 mMarkerList.
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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);
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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.
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nscoord mIntrinsicWidth;
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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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