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text.cpp
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/*
This file is part of Telegram Desktop,
the official desktop version of Telegram messaging app, see https://telegram.org
Telegram Desktop is free software: you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation, either version 3 of the License, or
(at your option) any later version.
It is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
In addition, as a special exception, the copyright holders give permission
to link the code of portions of this program with the OpenSSL library.
Full license: https://github.com/telegramdesktop/tdesktop/blob/master/LICENSE
Copyright (c) 2014-2017 John Preston, https://desktop.telegram.org
*/
#include "ui/text/text.h"
#include <private/qharfbuzz_p.h>
#include "core/click_handler_types.h"
#include "ui/text/text_block.h"
#include "lang/lang_keys.h"
#include "platform/platform_specific.h"
#include "boxes/confirm_box.h"
#include "mainwindow.h"
namespace {
inline int32 countBlockHeight(const ITextBlock *b, const style::TextStyle *st) {
return (b->type() == TextBlockTSkip) ? static_cast<const SkipBlock*>(b)->height() : (st->lineHeight > st->font->height) ? st->lineHeight : st->font->height;
}
} // namespace
QString textcmdSkipBlock(ushort w, ushort h) {
static QString cmd(5, TextCommand);
cmd[1] = QChar(TextCommandSkipBlock);
cmd[2] = QChar(w);
cmd[3] = QChar(h);
return cmd;
}
QString textcmdStartLink(ushort lnkIndex) {
static QString cmd(4, TextCommand);
cmd[1] = QChar(TextCommandLinkIndex);
cmd[2] = QChar(lnkIndex);
return cmd;
}
QString textcmdStartLink(const QString &url) {
if (url.size() >= 4096) return QString();
QString result;
result.reserve(url.size() + 4);
return result.append(TextCommand).append(QChar(TextCommandLinkText)).append(QChar(url.size())).append(url).append(TextCommand);
}
QString textcmdStopLink() {
return textcmdStartLink(0);
}
QString textcmdLink(ushort lnkIndex, const QString &text) {
QString result;
result.reserve(4 + text.size() + 4);
return result.append(textcmdStartLink(lnkIndex)).append(text).append(textcmdStopLink());
}
QString textcmdLink(const QString &url, const QString &text) {
QString result;
result.reserve(4 + url.size() + text.size() + 4);
return result.append(textcmdStartLink(url)).append(text).append(textcmdStopLink());
}
QString textcmdStartSemibold() {
QString result;
result.reserve(3);
return result.append(TextCommand).append(QChar(TextCommandSemibold)).append(TextCommand);
}
QString textcmdStopSemibold() {
QString result;
result.reserve(3);
return result.append(TextCommand).append(QChar(TextCommandNoSemibold)).append(TextCommand);
}
const QChar *textSkipCommand(const QChar *from, const QChar *end, bool canLink) {
const QChar *result = from + 1;
if (*from != TextCommand || result >= end) return from;
ushort cmd = result->unicode();
++result;
if (result >= end) return from;
switch (cmd) {
case TextCommandBold:
case TextCommandNoBold:
case TextCommandSemibold:
case TextCommandNoSemibold:
case TextCommandItalic:
case TextCommandNoItalic:
case TextCommandUnderline:
case TextCommandNoUnderline:
break;
case TextCommandLinkIndex:
if (result->unicode() > 0x7FFF) return from;
++result;
break;
case TextCommandLinkText: {
ushort len = result->unicode();
if (len >= 4096 || !canLink) return from;
result += len + 1;
} break;
case TextCommandSkipBlock:
result += 2;
break;
case TextCommandLangTag:
result += 1;
break;
}
return (result < end && *result == TextCommand) ? (result + 1) : from;
}
class TextParser {
public:
static Qt::LayoutDirection stringDirection(const QString &str, int32 from, int32 to) {
const ushort *p = reinterpret_cast<const ushort*>(str.unicode()) + from;
const ushort *end = p + (to - from);
while (p < end) {
uint ucs4 = *p;
if (QChar::isHighSurrogate(ucs4) && p < end - 1) {
ushort low = p[1];
if (QChar::isLowSurrogate(low)) {
ucs4 = QChar::surrogateToUcs4(ucs4, low);
++p;
}
}
switch (QChar::direction(ucs4)) {
case QChar::DirL:
return Qt::LeftToRight;
case QChar::DirR:
case QChar::DirAL:
return Qt::RightToLeft;
default:
break;
}
++p;
}
return Qt::LayoutDirectionAuto;
}
void blockCreated() {
sumWidth += _t->_blocks.back()->f_width();
if (sumWidth.floor().toInt() > stopAfterWidth) {
sumFinished = true;
}
}
void createBlock(int32 skipBack = 0) {
if (lnkIndex < 0x8000 && lnkIndex > maxLnkIndex) maxLnkIndex = lnkIndex;
int32 len = int32(_t->_text.size()) + skipBack - blockStart;
if (len > 0) {
bool newline = !emoji && (len == 1 && _t->_text.at(blockStart) == QChar::LineFeed);
if (newlineAwaited) {
newlineAwaited = false;
if (!newline) {
_t->_text.insert(blockStart, QChar::LineFeed);
createBlock(skipBack - len);
}
}
lastSkipped = false;
if (emoji) {
_t->_blocks.push_back(new EmojiBlock(_t->_st->font, _t->_text, blockStart, len, flags, lnkIndex, emoji));
emoji = 0;
lastSkipped = true;
} else if (newline) {
_t->_blocks.push_back(new NewlineBlock(_t->_st->font, _t->_text, blockStart, len));
} else {
_t->_blocks.push_back(new TextBlock(_t->_st->font, _t->_text, _t->_minResizeWidth, blockStart, len, flags, lnkIndex));
}
blockStart += len;
blockCreated();
}
}
void createSkipBlock(int32 w, int32 h) {
createBlock();
_t->_text.push_back('_');
_t->_blocks.push_back(new SkipBlock(_t->_st->font, _t->_text, blockStart++, w, h, lnkIndex));
blockCreated();
}
void createNewlineBlock() {
createBlock();
_t->_text.push_back(QChar::LineFeed);
createBlock();
}
bool checkCommand() {
bool result = false;
for (QChar c = ((ptr < end) ? *ptr : 0); c == TextCommand; c = ((ptr < end) ? *ptr : 0)) {
if (!readCommand()) {
break;
}
result = true;
}
return result;
}
// Returns true if at least one entity was parsed in the current position.
bool checkEntities() {
while (!removeFlags.isEmpty() && (ptr >= removeFlags.firstKey() || ptr >= end)) {
const QList<int32> &removing(removeFlags.first());
for (int32 i = removing.size(); i > 0;) {
int32 flag = removing.at(--i);
if (flags & flag) {
createBlock();
flags &= ~flag;
if (flag == TextBlockFPre) {
newlineAwaited = true;
}
}
}
removeFlags.erase(removeFlags.begin());
}
while (waitingEntity != entitiesEnd && start + waitingEntity->offset() + waitingEntity->length() <= ptr) {
++waitingEntity;
}
if (waitingEntity == entitiesEnd || ptr < start + waitingEntity->offset()) {
return false;
}
int32 startFlags = 0;
QString linkData, linkText;
auto type = waitingEntity->type(), linkType = EntityInTextInvalid;
LinkDisplayStatus linkDisplayStatus = LinkDisplayedFull;
if (type == EntityInTextBold) {
startFlags = TextBlockFSemibold;
} else if (type == EntityInTextItalic) {
startFlags = TextBlockFItalic;
} else if (type == EntityInTextCode) {
startFlags = TextBlockFCode;
} else if (type == EntityInTextPre) {
startFlags = TextBlockFPre;
createBlock();
if (!_t->_blocks.isEmpty() && _t->_blocks.back()->type() != TextBlockTNewline) {
createNewlineBlock();
}
} else if (type == EntityInTextUrl
|| type == EntityInTextEmail
|| type == EntityInTextMention
|| type == EntityInTextHashtag
|| type == EntityInTextBotCommand) {
linkType = type;
linkData = QString(start + waitingEntity->offset(), waitingEntity->length());
if (linkType == EntityInTextUrl) {
computeLinkText(linkData, &linkText, &linkDisplayStatus);
} else {
linkText = linkData;
}
} else if (type == EntityInTextCustomUrl || type == EntityInTextMentionName) {
linkType = type;
linkData = waitingEntity->data();
linkText = QString(start + waitingEntity->offset(), waitingEntity->length());
}
if (linkType != EntityInTextInvalid) {
createBlock();
links.push_back(TextLinkData(linkType, linkText, linkData, linkDisplayStatus));
lnkIndex = 0x8000 + links.size();
for (auto entityEnd = start + waitingEntity->offset() + waitingEntity->length(); ptr < entityEnd; ++ptr) {
parseCurrentChar();
parseEmojiFromCurrent();
if (sumFinished || _t->_text.size() >= 0x8000) break; // 32k max
}
createBlock();
lnkIndex = 0;
} else if (startFlags) {
if (!(flags & startFlags)) {
createBlock();
flags |= startFlags;
removeFlags[start + waitingEntity->offset() + waitingEntity->length()].push_front(startFlags);
}
}
++waitingEntity;
if (links.size() >= 0x7FFF) {
while (waitingEntity != entitiesEnd && (
waitingEntity->type() == EntityInTextUrl ||
waitingEntity->type() == EntityInTextCustomUrl ||
waitingEntity->type() == EntityInTextEmail ||
waitingEntity->type() == EntityInTextHashtag ||
waitingEntity->type() == EntityInTextMention ||
waitingEntity->type() == EntityInTextMentionName ||
waitingEntity->type() == EntityInTextBotCommand ||
waitingEntity->length() <= 0)) {
++waitingEntity;
}
} else {
while (waitingEntity != entitiesEnd && waitingEntity->length() <= 0) ++waitingEntity;
}
return true;
}
bool readSkipBlockCommand() {
const QChar *afterCmd = textSkipCommand(ptr, end, links.size() < 0x7FFF);
if (afterCmd == ptr) {
return false;
}
ushort cmd = (++ptr)->unicode();
++ptr;
switch (cmd) {
case TextCommandSkipBlock:
createSkipBlock(ptr->unicode(), (ptr + 1)->unicode());
break;
}
ptr = afterCmd;
return true;
}
bool readCommand() {
const QChar *afterCmd = textSkipCommand(ptr, end, links.size() < 0x7FFF);
if (afterCmd == ptr) {
return false;
}
ushort cmd = (++ptr)->unicode();
++ptr;
switch (cmd) {
case TextCommandBold:
if (!(flags & TextBlockFBold)) {
createBlock();
flags |= TextBlockFBold;
}
break;
case TextCommandNoBold:
if (flags & TextBlockFBold) {
createBlock();
flags &= ~TextBlockFBold;
}
break;
case TextCommandSemibold:
if (!(flags & TextBlockFSemibold)) {
createBlock();
flags |= TextBlockFSemibold;
}
break;
case TextCommandNoSemibold:
if (flags & TextBlockFSemibold) {
createBlock();
flags &= ~TextBlockFSemibold;
}
break;
case TextCommandItalic:
if (!(flags & TextBlockFItalic)) {
createBlock();
flags |= TextBlockFItalic;
}
break;
case TextCommandNoItalic:
if (flags & TextBlockFItalic) {
createBlock();
flags &= ~TextBlockFItalic;
}
break;
case TextCommandUnderline:
if (!(flags & TextBlockFUnderline)) {
createBlock();
flags |= TextBlockFUnderline;
}
break;
case TextCommandNoUnderline:
if (flags & TextBlockFUnderline) {
createBlock();
flags &= ~TextBlockFUnderline;
}
break;
case TextCommandLinkIndex:
if (ptr->unicode() != lnkIndex) {
createBlock();
lnkIndex = ptr->unicode();
}
break;
case TextCommandLinkText: {
createBlock();
int32 len = ptr->unicode();
links.push_back(TextLinkData(EntityInTextCustomUrl, QString(), QString(++ptr, len), LinkDisplayedFull));
lnkIndex = 0x8000 + links.size();
} break;
case TextCommandSkipBlock:
createSkipBlock(ptr->unicode(), (ptr + 1)->unicode());
break;
}
ptr = afterCmd;
return true;
}
void parseCurrentChar() {
int skipBack = 0;
ch = ((ptr < end) ? *ptr : 0);
emojiLookback = 0;
bool skip = false, isNewLine = multiline && chIsNewline(ch), isSpace = chIsSpace(ch), isDiac = chIsDiac(ch), isTilde = checkTilde && (ch == '~');
if (chIsBad(ch) || ch.isLowSurrogate()) {
skip = true;
} else if (ch == 0xFE0F && (cPlatform() == dbipMac || cPlatform() == dbipMacOld)) {
// Some sequences like 0x0E53 0xFE0F crash OS X harfbuzz text processing :(
skip = true;
} else if (isDiac) {
if (lastSkipped || emoji || ++diacs > chMaxDiacAfterSymbol()) {
skip = true;
}
} else if (ch.isHighSurrogate()) {
if (ptr + 1 >= end || !(ptr + 1)->isLowSurrogate()) {
skip = true;
} else {
_t->_text.push_back(ch);
skipBack = -1;
++ptr;
ch = *ptr;
emojiLookback = 1;
}
}
lastSkipped = skip;
if (skip) {
ch = 0;
} else {
if (isTilde) { // tilde fix in OpenSans
if (!(flags & TextBlockFTilde)) {
createBlock(skipBack);
flags |= TextBlockFTilde;
}
} else {
if (flags & TextBlockFTilde) {
createBlock(skipBack);
flags &= ~TextBlockFTilde;
}
}
if (isNewLine) {
createNewlineBlock();
} else if (isSpace) {
_t->_text.push_back(QChar::Space);
} else {
if (emoji) createBlock(skipBack);
_t->_text.push_back(ch);
}
if (!isDiac) diacs = 0;
}
}
void parseEmojiFromCurrent() {
int len = 0;
auto e = Ui::Emoji::Find(ptr - emojiLookback, end, &len);
if (!e) return;
for (int l = len - emojiLookback - 1; l > 0; --l) {
_t->_text.push_back(*++ptr);
}
if (e->hasPostfix() && _t->_text.at(_t->_text.size() - 1).unicode() != Ui::Emoji::kPostfix) {
_t->_text.push_back(QChar(Ui::Emoji::kPostfix));
++len;
}
createBlock(-len);
emoji = e;
}
TextParser(Text *t, const QString &text, const TextParseOptions &options) : _t(t),
src(text),
rich(options.flags & TextParseRichText),
multiline(options.flags & TextParseMultiline),
stopAfterWidth(QFIXED_MAX) {
if (options.flags & TextParseLinks) {
textParseEntities(src, options.flags, &entities, rich);
}
parse(options);
}
TextParser(Text *t, const TextWithEntities &textWithEntities, const TextParseOptions &options) : _t(t),
src(textWithEntities.text),
rich(options.flags & TextParseRichText),
multiline(options.flags & TextParseMultiline),
stopAfterWidth(QFIXED_MAX) {
auto preparsed = textWithEntities.entities;
if ((options.flags & TextParseLinks) && !preparsed.isEmpty()) {
bool parseMentions = (options.flags & TextParseMentions);
bool parseHashtags = (options.flags & TextParseHashtags);
bool parseBotCommands = (options.flags & TextParseBotCommands);
bool parseMono = (options.flags & TextParseMono);
if (parseMentions && parseHashtags && parseBotCommands && parseMono) {
entities = preparsed;
} else {
int32 i = 0, l = preparsed.size();
entities.reserve(l);
const QChar s = src.size();
for (; i < l; ++i) {
auto type = preparsed.at(i).type();
if (((type == EntityInTextMention || type == EntityInTextMentionName) && !parseMentions) ||
(type == EntityInTextHashtag && !parseHashtags) ||
(type == EntityInTextBotCommand && !parseBotCommands) ||
((type == EntityInTextBold || type == EntityInTextItalic || type == EntityInTextCode || type == EntityInTextPre) && !parseMono)) {
continue;
}
entities.push_back(preparsed.at(i));
}
}
}
parse(options);
}
void parse(const TextParseOptions &options) {
if (options.maxw > 0 && options.maxh > 0) {
stopAfterWidth = ((options.maxh / _t->_st->font->height) + 1) * options.maxw;
}
start = src.constData();
end = start + src.size();
entitiesEnd = entities.cend();
waitingEntity = entities.cbegin();
while (waitingEntity != entitiesEnd && waitingEntity->length() <= 0) ++waitingEntity;
int firstMonospaceOffset = EntityInText::firstMonospaceOffset(entities, end - start);
ptr = start;
while (ptr != end && chIsTrimmed(*ptr, rich) && ptr != start + firstMonospaceOffset) {
++ptr;
}
while (ptr != end && chIsTrimmed(*(end - 1), rich)) {
--end;
}
_t->_text.resize(0);
_t->_text.reserve(end - ptr);
diacs = 0;
sumWidth = 0;
sumFinished = newlineAwaited = false;
blockStart = 0;
emoji = 0;
ch = emojiLookback = 0;
lastSkipped = false;
checkTilde = !cRetina() && (_t->_st->font->size() == 13) && (_t->_st->font->flags() == 0) && (_t->_st->font->f.family() == qstr("Open Sans")); // tilde Open Sans fix
for (; ptr <= end; ++ptr) {
while (checkEntities() || (rich && checkCommand())) {
}
parseCurrentChar();
parseEmojiFromCurrent();
if (sumFinished || _t->_text.size() >= 0x8000) break; // 32k max
}
createBlock();
if (sumFinished && rich) { // we could've skipped the final skip block command
for (; ptr < end; ++ptr) {
if (*ptr == TextCommand && readSkipBlockCommand()) {
break;
}
}
}
removeFlags.clear();
_t->_links.resize(maxLnkIndex);
for (Text::TextBlocks::const_iterator i = _t->_blocks.cbegin(), e = _t->_blocks.cend(); i != e; ++i) {
ITextBlock *b = *i;
if (b->lnkIndex() > 0x8000) {
lnkIndex = maxLnkIndex + (b->lnkIndex() - 0x8000);
if (_t->_links.size() < lnkIndex) {
_t->_links.resize(lnkIndex);
const TextLinkData &link(links[lnkIndex - maxLnkIndex - 1]);
ClickHandlerPtr handler;
switch (link.type) {
case EntityInTextCustomUrl: handler.reset(new HiddenUrlClickHandler(link.data)); break;
case EntityInTextEmail:
case EntityInTextUrl: handler.reset(new UrlClickHandler(link.data, link.displayStatus == LinkDisplayedFull)); break;
case EntityInTextBotCommand: handler.reset(new BotCommandClickHandler(link.data)); break;
case EntityInTextHashtag:
if (options.flags & TextTwitterMentions) {
handler.reset(new UrlClickHandler(qsl("https://twitter.com/hashtag/") + link.data.mid(1) + qsl("?src=hash"), true));
} else if (options.flags & TextInstagramMentions) {
handler.reset(new UrlClickHandler(qsl("https://instagram.com/explore/tags/") + link.data.mid(1) + '/', true));
} else {
handler.reset(new HashtagClickHandler(link.data));
}
break;
case EntityInTextMention:
if (options.flags & TextTwitterMentions) {
handler.reset(new UrlClickHandler(qsl("https://twitter.com/") + link.data.mid(1), true));
} else if (options.flags & TextInstagramMentions) {
handler.reset(new UrlClickHandler(qsl("https://instagram.com/") + link.data.mid(1) + '/', true));
} else {
handler.reset(new MentionClickHandler(link.data));
}
break;
case EntityInTextMentionName: {
UserId userId = 0;
uint64 accessHash = 0;
if (mentionNameToFields(link.data, &userId, &accessHash)) {
handler.reset(new MentionNameClickHandler(link.text, userId, accessHash));
} else {
LOG(("Bad mention name: %1").arg(link.data));
}
} break;
}
t_assert(!handler.isNull());
_t->setLink(lnkIndex, handler);
}
b->setLnkIndex(lnkIndex);
}
}
_t->_links.squeeze();
_t->_blocks.squeeze();
_t->_text.squeeze();
}
private:
enum LinkDisplayStatus {
LinkDisplayedFull,
LinkDisplayedElided,
};
struct TextLinkData {
TextLinkData() = default;
TextLinkData(EntityInTextType type, const QString &text, const QString &data, LinkDisplayStatus displayStatus)
: type(type)
, text(text)
, data(data)
, displayStatus(displayStatus) {
}
EntityInTextType type = EntityInTextInvalid;
QString text, data;
LinkDisplayStatus displayStatus = LinkDisplayedFull;
};
void computeLinkText(const QString &linkData, QString *outLinkText, LinkDisplayStatus *outDisplayStatus) {
QUrl url(linkData), good(url.isValid() ? url.toEncoded() : "");
QString readable = good.isValid() ? good.toDisplayString() : linkData;
*outLinkText = _t->_st->font->elided(readable, st::linkCropLimit);
*outDisplayStatus = (*outLinkText == readable) ? LinkDisplayedFull : LinkDisplayedElided;
}
Text *_t;
QString src;
const QChar *start, *end, *ptr;
bool rich, multiline;
EntitiesInText entities;
EntitiesInText::const_iterator waitingEntity, entitiesEnd;
typedef QVector<TextLinkData> TextLinks;
TextLinks links;
typedef QMap<const QChar*, QList<int32> > RemoveFlagsMap;
RemoveFlagsMap removeFlags;
uint16 maxLnkIndex = 0;
// current state
int32 flags = 0;
uint16 lnkIndex = 0;
EmojiPtr emoji = nullptr; // current emoji, if current word is an emoji, or zero
int32 blockStart = 0; // offset in result, from which current parsed block is started
int32 diacs = 0; // diac chars skipped without good char
QFixed sumWidth, stopAfterWidth; // summary width of all added words
bool sumFinished = false;
bool newlineAwaited = false;
// current char data
QChar ch; // current char (low surrogate, if current char is surrogate pair)
int32 emojiLookback; // how far behind the current ptr to look for current emoji
bool lastSkipped; // did we skip current char
bool checkTilde; // do we need a special text block for tilde symbol
};
namespace {
// COPIED FROM qtextengine.cpp AND MODIFIED
struct BidiStatus {
BidiStatus() {
eor = QChar::DirON;
lastStrong = QChar::DirON;
last = QChar:: DirON;
dir = QChar::DirON;
}
QChar::Direction eor;
QChar::Direction lastStrong;
QChar::Direction last;
QChar::Direction dir;
};
enum { _MaxBidiLevel = 61 };
enum { _MaxItemLength = 4096 };
struct BidiControl {
inline BidiControl(bool rtl)
: cCtx(0), base(rtl ? 1 : 0), level(rtl ? 1 : 0), override(false) {}
inline void embed(bool rtl, bool o = false) {
unsigned int toAdd = 1;
if((level%2 != 0) == rtl ) {
++toAdd;
}
if (level + toAdd <= _MaxBidiLevel) {
ctx[cCtx].level = level;
ctx[cCtx].override = override;
cCtx++;
override = o;
level += toAdd;
}
}
inline bool canPop() const { return cCtx != 0; }
inline void pdf() {
Q_ASSERT(cCtx);
--cCtx;
level = ctx[cCtx].level;
override = ctx[cCtx].override;
}
inline QChar::Direction basicDirection() const {
return (base ? QChar::DirR : QChar:: DirL);
}
inline unsigned int baseLevel() const {
return base;
}
inline QChar::Direction direction() const {
return ((level%2) ? QChar::DirR : QChar:: DirL);
}
struct {
unsigned int level;
bool override;
} ctx[_MaxBidiLevel];
unsigned int cCtx;
const unsigned int base;
unsigned int level;
bool override;
};
static void eAppendItems(QScriptAnalysis *analysis, int &start, int &stop, const BidiControl &control, QChar::Direction dir) {
if (start > stop)
return;
int level = control.level;
if(dir != QChar::DirON && !control.override) {
// add level of run (cases I1 & I2)
if(level % 2) {
if(dir == QChar::DirL || dir == QChar::DirAN || dir == QChar::DirEN)
level++;
} else {
if(dir == QChar::DirR)
level++;
else if(dir == QChar::DirAN || dir == QChar::DirEN)
level += 2;
}
}
QScriptAnalysis *s = analysis + start;
const QScriptAnalysis *e = analysis + stop;
while (s <= e) {
s->bidiLevel = level;
++s;
}
++stop;
start = stop;
}
} // namespace
class TextPainter {
public:
TextPainter(Painter *p, const Text *t) : _p(p), _t(t) {
}
~TextPainter() {
restoreAfterElided();
if (_p) {
_p->setPen(_originalPen);
}
}
void draw(int32 left, int32 top, int32 w, style::align align, int32 yFrom, int32 yTo, TextSelection selection = { 0, 0 }, bool fullWidthSelection = true) {
if (_t->isEmpty()) return;
_blocksSize = _t->_blocks.size();
if (_p) {
_p->setFont(_t->_st->font);
_textPalette = &_p->textPalette();
_originalPen = _p->pen();
_originalPenSelected = (_textPalette->selectFg->c.alphaF() == 0) ? _originalPen : _textPalette->selectFg->p;
}
_x = left;
_y = top;
_yFrom = yFrom + top;
_yTo = (yTo < 0) ? -1 : (yTo + top);
_selection = selection;
_fullWidthSelection = fullWidthSelection;
_wLeft = _w = w;
if (_elideLast) {
_yToElide = _yTo;
if (_elideRemoveFromEnd > 0 && !_t->_blocks.isEmpty()) {
int firstBlockHeight = countBlockHeight(_t->_blocks.front(), _t->_st);
if (_y + firstBlockHeight >= _yToElide) {
_wLeft -= _elideRemoveFromEnd;
}
}
}
_str = _t->_text.unicode();
if (_p) {
auto clip = _p->hasClipping() ? _p->clipBoundingRect() : QRect();
if (clip.width() > 0 || clip.height() > 0) {
if (_yFrom < clip.y()) _yFrom = clip.y();
if (_yTo < 0 || _yTo > clip.y() + clip.height()) _yTo = clip.y() + clip.height();
}
}
_align = align;
_parDirection = _t->_startDir;
if (_parDirection == Qt::LayoutDirectionAuto) _parDirection = cLangDir();
if ((*_t->_blocks.cbegin())->type() != TextBlockTNewline) {
initNextParagraph(_t->_blocks.cbegin());
}
_lineStart = 0;
_lineStartBlock = 0;
_lineHeight = 0;
_fontHeight = _t->_st->font->height;
auto last_rBearing = QFixed(0);
_last_rPadding = QFixed(0);
auto blockIndex = 0;
bool longWordLine = true;
auto e = _t->_blocks.cend();
for (auto i = _t->_blocks.cbegin(); i != e; ++i, ++blockIndex) {
auto b = *i;
auto _btype = b->type();
auto blockHeight = countBlockHeight(b, _t->_st);
if (_btype == TextBlockTNewline) {
if (!_lineHeight) _lineHeight = blockHeight;
if (!drawLine((*i)->from(), i, e)) {
return;
}
_y += _lineHeight;
_lineHeight = 0;
_lineStart = _t->countBlockEnd(i, e);
_lineStartBlock = blockIndex + 1;
last_rBearing = b->f_rbearing();
_last_rPadding = b->f_rpadding();
_wLeft = _w - (b->f_width() - last_rBearing);
if (_elideLast && _elideRemoveFromEnd > 0 && (_y + blockHeight >= _yToElide)) {
_wLeft -= _elideRemoveFromEnd;
}
_parDirection = static_cast<NewlineBlock*>(b)->nextDirection();
if (_parDirection == Qt::LayoutDirectionAuto) _parDirection = cLangDir();
initNextParagraph(i + 1);
longWordLine = true;
continue;
}
auto b__f_rbearing = b->f_rbearing();
auto newWidthLeft = _wLeft - last_rBearing - (_last_rPadding + b->f_width() - b__f_rbearing);
if (newWidthLeft >= 0) {
last_rBearing = b__f_rbearing;
_last_rPadding = b->f_rpadding();
_wLeft = newWidthLeft;
_lineHeight = qMax(_lineHeight, blockHeight);
longWordLine = false;
continue;
}
if (_btype == TextBlockTText) {
auto t = static_cast<TextBlock*>(b);
if (t->_words.isEmpty()) { // no words in this block, spaces only => layout this block in the same line
_last_rPadding += b->f_rpadding();
_lineHeight = qMax(_lineHeight, blockHeight);
longWordLine = false;
continue;
}
auto f_wLeft = _wLeft; // vars for saving state of the last word start
auto f_lineHeight = _lineHeight; // f points to the last word-start element of t->_words
for (auto j = t->_words.cbegin(), en = t->_words.cend(), f = j; j != en; ++j) {
auto wordEndsHere = (j->f_width() >= 0);
auto j_width = wordEndsHere ? j->f_width() : -j->f_width();
auto newWidthLeft = _wLeft - last_rBearing - (_last_rPadding + j_width - j->f_rbearing());
if (newWidthLeft >= 0) {
last_rBearing = j->f_rbearing();
_last_rPadding = j->f_rpadding();
_wLeft = newWidthLeft;
_lineHeight = qMax(_lineHeight, blockHeight);
if (wordEndsHere) {
longWordLine = false;
}
if (wordEndsHere || longWordLine) {
f = j + 1;
f_wLeft = _wLeft;
f_lineHeight = _lineHeight;
}
continue;
}
auto elidedLineHeight = qMax(_lineHeight, blockHeight);
auto elidedLine = _elideLast && (_y + elidedLineHeight >= _yToElide);
if (elidedLine) {
_lineHeight = elidedLineHeight;
} else if (f != j && !_breakEverywhere) {
// word did not fit completely, so we roll back the state to the beginning of this long word
j = f;
_wLeft = f_wLeft;
_lineHeight = f_lineHeight;
j_width = (j->f_width() >= 0) ? j->f_width() : -j->f_width();
}
if (!drawLine(elidedLine ? ((j + 1 == en) ? _t->countBlockEnd(i, e) : (j + 1)->from()) : j->from(), i, e)) {
return;
}
_y += _lineHeight;
_lineHeight = qMax(0, blockHeight);
_lineStart = j->from();
_lineStartBlock = blockIndex;
last_rBearing = j->f_rbearing();
_last_rPadding = j->f_rpadding();
_wLeft = _w - (j_width - last_rBearing);
if (_elideLast && _elideRemoveFromEnd > 0 && (_y + blockHeight >= _yToElide)) {
_wLeft -= _elideRemoveFromEnd;
}
longWordLine = true;
f = j + 1;
f_wLeft = _wLeft;
f_lineHeight = _lineHeight;
}
continue;
}
auto elidedLineHeight = qMax(_lineHeight, blockHeight);
auto elidedLine = _elideLast && (_y + elidedLineHeight >= _yToElide);
if (elidedLine) {
_lineHeight = elidedLineHeight;
}
if (!drawLine(elidedLine ? _t->countBlockEnd(i, e) : b->from(), i, e)) {
return;
}
_y += _lineHeight;
_lineHeight = qMax(0, blockHeight);
_lineStart = b->from();
_lineStartBlock = blockIndex;
last_rBearing = b__f_rbearing;
_last_rPadding = b->f_rpadding();
_wLeft = _w - (b->f_width() - last_rBearing);
if (_elideLast && _elideRemoveFromEnd > 0 && (_y + blockHeight >= _yToElide)) {
_wLeft -= _elideRemoveFromEnd;
}
longWordLine = true;
continue;