diff options
Diffstat (limited to 'src/gui/text/qtextlayout.cpp')
| -rw-r--r-- | src/gui/text/qtextlayout.cpp | 394 |
1 files changed, 138 insertions, 256 deletions
diff --git a/src/gui/text/qtextlayout.cpp b/src/gui/text/qtextlayout.cpp index 93f71d3..bd224c6 100644 --- a/src/gui/text/qtextlayout.cpp +++ b/src/gui/text/qtextlayout.cpp @@ -72,23 +72,6 @@ QT_BEGIN_NAMESPACE #define SuppressText 0x5012 #define SuppressBackground 0x513 -static QFixed alignLine(QTextEngine *eng, const QScriptLine &line) -{ - QFixed x = 0; - eng->justify(line); - // if width is QFIXED_MAX that means we used setNumColumns() and that implicitly makes this line left aligned. - if (!line.justified && line.width != QFIXED_MAX) { - int align = eng->option.alignment(); - if (align & Qt::AlignJustify && eng->isRightToLeft()) - align = Qt::AlignRight; - if (align & Qt::AlignRight) - x = line.width - (line.textAdvance + eng->leadingSpaceWidth(line)); - else if (align & Qt::AlignHCenter) - x = (line.width - line.textAdvance)/2; - } - return x; -} - /*! \class QTextLayout::FormatRange \reentrant @@ -596,6 +579,30 @@ bool QTextLayout::cacheEnabled() const } /*! + Set the visual cursor movement style. If the QTextLayout is backed by + a document, you can ignore this and use the option in QTextDocument, + this option is for widgets like QLineEdit or custom widgets without + a QTextDocument. Default value is QTextCursor::Logical. + + \sa setCursorMoveStyle() +*/ +void QTextLayout::setCursorMoveStyle(QTextCursor::MoveStyle style) +{ + d->visualMovement = style == QTextCursor::Visual ? true : false; +} + +/*! + The cursor movement style of this QTextLayout. The default is + QTextCursor::Logical. + + \sa setCursorMoveStyle() +*/ +QTextCursor::MoveStyle QTextLayout::cursorMoveStyle() const +{ + return d->visualMovement ? QTextCursor::Visual : QTextCursor::Logical; +} + +/*! Begins the layout process. \sa endLayout() @@ -718,6 +725,34 @@ int QTextLayout::previousCursorPosition(int oldPos, CursorMode mode) const } /*! + Returns the cursor position to the right of \a oldPos, next to it. + It's dependent on the visual position of characters, after bi-directional + reordering. + + \sa leftCursorPosition(), nextCursorPosition() +*/ +int QTextLayout::rightCursorPosition(int oldPos) const +{ + int newPos = d->positionAfterVisualMovement(oldPos, QTextCursor::Right); +// qDebug("%d -> %d", oldPos, newPos); + return newPos; +} + +/*! + Returns the cursor position to the left of \a oldPos, next to it. + It's dependent on the visual position of characters, after bi-directional + reordering. + + \sa rightCursorPosition(), previousCursorPosition() +*/ +int QTextLayout::leftCursorPosition(int oldPos) const +{ + int newPos = d->positionAfterVisualMovement(oldPos, QTextCursor::Left); +// qDebug("%d -> %d", oldPos, newPos); + return newPos; +} + +/*!/ Returns true if position \a pos is a valid cursor position. In a Unicode context some positions in the text are not valid @@ -815,16 +850,8 @@ QTextLine QTextLayout::lineAt(int i) const */ QTextLine QTextLayout::lineForTextPosition(int pos) const { - for (int i = 0; i < d->lines.size(); ++i) { - const QScriptLine& line = d->lines[i]; - if (line.from + (int)line.length > pos) - return QTextLine(i, d); - } - if (!d->layoutData) - d->itemize(); - if (pos == d->layoutData->string.length() && d->lines.size()) - return QTextLine(d->lines.size()-1, d); - return QTextLine(); + int lineNum = d->lineNumberForTextPosition(pos); + return lineNum >= 0 ? lineAt(lineNum) : QTextLine(); } /*! @@ -919,201 +946,6 @@ void QTextLayout::setFlags(int flags) } } -struct QTextLineItemIterator -{ - QTextLineItemIterator(QTextEngine *eng, int lineNum, const QPointF &pos = QPointF(), - const QTextLayout::FormatRange *_selection = 0); - - inline bool atEnd() const { return logicalItem >= nItems - 1; } - QScriptItem &next(); - - bool getSelectionBounds(QFixed *selectionX, QFixed *selectionWidth) const; - inline bool isOutsideSelection() const { - QFixed tmp1, tmp2; - return !getSelectionBounds(&tmp1, &tmp2); - } - - QTextEngine *eng; - - QFixed x; - QFixed pos_x; - const QScriptLine &line; - QScriptItem *si; - - int lineEnd; - int firstItem; - int lastItem; - int nItems; - int logicalItem; - int item; - int itemLength; - - int glyphsStart; - int glyphsEnd; - int itemStart; - int itemEnd; - - QFixed itemWidth; - - QVarLengthArray<int> visualOrder; - QVarLengthArray<uchar> levels; - - const QTextLayout::FormatRange *selection; -}; - -QTextLineItemIterator::QTextLineItemIterator(QTextEngine *_eng, int lineNum, const QPointF &pos, - const QTextLayout::FormatRange *_selection) - : eng(_eng), - line(eng->lines[lineNum]), - si(0), - lineEnd(line.from + line.length), - firstItem(eng->findItem(line.from)), - lastItem(eng->findItem(lineEnd - 1)), - nItems((firstItem >= 0 && lastItem >= firstItem)? (lastItem-firstItem+1) : 0), - logicalItem(-1), - item(-1), - visualOrder(nItems), - levels(nItems), - selection(_selection) -{ - pos_x = x = QFixed::fromReal(pos.x()); - - x += line.x; - - x += alignLine(eng, line); - - for (int i = 0; i < nItems; ++i) - levels[i] = eng->layoutData->items[i+firstItem].analysis.bidiLevel; - QTextEngine::bidiReorder(nItems, levels.data(), visualOrder.data()); - - eng->shapeLine(line); -} - -QScriptItem &QTextLineItemIterator::next() -{ - x += itemWidth; - - ++logicalItem; - item = visualOrder[logicalItem] + firstItem; - itemLength = eng->length(item); - si = &eng->layoutData->items[item]; - if (!si->num_glyphs) - eng->shape(item); - - if (si->analysis.flags >= QScriptAnalysis::TabOrObject) { - itemWidth = si->width; - return *si; - } - - unsigned short *logClusters = eng->logClusters(si); - QGlyphLayout glyphs = eng->shapedGlyphs(si); - - itemStart = qMax(line.from, si->position); - glyphsStart = logClusters[itemStart - si->position]; - if (lineEnd < si->position + itemLength) { - itemEnd = lineEnd; - glyphsEnd = logClusters[itemEnd-si->position]; - } else { - itemEnd = si->position + itemLength; - glyphsEnd = si->num_glyphs; - } - // show soft-hyphen at line-break - if (si->position + itemLength >= lineEnd - && eng->layoutData->string.at(lineEnd - 1) == 0x00ad) - glyphs.attributes[glyphsEnd - 1].dontPrint = false; - - itemWidth = 0; - for (int g = glyphsStart; g < glyphsEnd; ++g) - itemWidth += glyphs.effectiveAdvance(g); - - return *si; -} - -static QFixed offsetInLigature(const unsigned short *logClusters, - const QGlyphLayout &glyphs, - int pos, int max, int glyph_pos) -{ - int offsetInCluster = 0; - for (int i = pos - 1; i >= 0; i--) { - if (logClusters[i] == glyph_pos) - offsetInCluster++; - else - break; - } - - // in the case that the offset is inside a (multi-character) glyph, - // interpolate the position. - if (offsetInCluster > 0) { - int clusterLength = 0; - for (int i = pos - offsetInCluster; i < max; i++) { - if (logClusters[i] == glyph_pos) - clusterLength++; - else - break; - } - if (clusterLength) - return glyphs.advances_x[glyph_pos] * offsetInCluster / clusterLength; - } - - return 0; -} - -bool QTextLineItemIterator::getSelectionBounds(QFixed *selectionX, QFixed *selectionWidth) const -{ - *selectionX = *selectionWidth = 0; - - if (!selection) - return false; - - if (si->analysis.flags >= QScriptAnalysis::TabOrObject) { - if (si->position >= selection->start + selection->length - || si->position + itemLength <= selection->start) - return false; - - *selectionX = x; - *selectionWidth = itemWidth; - } else { - unsigned short *logClusters = eng->logClusters(si); - QGlyphLayout glyphs = eng->shapedGlyphs(si); - - int from = qMax(itemStart, selection->start) - si->position; - int to = qMin(itemEnd, selection->start + selection->length) - si->position; - if (from >= to) - return false; - - int start_glyph = logClusters[from]; - int end_glyph = (to == eng->length(item)) ? si->num_glyphs : logClusters[to]; - QFixed soff; - QFixed swidth; - if (si->analysis.bidiLevel %2) { - for (int g = glyphsEnd - 1; g >= end_glyph; --g) - soff += glyphs.effectiveAdvance(g); - for (int g = end_glyph - 1; g >= start_glyph; --g) - swidth += glyphs.effectiveAdvance(g); - } else { - for (int g = glyphsStart; g < start_glyph; ++g) - soff += glyphs.effectiveAdvance(g); - for (int g = start_glyph; g < end_glyph; ++g) - swidth += glyphs.effectiveAdvance(g); - } - - // If the starting character is in the middle of a ligature, - // selection should only contain the right part of that ligature - // glyph, so we need to get the width of the left part here and - // add it to *selectionX - QFixed leftOffsetInLigature = offsetInLigature(logClusters, glyphs, from, - to, start_glyph); - *selectionX = x + soff + leftOffsetInLigature; - *selectionWidth = swidth - leftOffsetInLigature; - // If the ending character is also part of a ligature, swidth does - // not contain that part yet, we also need to find out the width of - // that left part - *selectionWidth += offsetInLigature(logClusters, glyphs, to, - eng->length(item), end_glyph); - } - return true; -} - static void addSelectedRegionsToPath(QTextEngine *eng, int lineNumber, const QPointF &pos, QTextLayout::FormatRange *selection, QPainterPath *region, QRectF boundingRect) { @@ -1382,18 +1214,9 @@ void QTextLayout::drawCursor(QPainter *p, const QPointF &pos, int cursorPosition QFixed pos_y = QFixed::fromReal(position.y()); cursorPosition = qBound(0, cursorPosition, d->layoutData->string.length()); - int line = 0; - if (cursorPosition == d->layoutData->string.length()) { - line = d->lines.size() - 1; - } else { - // ### binary search - for (line = 0; line < d->lines.size(); line++) { - const QScriptLine &sl = d->lines[line]; - if (sl.from <= cursorPosition && sl.from + (int)sl.length > cursorPosition) - break; - } - } - + int line = d->lineNumberForTextPosition(cursorPosition); + if (line < 0) + line = 0; if (line >= d->lines.size()) return; @@ -1402,7 +1225,15 @@ void QTextLayout::drawCursor(QPainter *p, const QPointF &pos, int cursorPosition qreal x = position.x() + l.cursorToX(cursorPosition); - int itm = d->findItem(cursorPosition - 1); + int itm; + + if (d->visualCursorMovement()) { + if (cursorPosition == sl.from + sl.length) + cursorPosition--; + itm = d->findItem(cursorPosition); + } else + itm = d->findItem(cursorPosition - 1); + QFixed base = sl.base(); QFixed descent = sl.descent; bool rightToLeft = d->isRightToLeft(); @@ -1512,7 +1343,7 @@ QRectF QTextLine::rect() const QRectF QTextLine::naturalTextRect() const { const QScriptLine& sl = eng->lines[i]; - QFixed x = sl.x + alignLine(eng, sl); + QFixed x = sl.x + eng->alignLine(sl); QFixed width = sl.textWidth; if (sl.justified) @@ -2632,9 +2463,10 @@ qreal QTextLine::cursorToX(int *cursorPos, Edge edge) const eng->itemize(); const QScriptLine &line = eng->lines[i]; + bool lastLine = i >= eng->lines.size() - 1; QFixed x = line.x; - x += alignLine(eng, line); + x += eng->alignLine(line); if (!i && !eng->layoutData->items.size()) { *cursorPos = 0; @@ -2720,21 +2552,29 @@ qreal QTextLine::cursorToX(int *cursorPos, Edge edge) const logClusters = eng->logClusters(si); glyphs = eng->shapedGlyphs(si); if (si->analysis.flags >= QScriptAnalysis::TabOrObject) { - if(pos == l) + if (pos == (reverse ? 0 : l)) x += si->width; } else { + bool rtl = eng->isRightToLeft(); + bool visual = eng->visualCursorMovement(); if (reverse) { int end = qMin(lineEnd, si->position + l) - si->position; int glyph_end = end == l ? si->num_glyphs : logClusters[end]; - for (int i = glyph_end - 1; i >= glyph_pos; i--) + int glyph_start = glyph_pos; + if (visual && !rtl && !(lastLine && itm == (visualOrder[nItems - 1] + firstItem))) + glyph_start++; + for (int i = glyph_end - 1; i >= glyph_start; i--) x += glyphs.effectiveAdvance(i); } else { int start = qMax(line.from - si->position, 0); int glyph_start = logClusters[start]; - for (int i = glyph_start; i < glyph_pos; i++) + int glyph_end = glyph_pos; + if (!visual || !rtl || (lastLine && itm == visualOrder[0] + firstItem)) + glyph_end--; + for (int i = glyph_start; i <= glyph_end; i++) x += glyphs.effectiveAdvance(i); } - x += offsetInLigature(logClusters, glyphs, pos, line.length, glyph_pos); + x += eng->offsetInLigature(si, pos, line.length, glyph_pos); } *cursorPos = pos + si->position; @@ -2753,6 +2593,8 @@ int QTextLine::xToCursor(qreal _x, CursorPosition cpos) const { QFixed x = QFixed::fromReal(_x); const QScriptLine &line = eng->lines[i]; + bool lastLine = i >= eng->lines.size() - 1; + int lineNum = i; if (!eng->layoutData) eng->itemize(); @@ -2770,7 +2612,7 @@ int QTextLine::xToCursor(qreal _x, CursorPosition cpos) const return 0; x -= line.x; - x -= alignLine(eng, line); + x -= eng->alignLine(line); // qDebug("xToCursor: x=%f, cpos=%d", x.toReal(), cpos); QVarLengthArray<int> visualOrder(nItems); @@ -2779,6 +2621,7 @@ int QTextLine::xToCursor(qreal _x, CursorPosition cpos) const levels[i] = eng->layoutData->items[i+firstItem].analysis.bidiLevel; QTextEngine::bidiReorder(nItems, levels.data(), visualOrder.data()); + bool visual = eng->visualCursorMovement(); if (x <= 0) { // left of first item int item = visualOrder[0]+firstItem; @@ -2795,8 +2638,13 @@ int QTextLine::xToCursor(qreal _x, CursorPosition cpos) const || (line.justified && x < line.width)) { // has to be in one of the runs QFixed pos; + bool rtl = eng->isRightToLeft(); eng->shapeLine(line); + QVector<int> insertionPoints; + if (visual && rtl) + eng->insertionPointsForLine(lineNum, insertionPoints); + int nchars = 0; for (int i = 0; i < nItems; ++i) { int item = visualOrder[i]+firstItem; QScriptItem &si = eng->layoutData->items[item]; @@ -2826,6 +2674,7 @@ int QTextLine::xToCursor(qreal _x, CursorPosition cpos) const if (pos + item_width < x) { pos += item_width; + nchars += end; continue; } // qDebug(" inside run"); @@ -2870,27 +2719,60 @@ int QTextLine::xToCursor(qreal _x, CursorPosition cpos) const } else { QFixed dist = INT_MAX/256; if (si.analysis.bidiLevel % 2) { - pos += item_width; - while (gs <= ge) { - if (glyphs.attributes[gs].clusterStart && qAbs(x-pos) < dist) { - glyph_pos = gs; - dist = qAbs(x-pos); + if (!visual || rtl || (lastLine && i == nItems - 1)) { + pos += item_width; + while (gs <= ge) { + if (glyphs.attributes[gs].clusterStart && qAbs(x-pos) < dist) { + glyph_pos = gs; + dist = qAbs(x-pos); + } + pos -= glyphs.effectiveAdvance(gs); + ++gs; + } + } else { + while (ge >= gs) { + if (glyphs.attributes[ge].clusterStart && qAbs(x-pos) < dist) { + glyph_pos = ge; + dist = qAbs(x-pos); + } + pos += glyphs.effectiveAdvance(ge); + --ge; } - pos -= glyphs.effectiveAdvance(gs); - ++gs; } } else { - while (gs <= ge) { - if (glyphs.attributes[gs].clusterStart && qAbs(x-pos) < dist) { - glyph_pos = gs; - dist = qAbs(x-pos); + if (!visual || !rtl || (lastLine && i == 0)) { + while (gs <= ge) { + if (glyphs.attributes[gs].clusterStart && qAbs(x-pos) < dist) { + glyph_pos = gs; + dist = qAbs(x-pos); + } + pos += glyphs.effectiveAdvance(gs); + ++gs; } - pos += glyphs.effectiveAdvance(gs); - ++gs; + } else { + QFixed oldPos = pos; + while (gs <= ge) { + pos += glyphs.effectiveAdvance(gs); + if (glyphs.attributes[gs].clusterStart && qAbs(x-pos) < dist) { + glyph_pos = gs; + dist = qAbs(x-pos); + } + ++gs; + } + pos = oldPos; } } - if (qAbs(x-pos) < dist) + if (qAbs(x-pos) < dist) { + if (visual) { + if (!rtl && i < nItems - 1) { + nchars += end; + continue; + } + if (rtl && nchars > 0) + return insertionPoints[lastLine ? nchars : nchars - 1]; + } return si.position + end; + } } Q_ASSERT(glyph_pos != -1); int j; |