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[LocationCompleter] New highlighter algorithm using QTextLayout that fixes rendering of RTL strings.
This commit is contained in:
S. Razi Alavizadeh
parent
7a1f4c77cd
commit
877266b418
@ -24,6 +24,7 @@
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#include <QPainter>
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#include <QApplication>
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#include <QMouseEvent>
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#include <QTextLayout>
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LocationCompleterDelegate::LocationCompleterDelegate(LocationCompleterView* parent)
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: QStyledItemDelegate(parent)
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@ -100,10 +101,10 @@ void LocationCompleterDelegate::paint(QPainter* painter, const QStyleOptionViewI
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// RTL Support: remove conflicting of right-aligned text and starpixmap!
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const int rightTitleEdge = rightPosition - m_padding - starPixmapWidth;
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QRect titleRect(leftTitleEdge, opt.rect.top() + m_padding, rightTitleEdge - leftTitleEdge, titleMetrics.height());
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QString title(titleMetrics.elidedText(index.data(LocationCompleterModel::TitleRole).toString(), Qt::ElideRight, titleRect.width()));
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QString title = index.data(LocationCompleterModel::TitleRole).toString();
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painter->setFont(titleFont);
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drawHighlightedTextLine(titleRect, title, searchText, painter, style, opt, colorRole);
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viewItemDrawText(painter, &opt, titleRect, title, colorRole, searchText);
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// Draw link
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const int infoYPos = titleRect.bottom() + opt.fontMetrics.leading() + 2;
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@ -122,7 +123,6 @@ void LocationCompleterDelegate::paint(QPainter* painter, const QStyleOptionViewI
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link = QString::fromLatin1(linkArray.left(500));
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}
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link = opt.fontMetrics.elidedText(link, Qt::ElideRight, linkRect.width());
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painter->setFont(opt.font);
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// Draw url (or switch to tab)
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@ -136,10 +136,10 @@ void LocationCompleterDelegate::paint(QPainter* painter, const QStyleOptionViewI
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QRect textRect(linkRect);
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textRect.setX(textRect.x() + m_padding + 16 + m_padding);
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drawTextLine(textRect, LocationCompleterView::tr("Switch to tab"), painter, style, opt, colorLinkRole);
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viewItemDrawText(painter, &opt, textRect, LocationCompleterView::tr("Switch to tab"), colorLinkRole);
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}
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else {
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drawHighlightedTextLine(linkRect, link, searchText, painter, style, opt, colorLinkRole);
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viewItemDrawText(painter, &opt, linkRect, link, colorLinkRole, searchText);
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}
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// Draw line at the very bottom of item if the item is not highlighted
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@ -185,150 +185,128 @@ bool LocationCompleterDelegate::drawSwitchToTab() const
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return qzSettings->showSwitchTab && m_drawSwitchToTab;
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}
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QRect LocationCompleterDelegate::adjustRect(const QRect &original, const QRect &created) const
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{
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if (created.left() + created.width() >= original.right()) {
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QRect nRect = created;
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nRect.setWidth(original.right() - created.left());
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return nRect;
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}
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return created;
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}
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static bool sizeBiggerThan(const QString &s1, const QString &s2)
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{
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return s1.size() > s2.size();
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}
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void LocationCompleterDelegate::drawHighlightedTextLine(const QRect &rect, const QString &text, const QString &searchText,
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QPainter* painter, const QStyle* style, const QStyleOptionViewItemV4 &option,
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const QPalette::ColorRole &role) const
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static QSizeF viewItemTextLayout(QTextLayout &textLayout, int lineWidth)
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{
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QList<int> delimiters;
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QStringList searchStrings = searchText.split(QLatin1Char(' '), QString::SkipEmptyParts);
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qreal height = 0;
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qreal widthUsed = 0;
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textLayout.beginLayout();
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QTextLine line = textLayout.createLine();
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if (line.isValid()) {
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line.setLineWidth(lineWidth);
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line.setPosition(QPointF(0, height));
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height += line.height();
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widthUsed = qMax(widthUsed, line.naturalTextWidth());
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// Look for longer parts first
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qSort(searchStrings.begin(), searchStrings.end(), sizeBiggerThan);
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foreach (const QString &string, searchStrings) {
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int delimiter = text.indexOf(string, 0, Qt::CaseInsensitive);
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while (delimiter != -1) {
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int start = delimiter;
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int end = delimiter + string.length();
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bool alreadyContains = false;
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for (int i = 0; i < delimiters.count(); ++i) {
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int dStart = delimiters.at(i);
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int dEnd = delimiters.at(++i);
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if (dStart <= start && dEnd >= end) {
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alreadyContains = true;
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break;
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}
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}
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if (!alreadyContains) {
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delimiters.append(start);
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delimiters.append(end);
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}
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delimiter = text.indexOf(string, end, Qt::CaseInsensitive);
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}
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}
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// We need to sort delimiters to properly paint all parts that user typed
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qSort(delimiters);
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// If we don't find any match, just paint it without any highlight
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if (delimiters.isEmpty() || delimiters.count() % 2) {
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drawTextLine(rect, text, painter, style, option, role);
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return;
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}
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QFont normalFont = painter->font();
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QFont boldFont = normalFont;
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boldFont.setBold(true);
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QFontMetrics normalMetrics(normalFont);
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QFontMetrics boldMetrics(boldFont);
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int lastEndPos = 0;
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int lastRectPos = rect.left();
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while (!delimiters.isEmpty()) {
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int start = delimiters.takeFirst();
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int end = delimiters.takeFirst();
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const QString normalPart = text.mid(lastEndPos, start - lastEndPos);
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const QString boldPart = text.mid(start, end - start);
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lastEndPos = end;
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if (!normalPart.isEmpty()) {
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int width = normalMetrics.width(normalPart);
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QRect nRect = adjustRect(rect, QRect(lastRectPos, rect.top(), width, rect.height()));
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if (nRect.width() > 0) {
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if (text.isRightToLeft()) {
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nRect = style->visualRect(Qt::RightToLeft, rect, nRect);
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}
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painter->setFont(normalFont);
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drawTextLine(nRect, normalPart, painter, style, option, role);
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lastRectPos += nRect.width();
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}
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}
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if (!boldPart.isEmpty()) {
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int width = boldMetrics.width(boldPart);
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QRect bRect = adjustRect(rect, QRect(lastRectPos, rect.top(), width, rect.height()));
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if (bRect.width() > 0) {
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if (text.isRightToLeft()) {
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bRect = style->visualRect(Qt::RightToLeft, rect, bRect);
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}
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painter->setFont(boldFont);
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drawTextLine(bRect, boldPart, painter, style, option, role);
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// Paint manually line under text instead of using QFont::underline
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QRect underlineRect(bRect.left(), bRect.top() + boldMetrics.ascent() + 1,
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bRect.width(), boldFont.pointSize() > 8 ? 2 : 1);
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painter->fillRect(underlineRect, option.palette.color(role));
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lastRectPos += bRect.width();
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}
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}
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if (delimiters.isEmpty() && lastEndPos != text.size()) {
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const QString lastText = text.mid(lastEndPos);
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int width = normalMetrics.width(lastText);
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QRect nRect = adjustRect(rect, QRect(lastRectPos, rect.top(), width, rect.height()));
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if (text.isRightToLeft()) {
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nRect = style->visualRect(Qt::RightToLeft, rect, nRect);
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}
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painter->setFont(normalFont);
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drawTextLine(nRect, lastText, painter, style, option, role);
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}
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textLayout.endLayout();
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}
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return QSizeF(widthUsed, height);
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}
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void LocationCompleterDelegate::drawTextLine(const QRect &rect, QString text, QPainter* painter,
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const QStyle* style, const QStyleOptionViewItemV4 &option,
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const QPalette::ColorRole &role) const
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// most of codes taken from QCommonStylePrivate::viewItemDrawText()
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// added highlighting and simplified for single-line textlayouts
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void LocationCompleterDelegate::viewItemDrawText(QPainter *p, const QStyleOptionViewItemV4 *option, const QRect &rect,
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const QString &text, const QPalette::ColorRole &role, const QString &searchText) const
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{
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if (rect.width() > 0) {
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const Qt::LayoutDirection direction = option.widget ? option.widget->layoutDirection() : QApplication::layoutDirection();
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Qt::LayoutDirection textDirection = text.isRightToLeft() ? Qt::RightToLeft : Qt::LeftToRight;
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Qt::Alignment alignment = textDirection == direction ? Qt::AlignLeft : Qt::AlignRight;
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const QColor &color = option->palette.color(role);
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const QWidget *widget = option->widget;
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const QStyle* proxyStyle = widget ? widget->style()->proxy() : QApplication::style()->proxy();
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const int textMargin = proxyStyle->pixelMetric(QStyle::PM_FocusFrameHMargin, 0, widget) + 1;
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// Insert unicode control characters: prepend RLE or LRE and append (RLM or LRM)+PDF
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text.isRightToLeft() ? text.prepend(QChar(0x202B)).append(0x200F) : text.prepend(QChar(0x202A)).append(0x200E);
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text.append(QChar(0x202C));
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QRect textRect = rect.adjusted(textMargin, 0, -textMargin, 0); // remove width padding
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const QFontMetrics &fontMetrics(p->font());
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// a workaround for not drawing highlighted text on icon
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const QString &elidedText = fontMetrics.elidedText(text, option->textElideMode, textRect.width() - 2 * m_padding - 2);
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QTextOption textOption;
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textOption.setWrapMode(QTextOption::NoWrap);
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textOption.setTextDirection(text.isRightToLeft() ? Qt::RightToLeft : Qt::LeftToRight);
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textOption.setAlignment(QStyle::visualAlignment(textOption.textDirection(), option->displayAlignment));
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QTextLayout textLayout;
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textLayout.setFont(p->font());
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textLayout.setText(elidedText);
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textLayout.setTextOption(textOption);
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style->drawItemText(painter, rect, Qt::TextSingleLine | alignment, option.palette, true, text, role);
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if (!searchText.isEmpty()) {
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QList<int> delimiters;
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QStringList searchStrings = searchText.split(QLatin1Char(' '), QString::SkipEmptyParts);
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// Look for longer parts first
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qSort(searchStrings.begin(), searchStrings.end(), sizeBiggerThan);
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foreach (const QString &string, searchStrings) {
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int delimiter = text.indexOf(string, 0, Qt::CaseInsensitive);
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while (delimiter != -1) {
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int start = delimiter;
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int end = delimiter + string.length();
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bool alreadyContains = false;
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for (int i = 0; i < delimiters.count(); ++i) {
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int dStart = delimiters.at(i);
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int dEnd = delimiters.at(++i);
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if (dStart <= start && dEnd >= end) {
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alreadyContains = true;
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break;
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}
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}
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if (!alreadyContains) {
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delimiters.append(start);
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delimiters.append(end);
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}
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delimiter = text.indexOf(string, end, Qt::CaseInsensitive);
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}
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}
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// We need to sort delimiters to properly paint all parts that user typed
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qSort(delimiters);
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// If we don't find any match, just paint it without any highlight
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if (!delimiters.isEmpty() && !(delimiters.count() % 2)) {
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QList<QTextLayout::FormatRange> highlightParts;
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QTextLayout::FormatRange lighterWholeLine;
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lighterWholeLine.start = 0;
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lighterWholeLine.length = elidedText.size();
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QColor lighterColor = color.lighter(130);
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if (lighterColor == color) {
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lighterColor = QColor(Qt::gray).darker(180);
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}
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lighterWholeLine.format.setForeground(lighterColor);
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highlightParts << lighterWholeLine;
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while (!delimiters.isEmpty()) {
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QTextLayout::FormatRange highlightedPart;
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int start = delimiters.takeFirst();
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int end = delimiters.takeFirst();
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highlightedPart.start = start;
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highlightedPart.length = end - start;
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highlightedPart.format.setFontWeight(QFont::Bold);
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highlightedPart.format.setUnderlineStyle(QTextCharFormat::SingleUnderline);
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highlightedPart.format.setForeground(color);
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highlightParts << highlightedPart;
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}
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textLayout.setAdditionalFormats(highlightParts);
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}
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}
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// do layout
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viewItemTextLayout(textLayout, textRect.width());
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// draw line
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p->setPen(color);
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const int lineCount = textLayout.lineCount();
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if (lineCount > 0) {
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qreal height = textLayout.lineAt(0).height();
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qreal width = qMax<qreal>(textRect.width(), textLayout.lineAt(0).width());
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const QRect &layoutRect = QStyle::alignedRect(option->direction, option->displayAlignment, QSize(int(width), int(height)), textRect);
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const QPointF &position = layoutRect.topLeft();
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textLayout.lineAt(0).draw(p, position);
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}
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}
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@ -36,15 +36,10 @@ public:
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private:
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bool drawSwitchToTab() const;
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QRect adjustRect(const QRect &original, const QRect &created) const;
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void drawHighlightedTextLine(const QRect &rect, const QString &text, const QString &searchText,
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QPainter* painter, const QStyle* style, const QStyleOptionViewItemV4 &option,
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const QPalette::ColorRole &role) const;
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void drawTextLine(const QRect &rect, QString text, QPainter* painter,
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const QStyle* style, const QStyleOptionViewItemV4 &option,
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const QPalette::ColorRole &role) const;
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void viewItemDrawText(QPainter *p, const QStyleOptionViewItemV4 *option, const QRect &rect,
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const QString &text, const QPalette::ColorRole &role,
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const QString &searchText = QString()) const;
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mutable int m_rowHeight;
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mutable int m_padding;
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