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Widgets: use QStringRef to optimize memory allocation

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Replace substring functions that return QString with
corresponding functions that return QStringRef where
it's possible.

Create QString from QStringRef only where necessary.

Change-Id: Id1c39093199519f2794b11560c2c0ded2d52b928
Reviewed-by: Marc Mutz <marc.mutz@kdab.com>
This commit is contained in:
Anton Kudryavtsev 2016-04-05 18:39:14 +03:00
parent 9d0dbc32dd
commit 9b699fa839
8 changed files with 24 additions and 20 deletions
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4
src/widgets/dialogs/qfiledialog.cpp
View File

@ -3823,11 +3823,11 @@ QString QFileDialogPrivate::getEnvironmentVariable(const QString &string)
{
#ifdef Q_OS_UNIX
if (string.size() > 1 && string.startsWith(QLatin1Char('$'))) {
return QString::fromLocal8Bit(qgetenv(string.mid(1).toLatin1().constData()));
return QString::fromLocal8Bit(qgetenv(string.midRef(1).toLatin1().constData()));
}
#else
if (string.size() > 2 && string.startsWith(QLatin1Char('%')) && string.endsWith(QLatin1Char('%'))) {
return QString::fromLocal8Bit(qgetenv(string.mid(1, string.size() - 2).toLatin1().constData()));
return QString::fromLocal8Bit(qgetenv(string.midRef(1, string.size() - 2).toLatin1().constData()));
}
#endif
return string;

12
src/widgets/styles/qfusionstyle.cpp
View File

@ -1649,7 +1649,7 @@ void QFusionStyle::drawControl(ControlElement element, const QStyleOption *optio
QRect textRect(xpos, y + windowsItemVMargin, w - xm - windowsRightBorder - tab + 1, h - 2 * windowsItemVMargin);
QRect vTextRect = visualRect(opt->direction, menuitem->rect, textRect);
QString s = menuitem->text;
QStringRef s(&menuitem->text);
if (!s.isEmpty()) { // draw text
p->save();
int t = s.indexOf(QLatin1Char('\t'));
@ -1660,12 +1660,13 @@ void QFusionStyle::drawControl(ControlElement element, const QStyleOption *optio
if (t >= 0) {
QRect vShortcutRect = visualRect(opt->direction, menuitem->rect,
QRect(textRect.topRight(), QPoint(menuitem->rect.right(), textRect.bottom())));
const QString textToDraw = s.mid(t + 1).toString();
if (dis && !act && proxy()->styleHint(SH_EtchDisabledText, option, widget)) {
p->setPen(menuitem->palette.light().color());
p->drawText(vShortcutRect.adjusted(1, 1, 1, 1), text_flags, s.mid(t + 1));
p->drawText(vShortcutRect.adjusted(1, 1, 1, 1), text_flags, textToDraw);
p->setPen(discol);
}
p->drawText(vShortcutRect, text_flags, s.mid(t + 1));
p->drawText(vShortcutRect, text_flags, textToDraw);
s = s.left(t);
}
QFont font = menuitem->font;
@ -1680,12 +1681,13 @@ void QFusionStyle::drawControl(ControlElement element, const QStyleOption *optio
font.setBold(true);
p->setFont(font);
const QString textToDraw = s.left(t).toString();
if (dis && !act && proxy()->styleHint(SH_EtchDisabledText, option, widget)) {
p->setPen(menuitem->palette.light().color());
p->drawText(vTextRect.adjusted(1, 1, 1, 1), text_flags, s.left(t));
p->drawText(vTextRect.adjusted(1, 1, 1, 1), text_flags, textToDraw);
p->setPen(discol);
}
p->drawText(vTextRect, text_flags, s.left(t));
p->drawText(vTextRect, text_flags, textToDraw);
p->restore();
}

6
src/widgets/styles/qstylesheetstyle.cpp
View File

@ -3679,7 +3679,7 @@ void QStyleSheetStyle::drawControl(ControlElement ce, const QStyleOption *opt, Q
QRect textRect = subRule.contentsRect(opt->rect);
textRect.setWidth(textRect.width() - mi.tabWidth);
QString s = mi.text;
QStringRef s(&mi.text);
p->setPen(mi.palette.buttonText().color());
if (!s.isEmpty()) {
int text_flags = Qt::AlignLeft | Qt::AlignVCenter | Qt::TextShowMnemonic | Qt::TextDontClip | Qt::TextSingleLine;
@ -3689,10 +3689,10 @@ void QStyleSheetStyle::drawControl(ControlElement ce, const QStyleOption *opt, Q
if (t >= 0) {
QRect vShortcutRect = visualRect(opt->direction, mi.rect,
QRect(textRect.topRight(), QPoint(mi.rect.right(), textRect.bottom())));
p->drawText(vShortcutRect, text_flags, s.mid(t + 1));
p->drawText(vShortcutRect, text_flags, s.mid(t + 1).toString());
s = s.left(t);
}
p->drawText(textRect, text_flags, s.left(t));
p->drawText(textRect, text_flags, s.left(t).toString());
}
if (mi.menuItemType == QStyleOptionMenuItem::SubMenu) {// draw sub menu arrow

12
src/widgets/styles/qwindowsstyle.cpp
View File

@ -1198,7 +1198,7 @@ void QWindowsStyle::drawControl(ControlElement ce, const QStyleOption *opt, QPai
QRect textRect(xpos, y + QWindowsStylePrivate::windowsItemVMargin,
w - xm - QWindowsStylePrivate::windowsRightBorder - tab + 1, h - 2 * QWindowsStylePrivate::windowsItemVMargin);
QRect vTextRect = visualRect(opt->direction, menuitem->rect, textRect);
QString s = menuitem->text;
QStringRef s(&menuitem->text);
if (!s.isEmpty()) { // draw text
p->save();
int t = s.indexOf(QLatin1Char('\t'));
@ -1209,24 +1209,26 @@ void QWindowsStyle::drawControl(ControlElement ce, const QStyleOption *opt, QPai
if (t >= 0) {
QRect vShortcutRect = visualRect(opt->direction, menuitem->rect,
QRect(textRect.topRight(), QPoint(menuitem->rect.right(), textRect.bottom())));
const QString textToDraw = s.mid(t + 1).toString();
if (dis && !act && proxy()->styleHint(SH_EtchDisabledText, opt, widget)) {
p->setPen(menuitem->palette.light().color());
p->drawText(vShortcutRect.adjusted(1,1,1,1), text_flags, s.mid(t + 1));
p->drawText(vShortcutRect.adjusted(1, 1, 1, 1), text_flags, textToDraw);
p->setPen(discol);
}
p->drawText(vShortcutRect, text_flags, s.mid(t + 1));
p->drawText(vShortcutRect, text_flags, textToDraw);
s = s.left(t);
}
QFont font = menuitem->font;
if (menuitem->menuItemType == QStyleOptionMenuItem::DefaultItem)
font.setBold(true);
p->setFont(font);
const QString textToDraw = s.left(t).toString();
if (dis && !act && proxy()->styleHint(SH_EtchDisabledText, opt, widget)) {
p->setPen(menuitem->palette.light().color());
p->drawText(vTextRect.adjusted(1,1,1,1), text_flags, s.left(t));
p->drawText(vTextRect.adjusted(1, 1, 1, 1), text_flags, textToDraw);
p->setPen(discol);
}
p->drawText(vTextRect, text_flags, s.left(t));
p->drawText(vTextRect, text_flags, textToDraw);
p->restore();
}
if (menuitem->menuItemType == QStyleOptionMenuItem::SubMenu) {// draw sub menu arrow

2
src/widgets/widgets/qcalendarwidget.cpp
View File

@ -554,7 +554,7 @@ void QCalendarDateValidator::setFormat(const QString &format)
bool quoting = false;
QString separator;
while (pos < format.size()) {
QString mid = format.mid(pos);
const QStringRef mid = format.midRef(pos);
int offset = 1;
if (mid.startsWith(quote)) {

2
src/widgets/widgets/qlineedit_p.cpp
View File

@ -97,7 +97,7 @@ void QLineEditPrivate::_q_completionHighlighted(const QString &newText)
} else {
int c = control->cursor();
QString text = control->text();
q->setText(text.left(c) + newText.mid(c));
q->setText(text.leftRef(c) + newText.midRef(c));
control->moveCursor(control->end(), false);
#ifndef Q_OS_ANDROID
const bool mark = true;

4
src/widgets/widgets/qwidgetlinecontrol.cpp
View File

@ -1180,14 +1180,14 @@ QString QWidgetLineControl::maskString(uint pos, const QString &str, bool clear)
int n = findInMask(i, true, true, str[(int)strIndex]);
if (n != -1) {
if (str.length() != 1 || i == 0 || (i > 0 && (!m_maskData[i-1].separator || m_maskData[i-1].maskChar != str[(int)strIndex]))) {
s += fill.mid(i, n-i+1);
s += fill.midRef(i, n - i + 1);
i = n + 1; // update i to find + 1
}
} else {
// search for valid m_blank if not
n = findInMask(i, true, false, str[(int)strIndex]);
if (n != -1) {
s += fill.mid(i, n-i);
s += fill.midRef(i, n - i);
switch (m_maskData[n].caseMode) {
case MaskInputData::Upper:
s += str[(int)strIndex].toUpper();

2
src/widgets/widgets/qwidgettextcontrol.cpp
View File

@ -2123,7 +2123,7 @@ QVariant QWidgetTextControl::inputMethodQuery(Qt::InputMethodQuery property, QVa
tmpCursor.movePosition(QTextCursor::NextBlock);
--numBlocks;
}
result += block.text().mid(0,localPos);
result += block.text().midRef(0, localPos);
return QVariant(result);
}
default: