searchlineedit.cpp Example File

webenginewidgets/demobrowser/searchlineedit.cpp
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#include "searchlineedit.h" #include <QtGui/QPainter> #include <QtGui/QMouseEvent> #include <QtWidgets/QMenu> #include <QtWidgets/QStyle> #include <QtWidgets/QStyleOptionFrame> ClearButton::ClearButton(QWidget *parent) : QAbstractButton(parent) { #ifndef QT_NO_CURSOR setCursor(Qt::ArrowCursor); #endif // QT_NO_CURSOR setToolTip(tr("Clear")); setVisible(false); setFocusPolicy(Qt::NoFocus); } void ClearButton::paintEvent(QPaintEvent *event) { Q_UNUSED(event); QPainter painter(this); int height = this->height(); painter.setRenderHint(QPainter::Antialiasing, true); painter.setBrush(isDown() ? palette().color(QPalette::Dark) : palette().color(QPalette::Mid)); painter.setPen(painter.brush().color()); int size = width(); int offset = size / 5; int radius = size - offset * 2; painter.drawEllipse(offset, offset, radius, radius); painter.setPen(palette().color(QPalette::Base)); int border = offset * 2; painter.drawLine(border, border, width() - border, height - border); painter.drawLine(border, height - border, width() - border, border); } void ClearButton::textChanged(const QString &text) { setVisible(!text.isEmpty()); } /* Search icon on the left hand side of the search widget When a menu is set a down arrow appears */ class SearchButton : public QAbstractButton { public: SearchButton(QWidget *parent = 0); void paintEvent(QPaintEvent *event); QMenu *m_menu; protected: void mousePressEvent(QMouseEvent *event); }; SearchButton::SearchButton(QWidget *parent) : QAbstractButton(parent), m_menu(0) { setObjectName(QLatin1String("SearchButton")); #ifndef QT_NO_CURSOR setCursor(Qt::ArrowCursor); #endif //QT_NO_CURSOR setFocusPolicy(Qt::NoFocus); } void SearchButton::mousePressEvent(QMouseEvent *event) { if (m_menu && event->button() == Qt::LeftButton) { QWidget *p = parentWidget(); if (p) { QPoint r = p->mapToGlobal(QPoint(0, p->height())); m_menu->exec(QPoint(r.x() + height() / 2, r.y())); } event->accept(); } QAbstractButton::mousePressEvent(event); } void SearchButton::paintEvent(QPaintEvent *event) { Q_UNUSED(event); QPainterPath myPath; int radius = (height() / 5) * 2; QRect circle(height() / 3 - 1, height() / 4, radius, radius); myPath.addEllipse(circle); myPath.arcMoveTo(circle, 300); QPointF c = myPath.currentPosition(); int diff = height() / 7; myPath.lineTo(qMin(width() - 2, (int)c.x() + diff), c.y() + diff); QPainter painter(this); painter.setRenderHint(QPainter::Antialiasing, true); painter.setPen(QPen(Qt::darkGray, 2)); painter.drawPath(myPath); if (m_menu) { QPainterPath dropPath; dropPath.arcMoveTo(circle, 320); QPointF c = dropPath.currentPosition(); c = QPointF(c.x() + 3.5, c.y() + 0.5); dropPath.moveTo(c); dropPath.lineTo(c.x() + 4, c.y()); dropPath.lineTo(c.x() + 2, c.y() + 2); dropPath.closeSubpath(); painter.setPen(Qt::darkGray); painter.setBrush(Qt::darkGray); painter.setRenderHint(QPainter::Antialiasing, false); painter.drawPath(dropPath); } painter.end(); } /* SearchLineEdit is an enhanced QLineEdit - A Search icon on the left with optional menu - When there is no text and doesn't have focus an "inactive text" is displayed - When there is text a clear button is displayed on the right hand side */ SearchLineEdit::SearchLineEdit(QWidget *parent) : ExLineEdit(parent), m_searchButton(new SearchButton(this)) { connect(lineEdit(), SIGNAL(textChanged(QString)), this, SIGNAL(textChanged(QString))); setLeftWidget(m_searchButton); m_inactiveText = tr("Search"); QSizePolicy policy = sizePolicy(); setSizePolicy(QSizePolicy::Preferred, policy.verticalPolicy()); } void SearchLineEdit::paintEvent(QPaintEvent *event) { if (lineEdit()->text().isEmpty() && !hasFocus() && !m_inactiveText.isEmpty()) { ExLineEdit::paintEvent(event); QStyleOptionFrame panel; initStyleOption(&panel); QRect r = style()->subElementRect(QStyle::SE_LineEditContents, &panel, this); QFontMetrics fm = fontMetrics(); int horizontalMargin = lineEdit()->x(); QRect lineRect(horizontalMargin + r.x(), r.y() + (r.height() - fm.height() + 1) / 2, r.width() - 2 * horizontalMargin, fm.height()); QPainter painter(this); painter.setPen(palette().brush(QPalette::Disabled, QPalette::Text).color()); painter.drawText(lineRect, Qt::AlignLeft|Qt::AlignVCenter, m_inactiveText); } else { ExLineEdit::paintEvent(event); } } void SearchLineEdit::resizeEvent(QResizeEvent *event) { updateGeometries(); ExLineEdit::resizeEvent(event); } void SearchLineEdit::updateGeometries() { int menuHeight = height(); int menuWidth = menuHeight + 1; if (!m_searchButton->m_menu) menuWidth = (menuHeight / 5) * 4; m_searchButton->resize(QSize(menuWidth, menuHeight)); } QString SearchLineEdit::inactiveText() const { return m_inactiveText; } void SearchLineEdit::setInactiveText(const QString &text) { m_inactiveText = text; } void SearchLineEdit::setMenu(QMenu *menu) { if (m_searchButton->m_menu) m_searchButton->m_menu->deleteLater(); m_searchButton->m_menu = menu; updateGeometries(); } QMenu *SearchLineEdit::menu() const { if (!m_searchButton->m_menu) { m_searchButton->m_menu = new QMenu(m_searchButton); if (isVisible()) (const_cast<SearchLineEdit*>(this))->updateGeometries(); } return m_searchButton->m_menu; }

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