searchlineedit.cpp Example File
demos/browser/searchlineedit.cpp
#include "searchlineedit.h"
#include <QtGui/QAbstractButton>
#include <QtGui/QPainter>
#include <QtGui/QMouseEvent>
#include <QtGui/QMenu>
#include <QtGui/QStyle>
#include <QtGui/QStyleOptionFrameV2>
class ClearButton : public QAbstractButton {
public:
ClearButton(QWidget *parent = 0);
void paintEvent(QPaintEvent *event);
};
ClearButton::ClearButton(QWidget *parent)
: QAbstractButton(parent)
{
setCursor(Qt::ArrowCursor);
setToolTip(tr("Clear"));
setVisible(false);
setFocusPolicy(Qt::NoFocus);
}
void ClearButton::paintEvent(QPaintEvent *event)
{
Q_UNUSED(event);
QPainter painter(this);
int height = parentWidget()->geometry().height();
painter.setRenderHint(QPainter::Antialiasing, true);
painter.setPen(Qt::lightGray);
painter.setBrush(isDown() ? Qt::darkGray : Qt::lightGray);
int offset = width() / 5;
int radius = width() - offset * 2;
painter.drawEllipse(offset, offset, radius, radius);
painter.setPen(Qt::white);
int border = offset * 2;
painter.drawLine(border, border, width() - border, height - border);
painter.drawLine(border, height - border, width() - border, border);
}
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("SearchButton");
setCursor(Qt::ArrowCursor);
setFocusPolicy(Qt::NoFocus);
}
void SearchButton::mousePressEvent(QMouseEvent *event)
{
if (m_menu
&& event->button() == Qt::LeftButton) {
QWidget *p = qobject_cast<QWidget*>(parent());
if (p) {
QPoint r = p->mapToGlobal(QPoint(0, p->height()));
m_menu->exec(QPoint(r.x() + height() / 2, r.y()));
}
}
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);
}
}
SearchLineEdit::SearchLineEdit(QWidget *parent) : QLineEdit(parent),
m_searchButton(new SearchButton(this)),
m_clearButton(new ClearButton(this))
{
connect(m_clearButton, SIGNAL(clicked()), this, SLOT(clear()));
connect(this, SIGNAL(textChanged(const QString&)), this, SLOT(textChanged()));
m_inactiveText = tr("Search");
QSizePolicy policy = sizePolicy();
setSizePolicy(QSizePolicy::Preferred, policy.verticalPolicy());
}
SearchLineEdit::~SearchLineEdit()
{
}
void SearchLineEdit::paintEvent(QPaintEvent *event)
{
if (text().isEmpty() && !hasFocus() && !m_inactiveText.isEmpty()) {
QLineEdit::paintEvent(event);
QStyleOptionFrameV2 panel;
initStyleOption(&panel);
QRect r = style()->subElementRect(QStyle::SE_LineEditContents, &panel, this);
QFontMetrics fm = fontMetrics();
static const int horizontalMargin = 2;
QRect lineRect(r.x() + horizontalMargin, 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 {
QLineEdit::paintEvent(event);
}
}
void SearchLineEdit::resizeEvent(QResizeEvent *event)
{
updateGeometries();
QLineEdit::resizeEvent(event);
}
void SearchLineEdit::updateGeometries()
{
int h = height();
int menuWidth = h + 1;
if (!m_searchButton->m_menu)
menuWidth = (h / 5) * 4;
m_searchButton->setGeometry(QRect(0, 0, menuWidth, h));
m_clearButton->setGeometry(QRect(width() - h, 0, h, h));
QString styleSheet = QString("SearchLineEdit { padding-right: %3px; padding-left: %2px; }")
.arg(menuWidth)
.arg(h);
setStyleSheet(styleSheet);
}
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;
}
void SearchLineEdit::textChanged()
{
m_clearButton->setVisible(!text().isEmpty());
}