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#include "searchlineedit.h"

#include <QtGui/QPainter>

#include <QtGui/QMouseEvent>

#include <QtGui/QMenu>

#include <QtGui/QStyle>

#include <QtGui/QStyleOptionFrameV2>

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);

    QColor color = palette().color(QPalette::Mid);

    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);

        QStyleOptionFrameV2 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;

}