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     3 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).

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     7 ** This file is part of the demonstration applications of the Qt Toolkit.

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    16 ** GNU Lesser General Public License Usage

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    38 ** $QT_END_LICENSE$

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    40 ****************************************************************************/

    41 

    42 #include "searchlineedit.h"

    43 

    44 #include <QtGui/QPainter>

    45 #include <QtGui/QMouseEvent>

    46 #include <QtGui/QMenu>

    47 #include <QtGui/QStyle>

    48 #include <QtGui/QStyleOptionFrameV2>

    49 

    50 ClearButton::ClearButton(QWidget *parent)

    51   : QAbstractButton(parent)

    52 {

    53 #ifndef QT_NO_CURSOR

    54     setCursor(Qt::ArrowCursor);

    55 #endif // QT_NO_CURSOR

    56     setToolTip(tr("Clear"));

    57     setVisible(false);

    58     setFocusPolicy(Qt::NoFocus);

    59 }

    60 

    61 void ClearButton::paintEvent(QPaintEvent *event)

    62 {

    63     Q_UNUSED(event);

    64     QPainter painter(this);

    65     int height = this->height();

    66 

    67     painter.setRenderHint(QPainter::Antialiasing, true);

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

    69     painter.setBrush(isDown()

    70                      ? palette().color(QPalette::Dark)

    71                      : palette().color(QPalette::Mid));

    72     painter.setPen(painter.brush().color());

    73     int size = width();

    74     int offset = size / 5;

    75     int radius = size - offset * 2;

    76     painter.drawEllipse(offset, offset, radius, radius);

    77 

    78     painter.setPen(palette().color(QPalette::Base));

    79     int border = offset * 2;

    80     painter.drawLine(border, border, width() - border, height - border);

    81     painter.drawLine(border, height - border, width() - border, border);

    82 }

    83 

    84 void ClearButton::textChanged(const QString &text)

    85 {

    86     setVisible(!text.isEmpty());

    87 }

    88 

    89 /*

    90     Search icon on the left hand side of the search widget

    91     When a menu is set a down arrow appears

    92  */

    93 class SearchButton : public QAbstractButton {

    94 public:

    95     SearchButton(QWidget *parent = 0);

    96     void paintEvent(QPaintEvent *event);

    97     QMenu *m_menu;

    98 

    99 protected:

   100     void mousePressEvent(QMouseEvent *event);

   101 };

   102 

   103 SearchButton::SearchButton(QWidget *parent)

   104   : QAbstractButton(parent),

   105     m_menu(0)

   106 {

   107     setObjectName(QLatin1String("SearchButton"));

   108 #ifndef QT_NO_CURSOR

   109     setCursor(Qt::ArrowCursor);

   110 #endif //QT_NO_CURSOR

   111     setFocusPolicy(Qt::NoFocus);

   112 }

   113 

   114 void SearchButton::mousePressEvent(QMouseEvent *event)

   115 {

   116     if (m_menu && event->button() == Qt::LeftButton) {

   117         QWidget *p = parentWidget();

   118         if (p) {

   119             QPoint r = p->mapToGlobal(QPoint(0, p->height()));

   120             m_menu->exec(QPoint(r.x() + height() / 2, r.y()));

   121         }

   122         event->accept();

   123     }

   124     QAbstractButton::mousePressEvent(event);

   125 }

   126 

   127 void SearchButton::paintEvent(QPaintEvent *event)

   128 {

   129     Q_UNUSED(event);

   130     QPainterPath myPath;

   131 

   132     int radius = (height() / 5) * 2;

   133     QRect circle(height() / 3 - 1, height() / 4, radius, radius);

   134     myPath.addEllipse(circle);

   135 

   136     myPath.arcMoveTo(circle, 300);

   137     QPointF c = myPath.currentPosition();

   138     int diff = height() / 7;

   139     myPath.lineTo(qMin(width() - 2, (int)c.x() + diff), c.y() + diff);

   140 

   141     QPainter painter(this);

   142     painter.setRenderHint(QPainter::Antialiasing, true);

   143     painter.setPen(QPen(Qt::darkGray, 2));

   144     painter.drawPath(myPath);

   145 

   146     if (m_menu) {

   147         QPainterPath dropPath;

   148         dropPath.arcMoveTo(circle, 320);

   149         QPointF c = dropPath.currentPosition();

   150         c = QPointF(c.x() + 3.5, c.y() + 0.5);

   151         dropPath.moveTo(c);

   152         dropPath.lineTo(c.x() + 4, c.y());

   153         dropPath.lineTo(c.x() + 2, c.y() + 2);

   154         dropPath.closeSubpath();

   155         painter.setPen(Qt::darkGray);

   156         painter.setBrush(Qt::darkGray);

   157         painter.setRenderHint(QPainter::Antialiasing, false);

   158         painter.drawPath(dropPath);

   159     }

   160     painter.end();

   161 }

   162 

   163 /*

   164     SearchLineEdit is an enhanced QLineEdit

   165     - A Search icon on the left with optional menu

   166     - When there is no text and doesn't have focus an "inactive text" is displayed

   167     - When there is text a clear button is displayed on the right hand side

   168  */

   169 SearchLineEdit::SearchLineEdit(QWidget *parent) : ExLineEdit(parent),

   170     m_searchButton(new SearchButton(this))

   171 {

   172     connect(lineEdit(), SIGNAL(textChanged(const QString &)),

   173             this, SIGNAL(textChanged(const QString &)));

   174     setLeftWidget(m_searchButton);

   175     m_inactiveText = tr("Search");

   176 

   177     QSizePolicy policy = sizePolicy();

   178     setSizePolicy(QSizePolicy::Preferred, policy.verticalPolicy());

   179 }

   180 

   181 void SearchLineEdit::paintEvent(QPaintEvent *event)

   182 {

   183     if (lineEdit()->text().isEmpty() && !hasFocus() && !m_inactiveText.isEmpty()) {

   184         ExLineEdit::paintEvent(event);

   185         QStyleOptionFrameV2 panel;

   186         initStyleOption(&panel);

   187         QRect r = style()->subElementRect(QStyle::SE_LineEditContents, &panel, this);

   188         QFontMetrics fm = fontMetrics();

   189         int horizontalMargin = lineEdit()->x();

   190         QRect lineRect(horizontalMargin + r.x(), r.y() + (r.height() - fm.height() + 1) / 2,

   191                        r.width() - 2 * horizontalMargin, fm.height());

   192         QPainter painter(this);

   193         painter.setPen(palette().brush(QPalette::Disabled, QPalette::Text).color());

   194         painter.drawText(lineRect, Qt::AlignLeft|Qt::AlignVCenter, m_inactiveText);

   195     } else {

   196         ExLineEdit::paintEvent(event);

   197     }

   198 }

   199 

   200 void SearchLineEdit::resizeEvent(QResizeEvent *event)

   201 {

   202     updateGeometries();

   203     ExLineEdit::resizeEvent(event);

   204 }

   205 

   206 void SearchLineEdit::updateGeometries()

   207 {

   208     int menuHeight = height();

   209     int menuWidth = menuHeight + 1;

   210     if (!m_searchButton->m_menu)

   211         menuWidth = (menuHeight / 5) * 4;

   212     m_searchButton->resize(QSize(menuWidth, menuHeight));

   213 }

   214 

   215 QString SearchLineEdit::inactiveText() const

   216 {

   217     return m_inactiveText;

   218 }

   219 

   220 void SearchLineEdit::setInactiveText(const QString &text)

   221 {

   222     m_inactiveText = text;

   223 }

   224 

   225 void SearchLineEdit::setMenu(QMenu *menu)

   226 {

   227     if (m_searchButton->m_menu)

   228         m_searchButton->m_menu->deleteLater();

   229     m_searchButton->m_menu = menu;

   230     updateGeometries();

   231 }

   232 

   233 QMenu *SearchLineEdit::menu() const

   234 {

   235     if (!m_searchButton->m_menu) {

   236         m_searchButton->m_menu = new QMenu(m_searchButton);

   237         if (isVisible())

   238             (const_cast<SearchLineEdit*>(this))->updateGeometries();

   239     }

   240     return m_searchButton->m_menu;

   241 }

   242