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+/****************************************************************************
+**
+** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: Qt Software Information (qt-info@nokia.com)
+**
+** This file is part of the tools applications of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** No Commercial Usage
+** This file contains pre-release code and may not be distributed.
+** You may use this file in accordance with the terms and conditions
+** contained in the either Technology Preview License Agreement or the
+** Beta Release License Agreement.
+**
+** GNU Lesser General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU Lesser
+** General Public License version 2.1 as published by the Free Software
+** Foundation and appearing in the file LICENSE.LGPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU Lesser General Public License version 2.1 requirements
+** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain
+** additional rights. These rights are described in the Nokia Qt LGPL
+** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
+** package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU
+** General Public License version 3.0 as published by the Free Software
+** Foundation and appearing in the file LICENSE.GPL included in the
+** packaging of this file.  Please review the following information to
+** ensure the GNU General Public License version 3.0 requirements will be
+** met: http://www.gnu.org/copyleft/gpl.html.
+**
+** If you are unsure which license is appropriate for your use, please
+** contact the sales department at qt-sales@nokia.com.
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+/*! \class AbstractFindWidget
+
+    \brief A search bar that is commonly added below a searchable widget.
+
+    \internal
+
+    This widget implements a search bar which becomes visible when the user
+    wants to start searching. It is a modern replacement for the commonly used
+    search dialog. It is usually placed below the target widget using a QVBoxLayout.
+
+    The search is incremental and can be set to case sensitive or whole words
+    using buttons available on the search bar.
+ */
+
+#include "abstractfindwidget.h"
+
+#include <QtCore/QEvent>
+#include <QtCore/QFile>
+#include <QtCore/QTimer>
+
+#include <QtGui/QCheckBox>
+#include <QtGui/QKeyEvent>
+#include <QtGui/QLabel>
+#include <QtGui/QLayout>
+#include <QtGui/QLineEdit>
+#include <QtGui/QSpacerItem>
+#include <QtGui/QToolButton>
+
+QT_BEGIN_NAMESPACE
+
+static QIcon createIconSet(const QString &name)
+{
+    QStringList candidates = QStringList()
+        << (QString::fromUtf8(":/trolltech/shared/images/") + name)
+#ifdef Q_WS_MAC
+        << (QString::fromUtf8(":/trolltech/shared/images/mac/") + name);
+#else
+        << (QString::fromUtf8(":/trolltech/shared/images/win/") + name);
+#endif
+
+    foreach (const QString &f, candidates) {
+        if (QFile::exists(f))
+            return QIcon(f);
+    }
+
+    return QIcon();
+}
+
+/*!
+    Constructs an AbstractFindWidget.
+
+    \a flags can change the layout and turn off certain features.
+    \a parent is passed to the QWidget constructor.
+ */
+AbstractFindWidget::AbstractFindWidget(FindFlags flags, QWidget *parent)
+    : QWidget(parent)
+{
+    QBoxLayout *topLayOut;
+    QBoxLayout *layOut;
+    if (flags & NarrowLayout) {
+        topLayOut = new QVBoxLayout(this);
+        layOut = new QHBoxLayout;
+        topLayOut->addLayout(layOut);
+    } else {
+        topLayOut = layOut = new QHBoxLayout(this);
+    }
+#ifndef Q_OS_MAC
+    topLayOut->setSpacing(6);
+    topLayOut->setMargin(0);
+#endif
+
+    m_toolClose = new QToolButton(this);
+    m_toolClose->setIcon(createIconSet(QLatin1String("closetab.png")));
+    m_toolClose->setAutoRaise(true);
+    layOut->addWidget(m_toolClose);
+    connect(m_toolClose, SIGNAL(clicked()), SLOT(deactivate()));
+
+    m_editFind = new QLineEdit(this);
+    layOut->addWidget(m_editFind);
+    connect(m_editFind, SIGNAL(returnPressed()), SLOT(findNext()));
+    connect(m_editFind, SIGNAL(textChanged(QString)), SLOT(findCurrentText()));
+    connect(m_editFind, SIGNAL(textChanged(QString)), SLOT(updateButtons()));
+
+    m_toolPrevious = new QToolButton(this);
+    m_toolPrevious->setAutoRaise(true);
+    m_toolPrevious->setText(tr("&Previous"));
+    m_toolPrevious->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
+    m_toolPrevious->setIcon(createIconSet(QLatin1String("previous.png")));
+    layOut->addWidget(m_toolPrevious);
+    connect(m_toolPrevious, SIGNAL(clicked()), SLOT(findPrevious()));
+
+    m_toolNext = new QToolButton(this);
+    m_toolNext->setAutoRaise(true);
+    m_toolNext->setText(tr("&Next"));
+    m_toolNext->setToolButtonStyle(Qt::ToolButtonTextBesideIcon);
+    m_toolNext->setIcon(createIconSet(QLatin1String("next.png")));
+    layOut->addWidget(m_toolNext);
+    connect(m_toolNext, SIGNAL(clicked()), SLOT(findNext()));
+
+    if (flags & NarrowLayout) {
+        QSizePolicy sp(QSizePolicy::Preferred, QSizePolicy::Fixed);
+        m_toolPrevious->setSizePolicy(sp);
+        m_toolPrevious->setMinimumWidth(m_toolPrevious->minimumSizeHint().height());
+        m_toolNext->setSizePolicy(sp);
+        m_toolNext->setMinimumWidth(m_toolNext->minimumSizeHint().height());
+
+        QSpacerItem *spacerItem =
+            new QSpacerItem(1, 1, QSizePolicy::Expanding, QSizePolicy::Minimum);
+        layOut->addItem(spacerItem);
+
+        layOut = new QHBoxLayout;
+        topLayOut->addLayout(layOut);
+    } else {
+        m_editFind->setMinimumWidth(150);
+    }
+
+    if (!(flags & NoCaseSensitive)) {
+        m_checkCase = new QCheckBox(tr("&Case sensitive"), this);
+        layOut->addWidget(m_checkCase);
+        connect(m_checkCase, SIGNAL(toggled(bool)), SLOT(findCurrentText()));
+    } else {
+        m_checkCase = 0;
+    }
+
+    if (!(flags & NoWholeWords)) {
+        m_checkWholeWords = new QCheckBox(tr("Whole &words"), this);
+        layOut->addWidget(m_checkWholeWords);
+        connect(m_checkWholeWords, SIGNAL(toggled(bool)), SLOT(findCurrentText()));
+    } else {
+        m_checkWholeWords = 0;
+    }
+
+    m_labelWrapped = new QLabel(this);
+    m_labelWrapped->setTextFormat(Qt::RichText);
+    m_labelWrapped->setAlignment(
+            Qt::AlignLeading | Qt::AlignLeft | Qt::AlignVCenter);
+    m_labelWrapped->setText(
+            tr("<img src=\":/trolltech/shared/images/wrap.png\">"
+                "&nbsp;Search wrapped"));
+    m_labelWrapped->hide();
+    layOut->addWidget(m_labelWrapped);
+
+    QSpacerItem *spacerItem =
+        new QSpacerItem(1, 1, QSizePolicy::Expanding, QSizePolicy::Minimum);
+    layOut->addItem(spacerItem);
+
+    setMinimumWidth(minimumSizeHint().width());
+
+    updateButtons();
+    hide();
+}
+
+/*!
+    Destroys the AbstractFindWidget.
+ */
+AbstractFindWidget::~AbstractFindWidget()
+{
+}
+
+/*!
+    Returns the icon set to be used for the action that initiates a search.
+ */
+QIcon AbstractFindWidget::findIconSet()
+{
+    return createIconSet(QLatin1String("searchfind.png"));
+}
+
+/*!
+    Activates the find widget, making it visible and having focus on its input
+    field.
+ */
+void AbstractFindWidget::activate()
+{
+    show();
+    m_editFind->selectAll();
+    m_editFind->setFocus(Qt::ShortcutFocusReason);
+}
+
+/*!
+    Deactivates the find widget, making it invisible and handing focus to any
+    associated QTextEdit.
+ */
+void AbstractFindWidget::deactivate()
+{
+    hide();
+}
+
+void AbstractFindWidget::findNext()
+{
+    findInternal(m_editFind->text(), true, false);
+}
+
+void AbstractFindWidget::findPrevious()
+{
+    findInternal(m_editFind->text(), true, true);
+}
+
+void AbstractFindWidget::findCurrentText()
+{
+    findInternal(m_editFind->text(), false, false);
+}
+
+void AbstractFindWidget::keyPressEvent(QKeyEvent *event)
+{
+    if (event->key() == Qt::Key_Escape) {
+        deactivate();
+        return;
+    }
+
+    QWidget::keyPressEvent(event);
+}
+
+void AbstractFindWidget::updateButtons()
+{
+    const bool en = !m_editFind->text().isEmpty();
+    m_toolPrevious->setEnabled(en);
+    m_toolNext->setEnabled(en);
+}
+
+void AbstractFindWidget::findInternal(const QString &ttf, bool skipCurrent, bool backward)
+{
+    bool found = false;
+    bool wrapped = false;
+    find(ttf, skipCurrent, backward, &found, &wrapped);
+    QPalette p;
+    p.setColor(QPalette::Active, QPalette::Base, found ? Qt::white : QColor(255, 102, 102));
+    m_editFind->setPalette(p);
+    m_labelWrapped->setVisible(wrapped);
+}
+
+bool AbstractFindWidget::caseSensitive() const
+{
+    return m_checkCase && m_checkCase->isChecked();
+}
+
+bool AbstractFindWidget::wholeWords() const
+{
+    return m_checkWholeWords && m_checkWholeWords->isChecked();
+}
+
+bool AbstractFindWidget::eventFilter(QObject *object, QEvent *e)
+{
+    if (isVisible() && e->type() == QEvent::KeyPress) {
+        QKeyEvent *ke = static_cast<QKeyEvent*>(e);
+        if (ke->key() == Qt::Key_Escape) {
+            hide();
+            return true;
+        }
+    }
+
+    return QWidget::eventFilter(object, e);
+}
+
+QT_END_NAMESPACE