/****************************************************************************

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** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

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

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** contained in the Technology Preview License Agreement accompanying

** this package.

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** General Public License version 2.1 as published by the Free Software

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****************************************************************************/

#include "urllineedit.h"

#include "browserapplication.h"

#include "searchlineedit.h"

#include "webview.h"

#include <QtCore/QEvent>

#include <QtGui/QApplication>

#include <QtGui/QCompleter>

#include <QtGui/QFocusEvent>

#include <QtGui/QHBoxLayout>

#include <QtGui/QLabel>

#include <QtGui/QLineEdit>

#include <QtGui/QPainter>

#include <QtGui/QStyle>

#include <QtGui/QStyleOptionFrameV2>

#include <QtCore/QDebug>

ExLineEdit::ExLineEdit(QWidget *parent)

    : QWidget(parent)

    , m_leftWidget(0)

    , m_lineEdit(new QLineEdit(this))

    , m_clearButton(0)

{

    setFocusPolicy(m_lineEdit->focusPolicy());

    setAttribute(Qt::WA_InputMethodEnabled);

    setSizePolicy(m_lineEdit->sizePolicy());

    setBackgroundRole(m_lineEdit->backgroundRole());

    setMouseTracking(true);

    setAcceptDrops(true);

    setAttribute(Qt::WA_MacShowFocusRect, true);

    QPalette p = m_lineEdit->palette();

    setPalette(p);

    // line edit

    m_lineEdit->setFrame(false);

    m_lineEdit->setFocusProxy(this);

    m_lineEdit->setAttribute(Qt::WA_MacShowFocusRect, false);

    QPalette clearPalette = m_lineEdit->palette();

    clearPalette.setBrush(QPalette::Base, QBrush(Qt::transparent));

    m_lineEdit->setPalette(clearPalette);

    // clearButton

    m_clearButton = new ClearButton(this);

    connect(m_clearButton, SIGNAL(clicked()),

            m_lineEdit, SLOT(clear()));

    connect(m_lineEdit, SIGNAL(textChanged(QString)),

            m_clearButton, SLOT(textChanged(QString)));

}

void ExLineEdit::setLeftWidget(QWidget *widget)

{

    m_leftWidget = widget;

}

QWidget *ExLineEdit::leftWidget() const

{

    return m_leftWidget;

}

void ExLineEdit::resizeEvent(QResizeEvent *event)

{

    Q_ASSERT(m_leftWidget);

    updateGeometries();

    QWidget::resizeEvent(event);

}

void ExLineEdit::updateGeometries()

{

    QStyleOptionFrameV2 panel;

    initStyleOption(&panel);

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

    int height = rect.height();

    int width = rect.width();

    int m_leftWidgetHeight = m_leftWidget->height();

    m_leftWidget->setGeometry(rect.x() + 2,          rect.y() + (height - m_leftWidgetHeight)/2,

                              m_leftWidget->width(), m_leftWidget->height());

    int clearButtonWidth = this->height();

    m_lineEdit->setGeometry(m_leftWidget->x() + m_leftWidget->width(),        0,

                            width - clearButtonWidth - m_leftWidget->width(), this->height());

    m_clearButton->setGeometry(this->width() - clearButtonWidth, 0,

                               clearButtonWidth, this->height());

}

void ExLineEdit::initStyleOption(QStyleOptionFrameV2 *option) const

{

    option->initFrom(this);

    option->rect = contentsRect();

    option->lineWidth = style()->pixelMetric(QStyle::PM_DefaultFrameWidth, option, this);

    option->midLineWidth = 0;

    option->state |= QStyle::State_Sunken;

    if (m_lineEdit->isReadOnly())

        option->state |= QStyle::State_ReadOnly;

#ifdef QT_KEYPAD_NAVIGATION

    if (hasEditFocus())

        option->state |= QStyle::State_HasEditFocus;

#endif

    option->features = QStyleOptionFrameV2::None;

}

QSize ExLineEdit::sizeHint() const

{

    m_lineEdit->setFrame(true);

    QSize size = m_lineEdit->sizeHint();

    m_lineEdit->setFrame(false);

    return size;

}

void ExLineEdit::focusInEvent(QFocusEvent *event)

{

    m_lineEdit->event(event);

    QWidget::focusInEvent(event);

}

void ExLineEdit::focusOutEvent(QFocusEvent *event)

{

    m_lineEdit->event(event);

    if (m_lineEdit->completer()) {

        connect(m_lineEdit->completer(), SIGNAL(activated(QString)),

                         m_lineEdit, SLOT(setText(QString)));

        connect(m_lineEdit->completer(), SIGNAL(highlighted(QString)),

                         m_lineEdit, SLOT(_q_completionHighlighted(QString)));

    }

    QWidget::focusOutEvent(event);

}

void ExLineEdit::keyPressEvent(QKeyEvent *event)

{

    m_lineEdit->event(event);

}

bool ExLineEdit::event(QEvent *event)

{

    if (event->type() == QEvent::ShortcutOverride)

        return m_lineEdit->event(event);

    return QWidget::event(event);

}

void ExLineEdit::paintEvent(QPaintEvent *)

{

    QPainter p(this);

    QStyleOptionFrameV2 panel;

    initStyleOption(&panel);

    style()->drawPrimitive(QStyle::PE_PanelLineEdit, &panel, &p, this);

}

QVariant ExLineEdit::inputMethodQuery(Qt::InputMethodQuery property) const

{

    return m_lineEdit->inputMethodQuery(property);

}

void ExLineEdit::inputMethodEvent(QInputMethodEvent *e)

{

    m_lineEdit->event(e);

}

class UrlIconLabel : public QLabel

{

public:

    UrlIconLabel(QWidget *parent);

    WebView *m_webView;

protected:

    void mousePressEvent(QMouseEvent *event);

    void mouseMoveEvent(QMouseEvent *event);

private:

    QPoint m_dragStartPos;

};

UrlIconLabel::UrlIconLabel(QWidget *parent)

    : QLabel(parent)

    , m_webView(0)

{

    setMinimumWidth(16);

    setMinimumHeight(16);

}

void UrlIconLabel::mousePressEvent(QMouseEvent *event)

{

    if (event->button() == Qt::LeftButton)

        m_dragStartPos = event->pos();

    QLabel::mousePressEvent(event);

}

void UrlIconLabel::mouseMoveEvent(QMouseEvent *event)

{

    if (event->buttons() == Qt::LeftButton

        && (event->pos() - m_dragStartPos).manhattanLength() > QApplication::startDragDistance()

         && m_webView) {

        QDrag *drag = new QDrag(this);

        QMimeData *mimeData = new QMimeData;

        mimeData->setText(QString::fromUtf8(m_webView->url().toEncoded()));

        QList<QUrl> urls;

        urls.append(m_webView->url());

        mimeData->setUrls(urls);

        drag->setMimeData(mimeData);

        drag->exec();

    }

}

UrlLineEdit::UrlLineEdit(QWidget *parent)

    : ExLineEdit(parent)

    , m_webView(0)

    , m_iconLabel(0)

{

    // icon

    m_iconLabel = new UrlIconLabel(this);

    m_iconLabel->resize(16, 16);

    setLeftWidget(m_iconLabel);

    m_defaultBaseColor = palette().color(QPalette::Base);

    webViewIconChanged();

}

void UrlLineEdit::setWebView(WebView *webView)

{

    Q_ASSERT(!m_webView);

    m_webView = webView;

    m_iconLabel->m_webView = webView;

    connect(webView, SIGNAL(urlChanged(QUrl)),

        this, SLOT(webViewUrlChanged(QUrl)));

    connect(webView, SIGNAL(loadFinished(bool)),

        this, SLOT(webViewIconChanged()));

    connect(webView, SIGNAL(iconChanged()),

        this, SLOT(webViewIconChanged()));

    connect(webView, SIGNAL(loadProgress(int)),

        this, SLOT(update()));

}

void UrlLineEdit::webViewUrlChanged(const QUrl &url)

{

    m_lineEdit->setText(QString::fromUtf8(url.toEncoded()));

    m_lineEdit->setCursorPosition(0);

}

void UrlLineEdit::webViewIconChanged()

{

    QUrl url = (m_webView)  ? m_webView->url() : QUrl();

    QIcon icon = BrowserApplication::instance()->icon(url);

    QPixmap pixmap(icon.pixmap(16, 16));

    m_iconLabel->setPixmap(pixmap);

}

QLinearGradient UrlLineEdit::generateGradient(const QColor &color) const

{

    QLinearGradient gradient(0, 0, 0, height());

    gradient.setColorAt(0, m_defaultBaseColor);

    gradient.setColorAt(0.15, color.lighter(120));

    gradient.setColorAt(0.5, color);

    gradient.setColorAt(0.85, color.lighter(120));

    gradient.setColorAt(1, m_defaultBaseColor);

    return gradient;

}

void UrlLineEdit::focusOutEvent(QFocusEvent *event)

{

    if (m_lineEdit->text().isEmpty() && m_webView)

        m_lineEdit->setText(QString::fromUtf8(m_webView->url().toEncoded()));

    ExLineEdit::focusOutEvent(event);

}

void UrlLineEdit::paintEvent(QPaintEvent *event)

{

    QPalette p = palette();

    if (m_webView && m_webView->url().scheme() == QLatin1String("https")) {

        QColor lightYellow(248, 248, 210);

        p.setBrush(QPalette::Base, generateGradient(lightYellow));

    } else {

        p.setBrush(QPalette::Base, m_defaultBaseColor);

    }

    setPalette(p);

    ExLineEdit::paintEvent(event);

    QPainter painter(this);

    QStyleOptionFrameV2 panel;

    initStyleOption(&panel);

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

    if (m_webView && !hasFocus()) {

        int progress = m_webView->progress();

        QColor loadingColor = QColor(116, 192, 250);

        painter.setBrush(generateGradient(loadingColor));

        painter.setPen(Qt::transparent);

        int mid = backgroundRect.width() / 100 * progress;

        QRect progressRect(backgroundRect.x(), backgroundRect.y(), mid, backgroundRect.height());

        painter.drawRect(progressRect);

    }

}