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+/****************************************************************************
+**
+** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
+** All rights reserved.
+** Contact: Nokia Corporation (qt-info@nokia.com)
+**
+** This file is part of the QtGui module 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 Technology Preview License Agreement accompanying
+** this package.
+**
+** 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 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** If you have questions regarding the use of this file, please contact
+** Nokia at qt-info@nokia.com.
+**
+**
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+#include "qcommandlinkbutton.h"
+#include "qstylepainter.h"
+#include "qstyleoption.h"
+#include "qtextdocument.h"
+#include "qtextlayout.h"
+#include "qcolor.h"
+#include "qfont.h"
+#include <qmath.h>
+
+#include "private/qpushbutton_p.h"
+
+QT_BEGIN_NAMESPACE
+
+/*!
+    \class QCommandLinkButton
+    \since 4.4
+    \brief The QCommandLinkButton widget provides a Vista style command link button.
+
+    \ingroup basicwidgets
+
+
+    The command link is a new control that was introduced by Windows Vista. It's
+    intended use is similar to that of a radio button in that it is used to choose
+    between a set of mutually exclusive options. Command link buttons should not
+    be used by themselves but rather as an alternative to radio buttons in
+    Wizards and dialogs and makes pressing the "next" button redundant.
+    The appearance is generally similar to that of a flat pushbutton, but
+    it allows for a descriptive text in addition to the normal button text.
+    By default it will also carry an arrow icon, indicating that pressing the
+    control will open another window or page.
+
+    \sa QPushButton QRadioButton
+*/
+
+/*!
+    \property QCommandLinkButton::description
+    \brief A descriptive label to complement the button text
+
+    Setting this property will set a descriptive text on the
+    button, complementing the text label. This will usually
+    be displayed in a smaller font than the primary text.
+*/
+
+/*!
+    \property QCommandLinkButton::flat
+    \brief This property determines whether the button is displayed as a flat
+    panel or with a border.
+
+    By default, this property is set to false.
+
+    \sa QPushButton::flat
+*/
+
+class QCommandLinkButtonPrivate : public QPushButtonPrivate
+{
+    Q_DECLARE_PUBLIC(QCommandLinkButton)
+
+public:
+    QCommandLinkButtonPrivate()
+        : QPushButtonPrivate(){}
+
+    void init();
+    qreal titleSize() const;
+    bool usingVistaStyle() const;
+
+    QFont titleFont() const;
+    QFont descriptionFont() const;
+
+    QRect titleRect() const;
+    QRect descriptionRect() const;
+
+    int textOffset() const;
+    int descriptionOffset() const;
+    int descriptionHeight(int width) const;
+    QColor mergedColors(const QColor &a, const QColor &b, int value) const;
+
+    int topMargin() const { return 10; }
+    int leftMargin() const { return 7; }
+    int rightMargin() const { return 4; }
+    int bottomMargin() const { return 10; }
+
+    QString description;
+    QColor currentColor;
+};
+
+// Mix colors a and b with a ratio in the range [0-255]
+QColor QCommandLinkButtonPrivate::mergedColors(const QColor &a, const QColor &b, int value = 50) const
+{
+    Q_ASSERT(value >= 0);
+    Q_ASSERT(value <= 255);
+    QColor tmp = a;
+    tmp.setRed((tmp.red() * value) / 255 + (b.red() * (255 - value)) / 255);
+    tmp.setGreen((tmp.green() * value) / 255 + (b.green() * (255 - value)) / 255);
+    tmp.setBlue((tmp.blue() * value) / 255 + (b.blue() * (255 - value)) / 255);
+    return tmp;
+}
+
+QFont QCommandLinkButtonPrivate::titleFont() const
+{
+    Q_Q(const QCommandLinkButton);
+    QFont font = q->font();
+    if (usingVistaStyle()) {
+        font.setPointSizeF(12.0);
+    } else {
+        font.setBold(true);
+        font.setPointSizeF(9.0);
+    }
+
+    // Note the font will be resolved against
+    // QPainters font, so we need to restore the mask
+    int resolve_mask = font.resolve_mask;
+    QFont modifiedFont = q->font().resolve(font);
+    modifiedFont.detach();
+    modifiedFont.resolve_mask = resolve_mask;
+    return modifiedFont;
+}
+
+QFont QCommandLinkButtonPrivate::descriptionFont() const
+{
+    Q_Q(const QCommandLinkButton);
+    QFont font = q->font();
+    font.setPointSizeF(9.0);
+
+    // Note the font will be resolved against
+    // QPainters font, so we need to restore the mask
+    int resolve_mask = font.resolve_mask;
+    QFont modifiedFont = q->font().resolve(font);
+    modifiedFont.detach();
+    modifiedFont.resolve_mask = resolve_mask;
+    return modifiedFont;
+}
+
+QRect QCommandLinkButtonPrivate::titleRect() const
+{
+    Q_Q(const QCommandLinkButton);
+    QRect r = q->rect().adjusted(textOffset(), topMargin(), -rightMargin(), 0);
+    if (description.isEmpty())
+    {
+        QFontMetrics fm(titleFont());
+        r.setTop(r.top() + qMax(0, (q->icon().actualSize(q->iconSize()).height()
+                 - fm.height()) / 2));
+    }
+
+    return r;
+}
+
+QRect QCommandLinkButtonPrivate::descriptionRect() const
+{
+    Q_Q(const QCommandLinkButton);
+    return q->rect().adjusted(textOffset(), descriptionOffset(),
+                              -rightMargin(), -bottomMargin());
+}
+
+int QCommandLinkButtonPrivate::textOffset() const
+{
+    Q_Q(const QCommandLinkButton);
+    return q->icon().actualSize(q->iconSize()).width() + leftMargin() + 6;
+}
+
+int QCommandLinkButtonPrivate::descriptionOffset() const
+{
+    QFontMetrics fm(titleFont());
+    return topMargin() + fm.height();
+}
+
+bool QCommandLinkButtonPrivate::usingVistaStyle() const
+{
+    Q_Q(const QCommandLinkButton);
+    //### This is a hack to detect if we are indeed running Vista style themed and not in classic
+    // When we add api to query for this, we should change this implementation to use it.
+    return q->style()->inherits("QWindowsVistaStyle")
+        && !q->style()->pixelMetric(QStyle::PM_ButtonShiftHorizontal);
+}
+
+void QCommandLinkButtonPrivate::init()
+{
+    Q_Q(QCommandLinkButton);
+    QPushButtonPrivate::init();
+    q->setAttribute(Qt::WA_Hover);
+
+    QSizePolicy policy(QSizePolicy::Preferred, QSizePolicy::Preferred, QSizePolicy::PushButton);
+    policy.setHeightForWidth(true);
+    q->setSizePolicy(policy);
+
+    q->setIconSize(QSize(20, 20));
+    QStyleOptionButton opt;
+    q->initStyleOption(&opt);
+    q->setIcon(q->style()->standardIcon(QStyle::SP_CommandLink, &opt));
+}
+
+// Calculates the height of the description text based on widget width
+int QCommandLinkButtonPrivate::descriptionHeight(int widgetWidth) const
+{
+    // Calc width of actual paragraph
+    int lineWidth = widgetWidth - textOffset() - rightMargin();
+
+    qreal descriptionheight = 0;
+    if (!description.isEmpty()) {
+        QTextLayout layout(description);
+        layout.setFont(descriptionFont());
+        layout.beginLayout();
+        while (true) {
+            QTextLine line = layout.createLine();
+            if (!line.isValid())
+                break;
+            line.setLineWidth(lineWidth);
+            line.setPosition(QPointF(0, descriptionheight));
+            descriptionheight += line.height();
+        }
+        layout.endLayout();
+    }
+    return qCeil(descriptionheight);
+}
+
+/*!
+    \reimp
+ */
+QSize QCommandLinkButton::minimumSizeHint() const
+{
+    Q_D(const QCommandLinkButton);
+    QSize size = sizeHint();
+    int minimumHeight = qMax(d->descriptionOffset() + d->bottomMargin(),
+                             icon().actualSize(iconSize()).height() + d->topMargin());
+    size.setHeight(minimumHeight);
+    return size;
+}
+
+/*!
+    Constructs a command link with no text and a \a parent.
+*/
+
+QCommandLinkButton::QCommandLinkButton(QWidget *parent)
+: QPushButton(*new QCommandLinkButtonPrivate, parent)
+{
+    Q_D(QCommandLinkButton);
+    d->init();
+}
+
+/*!
+    Constructs a command link with the parent \a parent and the text \a
+    text.
+*/
+
+QCommandLinkButton::QCommandLinkButton(const QString &text, QWidget *parent)
+    : QPushButton(*new QCommandLinkButtonPrivate, parent)
+{
+    Q_D(QCommandLinkButton);
+    setText(text);
+    d->init();
+}
+
+/*!
+    Constructs a command link with a \a text, a \a description, and a \a parent.
+*/
+QCommandLinkButton::QCommandLinkButton(const QString &text, const QString &description, QWidget *parent)
+    : QPushButton(*new QCommandLinkButtonPrivate, parent)
+{
+    Q_D(QCommandLinkButton);
+    setText(text);
+    setDescription(description);
+    d->init();
+}
+
+/*! \reimp */
+bool QCommandLinkButton::event(QEvent *e)
+{
+    return QPushButton::event(e);
+}
+
+/*! \reimp */
+QSize QCommandLinkButton::sizeHint() const
+{
+//  Standard size hints from UI specs
+//  Without note: 135, 41
+//  With note: 135, 60
+    Q_D(const QCommandLinkButton);
+
+    QSize size = QPushButton::sizeHint();
+    QFontMetrics fm(d->titleFont());
+    int textWidth = qMax(fm.width(text()), 135);
+    int buttonWidth = textWidth + d->textOffset() + d->rightMargin();
+    int heightWithoutDescription = d->descriptionOffset() + d->bottomMargin();
+
+    size.setWidth(qMax(size.width(), buttonWidth));
+    size.setHeight(qMax(d->description.isEmpty() ? 41 : 60,
+                        heightWithoutDescription + d->descriptionHeight(buttonWidth)));
+    return size;
+}
+
+/*! \reimp */
+int QCommandLinkButton::heightForWidth(int width) const
+{
+    Q_D(const QCommandLinkButton);
+    int heightWithoutDescription = d->descriptionOffset() + d->bottomMargin();
+    // find the width available for the description area
+    return qMax(heightWithoutDescription + d->descriptionHeight(width),
+                icon().actualSize(iconSize()).height() + d->topMargin() +
+                d->bottomMargin());
+}
+
+/*! \reimp */
+void QCommandLinkButton::paintEvent(QPaintEvent *)
+{
+    Q_D(QCommandLinkButton);
+    QStylePainter p(this);
+    p.save();
+
+    QStyleOptionButton option;
+    initStyleOption(&option);
+
+    //Enable command link appearance on Vista
+    option.features |= QStyleOptionButton::CommandLinkButton;
+    option.text = QString();
+    option.icon = QIcon(); //we draw this ourselves
+    QSize pixmapSize = icon().actualSize(iconSize());
+
+    int vOffset = isDown() ? style()->pixelMetric(QStyle::PM_ButtonShiftVertical) : 0;
+    int hOffset = isDown() ? style()->pixelMetric(QStyle::PM_ButtonShiftHorizontal) : 0;
+
+    //Draw icon
+    p.drawControl(QStyle::CE_PushButton, option);
+    if (!icon().isNull())
+        p.drawPixmap(d->leftMargin() + hOffset, d->topMargin() + vOffset,
+        icon().pixmap(pixmapSize, isEnabled() ? QIcon::Normal : QIcon::Disabled,
+                                  isChecked() ? QIcon::On : QIcon::Off));
+
+    //Draw title
+    QColor textColor = palette().buttonText().color();
+    if (isEnabled() && d->usingVistaStyle()) {
+        textColor = QColor(21, 28, 85);
+        if (underMouse() && !isDown())
+            textColor = QColor(7, 64, 229);
+        //A simple text color transition
+        d->currentColor = d->mergedColors(textColor, d->currentColor, 60);
+        option.palette.setColor(QPalette::ButtonText, d->currentColor);
+    }
+
+    int textflags = Qt::TextShowMnemonic;
+    if (!style()->styleHint(QStyle::SH_UnderlineShortcut, &option, this))
+        textflags |= Qt::TextHideMnemonic;
+
+    p.setFont(d->titleFont());
+    p.drawItemText(d->titleRect().translated(hOffset, vOffset),
+                    textflags, option.palette, isEnabled(), text(), QPalette::ButtonText);
+
+    //Draw description
+    textflags |= Qt::TextWordWrap | Qt::ElideRight;
+    p.setFont(d->descriptionFont());
+    p.drawItemText(d->descriptionRect().translated(hOffset, vOffset), textflags,
+                    option.palette, isEnabled(), description(), QPalette::ButtonText);
+    p.restore();
+}
+
+void QCommandLinkButton::setDescription(const QString &description)
+{
+    Q_D(QCommandLinkButton);
+    d->description = description;
+    updateGeometry();
+    update();
+}
+
+QString QCommandLinkButton::description() const
+{
+    Q_D(const QCommandLinkButton);
+    return d->description;
+}
+
+QT_END_NAMESPACE
+