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

**

** Copyright (C) 2009 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 "qtoolbox.h"

#ifndef QT_NO_TOOLBOX

#include <qapplication.h>

#include <qeventloop.h>

#include <qlayout.h>

#include <qlist.h>

#include <qpainter.h>

#include <qscrollarea.h>

#include <qstyle.h>

#include <qstyleoption.h>

#include <qtooltip.h>

#include <qabstractbutton.h>

#include "qframe_p.h"

QT_BEGIN_NAMESPACE

class QToolBoxButton : public QAbstractButton

{

    Q_OBJECT

public:

    QToolBoxButton(QWidget *parent)

        : QAbstractButton(parent), selected(false), indexInPage(-1)

    {

        setBackgroundRole(QPalette::Window);

        setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Minimum);

        setFocusPolicy(Qt::NoFocus);

    }

    inline void setSelected(bool b) { selected = b; update(); }

    inline void setIndex(int newIndex) { indexInPage = newIndex; }

    QSize sizeHint() const;

    QSize minimumSizeHint() const;

protected:

    void initStyleOption(QStyleOptionToolBox *opt) const;

    void paintEvent(QPaintEvent *);

private:

    bool selected;

    int indexInPage;

};

class QToolBoxPrivate : public QFramePrivate

{

    Q_DECLARE_PUBLIC(QToolBox)

public:

    struct Page

    {

        QToolBoxButton *button;

        QScrollArea *sv;

        QWidget *widget;

        inline void setText(const QString &text) { button->setText(text); }

        inline void setIcon(const QIcon &is) { button->setIcon(is); }

#ifndef QT_NO_TOOLTIP

        inline void setToolTip(const QString &tip) { button->setToolTip(tip); }

        inline QString toolTip() const { return button->toolTip(); }

#endif

        inline QString text() const { return button->text(); }

        inline QIcon icon() const { return button->icon(); }

        inline bool operator==(const Page& other) const

        {

            return widget == other.widget;

        }

    };

    typedef QList<Page> PageList;

    inline QToolBoxPrivate()

        : currentPage(0)

    {

    }

    void _q_buttonClicked();

    void _q_widgetDestroyed(QObject*);

    Page *page(QWidget *widget) const;

    const Page *page(int index) const;

    Page *page(int index);

    void updateTabs();

    void relayout();

    PageList pageList;

    QVBoxLayout *layout;

    Page *currentPage;

};

QToolBoxPrivate::Page *QToolBoxPrivate::page(QWidget *widget) const

{

    if (!widget)

        return 0;

    for (PageList::ConstIterator i = pageList.constBegin(); i != pageList.constEnd(); ++i)

        if ((*i).widget == widget)

            return (Page*) &(*i);

    return 0;

}

QToolBoxPrivate::Page *QToolBoxPrivate::page(int index)

{

    if (index >= 0 && index < pageList.size())

        return &pageList[index];

    return 0;

}

const QToolBoxPrivate::Page *QToolBoxPrivate::page(int index) const

{

    if (index >= 0 && index < pageList.size())

        return &pageList.at(index);

    return 0;

}

void QToolBoxPrivate::updateTabs()

{

    QToolBoxButton *lastButton = currentPage ? currentPage->button : 0;

    bool after = false;

    int index = 0;

    for (index = 0; index < pageList.count(); ++index) {

        const Page &page = pageList.at(index);

        QToolBoxButton *tB = page.button;

        // update indexes, since the updates are delayed, the indexes will be correct

        // when we actually paint.

        tB->setIndex(index);

        QWidget *tW = page.widget;

        if (after) {

            QPalette p = tB->palette();

            p.setColor(tB->backgroundRole(), tW->palette().color(tW->backgroundRole()));

            tB->setPalette(p);

            tB->update();

        } else if (tB->backgroundRole() != QPalette::Window) {

            tB->setBackgroundRole(QPalette::Window);

            tB->update();

        }

        after = tB == lastButton;

    }

}

QSize QToolBoxButton::sizeHint() const

{

    QSize iconSize(8, 8);

    if (!icon().isNull()) {

        int icone = style()->pixelMetric(QStyle::PM_SmallIconSize, 0, parentWidget() /* QToolBox */);

        iconSize += QSize(icone + 2, icone);

    }

    QSize textSize = fontMetrics().size(Qt::TextShowMnemonic, text()) + QSize(0, 8);

    QSize total(iconSize.width() + textSize.width(), qMax(iconSize.height(), textSize.height()));

    return total.expandedTo(QApplication::globalStrut());

}

QSize QToolBoxButton::minimumSizeHint() const

{

    if (icon().isNull())

        return QSize();

    int icone = style()->pixelMetric(QStyle::PM_SmallIconSize, 0, parentWidget() /* QToolBox */);

    return QSize(icone + 8, icone + 8);

}

void QToolBoxButton::initStyleOption(QStyleOptionToolBox *option) const

{

    if (!option)

        return;

    option->initFrom(this);

    if (selected)

        option->state |= QStyle::State_Selected;

    if (isDown())

        option->state |= QStyle::State_Sunken;

    option->text = text();

    option->icon = icon();

    if (QStyleOptionToolBoxV2 *optionV2 = qstyleoption_cast<QStyleOptionToolBoxV2 *>(option)) {

        QToolBox *toolBox = static_cast<QToolBox *>(parentWidget()); // I know I'm in a tool box.

        int widgetCount = toolBox->count();

        int currIndex = toolBox->currentIndex();

        if (widgetCount == 1) {

            optionV2->position = QStyleOptionToolBoxV2::OnlyOneTab;

        } else if (indexInPage == 0) {

            optionV2->position = QStyleOptionToolBoxV2::Beginning;

        } else if (indexInPage == widgetCount - 1) {

            optionV2->position = QStyleOptionToolBoxV2::End;

        } else {

            optionV2->position = QStyleOptionToolBoxV2::Middle;

        }

        if (currIndex == indexInPage - 1) {

            optionV2->selectedPosition = QStyleOptionToolBoxV2::PreviousIsSelected;

        } else if (currIndex == indexInPage + 1) {

            optionV2->selectedPosition = QStyleOptionToolBoxV2::NextIsSelected;

        } else {

            optionV2->selectedPosition = QStyleOptionToolBoxV2::NotAdjacent;

        }

    }

}

void QToolBoxButton::paintEvent(QPaintEvent *)

{

    QPainter paint(this);

    QString text = QAbstractButton::text();

    QPainter *p = &paint;

    QStyleOptionToolBoxV2 opt;

    initStyleOption(&opt);

    style()->drawControl(QStyle::CE_ToolBoxTab, &opt, p, parentWidget());

}

/*!

    \class QToolBox

    \brief The QToolBox class provides a column of tabbed widget items.

    \ingroup basicwidgets

    A toolbox is a widget that displays a column of tabs one above the

    other, with the current item displayed below the current tab.

    Every tab has an index position within the column of tabs. A tab's

    item is a QWidget.

    Each item has an itemText(), an optional itemIcon(), an optional

    itemToolTip(), and a widget(). The item's attributes can be

    changed with setItemText(), setItemIcon(), and

    setItemToolTip(). Each item can be enabled or disabled

    individually with setItemEnabled().

    Items are added using addItem(), or inserted at particular

    positions using insertItem(). The total number of items is given

    by count(). Items can be deleted with delete, or removed from the

    toolbox with removeItem(). Combining removeItem() and insertItem()

    allows you to move items to different positions.

    The index of the current item widget is returned by currentIndex(),

    and set with setCurrentIndex(). The index of a particular item can

    be found using indexOf(), and the item at a given index is returned

    by item().

    The currentChanged() signal is emitted when the current item is

    changed.

    \sa QTabWidget

*/

/*!

    \fn void QToolBox::currentChanged(int index)

    This signal is emitted when the current item is changed. The new

    current item's index is passed in \a index, or -1 if there is no

    current item.

*/

#ifdef QT3_SUPPORT

/*!

    Constructs a toolbox called \a name with parent \a parent and flags \a f.

*/

QToolBox::QToolBox(QWidget *parent, const char *name, Qt::WindowFlags f)

    :  QFrame(*new QToolBoxPrivate, parent, f)

{

    Q_D(QToolBox);

    setObjectName(QString::fromAscii(name));

    d->layout = new QVBoxLayout(this);

    d->layout->setMargin(0);

    setBackgroundRole(QPalette::Button);

}

#endif

/*!

    Constructs a new toolbox with the given \a parent and the flags, \a f.

*/

QToolBox::QToolBox(QWidget *parent, Qt::WindowFlags f)

    :  QFrame(*new QToolBoxPrivate, parent, f)

{

    Q_D(QToolBox);

    d->layout = new QVBoxLayout(this);

    d->layout->setMargin(0);

    setBackgroundRole(QPalette::Button);

}

/*!

    Destroys the toolbox.

*/

QToolBox::~QToolBox()

{

}

/*!

    \fn int QToolBox::addItem(QWidget *w, const QString &text)

    \overload

    Adds the widget \a w in a new tab at bottom of the toolbox. The

    new tab's text is set to \a text. Returns the new tab's index.

*/

/*!

    \fn int QToolBox::addItem(QWidget *widget, const QIcon &iconSet,const QString &text)

    Adds the \a widget in a new tab at bottom of the toolbox. The

    new tab's text is set to \a text, and the \a iconSet is

    displayed to the left of the \a text.  Returns the new tab's index.

*/

/*!

    \fn int QToolBox::insertItem(int index, QWidget *widget, const QString &text)

    \overload

    Inserts the \a widget at position \a index, or at the bottom

    of the toolbox if \a index is out of range. The new item's text is

    set to \a text. Returns the new item's index.

*/

/*!

    Inserts the \a widget at position \a index, or at the bottom

    of the toolbox if \a index is out of range. The new item's text

    is set to \a text, and the \a icon is displayed to the left of

    the \a text. Returns the new item's index.

*/

int QToolBox::insertItem(int index, QWidget *widget, const QIcon &icon, const QString &text)

{

    if (!widget)

        return -1;

    Q_D(QToolBox);

    connect(widget, SIGNAL(destroyed(QObject*)), this, SLOT(_q_widgetDestroyed(QObject*)));

    QToolBoxPrivate::Page c;

    c.widget = widget;

    c.button = new QToolBoxButton(this);

    c.button->setObjectName(QLatin1String("qt_toolbox_toolboxbutton"));

    connect(c.button, SIGNAL(clicked()), this, SLOT(_q_buttonClicked()));

    c.sv = new QScrollArea(this);

    c.sv->setWidget(widget);

    c.sv->setWidgetResizable(true);

    c.sv->hide();

    c.sv->setFrameStyle(QFrame::NoFrame);

    c.setText(text);

    c.setIcon(icon);

    if (index < 0 || index >= (int)d->pageList.count()) {

        index = d->pageList.count();

        d->pageList.append(c);

        d->layout->addWidget(c.button);

        d->layout->addWidget(c.sv);

        if (index == 0)

            setCurrentIndex(index);

    } else {

        d->pageList.insert(index, c);

        d->relayout();

        if (d->currentPage) {

            QWidget *current = d->currentPage->widget;

            int oldindex = indexOf(current);

            if (index <= oldindex) {

                d->currentPage = 0; // trigger change

                setCurrentIndex(oldindex);

            }

        }

    }

    c.button->show();

    d->updateTabs();

    itemInserted(index);

    return index;

}

void QToolBoxPrivate::_q_buttonClicked()

{

    Q_Q(QToolBox);

    QToolBoxButton *tb = qobject_cast<QToolBoxButton*>(q->sender());

    QWidget* item = 0;

    for (QToolBoxPrivate::PageList::ConstIterator i = pageList.constBegin(); i != pageList.constEnd(); ++i)

        if ((*i).button == tb) {

            item = (*i).widget;

            break;

        }

    q->setCurrentIndex(q->indexOf(item));

}

/*!

    \property QToolBox::count

    \brief The number of items contained in the toolbox.

    By default, this property has a value of 0.

*/

int QToolBox::count() const

{

    Q_D(const QToolBox);

    return d->pageList.count();

}

void QToolBox::setCurrentIndex(int index)

{

    Q_D(QToolBox);

    QToolBoxPrivate::Page *c = d->page(index);

    if (!c || d->currentPage == c)

        return;

    c->button->setSelected(true);

    if (d->currentPage) {

        d->currentPage->sv->hide();

        d->currentPage->button->setSelected(false);

    }

    d->currentPage = c;

    d->currentPage->sv->show();

    d->updateTabs();

    emit currentChanged(index);

}

void QToolBoxPrivate::relayout()

{

    Q_Q(QToolBox);

    delete layout;

    layout = new QVBoxLayout(q);

    layout->setMargin(0);

    for (QToolBoxPrivate::PageList::ConstIterator i = pageList.constBegin(); i != pageList.constEnd(); ++i) {

        layout->addWidget((*i).button);

        layout->addWidget((*i).sv);

    }

}

void QToolBoxPrivate::_q_widgetDestroyed(QObject *object)

{

    Q_Q(QToolBox);

    // no verification - vtbl corrupted already

    QWidget *p = (QWidget*)object;

    QToolBoxPrivate::Page *c = page(p);

    if (!p || !c)

        return;

    layout->removeWidget(c->sv);

    layout->removeWidget(c->button);

    c->sv->deleteLater(); // page might still be a child of sv

    delete c->button;

    bool removeCurrent = c == currentPage;

    pageList.removeAll(*c);

    if (!pageList.count()) {

        currentPage = 0;

        emit q->currentChanged(-1);

    } else if (removeCurrent) {

        currentPage = 0;

        q->setCurrentIndex(0);

    }

}

/*!

    Removes the item at position \a index from the toolbox. Note that

    the widget is \e not deleted.

*/

void QToolBox::removeItem(int index)

{

    Q_D(QToolBox);

    if (QWidget *w = widget(index)) {

        disconnect(w, SIGNAL(destroyed(QObject*)), this, SLOT(_q_widgetDestroyed(QObject*)));

        w->setParent(this);

        // destroy internal data

        d->_q_widgetDestroyed(w);

        itemRemoved(index);

    }

}

/*!

    \property QToolBox::currentIndex

    \brief the index of the current item

    By default, for an empty toolbox, this property has a value of -1.

    \sa indexOf(), widget()

*/

int QToolBox::currentIndex() const

{

    Q_D(const QToolBox);

    return d->currentPage ? indexOf(d->currentPage->widget) : -1;

}

/*!