falkon/src/lib/3rdparty/fancytabwidget.cpp

/**************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
**
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**
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**
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** accordance with the Qt Commercial License Agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
** a written agreement between you and Nokia.
**
** GNU Lesser General Public License Usage
**
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** 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.
**
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#include "fancytabwidget.h"
#include "stylehelper.h"

#include <QDebug>

#include <QAnimationGroup>
#include <QColorDialog>
#include <QHBoxLayout>
#include <QMenu>
#include <QMouseEvent>
#include <QPainter>
#include <QSignalMapper>
#include <QSplitter>
#include <QStackedLayout>
#include <QStyleOptionTabV3>
#include <QToolButton>
#include <QToolTip>
#include <QVBoxLayout>
#include <QWindowsStyle>

using namespace Core;
using namespace Internal;

const int FancyTabBar::m_rounding = 22;
const int FancyTabBar::m_textPadding = 4;

void FancyTabProxyStyle::drawControl(
    ControlElement element, const QStyleOption* option,
    QPainter* p, const QWidget* widget) const
{

    const QStyleOptionTabV3* v_opt = qstyleoption_cast<const QStyleOptionTabV3*>(option);

    if (element != CE_TabBarTab || !v_opt) {
        QProxyStyle::drawControl(element, option, p, widget);
        return;
    }

    const QRect rect = v_opt->rect;
    const bool selected = v_opt->state & State_Selected;
    const bool vertical_tabs = v_opt->shape == QTabBar::RoundedWest;
    const QString text = v_opt->text;

    if (selected) {
        //background
        p->save();
        QLinearGradient grad(rect.topLeft(), rect.topRight());
        grad.setColorAt(0, QColor(255, 255, 255, 140));
        grad.setColorAt(1, QColor(255, 255, 255, 210));
        p->fillRect(rect.adjusted(0, 0, 0, -1), grad);
        p->restore();

        //shadows
        p->setPen(QColor(0, 0, 0, 110));
        p->drawLine(rect.topLeft() + QPoint(1, -1), rect.topRight() - QPoint(0, 1));
        p->drawLine(rect.bottomLeft(), rect.bottomRight());
        p->setPen(QColor(0, 0, 0, 40));
        p->drawLine(rect.topLeft(), rect.bottomLeft());

        //highlights
        p->setPen(QColor(255, 255, 255, 50));
        p->drawLine(rect.topLeft() + QPoint(0, -2), rect.topRight() - QPoint(0, 2));
        p->drawLine(rect.bottomLeft() + QPoint(0, 1), rect.bottomRight() + QPoint(0, 1));
        p->setPen(QColor(255, 255, 255, 40));
        p->drawLine(rect.topLeft() + QPoint(0, 0), rect.topRight());
        p->drawLine(rect.topRight() + QPoint(0, 1), rect.bottomRight() - QPoint(0, 1));
        p->drawLine(rect.bottomLeft() + QPoint(0, -1), rect.bottomRight() - QPoint(0, 1));
    }

    QTransform m;
    if (vertical_tabs) {
        m = QTransform::fromTranslate(rect.left(), rect.bottom());
        m.rotate(-90);
    }
    else {
        m = QTransform::fromTranslate(rect.left(), rect.top());
    }

    const QRect draw_rect(QPoint(0, 0), m.mapRect(rect).size());

    p->save();
    p->setTransform(m);

    QRect icon_rect(QPoint(8, 0), v_opt->iconSize);
    QRect text_rect(icon_rect.topRight() + QPoint(4, 0), draw_rect.size());
    text_rect.setRight(draw_rect.width());
    icon_rect.translate(0, (draw_rect.height() - icon_rect.height()) / 2);

    QFont boldFont(p->font());
    boldFont.setPointSizeF(Utils::StyleHelper::sidebarFontSize());
    boldFont.setBold(true);
    p->setFont(boldFont);
    p->setPen(selected ? QColor(255, 255, 255, 160) : QColor(0, 0, 0, 110));
    int textFlags = Qt::AlignHCenter | Qt::AlignVCenter;
    p->drawText(text_rect, textFlags, text);
    p->setPen(selected ? QColor(60, 60, 60) : Utils::StyleHelper::panelTextColor());
#if 0
    if (widget) {
        const QString fader_key = "tab_" + text + "_fader";
        const QString animation_key = "tab_" + text + "_animation";

        const QString tab_hover = widget->property("tab_hover").toString();
        int fader = widget->property(fader_key.toUtf8().constData()).toInt();
        QPropertyAnimation* animation = widget->property(animation_key.toUtf8().constData()).value<QPropertyAnimation*>();

        if (!animation) {
            QWidget* mut_widget = const_cast<QWidget*>(widget);
            fader = 0;
            mut_widget->setProperty(fader_key.toUtf8().constData(), fader);
            animation = new QPropertyAnimation(mut_widget, fader_key.toUtf8(), mut_widget);
            connect(animation, SIGNAL(valueChanged(QVariant)), mut_widget, SLOT(update()));
            mut_widget->setProperty(animation_key.toUtf8().constData(), QVariant::fromValue(animation));
        }

        if (text == tab_hover) {
            if (animation->state() != QAbstractAnimation::Running && fader != 40) {
                animation->stop();
                animation->setDuration(80);
                animation->setEndValue(40);
                animation->start();
            }
        }
        else {
            if (animation->state() != QAbstractAnimation::Running && fader != 0) {
                animation->stop();
                animation->setDuration(160);
                animation->setEndValue(0);
                animation->start();
            }
        }

        if (!selected) {
            p->save();
            QLinearGradient grad(draw_rect.topLeft(), vertical_tabs ? draw_rect.bottomLeft() : draw_rect.topRight());
            grad.setColorAt(0, Qt::transparent);
            grad.setColorAt(0.5, QColor(255, 255, 255, fader));
            grad.setColorAt(1, Qt::transparent);
            p->fillRect(draw_rect, grad);
            p->setPen(QPen(grad, 1.0));
            p->drawLine(draw_rect.topLeft(), vertical_tabs ? draw_rect.bottomLeft() : draw_rect.topRight());
            p->drawLine(draw_rect.bottomRight(), vertical_tabs ? draw_rect.topRight() : draw_rect.bottomLeft());
            p->restore();
        }
    }
#endif

    Utils::StyleHelper::drawIconWithShadow(v_opt->icon, icon_rect, p, QIcon::Normal);

    p->drawText(text_rect.translated(0, -1), textFlags, text);

    p->restore();
}

void FancyTabProxyStyle::polish(QWidget* widget)
{
    if (QString(widget->metaObject()->className()) == "QTabBar") {
        widget->setMouseTracking(true);
        widget->installEventFilter(this);
    }
    QProxyStyle::polish(widget);
}

void FancyTabProxyStyle::polish(QApplication* app)
{
    QProxyStyle::polish(app);
}

void FancyTabProxyStyle::polish(QPalette &palette)
{
    QProxyStyle::polish(palette);
}

bool FancyTabProxyStyle::eventFilter(QObject* o, QEvent* e)
{
    QTabBar* bar = qobject_cast<QTabBar*>(o);
    if (bar && (e->type() == QEvent::MouseMove || e->type() == QEvent::Leave)) {
        QMouseEvent* event = static_cast<QMouseEvent*>(e);
        const QString old_hovered_tab = bar->property("tab_hover").toString();
        const QString hovered_tab = e->type() == QEvent::Leave ? QString() : bar->tabText(bar->tabAt(event->pos()));
        bar->setProperty("tab_hover", hovered_tab);

        if (old_hovered_tab != hovered_tab) {
            bar->update();
        }
    }

    return false;
}

FancyTab::FancyTab(QWidget* tabbar)
    : QWidget(tabbar), tabbar(tabbar), m_fader(0)
{
//    animator.setPropertyName("fader");
//    animator.setTargetObject(this);
    setSizePolicy(QSizePolicy::Expanding, QSizePolicy::Maximum);
}

void FancyTab::fadeIn()
{
//    animator.stop();
//    animator.setDuration(80);
//    animator.setEndValue(40);
//    animator.start();
}

void FancyTab::fadeOut()
{
//    animator.stop();
//    animator.setDuration(160);
//    animator.setEndValue(0);
//    animator.start();
}

void FancyTab::setFader(float value)
{
    m_fader = value;
    tabbar->update();
}

FancyTabBar::FancyTabBar(QWidget* parent)
    : QWidget(parent)
{
    setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Expanding);
    setStyle(new QWindowsStyle);
    setMinimumWidth(qMax(2 * m_rounding, 40));
    setAttribute(Qt::WA_Hover, true);
    setFocusPolicy(Qt::NoFocus);
    setMouseTracking(true); // Needed for hover events
    m_triggerTimer.setSingleShot(true);

    QVBoxLayout* layout = new QVBoxLayout;
    layout->addSpacerItem(new QSpacerItem(0, 0, QSizePolicy::Fixed, QSizePolicy::Expanding));
    layout->setSpacing(0);
    layout->setContentsMargins(0, 0, 0, 0);
    setLayout(layout);

    // We use a zerotimer to keep the sidebar responsive
    connect(&m_triggerTimer, SIGNAL(timeout()), this, SLOT(emitCurrentIndex()));
}

FancyTabBar::~FancyTabBar()
{
    delete style();
}

QSize FancyTab::sizeHint() const
{
    QFont boldFont(font());
    boldFont.setPointSizeF(Utils::StyleHelper::sidebarFontSize());
    boldFont.setBold(true);
    QFontMetrics fm(boldFont);
    int spacing = 8;
    int width = 60 + spacing + 2;
    int iconHeight = 32;
    QSize ret(width, iconHeight + spacing + fm.height());
    return ret;
}

QSize FancyTabBar::tabSizeHint(bool minimum) const
{
    QFont boldFont(font());
    boldFont.setPointSizeF(Utils::StyleHelper::sidebarFontSize());
    boldFont.setBold(true);
    QFontMetrics fm(boldFont);
    int spacing = 8;
    int width = 60 + spacing + 2;
    int iconHeight = minimum ? 0 : 32;
    return QSize(width, iconHeight + spacing + fm.height());
}

void FancyTabBar::paintEvent(QPaintEvent* event)
{
    Q_UNUSED(event)
    QPainter p(this);

    for (int i = 0; i < count(); ++i)
        if (i != currentIndex()) {
            paintTab(&p, i);
        }

    // paint active tab last, since it overlaps the neighbors
    if (currentIndex() != -1) {
        paintTab(&p, currentIndex());
    }
}

void FancyTab::enterEvent(QEvent*)
{
    fadeIn();
}

void FancyTab::leaveEvent(QEvent*)
{
    fadeOut();
}

QSize FancyTabBar::sizeHint() const
{
    QSize sh = tabSizeHint();
    return QSize(sh.width(), sh.height() * m_tabs.count());
}

QSize FancyTabBar::minimumSizeHint() const
{
    QSize sh = tabSizeHint(true);
    return QSize(sh.width(), sh.height() * m_tabs.count());
}

QRect FancyTabBar::tabRect(int index) const
{
    return m_tabs[index]->geometry();
}

QString FancyTabBar::tabToolTip(int index) const
{
    return m_tabs[index]->toolTip();
}

void FancyTabBar::setTabToolTip(int index, const QString &toolTip)
{
    m_tabs[index]->setToolTip(toolTip);
}

// This keeps the sidebar responsive since
// we get a repaint before loading the
// mode itself
void FancyTabBar::emitCurrentIndex()
{
    emit currentChanged(m_currentIndex);
}

void FancyTabBar::mousePressEvent(QMouseEvent* e)
{
    e->accept();
    for (int index = 0; index < m_tabs.count(); ++index) {
        if (tabRect(index).contains(e->pos())) {
            m_currentIndex = index;
            update();
            m_triggerTimer.start(0);
            break;
        }
    }
}

void FancyTabBar::addTab(const QIcon &icon, const QString &label)
{
    FancyTab* tab = new FancyTab(this);
    tab->icon = icon;
    tab->text = label;
    m_tabs.append(tab);
    qobject_cast<QVBoxLayout*>(layout())->insertWidget(layout()->count() - 1, tab);
}

void FancyTabBar::addSpacer(int size)
{
    qobject_cast<QVBoxLayout*>(layout())->insertSpacerItem(layout()->count() - 1,
            new QSpacerItem(0, size, QSizePolicy::Fixed, QSizePolicy::Maximum));
}

void FancyTabBar::paintTab(QPainter* painter, int tabIndex) const
{
    if (!validIndex(tabIndex)) {
        qWarning("invalid index");
        return;
    }
    painter->save();

    QRect rect = tabRect(tabIndex);
    bool selected = (tabIndex == m_currentIndex);

    if (selected) {
        //background
        painter->save();
        QLinearGradient grad(rect.topLeft(), rect.topRight());
        grad.setColorAt(0, QColor(255, 255, 255, 140));
        grad.setColorAt(1, QColor(255, 255, 255, 210));
        painter->fillRect(rect.adjusted(0, 0, 0, -1), grad);
        painter->restore();

        //shadows
        painter->setPen(QColor(0, 0, 0, 110));
        painter->drawLine(rect.topLeft() + QPoint(1, -1), rect.topRight() - QPoint(0, 1));
        painter->drawLine(rect.bottomLeft(), rect.bottomRight());
        painter->setPen(QColor(0, 0, 0, 40));
        painter->drawLine(rect.topLeft(), rect.bottomLeft());

        //highlights
        painter->setPen(QColor(255, 255, 255, 50));
        painter->drawLine(rect.topLeft() + QPoint(0, -2), rect.topRight() - QPoint(0, 2));
        painter->drawLine(rect.bottomLeft() + QPoint(0, 1), rect.bottomRight() + QPoint(0, 1));
        painter->setPen(QColor(255, 255, 255, 40));
        painter->drawLine(rect.topLeft() + QPoint(0, 0), rect.topRight());
        painter->drawLine(rect.topRight() + QPoint(0, 1), rect.bottomRight() - QPoint(0, 1));
        painter->drawLine(rect.bottomLeft() + QPoint(0, -1), rect.bottomRight() - QPoint(0, 1));
    }

    QString tabText(painter->fontMetrics().elidedText(this->tabText(tabIndex), Qt::ElideMiddle, width()));
    QRect tabTextRect(tabRect(tabIndex));
    QRect tabIconRect(tabTextRect);
    tabIconRect.adjust(+4, +4, -4, -4);
    tabTextRect.translate(0, -2);
    QFont boldFont(painter->font());
    boldFont.setPointSizeF(Utils::StyleHelper::sidebarFontSize());
    boldFont.setBold(true);
    painter->setFont(boldFont);
    painter->setPen(selected ? QColor(255, 255, 255, 160) : QColor(0, 0, 0, 110));
    int textFlags = Qt::AlignCenter | Qt::AlignBottom;
    painter->drawText(tabTextRect, textFlags, tabText);
    painter->setPen(selected ? QColor(60, 60, 60) : Utils::StyleHelper::panelTextColor());
#ifndef Q_WS_MAC
    if (!selected) {
        painter->save();
        int fader = int(m_tabs[tabIndex]->fader());
        QLinearGradient grad(rect.topLeft(), rect.topRight());
        grad.setColorAt(0, Qt::transparent);
        grad.setColorAt(0.5, QColor(255, 255, 255, fader));
        grad.setColorAt(1, Qt::transparent);
        painter->fillRect(rect, grad);
        painter->setPen(QPen(grad, 1.0));
        painter->drawLine(rect.topLeft(), rect.topRight());
        painter->drawLine(rect.bottomLeft(), rect.bottomRight());
        painter->restore();
    }
#endif

    const int textHeight = painter->fontMetrics().height();
    tabIconRect.adjust(0, 4, 0, -textHeight);
    Utils::StyleHelper::drawIconWithShadow(tabIcon(tabIndex), tabIconRect, painter, QIcon::Normal);

    painter->translate(0, -1);
    painter->drawText(tabTextRect, textFlags, tabText);
    painter->restore();
}

void FancyTabBar::setCurrentIndex(int index)
{
    m_currentIndex = index;
    update();
    emit currentChanged(m_currentIndex);
}


//////
// FancyColorButton
//////

class QT_QUPZILLA_EXPORT FancyColorButton : public QWidget
{
public:
    FancyColorButton(QWidget* parent)
        : m_parent(parent) {
        setSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::Preferred);
    }

    void mousePressEvent(QMouseEvent* ev) {
        if (ev->modifiers() & Qt::ShiftModifier) {
            Utils::StyleHelper::setBaseColor(QColorDialog::getColor(Utils::StyleHelper::requestedBaseColor(), m_parent));
        }
    }
private:
    QWidget* m_parent;
};

//////
// FancyTabWidget
//////

FancyTabWidget::FancyTabWidget(QWidget* parent)
    : QWidget(parent),
      mode_(Mode_None),
      tab_bar_(NULL),
      stack_(new QStackedLayout),
      side_widget_(new QWidget),
      side_layout_(new QVBoxLayout),
      top_layout_(new QVBoxLayout),
      use_background_(false),
      menu_(NULL),
      proxy_style_(new FancyTabProxyStyle)
{
    side_layout_->setSpacing(0);
    side_layout_->setMargin(0);
    side_layout_->addSpacerItem(new QSpacerItem(0, 0, QSizePolicy::Fixed, QSizePolicy::Expanding));

    side_widget_->setLayout(side_layout_);
    side_widget_->setSizePolicy(QSizePolicy::Fixed, QSizePolicy::Expanding);

    top_layout_->setMargin(0);
    top_layout_->setSpacing(0);
    top_layout_->addLayout(stack_);

    QHBoxLayout* main_layout = new QHBoxLayout;
    main_layout->setMargin(0);
    main_layout->setSpacing(1);
    main_layout->addWidget(side_widget_);
    main_layout->addLayout(top_layout_);
    setLayout(main_layout);
}

void FancyTabWidget::AddTab(QWidget* tab, const QIcon &icon, const QString &label)
{
    stack_->addWidget(tab);
    items_ << Item(icon, label);
}

void FancyTabWidget::AddSpacer(int size)
{
    items_ << Item(size);
}

void FancyTabWidget::SetBackgroundPixmap(const QPixmap &pixmap)
{
    background_pixmap_ = pixmap;
    update();
}

void FancyTabWidget::paintEvent(QPaintEvent*)
{
    if (!use_background_) {
        return;
    }

    QPainter painter(this);

    QRect rect = side_widget_->rect().adjusted(0, 0, 1, 0);
    rect = style()->visualRect(layoutDirection(), geometry(), rect);
    Utils::StyleHelper::verticalGradient(&painter, rect, rect);

    if (!background_pixmap_.isNull()) {
        QRect pixmap_rect(background_pixmap_.rect());
        pixmap_rect.moveTo(rect.topLeft());

        while (pixmap_rect.top() < rect.bottom()) {
            QRect source_rect(pixmap_rect.intersected(rect));
            source_rect.moveTo(0, 0);
            painter.drawPixmap(pixmap_rect.topLeft(), background_pixmap_, source_rect);
            pixmap_rect.moveTop(pixmap_rect.bottom() - 10);
        }
    }

    painter.setPen(Utils::StyleHelper::borderColor());
    painter.drawLine(rect.topRight(), rect.bottomRight());

    QColor light = Utils::StyleHelper::sidebarHighlight();
    painter.setPen(light);
    painter.drawLine(rect.bottomLeft(), rect.bottomRight());
}

int FancyTabWidget::current_index() const
{
    return stack_->currentIndex();
}

void FancyTabWidget::SetCurrentIndex(int index)
{
    if (FancyTabBar* bar = qobject_cast<FancyTabBar*>(tab_bar_)) {
        bar->setCurrentIndex(index);
    }
    else if (QTabBar* bar = qobject_cast<QTabBar*>(tab_bar_)) {
        bar->setCurrentIndex(index);
    }
    else {
        stack_->setCurrentIndex(index);
    }
}

void FancyTabWidget::ShowWidget(int index)
{
    stack_->setCurrentIndex(index);
    emit CurrentChanged(index);
}

void FancyTabWidget::AddBottomWidget(QWidget* widget)
{
    top_layout_->addWidget(widget);
}

void FancyTabWidget::SetMode(Mode mode)
{
    // Remove previous tab bar
    delete tab_bar_;
    tab_bar_ = NULL;

    use_background_ = false;

    // Create new tab bar
    switch (mode) {
    case Mode_None:
    default:
        qDebug() << "Unknown fancy tab mode" << mode;
        // fallthrough

    case Mode_LargeSidebar: {
        FancyTabBar* bar = new FancyTabBar(this);
        side_layout_->insertWidget(0, bar);
        tab_bar_ = bar;

        foreach(const Item & item, items_) {
            if (item.type_ == Item::Type_Spacer) {
                bar->addSpacer(item.spacer_size_);
            }
            else {
                bar->addTab(item.tab_icon_, item.tab_label_);
            }
        }

        bar->setCurrentIndex(stack_->currentIndex());
        connect(bar, SIGNAL(currentChanged(int)), SLOT(ShowWidget(int)));

        use_background_ = true;

        break;
    }

    case Mode_Tabs:
        MakeTabBar(QTabBar::RoundedNorth, true, false, false);
        break;

    case Mode_IconOnlyTabs:
        MakeTabBar(QTabBar::RoundedNorth, false, true, false);
        break;

    case Mode_SmallSidebar:
        MakeTabBar(QTabBar::RoundedWest, true, true, true);
        use_background_ = true;
        break;

    case Mode_PlainSidebar:
        MakeTabBar(QTabBar::RoundedWest, true, true, false);
        break;
    }

    tab_bar_->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);

    mode_ = mode;
    emit ModeChanged(mode);
    update();
}

void FancyTabWidget::contextMenuEvent(QContextMenuEvent* e)
{
    Q_UNUSED(e)
//  if (!menu_) {
//    menu_ = new QMenu(this);

//    QSignalMapper* mapper = new QSignalMapper(this);
//    QActionGroup* group = new QActionGroup(this);
//    AddMenuItem(mapper, group, tr("Large sidebar"), Mode_LargeSidebar);
//    AddMenuItem(mapper, group, tr("Small sidebar"), Mode_SmallSidebar);
//    AddMenuItem(mapper, group, tr("Plain sidebar"), Mode_PlainSidebar);
//    AddMenuItem(mapper, group, tr("Tabs on top"), Mode_Tabs);
//    AddMenuItem(mapper, group, tr("Icons on top"), Mode_IconOnlyTabs);
//    menu_->addActions(group->actions());

//    connect(mapper, SIGNAL(mapped(int)), SLOT(SetMode(int)));
//  }

//  menu_->popup(e->globalPos());
}

void FancyTabWidget::AddMenuItem(QSignalMapper* mapper, QActionGroup* group,
                                 const QString &text, Mode mode)
{
    QAction* action = group->addAction(text);
    action->setCheckable(true);
    mapper->setMapping(action, mode);
    connect(action, SIGNAL(triggered()), mapper, SLOT(map()));

    if (mode == mode_) {
        action->setChecked(true);
    }
}

void FancyTabWidget::MakeTabBar(QTabBar::Shape shape, bool text, bool icons,
                                bool fancy)
{
    QTabBar* bar = new QTabBar(this);
    bar->setShape(shape);
    bar->setDocumentMode(true);
    bar->setUsesScrollButtons(true);

    if (shape == QTabBar::RoundedWest) {
        bar->setIconSize(QSize(22, 22));
    }

    if (fancy) {
        bar->setStyle(proxy_style_);
    }

    if (shape == QTabBar::RoundedNorth) {
        top_layout_->insertWidget(0, bar);
    }
    else {
        side_layout_->insertWidget(0, bar);
    }

    foreach(const Item & item, items_) {
        if (item.type_ != Item::Type_Tab) {
            continue;
        }

        QString label = item.tab_label_;
        if (shape == QTabBar::RoundedWest) {
            label = QFontMetrics(font()).elidedText(label, Qt::ElideMiddle, 100);
        }

        int tab_id = -1;
        if (icons && text) {
            tab_id = bar->addTab(item.tab_icon_, label);
        }
        else if (icons) {
            tab_id = bar->addTab(item.tab_icon_, QString());
        }
        else if (text) {
            tab_id = bar->addTab(label);
        }

        bar->setTabToolTip(tab_id, item.tab_label_);
    }

    bar->setCurrentIndex(stack_->currentIndex());
    connect(bar, SIGNAL(currentChanged(int)), SLOT(ShowWidget(int)));
    tab_bar_ = bar;
}