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**
** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** This file is part of Qt Creator.
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** Licensees holding valid commercial Qt licenses may use this file in
** accordance with the commercial license agreement provided with the
** Software or, alternatively, in accordance with the terms contained in
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** use the contact form at http://qt.digia.com/contact-us.
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** 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
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****************************************************************************/

#ifndef FANCYTABWIDGET_H
#define FANCYTABWIDGET_H

#include <QIcon>
#include <QWidget>

#include <QTimer>
#include <QPropertyAnimation>

QT_BEGIN_NAMESPACE
class QPainter;
class QStackedLayout;
class QStatusBar;
QT_END_NAMESPACE

namespace Core {
namespace Internal {

class FancyTab : public QObject
{
    Q_OBJECT

    Q_PROPERTY(float fader READ fader WRITE setFader)
public:
    FancyTab(QWidget *tabbar) : enabled(false), tabbar(tabbar), m_fader(0) {
        animator.setPropertyName("fader");
        animator.setTargetObject(this);
    }
    float fader() { return m_fader; }
    void setFader(float value);

    void fadeIn();
    void fadeOut();

    QIcon icon;
    QString text;
    QString toolTip;
    bool enabled;

private:
    QPropertyAnimation animator;
    QWidget *tabbar;
    float m_fader;
};

class FancyTabBar : public QWidget
{
    Q_OBJECT

public:
    FancyTabBar(QWidget *parent = 0);
    ~FancyTabBar();

    bool event(QEvent *event);

    void paintEvent(QPaintEvent *event);
    void paintTab(QPainter *painter, int tabIndex) const;
    void mousePressEvent(QMouseEvent *);
    void mouseMoveEvent(QMouseEvent *);
    void enterEvent(QEvent *);
    void leaveEvent(QEvent *);
    bool validIndex(int index) const { return index >= 0 && index < m_tabs.count(); }

    QSize sizeHint() const;
    QSize minimumSizeHint() const;

    void setTabEnabled(int index, bool enable);
    bool isTabEnabled(int index) const;

    void insertTab(int index, const QIcon &icon, const QString &label) {
        FancyTab *tab = new FancyTab(this);
        tab->icon = icon;
        tab->text = label;
        m_tabs.insert(index, tab);
        updateGeometry();
    }
    void setEnabled(int index, bool enabled);
    void removeTab(int index) {
        FancyTab *tab = m_tabs.takeAt(index);
        delete tab;
        updateGeometry();
    }
    void setCurrentIndex(int index);
    int currentIndex() const { return m_currentIndex; }

    void setTabToolTip(int index, QString toolTip) { m_tabs[index]->toolTip = toolTip; }
    QString tabToolTip(int index) const { return m_tabs.at(index)->toolTip; }

    QIcon tabIcon(int index) const { return m_tabs.at(index)->icon; }
    QString tabText(int index) const { return m_tabs.at(index)->text; }
    int count() const {return m_tabs.count(); }
    QRect tabRect(int index) const;

signals:
    void currentChanged(int);

public slots:
    void emitCurrentIndex();

private:
    static const int m_rounding;
    static const int m_textPadding;
    QRect m_hoverRect;
    int m_hoverIndex;
    int m_currentIndex;
    QList<FancyTab*> m_tabs;
    QTimer m_triggerTimer;
    QSize tabSizeHint(bool minimum = false) const;

};

class FancyTabWidget : public QWidget
{
    Q_OBJECT

public:
    FancyTabWidget(QWidget *parent = 0);

    void insertTab(int index, QWidget *tab, const QIcon &icon, const QString &label);
    void removeTab(int index);
    void setBackgroundBrush(const QBrush &brush);
    void addCornerWidget(QWidget *widget);
    void insertCornerWidget(int pos, QWidget *widget);
    int cornerWidgetCount() const;
    void setTabToolTip(int index, const QString &toolTip);

    void paintEvent(QPaintEvent *event);

    int currentIndex() const;
    QStatusBar *statusBar() const;

    void setTabEnabled(int index, bool enable);
    bool isTabEnabled(int index) const;

    bool isSelectionWidgetVisible() const;

signals:
    void currentAboutToShow(int index);
    void currentChanged(int index);

public slots:
    void setCurrentIndex(int index);
    void setSelectionWidgetVisible(bool visible);

private slots:
    void showWidget(int index);

private:
    FancyTabBar *m_tabBar;
    QWidget *m_cornerWidgetContainer;
    QStackedLayout *m_modesStack;
    QWidget *m_selectionWidget;
    QStatusBar *m_statusBar;
};

} // namespace Internal
} // namespace Core

#endif // FANCYTABWIDGET_H