/**************************************************************************
**
** This file is part of Qt Creator
**
** Copyright (c) 2010 Nokia Corporation and/or its subsidiary(-ies).
**
** Contact: Nokia Corporation (qt-info@nokia.com)
**
** Commercial Usage
**
** Licensees holding valid Qt Commercial licenses may use this file in
** 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
**
** 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.
**
** If you are unsure which license is appropriate for your use, please
** contact the sales department at http://qt.nokia.com/contact.
**
**************************************************************************/

#ifndef FANCYTABWIDGET_H
#define FANCYTABWIDGET_H

#include <QIcon>
#include <QPropertyAnimation>
#include <QProxyStyle>
#include <QTabBar>
#include <QTimer>
#include <QWidget>

class QActionGroup;
class QMenu;
class QPainter;
class QSignalMapper;
class QStackedLayout;
class QStatusBar;
class QVBoxLayout;

namespace Core {
namespace Internal {

class FancyTabProxyStyle : public QProxyStyle {
  Q_OBJECT

public:
  void drawControl(ControlElement element, const QStyleOption* option,
                   QPainter* painter, const QWidget* widget) const;
  void polish(QWidget* widget);
  void polish(QApplication* app);
  void polish(QPalette& palette);

protected:
  bool eventFilter(QObject* o, QEvent* e);
};

class FancyTab : public QWidget{
    Q_OBJECT

    Q_PROPERTY(float fader READ fader WRITE setFader)
public:
    FancyTab(QWidget *tabbar);
    float fader() { return m_fader; }
    void setFader(float value);

    QSize sizeHint() const;

    void fadeIn();
    void fadeOut();

    QIcon icon;
    QString text;

protected:
    void enterEvent(QEvent *);
    void leaveEvent(QEvent *);

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

class FancyTabBar : public QWidget
{
    Q_OBJECT

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

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

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

    void addTab(const QIcon &icon, const QString &label);
    void addSpacer(int size = 40);
    void removeTab(int index) {
        FancyTab *tab = m_tabs.takeAt(index);
        delete tab;
    }
    void setCurrentIndex(int index);
    int currentIndex() const { return m_currentIndex; }

    void setTabToolTip(int index, const QString& toolTip);
    QString tabToolTip(int index) const;

    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;
    int m_currentIndex;
    QList<FancyTab*> m_tabs;
    QTimer m_triggerTimer;
    QSize tabSizeHint(bool minimum = false) const;

};

class FancyTabWidget : public QWidget {
    Q_OBJECT

    Q_PROPERTY(QPixmap bgPixmap READ bgPixmap WRITE SetBackgroundPixmap)

public:
  FancyTabWidget(QWidget* parent = 0);

  // Values are persisted - only add to the end
  enum Mode {
    Mode_None = 0,

    Mode_LargeSidebar = 1,
    Mode_SmallSidebar = 2,
    Mode_Tabs = 3,
    Mode_IconOnlyTabs = 4,
    Mode_PlainSidebar = 5,
  };

  struct Item {
    Item(const QIcon& icon, const QString& label)
      : type_(Type_Tab), tab_label_(label), tab_icon_(icon), spacer_size_(0) {}
    Item(int size) : type_(Type_Spacer), spacer_size_(size) {}

    enum Type {
      Type_Tab,
      Type_Spacer,
    };

    Type type_;
    QString tab_label_;
    QIcon tab_icon_;
    int spacer_size_;
  };

  void AddTab(QWidget *tab, const QIcon &icon, const QString &label);
  void AddSpacer(int size = 40);
  void SetBackgroundPixmap(const QPixmap& pixmap);

  void AddBottomWidget(QWidget* widget);

  int current_index() const;
  Mode mode() const { return mode_; }
  QPixmap bgPixmap() { return background_pixmap_; }

public slots:
  void SetCurrentIndex(int index);
  void SetMode(Mode mode);
  void SetMode(int mode) { SetMode(Mode(mode)); }

signals:
  void CurrentChanged(int index);
  void ModeChanged(FancyTabWidget::Mode mode);

protected:
  void paintEvent(QPaintEvent *event);
  void contextMenuEvent(QContextMenuEvent* e);

private slots:
  void ShowWidget(int index);

private:
  void MakeTabBar(QTabBar::Shape shape, bool text, bool icons, bool fancy);
  void AddMenuItem(QSignalMapper* mapper, QActionGroup* group,
                   const QString& text, Mode mode);

  Mode mode_;
  QList<Item> items_;

  QWidget* tab_bar_;
  QStackedLayout* stack_;
  QPixmap background_pixmap_;
  QWidget* side_widget_;
  QVBoxLayout* side_layout_;
  QVBoxLayout* top_layout_;

  bool use_background_;

  QMenu* menu_;

  FancyTabProxyStyle* proxy_style_;
};

} // namespace Internal
} // namespace Core

Q_DECLARE_METATYPE(QPropertyAnimation*);

using Core::Internal::FancyTab;
using Core::Internal::FancyTabBar;
using Core::Internal::FancyTabWidget;

#endif // FANCYTABWIDGET_H