text: /****************************************************************************
  **
  ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
  ** Contact: http://www.qt-project.org/legal
  **
  ** This file is part of the QtWidgets module of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:LGPL$
  ** Commercial License Usage
  ** 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
  ** a written agreement between you and Digia.  For licensing terms and
  ** conditions see http://qt.digia.com/licensing.  For further information
  ** use the contact form at http://qt.digia.com/contact-us.
  **
  ** 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
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  ** rights.  These rights are described in the Digia Qt LGPL Exception
  ** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
  **
  ** GNU General Public License Usage
  ** Alternatively, this file may be used under the terms of the GNU
  ** General Public License version 3.0 as published by the Free Software
  ** Foundation and appearing in the file LICENSE.GPL included in the
  ** packaging of this file.  Please review the following information to
  ** ensure the GNU General Public License version 3.0 requirements will be
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  ****************************************************************************/
  
  #ifndef QTABBAR_P_H
  #define QTABBAR_P_H
  
  //
  //  W A R N I N G
  //  -------------
  //
  // This file is not part of the Qt API.  It exists purely as an
  // implementation detail.  This header file may change from version to
  // version without notice, or even be removed.
  //
  // We mean it.
  //
  
  #include "qtabbar.h"
  #include "private/qwidget_p.h"
  
  #include <qicon.h>
  #include <qtoolbutton.h>
  #include <qdebug.h>
  #include <qvariantanimation.h>
  
  #ifndef QT_NO_TABBAR
  
  #define ANIMATION_DURATION 250
  
  #include <qstyleoption.h>
  
  QT_BEGIN_NAMESPACE
  
  class QTabBarPrivate  : public QWidgetPrivate
  {
      Q_DECLARE_PUBLIC(QTabBar)
  public:
      QTabBarPrivate()
          :currentIndex(-1), pressedIndex(-1), shape(QTabBar::RoundedNorth), layoutDirty(false),
          drawBase(true), scrollOffset(0), elideModeSetByUser(false), useScrollButtonsSetByUser(false), expanding(true), closeButtonOnTabs(false),
          selectionBehaviorOnRemove(QTabBar::SelectRightTab), paintWithOffsets(true), movable(false),
          dragInProgress(false), documentMode(false), movingTab(0)
  #ifdef Q_WS_MAC
          , previousPressedIndex(-1)
  #endif
          {}
  
      int currentIndex;
      int pressedIndex;
      QTabBar::Shape shape;
      bool layoutDirty;
      bool drawBase;
      int scrollOffset;
  
      struct Tab {
          inline Tab(const QIcon &ico, const QString &txt)
              : enabled(true) , shortcutId(0), text(txt), icon(ico),
              leftWidget(0), rightWidget(0), lastTab(-1), dragOffset(0)
  #ifndef QT_NO_ANIMATION
              , animation(0)
  #endif //QT_NO_ANIMATION
          {}
          bool operator==(const Tab &other) const { return &other == this; }
          bool enabled;
          int shortcutId;
          QString text;
  #ifndef QT_NO_TOOLTIP
          QString toolTip;
  #endif
  #ifndef QT_NO_WHATSTHIS
          QString whatsThis;
  #endif
          QIcon icon;
          QRect rect;
          QRect minRect;
          QRect maxRect;
  
          QColor textColor;
          QVariant data;
          QWidget *leftWidget;
          QWidget *rightWidget;
          int lastTab;
          int dragOffset;
  
  #ifndef QT_NO_ANIMATION
          ~Tab() { delete animation; }
          struct TabBarAnimation : public QVariantAnimation {
              TabBarAnimation(Tab *t, QTabBarPrivate *_priv) : tab(t), priv(_priv)
              { setEasingCurve(QEasingCurve::InOutQuad); }
  
              void updateCurrentValue(const QVariant &current);
  
              void updateState(State, State newState);
          private:
              //these are needed for the callbacks
              Tab *tab;
              QTabBarPrivate *priv;
          } *animation;
  
          void startAnimation(QTabBarPrivate *priv, int duration) {
              if (!priv->isAnimated()) {
                  priv->moveTabFinished(priv->tabList.indexOf(*this));
                  return;
              }
              if (!animation)
                  animation = new TabBarAnimation(this, priv);
              animation->setStartValue(dragOffset);
              animation->setEndValue(0);
              animation->setDuration(duration);
              animation->start();
          }
  #else
          void startAnimation(QTabBarPrivate *priv, int duration)
          { Q_UNUSED(duration); priv->moveTabFinished(priv->tabList.indexOf(*this)); }
  #endif //QT_NO_ANIMATION
      };
      QList<Tab> tabList;
  
      int calculateNewPosition(int from, int to, int index) const;
      void slide(int from, int to);
      void init();
      int extraWidth() const;
  
      Tab *at(int index);
      const Tab *at(int index) const;
  
      int indexAtPos(const QPoint &p) const;
  
      inline bool isAnimated() const { Q_Q(const QTabBar); return q->style()->styleHint(QStyle::SH_Widget_Animate, 0, q); }
      inline bool validIndex(int index) const { return index >= 0 && index < tabList.count(); }
      void setCurrentNextEnabledIndex(int offset);
  
      QToolButton* rightB; // right or bottom
      QToolButton* leftB; // left or top
  
      void _q_scrollTabs();
      void _q_closeTab();
      void moveTab(int index, int offset);
      void moveTabFinished(int index);
      QRect hoverRect;
  
      void refresh();
      void layoutTabs();
      void layoutWidgets(int start = 0);
      void layoutTab(int index);
      void updateMacBorderMetrics();
      void setupMovableTab();
  
      void makeVisible(int index);
      QSize iconSize;
      Qt::TextElideMode elideMode;
      bool elideModeSetByUser;
      bool useScrollButtons;
      bool useScrollButtonsSetByUser;
  
      bool expanding;
      bool closeButtonOnTabs;
      QTabBar::SelectionBehavior selectionBehaviorOnRemove;
  
      QPoint dragStartPosition;
      bool paintWithOffsets;
      bool movable;
      bool dragInProgress;
      bool documentMode;
  
      QWidget *movingTab;
  #ifdef Q_WS_MAC
      int previousPressedIndex;
  #endif
      // shared by tabwidget and qtabbar
      static void initStyleBaseOption(QStyleOptionTabBarBaseV2 *optTabBase, QTabBar *tabbar, QSize size)
      {
          QStyleOptionTab tabOverlap;
          tabOverlap.shape = tabbar->shape();
          int overlap = tabbar->style()->pixelMetric(QStyle::PM_TabBarBaseOverlap, &tabOverlap, tabbar);
          QWidget *theParent = tabbar->parentWidget();
          optTabBase->init(tabbar);
          optTabBase->shape = tabbar->shape();
          optTabBase->documentMode = tabbar->documentMode();
          if (theParent && overlap > 0) {
              QRect rect;
              switch (tabOverlap.shape) {
              case QTabBar::RoundedNorth:
              case QTabBar::TriangularNorth:
                  rect.setRect(0, size.height()-overlap, size.width(), overlap);
                  break;
              case QTabBar::RoundedSouth:
              case QTabBar::TriangularSouth:
                  rect.setRect(0, 0, size.width(), overlap);
                  break;
              case QTabBar::RoundedEast:
              case QTabBar::TriangularEast:
                  rect.setRect(0, 0, overlap, size.height());
                  break;
              case QTabBar::RoundedWest:
              case QTabBar::TriangularWest:
                  rect.setRect(size.width() - overlap, 0, overlap, size.height());
                  break;
              }
              optTabBase->rect = rect;
          }
      }
  
  };
  
  class CloseButton : public QAbstractButton
  {
      Q_OBJECT
  
  public:
      CloseButton(QWidget *parent = 0);
  
      QSize sizeHint() const;
      inline QSize minimumSizeHint() const
          { return sizeHint(); }
      void enterEvent(QEvent *event);
      void leaveEvent(QEvent *event);
      void paintEvent(QPaintEvent *event);
  };
  
  
  QT_END_NAMESPACE
  
  #endif
  
  #endif
  