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  #include "treewidgetcolumnstretcher.h"
  #include <QTreeWidget>
  #include <QHideEvent>
  #include <QHeaderView>
  
  using namespace Utils;
  
  /*!
      \class Utils::TreeWidgetColumnStretcher
  
      \brief The class fixes QTreeWidget to resize all columns to contents, except one
      stretching column.
  
      As opposed to standard QTreeWidget, all columns are
      still interactively resizable.
  */
  
  TreeWidgetColumnStretcher::TreeWidgetColumnStretcher(QTreeWidget *treeWidget, int columnToStretch)
          : QObject(treeWidget->header()), m_columnToStretch(columnToStretch)
  {
      parent()->installEventFilter(this);
      QHideEvent fake;
      TreeWidgetColumnStretcher::eventFilter(parent(), &fake);
  }
  
  bool TreeWidgetColumnStretcher::eventFilter(QObject *obj, QEvent *ev)
  {
      if (obj == parent()) {
          if (ev->type() == QEvent::Show) {
              QHeaderView *hv = qobject_cast<QHeaderView*>(obj);
              for (int i = 0; i < hv->count(); ++i)
                  hv->setResizeMode(i, QHeaderView::Interactive);
          } else if (ev->type() == QEvent::Hide) {
              QHeaderView *hv = qobject_cast<QHeaderView*>(obj);
              for (int i = 0; i < hv->count(); ++i)
                  hv->setResizeMode(i, i == m_columnToStretch ? QHeaderView::Stretch : QHeaderView::ResizeToContents);
          } else if (ev->type() == QEvent::Resize) {
              QHeaderView *hv = qobject_cast<QHeaderView*>(obj);
              if (hv->resizeMode(m_columnToStretch) == QHeaderView::Interactive) {
                  QResizeEvent *re = static_cast<QResizeEvent*>(ev);
                  int diff = re->size().width() - re->oldSize().width() ;
                  hv->resizeSection(m_columnToStretch, qMax(32, hv->sectionSize(1) + diff));
              }
          }
      }
      return false;
  }
  