C++ QWidget::getContentsMargins方法代码示例

void EmbeddedWebView::findScrollParent()
{
    if (m_scrollParent)
        m_scrollParent->removeEventFilter(this);
    m_scrollParent = 0;
    m_scrollParentPadding = 4;
    QWidget *runner = this;
    int left, top, right, bottom;
    while (runner) {
        runner->setSizePolicy(QSizePolicy::Preferred, QSizePolicy::Preferred);
        runner->getContentsMargins(&left, &top, &right, &bottom);
        m_scrollParentPadding += left + right + 4;
        if (runner->layout()) {
            runner->layout()->getContentsMargins(&left, &top, &right, &bottom);
            m_scrollParentPadding += left + right;
        }
        QWidget *p = runner->parentWidget();
        if (p && qobject_cast<MessageView*>(runner) && // is this a MessageView?
            p->objectName() == "qt_scrollarea_viewport" && // in a viewport?
            qobject_cast<QAbstractScrollArea*>(p->parentWidget())) { // that is used?
            p->getContentsMargins(&left, &top, &right, &bottom);
            m_scrollParentPadding += left + right + 4;
            if (p->layout()) {
                p->layout()->getContentsMargins(&left, &top, &right, &bottom);
                m_scrollParentPadding += left + right;
            }
            m_scrollParent = p->parentWidget();
            break; // then we have our actual message view
        }
        runner = p;
    }
    m_scrollParentPadding += style()->pixelMetric(QStyle::PM_ScrollBarExtent, 0, m_scrollParent);
    if (m_scrollParent)
        m_scrollParent->installEventFilter(this);
}

// -------------------------------------------------------------------------
void ctkTreeComboBox::resizePopup()
{
  // copied from QComboBox.cpp
  Q_D(ctkTreeComboBox);

  QStyle * const style = this->style();
  QWidget* container = qobject_cast<QWidget*>(this->view()->parent());

  QStyleOptionComboBox opt;
  this->initStyleOption(&opt);
  QRect listRect(style->subControlRect(QStyle::CC_ComboBox, &opt,
                                       QStyle::SC_ComboBoxListBoxPopup, this));
  QRect screen = QApplication::desktop()->availableGeometry(
    QApplication::desktop()->screenNumber(this));
  QPoint below = this->mapToGlobal(listRect.bottomLeft());
  int belowHeight = screen.bottom() - below.y();
  QPoint above = this->mapToGlobal(listRect.topLeft());
  int aboveHeight = above.y() - screen.y();
  bool boundToScreen = !this->window()->testAttribute(Qt::WA_DontShowOnScreen);

  const bool usePopup = style->styleHint(QStyle::SH_ComboBox_Popup, &opt, this);
    {
    int listHeight = 0;
    int count = 0;
    QStack<QModelIndex> toCheck;
    toCheck.push(this->view()->rootIndex());
#ifndef QT_NO_TREEVIEW
    QTreeView *treeView = qobject_cast<QTreeView*>(this->view());
    if (treeView && treeView->header() && !treeView->header()->isHidden())
      listHeight += treeView->header()->height();
#endif
    while (!toCheck.isEmpty())
      {
      QModelIndex parent = toCheck.pop();
      for (int i = 0; i < this->model()->rowCount(parent); ++i)
        {
        QModelIndex idx = this->model()->index(i, this->modelColumn(), parent);
        if (!idx.isValid())
          {
          continue;
          }
        listHeight += this->view()->visualRect(idx).height(); /* + container->spacing() */;
#ifndef QT_NO_TREEVIEW
        if (this->model()->hasChildren(idx) && treeView && treeView->isExpanded(idx))
          {
          toCheck.push(idx);
          }
#endif
        ++count;
        if (!usePopup && count > this->maxVisibleItems())
          {
          toCheck.clear();
          break;
          }
        }
      }
    listRect.setHeight(listHeight);
    }
      {
      // add the spacing for the grid on the top and the bottom;
      int heightMargin = 0;//2*container->spacing();

      // add the frame of the container
      int marginTop, marginBottom;
      container->getContentsMargins(0, &marginTop, 0, &marginBottom);
      heightMargin += marginTop + marginBottom;

      //add the frame of the view
      this->view()->getContentsMargins(0, &marginTop, 0, &marginBottom);
      //marginTop += static_cast<QAbstractScrollAreaPrivate *>(QObjectPrivate::get(this->view()))->top;
      //marginBottom += static_cast<QAbstractScrollAreaPrivate *>(QObjectPrivate::get(this->view()))->bottom;
      heightMargin += marginTop + marginBottom;

      listRect.setHeight(listRect.height() + heightMargin);
      }

      // Add space for margin at top and bottom if the style wants it.
      if (usePopup)
        {
        listRect.setHeight(listRect.height() + style->pixelMetric(QStyle::PM_MenuVMargin, &opt, this) * 2);
        }

      // Make sure the popup is wide enough to display its contents.
      if (usePopup)
        {
        const int diff = d->computeWidthHint() - this->width();
        if (diff > 0)
          {
          listRect.setWidth(listRect.width() + diff);
          }
        }

      //we need to activate the layout to make sure the min/maximum size are set when the widget was not yet show
      container->layout()->activate();
      //takes account of the minimum/maximum size of the container
      listRect.setSize( listRect.size().expandedTo(container->minimumSize())
                        .boundedTo(container->maximumSize()));

      // make sure the widget fits on screen
//.........这里部分代码省略.........

void QWidgetProto::getContentsMargins(int *left, int * top, int * right, int * bottom) const
{
  QWidget *item = qscriptvalue_cast<QWidget*>(thisObject());
  if (item)
    item->getContentsMargins(left, top, right, bottom);
}