qt5-legatus-legacy/Lts/Viewer/LtsDataView/tree_view_delegate.cpp

#include "lts_data_view.h"
#include "tree_view_delegate.h"
#include "search_model.h"

#include <QApplication>
#include <QComboBox>
#include <QTimer>
//#include <QDebug>

namespace LtsDataView
{
TreeViewDelegate::ComboBoxData TreeViewDelegate::comboBoxData(const QModelIndex &index)
{
  const SearchModel *sm = qobject_cast<const SearchModel *>(index.model());
  if (!sm)
    return {};
  const QAbstractItemModel *aim = sm->sourceModel();
  if (!aim)
    return {};
  const QVariant val = aim->headerData(index.column(), Qt::Horizontal, LtsWidgets::LtsColumnFilterProxyModel::ComboboxFilterRole);
  return LtsWidgets::ComboboxFilterContent::fromVariant(val);
}


void TreeViewDelegate::paint(QPainter *painter,
                             const QStyleOptionViewItem &option, const QModelIndex &index) const
{
  const ComboBoxData cbd = comboBoxData(index);
  if (!cbd.isValid())
    return QStyledItemDelegate::paint(painter, option, index);

  const QWidget *const widget = option.widget;
  QStyle* const style = widget ? widget->style() : QApplication::style();
  QStyleOptionComboBox cbOption;
  cbOption.rect = option.rect;
  cbOption.direction = option.direction;
  const auto currentData = index.data(LtsWidgets::LtsColumnFilterProxyModel::ComboboxFilterRole);
  for (const auto &content : cbd.data)
  {
    if (content.data == currentData)
    {
      cbOption.currentIcon = content.icon;
      break;
    }
  }
  cbOption.currentText = index.data(Qt::DisplayRole).toString();
  cbOption.fontMetrics = option.fontMetrics;
  const int iconWidth = style->pixelMetric(QStyle::PM_SmallIconSize, nullptr, widget);
  cbOption.iconSize = QSize(iconWidth, iconWidth);
  cbOption.palette = option.palette;
  cbOption.state = option.state;
  cbOption.styleObject = option.styleObject;
  style->drawComplexControl(QStyle::CC_ComboBox, &cbOption, painter, widget);
  style->drawControl(QStyle::CE_ComboBoxLabel, &cbOption, painter, widget);
}


QWidget *TreeViewDelegate::createEditor(QWidget *parent, const QStyleOptionViewItem &option,
                                        const QModelIndex &index) const
{
  Q_UNUSED(option);

  const ComboBoxData cbd = comboBoxData(index);
  if (cbd.isValid())
  {
    QComboBox *cbx = new QComboBox(parent);
    for (const auto &content : cbd.data)
      cbx->addItem(content.icon, content.text, content.data);
    if (cbd.sortItems)
      cbx->model()->sort(0);
    cbx->insertItem(0, noFilterString());
    connect(cbx, QOverload<int>::of(&QComboBox::currentIndexChanged),
            this, &TreeViewDelegate::slotFinished);
    QTimer::singleShot(0, cbx, &QComboBox::showPopup);
    return cbx;
  }
  else
  {
#ifdef TABLET_MODE
    //qWarning() << "TABLET MODE !!!!!!!!";
    // no line edit as it crashes
    return nullptr;
#else
    //qWarning() << "****NO**** TABLET MODE !!!!!!!!!!!!!!!!";
    SearchLineEdit *edit = new SearchLineEdit(parent);
    edit->setFrame(false);
    connect(edit, &SearchLineEdit::editingFinished,
            this, &TreeViewDelegate::slotFinished);
    return edit;
#endif
  }
}


void TreeViewDelegate::setModelData(QWidget *editor, QAbstractItemModel *model,
                                    const QModelIndex &index) const
{
  const ComboBoxData cbd = comboBoxData(index);
  if (cbd.isValid())
  {
    QComboBox *cbx = qobject_cast<QComboBox *>(editor);
    if (cbx)
    {
      // save the current data since it may change within setData() due to dataChanged() signals
      const QString curTxt = cbx->currentText();
      const QVariant curData = cbx->currentData();
      model->setData(index, curData, LtsWidgets::LtsColumnFilterProxyModel::ComboboxFilterRole);
      model->setData(index, curTxt, Qt::DisplayRole);
    }
  }
  else
  {
    SearchLineEdit *edit = qobject_cast<SearchLineEdit *>(editor);
    if (edit)
    {
      model->setData(index, edit->text(), Qt::DisplayRole);
      model->setData(index, edit->text(), Qt::EditRole);
    }
  }
}

void TreeViewDelegate::slotFinished()
{
  QWidget *w = qobject_cast<QWidget *>(sender());
  if (!w)
    return;

  emit commitData(w);
  emit closeEditor(w);
}

void TreeViewDelegate::setEditorData(QWidget *editor, const QModelIndex &index) const
{
  const ComboBoxData cbd = comboBoxData(index);
  if (cbd.isValid())
  {
    QComboBox *cbx = qobject_cast<QComboBox *>(editor);
    if (cbx)
    {
      const auto currentData = index.data(LtsWidgets::LtsColumnFilterProxyModel::ComboboxFilterRole);
      cbx->setCurrentIndex(cbx->findData(currentData));
    }
  }
  else
  {
    SearchLineEdit *edit = qobject_cast<SearchLineEdit *>(editor);
    if (edit)
      edit->setText(index.data().toString());
  }
}

} // namespace LtsDataView