C++ QTreeWidgetItem::read方法代码示例

void TreeWidget::dragMoveEvent(QDragMoveEvent* event)
{
    const QMimeData* mimeData = event->mimeData();
    bool accept = false;
    if (mimeData->hasUrls()) {
        accept = true;
    }
    else if (mimeData->hasFormat(m_mimeType)) {
        QTreeWidgetItem* itemUnderMouse = itemAt(event->pos());
        if (!itemUnderMouse) {
            return;
        }

        bool underMouseIsFolder = (itemUnderMouse && itemUnderMouse->text(1).isEmpty());
        int top = visualItemRect(itemUnderMouse).top();
        int bottom = visualItemRect(itemUnderMouse).bottom();
        int y = event->pos().y();
        bool overEdgeOfItem = (y >= top - 1 && y <= top + 1) || (y <= bottom + 1 && y >= bottom - 1);

        QByteArray ba = mimeData->data(m_mimeType);
        QDataStream stream(&ba, QIODevice::ReadOnly);

        while (!stream.atEnd()) {
            QTreeWidgetItem* dragItem = new QTreeWidgetItem;
            dragItem->read(stream);
            bool parentIsRoot = dragItem->data(0, ITEM_IS_TOPLEVEL).toBool();
            QString oldParentTitle = dragItem->data(0, ITEM_PARENT_TITLE).toString();

            bool itemIsFolder = dragItem->text(1).isEmpty();
            if (dragItem->text(0) != _bookmarksMenu
                    && dragItem->text(0) != _bookmarksToolbar) {
                if (!itemUnderMouse->parent() && !parentIsRoot && overEdgeOfItem) {
                    accept = true;
                    break;
                }
                bool parentsAreDifferent = parentIsRoot
                                           ? itemUnderMouse->parent() != 0
                                           : (!itemUnderMouse->parent() || itemUnderMouse->parent()->text(0) != oldParentTitle);
                bool canHasSubFolder = !itemUnderMouse->parent()
                                       || itemUnderMouse->parent() == invisibleRootItem()
                                       || itemUnderMouse->parent()->text(0) == _bookmarksToolbar;

                if (!underMouseIsFolder && parentsAreDifferent) {
                    if (!itemIsFolder) {
                        accept = true;
                        break;
                    }
                    else if (!itemUnderMouse->parent()
                             || (dragItem->text(0) != itemUnderMouse->parent()->text(0)
                                 && canHasSubFolder)) {
                        accept = true;
                        break;
                    }
                }
                else if (underMouseIsFolder) {
                    if (itemIsFolder && itemUnderMouse->text(0) == _bookmarksToolbar
                            && (parentIsRoot || oldParentTitle != _bookmarksToolbar)) {
                        accept = true;
                        break;
                    }
                    else if (!itemIsFolder && oldParentTitle != itemUnderMouse->text(0)) {
                        accept = true;
                        break;
                    }
                }
            }
        }
    }

    QTreeWidget::dragMoveEvent(event);
    if (accept) {
        event->acceptProposedAction();
    }
    else {
        event->ignore();
    }
}

void QTreeWidgetItemProto::read(QDataStream &in)
{
  QTreeWidgetItem *item = qscriptvalue_cast<QTreeWidgetItem*>(thisObject());
  if (item)
    item->read(in);
}

bool TreeWidget::dropMimeData(QTreeWidgetItem* parent, int,
                              const QMimeData* data, Qt::DropAction action)
{
    if (action == Qt::IgnoreAction) {
        return true;
    }

    if (parent && !parent->text(1).isEmpty()) { // parent is a bookmark, go one level up!
        parent = parent->parent();
    }

    if (!parent) {
        parent = invisibleRootItem();
    }

    bool ok = false;
    if (data->hasUrls()) {
        QString folder = (parent == invisibleRootItem()) ? QLatin1String("unsorted") : parent->text(0);
        QUrl url = data->urls().at(0);
        QString title = data->text().isEmpty() ? url.host() + url.path() : data->text();
        emit linkWasDroped(url, title, data->imageData(), folder, &ok);

        return ok;
    }

    if (!data->hasFormat(m_mimeType)) {
        return false;
    }

    QApplication::setOverrideCursor(QCursor(Qt::WaitCursor));

    QByteArray ba = data->data(m_mimeType);
    QDataStream stream(&ba, QIODevice::ReadOnly);
    if (stream.atEnd()) {
        return false;
    }

    QSqlDatabase db = QSqlDatabase::database();
    db.transaction();

    setUpdatesEnabled(false);

    while (!stream.atEnd()) {
        QTreeWidgetItem* item = new QTreeWidgetItem;
        item->read(stream);
        bool parentIsRoot = item->data(0, ITEM_IS_TOPLEVEL).toBool();
        QString oldParentTitle = item->data(0, ITEM_PARENT_TITLE).toString();

        bool isFolder = item->text(1).isEmpty();
        if (isFolder && (item->text(0) == _bookmarksMenu ||
                         item->text(0) == _bookmarksToolbar)) {
            continue;
        }

        bool parentIsOldParent = parentIsRoot ? (parent == invisibleRootItem()) : (oldParentTitle == parent->text(0));
        if (parentIsOldParent || (isFolder && parent != invisibleRootItem() &&
                                  parent->text(0) != _bookmarksToolbar)) {
            // just 'Bookmarks In ToolBar' folder can have subfolders
            continue;
        }

        if (isFolder) {
            emit folderParentChanged(item->text(0), parent->text(0) == _bookmarksToolbar, &ok);
        }
        else {
            emit bookmarkParentChanged(item->data(0, Qt::UserRole + 10).toInt(),
                                       parent->text(0), oldParentTitle, &ok);
        }

        if (!ok) {
            continue;
        }
    }

    db.commit();
    clearSelection();
    setUpdatesEnabled(true);
    QApplication::restoreOverrideCursor();
    return true;
}