QTreeView焦点问题

#include <QtCore> #include "booleanmodel.h" #include "booleanparser.h" BooleanModel::BooleanModel(QObject *parent) : QAbstractItemModel(parent) { rootNode = 0; } BooleanModel::~BooleanModel() { delete rootNode; } void BooleanModel::setRootNode(Node *node) { delete rootNode; rootNode = node; // reset(); } QModelIndex BooleanModel::index(int row, int column, const QModelIndex &parent) const { if (!rootNode || row < 0 || column < 0) return QModelIndex(); Node *parentNode = nodeFromIndex(parent); Node *childNode = parentNode->children.value(row); if (!childNode) return QModelIndex(); return createIndex(row, column, childNode); } QModelIndex BooleanModel::parent(const QModelIndex &child) const { Node *node = nodeFromIndex(child); if (!node) return QModelIndex(); Node *parentNode = node->parent; if (!parentNode) return QModelIndex(); Node *grandparentNode = parentNode->parent; if (!grandparentNode) return QModelIndex(); int row = grandparentNode->children.indexOf(parentNode); return createIndex(row, 0, parentNode); } int BooleanModel::rowCount(const QModelIndex &parent) const { if (parent.column() > 0) return 0; Node *parentNode = nodeFromIndex(parent); if (!parentNode) return 0; return parentNode->children.count(); } int BooleanModel::columnCount(const QModelIndex & /* parent */) const { return 2; } QVariant BooleanModel::data(const QModelIndex &index, int role) const { if (role != Qt::DisplayRole) return QVariant(); Node *node = nodeFromIndex(index); if (!node) return QVariant(); if (index.column() == 0) { switch (node->type) { case Node::Root: return tr("Root"); case Node::OrExpression: return tr("OR Expression"); case Node::AndExpression: return tr("AND Expression"); case Node::NotExpression: return tr("NOT Expression"); case Node::Atom: return tr("Atom"); case Node::Identifier: return tr("Identifier"); case Node::Operator: return tr("Operator"); case Node::Punctuator: return tr("Punctuator"); default: return tr("Unknown"); } } else if (index.column() == 1) { return node->str; } return QVariant(); } QVariant BooleanModel::headerData(int section, Qt::Orientation orientation, int role) const { if (orientation == Qt::Horizontal && role == Qt::DisplayRole) { if (section == 0) { return tr("Node"); } else if (section == 1) { return tr("Value"); } } return QVariant(); } Node *BooleanModel::nodeFromIndex(const QModelIndex &index) const { if (index.isValid()) { return static_cast<Node *>(index.internalPointer()); } else { return rootNode; } }