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// Copyright (C) 2016 The Qt Company Ltd.
// SPDX-License-Identifier: LicenseRef-Qt-Commercial OR GPL-3.0-only
#include "abstractitemmodelhandler_p.h"
QT_BEGIN_NAMESPACE
AbstractItemModelHandler::AbstractItemModelHandler(QObject *parent)
: QObject(parent),
resolvePending(0),
m_fullReset(true)
{
m_resolveTimer.setSingleShot(true);
QObject::connect(&m_resolveTimer, &QTimer::timeout,
this, &AbstractItemModelHandler::handlePendingResolve);
}
AbstractItemModelHandler::~AbstractItemModelHandler()
{
}
void AbstractItemModelHandler::setItemModel(QAbstractItemModel *itemModel)
{
if (itemModel != m_itemModel.data()) {
if (!m_itemModel.isNull())
QObject::disconnect(m_itemModel, 0, this, 0);
m_itemModel = itemModel;
if (!m_itemModel.isNull()) {
QObject::connect(m_itemModel.data(), &QAbstractItemModel::columnsInserted,
this, &AbstractItemModelHandler::handleColumnsInserted);
QObject::connect(m_itemModel.data(), &QAbstractItemModel::columnsMoved,
this, &AbstractItemModelHandler::handleColumnsMoved);
QObject::connect(m_itemModel.data(), &QAbstractItemModel::columnsRemoved,
this, &AbstractItemModelHandler::handleColumnsRemoved);
QObject::connect(m_itemModel.data(), &QAbstractItemModel::dataChanged,
this, &AbstractItemModelHandler::handleDataChanged);
QObject::connect(m_itemModel.data(), &QAbstractItemModel::layoutChanged,
this, &AbstractItemModelHandler::handleLayoutChanged);
QObject::connect(m_itemModel.data(), &QAbstractItemModel::modelReset,
this, &AbstractItemModelHandler::handleModelReset);
QObject::connect(m_itemModel.data(), &QAbstractItemModel::rowsInserted,
this, &AbstractItemModelHandler::handleRowsInserted);
QObject::connect(m_itemModel.data(), &QAbstractItemModel::rowsMoved,
this, &AbstractItemModelHandler::handleRowsMoved);
QObject::connect(m_itemModel.data(), &QAbstractItemModel::rowsRemoved,
this, &AbstractItemModelHandler::handleRowsRemoved);
}
if (!m_resolveTimer.isActive())
m_resolveTimer.start(0);
emit itemModelChanged(itemModel);
}
}
QAbstractItemModel *AbstractItemModelHandler::itemModel() const
{
return m_itemModel.data();
}
void AbstractItemModelHandler::handleColumnsInserted(const QModelIndex &parent,
int start, int end)
{
Q_UNUSED(parent);
Q_UNUSED(start);
Q_UNUSED(end);
// Manipulating columns changes all rows in proxies that map rows/columns directly,
// and its effects are not clearly defined in others -> always do full reset.
if (!m_resolveTimer.isActive()) {
m_fullReset = true;
m_resolveTimer.start(0);
}
}
void AbstractItemModelHandler::handleColumnsMoved(const QModelIndex &sourceParent,
int sourceStart,
int sourceEnd,
const QModelIndex &destinationParent,
int destinationColumn)
{
Q_UNUSED(sourceParent);
Q_UNUSED(sourceStart);
Q_UNUSED(sourceEnd);
Q_UNUSED(destinationParent);
Q_UNUSED(destinationColumn);
// Manipulating columns changes all rows in proxies that map rows/columns directly,
// and its effects are not clearly defined in others -> always do full reset.
if (!m_resolveTimer.isActive()) {
m_fullReset = true;
m_resolveTimer.start(0);
}
}
void AbstractItemModelHandler::handleColumnsRemoved(const QModelIndex &parent,
int start, int end)
{
Q_UNUSED(parent);
Q_UNUSED(start);
Q_UNUSED(end);
// Manipulating columns changes all rows in proxies that map rows/columns directly,
// and its effects are not clearly defined in others -> always do full reset.
if (!m_resolveTimer.isActive()) {
m_fullReset = true;
m_resolveTimer.start(0);
}
}
void AbstractItemModelHandler::handleDataChanged(const QModelIndex &topLeft,
const QModelIndex &bottomRight,
const QList<int> &roles)
{
Q_UNUSED(topLeft);
Q_UNUSED(bottomRight);
Q_UNUSED(roles);
// Default handling for dataChanged is to do full reset, as it cannot be optimized
// in a general case, where we do not know which row/column/index the item model item
// actually ended up to in the proxy.
if (!m_resolveTimer.isActive()) {
m_fullReset = true;
m_resolveTimer.start(0);
}
}
void AbstractItemModelHandler::handleLayoutChanged(const QList<QPersistentModelIndex> &parents,
QAbstractItemModel::LayoutChangeHint hint)
{
Q_UNUSED(parents);
Q_UNUSED(hint);
// Resolve entire model if layout changes
if (!m_resolveTimer.isActive()) {
m_fullReset = true;
m_resolveTimer.start(0);
}
}
void AbstractItemModelHandler::handleModelReset()
{
// Data cleared, reset array
if (!m_resolveTimer.isActive()) {
m_fullReset = true;
m_resolveTimer.start(0);
}
}
void AbstractItemModelHandler::handleRowsInserted(const QModelIndex &parent, int start, int end)
{
Q_UNUSED(parent);
Q_UNUSED(start);
Q_UNUSED(end);
// Default handling for rowsInserted is to do full reset, as it cannot be optimized
// in a general case, where we do not know which row/column/index the item model item
// actually ended up to in the proxy.
if (!m_resolveTimer.isActive()) {
m_fullReset = true;
m_resolveTimer.start(0);
}
}
void AbstractItemModelHandler::handleRowsMoved(const QModelIndex &sourceParent,
int sourceStart,
int sourceEnd,
const QModelIndex &destinationParent,
int destinationRow)
{
Q_UNUSED(sourceParent);
Q_UNUSED(sourceStart);
Q_UNUSED(sourceEnd);
Q_UNUSED(destinationParent);
Q_UNUSED(destinationRow);
// Default handling for rowsMoved is to do full reset, as it cannot be optimized
// in a general case, where we do not know which row/column/index the item model item
// actually ended up to in the proxy.
if (!m_resolveTimer.isActive()) {
m_fullReset = true;
m_resolveTimer.start(0);
}
}
void AbstractItemModelHandler::handleRowsRemoved(const QModelIndex &parent, int start, int end)
{
Q_UNUSED(parent);
Q_UNUSED(start);
Q_UNUSED(end);
// Default handling for rowsRemoved is to do full reset, as it cannot be optimized
// in a general case, where we do not know which row/column/index the item model item
// actually ended up to in the proxy.
if (!m_resolveTimer.isActive()) {
m_fullReset = true;
m_resolveTimer.start(0);
}
}
void AbstractItemModelHandler::handleMappingChanged()
{
if (!m_resolveTimer.isActive())
m_resolveTimer.start(0);
}
void AbstractItemModelHandler::handlePendingResolve()
{
resolveModel();
m_fullReset = false;
}
QT_END_NAMESPACE