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/*
modelcontentproxymodel.cpp
This file is part of GammaRay, the Qt application inspection and manipulation tool.
SPDX-FileCopyrightText: 2015 Klarälvdalens Datakonsult AB, a KDAB Group company <info@kdab.com>
Author: Volker Krause <volker.krause@kdab.com>
SPDX-License-Identifier: GPL-2.0-or-later
Contact KDAB at <info@kdab.com> for commercial licensing options.
*/
#include "modelcontentproxymodel.h"
#include <QDebug>
#include <QItemSelectionModel>
using namespace GammaRay;
ModelContentProxyModel::ModelContentProxyModel(QObject *parent)
: QIdentityProxyModel(parent)
, m_selectionModel(nullptr)
{
}
ModelContentProxyModel::~ModelContentProxyModel() = default;
void ModelContentProxyModel::setSourceModel(QAbstractItemModel *model)
{
setSelectionModel(nullptr);
QIdentityProxyModel::setSourceModel(model);
}
void ModelContentProxyModel::setSelectionModel(QItemSelectionModel *selectionModel)
{
Q_ASSERT(!selectionModel || selectionModel->model() == sourceModel());
if (m_selectionModel == selectionModel)
return;
if (m_selectionModel) {
disconnect(m_selectionModel.data(), &QItemSelectionModel::selectionChanged, this, &ModelContentProxyModel::selectionChanged);
emitDataChangedForSelection(m_selectionModel->selection());
}
m_selectionModel = selectionModel;
if (m_selectionModel) {
connect(m_selectionModel.data(), &QItemSelectionModel::selectionChanged, this, &ModelContentProxyModel::selectionChanged);
emitDataChangedForSelection(m_selectionModel->selection());
}
}
QVariant ModelContentProxyModel::data(const QModelIndex &proxyIndex, int role) const
{
// we override this below, so convey enabled state via a custom role
// since disabled is less common then enabled, only transfer disabled states
if (role == DisabledRole) {
if (QIdentityProxyModel::flags(proxyIndex) & Qt::ItemIsEnabled)
return QVariant();
return true;
}
if (role == SelectedRole) {
if (m_selectionModel && m_selectionModel->isSelected(mapToSource(proxyIndex)))
return true;
return QVariant();
}
// we set the EmptyNameRole to signal this index is unnamed to the delegate
if (role == IsDisplayStringEmptyRole) {
return QIdentityProxyModel::data(proxyIndex, Qt::DisplayRole).toString().isNull();
}
return QIdentityProxyModel::data(proxyIndex, role);
}
Qt::ItemFlags ModelContentProxyModel::flags(const QModelIndex &index) const
{
const auto f = QIdentityProxyModel::flags(index);
if (!index.isValid())
return f;
return f | Qt::ItemIsEnabled | Qt::ItemIsSelectable; // always enable items for inspection
}
QMap<int, QVariant> ModelContentProxyModel::itemData(const QModelIndex &index) const
{
auto d = QIdentityProxyModel::itemData(index);
auto v = data(index, DisabledRole);
if (!v.isNull())
d.insert(DisabledRole, v);
v = data(index, SelectedRole);
if (!v.isNull())
d.insert(SelectedRole, v);
v = data(index, IsDisplayStringEmptyRole);
if (!v.isNull())
d.insert(IsDisplayStringEmptyRole, v);
return d;
}
void ModelContentProxyModel::emitDataChangedForSelection(const QItemSelection &selection)
{
for (const auto &range : selection) {
if (!range.isValid())
continue;
emit dataChanged(range.topLeft(), range.bottomRight());
}
}
void ModelContentProxyModel::selectionChanged(const QItemSelection &selected, const QItemSelection &deselected)
{
emitDataChangedForSelection(deselected);
emitDataChangedForSelection(selected);
}
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