Page MenuHomePhorge
Files F2577134

kazv-abstract-list-model.cpp
No OneTemporary
Actions

Size
2 KB
Referenced Files
None
Subscribers
None

kazv-abstract-list-model.cpp
View Options

/*
* This file is part of kazv.
* SPDX-FileCopyrightText: 2020-2024 tusooa <tusooa@kazv.moe>
* SPDX-License-Identifier: AGPL-3.0-or-later
*/
#include <kazv-defs.hpp>
#include <QTimer>
#include <lager/constant.hpp>
#include "kazv-abstract-list-model.hpp"
KazvAbstractListModel::KazvAbstractListModel(lager::reader<int> countArg, InitMethod initMethod, QObject *parent)
: QAbstractListModel(parent)
, m_internalCount(0)
{
connect(this, &KazvAbstractListModel::countChanged, this, &KazvAbstractListModel::updateInternalCount);
initCountCursor(countArg, initMethod);
}
KazvAbstractListModel::KazvAbstractListModel(QObject *parent)
: QAbstractListModel(parent)
, m_internalCount(0)
, LAGER_QT(count)(lager::make_constant(0))
{
connect(this, &KazvAbstractListModel::countChanged, this, &KazvAbstractListModel::updateInternalCount);
}
KazvAbstractListModel::~KazvAbstractListModel() = default;
void KazvAbstractListModel::initCountCursor(lager::reader<int> countArg, InitMethod initMethod)
{
LAGER_QT(count) = countArg;
if (initMethod == InitNow) {
m_internalCount = count();
} else {
// The following is taken from MatrixRoomTimeline.
// HACK: If internally the count is set to its full count at the beginning,
// ListView will instantiate everything in the timeline.
// I don't know why it is the case, so I keep the internal count as 0
// when it is constructed, and update it in the next tick.
QTimer::singleShot(0, this, [this] { Q_EMIT countChanged(count()); });
}
}
QVariant KazvAbstractListModel::data(const QModelIndex &/* index */, int /* role */) const
{
return QVariant();
}
int KazvAbstractListModel::rowCount(const QModelIndex &parent) const
{
if (parent.isValid()) {
return 0;
} else {
return m_internalCount;
}
}
void KazvAbstractListModel::updateInternalCount()
{
auto curCount = count();
auto oldCount = m_internalCount;
auto diff = std::abs(curCount - oldCount);
if (curCount > oldCount) {
beginInsertRows(QModelIndex(), 0, diff - 1);
m_internalCount = curCount;
endInsertRows();
} else if (curCount < oldCount) {
beginRemoveRows(QModelIndex(), 0, diff - 1);
m_internalCount = curCount;
endRemoveRows();
}
}

File Metadata

Mime Type
text/x-c
Expires
Tue, Jun 24, 2:51 AM (28 m, 16 s)
Storage Engine
blob
Storage Format
Raw Data
Storage Handle
100566
Default Alt Text
kazv-abstract-list-model.cpp (2 KB)

Event Timeline