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return optional from model traverse callback

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Allows callers to stop traversing model when they are done processing
This commit is contained in:
Jussi Kuokkanen 2023-08-31 20:38:22 +03:00
parent c67eaa00f2
commit b6ed9b2e7c
3 changed files with 15 additions and 13 deletions
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11
src/tuxclocker-qt/Utils.cpp
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@ -20,16 +20,17 @@ QVariant fromAssignmentArgument(TuxClocker::Device::AssignmentArgument arg) {
return QVariant{};
}
using ModelTraverseCallback =
std::function<QModelIndex(QAbstractItemModel *, const QModelIndex &, int)>;
void traverseModel(
const ModelTraverseCallback &cb, QAbstractItemModel *model, const QModelIndex &parent) {
for (int i = 0; i < model->rowCount(parent); i++) {
auto nextOpt = cb(model, parent, i);
if (!nextOpt.has_value())
// Returning nothing is used as indication we should stop traversing
return;
// We get the next index we should traverse, and the funtion does
// its thing with the model and index
auto nextIndex = cb(model, parent, i);
auto nextIndex = nextOpt.value();
if (model->hasChildren(nextIndex)) {
traverseModel(cb, model, nextIndex);
}

2
src/tuxclocker-qt/Utils.hpp
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@ -5,7 +5,7 @@
namespace Utils {
using ModelTraverseCallback =
std::function<QModelIndex(QAbstractItemModel *, const QModelIndex &, int)>;
std::function<std::optional<QModelIndex>(QAbstractItemModel *, const QModelIndex &, int)>;
void traverseModel(
const ModelTraverseCallback &, QAbstractItemModel *, const QModelIndex &parent = QModelIndex());

15
src/tuxclocker-qt/data/DeviceModelDelegate.cpp
View File

@ -162,28 +162,29 @@ void DeviceModelDelegate::setAssignableData(
}
bool DeviceModelDelegate::subtreeHasAssignableDefaults(
QAbstractItemModel *model, const QModelIndex &item) {
QAbstractItemModel *model, const QModelIndex &index) {
QSettings settings{"tuxclocker"};
settings.beginGroup("assignableDefaults");
bool hasDefaults = false;
auto cb = [&settings, &hasDefaults](
QAbstractItemModel *model, const QModelIndex &index, int row) {
auto cb = [&settings, &hasDefaults](QAbstractItemModel *model, const QModelIndex &index,
int row) -> std::optional<const QModelIndex> {
auto ifaceIndex = model->index(row, DeviceModel::InterfaceColumn, index);
auto assProxyV = ifaceIndex.data(DeviceModel::AssignableProxyRole);
qDebug() << model->index(row, DeviceModel::NameColumn, index).data();
auto name = model->index(row, DeviceModel::NameColumn, index).data();
if (assProxyV.isValid()) {
auto nodePath = qvariant_cast<AssignableProxy *>(assProxyV)->dbusPath();
if (settings.contains(nodePath.replace('/', '-'))) {
// TODO: break out of the function here
// This stops traversing model
hasDefaults = true;
return std::nullopt;
}
}
return model->index(row, DeviceModel::NameColumn, index);
};
Utils::traverseModel(cb, model);
auto nameIndex = model->index(index.row(), DeviceModel::NameColumn, index.parent());
Utils::traverseModel(cb, model, nameIndex);
return hasDefaults;
}