| 270 | } |
| 271 | |
| 272 | void MultiLevelListView::setLevels(int levels) |
| 273 | { |
| 274 | Q_D(MultiLevelListView); |
| 275 | |
| 276 | qDeleteAll(d->views); |
| 277 | qDeleteAll(d->proxies); |
| 278 | qDeleteAll(d->layouts); |
| 279 | d->views.clear(); |
| 280 | d->proxies.clear(); |
| 281 | d->layouts.clear(); |
| 282 | |
| 283 | d->levels = levels; |
| 284 | d->views.reserve(levels); |
| 285 | d->proxies.reserve(levels); |
| 286 | d->layouts.reserve(levels); |
| 287 | |
| 288 | QTreeView* previousView = nullptr; |
| 289 | for (int i = 0; i < d->levels; ++i) { |
| 290 | auto* levelLayout = new QVBoxLayout(); |
| 291 | |
| 292 | auto* view = new QTreeView(this); |
| 293 | view->setContentsMargins(0, 0, 0, 0); |
| 294 | // only the right-most view is decorated |
| 295 | view->setRootIsDecorated(i + 1 == d->levels); |
| 296 | view->setHeaderHidden(false); |
| 297 | view->setSelectionMode(QAbstractItemView::SingleSelection); |
| 298 | |
| 299 | if (!previousView) { |
| 300 | // the root, i.e. left-most view |
| 301 | auto* root = new RootProxyModel(this); |
| 302 | root->setDynamicSortFilter(true); |
| 303 | d->proxies << root; |
| 304 | root->setSourceModel(d->model); |
| 305 | view->setModel(root); |
| 306 | } else { |
| 307 | auto* subTreeProxy = new SubTreeProxyModel(previousView->selectionModel(), this); |
| 308 | if (i + 1 < d->levels) { |
| 309 | // middle views only show children of selection |
| 310 | subTreeProxy->setFilterBehavior(KSelectionProxyModel::ChildrenOfExactSelection); |
| 311 | } else { |
| 312 | // right-most view shows the rest |
| 313 | subTreeProxy->setFilterBehavior(KSelectionProxyModel::SubTreesWithoutRoots); |
| 314 | } |
| 315 | d->proxies << subTreeProxy; |
| 316 | subTreeProxy->setSourceModel(d->model); |
| 317 | // sorting requires another proxy in-between |
| 318 | auto* sortProxy = new QSortFilterProxyModel(subTreeProxy); |
| 319 | sortProxy->setSourceModel(subTreeProxy); |
| 320 | sortProxy->setDynamicSortFilter(true); |
| 321 | view->setModel(sortProxy); |
| 322 | } |
| 323 | |
| 324 | // view->setModel creates the selection model |
| 325 | connect(view->selectionModel(), &QItemSelectionModel::currentChanged, |
| 326 | this, [this](const QModelIndex& current, const QModelIndex& previous) { |
| 327 | Q_D(MultiLevelListView); |
| 328 | d->viewSelectionChanged(current, previous); |
| 329 | }); |
no test coverage detected