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| /* | ||
| Copyright (C) 2018-2019 Andres Castellanos | ||
| This program is free software: you can redistribute it and/or modify | ||
| it under the terms of the GNU General Public License as published by | ||
| the Free Software Foundation, either version 3 of the License, or | ||
| (at your option) any later version. | ||
| This program is distributed in the hope that it will be useful, | ||
| but WITHOUT ANY WARRANTY; without even the implied warranty of | ||
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | ||
| GNU General Public License for more details. | ||
| You should have received a copy of the GNU General Public License | ||
| along with this program. If not, see <https://www.gnu.org/licenses/> | ||
| */ | ||
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| package vsim.gui.components; | ||
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| import java.util.LinkedHashSet; | ||
| import javafx.scene.control.TableRow; | ||
| import javafx.scene.control.TableView; | ||
| import javafx.util.Callback; | ||
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| /** | ||
| * Extra calls for TableView which would have been nice to see in JavaFx TableView | ||
| */ | ||
| public class TableViewExt<T> { | ||
|
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| /** table view to extend */ | ||
| private final TableView<T> tableView; | ||
| /** table view rows */ | ||
| private LinkedHashSet<TableRow<T>> rows = new LinkedHashSet<>(); | ||
| /** table view first index */ | ||
| private int firstIndex; | ||
| /** table view last index */ | ||
| private int lastIndex; | ||
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| /** | ||
| * Initializes a new table view extension. | ||
| * | ||
| * @param tableView table view to extend | ||
| */ | ||
| public TableViewExt(TableView<T> tableView) { | ||
| this.tableView = tableView; | ||
| // Callback to monitor row creation and to identify visible screen rows | ||
| final Callback<TableView<T>, TableRow<T>> rf = tableView.getRowFactory(); | ||
| // modify row factory | ||
| final Callback<TableView<T>, TableRow<T>> modifiedRowFactory = param -> { | ||
| TableRow<T> r = rf != null ? rf.call(param) : new TableRow<T>(); | ||
| // Save row, this implementation relies on JaxaFX re-using TableRow efficiently | ||
| rows.add(r); | ||
| return r; | ||
| }; | ||
| tableView.setRowFactory(modifiedRowFactory); | ||
| } | ||
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| /** recomputes table view first visible and last visible cells indexes */ | ||
| private void recomputeVisibleIndexes() { | ||
| firstIndex = -1; | ||
| lastIndex = -1; | ||
| // Work out which of the rows are visible | ||
| double tblViewHeight = tableView.getHeight(); | ||
| double headerHeight = tableView.lookup(".column-header-background").getBoundsInLocal().getHeight(); | ||
| double viewPortHeight = tblViewHeight - headerHeight; | ||
| for (TableRow<T> r : rows) { | ||
| double minY = r.getBoundsInParent().getMinY(); | ||
| double maxY = r.getBoundsInParent().getMaxY(); | ||
| boolean hidden = (maxY < 0) || (minY > viewPortHeight); | ||
| if (!hidden) { | ||
| if (firstIndex < 0 || r.getIndex() < firstIndex) | ||
| firstIndex = r.getIndex(); | ||
| if (lastIndex < 0 || r.getIndex() > lastIndex) | ||
| lastIndex = r.getIndex(); | ||
| } | ||
| } | ||
| } | ||
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| /** | ||
| * Find the first row in the table view which is visible on the display. | ||
| * | ||
| * @return -1 if none visible or the index of the first visible row (wholly or fully) | ||
| */ | ||
| public int getFirstVisibleIndex() { | ||
| recomputeVisibleIndexes(); | ||
| return firstIndex; | ||
| } | ||
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| /** | ||
| * Find the last row in the table view which is visible on the display. | ||
| * | ||
| * @return -1 if none visible or the index of the last visible row (wholly or fully) | ||
| */ | ||
| public int getLastVisibleIndex() { | ||
| recomputeVisibleIndexes(); | ||
| return lastIndex; | ||
| } | ||
|
|
||
| } |
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