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| package treecheck;
import java.util.function.Function;
import java.util.stream.IntStream;
import javafx.application.Application;
import javafx.application.Platform;
import javafx.beans.property.BooleanProperty;
import javafx.beans.property.SimpleBooleanProperty;
import javafx.beans.value.ChangeListener;
import javafx.beans.value.ObservableValue;
import javafx.collections.FXCollections;
import javafx.collections.MapChangeListener;
import javafx.collections.ObservableMap;
import javafx.scene.Node;
import javafx.scene.Scene;
import javafx.scene.control.CheckBox;
import javafx.scene.control.Label;
import javafx.scene.control.SplitPane;
import javafx.scene.control.TreeCell;
import javafx.scene.control.TreeItem;
import javafx.scene.control.TreeView;
import javafx.scene.layout.Priority;
import javafx.scene.layout.VBox;
import javafx.stage.Stage;
public final class Main extends Application {
private static final short MAX_TREE_DEPTH = 3;
@Override
public void start(final Stage primaryStage) throws Exception {
// Écouteur cellule.
final Label trucTitleLabel = new Label("Écouteur cellule");
final Label trucLabel = new Label();
final TreeView<Truc> trucTreeView = new TreeView(createTree(id -> {
final Truc result = new Truc(id);
result.selectedProperty().addListener((observable, oldValue, newValue) -> {
trucLabel.setText(String.format("%s - %b", result, result.isSelected()));
});
return result;
}));
trucTreeView.setShowRoot(false);
trucTreeView.setCellFactory(tree -> new TrucTreeCell());
VBox.setVgrow(trucTreeView, Priority.ALWAYS);
final VBox trucVBox = new VBox();
trucVBox.getChildren().addAll(trucTitleLabel, trucTreeView, trucLabel);
// Map de sélection.
final Label totoTitleLabel = new Label("Map de sélection");
final Label totoLabel = new Label();
final TreeView<Toto> tototTreeView = new TreeView(createTree(Toto::new));
tototTreeView.setShowRoot(false);
final ObservableMap<Toto, Boolean> totoSelectionMap = FXCollections.observableHashMap();
totoSelectionMap.addListener((MapChangeListener.Change<? extends Toto, ? extends Boolean> change) -> {
totoLabel.setText(String.format("%s - %b", change.getKey(), change.getValueAdded()));
});
tototTreeView.setCellFactory(tree -> new TotoTreeCell(totoSelectionMap));
VBox.setVgrow(tototTreeView, Priority.ALWAYS);
final VBox totoVBox = new VBox();
totoVBox.getChildren().addAll(totoTitleLabel, tototTreeView, totoLabel);
//
final SplitPane root = new SplitPane();
root.getItems().addAll(trucVBox, totoVBox);
final Scene scene = new Scene(root);
primaryStage.setScene(scene);
primaryStage.setWidth(500);
primaryStage.setHeight(800);
primaryStage.show();
Platform.runLater(() -> root.setDividerPositions(0.5));
}
private <T> TreeItem<T> createTree(final Function<String, T> provider) {
final TreeItem<T> root = new TreeItem<>();
populateTree(root, provider, MAX_TREE_DEPTH, "");
return root;
}
private <T> void populateTree(final TreeItem<T> root, final Function<String, T> provider, final int level, final String prefix) {
IntStream.range(0, level)
.mapToObj(index -> String.format("%s %d", prefix, index).trim())
.map(provider::apply)
.map(TreeItem::new)
.forEach(item -> {
populateTree(item, provider, level - 1, item.getValue().toString());
root.getChildren().add(item);
});
root.setExpanded(true);
}
private static final class Truc {
final String id;
public Truc(final String id) {
this.id = id;
}
@Override
public String toString() {
return id;
}
private final BooleanProperty selected = new SimpleBooleanProperty(this, "selected");
public final boolean isSelected() {
return selected.get();
}
public final void setSelected(boolean value) {
selected.set(value);
}
public final BooleanProperty selectedProperty() {
return selected;
}
}
private static final class TrucTreeCell extends TreeCell<Truc> {
private CheckBox renderer = null;
private Truc currentItem;
@Override
protected void updateItem(Truc item, boolean empty) {
super.updateItem(item, empty);
currentItem = item;
String text = null;
Node graphic = null;
if (item != null && !empty) {
final TreeItem treeItem = getTreeItem();
final boolean isLeaf = treeItem.isLeaf();
if (isLeaf) {
renderer = (renderer == null) ? new CheckBox() : renderer;
renderer.selectedProperty().removeListener(selectedChangeListener);
renderer.setText(item.toString());
renderer.setSelected(item.isSelected());
renderer.selectedProperty().addListener(selectedChangeListener);
text = null;
graphic = renderer;
} else {
text = item.toString();
}
}
setText(text);
setGraphic(graphic);
}
private final ChangeListener<Boolean> selectedChangeListener = (observable, oldValue, newValue) -> {
if (currentItem != null) {
currentItem.setSelected(newValue);
}
};
}
private static final class Toto {
final String id;
public Toto(final String id) {
this.id = id;
}
@Override
public String toString() {
return id;
}
}
private static final class TotoTreeCell extends TreeCell<Toto> {
private CheckBox renderer = null;
private Toto currentItem;
final ObservableMap<Toto, Boolean> selectionMap;
public TotoTreeCell(final ObservableMap<Toto, Boolean> selectionMap) {
this.selectionMap = selectionMap;
}
@Override
protected void updateItem(Toto item, boolean empty) {
super.updateItem(item, empty);
currentItem = item;
String text = null;
Node graphic = null;
if (item != null && !empty) {
final TreeItem treeItem = getTreeItem();
final boolean isLeaf = treeItem.isLeaf();
if (isLeaf) {
renderer = (renderer == null) ? new CheckBox() : renderer;
renderer.selectedProperty().removeListener(selectedChangeListener);
renderer.setText(item.toString());
final Boolean selected = selectionMap.get(item);
renderer.setSelected(selected == null ? false : selected);
renderer.selectedProperty().addListener(selectedChangeListener);
text = null;
graphic = renderer;
} else {
text = item.toString();
}
}
setText(text);
setGraphic(graphic);
}
private final ChangeListener<Boolean> selectedChangeListener = new ChangeListener<Boolean>() {
@Override
public void changed(ObservableValue<? extends Boolean> observable, Boolean oldValue, Boolean newValue) {
if (currentItem != null) {
selectionMap.put(currentItem, newValue);
}
}
};
}
public static void Main(String... args) {
Application.launch(args);
}
} |
TreeView avec checkbox seulement sur les leafs
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