ensemble.control.PopoverTreeList Maven / Gradle / Ivy
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package ensemble.control;
import ensemble.EnsembleApp;
import javafx.event.EventHandler;
import javafx.geometry.Bounds;
import javafx.scene.control.ListCell;
import javafx.scene.control.ListView;
import javafx.scene.image.Image;
import javafx.scene.image.ImageView;
import javafx.scene.input.MouseEvent;
import javafx.util.Callback;
/**
* Special ListView designed to look like "Text... >" tree list. Perhaps we ought to have customized
* a TreeView instead of a ListView (as the TreeView already has the data model all defined).
*
* This implementation minimizes classes by just having the PopoverTreeList implementing everything
* (it is the Control, the Skin, and the CellFactory all in one).
*/
public class PopoverTreeList extends ListView implements Callback, ListCell> {
protected static final Image RIGHT_ARROW = new Image(
EnsembleApp.class.getResource("images/popover-arrow.png").toExternalForm());
public PopoverTreeList(){
getStyleClass().clear();
setCellFactory(this);
}
@Override public ListCell call(ListView p) {
return new TreeItemListCell();
}
protected void itemClicked(T item) {}
private class TreeItemListCell extends ListCell implements EventHandler {
private ImageView arrow = new ImageView(RIGHT_ARROW);
private TreeItemListCell() {
super();
getStyleClass().setAll("popover-tree-list-cell");
setOnMouseClicked(this);
}
@Override public void handle(MouseEvent t) {
itemClicked(getItem());
}
@Override protected double computePrefWidth(double height) {
return 100;
}
@Override protected double computePrefHeight(double width) {
return 44;
}
@Override protected void layoutChildren() {
if (getChildren().size() < 2) getChildren().add(arrow);
super.layoutChildren();
final int w = (int)getWidth();
final int h = (int)getHeight();
final int centerX = (int)(w/2d);
final int centerY = (int)(h/2d);
final Bounds arrowBounds = arrow.getLayoutBounds();
arrow.setLayoutX(w - arrowBounds.getWidth() - 12);
arrow.setLayoutY((int)((h - arrowBounds.getHeight())/2d));
}
// CELL METHODS
@Override protected void updateItem(T item, boolean empty) {
// let super do its work
super.updateItem(item,empty);
// update our state
if (item == null) { // empty item
setText(null);
arrow.setVisible(false);
} else {
setText(item.toString());
arrow.setVisible(true);
}
}
}
}