Question

我正在尝试在树状视图中实现拖放。我确实做到了。它作品。在三分之一的时间。否则，有时相关事件没有到达，无处可去。

虽然我打了个电话，但我没有看到dragDone事件触发 setDropCompleted(true)事件中的dragDropped。

如果我进行手动测试，我只是看不到事件之间的太多相关性到达和鼠标移动。 dragDropped个事件突然出现，一些单元格收到了 dragEnter/Exit/Over事件，有些则没有，事件源设置为模糊的价值观。

这就是我的测试方式（完整代码请参见DragAndDropTest.java）

@Test
public void
when_the_drag_is_dropped_the_element_is_moved(
    final FxRobot robot
) {
    final ZentaTreeCell startCell = findCellFor(newElement);
    robot.drag(startCell);
    final ZentaTreeCell targetCell = findCellFor(thing);
    final int targetIndex = targetCell.getIndex();
    robot.moveTo(targetCell);
    robot.dropTo(targetCell);
    WaitForAsyncUtils.waitForFxEvents();

    final ZentaTreeCell endCell = findCellFor(newElement);
    assertEquals(targetIndex + 1, endCell.getIndex());
}

以下是我的TreeCell实现的相关行（完整代码为ZentaTreeCell）：

public class ZentaTreeCell extends TreeCell < ZentaElement > {

    public static final DataFormat ZENTA_FORMAT =
    new DataFormat("Zenta Elements");
    private final TreeView < ZentaElement > treeView;

    public ZentaTreeCell(final TreeView < ZentaElement > view) {
        super();
        treeView = view;
        setOnDragDetected((e) - > dragDetected(e));
        setOnDragEntered((e) - > dragEntered(e));
        setOnDragOver((e) - > dragOver(e));
        setOnDragExited((e) - > dragExited(e));
        setOnDragDropped((e) - > dragDropped(e));
        setOnDragDone((e) - > dragDone(e));
    }

    private void dragDone(final DragEvent e) {
        System.out.println("done\n\tat " + this + "\n\t event: " + e);
    }

    private void dragDropped(final DragEvent e) {
        System.out.println("dropped\n\tat " + this + "\n\t event: " + e);
        e.setDropCompleted(true);
        e.getDragboard().clear();
        e.consume();
        getStyleClass().remove("dragtarget");
        final ZentaTreeCell gestureSource = (ZentaTreeCell)
        e.getGestureSource();
        final ZentaTreeCell gestureTarget = (ZentaTreeCell)
        e.getGestureTarget();

        final TreeItem < ZentaElement > draggedItem = gestureSource.getTreeItem();
        final TreeItem < ZentaElement > draggedItemParent =
            draggedItem.getParent();
        final TreeItem < ZentaElement > droppeditem = gestureTarget.getTreeItem();
        final TreeItem < ZentaElement > droppedItemParent =
            droppeditem.getParent();
        final int indexInParent =
            droppedItemParent.getChildren().indexOf(droppeditem);
        draggedItemParent.getChildren().remove(draggedItem);
        droppedItemParent.getChildren().add(indexInParent + 1, draggedItem);
        treeView.getSelectionModel().select(draggedItem);
    }

    private void dragOver(final DragEvent e) {
        System.out.println("over\n\tat " + this + "\n\t event: " + e);
        e.acceptTransferModes(TransferMode.MOVE);
        e.consume();
    }

    private void dragEntered(final DragEvent e) {
        System.out.println("entered\n\tat " + this + "\n\t event: " + e);
        getStyleClass().add("dragtarget");
        e.consume();
    }

    private void dragExited(final DragEvent e) {
        System.out.println("exited\n\tat " + this + "\n\t event: " + e);
        getStyleClass().remove("dragtarget");
        e.consume();
    }

    public void dragDetected(final MouseEvent e) {
        System.out.println("detected\n\tat " + this + "\n\t event: " + e);
        System.out.println("dragDetected");
        final Dragboard dragBoard = startDragAndDrop(TransferMode.MOVE);
        final Map < DataFormat, Object > map = new HashMap < > ();
        final ZentaElement item = getItem();
        map.put(ZENTA_FORMAT, item);
        System.out.println("item: " + item);
        dragBoard.setContent(map);

        e.consume();
    }

}

我想我在这里错过了一些东西，但是阅读了所有有关拖放的文档，我看不到。

javafx 11随机触发事件吗？

0 个答案: