TreeView

创建TreeView和TreeItem

TreeView<String> treeView = new TreeView<>();  
treeView.setLayoutX(100);  
treeView.setLayoutY(100);  
TreeItem<String> china = new TreeItem<>("中国");  
TreeItem<String> hlj = new TreeItem<>("黒龙江");  
TreeItem<String> heb = new TreeItem<>("哈尔滨");  
TreeItem<String> jms = new TreeItem<>("佳木斯");  
TreeItem<String> dq = new TreeItem<>("大庆");  
hlj.getChildren().addAll(heb, jms, dq);  
TreeItem<String> gd = new TreeItem<>("广东");  
TreeItem<String> zj = new TreeItem<>("珠海");  
TreeItem<String> sz = new TreeItem<>("深圳");  
TreeItem<String> dg = new TreeItem<>("东莞");  
gd.getChildren().addAll(zj, sz, dg);  
TreeItem<String> tw = new TreeItem<>("台湾");  
TreeItem<String> tb = new TreeItem<>("台北");  
TreeItem<String> gx = new TreeItem<>("高雄");  
TreeItem<String> tn = new TreeItem<>("台南");  
tw.getChildren().addAll(tb, gx, tn);  
china.getChildren().addAll(hlj, gd, tw);  
treeView.setRoot(china);

设置默认展开

china.setExpanded(true);  
hlj.setExpanded(true);  
gd.setExpanded(true);  
tw.setExpanded(true);

设置宽高

treeView.setPrefWidth(300);  
treeView.setPrefHeight(100);

设置单元格尺寸treeView.setFixedCellSize(40);
设置多选treeView.getSelectionModel().setSelectionMode(SelectionMode.MULTIPLE);

设置可编辑

treeView.setEditable(true);  
// treeView.setCellFactory(TextFieldTreeCell.forTreeView());
treeView.setCellFactory(TextFieldTreeCell.forTreeView(new StringConverter<String>() {  
    @Override  
    public String toString(String object) {  
        return object + " - china";  
    }  
    @Override  
    public String fromString(String string) {  
        return string;  
    }  
}));

滚动监听

treeView.setOnScrollTo(event -> {  
    System.out.println("scroll to " + event.getScrollTarget());  
});

选择监听

treeView.getSelectionModel().selectedItemProperty().addListener((observable, oldValue, newValue) -> {  
    System.out.println("selectedItemProperty: " + newValue);  
});

滚动到指定位置treeView.scrollTo(6);
修改值china.setValue("种花家");
是否显示根节点（隐藏）treeView.setShowRoot(false);
是否是叶子节点china.isLeaf()

获得该节点的前后节点

System.out.println("jms.previousSibling().getValue() = " + jms.previousSibling().getValue());  
System.out.println("jms.nextSibling().getValue() = " + jms.nextSibling().getValue());  
System.out.println("jms.previousSibling(dq).getValue() = " + jms.previousSibling(dq).getValue());  
System.out.println("tw.previousSibling().getValue() = " + tw.previousSibling().getValue());

获取父节点jms.getParent().getValue()
是否展开tw.isExpanded()

聚焦

treeView.getFocusModel().focus(0);  
treeView.requestFocus();

展开的数量treeView.getExpandedItemCount()

# TreeView

TreeView