// 用新树的根节点替换旧树的根节点
public static UITree replaceRootTreeNode(UITree newTree, UITree oldTree) {
UITreeNode newRootNode = null;
for (UIComponent child : newTree.getChildren()) {
if (child instanceof UITreeNode) {
newRootNode = (UITreeNode) child;
break;
}
}
if (newRootNode != null) {
for (UIComponent child : oldTree.getChildren()) {
if (child instanceof UITreeNode) {
oldTree.getChildren().remove(child);
break;
}
}
oldTree.getChildren().add(newRootNode);
}
return oldTree;
}
private static Integer getIndexParam(FacesContext context, UITree tree) {
Map<String, Object> sessionmap = context.getExternalContext().getSessionMap();
String nodeIndexParam = tree.getClientId(context) + "_" + NODE_INDEX_KEY;
if (sessionmap.get(nodeIndexParam) == null) {
sessionmap.put(nodeIndexParam, 1);
return 0;
} else {
int index = Integer.parseInt(sessionmap.get(nodeIndexParam).toString());
sessionmap.put(nodeIndexParam, index + 1);
return index;
}
}
// 根据用户绑定的TreeDataProvider以及tree的一些属性来生成组件树
public static void buildNodesByCondition(
UITree tree,
TreeDataProvider dataProvider,
UIComponent parent,
Object parentUserData,
Boolean expandAll) {
Object[] children = dataProvider.getChildren(parentUserData);
if (children == null) {
return;
}
for (Object child : children) {
UITreeNode newNode = new UITreeNode();
newNode.setUpdateAble(true);
newNode.setId(TreeRenderHelper.createUniqueTreeNodeId(tree));
newNode.setText(dataProvider.getText(child));
String icon = dataProvider.getIcon(child);
if (icon != null) {
newNode.setIcon(icon);
} else {
newNode.setIconCls(TREE_NODE_BLANK_IMG_CLASS);
}
newNode.setChecked(dataProvider.isChecked(child));
newNode.setExpanded(dataProvider.isExpanded(child));
newNode.setCascade(dataProvider.isCascade(child));
newNode.setHref(dataProvider.getHref(child));
newNode.setHrefTarget(dataProvider.getHrefTarget(child));
newNode.setUserData(child);
Object[] childChildren = dataProvider.getChildren(child);
if (childChildren == null || childChildren.length == 0) {
newNode.setLeaf(true);
} else {
newNode.setLeaf(false);
}
if (parent instanceof UITree) {
((UITree) parent).add(newNode);
}
if (parent instanceof UITreeNode) {
((UITreeNode) parent).add(newNode);
}
if (expandAll) {
buildNodesByCondition(tree, dataProvider, newNode, child, expandAll);
}
}
}
// 保存树组件的状态
public static void saveComponentTree(UITree tree) {
FacesContext context = FacesContext.getCurrentInstance();
Map<String, Object> sessionmap = context.getExternalContext().getSessionMap();
sessionmap.put(tree.getClientId(context) + DELEGATE_KEY, tree);
}
// 创建树组件上唯一的id
public static String createUniqueTreeNodeId(UITree tree) {
FacesContext context = FacesContext.getCurrentInstance();
return tree.getId() + "_" + getIndexParam(context, tree).toString();
}