我有一个JXTreeTable，左侧有一个节点树（不同的数据类型），右侧有一个网格（默认情况下）。
现在我希望所有显示的值（也是树字幕）都取自getValueAt（row，column）方法，而不是树节点通过它们的toString（）方法呈现
如何强制JXTreeTable不采用特定于类的toString（）并使用getValueAt（...）返回的值？
谢谢！
这是我的模特：
public class TreeTableGroupTreeTableModel extends AbstractTreeTableModel {
private final static String[] COLUMN_NAMES = { "Tree",
"Add/Edit", "Remove" };
//Group-Hierarchy:
private JXGroup groupRootObject;
public TreeTableGroupTreeTableModel(JXGroup groupRoot) {
this.groupRootObject = groupRoot;
}
// Here is my structure:
//GROUP 1-1 ModuleAggregation 1-* Modules 1-1 JXGroupAccessMemberAggregation 1-* JXGroupAccessSimpleUserObjectLeaf
/**
* Returns the value for the node at columnIndex. The node must be managed
* by this model. Unamanaged nodes should throw an IllegalArgumentException.
*
*
* node - the node whose value is to be queried column - the column whose
* value is to be queried
*/
@Override
public Object getValueAt(Object node, int column) {
System.out.println(node.getClass());
if (node instanceof JXGroup) {
switch (column) {
case 0:
return "this should render this string instead of the class tostring()";//((JXGroup) node);
case 1:
case 2:
return "";
}
} else if (node instanceof JXGroupAccessModuleAggregation) {
switch (column) {
case 0:
return "Modules";
case 1:
return "ADD";
case 2:
return "REMOVE ALL";
}
} else if (node instanceof JXGroupAccessModule) {
switch (column) {
case 0:
return ((JXGroupAccessModule) node).getModule();
case 1:
return "ADD";
case 2:
return "REMOVE";
}
} else if (node instanceof JXGroupAccessMemberAggregation) {
switch (column) {
case 0:
return "Members";
case 1:
return "ADD";
case 2:
return "REMOVE ALL";
}
} else if (node instanceof JXGroupAccessSimpleUserObjectLeaf) {
switch (column) {
case 0:
SimpleUserObject c = FunctionsUser.getUser(
metaDataPackage.getUsers(),
((JXGroupAccessSimpleUserObjectLeaf) node).getUserId().getId());
return c.getShowAs();
case 1:
return "";
case 2:
return "REMOVE";
}
}
return null;
}
/**
* Sets the value for the node at columnIndex to value. The node must be
* managed by this model. Unamanaged nodes should throw an
* IllegalArgumentException.
*
* value - the new value node - the node whose value is to be changed column
* - the column whose value is to be changed
*/
@Override
public void setValueAt(Object value, Object node, int column) {
return; // changes are not allowed
}
@Override
public Object getRoot() {
return groupRootObject;
}
@Override
public int getColumnCount() {
return COLUMN_NAMES.length;
}
@Override
public String getColumnName(int column) {
return COLUMN_NAMES[column];
}
@Override
public boolean isCellEditable(Object node, int column) {
return false;
}
@Override
public boolean isLeaf(Object node) {
return node instanceof JXGroupAccessCategoryLeaf
|| node instanceof JXGroupAccessChapterLeaf
|| node instanceof JXGroupAccessEntryLeaf
|| node instanceof JXGroupAccessSimpleUserObjectLeaf;
}
@Override
public int getChildCount(Object obj) {
if (!(obj instanceof JXICountable)) {
System.out.println("parsing error. should be JXCountable (but is "
+ obj.getClass() + ")");
return 0;
}
JXICountable obj2 = (JXICountable) obj;
return obj2.getChildrenCount();
}
@Override
public Object getChild(Object parent, int index) {
if (parent instanceof JXITreeNodeAble) {
return ((JXITreeNodeAble) parent).getChild(index);
}
throw new IllegalArgumentException(
"parent is not a member of JXITreeNodeAble");
}
@Override
public int getIndexOfChild(Object parent, Object child) {
if (parent instanceof JXITreeNodeAble) {
return ((JXITreeNodeAble) parent).getIndexOfChild(child);
}
throw new IllegalArgumentException(
"parent is not a member of JXITreeNodeAble");
}
}
答案 0 :(得分：1)
首先请注意，树表是最复杂的组件之一，因为节点必须保留大量数据：
setUserObject(..)和getUserObject()方法保留和检索特定于用户的对象。此外，所有节点都可能保留不同的数据对象，因此问题变得更加复杂。
现在您已经发布了代码以及它所在的source，请注意实现的目的是没有root（您遇到问题的节点）并直接使用域对象来避免处理TreeTableNodes。有一个subsequent post，其中作者修改了它的树表模型实现以包括根节点。说完之后，至少应该修改两件事：
getRoot()方法，并将实施内容与AbstractTreeTableModel保持一致。super构造函数。在代码中：
public class TreeTableGroupTreeTableModel extends AbstractTreeTableModel {
...
// private JXGroup groupRootObject; Not needed!
...
public TreeTableGroupTreeTableModel(JXGroup groupRoot) {
super(groupRoot);
}
...
// @Override
// public Object getRoot() {
// return groupRootObject;
// }
...
}
虽然这可能有用（我没有你所有的课程都无法测试）我想再次强调这种实现树桌模型的方式对我来说并不合适。我不会在第一时间使用树表模型，而是使用DefaultTreeTableModel。我还将为每个需要在树表中表示的域类实现树表节点。例如：
class JXGroupAccessModuleTreeTableNode extends AbstractMutableTreeTableNode {
public JXGroupAccessModuleTreeTableNode(JXGroupAccessModule module) {
super(module);
}
public JXGroupAccessModuleTreeTableNode(JXGroupAccessModule module, boolean allowsChildren) {
super(module, allowsChildren);
}
@Override
public Object getValueAt(int column) {
JXGroupAccessModule module = (JXGroupAccessModule)getUserObject();
switch (column) {
case 0: return module.getModule();
case 1: return "ADD";
case 2: return "REMOVE";
default: throw new ArrayIndexOutOfBoundsException(column);
}
}
@Override
public int getColumnCount() {
return 3;
}
}
要允许细胞可编辑，您还必须同时覆盖setValueAt(Object value, int column)和isEditable(column)方法：默认情况下AbstractMutableTreeTableNodes不可编辑。
按照这种方法，您将获得以下好处：