JTree:为各个组设置自定义打开/关闭图标
ehs*_*n7b 2 java icons swing jtree treecellrenderer
- 我知道如何在JTree中设置自定义叶图标
- 我知道如何为所有组节点设置自定义关闭/打开图标
但我无法根据组节点名称设置自定义打开/关闭图标,例如节点可以称为电子邮件(因此有一个包络图标很好)或者一组可能被称为任务等等.
我试图通过重写getTreeCellRendererComponent类的方法来做到这一点DefaultTreeCellRenderer
但是改变icon当前的电流node只会影响下一个节点!
如何为各个组设置自定义打开/关闭图标？
请看一下我的代码:
Employee.java
package com.ehsunbehravesh.swing;
import java.util.Random;
public class Employee {
public String name;
public int id;
public boolean isBoss;
public Employee[] employees;
public Employee(String name, boolean isBoss) {
this.name = name;
this.isBoss = isBoss;
this.id = new Random(System.currentTimeMillis()).nextInt(Integer.MAX_VALUE);
}
@Override
public String toString() {
return this.name;
}
static String randomName() {
String chars = "abcdefghijklmnopqrstuvwxyz";
StringBuilder builder = new StringBuilder();
Random r = new Random(System.currentTimeMillis());
int length = r.nextInt(10) + 1;
for (int i = 0; i < length; i++) {
builder.append(chars.charAt(r.nextInt(chars.length())));
}
return builder.toString();
}
}
CustomTreeNode.java
package com.ehsunbehravesh.swing;
import javax.swing.ImageIcon;
import javax.swing.tree.DefaultMutableTreeNode;
public class CustomTreeNode extends DefaultMutableTreeNode {
/**
* The icon which is displayed on the JTree object. open, close, leaf icon.
*/
private ImageIcon icon;
public CustomTreeNode(ImageIcon icon) {
this.icon = icon;
}
public CustomTreeNode(ImageIcon icon, Object userObject) {
super(userObject);
this.icon = icon;
}
public CustomTreeNode(ImageIcon icon, Object userObject, boolean allowsChildren) {
super(userObject, allowsChildren);
this.icon = icon;
}
public ImageIcon getIcon() {
return icon;
}
public void setIcon(ImageIcon icon) {
this.icon = icon;
}
}
CustomeTreeCellRenderer.java
package com.ehsunbehravesh.swing;
import java.awt.Component;
import javax.swing.JTree;
import javax.swing.tree.DefaultTreeCellRenderer;
class CustomeTreeCellRenderer extends DefaultTreeCellRenderer {
public CustomeTreeCellRenderer() {
}
@Override
public Component getTreeCellRendererComponent(JTree tree, Object value, boolean selected, boolean expanded, boolean leaf, int row, boolean hasFocus) {
super.getTreeCellRendererComponent(tree, value, leaf, expanded, leaf, row, hasFocus);
if (!leaf) {
CustomTreeNode node = (CustomTreeNode) value;
System.out.println(((Employee) node.getUserObject()).name);
if (node.getIcon() != null) {
System.out.println(node.getIcon().toString());
setClosedIcon(node.getIcon());
setOpenIcon(node.getIcon());
} else {
setClosedIcon(getDefaultClosedIcon());
setClosedIcon(getDefaultOpenIcon());
setOpenIcon(getDefaultOpenIcon());
}
}
return this;
}
}
Test1.java
package com.ehsunbehravesh.swing;
import java.awt.BorderLayout;
import java.awt.Color;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JPanel;
import javax.swing.JTree;
import javax.swing.tree.DefaultTreeModel;
class TreeSample {
public static void main(String args[]) {
JFrame f = new JFrame("JTree Sample");
f.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
JPanel pnlMain = new JPanel(new BorderLayout());
pnlMain.setBackground(Color.white);
createTree(pnlMain);
f.setContentPane(pnlMain);
f.setSize(300, 200);
f.setVisible(true);
}
private static void createTree(JPanel pnlMain) {
Employee bigBoss = new Employee(Employee.randomName(), true);
Employee[] level1 = new Employee[5];
bigBoss.employees = level1;
for (int i = 0; i < level1.length; i++) {
level1[i] = new Employee(Employee.randomName(), true);
}
for (int i = 0; i < level1.length; i++) {
Employee employee = level1[i];
if (employee.isBoss) {
int count = 5;
employee.employees = new Employee[count];
for (int j = 0; j < employee.employees.length; j++) {
employee.employees[j] = new Employee(Employee.randomName(), false);
}
}
}
CustomTreeNode root = new CustomTreeNode(new ImageIcon("images/Circle_3.gif"), bigBoss);
DefaultTreeModel model = new DefaultTreeModel(root);
for (Employee employee : bigBoss.employees) {
CustomTreeNode boss = new CustomTreeNode(new ImageIcon("images/Circle_2.gif"), employee);
root.add(boss);
if (employee.isBoss) {
for (Employee employee1 : employee.employees) {
CustomTreeNode emp = new CustomTreeNode(new ImageIcon("images/Circle_1.gif"), employee1);
boss.add(emp);
}
}
}
JTree tree = new JTree(model);
tree.setCellRenderer(new CustomeTreeCellRenderer());
pnlMain.add(tree, BorderLayout.CENTER);
}
}
tra*_*god 10
在您的工作中TreeCellRenderer,您可以根据需要使用setOpenIcon()与setClosedIcon()您的模型相关的已定义参数和谓词.给定具有默认JTree模型的树,TreeRenderer下面将使用节点的closed和open图标sports:
private static class TreeRenderer extends DefaultTreeCellRenderer {
private static final Icon closed =
(Icon) UIManager.get("InternalFrame.maximizeIcon");
private static final Icon open =
(Icon) UIManager.get("InternalFrame.minimizeIcon");
@Override
public Component getTreeCellRendererComponent(JTree tree, Object value,
boolean sel, boolean exp, boolean leaf, int row, boolean hasFocus) {
DefaultMutableTreeNode node = (DefaultMutableTreeNode) value;
String s = node.getUserObject().toString();
if ("sports".equals(s)) {
setOpenIcon(open);
setClosedIcon(closed);
} else {
setOpenIcon(getDefaultOpenIcon());
setClosedIcon(getDefaultClosedIcon());
}
super.getTreeCellRendererComponent(
tree, value, sel, exp, leaf, row, hasFocus);
return this;
}
}
另请参见此相关示例.
运行代码之后,您尝试加载的图像似乎"意味着"嵌入到您的应用程序中(也就是说,它们不会驻留在应用程序上下文的磁盘外的某些位置).
所以不要这样做......
CustomTreeNode root = new CustomTreeNode(new ImageIcon("images/Circle_3.gif"), bigBoss);
尝试做这样的事......
CustomTreeNode root = new CustomTreeNode(new ImageIcon(ImageIO.read(getClass().getResource("/images/Circle_3.gif"))), bigBoss);
代替.这将使Java在其类路径(包括任何JAR资源)中查找以查找图像.
当我运行没有此修复程序的代码时,没有任何工作,当我更新它以使用此功能时,它工作正常.
NB:ImageIO#read抛出一个IOException如此注意它
更新
经过多次刮擦......我改变了细胞渲染器,看起来像这样......
class CustomeTreeCellRenderer extends DefaultTreeCellRenderer {
public CustomeTreeCellRenderer() {
}
@Override
public Component getTreeCellRendererComponent(JTree tree, Object value, boolean selected, boolean expanded, boolean leaf, int row, boolean hasFocus) {
// if (!leaf) {
CustomTreeNode node = (CustomTreeNode) value;
if (node.getIcon() != null) {
System.out.println(node + " - " + node.getIcon());
setClosedIcon(node.getIcon());
setOpenIcon(node.getIcon());
setLeafIcon(node.getIcon());
} else {
System.out.println(node + " - default");
setClosedIcon(getDefaultClosedIcon());
setLeafIcon(getDefaultLeafIcon());
setOpenIcon(getDefaultOpenIcon());
}
// }
super.getTreeCellRendererComponent(tree, value, selected, expanded, leaf, row, hasFocus);
return this;
}
}
它清除了一切......
调用setXxxIcon不会影响当前渲染器,但会影响将来的渲染器.那是.如果你setOpenIcon已经调用了AFTER super.getTreeCellRendererComponent,它将不会影响当前的渲染器,但它会影响下一次调用,super.getTreeCellRendererComponent因为set方法只是设置类变量的值.
额外
Trashgod对依赖于实施及其现在的运作方式做出了有价值的评论.
实际上,您应该根据传递给它的参数使用所需的图标,而不是DefaultTreeCellRenderer#setXxxIcon在getTreeCellRendererComponent方法中调用DefaultTreeCellRenderer#setIcon.
这意味着您可以super.getTreeCellRendererComponent先调用,然后覆盖其后的图标行为.
您还可以获取对Object值的引用并覆盖DefaultTreeCellRenderer#getXxxIcon方法,并根据值更改这些方法的返回值.我个人而言,因为它改变了渲染器的记录行为,所以不会勇敢