Custom JTree cell renderers with custom open/close icons-java技术脚本

Custom JTree cell renderers with custom open/close icons

我想创建一个自定义的 JTree，它的节点是 JProgressBar\\'s 我有这个工作就像我想要的那样

但是你会注意到它缺少了它的打开/关闭图标，我也希望它是一个自定义的 /- 图标，而不是标准的可扩展文件夹。不完全确定我做错了什么(只是在美化代码之前开发这个概念)

package com.testingarea;



import java.awt.Component;

import java.awt.Graphics;

import java.util.HashMap;



import javax.swing.BoxLayout;

import javax.swing.Icon;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.JProgressBar;

import javax.swing.JScrollPane;

import javax.swing.JTree;

import javax.swing.UIManager;

import javax.swing.plaf.IconUIResource;

import javax.swing.tree.DefaultMutableTreeNode;

import javax.swing.tree.DefaultTreeCellRenderer;

import javax.swing.tree.DefaultTreeModel;

import javax.swing.tree.TreeCellRenderer;



public class TestTrees { 



 public static void main(String args[]) { 

  JFrame frame = new JFrame("Tree"); 

  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);



  ProgressTreeCellRenderer renderer = new ProgressTreeCellRenderer();



  JProgressBar progressBar = new JProgressBar(0, 100);

  progressBar.setValue(50);

  progressBar.setStringPainted(true);

  DefaultMutableTreeNode top =

    new DefaultMutableTreeNode(progressBar);

  renderer.getNodeMap().put(top, new ProgressTreeCellRenderer2(progressBar));



  createNodes(top, renderer);

  DefaultTreeModel model = new DefaultTreeModel(top);  



  JTree tree = new JTree(model);

  tree.setCellRenderer(renderer);

  JScrollPane pane = new JScrollPane(tree);

  tree.clearSelection();

  frame.getContentPane().add(pane); 

  frame.setSize(250, 250); 

  frame.setVisible(true); 

 }



 private static void createNodes(DefaultMutableTreeNode top, ProgressTreeCellRenderer renderer) {

  JProgressBar progressBar1 = new JProgressBar(0, 100);

  progressBar1.setValue(25);

  progressBar1.setStringPainted(true);

  DefaultMutableTreeNode one =

    new DefaultMutableTreeNode(progressBar1);

  top.add(one);

  renderer.getNodeMap().put(one, new ProgressTreeCellRenderer2(progressBar1));



  JProgressBar progressBar2 = new JProgressBar(0, 100);

  progressBar2.setValue(25);

  progressBar2.setStringPainted(true);

  DefaultMutableTreeNode two =

    new DefaultMutableTreeNode(progressBar2);

  top.add(two);

  renderer.getNodeMap().put(two, new ProgressTreeCellRenderer2(progressBar2));

 }



}



@SuppressWarnings("serial")

class ProgressTreeCellRenderer extends DefaultTreeCellRenderer {



 private HashMap<DefaultMutableTreeNode, ProgressTreeCellRenderer2> nodeMap = new HashMap<DefaultMutableTreeNode, ProgressTreeCellRenderer2>();



 @Override

 public Component getTreeCellRendererComponent(JTree tree, final Object value, boolean selected, boolean expanded, boolean leaf, int row, boolean hasFocus) {

  if(nodeMap.containsKey(value)) {

   //I was expecting this to work, alas it does not?

   setClosedIcon(new IconUIResource(new NodeIcon('+')));

   setOpenIcon(new IconUIResource(new NodeIcon('-')));

   return nodeMap.get(value).getTreeCellRendererComponent(tree, value, selected, expanded, leaf, row, hasFocus);

  }

  return super.getTreeCellRendererComponent(tree, value, selected, expanded, leaf, row, hasFocus);

 }



 public HashMap<DefaultMutableTreeNode, ProgressTreeCellRenderer2> getNodeMap() {

  return nodeMap;

 }

}



class ProgressTreeCellRenderer2 implements TreeCellRenderer {



 private JProgressBar _progressBar;

 private DefaultTreeCellRenderer _defaultRenderer;



 public ProgressTreeCellRenderer2(JProgressBar progressBar) {

  _progressBar = progressBar;

  _defaultRenderer = new DefaultTreeCellRenderer();

 }



 @Override

 public Component getTreeCellRendererComponent(JTree tree, final Object value, boolean selected, boolean expanded, boolean leaf, int row, boolean hasFocus) {

  Component render = _defaultRenderer.getTreeCellRendererComponent(tree, value, selected, expanded, leaf, row, hasFocus);

  final JPanel panel = new JPanel();

  BoxLayout layout = new BoxLayout(panel, BoxLayout.X_AXIS);



  panel.setLayout(layout);

  panel.add(_progressBar);

  render = panel;  

  return render;

 }



}



class NodeIcon implements Icon {



 private static final int SIZE = 9;



 private char type;



 public NodeIcon(char type) {

  this.type = type;

 }



 public void paintIcon(Component c, Graphics g, int x, int y) {

  g.setColor(UIManager.getColor("Tree.background"));

  g.fillRect(x, y, SIZE - 1, SIZE - 1);



  g.setColor(UIManager.getColor("Tree.hash").darker());

  g.drawRect(x, y, SIZE - 1, SIZE - 1);



  g.setColor(UIManager.getColor("Tree.foreground"));

  g.drawLine(x + 2, y + SIZE / 2, x + SIZE - 3, y + SIZE / 2);

  if (type == '+') {

   g.drawLine(x + SIZE / 2, y + 2, x + SIZE / 2, y + SIZE - 3);

  }

 }



 public int getIconWidth() {

  return SIZE;

 }



 public int getIconHeight() {

  return SIZE;

 }

}
panel.add((new JLabel((Icon)UIManager.get("Tree.closedIcon"))));

如果 ProgressTreeCellRenderer 调用 setClosedIcon 或 setOpenIcon 无效，因为您正在返回从 nodeMap 检索的另一个渲染器。您必须在 ProgressTreeCellRenderer2 的实现中添加图标。例如，尝试这样在 ProgressTreeCellRenderer2 的面板中添加一个图标：

package com.testingarea;



import java.awt.Component;

import java.awt.Graphics;

import java.util.HashMap;



import javax.swing.BoxLayout;

import javax.swing.Icon;

import javax.swing.JFrame;

import javax.swing.JPanel;

import javax.swing.JProgressBar;

import javax.swing.JScrollPane;

import javax.swing.JTree;

import javax.swing.UIManager;

import javax.swing.plaf.IconUIResource;

import javax.swing.tree.DefaultMutableTreeNode;

import javax.swing.tree.DefaultTreeCellRenderer;

import javax.swing.tree.DefaultTreeModel;

import javax.swing.tree.TreeCellRenderer;



public class TestTrees { 



 public static void main(String args[]) { 

  JFrame frame = new JFrame("Tree"); 

  frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);



  ProgressTreeCellRenderer renderer = new ProgressTreeCellRenderer();



  JProgressBar progressBar = new JProgressBar(0, 100);

  progressBar.setValue(50);

  progressBar.setStringPainted(true);

  DefaultMutableTreeNode top =

    new DefaultMutableTreeNode(progressBar);

  renderer.getNodeMap().put(top, new ProgressTreeCellRenderer2(progressBar));



  createNodes(top, renderer);

  DefaultTreeModel model = new DefaultTreeModel(top);  



  JTree tree = new JTree(model);

  tree.setCellRenderer(renderer);

  JScrollPane pane = new JScrollPane(tree);

  tree.clearSelection();

  frame.getContentPane().add(pane); 

  frame.setSize(250, 250); 

  frame.setVisible(true); 

 }



 private static void createNodes(DefaultMutableTreeNode top, ProgressTreeCellRenderer renderer) {

  JProgressBar progressBar1 = new JProgressBar(0, 100);

  progressBar1.setValue(25);

  progressBar1.setStringPainted(true);

  DefaultMutableTreeNode one =

    new DefaultMutableTreeNode(progressBar1);

  top.add(one);

  renderer.getNodeMap().put(one, new ProgressTreeCellRenderer2(progressBar1));



  JProgressBar progressBar2 = new JProgressBar(0, 100);

  progressBar2.setValue(25);

  progressBar2.setStringPainted(true);

  DefaultMutableTreeNode two =

    new DefaultMutableTreeNode(progressBar2);

  top.add(two);

  renderer.getNodeMap().put(two, new ProgressTreeCellRenderer2(progressBar2));

 }



}



@SuppressWarnings("serial")

class ProgressTreeCellRenderer extends DefaultTreeCellRenderer {



 private HashMap<DefaultMutableTreeNode, ProgressTreeCellRenderer2> nodeMap = new HashMap<DefaultMutableTreeNode, ProgressTreeCellRenderer2>();



 @Override

 public Component getTreeCellRendererComponent(JTree tree, final Object value, boolean selected, boolean expanded, boolean leaf, int row, boolean hasFocus) {

  if(nodeMap.containsKey(value)) {

   //I was expecting this to work, alas it does not?

   setClosedIcon(new IconUIResource(new NodeIcon('+')));

   setOpenIcon(new IconUIResource(new NodeIcon('-')));

   return nodeMap.get(value).getTreeCellRendererComponent(tree, value, selected, expanded, leaf, row, hasFocus);

  }

  return super.getTreeCellRendererComponent(tree, value, selected, expanded, leaf, row, hasFocus);

 }



 public HashMap<DefaultMutableTreeNode, ProgressTreeCellRenderer2> getNodeMap() {

  return nodeMap;

 }

}



class ProgressTreeCellRenderer2 implements TreeCellRenderer {



 private JProgressBar _progressBar;

 private DefaultTreeCellRenderer _defaultRenderer;



 public ProgressTreeCellRenderer2(JProgressBar progressBar) {

  _progressBar = progressBar;

  _defaultRenderer = new DefaultTreeCellRenderer();

 }



 @Override

 public Component getTreeCellRendererComponent(JTree tree, final Object value, boolean selected, boolean expanded, boolean leaf, int row, boolean hasFocus) {

  Component render = _defaultRenderer.getTreeCellRendererComponent(tree, value, selected, expanded, leaf, row, hasFocus);

  final JPanel panel = new JPanel();

  BoxLayout layout = new BoxLayout(panel, BoxLayout.X_AXIS);



  panel.setLayout(layout);

  panel.add(_progressBar);

  render = panel;  

  return render;

 }



}



class NodeIcon implements Icon {



 private static final int SIZE = 9;



 private char type;



 public NodeIcon(char type) {

  this.type = type;

 }



 public void paintIcon(Component c, Graphics g, int x, int y) {

  g.setColor(UIManager.getColor("Tree.background"));

  g.fillRect(x, y, SIZE - 1, SIZE - 1);



  g.setColor(UIManager.getColor("Tree.hash").darker());

  g.drawRect(x, y, SIZE - 1, SIZE - 1);



  g.setColor(UIManager.getColor("Tree.foreground"));

  g.drawLine(x + 2, y + SIZE / 2, x + SIZE - 3, y + SIZE / 2);

  if (type == '+') {

   g.drawLine(x + SIZE / 2, y + 2, x + SIZE / 2, y + SIZE - 3);

  }

 }



 public int getIconWidth() {

  return SIZE;

 }



 public int getIconHeight() {

  return SIZE;

 }

}
panel.add((new JLabel((Icon)UIManager.get("Tree.closedIcon"))));

但是，请注意，您当前的实现非常昂贵。不仅每个节点都有一个新的渲染器，而且您在 getTreeCellRendererComponent() 内重新分配面板实例。尝试对具有预分配控件的所有节点使用单个渲染器，在这些节点中，您仅根据 getTreeCellRendererComponent 的参数更新属性。有关渲染器详细信息和树显示自定义示例，请参阅如何使用树。

看看这个答案(由@mKorbel 提供)，它说明了表格中的单个进度条渲染器。

Custom JTree cell renderers with custom open/close icons

Custom JTree cell renderers with custom open/close icons

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