我遇到了JTree和JButton的问题 看起来当进入编辑模式并将鼠标悬停在TreeCells上的按钮上时，它会在Button内部呈现树的某些部分。 即使在同一行中从一个按钮拖动到另一个按钮，它也会将一个按钮渲染到另一个按钮上。
这是一个简短的Selfexplaining Sample，你可以复制粘贴到看我的意思。
import java.awt.Color;
import java.awt.Component;
import java.awt.Dimension;
import java.awt.FlowLayout;
import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.awt.event.MouseEvent;
import java.awt.event.MouseMotionListener;
import java.util.EventObject;
import javax.swing.JButton;
import javax.swing.JFrame;
import javax.swing.JLabel;
import javax.swing.JPanel;
import javax.swing.JScrollPane;
import javax.swing.JTree;
import javax.swing.UIManager;
import javax.swing.tree.DefaultMutableTreeNode;
import javax.swing.tree.DefaultTreeCellEditor;
import javax.swing.tree.DefaultTreeCellRenderer;
public class MyProblemWithTree {
public static void main(String...args) {
JFrame frame = new JFrame("Panel");
JScrollPane scroll = new JScrollPane();
DefaultMutableTreeNode node = new DefaultMutableTreeNode("Root");
DefaultMutableTreeNode nodeChild = new DefaultMutableTreeNode("childcaretaker1");
nodeChild.add(new DefaultMutableTreeNode("child1"));
nodeChild.add(new DefaultMutableTreeNode("child2"));
node.add(nodeChild);
final JTree tree = new JTree(node);
tree.setCellRenderer(new MyTreeCellRenderer());
tree.setEditable(true);
tree.setCellEditor(new MyTreeCellEditor(tree));
tree.addMouseMotionListener(new MouseMotionListener() {
@Override
public void mouseMoved(MouseEvent e) {
// TODO Auto-generated method stub
if (tree.getRowForLocation(e.getX(), e.getY()) != -1)
{
tree.startEditingAtPath(tree.getPathForLocation(e.getX(), e.getY()));
}
}
@Override
public void mouseDragged(MouseEvent arg0) {
// TODO Auto-generated method stub
}
});
scroll.setViewportView(tree);
frame.add(scroll);
frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
frame.pack();
frame.setVisible(true);
}
}
class MyTreeCellEditor extends DefaultTreeCellEditor {
JPanel leafPanel;
JLabel colorIcon;
PlayButton play;
PauseButton pause;
JLabel name;
public MyTreeCellEditor(JTree tree) {
super(tree, (MyTreeCellRenderer)tree.getCellRenderer());
leafPanel = new JPanel(new FlowLayout());
colorIcon = new JLabel(UIManager.getIcon("OptionPane.informationIcon"));
play = new PlayButton();
pause = new PauseButton();
name = new JLabel();
play.addActionListener(new ActionListener() {
@Override
public void actionPerformed(ActionEvent arg0) {
// TODO Auto-generated method stub
System.out.println("Playbutton klickt");
}
});
leafPanel.add(colorIcon);
leafPanel.add(name);
leafPanel.add(pause);
leafPanel.add(play);
}
@Override
public Component getTreeCellEditorComponent(JTree tree, Object value,
boolean selected, boolean expanded, boolean leaf, int row) {
name.setText((String)((DefaultMutableTreeNode)value).getUserObject());
pause.setVisible(!leaf);
return leafPanel;
}
@Override
public boolean isCellEditable(EventObject arg0) {
return true;
}
}
class MyTreeCellRenderer extends DefaultTreeCellRenderer {
private static final long serialVersionUID = 3691823996133806942L;
JPanel leafPanel;
JLabel colorIcon;
PlayButton play;
PauseButton pause;
JLabel name;
DefaultTreeCellRenderer defaultRenderer = new DefaultTreeCellRenderer();
Color backgroundSelectionColor;
Color backgroundNonSelectionColor;
public MyTreeCellRenderer() {
leafPanel = new JPanel(new FlowLayout());
colorIcon = new JLabel(UIManager.getIcon("OptionPane.informationIcon"));
play = new PlayButton();
pause = new PauseButton();
name = new JLabel();
leafPanel.add(colorIcon);
leafPanel.add(name);
leafPanel.add(pause);
leafPanel.add(play);
backgroundSelectionColor = new Color(200,200,255,50);
backgroundNonSelectionColor = new Color(0,0,0,0);
}
@Override
public Component getTreeCellRendererComponent(JTree tree, Object value, boolean selected, boolean expanded, boolean leaf, int row, boolean hasFocus) {
name.setText((String)((DefaultMutableTreeNode) value).getUserObject());
if (selected) {
leafPanel.setBackground(backgroundSelectionColor);
} else {
leafPanel.setBackground(backgroundNonSelectionColor);
}
leafPanel.setEnabled(tree.isEnabled());
pause.setVisible(!leaf);
return leafPanel;
}
}
class PlayButton extends JButton{
private static final long serialVersionUID = 550654173835539853L;
Dimension size = new Dimension(140,28);
public PlayButton() {
setIcon(UIManager.getIcon("OptionPane.informationIcon"));
setPressedIcon(UIManager.getIcon("OptionPane.errorIcon"));
setBackground(new Color(0,0,0,0));
setBorderPainted(false);
setPreferredSize(size);
setMaximumSize(size);
setMinimumSize(size);
}
}
class PauseButton extends JButton{
private static final long serialVersionUID = -5877843953696256070L;
Dimension size = new Dimension(140,28);
public PauseButton() {
setIcon(UIManager.getIcon("OptionPane.warningIcon"));
setPressedIcon(UIManager.getIcon("OptionPane.questionIcon"));
setBackground(new Color(0,0,0,0));
setBorderPainted(false);
setPreferredSize(size);
setMaximumSize(size);
setMinimumSize(size);
}
}
即使我删除了这部分。我必须单击一个单元格才能进入编辑模式，我仍然可以通过鼠标离开单元格并返回来获得效果。
public void mouseMoved(MouseEvent e) {
// TODO Auto-generated method stub
if (tree.getRowForLocation(e.getX(), e.getY()) != -1)
{
tree.startEditingAtPath(tree.getPathForLocation(e.getX(), e.getY()));
}
}
我已经花了4天时间进行这个JTree Customizing。但它真的让我困惑，我怎么能通过输入Button来停止渲染。
答案 0 :(得分：1)
我不知道如何解决此问题，但使用invokeLater和setRowHeight()会有所帮助。
public static void main(String... args) {
EventQueue.invokeLater(new Runnable() {
@Override
public void run() {
JFrame frame = new JFrame("Panel");
...
tree.setRowHeight(icon.getIconHeight());
...
frame.setVisible(true);
}
});
}