[英]JTree & JButtons - Wrong Rendering when mouse hovers over Button
我有一個關於JTree和JButton的問題似乎當進入“編輯”方式並將鼠標懸停在TreeCells上的按鈕上時,它會渲染按鈕內樹的某些部分。 即使在同一行中從一個按鈕拖動到另一個按鈕,它也會在另一個按鈕上渲染一個按鈕。
這里有一個簡短的自我解釋樣本,您可以復制粘貼以了解我的意思。
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);
}
}
即使當我刪除此部分。 而且我必須單擊一個單元格以進入“編輯模式”,我仍然可以通過將單元格留在鼠標上並返回來獲得效果。
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()));
}
}
我已經花了4天的時間來進行JTree定制。 但這確實使我感到困惑,如何通過輸入Button停止渲染。
我不知道如何解決此問題,但使用invokeLater
和setRowHeight()
有所幫助。
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);
}
});
}
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