JTree - 向右移动节点
JTree - Move nodes to the right
我有一个具有多个节点级别的 JTree
。我将根节点的图标更改为更大的图标。问题是,现在图标比默认图标大,垂直虚线和相应的子节点没有在根节点图标下方居中。
见下图:
我的问题是:是否可以将除根节点之外的所有内容都向右移动一点?
在JTree
中设置左边距,在JLayer
中单独绘制真正的根节点图标。
import java.awt.*;
import javax.swing.*;
import javax.swing.plaf.*;
import javax.swing.tree.*;
public class MiddleXOfRootNodeIconTest {
public JComponent makeUI() {
int ow = UIManager.getIcon("Tree.openIcon").getIconWidth();
int iw = 32;
Icon icon1 = new ColorIcon(Color.GREEN, new Dimension(ow, iw));
Icon icon2 = new ColorIcon(new Color(0x550000AA, true), new Dimension(iw, iw));
JTree tree = new JTree();
tree.setBorder(BorderFactory.createEmptyBorder(1, 1 + iw / 2, 1, 1));
//TEST:
//tree.setBorder(BorderFactory.createMatteBorder(1, 1 + iw / 2, 1, 1, Color.RED));
tree.setCellRenderer(new CompoundTreeCellRenderer(icon1, iw));
LayerUI<JTree> layerUI = new LayerUI<JTree>() {
@Override public void paint(Graphics g, JComponent c) {
super.paint(g, c);
Graphics2D g2 = (Graphics2D) g.create();
icon2.paintIcon(c, g2, 1 + ow / 2, 1);
g2.dispose();
}
};
JPanel p = new JPanel(new GridLayout(1, 3));
p.add(new JScrollPane(new JTree()));
p.add(new JScrollPane(new JLayer<JTree>(tree, layerUI)));
return p;
}
public static void main(String... args) {
EventQueue.invokeLater(() -> {
JFrame f = new JFrame();
f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
f.getContentPane().add(new MiddleXOfRootNodeIconTest().makeUI());
f.setSize(320, 240);
f.setLocationRelativeTo(null);
f.setVisible(true);
});
}
}
class CompoundTreeCellRenderer extends DefaultTreeCellRenderer {
private static final Color ALPHA_ZERO = new Color(0x0, true);
private final JPanel p = new JPanel(new GridBagLayout());
private final GridBagConstraints ci = new GridBagConstraints();
private final GridBagConstraints cl = new GridBagConstraints();
private final JLabel icon = new JLabel();
private final Icon gap1 = new ColorIcon(ALPHA_ZERO, new Dimension(2, 10));
private final Icon gap2;
private final Icon rootIcon;
public CompoundTreeCellRenderer(Icon rootIcon, int iw) {
super();
Dimension d = new Dimension(2 + (iw - rootIcon.getIconWidth()) / 2, 10);
this.rootIcon = rootIcon;
//TEST: this.gap2 = new ColorIcon(Color.BLUE, d);
this.gap2 = new ColorIcon(ALPHA_ZERO, d);
this.setOpaque(false);
p.setOpaque(false);
ci.gridx = 0;
ci.weightx = 1.0;
cl.gridx = 1;
cl.anchor = GridBagConstraints.WEST;
}
@Override public Component getTreeCellRendererComponent(
JTree tree, Object value, boolean selected, boolean expanded,
boolean leaf, int row, boolean hasFocus) {
JLabel l = (JLabel) super.getTreeCellRendererComponent(
tree, value, selected, expanded, leaf, row, hasFocus);
l.setOpaque(false);
p.removeAll();
if (value.equals(tree.getModel().getRoot())) {
icon.setIcon(rootIcon);
l.setIcon(gap2);
} else {
icon.setIcon(l.getIcon());
l.setIcon(gap1);
}
p.add(icon, ci);
p.add(l, cl);
return p;
}
}
class ColorIcon implements Icon {
private final Color color;
private final Dimension dim;
public ColorIcon(Color color, Dimension dim) {
this.color = color;
this.dim = dim;
}
@Override public void paintIcon(Component c, Graphics g, int x, int y) {
Graphics2D g2 = (Graphics2D) g.create();
g2.translate(x, y);
g2.setColor(color);
g2.fillRect(1, 1, dim.width - 2, dim.height - 2);
g2.dispose();
}
@Override public int getIconWidth() {
return dim.width;
}
@Override public int getIconHeight() {
return dim.height;
}
}
我有一个具有多个节点级别的 JTree
。我将根节点的图标更改为更大的图标。问题是,现在图标比默认图标大,垂直虚线和相应的子节点没有在根节点图标下方居中。
见下图:
我的问题是:是否可以将除根节点之外的所有内容都向右移动一点?
在JTree
中设置左边距,在JLayer
中单独绘制真正的根节点图标。
import java.awt.*;
import javax.swing.*;
import javax.swing.plaf.*;
import javax.swing.tree.*;
public class MiddleXOfRootNodeIconTest {
public JComponent makeUI() {
int ow = UIManager.getIcon("Tree.openIcon").getIconWidth();
int iw = 32;
Icon icon1 = new ColorIcon(Color.GREEN, new Dimension(ow, iw));
Icon icon2 = new ColorIcon(new Color(0x550000AA, true), new Dimension(iw, iw));
JTree tree = new JTree();
tree.setBorder(BorderFactory.createEmptyBorder(1, 1 + iw / 2, 1, 1));
//TEST:
//tree.setBorder(BorderFactory.createMatteBorder(1, 1 + iw / 2, 1, 1, Color.RED));
tree.setCellRenderer(new CompoundTreeCellRenderer(icon1, iw));
LayerUI<JTree> layerUI = new LayerUI<JTree>() {
@Override public void paint(Graphics g, JComponent c) {
super.paint(g, c);
Graphics2D g2 = (Graphics2D) g.create();
icon2.paintIcon(c, g2, 1 + ow / 2, 1);
g2.dispose();
}
};
JPanel p = new JPanel(new GridLayout(1, 3));
p.add(new JScrollPane(new JTree()));
p.add(new JScrollPane(new JLayer<JTree>(tree, layerUI)));
return p;
}
public static void main(String... args) {
EventQueue.invokeLater(() -> {
JFrame f = new JFrame();
f.setDefaultCloseOperation(WindowConstants.EXIT_ON_CLOSE);
f.getContentPane().add(new MiddleXOfRootNodeIconTest().makeUI());
f.setSize(320, 240);
f.setLocationRelativeTo(null);
f.setVisible(true);
});
}
}
class CompoundTreeCellRenderer extends DefaultTreeCellRenderer {
private static final Color ALPHA_ZERO = new Color(0x0, true);
private final JPanel p = new JPanel(new GridBagLayout());
private final GridBagConstraints ci = new GridBagConstraints();
private final GridBagConstraints cl = new GridBagConstraints();
private final JLabel icon = new JLabel();
private final Icon gap1 = new ColorIcon(ALPHA_ZERO, new Dimension(2, 10));
private final Icon gap2;
private final Icon rootIcon;
public CompoundTreeCellRenderer(Icon rootIcon, int iw) {
super();
Dimension d = new Dimension(2 + (iw - rootIcon.getIconWidth()) / 2, 10);
this.rootIcon = rootIcon;
//TEST: this.gap2 = new ColorIcon(Color.BLUE, d);
this.gap2 = new ColorIcon(ALPHA_ZERO, d);
this.setOpaque(false);
p.setOpaque(false);
ci.gridx = 0;
ci.weightx = 1.0;
cl.gridx = 1;
cl.anchor = GridBagConstraints.WEST;
}
@Override public Component getTreeCellRendererComponent(
JTree tree, Object value, boolean selected, boolean expanded,
boolean leaf, int row, boolean hasFocus) {
JLabel l = (JLabel) super.getTreeCellRendererComponent(
tree, value, selected, expanded, leaf, row, hasFocus);
l.setOpaque(false);
p.removeAll();
if (value.equals(tree.getModel().getRoot())) {
icon.setIcon(rootIcon);
l.setIcon(gap2);
} else {
icon.setIcon(l.getIcon());
l.setIcon(gap1);
}
p.add(icon, ci);
p.add(l, cl);
return p;
}
}
class ColorIcon implements Icon {
private final Color color;
private final Dimension dim;
public ColorIcon(Color color, Dimension dim) {
this.color = color;
this.dim = dim;
}
@Override public void paintIcon(Component c, Graphics g, int x, int y) {
Graphics2D g2 = (Graphics2D) g.create();
g2.translate(x, y);
g2.setColor(color);
g2.fillRect(1, 1, dim.width - 2, dim.height - 2);
g2.dispose();
}
@Override public int getIconWidth() {
return dim.width;
}
@Override public int getIconHeight() {
return dim.height;
}
}