java - JTree - Move nodes to the right -


i have jtree several node levels. changed icons root nodes bigger ones. problem is, icons bigger default ones, vertical dashed lines , corresponding child nodes not centered below root node icon.

see following picture:

jtree

my question is: possible move except root nodes little bit right side?

set left margin in jtree , draw real root node icon separately in jlayer.

enter image description here

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;   } }

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