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java JTree JCheckBox树复选框详解

2019年07月19日  | 移动技术网IT编程  | 我要评论

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本文实例为大家分享了java jtree jcheckbox树复选框展示的具体代码，供大家参考，具体内容如下

1.checktreemanager.java

public class checktreemanager extends mouseadapter implements treeselectionlistener 
{ 
 
  private checktreeselectionmodel selectionmodel = null; 
  
// private jtree tree = new jtree(); 
  private jtree tree = null; 
  
  int hotspot = new jcheckbox().getpreferredsize().width; 
  
  public checktreemanager(jtree tree) 
  { 
   this.tree = tree; 
   selectionmodel = new checktreeselectionmodel(tree.getmodel()); 
   tree.setcellrenderer(new checktreecellrenderer(tree.getcellrenderer(), selectionmodel)); 
   tree.addmouselistener(this); //鼠标监听 
   selectionmodel.addtreeselectionlistener(this); //树选择监听 
  } 
  
  public void mouseclicked(mouseevent me) 
  { 
   treepath path = tree.getpathforlocation(me.getx(), me.gety()); 
   if(path==null) 
    return; 
   if(me.getx()>tree.getpathbounds(path).x+hotspot) 
    return; 
   
   boolean selected = selectionmodel.ispathselected(path, true); 
   selectionmodel.removetreeselectionlistener(this); 
   
   try 
   { 
    if(selected) 
     selectionmodel.removeselectionpath(path); 
    else 
     selectionmodel.addselectionpath(path); 
   } 
   finally 
   { 
    selectionmodel.addtreeselectionlistener(this); 
    tree.treedidchange(); 
   } 
  } 
  
  public checktreeselectionmodel getselectionmodel() 
  { 
   return selectionmodel; 
  } 
  
  public void valuechanged(treeselectionevent e) 
  { 
   tree.treedidchange(); 
  } 
  
}

2.checktreeselectionmodel.java

public class checktreeselectionmodel extends defaulttreeselectionmodel 
{ 
  private treemodel model; 
  
  public checktreeselectionmodel(treemodel model) 
  { 
   this.model = model; 
   setselectionmode(treeselectionmodel.discontiguous_tree_selection); 
  } 
  
  // tests whether there is any unselected node in the subtree of given path 
  public boolean ispartiallyselected(treepath path){ 
   if(ispathselected(path, true)) 
    return false; 
   treepath[] selectionpaths = getselectionpaths(); 
   if(selectionpaths==null) 
    return false; 
   for(int j = 0; j<selectionpaths.length; j++) 
   { 
    if(isdescendant(selectionpaths[j], path)) 
     return true; 
   } 
   return false; 
  } 
  
  // tells whether given path is selected. 
  // if dig is true, then a path is assumed to be selected, if 
  // one of its ancestor is selected. 
  public boolean ispathselected(treepath path, boolean dig) 
  { 
   if(!dig) 
    return super.ispathselected(path); 
   while(path!=null && !super.ispathselected(path)) 
    path = path.getparentpath(); 
   return path!=null; 
  } 
  
  // is path1 descendant of path2 
  private boolean isdescendant(treepath path1, treepath path2) 
  { 
   object obj1[] = path1.getpath(); 
   object obj2[] = path2.getpath(); 
   for(int i = 0; i<obj2.length; i++) 
   { 
    if(obj1[i]!=obj2[i]) 
     return false; 
   } 
   return true; 
  } 
  
  public void setselectionpaths(treepath[] ppaths) 
  { 
   throw new unsupportedoperationexception("not implemented yet!!!"); 
  } 
  
  public void addselectionpaths(treepath[] paths) 
  { 
   // unselect all descendants of paths[] 
   for(int i = 0; i<paths.length; i++){ 
    treepath path = paths[i]; 
    treepath[] selectionpaths = getselectionpaths(); 
    if(selectionpaths==null) 
     break; 
    arraylist toberemoved = new arraylist(); 
    for(int j = 0; j<selectionpaths.length; j++) 
    { 
     if(isdescendant(selectionpaths[j], path)) 
      toberemoved.add(selectionpaths[j]); 
    } 
    super.removeselectionpaths((treepath[])toberemoved.toarray(new treepath[0])); 
   } 
   
   // if all siblings are selected then unselect them and select parent recursively 
   // otherwize just select that path. 
   for(int i = 0; i<paths.length; i++) 
   { 
    treepath path = paths[i]; 
    treepath temp = null; 
    while(aresiblingsselected(path)) 
    { 
     temp = path; 
     if(path.getparentpath()==null) 
      break; 
     path = path.getparentpath(); 
    } 
    if(temp!=null) 
    { 
     if(temp.getparentpath()!=null) 
      addselectionpath(temp.getparentpath()); 
     else 
     { 
      if(!isselectionempty()) 
       removeselectionpaths(getselectionpaths()); 
      super.addselectionpaths(new treepath[]{temp}); 
     } 
    } 
    else 
     super.addselectionpaths(new treepath[]{ path}); 
   } 
  } 
  
  // tells whether all siblings of given path are selected. 
  private boolean aresiblingsselected(treepath path) 
  { 
   treepath parent = path.getparentpath(); 
   if(parent==null) 
    return true; 
   object node = path.getlastpathcomponent(); 
   object parentnode = parent.getlastpathcomponent(); 
   
   int childcount = model.getchildcount(parentnode); 
   for(int i = 0; i<childcount; i++) 
   { 
    object childnode = model.getchild(parentnode, i); 
    if(childnode==node) 
     continue; 
    if(!ispathselected(parent.pathbyaddingchild(childnode))) 
     return false; 
   } 
   return true; 
  } 
  
  public void removeselectionpaths(treepath[] paths) 
  { 
   for(int i = 0; i<paths.length; i++){ 
    treepath path = paths[i]; 
    if(path.getpathcount()==1) 
     super.removeselectionpaths(new treepath[]{ path}); 
    else 
     toggleremoveselection(path); 
   } 
  } 
  
  // if any ancestor node of given path is selected then unselect it 
  // and selection all its descendants except given path and descendants. 
  // otherwise just unselect the given path 
  private void toggleremoveselection(treepath path) 
  { 
   stack stack = new stack(); 
   treepath parent = path.getparentpath(); 
   while(parent!=null && !ispathselected(parent)) 
   { 
    stack.push(parent); 
    parent = parent.getparentpath(); 
   } 
   if(parent!=null) 
    stack.push(parent); 
   else{ 
    super.removeselectionpaths(new treepath[]{path}); 
    return; 
   } 
   
   while(!stack.isempty()) 
   { 
    treepath temp = (treepath)stack.pop(); 
    treepath peekpath = stack.isempty() ? path : (treepath)stack.peek(); 
    object node = temp.getlastpathcomponent(); 
    object peeknode = peekpath.getlastpathcomponent(); 
    int childcount = model.getchildcount(node); 
    for(int i = 0; i<childcount; i++){ 
     object childnode = model.getchild(node, i); 
     if(childnode!=peeknode) 
      super.addselectionpaths(new treepath[]{temp.pathbyaddingchild(childnode)}); 
    } 
   } 
   super.removeselectionpaths(new treepath[]{parent}); 
  } 
  
  
}

3.checktreecellrenderer .java

public class checktreecellrenderer extends jpanel implements treecellrenderer 
{ 
 private checktreeselectionmodel selectionmodel; 
 private treecellrenderer delegate; 
// private tristatecheckbox checkbox = new tristatecheckbox(); 
 private jcheckbox checkbox = new jcheckbox(); 
 
 public checktreecellrenderer(treecellrenderer delegate, checktreeselectionmodel selectionmodel){ 
  this.delegate = delegate; 
  this.selectionmodel = selectionmodel; 
  setlayout(new borderlayout()); 
  setopaque(false); 
  checkbox.setopaque(false); 
 } 
 
 
 public component gettreecellrenderercomponent(jtree tree, object value, boolean selected, boolean expanded, boolean leaf, int row, boolean hasfocus){ 
  component renderer = delegate.gettreecellrenderercomponent(tree, value, selected, expanded, leaf, row, hasfocus); 
 
  treepath path = tree.getpathforrow(row); 
  if(path!=null) 
  { 
   system.out.println(path); 
   if(selectionmodel.ispathselected(path, true)) 
    checkbox.setselected(true); 
   else 
   { 
    system.out.println(selectionmodel.ispartiallyselected(path)); 
    checkbox.setselected(selectionmodel.ispartiallyselected(path) ? true : false); 
   } 
  } 
  removeall(); 
  add(checkbox, borderlayout.west); 
  add(renderer, borderlayout.center); 
  return this; 
 } 
}

4.用法

checktreemanager checktreemanager = new checktreemanager(jtree);

以上就是本文的全部内容，希望对大家的学习有所帮助，也希望大家多多支持移动技术网。

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