jface的CheckboxTreeViewer实现单选

需求：使用FilteredTree实现一个下面这样的Dialog，要求Check框单选，即只能选择一个：当选择新的时候，旧的不选。说明：FilteredTree自带一个文本输入框。

1、自己的类继承org.eclipse.jface.dialogs.Dialog

2、在createDialogArea方法中实现自己的窗体：

 protected Control createDialogArea(Composite parent) {
         Composite composite = new Composite(parent,SWT.NULL);
         composite.getShell().setText("****选择");

         composite.setLayout(new GridLayout(1,false));
         GridData compositeGridData = new GridData(GridData.FILL_BOTH);
         composite.setLayoutData(compositeGridData);

         Label title = new Label(composite,SWT.NONE);
         title.setAlignment(SWT.LEFT);
         title.setText("可选**信息");
         title.setLayoutData(new GridData(SWT.LEFT,SWT.TOP,false,false,1,1));

         ChooseProjectEntryFilteredTree filteredTree = new ChooseProjectEntryFilteredTree(
                 composite,
                 SWT.BORDER,
                 new ChooseProjectEntryPatternFilter(),
                 true);
         this.treeViewer = filteredTree.getViewer();
         //this.treeViewer.setUseHashlookup(true);

         this.tree = this.treeViewer.getTree();
         this.tree.setToolTipText("请输入***的关键词");

         this.checkboxTreeViewer = new CheckboxTreeViewer(this.tree);

         GridData gd = new GridData(SWT.FILL,SWT.FILL,true,false,1,1);
         gd.heightHint = 250;
         this.tree.setLayoutData(gd);
         this.tree.setLinesVisible(true);
         this.tree.setHeaderVisible(true);

         TreeColumn funcDecl = new TreeColumn(this.tree,SWT.CENTER);
         funcDecl.setText("****");
         funcDecl.setWidth(240);
         funcDecl.addSelectionListener(new SelectionAdapter() {
             boolean sortType = true;

             @Override
             public void widgetSelected(SelectionEvent e) {
                 sortType = !sortType;
                 treeViewer.setSorter(sortType ? ChooseProjectEntrySorter.sorter
                         : ChooseProjectEntrySorter.reverseSorter);
             }

         });

         TreeColumn file = new TreeColumn(this.tree,SWT.CENTER);
         file.setText("****");
         file.setWidth(270);

         TreeColumn line = new TreeColumn(this.tree,SWT.CENTER);
         line.setText("***");
         line.setWidth(100);

         treeViewer.setContentProvider(new ChooseProjectEntryContentProvider());
         treeViewer.setLabelProvider(new ChooseProjectEntryLabelProvider());
         treeViewer.setSorter(ChooseProjectEntrySorter.sorter);
         treeViewer.setInput(manager);

         this.selectedLabel = new Label(composite,SWT.NONE);
         this.selectedLabel.setAlignment(SWT.LEFT);
         GridData labelGd = new GridData(SWT.LEFT,SWT.TOP,true,false,1,1);
         labelGd.widthHint = 380;
         this.selectedLabel.setLayoutData(labelGd);

         this.checkboxTreeViewer.addCheckStateListener(checkStateListener);

         //this.treeViewer.addSelectionChangedListener(listener);
         return null;
     }

代码如下：

说明：

treeViewer.setContentProvider(new ChooseProjectEntryContentProvider());
        treeViewer.setLabelProvider(new ChooseProjectEntryLabelProvider());
        treeViewer.setSorter(ChooseProjectEntrySorter.sorter);
        treeViewer.setInput(manager);

这里设置的是TreeViewer的content provider和label provider、sorter，所以并不能正常使用checkboxTreeViewer.setChecked()和setSubtreeChecked()，并不能像这个链接中那样设置指定行的checked状态为false，所以需要使用下面的方法：

1）、checkboxTreeViewer监听事件：

     /**
      * 单选表格
      */
     private ICheckStateListener checkStateListener = new ICheckStateListener(){
         @Override
         public void checkStateChanged(CheckStateChangedEvent event) {
             if (event.getChecked()) {
                 setAllCheckedFalse();
                 //checkboxTreeViewer.setChecked(getTreeItem(event.getElement()), true);
                 checkFunc = (FuncItem)(event.getElement());
                 TreeItem item = getTreeItem(checkFunc);
                 if(item != null){
                     item.setChecked(true);
                 }
                 selectedLabel.setText("已选**：" + checkFunc.***);
             }else{
                 checkFunc = null;
             }

             treeViewer.refresh();
         }

     };

代码如下：

2）、设置所有checked的行为unchecked状态：

 /**
      * 设置所有被checked的选项unchecked
      */
     private void setAllCheckedFalse(){
         TreeItem[] items = this.tree.getItems();

         if(items.length > 0){
             for(int i = 0; i < items.length; i ++){
                 TreeItem item = items[i];
                 item.setChecked(false);
             }
         }
     }

代码如下：

3）、getTreeItem函数：

 private TreeItem getTreeItem(FuncItem element){
         TreeItem[] items = this.tree.getItems();

         if(items.length > 0){
             for(int i = 0; i < items.length; i ++){
                 TreeItem item = items[i];
                 if(element.equals((FuncItem)item.getData())){
                     return item;
                 }
             }
         }

         return null;
     }

代码如下：

3、贴一下ChooseProjectEntryFilteredTree的代码

 /**
  * 自行导入需要的包
  */
 public class ChooseProjectEntryFilteredTree extends FilteredTree {

     public ChooseProjectEntryFilteredTree(Composite parent, int treeStyle,
             PatternFilter filter, boolean useNewLook) {
         super(parent, treeStyle, filter, useNewLook);
     }

     @Override
     protected TreeViewer doCreateTreeViewer(Composite parent, int style) {
         return super.doCreateTreeViewer(parent, SWT.CHECK | SWT.SINGLE | SWT.BORDER
                 | SWT.V_SCROLL | SWT.H_SCROLL);
     }

 }

代码如下：

4、贴一下ChooseProjectEntryPatternFilter的代码

 public class ChooseProjectEntryPatternFilter extends PatternFilter {

     @Override
     protected boolean isLeafMatch(Viewer viewer, Object element) {
         TreeViewer treeViewer = (TreeViewer) viewer;

         int numberOfColumns = treeViewer.getTree().getColumnCount();

         ITableLabelProvider labelProvider = (ITableLabelProvider) treeViewer
                 .getLabelProvider();

         boolean isMatch = false;

         for (int columnIndex = 0; columnIndex < numberOfColumns; columnIndex++) {
             String labelText = labelProvider
                     .getColumnText(element, columnIndex);
             isMatch |= wordMatches(labelText);
         }

         return isMatch;
     }

 }

代码如下：

ChooseProjectEntryContentProvider、ChooseProjectEntryLabelProvider、ChooseProjectEntrySorter跟一般的TreeViewer差不多，

这里再贴ChooseProjectEntryLabelProvider的部分代码：

 public class ChooseProjectEntryLabelProvider extends LabelProvider implements ITableLabelProvider{

     @Override
     public Image getColumnImage(Object element, int columnIndex) {
         return null;
     }

     @Override
     public String getColumnText(Object element, int columnIndex) {

         if(element instanceof FuncItem){
             FuncItem func = (FuncItem)element;
             switch(columnIndex){
             case 0:
                 return func.***;
             case 1:
                 return func.***;
             case 2:
                 return String.valueOf(func.***);
             default:
                 return "";
             }
         }

         return getText(element);
     }

 }

代码如下

注意这里实现的是ITableLabelProvider接口。

我自己用checkboxTreeViewer.setChecked(element, state)无法设置event.getElement()【checkStateChanged方法中】元素的状态，

但是使用checkboxTreeViewer.setAllChecked(state)可以设置所有元素的状态为checked或者unchecked，

没办法，我又需要使用FilteredTree，又无法使用setChecked办法设置指定元素状态（我单步调试进入setChecked方法里面看了看，应该是event.getElement()元素的问题），只好想出上面的馊办法，希望对读者有用。