swt tree 关联选择监听器

该监听需注册到tree对象上

 

 

/**
	 * @author hKF76182 zero
	 *
	 */
	public static class TreeSelectListener implements SelectionListener{
		@Override
		public void widgetSelected(SelectionEvent e) {
			if(!(e.item instanceof TreeItem)){
				return;
			}
			TreeItem treeItem=(TreeItem) e.item;
			downLookup(treeItem);
			upLookup(treeItem);
		}

		@Override
		public void widgetDefaultSelected(SelectionEvent e) {
			// TODO Auto-generated method stub
			
		}
		
		private void downLookup(TreeItem treeItem){
			boolean checked=treeItem.getChecked();
			TreeItem[] children = treeItem.getItems();
			for (TreeItem item : children) {
				item.setChecked(checked);
				downLookup(item);
			}
		}

		private void upLookup(TreeItem treeItem) {
			boolean checked = treeItem.getChecked();
			TreeItem pitem = treeItem.getParentItem();
			if (checked) {
				if (pitem != null) {
					TreeItem[] childrens = pitem.getItems();
					pitem.setChecked(true);
					for (TreeItem children : childrens) {
						System.out.println(children.getText());
						if(!children.getChecked()){
							pitem.setChecked(false);
							break;
						}
					}
					upLookup(pitem);
				}
			} else {
				if (pitem != null) {
					upLookup(pitem);
					pitem.setChecked(false);
				}
			}
		}
	}

/** 带有半选状态的监听
	 * @author hKF76182 zero
	 *
	 */
	 public static class TreeSelectListener implements SelectionListener{
		@Override
		public void widgetSelected(SelectionEvent e) {
			if(!(e.item instanceof TreeItem)){
				return;
			}
			TreeItem treeItem=(TreeItem) e.item;
			downLookup(treeItem);
			upLookup(treeItem);
		}

		@Override
		public void widgetDefaultSelected(SelectionEvent e) {
			// TODO Auto-generated method stub
			
		}
		
		private void downLookup(TreeItem treeItem){
			boolean checked=treeItem.getChecked();
			TreeItem[] children = treeItem.getItems();
			for (TreeItem item : children) {
				item.setChecked(checked);
				downLookup(item);
			}
			if(checked){
				treeItem.setGrayed(false);
			}
		}

		private void upLookup(TreeItem treeItem) {
			TreeItem pitem = treeItem.getParentItem();
			if (pitem != null) {
				TreeItem[] childrens = pitem.getItems();
				boolean hasChildrenChecked = false;
				boolean hasChildrenNoChecked = false;
				for (TreeItem children : childrens) {
					if (children.getChecked()) {
						hasChildrenChecked = true;
						if (children.getGrayed()) {
							hasChildrenNoChecked = true;
							break;
						}
					} else {
						hasChildrenNoChecked = true;
						if(hasChildrenChecked){
							break;
						}
					}
				}
				pitem.setChecked(hasChildrenChecked);
				pitem.setGrayed(hasChildrenNoChecked);
				upLookup(pitem);
			}
		}
	}