Question

在我的项目中，我使用 gwt 2.5.1 和 gxt 3.0.1 。我创造了树。

    protected void createTree(TreeStore<ProjectExtended> treeStore) {

    ValueProvider<ProjectExtended, SafeHtml> provider = new ValueProvider<ProjectExtended, SafeHtml>() {

        @Override
        public void setValue(ProjectExtended object, SafeHtml value) {

        }

        @Override
        public SafeHtml getValue(ProjectExtended object) {

            if(object == null) return SafeHtmlUtils.EMPTY_SAFE_HTML;

            if (!object.getActive()) {
                return SafeHtmlUtils.fromTrustedString(
                        "<span class=\"projectNotActive\">" + object.getName() + 
                        "</span> " + "<span class=\"dictIdText\"> ( " + 
                        object.getId() + " / " + object.getParentId() + " ) </span>");
            } else {
                return SafeHtmlUtils.fromTrustedString(
                        object.getName() + "<span class=\"dictIdText\"> ( " +
                        object.getId() + " / " + object.getParentId() + " ) </span>");
            }
        }

        @Override
        public String getPath() {
            return "name";
        }
    };

    Tree<ProjectExtended, SafeHtml> tree = new Tree<ProjectExtended, SafeHtml>(treeStore, provider);
    tree.getSelectionModel().setSelectionMode(SelectionMode.SINGLE);

    add(tree);
}

我尝试更改非活动节点的样式。但我无法解决这个问题，因为浏览器显示错误！

http://i.stack.imgur.com/0Jmdq.png

有办法解决这个问题吗？

Answer 1

我解决了这个问题。帮助的文章是here。

有一个简单的代码示例。

您应该创建一个继承的类AbstractCell并覆盖render方法：

public class SimpleAbstractCell extends AbstractCell<String> {

    @Override
    public void render(Context context, String value, SafeHtmlBuilder sb) {
        /*
        * Always do a null check on the value. Cell widgets can pass null to
        * cells if the underlying data contains a null, or if the data arrives
        * out of order.
        */
        if (value == null) {
            return;
        }

        SafeHtml safeValue = SafeHtmlUtils.fromTrustedString(value);
        sb.append(safeValue);
    }
}

在创建树时，您应该声明contentCell：

protected void createTree(TreeStore<ProjectExtended> treeStore) {

    ValueProvider<ProjectExtended, String> provider = new ValueProvider<ProjectExtended, String>() {

        @Override
        public void setValue(ProjectExtended object, String value) {

        }

        @Override
        public String getValue(ProjectExtended object) {

            if(object == null) return "";

            if (!object.getActive()) {
                return 
                    "<span class=\"projectNotActive\">" + object.getName() + 
                    "</span> " + "<span class=\"dictIdText\"> ( " + 
                    object.getId() + " / " + object.getParentId() + " ) </span>";
            } else {
                return 
                    object.getName() + "<span class=\"dictIdText\"> ( " +
                    object.getId() + " / " + object.getParentId() + " ) </span>";
            }
        }

        @Override
        public String getPath() {
            return "name";
        }
    };

    Tree<ProjectExtended, String> tree = new Tree<ProjectExtended, String>(treeStore, provider);
    tree.setCell(new SimpleAbstractCell());
    tree.getSelectionModel().setSelectionMode(SelectionMode.SINGLE);

    add(tree);
}

这就是全部。我希望它对smb有用。

更改节点的样式

1 个答案: