通过以下步骤，您可以在自定义组件上验证 PDF 注释权限和视图注释权限。这样更方便地管理和控制不同注释的权限设置。

如下代码演示了如何在新添加的自定义组件上验证注释权限。

var pdfui = new PDFUI({
    // 自定义新增一个删除 annotation 的组件
    fragments: [{
        target: 'hand-tool',
        template: '<xbutton class="fv__ui-toolbar-show-text-button" name="cus-delete-button">button behind of hand-tool</xbutton>',
        action: UIExtension.UIConsts.FRAGMENT_ACTION.AFTER,
        config: [{
            target: 'cus-delete-button',
            callback: PDFViewCtrl.shared.createClass({
                mounted: function () {
                    this.permissionHandler();
                },
                permissionHandler() {
                    const Events = UIExtension.UIEvents;
                    let permissionHandler = async () => {
                        const docRender = await pdfui.getPDFDocRender();
                        // 获取 PDF 注释权限
                        const userPermission = docRender.getUserPermission().getValue();
                        const {AnnotForm} = UIExtension.PDFViewCtrl.Consts.PDFDocPermission;
                        this.hasAnnotForm = (userPermission & AnnotForm) === AnnotForm;
                        // 是否禁用此组件
                        this.component[this.hasAnnotForm ? 'enable' : 'disable']();
                    }
                    this.addDestroyHook(
                        pdfui.addViewerEventListener(Events.openFileSuccess, permissionHandler),
                        pdfui.addViewerEventListener(Events.permissionChanged, permissionHandler),
                        pdfui.addViewerEventListener(Events.activeAnnotation, async annotRender => {
                            // 获取激活的 annotation
                            const annot = annotRender.getAnnot();
                            const pdfViewer = await pdfui.getPDFViewer();
                            // 获取 AnnotationAuthorityManager 管理器
                            const annotAuthMgr = pdfViewer.getAnnotAuthorityManager();
                            // 获取指定 annotation 的视图注释权限
                            const annotPermission = await annotAuthMgr.getPermission(annot);
                            // 是否可以删除 annot
                            const isDeleteAble = annotPermission.isDeletable();
                            // 是否禁用此组件
                            this.component[isDeleteAble && this.hasAnnotForm ? 'enable' : 'disable']();
                        })
                    )
                }
            }, UIExtension.Controller)
        }]
    }]
});