| Name | Description | Type | Package | Framework |
| AbortingReason | The aborting reason used to abort the current execution. | Interface | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| Attributes | Attributes or library properties to customize the behaviors of ZK, such as page rending, fileupload and so on. | Class | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| BooleanPropertyAccess | A Boolean property access class. | Class | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| ComponentCtrl | An addition interface to Component that is used for implementation or tools. | Interface | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| ComponentRedraws | Utilities to implement ComponentCtrl. | Class | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| ComponentsCtrl | Utilities for implementing components. | Class | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| ConfigParser | Used to parse WEB-INF/zk. | Class | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| ContentRenderer | Used with AbstractComponent. | Interface | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| DesktopCache | The cache used to store desktops. | Interface | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| DesktopCacheProvider | Used to retrieve a desktop cache (DesktopCache). | Interface | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| DesktopCtrl | An addition interface to Desktop for implementation. | Interface | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| EventListenerMap | Represents a map of event handlers and listeners. | Interface | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| EventProcessingThread | Represents an event processing thread. | Interface | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| ExecutionCtrl | Additional interface to Execution for implementation. | Interface | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| ExecutionInfo | The information about the event being served by the current execution. | Interface | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| ExecutionsCtrl | Additional utilities for Execution. | Class | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| FailoverManager | Represents a class that is able to handle fail-over in the application specific way. | Interface | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| HtmlPageRenders | Utilities for implementing HTML-based PageRenderer. | Class | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| HtmlPageRenders .RenderContext | The render context which consists of two writers (temp andSee Also:HtmlPageRenders. | Class | org.zkoss.zk.ui.sys.HtmlPageRenders | ZKoss (ZK) |
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| IdGenerator | Used to generate UUID of components and pages and ID of desktops. | Interface | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| IntegerPropertyAccess | An Integer property class. | Class | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| IntPropertyAccess | An int property class. | Class | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| JsContentRenderer | An implementation of ContentRenderer that renders the content as a JavaScript property (i. | Class | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| JSCumulativeContentRenderer | An implementation of ContentRenderer that renders the content as a JavaScript property (i. | Class | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| Names | Utilities about variable's names. | Class | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| ObjectPropertyAccess | An Object proeprty typeSince:8. | Class | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| PageConfig | Represents the info used to initialize a page. | Interface | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| PageCtrl | Addition interface to Page for implementation purpose. | Interface | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| PageRenderer | The page render used to render a page. | Interface | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| PageRenderPatch | A patch that is used to process the rendering result of a page. | Interface | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| PropertiesRenderer | A renderer used to render custom properties for particular components. | Interface | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| PropertyAccess | A property access interface to speed up Java reflection performance. | Interface | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| RequestInfo | The request information used with UiFactory. | Interface | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| RequestQueue | A queue of AuRequest. | Interface | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| Scheduler | A scheduler that is able to schedule a task to execute asynchronously. | Interface | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| SEORenderer | A plugin that an application could add to generate application-specific SEO content. | Interface | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| ServerPush | Represents a server-push controller. | Interface | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| SessionCache | The cache for storing ZK sessions. | Interface | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| SessionCtrl | Additional interface of Session for implementation. | Interface | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| SessionResolver | Used with SessionsCtrl. | Interface | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| SessionsCtrl | An additional utilities for implementation related to Session. | Class | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| ShadowElementsCtrl | Utilities for implementing components. | Class | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| Storage | A storage interface is used for ZK web application to store application data with a string key and a data type value. | Interface | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| StringPropertyAccess | A String property class. | Class | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| StubComponent | A stub component is a 'degenerated' component that does not maintain the states at the server. | Class | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| StubsComponent | Represents a tree of StubComponent that are merged into a single component. | Class | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| UiEngine | UI engine is responsible to process requests from the client, sends the response back to the client with the assistance of | Interface | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| UiFactory | Used to create Session, Desktop, Page, Component, Composer, and ServerPush. | Interface | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| Visualizer | A part of Execution for visualizing the components whose visual parts are modified. | Interface | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| WebAppCtrl | Additional interface of WebApp for implementation. | Interface | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| WebAppFactory | The factory used to instantiate the instance of WebApp. | Interface | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| WebAppFactoryImpl | A web app factory implementation. | Class | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| WebAppsCtrl | An additional utilities for implementation related to WebApp. | Class | org.zkoss.zk.ui.sys | ZKoss (ZK) |
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| XmlContentRenderer | An implementation of ContentRenderer that renders the content as a Xml attribute (i. | Class | org.zkoss.zk.ui.sys | ZKoss (ZK) |