Class ContentHandler

Hierarchy (view full)

Constructors

constructor

Properties

$oid $oid

Accessors

$class

Methods

$init $instanceof $super $supers afterInit bind destroy get$Class getPosition hideShadow isOpen onFloatUp onHide onShow proxy redraw setContent syncShadow unbind isAssignableFrom isInstance

Constructors

constructor

Properties

$oid

$oid: number = 0

The object ID. Each object has its own unique $oid. It is mainly used for debugging purpose.

Trick: you can test if a JavaScript object is a ZK object by examining this property, such as `if (o.$oid) alert('o is a ZK object');`

Notice: zk.Class extends from zk.Object (so a class also has $oid)

Static $oid

$oid: any

Accessors

$class

  • get $class(): typeof ZKObject

  • The class that this object belongs to.

    Returns typeof ZKObject

Methods

$init

  • $init(props?): void

  • The constructor.

    Parameters

    • Optional props: Record<string, unknown> | (() => void)

    Returns void

    Default Value

    it does nothing so the subclass needs not to copy back
    (also harmless to call back).

    See

    afterInit

    Deprecated

    as of 10.0 released. Using ES6 constructor instead.

$instanceof

  • $instanceof(...klass): boolean

  • Determines if this object is an instance of the class represented by the specified Class parameter. Example:

    if (obj.$instanceof(zul.wgt.Label, zul.wgt.Image)) {
    }

    Parameters

    • Rest ...klass: any[]

      the Class object to be checked. Any number of arguments can be specified.

    Returns boolean

    true if this object is an instance of the class

$super

  • $super<M, F>(mtd, ...args): ReturnType<F>

  • Invokes a method defined in the superclass with any number of arguments. It is like Function's call() that takes any number of arguments.

    Example: ```ts multiply: function (n) { return this.$super('multiply', n + 2); } ```

    Type Parameters

    • M extends "$init" | "$supers" | "_$ais" | "_$supers" | "_$proxies" | "_$super" | "_importantEvts" | "afterCreated_" | "afterInit" | "$class" | "get$Class" | "$oid" | "$instanceof" | "$super" | "proxy" | "onHide" | "onFloatUp" | "onShow" | "destroy" | "redraw" | "bind" | "unbind" | "isOpen" | "getPosition" | "_shadow" | "syncShadow" | "_wgt" | "_content" | "setContent" | "_doMouseEnter" | "_doMouseLeave" | "_pp" | "hideShadow"

    • F extends any

    Parameters

    • mtd: M

      the method name to invoke

    • Rest ...args: Parameters<F>

      any number of arguments

    Returns ReturnType<F>

    the object being returned by the method of the superclass.

    See

    zk.Object.$supers

  • $super<M, F>(klass, mtd, ...args): ReturnType<F>

  • Invokes a method defined in the superclass with any number of arguments. It is like Function's call() that takes any number of arguments.

    It is similar to ZKObject.$super, but this method works even if the superclass calls back the same member method. In short, it is tedious but safer.

    Example: ```ts foo.MyClass = zk.$extends(foo.MySuper, { multiply: function (n) { return this.$super(foo.MyClass, 'multiply', n + 2); } ```

    Notice that the class specified in the first argument is not the super class having the method. Rather, it is the class that invokes this method.

    Type Parameters

    • M extends "$init" | "$supers" | "_$ais" | "_$supers" | "_$proxies" | "_$super" | "_importantEvts" | "afterCreated_" | "afterInit" | "$class" | "get$Class" | "$oid" | "$instanceof" | "$super" | "proxy" | "onHide" | "onFloatUp" | "onShow" | "destroy" | "redraw" | "bind" | "unbind" | "isOpen" | "getPosition" | "_shadow" | "syncShadow" | "_wgt" | "_content" | "setContent" | "_doMouseEnter" | "_doMouseLeave" | "_pp" | "hideShadow"

    • F extends any

    Parameters

    • klass: typeof ZKObject

      the class that invokes this method.

    • mtd: M

      the method name to invoke

    • Rest ...args: Parameters<F>

      any number of arguments

    Returns ReturnType<F>

    the object being returned by the method of the superclass.

    See

    zk.Object.$supers

    Since

    5.0.2

$supers

  • $supers<M, F>(name, args): ReturnType<F>

  • Invokes a method defined in the superclass with an array of arguments. It is like Function's apply() that takes an array of arguments.

    Example: ```ts multiply: function () { return this.$supers('multiply', arguments); } ```

    Type Parameters

    • M extends "$init" | "$supers" | "_$ais" | "_$supers" | "_$proxies" | "_$super" | "_importantEvts" | "afterCreated_" | "afterInit" | "$class" | "get$Class" | "$oid" | "$instanceof" | "$super" | "proxy" | "onHide" | "onFloatUp" | "onShow" | "destroy" | "redraw" | "bind" | "unbind" | "isOpen" | "getPosition" | "_shadow" | "syncShadow" | "_wgt" | "_content" | "setContent" | "_doMouseEnter" | "_doMouseLeave" | "_pp" | "hideShadow"

    • F extends any

    Parameters

    • name: M

      the method name to invoke

    • args: Parameters<F>

      an array of arguments. In most case, you just pass arguments (the built-in variable).

    Returns ReturnType<F>

    the object being returned by the method of the superclass.

    See

    zk.Object.$super

  • $supers<M, F>(klass, name, args): ReturnType<F>

  • Invokes a method defined in the superclass with an array of arguments. It is like Function's apply() that takes an array of arguments.

    It is similar to zk.Object.$supers, but this method works even if the superclass calls back the same member method. In short, it is tedious but safer.

    Example: ```ts foo.MyClass = zk.$extends(foo.MySuper, { multiply: function () { return this.$supers(foo.MyClass, 'multiply', arguments); } ```

    Notice that the class specified in the first argument is not the super class having the method. Rather, it is the class that invokes this method.

    Type Parameters

    • M extends "$init" | "$supers" | "_$ais" | "_$supers" | "_$proxies" | "_$super" | "_importantEvts" | "afterCreated_" | "afterInit" | "$class" | "get$Class" | "$oid" | "$instanceof" | "$super" | "proxy" | "onHide" | "onFloatUp" | "onShow" | "destroy" | "redraw" | "bind" | "unbind" | "isOpen" | "getPosition" | "_shadow" | "syncShadow" | "_wgt" | "_content" | "setContent" | "_doMouseEnter" | "_doMouseLeave" | "_pp" | "hideShadow"

    • F extends any

    Parameters

    • klass: typeof ZKObject

      the class that invokes this method.

    • name: M

      the method name to invoke

    • args: Parameters<F>

      an array of arguments. In most case, you just pass arguments (the built-in variable).

    Returns ReturnType<F>

    the object being returned by the method of the superclass.

    See

    zk.Object.$super

    Since

    5.0.2

afterInit

  • afterInit(func): void

  • Specifies a function that shall be called after the object is initialized, i.e., after zk.Object.$init is called. This method can be called only during the execution of zk.Object.$init.

    It is an advance feature that is used to allow a base class to do something that needs to wait for all deriving classes have been initialized.

    Invocation Sequence:

    • The most derived class's $init (subclass)
    • The based class's $init (if the derived class's $init invokes this.$supers('$init', arguments))
    • The first function, if any, be added with afterInit, then the second (in the same order that afterInit was called)...

    Parameters

    • func: CallableFunction

      the function to register for execution later

    Returns void

    See

    zk.Object.$init

    Deprecated

    as of 10.0 released. Using afterCreated_ instead.

bind

  • bind(): void

  • Returns void

destroy

  • destroy(): void

  • Returns void

get$Class

  • get$Class<T>(): T

  • Type Parameters

    Returns T

    the class of the subsclass which extends from zk.Class.

    Since

    10.0.0

getPosition

  • getPosition(): "end_before" | "after_start"

  • Returns "end_before" | "after_start"

hideShadow

  • hideShadow(): void

  • Returns void

isOpen

  • isOpen(): boolean

  • Returns boolean

onFloatUp

onHide

  • onHide(): void

  • Returns void

onShow

  • onShow(): void

  • Returns void

proxy

  • proxy<A, R>(func): ((...args) => R)

  • Proxies a member function such that it can be called with this object in a context that this object is not available. It sounds a bit strange at beginning but useful when passing a member of an object that will be executed as a global function.

    Example: Let us say if you want a member function to be called periodically, you can do as follows. ```ts setInterval(wgt.proxy(wgt.doIt), 1000); //assume doIt is a member function of wgt ```

    With proxy, when doIt is called, this references to wgt. On the other hand, the following won't work since this doesn't reference to wgt, when doIt is called. ```ts setInterval(wgt.doIt, 1000); //WRONG! doIt will not be called with wgt ```

    Notice that this method caches the result so that it will return the same proxied function, if you pass the same function again.

    Type Parameters

    • A extends unknown[]

    • R

    Parameters

    • func: ((...args) => R)

      a method member of this object

        • (...args): R

        • Parameters

          • Rest ...args: A

          Returns R

    Returns ((...args) => R)

    a function that can be called as a global function (that actually have this referencing to this object).

      • (...args): R

      • Parameters

        • Rest ...args: A

        Returns R

  • proxy<A0, A, R>(func): ((arg0, ...args) => R)

  • Type Parameters

    • A0

    • A extends unknown[]

    • R

    Parameters

    • func: ((arg0, ...args) => R)
        • (arg0, ...args): R

        • Parameters

          • arg0: A0
          • Rest ...args: A

          Returns R

    Returns ((arg0, ...args) => R)

      • (arg0, ...args): R

      • Parameters

        • arg0: A0
        • Rest ...args: A

        Returns R

  • proxy<A0, A1, A, R>(func): ((arg0, arg1, ...args) => R)

  • Type Parameters

    • A0

    • A1

    • A extends unknown[]

    • R

    Parameters

    • func: ((arg0, arg1, ...args) => R)
        • (arg0, arg1, ...args): R

        • Parameters

          • arg0: A0
          • arg1: A1
          • Rest ...args: A

          Returns R

    Returns ((arg0, arg1, ...args) => R)

      • (arg0, arg1, ...args): R

      • Parameters

        • arg0: A0
        • arg1: A1
        • Rest ...args: A

        Returns R

  • proxy<A0, A1, A2, A, R>(func): ((arg0, arg1, arg2, ...args) => R)

  • Type Parameters

    • A0

    • A1

    • A2

    • A extends unknown[]

    • R

    Parameters

    • func: ((arg0, arg1, arg2, ...args) => R)
        • (arg0, arg1, arg2, ...args): R

        • Parameters

          • arg0: A0
          • arg1: A1
          • arg2: A2
          • Rest ...args: A

          Returns R

    Returns ((arg0, arg1, arg2, ...args) => R)

      • (arg0, arg1, arg2, ...args): R

      • Parameters

        • arg0: A0
        • arg1: A1
        • arg2: A2
        • Rest ...args: A

        Returns R

  • proxy<A0, A1, A2, A3, A, R>(func): ((arg0, arg1, arg2, arg3, ...args) => R)

  • Type Parameters

    • A0

    • A1

    • A2

    • A3

    • A extends unknown[]

    • R

    Parameters

    • func: ((arg0, arg1, arg2, arg3, ...args) => R)
        • (arg0, arg1, arg2, arg3, ...args): R

        • Parameters

          • arg0: A0
          • arg1: A1
          • arg2: A2
          • arg3: A3
          • Rest ...args: A

          Returns R

    Returns ((arg0, arg1, arg2, arg3, ...args) => R)

      • (arg0, arg1, arg2, arg3, ...args): R

      • Parameters

        • arg0: A0
        • arg1: A1
        • arg2: A2
        • arg3: A3
        • Rest ...args: A

        Returns R

redraw

  • redraw(out): void

  • Parameters

    • out: string[]

    Returns void

setContent

  • setContent(content): this

  • Parameters

    • content: undefined | string

    Returns this

syncShadow

  • syncShadow(): void

  • Returns void

unbind

  • unbind(): void

  • Returns void

Static isAssignableFrom

  • isAssignableFrom(cls): boolean

  • Determines if the class by this Class object is either the same as, or is a superclass of, the class represented by the specified Class parameter. Example:

    if (klass1.isAssignableFrom(klass2)) {
    }

    Parameters

    • cls: typeof ZKObject

      the Class object to be checked, such as zk.Widget.

    Returns boolean

    true if assignable

Static isInstance

  • isInstance<T>(this, o): o is InstanceType<T>

  • Determines if the specified Object is assignment-compatible with this Class. This method is equivalent to [[zk.Object#$instanceof]. Example:

    if (klass.isInstance(obj)) {
    }

    Type Parameters

    Parameters

    • this: T
    • o: unknown

      the object to check

    Returns o is InstanceType<T>

    true if the object is an instance

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