菜鸟求助Flex的问题

Sky-Tiger

You can use functions for binding in two ways: passing a bound property as the argument to a function or defining a function as bound to a property.

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To bind to a function without passing a bound property as an argument, you can use the event attribute of the [Binding] metadata tag to define a function as being bindable to an event. When the specified event is captured, the function is invoked and enforces an update to any bound properties. Consider an example:

Sky-Tiger

States are a powerful tool that encapsulate a lot of the work of creating stateful components, that is, components that have multiple views. These could be controls that need to operate as both an editor and a display, a dialog box with multiple screens, or a component with a menu view and detail view. These multiple views, when contained within a single component, are referred to as states. The Flex Framework defines a class called State, contained within the mx.state package, that lets you define the properties of a particular view within a single component. All UIComponents let you add one or more mx.state.State objects to their states array, which enables you to easily add and remove any child components, control styles, and use Effects and Transitionswhen a State is entered or exited.

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States can add children to a component that will be removed by the component as soon as the state is exited. You also can define transitions that will play as the currentState of a component is changed and apply effects to selected children any time the state property is changed. Any properties of a component that are meant to be temporary or that are relevant only to a certain state of a component can be easily and efficiently implemented in a state.