MACROMEDIA FLEX-CREATING ADVANCED COMPONENTS Instrukcja Użytkownika Pobierz pdf (Strona 45)

{

var event:Event = PropertyChangeEvent

.createUpdateEvent(this, "value", null,

value);

dispatch(event);

}

Bind a single value property.

For example:

proxy.bind(propertyName, null, bindingId, BindingDirection.INPUT, InputBindings.SINGLETON, "");

Bind an array as a 2D array.

For example:

proxy.bind(propertyName, null, bindingId, BindingDirection.INPUT, InputBindings.ARRAY2D, "");

Bind an array as a 1D array.

For example:

proxy.bind(propertyName, null, bindingId, BindingDirection.INPUT, InputBindings.ARRAY, "");

12.2.4 Sub-element and Sub-property Binding

Most connections allow binding property sub-elements or sub-properties that are of Array type to the

Excel spreadsheet. For example of a sub-element binding, the RSS Connector has a property called

rssItems that contains all of the feed items returned from the loading process. Each feed item has a

title, a description, a link, and a published date. You can then bind an individual feed item or each

element of a single feed, such as title, to the Excel spreadsheet. Refer to the sample "RSS Connector

With Trigger" and its source code for an example.

To use sub-element or sub-property binding, first create a chain accessor, which provides a mechanism

to access and assign a specific element or property within an Array, and pass it as the second parameter

to the bind method of the property sheet proxy as follows:

Sub-element binding:

// create a chain to bind to rssItems[0]

var chain:Array = [0]; //access first feed item: an array of 4 elements

// binding to rssItems

proxy.bind("rssItems", chain, bindingID, BindingDirection.INPUT, InputBindings.ARRAY, "");

// create a chain to bind to rssItems[0][2]

var chain:Array = [0, 2]; //access the third element of the first feed item

// binding to rssItems

proxy.bind("rssItems", chain, bindingID, BindingDirection.INPUT, InputBindings.SINGLETON, "");

Sub-property binding:

// create a chain to bind to sub-property data[0].xValue

var chain:Array = [0, "xValue"]; //access xValue property of the first object

// binding to property "data"

proxy.bind("data", chain, bindingID, BindingDirection.INPUT, InputBindings.SINGLETON, "");

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Appendix B: Custom Property Sheet API Reference

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MACROMEDIA FLEX-CREATING ADVANCED COMPONENTS Instrukcja Użytkownika Strona 45