Flex - 将参数发送到自定义 ItemRenderer? [英] Flex - Sending a parameter to a custom ItemRenderer?

问题描述

我想要完成的工作是让我的 Flex Datagrid 中的财务数据进行颜色编码——如果它是积极的，则为绿色；如果是负数则为红色.如果我想要着色的列是 dataProvider 的一部分，这将相当简单.相反，我根据属于 dataProvider 的另外两列计算它.这仍然相当简单，因为我可以在 ItemRenderer 中再次计算它，但计算的另一部分是基于 textBox 的值.所以，我认为我需要能够做的是将 textBox 的值发送到自定义 ItemRenderer，但由于该值存储在主 MXML 应用程序中，我不知道如何访问它.将其作为参数发送似乎是最好的方式，但也许还有另一种方式.

What I am trying to accomplish to to get financial data in my Flex Datagrid to be color-coded--green if it's positive; red if it's negative. This would be fairly straightforward if the column I want colored was part of the dataProvider. Instead, I am calculating it based on two other columns that are part of the dataProvider. That would still be fairly straightforward because I could just calculate it again in the ItemRenderer, but another part of the calculation is based on the value of a textBox. So, what I think I need to be able to do is send the value of the textBox to the custom ItemRenderer, but since that value is stored in the main MXML Application, I don't know how to access it. Sending it as a parameter seems like the best way, but perhaps there's another.

这是我的 ItemRenderer 的当前代码:

Here is the current code for my ItemRenderer:

package {
import mx.controls.Label;
import mx.controls.listClasses.*;

public class PriceLabel extends Label {
    private const POSITIVE_COLOR:uint = 0x458B00 // Green
    private const NEGATIVE_COLOR:uint = 0xFF0000; // Red 

    override protected function updateDisplayList(unscaledWidth:Number, unscaledHeight:Number):void {
        super.updateDisplayList(unscaledWidth, unscaledHeight);

        /* Set the font color based on the item price. */
        setStyle("color", (data.AvailableFunding >= 0) ? NEGATIVE_COLOR : POSITIVE_COLOR);
    }
}

(data.AvailableFunding 不存在)

(data.AvailableFunding doesn't exist)

那么有谁知道我将如何完成这项工作?

So does anyone know how I would go about accomplishing this?

推荐答案

您可能需要查看 ClassFactory 来自 Flex API:

You may want to look into ClassFactory from the Flex APIs:

这允许您设置具有任意类型/值的原型对象，每个类型/值都将传递给项目渲染器.来自示例:

This allows you to set a prototype Object with arbitrary types / values each of which will be passed to the item renderer. From the sample:

var productRenderer:ClassFactory = new ClassFactory(ProductRenderer);
productRenderer.properties = { showProductImage: true };
myList.itemRenderer = productRenderer;

上面的代码假设ProductRenderer"有一个名为showProductImage"的公共属性，该属性将被设置为true".

The above code assumed that "ProductRenderer" has a public property called "showProductImage" which will be set with a value of "true."

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