BindinUtils.bindProperty 方法中的函数/三元运算符

发布于 2024-12-25 20:49:00 字数 717 浏览 0 评论 0原文

我的 mxml 中有一个这样的标签；

   <s:Label id="lblChange" text="{_symbol.change>0 ?  '+' + _symbol.change:_symbol.change}" />

这工作得很好，但我需要用 BindingUitls 替换通过大括号的绑定，像这样；

_changeWatcher = BindingUtils.bindProperty(lblChange, "text", _symbol, "change");

同样，工作正常，但没有 if/else 情况。所以我想我可以写一个函数来做到这一点；

private function checkValue(val:Number):String {
    if (val > 0)
        return "+"+val;
    else
        return val as String;
}

并将其用作 bindProperty 调用中的属性而不是更改；

.bindProperty(lblChange, "text", _symbol, checkValue(_symbol.change));

然而，bindProperty 似乎在这里只接受字符串。那么有什么方法可以绕过这个“功能”呢？

原文

I've got a label in my mxml like this;

   <s:Label id="lblChange" text="{_symbol.change>0 ?  '+' + _symbol.change:_symbol.change}" />

This works perfectly fine, but I need to replace the binding via curly brackets with BindingUitls, something like this;

_changeWatcher = BindingUtils.bindProperty(lblChange, "text", _symbol, "change");

Again, works fine, but without the if/else case. So I though I could just write a function to do that;

private function checkValue(val:Number):String {
    if (val > 0)
        return "+"+val;
    else
        return val as String;
}

and use it as a property in the bindProperty call instead of change;

.bindProperty(lblChange, "text", _symbol, checkValue(_symbol.change));

However, bindProperty seems to accept nothing but strings here. So what way is there to get around this 'feature'?

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少钕鈤記 2025-01-01 20:49:00

试试这个：

BindingUtils.bindSetter(checkValue, _symbol, "change");

private function checkValue(object:Object):void {
    var val:Number = object as Number;
    if (val > 0)
        lblChange.text = "+"+val.toString();
    else
        lblChange.text = val.toString();
}

Try this:

BindingUtils.bindSetter(checkValue, _symbol, "change");

private function checkValue(object:Object):void {
    var val:Number = object as Number;
    if (val > 0)
        lblChange.text = "+"+val.toString();
    else
        lblChange.text = val.toString();
}

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