AutoSizing Flex Mobile spark textarea组件
我想让我的移动火花textarea组件包装所有内容。 我发现了mx_internal这样做的方式，但我无法调用mx_internal :: getTextField（）。numLines方法 - 没有这样的...以前做过这些的任何人？
这是一个移动解决方案：
for(var i:int=0; i < StyleableTextField(txt_genel.textDisplay).numLines; i++) {
ta_height += StyleableTextField(txt_genel.textDisplay).getLineMetrics(i).height;
}
txt_genel.height = ta_height;
这里有一个自定义的TextArea类的解决方案，有评论来解释一点。
package
{
import mx.events.FlexEvent;
import spark.components.TextArea;
import spark.components.supportClasses.StyleableStageText;
import spark.events.TextOperationEvent;
public class CustomTextArea extends TextArea
{
private var _lineNumber:int = 1;
private var _padding:int;
private var _minHeight:int;
public function CustomTextArea()
{
super();
addEventListener(FlexEvent.CREATION_COMPLETE, function setBehaviour(event:FlexEvent):void
{
//minHeight to prevent textarea to be too small
_minHeight = height;
//padding between textarea and text component inside to calculate line number
_padding = ((textDisplay as StyleableStageText).x - x) + (width - (textDisplay as StyleableStageText).width);
//listener for text changing
addEventListener(TextOperationEvent.CHANGE, setHeight);
});
}
private function setHeight(event:TextOperationEvent):void
{
//line number is textwidth divided by component width
_lineNumber = (((textDisplay as StyleableStageText).measureText(text).width + _lineNumber * _padding) / width) + 1;
//text height is line number * text height
var newHeight:int = _lineNumber * (textDisplay as StyleableStageText).measureText(text).height;
//if new height > min height, set height
if (newHeight > _minHeight)
height = newHeight;
}
}
}
希望这会有所帮助。
编辑：有大量的线条，TextArea的高度上升太多。 应该管理。
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