Using multiLine and TextMetrics

Using multiLine and TextMetrics : MouseEvent : TextField Flash / Flex / ActionScript examples

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Using multiLine and TextMetrics


 
package
{
import flash.display.Sprite;

import flash.text.TextField;
import flash.events.MouseEvent;
import flash.text.TextFormat;
import flash.display.StageAlign;
import flash.display.StageScaleMode;
public class Main extends Sprite
{
    private var multilineField:TextField;
    private var redFormat:TextFormat;
    private var blackFormat:TextFormat;

    public function Main()
    {
        stage.align = StageAlign.TOP_LEFT;
        stage.scaleMode = StageScaleMode.NO_SCALE;

        redFormat = new TextFormat();
        redFormat.color = 0xFF0000;

        blackFormat = new TextFormat();
        blackFormat.color = 0x000000;

        multilineField = new TextField();
        multilineField.multiline = true;
        multilineField.wordWrap = true;
        multilineField.height = 400;
        multilineField.width = 400;
        multilineField.mouseEnabled = true;
        multilineField.addEventListener(MouseEvent.MOUSE_MOVE, 
            getMouseOverLine);
        multilineField.addEventListener(MouseEvent.MOUSE_OUT, 
            getMouseOutLine);
        multilineField.text = "Returns .";

        addChild(multilineField);
    }

    private function getMouseOverLine(mouseEvent:MouseEvent):void
    {
        var characterInLine:int = multilineField.getCharIndexAtPoint(10, mouseEvent.stageY);
        if(characterInLine != -1) {
            var lineIndex:int =  multilineField.getLineIndexOfChar(characterInLine);

            var firstCharIndex:int = multilineField.getLineOffset(lineIndex);

            var lastCharIndex:int = firstCharIndex + multilineField.getLineLength(lineIndex);

            multilineField.setTextFormat(blackFormat); 
            multilineField.setTextFormat(redFormat,firstCharIndex, lastCharIndex);
        }
    }

    private function getMouseOutLine(mouseEvent:MouseEvent):void
    {
        multilineField.setTextFormat(blackFormat);
    }
}
}