Question

我希望能够在文本字段中编写段落，然后单击并按住，或执行类似的手势，并选择整个段落。然后我将它（使用bitmapdata或其他）拖到另一个文本域。

为了做到这一点，我需要能够检测给定段落的结束位置。所以我试着用下面的代码来做，在文本中搜索“\ n”。它找不到它。任何人都可以看到为什么（或建议另一种技术）？

TIA，

大卫

package
{
import flash.display.Sprite;
import flash.events.Event;
import flash.events.MouseEvent;
import flash.text.TextField;
import flash.text.TextFieldType;

import view.controls.CustomButton;

public class Main extends Sprite
{
    private var bt:CustomButton;
    private var tf:TextField;

    public function Main()
    {
        tf = new TextField();
        tf.name = "tfield";
        tf.type = TextFieldType.INPUT;
        tf.width = 400;
        tf.height = 200;
        tf.x = 100;
        tf.y = 100;
        tf.selectable = true;
        tf.border = true;
        tf.background = true;
        tf.backgroundColor = 0xFFFFFF;
        tf.multiline = true;
        tf.text = "Like most of the things I get excited about and share with you, this technique really doesn’t have much to it, but I love its elegance, how it works in the background and gets out of your way. While it’s really simple I think this one is a real gem, ’cause when you look at a class that uses it, it looks like magic!\n\nOkay, so you know how when you’re writing a site or app that’s of a small to medium scale, you default to storing data in XML, and you map that XML to model classes, usually pretty directly? Or, maybe you use a configuration file for your site to load in some constants or something, and XML is a pretty easy choice for this. With E4X you can really parse through that XML quickly.";
        tf.wordWrap = true;
        addChild(tf);

        bt = new CustomButton("Detect", 0xFFFFFF, 0x000000,50,20);
        bt.x = 250;
        bt.y = 350;
        addChild(bt);
        addEventListener(Event.ADDED_TO_STAGE, init);

    }

    private function init(e:Event):void
    {
        bt.addEventListener(MouseEvent.CLICK, clickHandler);
    }

    private function clickHandler(e:MouseEvent):void
    {
        var lineBreak:int = tf.text.indexOf("\n");
        trace(lineBreak);
    }
}
}
//custom button class

package view.controls

{ import flash.display.GradientType; import flash.display.SimpleButton; import flash.display.Sprite; import flash.display.Stage; import flash.events.Event; import flash.geom.Matrix; import flash.text.TextField; import flash.text.TextFormat; import flash.text.TextFormatAlign;

public class CustomButton extends Sprite
{
    private var textColor:uint = 0x000000;
    private var myColor:uint = 0xFEEE9E9;
    private var btnWidth:Number;
    private var btnHeight:Number;

    public function CustomButton(buttonText:String, gradientColor:uint, borderColor:uint, myBtnWidth:Number, myBtnHeight:Number)
    {
        var colors:Array = new Array();
        var alphas:Array = new Array(1, 1);
        var ratios:Array = new Array(0, 255);
        var gradientMatrix:Matrix = new Matrix();
        var lineThickness:Number = 1;
        //var myColor:uint = 0xFF0000;
        gradientMatrix.createGradientBox(myBtnWidth, myBtnHeight, Math.PI/2, 0, 0);

        this.btnWidth = myBtnWidth;
        this.btnHeight = myBtnHeight;
        var ellipseSize:int = 20;
        var btnUpState:Sprite = new Sprite();
        colors = [0xFFFFFF, myColor];
        //btnUpState.graphics.lineStyle(1, brightencolor(myColor, -500));
        btnUpState.graphics.lineStyle(lineThickness, borderColor);
        btnUpState.graphics.beginGradientFill(GradientType.LINEAR, colors, alphas, ratios, gradientMatrix);
        btnUpState.graphics.drawRoundRect(0, 0, myBtnWidth, myBtnHeight, ellipseSize, ellipseSize);
        btnUpState.addChild(createButtonTextField(buttonText, textColor));
        //
        var btnOverState:Sprite = new Sprite();
        colors = [0xFFFFFF, brightencolor(myColor, 50)];
        //btnOverState.graphics.lineStyle(1, brightencolor(myColor, -50));
        btnOverState.graphics.lineStyle(lineThickness, borderColor);
        btnOverState.graphics.beginGradientFill(GradientType.LINEAR, colors, alphas, ratios, gradientMatrix);
        btnOverState.graphics.drawRoundRect(0, 0, myBtnWidth, myBtnHeight, ellipseSize, ellipseSize);
        btnOverState.addChild(createButtonTextField(buttonText, textColor))
        //
        var btnDownState:Sprite = new Sprite();
        //colors = [brightencolor(myColor, -15), brightencolor(myColor, 50)];
        btnDownState.graphics.lineStyle(lineThickness, borderColor);
        btnDownState.graphics.beginGradientFill(GradientType.LINEAR, colors, alphas, ratios, gradientMatrix);
        btnDownState.graphics.drawRoundRect(0, 0, myBtnWidth, myBtnHeight, ellipseSize, ellipseSize);
        btnDownState.addChild(createButtonTextField(buttonText, textColor))
        //
        this.btnWidth = myBtnWidth;
        this.btnHeight = myBtnHeight;

        var myButton:SimpleButton = new SimpleButton(btnUpState, btnOverState, btnDownState, btnOverState);
        myButton.name = buttonText;
        addChild(myButton);

    }


    private function createButtonTextField(Text:String, textcolor:uint):TextField {
        var myTextField:TextField = new TextField();
        myTextField.textColor = textcolor;
        myTextField.selectable = false;
        myTextField.width = btnWidth;
        myTextField.height = btnHeight;
        var myTextFormat:TextFormat = new TextFormat();
        myTextFormat.align = TextFormatAlign.CENTER;
        myTextFormat.font = "Arial";
        myTextFormat.size = 12;
        myTextField.defaultTextFormat = myTextFormat;

        myTextField.text = Text;
        myTextField.x = (btnWidth/2)-(myTextField.width/2);
        myTextField.y = 1;
        return myTextField;
    }

    private function brightencolor(color:int, modifier:int):int {
        var hex:Array = hexToRGB(color);
        var red:int = keepInBounds(hex[0]+modifier);
        var green:int = keepInBounds(hex[1]+modifier);
        var blue:int = keepInBounds(hex[2]+modifier);
        return RGBToHex(red, green, blue);
    }

    private function hexToRGB (hex:uint):Array {
        var colors:Array = new Array(); 
        colors.push(hex >> 16);
        var temp:uint = hex ^ colors[0] << 16;
        colors.push(temp >> 8);
        colors.push(temp ^ colors[1] << 8);
        return colors;
    }

    private function keepInBounds(number:int):int {
        if (number < 0)    number = 0;
        if (number > 255) number = 255;
        return number;
    }    
    private function RGBToHex(uR:int, uG:int, uB:int):int {
        var uColor:uint;
        uColor =  (uR & 255) << 16;
        uColor += (uG & 255) << 8;
        uColor += (uB & 255);
        return uColor;
    }
}
}

Answer 1

import flash.text.TextField;
import flash.text.TextFieldType;
import flash.display.Sprite;
import flash.events.MouseEvent;

var tf:TextField = new TextField();
tf.type = TextFieldType.INPUT;
tf.width = 400;
tf.height = 200;
tf.x = stage.stageWidth / 2 - tf.width / 2;
tf.y = stage.stageHeight / 2 - tf.height / 2;
tf.selectable = true;
tf.border = true;
tf.background = true;
tf.backgroundColor = 0xCCCCCC;
tf.multiline = true;
tf.wordWrap = true;
tf.text = "Enter text here, hit enter to create new paragraphs."
stage.addChild(tf);

var pushme:Sprite = new Sprite();
pushme.graphics.beginFill(0xCCCCCC, 1);
pushme.graphics.drawRect(0, 0, 100, 25);
pushme.graphics.endFill();
pushme.buttonMode = true;
pushme.addEventListener(MouseEvent.CLICK, pushedme);
pushme.x = tf.x + tf.width - pushme.width;
pushme.y = tf.y + tf.height + 15;
stage.addChild(pushme);

function pushedme(e:MouseEvent):void {
    var paragraphCounter:int = 1;
    var curParagraphOffset:int = -1;
    for (var i:int = 0; i < tf.numLines; i++) {
        if (tf.getFirstCharInParagraph(tf.getLineOffset(i)) == tf.getLineOffset(i) && tf.getFirstCharInParagraph(tf.getLineOffset(i)) > curParagraphOffset) {
            trace("Paragraph " + paragraphCounter + " text: \n" + tf.text.substr(tf.getFirstCharInParagraph(tf.getLineOffset(i)), tf.getParagraphLength(tf.getFirstCharInParagraph(tf.getLineOffset(i)))));
            paragraphCounter++;
            curParagraphOffset = tf.getFirstCharInParagraph(tf.getLineOffset(i));
        }
    }
}

段落检测

Paragraph Detection

一步一步

你可以从这里拿走它并忽略空段落，但要解释：

设置文本字段，手动输入更多文本（如图所示）
创建按钮以检查段落
将段落计数器设置为1，以便正确输出第一个检测到的段落
对于第一次迭代要满足的if语句，段落偏移量必须为-1，因为第一段应该是字符0
如果段落中的第一个字符也是此行中的第一个字符，而我们不是上一段的一部分，则我们在此行中有一个新段落。
通过获取tf.text属性的子字符串，根据段落的第一个字符和长度输出段落文本。
增加paragraphCounter并将curParagraphOffset设置为新的第一个字符索引。

如果您希望能够点击并按住给定的段落，您需要做的只是致电：

tf.getCharIndexAtPoint(x, y)

单击您的文本字段。然后，您可以找到该段落中的第一个字符，根据段落长度获取子字符串，然后从那里开始。

希望这有帮助！

检测AS3输入TextField中的换行符

1 个答案: