Flash Text Engine 예제: 뉴스 레이아웃
Flash Player 10 이상, Adobe AIR 1.5 이상
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이 프로그래밍 예제에서는 Flash Text Engine을 사용하여 간단한 신문 페이지의 레이아웃을 지정하는 방법을 보여 줍니다. 페이지에는 큰 헤드라인, 소제목, 여러 열로 구성된 본문 섹션이 포함됩니다.
먼저 FLA 파일을 만들고 다음 코드를 기본 레이어의 프레임 #2에 연결합니다.
import com.example.programmingas3.newslayout.StoryLayout ;
// frame sc ript - create a 3-columned arti cle layout
var story:StoryLayout = new StoryLayout(720, 500, 3, 10);
story.x = 20;
story.y = 80;
addChild(story);
stop();
StoryLayout.as는 이 예제의 컨트롤러 스크립트입니다. 내용을 설정하고 외부 스타일 시트에서 스타일 정보를 읽어 ElementFormat 객체에 해당 스타일을 할당합니다. 그런 다음 헤드라인, 소제목 및 여러 열로 구성된 텍스트 요소를 만듭니다.
package com.example.programmingas3.newslayout
{
import flash.display.Sprite;
import flash.text.StyleSheet;
import flash.text.engine.*;
import flash.events.Event;
import flash.net.URLRequest;
import flash.net.URLLoader;
import flash.display.Sprite;
import flash.display.Graphics;
public class StoryLayout extends Sprite
{
public var headlineTxt:HeadlineTextField;
public var subtitleTxt:HeadlineTextField;
public var storyTxt:MultiColumnText;
public var sheet:StyleSheet;
public var h1_ElFormat:ElementFormat;
public var h2_ElFormat:ElementFormat;
public var p_ElFormat:ElementFormat;
private var loader:URLLoader;
public var paddingLeft:Number;
public var paddingRight:Number;
public var paddingTop:Number;
public var paddingBottom:Number;
public var preferredWidth:Number;
public var preferredHeight:Number;
public var numColumns:int;
public var bgColor:Number = 0xFFFFFF;
public var headline:String = "News Layout Example";
public var subtitle:String = "This example formats text like a newspaper page using the Flash Text Engine API. ";
public var rawTestData:String =
"From the part Mr. Burke took in the American Revolution, it was natural that I should consider him a friend to mankind; and as our acquaintance commenced on that ground, it would have been more agreeable to me to have had cause to continue in that opinion than to change it. " +
"At the time Mr. Burke made his violent speech last winter in the English Parliament against the French Revolution and the National Assembly, I was in Paris, and had written to him but a short time before to inform him how prosperously matters were going on. Soon after this I saw his advertisement of the Pamphlet he intended to publish: As the attack was to be made in a language but little studied, and less understood in France, and as everything suffers by translation, I promised some of the friends of the Revolution in that country that whenever Mr. Burke's Pamphlet came forth, I would answer it. This appeared to me the more necessary to be done, when I saw the flagrant misrepresentations which Mr. Burke's Pamphlet contains; and that while it is an outrageous abuse on the French Revolution, and the principles of Liberty, it is an imposition on the rest of the world. " +
"I am the more astonished and disappointed at this conduct in Mr. Burke, as (from the circumstances I am going to mention) I had formed other expectations. " +
"I had seen enough of the miseries of war, to wish it might never more have existence in the world, and that some other mode might be found out to settle the differences that should occasionally arise in the neighbourhood of nations. This certainly might be done if Courts were disposed to set honesty about it, or if countries were enlightened enough not to be made the dupes of Courts. The people of America had been bred up in the same prejudices against France, which at that time characterised the people of England; but experience and an acquaintance with the French Nation have most effectually shown to the Americans the falsehood of those prejudices; and I do not believe that a more cordial and confidential intercourse exists between any two countries than between America and France. ";
public function StoryLayout(w:int = 400, h:int = 200, cols:int = 3, padding:int = 10):void
{
this.preferredWidth = w;
this.preferredHeight = h;
this.numColumns = cols;
this.paddingLeft = padding;
this.paddingRight = padding;
this.paddingTop = padding;
this.paddingBottom = padding;
var req:URLRequest = new URLRequest("story.css");
loader = new URLLoader();
loader.addEventListener(Event.COMPLETE, onCSSFileLoaded);
loader.load(req);
}
public function onCSSFileLoaded(event:Event):void
{
this.sheet = new StyleSheet();
this.sheet.parseCSS(loader.data);
// convert headline styles to ElementFormat objects
h1_ElFormat = getElFormat("h1", this.sheet);
h1_ElFormat.typographicCase = TypographicCase.UPPERCASE;
h2_ElFormat = getElFormat("h2", this.sheet);
p_ElFormat = getElFormat("p", this.sheet);
displayText();
}
public function drawBackground():void
{
var h:Number = this.storyTxt.y + this.storyTxt.height +
this.paddingTop + this.paddingBottom;
var g:Graphics = this.graphics;
g.beginFill(this.bgColor);
g.drawRect(0, 0, this.width + this.paddingRight + this.paddingLeft, h);
g.endFill();
}
/**
* Reads a set of style properties for a named style and then creates
* a TextFormat object that uses the same properties.
*/
public function getElFormat(styleName:String, ss:StyleSheet):ElementFormat
{
var style:Object = ss.getStyle(styleName);
if (style != null)
{
var colorStr:String = style.color;
if (colorStr != null && colorStr.indexOf("#") == 0)
{
style.color = colorStr.substr(1);
}
var fd:FontDescription = new FontDescription(
style.fontFamily,
style.fontWeight,
FontPosture.NORMAL,
FontLookup.DEVICE,
RenderingMode.NORMAL,
CFFHinting.NONE);
var format:ElementFormat = new ElementFormat(fd,
style.fontSize,
style.color,
1,
TextRotation.AUTO,
TextBaseline.ROMAN,
TextBaseline.USE_DOMINANT_BASELINE,
0.0,
Kerning.ON,
0.0,
0.0,
"en",
BreakOpportunity.AUTO,
DigitCase.DEFAULT,
DigitWidth.DEFAULT,
LigatureLevel.NONE,
TypographicCase.DEFAULT);
if (style.hasOwnProperty("letterSpacing"))
{
format.trackingRight = style.letterSpacing;
}
}
return format;
}
public function displayText():void
{
headlineTxt = new HeadlineTextField(h1_ElFormat,headline,this.preferredWidth);
headlineTxt.x = this.paddingLeft;
headlineTxt.y = 40 + this.paddingTop;
headlineTxt.fitText(1);
this.addChild(headlineTxt);
subtitleTxt = new HeadlineTextField(h2_ElFormat,subtitle,this.preferredWidth);
subtitleTxt.x = this.paddingLeft;
subtitleTxt.y = headlineTxt.y + headlineTxt.height;
subtitleTxt.fitText(2);
this.addChild(subtitleTxt);
storyTxt = new MultiColumnText(rawTestData, this.numColumns,
20, this.preferredWidth, this.preferredHeight, p_ElFormat);
storyTxt.x = this.paddingLeft;
storyTxt.y = subtitleTxt.y + subtitleTxt.height + 10;
this.addChild(storyTxt);
drawBackground();
}
}
}
FormattedTextBlock.as는 텍스트 블록을 만드는 기본 클래스로 사용됩니다. 여기에는 글꼴 크기와 대/소문자를 변경하는 유틸리티 함수도 포함되어 있습니다.
package com.example.programmingas3.newslayout
{
import flash.text.engine.*;
import flash.display.Sprite;
public class FormattedTextBlock extends Sprite
{
public var tb:TextBlock;
private var te:TextElement;
private var ef1:ElementFormat;
private var textWidth:int;
public var totalTextLines:int;
public var blockText:String;
public var leading:Number = 1.25;
public var preferredWidth:Number = 720;
public var preferredHeight:Number = 100;
public function FormattedTextBlock(ef:ElementFormat,txt:String, colW:int = 0)
{
this.textWidth = (colW==0) ? preferredWidth : colW;
blockText = txt;
ef1 = ef;
tb = new TextBlock();
tb.textJustifier = new SpaceJustifier("en",LineJustification.UNJUSTIFIED,false);
te = new TextElement(blockText,this.ef1);
tb.content = te;
this.breakLines();
}
private function breakLines()
{
var textLine:TextLine = null;
var y:Number = 0;
var lineNum:int = 0;
while (textLine = tb.createTextLine(textLine,this.textWidth,0,true))
{
textLine.x = 0;
textLine.y = y;
y += this.leading*textLine.height;
this.addChild(textLine);
}
for (var i:int = 0; i < this.numChildren; i++)
{
TextLine(this.getChildAt(i)).validity = TextLineValidity.STATIC;
}
this.totalTextLines = this.numChildren;
}
private function rebreakLines()
{
this.clearLines();
this.breakLines();
}
private function clearLines()
{
while(this.numChildren)
{
this.removeChildAt(0);
}
}
public function changeSize(size:uint=12):void
{
if (size > 5)
{
var ef2:ElementFormat = ef1.clone();
ef2.fontSize = size;
te.elementFormat = ef2;
this.rebreakLines();
}
}
public function changeCase(newCase:String = "default"):void
{
var ef2:ElementFormat = ef1.clone();
ef2.typographicCase = newCase;
te.elementFormat = ef2;
}
}
}
HeadlineTextBlock.as는 FormattedTextBlock 클래스를 확장하며 헤드라인을 만드는 데 사용됩니다. 여기에는 페이지에서 정의된 공간 내에 텍스트를 맞추는 함수가 포함되어 있습니다.
package com.example.programmingas3.newslayout
{
import flash.text.engine.*;
public class HeadlineTextField extends FormattedTextBlock
{
public static var MIN_POINT_SIZE:uint = 6;
public static var MAX_POINT_SIZE:uint = 128;
public function HeadlineTextField(te:ElementFormat,txt:String,colW:int = 0)
{
super(te,txt);
}
public function fitText(maxLines:uint = 1, targetWidth:Number = -1):uint
{
if (targetWidth == -1)
{
targetWidth = this.width;
}
var pixelsPerChar:Number = targetWidth / this.blockText.length;
var pointSize:Number = Math.min(MAX_POINT_SIZE,
Math.round(pixelsPerChar * 1.8 * maxLines));
if (pointSize < 6)
{
// the point size is too small
return pointSize;
}
this.changeSize(pointSize);
if (this.totalTextLines > maxLines)
{
return shrinkText(--pointSize, maxLines);
}
else
{
return growText(pointSize, maxLines);
}
}
public function growText(pointSize:Number, maxLines:uint = 1):Number
{
if (pointSize >= MAX_POINT_SIZE)
{
return pointSize;
}
this.changeSize(pointSize + 1);
if (this.totalTextLines > maxLines)
{
// set it back to the last size
this.changeSize(pointSize);
return pointSize;
}
else
{
return growText(pointSize + 1, maxLines);
}
}
public function shrinkText(pointSize:Number, maxLines:uint=1):Number
{
if (pointSize <= MIN_POINT_SIZE)
{
return pointSize;
}
this.changeSize(pointSize);
if (this.totalTextLines > maxLines)
{
return shrinkText(pointSize - 1, maxLines);
}
else
{
return pointSize;
}
}
}
}
MultiColumnText.as는 여러 열로 구성된 디자인에서 텍스트 서식 지정을 처리합니다. TextBlock 객체를 텍스트 행의 생성, 서식 지정 및 배치를 위한 팩토리로 유연하게 사용할 수 있음을 보여 줍니다.
package com.example.programmingas3.newslayout
{
import flash.display.Sprite;
import flash.text.engine.*;
public class MultiColumnText extends Sprite
{
private var tb:TextBlock;
private var te:TextElement;
private var numColumns:uint = 2;
private var gutter:uint = 10;
private var leading:Number = 1.25;
private var preferredWidth:Number = 400;
private var preferredHeight:Number = 100;
private var colWidth:int = 200;
public function MultiColumnText(txt:String = "",cols:uint = 2,
gutter:uint = 10, w:Number = 400, h:Number = 100,
ef:ElementFormat = null):void
{
this.numColumns = Math.max(1, cols);
this.gutter = Math.max(1, gutter);
this.preferredWidth = w;
this.preferredHeight = h;
this.setColumnWidth();
var field:FormattedTextBlock = new FormattedTextBlock(ef,txt,this.colWidth);
var totLines:int = field.totalTextLines;
field = null;
var linesPerCol:int = Math.ceil(totLines/cols);
tb = new TextBlock();
te = new TextElement(txt,ef);
tb.content = te;
var textLine:TextLine = null;
var x:Number = 0;
var y:Number = 0;
var i:int = 0;
var j:int = 0;
while (textLine = tb.createTextLine(textLine,this.colWidth,0,true))
{
textLine.x = Math.floor(i/(linesPerCol+1))*(this.colWidth+this.gutter);
textLine.y = y;
y += this.leading*textLine.height;
j++;
if(j>linesPerCol)
{
y = 0;
j = 0;
}
i++;
this.addChild(textLine);
}
}
private function setColumnWidth():void
{
this.colWidth = Math.floor( (this.preferredWidth -
((this.numColumns - 1) * this.gutter)) / this.numColumns);
}
}
}
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