Flash Cover Flow (part1)
Wednesday, January 13th, 2010
Web gallery built in flash to produce a coverflow like component.
This is an updated implementation of the popular coverflow way of display images. With the release of flash 10 with new 3D capabilities, this allows for a much easier and fast implantation of this popular web component.
File Main.AS
package {
////////////////////////////////////////////
// IMPORTS
////////////////////////////////////////////
//import flash.utils.*;
//import flash.media.*;
import flash.display.*;
import flash.events.*;
//import flash.net.*;
//import flash.text.*;
public class Main extends Sprite {
////////////////////////////////////////////
// VARIABLES
////////////////////////////////////////////
private var coverflow:Coverflow;
////////////////////////////////////////////
// CONSTRUCTOR - INITIAL ACTIONS
////////////////////////////////////////////
public function Main() {
setupStage();
//Resize Listener
stage.addEventListener(Event.RESIZE, resizeHandler);
resizeMe();
init();
}
////////////////////////////////////////////
// FUNCTIONS
////////////////////////////////////////////
public function setupStage():void {
stage.quality = StageQuality.HIGH;
stage.scaleMode = StageScaleMode.NO_SCALE;
stage.align = StageAlign.TOP_LEFT;
}
//Handles Resizing the Image
private function resizeHandler(event:Event):void {
resizeMe();
}
private function resizeMe():void {
//No Resizing for This
}
private function init():void {
coverflow = new Coverflow(stage.stageWidth, stage.stageHeight, stage);
addChild(coverflow);
}
}
}
File Coverflow.AS
package {
////////////////////////////////////////////
// IMPORTS
////////////////////////////////////////////
import flash.display.Sprite;
import flash.display.BitmapData;
import flash.display.Bitmap;
import flash.display.GradientType;
import flash.display.Graphics;
import flash.display.Shape;
import flash.display.MovieClip;
import flash.display.BlendMode;
import flash.display.Loader;
import flash.events.Event;
import flash.events.KeyboardEvent;
import flash.events.MouseEvent;
import flash.events.IOErrorEvent;
import flash.geom.Matrix;
import flash.geom.Rectangle;
import flash.geom.ColorTransform;
import flash.net.URLRequest;
import flash.net.URLLoader;
import flash.net.navigateToURL;
import flash.display.Stage;
import flash.utils.setTimeout;
//TweenLite - Tweening Engine - SOURCE: http://blog.greensock.com/tweenliteas3/
import com.greensock.*;
import com.greensock.easing.*;
public class Coverflow extends Sprite {
////////////////////////////////////////////
// VARIABLES
////////////////////////////////////////////
// size of the stage
private var sw:Number;
private var sh:Number;
// padding between each cover, can be customed via xml
private var coverflowSpacing:Number=30;
// transition time for movement
private var transitionTime:Number=0.75;
// the center of the stage
private var centerX:Number;
private var centerY:Number;
// store each image cover's instance
private var coverArray:Array=new Array();
// title of each image
private var coverLabel:CoverflowTitle = new CoverflowTitle();
// the slider under the image cover
private var coverSlider:Scrollbar;
// how many image covers
private var coverflowItemsTotal:Number;
// how to open the link
private var _target:String;
// size of the image cover
private var coverflowImageWidth:Number;
private var coverflowImageHeight:Number;
//Holds the objects in the data array
private var _data:Array = new Array();
// the y position of the item's title
private var coverLabelPositionY:Number;
//Z Position of Current CoverflowItem
private var centerCoverflowZPosition:Number=-125;
// display the middle of the cover or not
private var startIndexInCenter:Boolean=true;
// which cover to display in the beginning
private var startIndex:Number=0;
// the slide's Y position
private var coverSlidePositionY:Number;
//Holder for current CoverflowItem
private var _currentCover:Number;
//CoverflowItem Container
private var coverflowItemContainer:Sprite = new Sprite();
//XML Loading
private var coverflowXMLLoader:URLLoader;
//XML
private var coverflowXML:XML;
// the image cover's white border padding
private var padding:Number=4;
// stage reference
private var _stage:Stage;
//reflection
private var reflection:Reflect;
//Reflection Properties
private var reflectionAlpha:Number;
private var reflectionRatio:Number;
private var reflectionDistance:Number;
private var reflectionUpdateTime:Number;
private var reflectionDropoff:Number;
////////////////////////////////////////////
// CONSTRUCTOR - INITIAL ACTIONS
////////////////////////////////////////////
public function Coverflow(_width:Number, _height:Number, __stage:Stage = null):void {
_stage=__stage;
sw=_width;
sh=_height;
centerX=_width>>1;
centerY=(_height>>1) - 20;
loadXML();
if (_stage) {
_stage.addEventListener(KeyboardEvent.KEY_DOWN, keyDownHandler);
}
}
////////////////////////////////////////////
// FUNCTIONS
////////////////////////////////////////////
private function keyDownHandler(e:KeyboardEvent):void {
if (e.keyCode==37||e.keyCode==74) {
clickPre();
}
if (e.keyCode==39||e.keyCode==75) {
clickNext();
}
// 72 stand for "H" key, 191 stand for "?" key
if (e.keyCode==72||e.keyCode==191) {
}
}
// display the previous image
private function clickPre(e:Event=null):void {
_currentCover--;
if (_currentCover<0) {
_currentCover=coverflowItemsTotal-1;
}
coverSlider.value=_currentCover;
gotoCoverflowItem(_currentCover);
}
// display the next image
private function clickNext(e:Event=null):void {
_currentCover++;
if (_currentCover>coverflowItemsTotal-1) {
_currentCover=0;
}
coverSlider.value=_currentCover;
gotoCoverflowItem(_currentCover);
}
// loading the XML
private function loadXML():void {
// loading the cover xml here
coverflowXMLLoader = new URLLoader();
coverflowXMLLoader.load(new URLRequest("xml/data.xml"));
coverflowXMLLoader.addEventListener(Event.COMPLETE, coverflowXMLLoader_Complete);
coverflowXMLLoader.addEventListener(IOErrorEvent.IO_ERROR, coverflowXMLLoader_IOError);
}
// parse the XML
private function coverflowXMLLoader_Complete(e:Event):void {
coverflowXML=new XML(e.target.data);
coverflowItemsTotal=coverflowXML.cover.length();
coverflowSpacing=Number(coverflowXML.@coverflowSpacing);
coverflowImageWidth=Number(coverflowXML.@width);
coverflowImageHeight=Number(coverflowXML.@height);
coverLabelPositionY=Number(coverflowXML.@coverLabelPositionY);
coverSlidePositionY=Number(coverflowXML.@coverSlidePositionY);
transitionTime=Number(coverflowXML.@transitionTime);
centerCoverflowZPosition=Number(coverflowXML.@centerCoverflowZPosition);
//Reflection Attributes
reflectionAlpha=Number(coverflowXML.@reflectionAlpha);
reflectionRatio=Number(coverflowXML.@reflectionRatio);
reflectionDistance=Number(coverflowXML.@reflectionDistance);
reflectionUpdateTime=Number(coverflowXML.@reflectionUpdateTime);
reflectionDropoff=Number(coverflowXML.@reflectionDropoff);
startIndex=Number(coverflowXML.@startIndex);
startIndexInCenter = (coverflowXML.@startIndexInCenter.toLowerCase().toString()=="yes");
_target=coverflowXML.@target.toString();
for (var i=0; i<coverflowItemsTotal; i++) {
//Make An Object To Hold Values
var _obj:Object = new Object();
//Set Values To Object from XML for each CoverflowItem
_obj.image = (coverflowXML.cover[i].@img.toString());
_obj.title = (coverflowXML.cover[i].@title.toString());
_obj.link = (coverflowXML.cover[i].@link.toString());
_data[i] = _obj;
}
loadCover();
}
private function coverflowXMLLoader_IOError(event:IOErrorEvent):void {
trace("Coverflow XML Load Error: "+ event);
}
// load the image cover when xml is loaded
private function loadCover():void {
for (var i:int = 0; i < coverflowItemsTotal; i++) {
var cover:Sprite=createCover(i,_data[i].image);
coverArray[i]=cover;
cover.y=centerY;
cover.z=0;
coverflowItemContainer.addChild(cover);
}
if (startIndexInCenter) {
startIndex=coverArray.length>>1;
gotoCoverflowItem(startIndex);
} else {
gotoCoverflowItem(startIndex);
}
_currentCover=startIndex;
coverSlider=new Scrollbar(coverflowItemsTotal,_stage);
coverSlider.value=startIndex;
coverSlider.x = (_stage.stageWidth/2) - (coverSlider.width/2);
coverSlider.y=_stage.stageHeight-40;
coverSlider.addEventListener("UPDATE", coverSlider_Update);
coverSlider.addEventListener("PREVIOUS", coverSlider_Previous);
coverSlider.addEventListener("NEXT", coverSlider_Next);
addChild(coverSlider);
//coverLabel.x = (sw - coverLabel.width)>>1;
coverLabel.x = (_stage.stageWidth/2) - (coverLabel.width/2);
coverLabel.y=coverLabelPositionY;
addChild(coverLabel);
addChild(coverSlider);
addChild(coverLabel);
}
private function coverSlider_Update(e:Event):void {
var value:Number=(coverSlider.value);
gotoCoverflowItem(value);
e.stopPropagation();
}
private function coverSlider_Previous(e:Event):void {
clickPre();
}
private function coverSlider_Next(e:Event):void {
clickNext();
}
// move to a certain cover via number
private function gotoCoverflowItem(n:int):void {
_currentCover=n;
reOrderCover(n);
if (coverSlider) {
coverSlider.value=n;
}
}
private function cover_Selected(event:CoverflowItemEvent):void {
var currentCover:uint=event.data.id;
if (coverArray[currentCover].rotationY==0) {
try {
// open the link if user click the cover in the middle again
if (_data[currentCover].link!="") {
navigateToURL(new URLRequest(_data[currentCover].link), _target);
}
} catch (e:Error) {
//
}
} else {
gotoCoverflowItem(currentCover);
}
}
// change each cover's position and rotation
private function reOrderCover(currentCover:uint):void {
for (var i:uint = 0, len:uint = coverArray.length; i < len; i++) {
var cover:Sprite=coverArray[i];
if (i<currentCover) {
//Left Side
TweenLite.to(cover, transitionTime, {x:(centerX - (currentCover - i) * coverflowSpacing - coverflowImageWidth/2), z:(coverflowImageWidth/2), rotationY:-65});
} else if (i > currentCover) {
//Right Side
TweenLite.to(cover, transitionTime, {x:(centerX + (i - currentCover) * coverflowSpacing + coverflowImageWidth/2), z:(coverflowImageWidth/2), rotationY:65});
} else {
//Center Coverflow
TweenLite.to(cover, transitionTime, {x:centerX, z:centerCoverflowZPosition, rotationY:0});
//Label Handling
coverLabel._text.text=_data[i].title;
coverLabel.alpha=0;
TweenLite.to(coverLabel, 0.75, {alpha:1,delay:0.2});
}
}
for (i = 0; i < currentCover; i++) {
addChild(coverArray[i]);
}
for (i = coverArray.length - 1; i > currentCover; i--) {
addChild(coverArray[i]);
}
addChild(coverArray[currentCover]);
if (coverSlider) {
addChild(coverSlider);
addChild(coverLabel);
}
}
//Create CoverflowItem and Set Data To It
private function createCover(num:uint, url:String):Sprite {
//Setup Data
var _data:Object = new Object();
_data.id=num;
//Create CoverflowItem
var cover:CoverflowItem=new CoverflowItem(_data);
//Listen for Click
cover.addEventListener(CoverflowItemEvent.COVERFLOWITEM_SELECTED, cover_Selected);
//Set Some Values
cover.name=num.toString();
cover.image=url;
cover.padding=padding;
cover.imageWidth=coverflowImageWidth;
cover.imageHeight=coverflowImageHeight;
cover.setReflection(reflectionAlpha, reflectionRatio, reflectionDistance, reflectionUpdateTime, reflectionDropoff);
//Put CoverflowItem in Sprite Container
var coverItem:Sprite = new Sprite();
cover.x=- coverflowImageWidth/2-padding;
cover.y=- coverflowImageHeight/2-padding;
coverItem.addChild(cover);
coverItem.name=num.toString();
return coverItem;
}
}
}
