8.14.创建视频播放进度条
8.14.1. 问题
我需要创建一个控制条，使用户能够在视频播放时使用进度条。
8.14.2. 解决办法
创建一个可以拖动的Sprite 对象，并且监听任何它发出的DragEvent 事件。在DragEvent 时间处理中，在Video 对象的视频流，NetStream 设置向前或向后的搜索总数，
8.14.3. 讨论
您可以使用任何可拖动的显示对象在播放的视频中设定新的位置。在这个例子中，NetStream的seek 方法从视频开头起指定秒数的点开始播放。
用户打算搜索视频中制定的秒数时，用拖动Sprite 对象在时间线区域的宽度来分配位置和在视频中的长度。NetStream 会照顾寻找适当的帧，从这一点开始重现播放视频流。
我需要创建一个控制条，使用户能够在视频播放时使用进度条。
8.14.2. 解决办法
创建一个可以拖动的Sprite 对象，并且监听任何它发出的DragEvent 事件。在DragEvent 时间处理中，在Video 对象的视频流，NetStream 设置向前或向后的搜索总数，
8.14.3. 讨论
您可以使用任何可拖动的显示对象在播放的视频中设定新的位置。在这个例子中，NetStream的seek 方法从视频开头起指定秒数的点开始播放。
+展开
-ActionScript
ns.seek((playhead.x/timeline.width) * length);
用户打算搜索视频中制定的秒数时，用拖动Sprite 对象在时间线区域的宽度来分配位置和在视频中的长度。NetStream 会照顾寻找适当的帧，从这一点开始重现播放视频流。
+展开
-ActionScript
import flash.display.Sprite;
import flash.events.MouseEvent;
import flash.events.NetStatusEvent;
import flash.media.Video;
import flash.net.NetConnection;
import flash.net.NetStream;
import mx.core.UIComponent;
public class Scrubber extends UIComponent
{
private var playhead:Sprite;
private var timeline:Sprite;
private var ns:NetStream;
private var nc:NetConnection;
private var obj:Object = {};
private var length:int;
private var vid:Video;
public function Scrubber () {
super();
playhead = new Sprite();
addChild(playhead);
playhead.graphics.beginFill(0x0000ff, 1);
playhead.graphics.drawCircle(0, 0, 5);
playhead.graphics.endFill();
playhead.addEventListener(MouseEvent.MOUSE_DOWN,
startSeek);
timeline = new Sprite();
timeline.graphics.beginFill(0xcccccc, 1);
timeline.graphics.drawRect(0, 0, 200, 10);
timeline.graphics.endFill();
addChild(timeline);
timeline.addChild(playhead);
playhead.y = 4;
vid = new Video();
addChild(vid);
vid.y = 100;
nc = new NetConnection();
nc.addEventListener(NetStatusEvent.NET_STATUS,
netStatus);
nc.connect(null);
}
private function netStatus(event:NetStatusEvent):void {
obj.onMetaData = onMetaData;
ns = new NetStream(nc);
ns.client = obj;
vid.attachNetStream(ns);
ns.play("http://localhost:3001/test.flv");
}
private function onMetaData(obj:Object):void {
length = obj.duration;
trace(length);
}
private function startSeek(mouseEvent:MouseEvent):void {
playhead.startDrag(false, timeline.getBounds(this));
addEventListener(MouseEvent.MOUSE_MOVE, seek);
playhead.addEventListener(MouseEvent.ROLL_OUT, endSeek);
playhead.addEventListener(MouseEvent.MOUSE_UP, endSeek);
}
private function seek(mouseEvent:MouseEvent):void {
ns.seek((playhead.x/timeline.width) * length);
}
private function endSeek(mouseEvent:MouseEvent):void {
removeEventListener(MouseEvent.MOUSE_MOVE, seek);
playhead.stopDrag();
}
import flash.events.MouseEvent;
import flash.events.NetStatusEvent;
import flash.media.Video;
import flash.net.NetConnection;
import flash.net.NetStream;
import mx.core.UIComponent;
public class Scrubber extends UIComponent
{
private var playhead:Sprite;
private var timeline:Sprite;
private var ns:NetStream;
private var nc:NetConnection;
private var obj:Object = {};
private var length:int;
private var vid:Video;
public function Scrubber () {
super();
playhead = new Sprite();
addChild(playhead);
playhead.graphics.beginFill(0x0000ff, 1);
playhead.graphics.drawCircle(0, 0, 5);
playhead.graphics.endFill();
playhead.addEventListener(MouseEvent.MOUSE_DOWN,
startSeek);
timeline = new Sprite();
timeline.graphics.beginFill(0xcccccc, 1);
timeline.graphics.drawRect(0, 0, 200, 10);
timeline.graphics.endFill();
addChild(timeline);
timeline.addChild(playhead);
playhead.y = 4;
vid = new Video();
addChild(vid);
vid.y = 100;
nc = new NetConnection();
nc.addEventListener(NetStatusEvent.NET_STATUS,
netStatus);
nc.connect(null);
}
private function netStatus(event:NetStatusEvent):void {
obj.onMetaData = onMetaData;
ns = new NetStream(nc);
ns.client = obj;
vid.attachNetStream(ns);
ns.play("http://localhost:3001/test.flv");
}
private function onMetaData(obj:Object):void {
length = obj.duration;
trace(length);
}
private function startSeek(mouseEvent:MouseEvent):void {
playhead.startDrag(false, timeline.getBounds(this));
addEventListener(MouseEvent.MOUSE_MOVE, seek);
playhead.addEventListener(MouseEvent.ROLL_OUT, endSeek);
playhead.addEventListener(MouseEvent.MOUSE_UP, endSeek);
}
private function seek(mouseEvent:MouseEvent):void {
ns.seek((playhead.x/timeline.width) * length);
}
private function endSeek(mouseEvent:MouseEvent):void {
removeEventListener(MouseEvent.MOUSE_MOVE, seek);
playhead.stopDrag();
}
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