Event.ADDED_TO_STAGE 什么时候来电?
when Event.ADDED_TO_STAGE is call?
我有这个代码:
addEventListener(Event.ADDED_TO_STAGE, onAddedToStage);
此事件何时调用?我正在研究 example project of StageVideo 但这并不容易。我正在开发 Flash 专业版。
如其名称所示,addedToStage
事件是
Dispatched when a display object is added to the on stage display list, either directly or through the addition of a sub tree in which the display object is contained. The following methods trigger this event: DisplayObjectContainer.addChild(), DisplayObjectContainer.addChildAt().
希望能帮到你。
每当调用 addChild()
或 addChildAt()
时,都会调用 Event.ADDED_TO_STAGE
。
为了确保阶段和父对象在被添加到阶段的对象中可用,您在对象的构造函数中添加 Event.ADDED_TO_STAGE
的侦听器,然后将该对象添加到阶段,它的 Event.ADDED_TO_STAGE
侦听器将被触发,并且该对象的阶段和父对象将可用。
示例:
package {
import flash.display.Sprite;
public class Main extends Sprite {
public function Main() {
var textField:ChildTextField = new ChildTextField();
textField.text = "Hello Whosebug";
addChild(textField);
}
}
}
import flash.events.Event;
import flash.text.TextField;
class ChildTextField extends TextField {
public function ChildTextField() {
trace("(Stage (Before addChild):" + stage);
trace("ChildTextField Parent (Before addChild): " + this.parent);
addEventListener(Event.ADDED_TO_STAGE, initWhenAddedToStage);
}
function initWhenAddedToStage(e:Event):void {
trace("Stage (After addChild): " + stage);
trace("ChildTextField (After addChild): " + this.parent);
}
}
输出:
[trace] (Stage (Before addChild):null
[trace] ChildTextField Parent (Before addChild): null
[trace] Stage (After addChild): [object Stage]
[trace] ChildTextField (After addChild): [object Main]
我有这个代码:
addEventListener(Event.ADDED_TO_STAGE, onAddedToStage);
此事件何时调用?我正在研究 example project of StageVideo 但这并不容易。我正在开发 Flash 专业版。
如其名称所示,addedToStage
事件是
Dispatched when a display object is added to the on stage display list, either directly or through the addition of a sub tree in which the display object is contained. The following methods trigger this event: DisplayObjectContainer.addChild(), DisplayObjectContainer.addChildAt().
希望能帮到你。
addChild()
或 addChildAt()
时,都会调用 Event.ADDED_TO_STAGE
。
为了确保阶段和父对象在被添加到阶段的对象中可用,您在对象的构造函数中添加 Event.ADDED_TO_STAGE
的侦听器,然后将该对象添加到阶段,它的 Event.ADDED_TO_STAGE
侦听器将被触发,并且该对象的阶段和父对象将可用。
示例:
package {
import flash.display.Sprite;
public class Main extends Sprite {
public function Main() {
var textField:ChildTextField = new ChildTextField();
textField.text = "Hello Whosebug";
addChild(textField);
}
}
}
import flash.events.Event;
import flash.text.TextField;
class ChildTextField extends TextField {
public function ChildTextField() {
trace("(Stage (Before addChild):" + stage);
trace("ChildTextField Parent (Before addChild): " + this.parent);
addEventListener(Event.ADDED_TO_STAGE, initWhenAddedToStage);
}
function initWhenAddedToStage(e:Event):void {
trace("Stage (After addChild): " + stage);
trace("ChildTextField (After addChild): " + this.parent);
}
}
输出:
[trace] (Stage (Before addChild):null
[trace] ChildTextField Parent (Before addChild): null
[trace] Stage (After addChild): [object Stage]
[trace] ChildTextField (After addChild): [object Main]