目前,我正在尝试添加将演示文稿的所有幻灯片捕获到图像并将其保存到磁盘的功能。它现在可以在捕获第一个页面的地方工作,然后我希望在加载第二个页面以捕获该页面时触发异步事件,依此类推。这是我添加事件监听器的地方,但我不确定是否应该使用stage
或this
:
import flash.events.Event;
private var jpgEncoder:JPGEncoder;
// ...
private function init():void{
// ...
// Add async event to capture second page after loading
stage.loaderInfo.addEventListener(Event.COMPLETE,onLoadComplete);
// ...
}
private function onPrintButtonClicked():void {
// screen capture code
jpgEncoder = new JPGEncoder(90);
// Page 1 capture
bitmapData1 = new BitmapData(stage.width, stage.height);
bitmapData1.draw(stage, new Matrix());
// move to next page
var curPage:Page = PresentationModel.getInstance().getCurrentPage();
if (curPage != null) {
LOGGER.debug("Go to next page. Current page [{0}]", [curPage.id]);
pageCount++;
dispatchEvent(new GoToNextPageCommand(curPage.id));
} else {
LOGGER.debug("Go to next page. CanNOT find current page.");
}
}
private function onLoadComplete(e:Event)
{
// Get page 2 capture
bitmapData2 = new BitmapData(stage.width, stage.height);
bitmapData2.draw(stage, new Matrix());
// Copy two pages to one bitmap
var rect1:Rectangle = new Rectangle(0, 0, stage.width, stage.height);
var pt1:Point = new Point(0, 0);
bitmapData3 = new BitmapData(stage.width, stage.height * 2);
bitmapData3.copyPixels(bitmapData1, rect1, pt1)
var rect2:Rectangle = new Rectangle(0, 0, stage.width, stage.height);
var pt2:Point = new Point(0, stage.height);
bitmapData3.copyPixels(bitmapData2, rect2, pt2)
// Convert to image
var img:ByteArray = jpgEncoder.encode(bitmapData3);
var file:FileReference = new FileReference();
file.save(img, "capture1.jpg");
}
有没有人知道为什么永远不会调用OnLoadComplete
函数?仅供参考,这里是完整的源代码:https://github.com/john1726/bigbluebutton/blob/master/bigbluebutton-client/src/org/bigbluebutton/main/views/MainToolbar.mxml
TIA
答案 0 :(得分:0)
请注意,我发现init()
方法中的阶段仍然为空,因此抛出异常:
stage.loaderInfo.addEventListener(Event.COMPLETE,onLoadComplete);
此外,在解决该阶段错误后,我发现我使用此工具收到此错误:https://github.com/capilkey/Vizzy-Flash-Tracer
错误#2176:某些操作(例如显示弹出窗口的操作)只能在用户交互时调用,例如通过鼠标单击或按下按钮。
所以解决方案要么重新启动UI,要么按下按钮来准备文件,按下第二个按钮来实际保存图像或设置鼠标和mousedown事件来调用不同的函数:
s:Button mouseDown="prepare_PDF()" mouseUp="save_PDF()"
来源:Flex's FileReference.save() can only be called in a user event handler -- how can I get around this?
谢谢!