javascript – firefox-addon:获取屏幕边缘和网页之间的距离

好的,请考虑这张图片.

I develop an add-on firefox and I would :
  - the distance in red, between top of screen and top of `visible webpage`
  - the distance in red between left of screen and left of `visible webpage`
  - the distance in green

有什么意义?

我有一千个屏幕坐标(X,Y),我必须相对于网页计算坐标.

Example : 

Considering
  Screen size : 1200 * 800
  Webpage size : 400*300
  Red distance between left screen border and left webpage border  : 200
  Red distance between top screen border and top webpage border  : 300

So my coordinates screen => relative webpage becomes :
  ( 100, 100 ) => OUTSIDE WEBPAGE( ignored )
  ( 1100, 650 ) => OUTSIDE WEBPAGE ( ignored )
  ( 200, 300 ) => ( 0,0 )
  ( 250, 400 ) => ( 50, 100 )

我已经有了页面的宽度和高度

$(window).width()
$(window).heigth()

因此,如果我可以获得选项卡的左角坐标,我可以确定屏幕上选项卡的机器人角落.

我已经在这里提出了这个问题,但对于IE扩展.如果您需要更多细节.但我无法使用firefox的答案.

Get distance between screen edge and webpage

最佳答案 DOMWindows有mozInnerScreenX,pageXOffset和screenX

我用软件将屏幕移动到0,0我得到了这个:

aDOMWindow.mozInnerScreenX:8
   DOMWindow.screenX:0

如果我最大化窗口

aDOMWindow.mozInnerScreenX:-6
   DOMWindow.screenX:0

所以让我们使用screenX.

现在,如果您有一个gBrowser,那就是您在上面指出的“内部窗口”,我们看到boxObject有一个screenX.

所以它看起来只是做:

var aDOMWindow = Services.wm.getMostRecentWindow('navigator:browser'/*null*/);
console.log(aDOMWindow.mozInnerScreenX, aDOMWindow.screenX)

if (aDOMWindow.gBrowser) {
  var innerWin = aDOMWindow.gBrowser.boxObject;
  console.log(innerWin.screenX, innerWin.screenY);
}
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