On Thursday, 16 May 2013 17:27:21 UTC+2, Matthew Gertner wrote: > I have a toolbar button that displays a XUL panel when pressed. The panel > contains an iframe into which an HTML page is loaded. To avoid "flicker", I'd > like to defer display of the panel until the HTML page has finished loading > (DOMContentLoaded). > > > > I tried setting the panel's hidden property to true in the popupshowing > handler and then setting it back to true when the iframe has finished > loading. The DOMContentLoaded handler for the iframe is called, but the panel > remains invisible even after setting hidden back to false. The state of the > panel is 'closed' at this point. > > > > It seems like the panel is automatically being closed when its hidden > property is set to true. (The same happens when I set style.display to 'none' > or collapsed to true). I nosed around the source code a bit but ended it > quickly in the bowels of nsBoxObject.cpp. Before I start debugging the box > object code, does anyone have any insights into why setting the hidden > property of the panel's XUL element to true causes it to be closed (and thus > remain invisible even when hidden is set back to false)?
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