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Add a function to pump a generator until it yields false, allowing other events to be processed in between. This is useful because we can then call

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yield true;

in place of Zotero.wait() to allow UI events to be processed without exiting the function, thus avoiding the hassle of setting up a large number of callbacks.

This is still painful compared to Zotero.wait(), since the yield has to be present in the generator passed to Zotero.pumpGenerator() and not a child function. However, it's less painful than using a bunch of nested setTimeout() calls.
This commit is contained in:
Simon Kornblith 2011-09-21 00:32:25 +00:00
parent 21aff6f467
commit 4607239fa9
1 changed files with 20 additions and 0 deletions
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20
chrome/content/zotero/xpcom/zotero.js
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@ -1509,6 +1509,26 @@ if(appInfo.platformVersion[0] >= 2) {
window.zoteroLastRepaint = now;
};
/**
* Pumps a generator until it yields false. See schema.js for an example.
*/
this.pumpGenerator = function(generator) {
_waiting++;
var timer = Components.classes["@mozilla.org/timer;1"].
createInstance(Components.interfaces.nsITimer);
var timerCallback = {"notify":function() {
if(!generator.next()) {
timer.cancel();
_runningTimers.splice(_runningTimers.indexOf(timer), 1);
_waiting--;
}
}}
timer.initWithCallback(timerCallback, ms, Components.interfaces.nsITimer.TYPE_REPEATING_SLACK);
// add timer to global scope so that it doesn't get garbage collected before it completes
_runningTimers.push(timer);
}
/**
* Emulates the behavior of window.setTimeout, but ensures that callbacks do not get called
* during Zotero.wait()