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Change completionCallback with 'tile-loaded' event to support original scenario of async completion notification with additional guarding flags.

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This commit is contained in:
Aiosa 2023-01-31 08:05:02 +01:00
parent 81d86570da
commit 55e7d2439a
1 changed files with 11 additions and 9 deletions
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20
src/tiledimage.js
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@ -1655,17 +1655,23 @@ $.extend($.TiledImage.prototype, $.EventSource.prototype, /** @lends OpenSeadrag
* @param {XMLHttpRequest|undefined} tileRequest
*/
_setTileLoaded: function(tile, data, cutoff, tileRequest) {
var stopper = 1,
cached = false,
var increment = 0,
completed = false,
eventFinished = false,
_this = this;
function getCompletionCallback() {
if (eventFinished) {
$.console.error("Event 'tile-loaded' argument getCompletionCallback must not be called asynchronously.");
}
increment++;
return completionCallback;
}
function completionCallback() {
stopper--;
if (stopper >= 0) {
increment--;
if (increment === 0 && !completed) {
completed = true;
tile.loading = false;
tile.loaded = true;
tile.hasTransparency = _this.source.hasTransparency(
@ -1678,13 +1684,8 @@ $.extend($.TiledImage.prototype, $.EventSource.prototype, /** @lends OpenSeadrag
cutoff: cutoff,
tiledImage: _this
});
cached = true;
}
_this._needsDraw = true;
} else if (tile.context2D && cached) {
$.console.error("The tile has been cached, yet tile.context2D was set afterwards." +
" The cache is orphaned now. To avoid this, increase the priority of 'tile-loaded' event " +
"attaching context2D property.");
}
}
@ -1717,6 +1718,7 @@ $.extend($.TiledImage.prototype, $.EventSource.prototype, /** @lends OpenSeadrag
getCompletionCallback: getCompletionCallback
});
// In case the completion callback is never called, we at least force it once.
eventFinished = true;
getCompletionCallback()();
},