prefetch: disable interval timer when we've pre-fetched everything.

Change-Id: I9d3b3819b3d9a960aa31f729686315e9e5d6d8e1
Reviewed-on: https://gerrit.libreoffice.org/c/online/+/84776
Reviewed-by: Andras Timar <andras.timar@collabora.com>
Tested-by: Andras Timar <andras.timar@collabora.com>

1 files changed, 8 insertions, 2 deletions

diff --git a/loleaflet/src/layer/tile/GridLayer.js b/loleaflet/src/layer/tile/GridLayer.js
index 55cb0263e..9999bbb48 100644
--- a/loleaflet/src/layer/tile/GridLayer.js
+++ b/loleaflet/src/layer/tile/GridLayer.js
@@ -1262,6 +1262,9 @@ L.GridLayer = L.Layer.extend({
 			var fragment = document.createDocumentFragment();
 			this._addTiles(finalQueue, fragment);
 			this._level.el.appendChild(fragment);
+		} else {
+			clearInterval(this._tilesPreFetcher);
+			this._tilesPreFetcher = undefined;
 		}
 	},
 
@@ -1269,8 +1272,10 @@ L.GridLayer = L.Layer.extend({
 		if (!this._map) {
 			return;
 		}
-		clearInterval(this._tilesPreFetcher);
-		clearTimeout(this._preFetchIdle);
+		if (this._tilesPreFetcher)
+			clearInterval(this._tilesPreFetcher);
+		if (this._preFetchIdle)
+			clearTimeout(this._preFetchIdle);
 		if (resetBorder) {
 			this._preFetchBorder = null;
 		}
@@ -1279,6 +1284,7 @@ L.GridLayer = L.Layer.extend({
 		this._preFetchPart = this._selectedPart;
 		this._preFetchIdle = setTimeout(L.bind(function () {
 			this._tilesPreFetcher = setInterval(L.bind(this._preFetchTiles, this), interval);
+			this._prefetchIdle = undefined;
 		}, this), idleTime);
 	}
 });