From 579c2e5e629898b23d48edfecd31ac3c0189d459 Mon Sep 17 00:00:00 2001
From: itanka9 <itano@yandex.ru>
Date: Thu, 11 Mar 2021 08:30:55 +0300
Subject: [PATCH] Revert "Fix preview flickering on iOS devices (#542)" (#545)

This reverts commit dcfdfc27f2ab88fda5a504db84857ab589ea8eff.
---
 src/DGCustomization/src/DGMobileImprove.js | 34 ++++++++++++----------
 1 file changed, 18 insertions(+), 16 deletions(-)

diff --git a/src/DGCustomization/src/DGMobileImprove.js b/src/DGCustomization/src/DGMobileImprove.js
index 01cc7a605..c83cac601 100644
--- a/src/DGCustomization/src/DGMobileImprove.js
+++ b/src/DGCustomization/src/DGMobileImprove.js
@@ -368,7 +368,7 @@ L.MobileTileLayer = L.TileLayer.extend({
         var needPreview = this._needPreviewTile(wrapCoords);
 
         var url = needPreview ? this._previewUrl : this._url;
-        var tile = this.createTile(wrapCoords, L.bind(needPreview ? this._previewReady : this._tileReady, this, coords), url);
+        var tile = this.createTile(wrapCoords, L.bind(this._tileReady, this, coords), url);
 
         this._initTile(tile);
 
@@ -391,21 +391,6 @@ L.MobileTileLayer = L.TileLayer.extend({
         });
     },
 
-    _previewReady: function(coords, err, tile) {
-        if (!this._map) { return; }
-
-        var key = this._tileCoordsToKey(coords);
-
-        tile = this._tiles[key];
-        if (!tile) { return; }
-
-
-        tile.el.onload = L.bind(this._tileReady, this, coords, err, tile);
-        tile.el.onerror = L.bind(this._tileReady, this, coords, err, tile);
-        tile.el.src = this.getTileUrl(coords, this._url);
-    },
-
-
     /**
      * Убран fadeAnimated и класс leaflet-tile-loaded
      */
@@ -427,6 +412,23 @@ L.MobileTileLayer = L.TileLayer.extend({
         tile = this._tiles[key];
         if (!tile) { return; }
 
+        // Если у тайла уже есть оригинальная (не пожатая) картинка,
+        // то заменим превью на нее
+        if (tile.originalEl && tile.el.parentNode) {
+            tile.el.parentNode.replaceChild(tile.originalEl, tile.el);
+            tile.el = tile.originalEl;
+
+            tile.originalEl = null;
+            tile.preview = false;
+
+        // Если у тайла есть только превью, то добавим его на карту
+        // И начнем грузить оригинальный
+        } else if (tile.preview) {
+            tile.originalEl = this.createTile(this._wrapCoords(coords), L.bind(this._tileReady, this, coords), this._url);
+            this._initTile(tile.originalEl);
+            L.DomUtil.setPosition(tile.originalEl, this._getTilePos(coords));
+        }
+
         tile.loaded = +new Date();
         tile.active = true;
         this._pruneTiles();