QAD::Map:

* add MapViewTileProviderBase - base class for tile server provider
 * migrate OSM to new class
 * add MapTiler provider
 * add offlineMode for MapView

libs/map/mapview_tile_provider_maptiler.h

@@ -0,0 +1,48 @@
+/*
+    QAD - Qt ADvanced
+
+    Ivan Pelipenko peri4ko@yandex.ru
+
+    This program is free software: you can redistribute it and/or modify
+    it under the terms of the GNU Lesser General Public License as published by
+    the Free Software Foundation, either version 3 of the License, or
+    (at your option) any later version.
+
+    This program is distributed in the hope that it will be useful,
+    but WITHOUT ANY WARRANTY; without even the implied warranty of
+    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+    GNU Lesser General Public License for more details.
+
+    You should have received a copy of the GNU Lesser General Public License
+    along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef mapview_tile_provider_maptiler_h
+#define mapview_tile_provider_maptiler_h
+
+#include "mapview_tile_provider_base.h"
+
+#include <QNetworkAccessManager>
+
+
+class QAD_MAP_EXPORT MapViewTileProvider_MapTiler: public MapViewTileProviderBase {
+	Q_OBJECT
+
+public:
+	MapViewTileProvider_MapTiler();
+	~MapViewTileProvider_MapTiler();
+
+	QString name() const override;
+	bool requestTile(OSM::TileIndex index) override;
+	QSize tileSize() override;
+
+protected:
+	void applyParameters() override;
+
+private:
+	QNetworkAccessManager * nam = nullptr;
+	QString url, key, tileset;
+};
+
+
+#endif