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_downloader_p.h

@@ -0,0 +1,74 @@
+/*
+    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_downloader_h
+#define mapview_tile_downloader_h
+
+#include "mapview_tile_provider_base.h"
+#include "osm_types_p.h"
+
+#include <QMutex>
+#include <QNetworkAccessManager>
+#include <QNetworkReply>
+#include <QNetworkRequest>
+#include <QPixmap>
+#include <QQueue>
+#include <QThread>
+#include <QWaitCondition>
+
+class MapView;
+
+class MapViewTileDownloader: public QThread {
+	Q_OBJECT
+
+	friend class MapViewTileCache;
+
+public:
+	explicit MapViewTileDownloader(MapView * p);
+	~MapViewTileDownloader();
+
+	bool queueTile(OSM::TileIndex index, bool force = false);
+	void queueTiles(QList<OSM::TileIndex> indeces);
+	void clearQueue();
+
+	void setTileProvider(MapViewTileProviderBase * p);
+	MapViewTileProviderBase * tileProvider() const { return provider; }
+
+private:
+	void run() override;
+	void requestTile(OSM::TileIndex index);
+
+	MapView * parent;
+	MapViewTileProviderBase * provider = nullptr;
+	QWaitCondition cond;
+	QMutex cond_mutex;
+	QQueue<OSM::TileIndex> queue;
+	QSet<quint64> in_progress;
+
+public slots:
+
+private slots:
+	void tileReady(OSM::TileIndex index, QPixmap pm);
+
+signals:
+	void tileDone();
+};
+
+
+#endif