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.cpp

@@ -0,0 +1,65 @@
+#include "mapview_tile_provider_maptiler.h"
+
+#include <QNetworkReply>
+#include <QNetworkRequest>
+#include <QTimer>
+#include <piqt.h>
+
+
+MapViewTileProvider_MapTiler::MapViewTileProvider_MapTiler() {
+	nam = new QNetworkAccessManager();
+	PIValueTree p;
+	p.addChild(PIValueTree("url", "https://api.maptiler.com/maps"));
+	p.addChild(PIValueTree("key", ""));
+	p.addChild(PIValueTree("tileset", ""));
+	initParameters(p);
+}
+
+
+MapViewTileProvider_MapTiler::~MapViewTileProvider_MapTiler() {
+	piDeleteSafety(nam);
+}
+
+
+QString MapViewTileProvider_MapTiler::name() const {
+	static QString ret = "MapTiler";
+	return ret;
+}
+
+
+bool MapViewTileProvider_MapTiler::requestTile(OSM::TileIndex index) {
+	QNetworkRequest req(url + QString("/%1/%2/%3/%4.jpg?key=%5").arg(tileset).arg(index.z).arg(index.x).arg(index.y).arg(key));
+	req.setHeader(QNetworkRequest::UserAgentHeader, "Qt/5");
+	auto * r = nam->get(req);
+	if (!r) return false;
+	// qDebug() << "Reqst:" << index.z << index.x << index.y;
+	connect(r, &QNetworkReply::finished, this, [this, r, index]() {
+		r->deleteLater();
+		QPixmap tim;
+		if (r->error() != QNetworkReply::NoError) {
+			qDebug() << "Retry:" << index.z << index.x << index.y << r->error();
+			QTimer::singleShot(500, this, [this, index] { requestTile(index); });
+			return;
+		} else {
+			QByteArray data = r->readAll();
+			if (!data.isEmpty()) {
+				tim.loadFromData(data, "jpg");
+				// qDebug() << "Ready:" << index.z << index.x << index.y;
+			}
+		}
+		tileReady(index, tim);
+	});
+	return true;
+}
+
+
+QSize MapViewTileProvider_MapTiler::tileSize() {
+	return {512, 512};
+}
+
+
+void MapViewTileProvider_MapTiler::applyParameters() {
+	url     = PI2QString(getParameters().childValue("url").toString());
+	key     = PI2QString(getParameters().childValue("key").toString());
+	tileset = PI2QString(getParameters().childValue("tileset").toString());
+}