Expose things from provider for region pre-cache functionality

src/mahomaps/MahoMapsApp.java

@@ -104,7 +104,7 @@ protected void destroyApp(boolean arg0) {
 		if (thread != null)
 			thread.interrupt();
 		if (tiles != null)
-			tiles.Stop();
+			tiles.Stop(false);
 		if (canvas != null)
 			canvas.dispose();
 	}
@@ -120,7 +120,7 @@ public void run() {
 			// just in case
 		}
 		try {
-			tiles = new TilesProvider(Settings.GetLangString()); // wrong lang in settings
+			tiles = new TilesProvider(Settings.GetLangString(), thread); // wrong lang in settings
 		} catch (RuntimeException e) {
 			Form f = new Form(MahoMapsApp.text[88],
 					new Item[] { new StringItem(MahoMapsApp.text[91], MahoMapsApp.text[92]) });

src/mahomaps/map/TilesProvider.java

@@ -54,23 +54,26 @@ public class TilesProvider implements Runnable {
 
 	private Thread networkTh;
 	private Thread cacheTh;
+	private Thread accessTh;
 
 	public static final String[] tilesUrls = new String[] {
 			// scheme
 			"https://core-renderer-tiles.maps.yandex.net/tiles?l=map&lang=",
 			// sat
 			"https://core-sat.maps.yandex.net/tiles?l=sat&lang=",
 			// hybrid
-			"http://nnp.nnchan.ru/mergedtile.php?lang="
-	};
+			"http://nnp.nnchan.ru/mergedtile.php?lang=" };
 
-	public TilesProvider(String lang) {
+	public TilesProvider(String lang, Thread accesser) {
 		if (lang == null)
 			throw new NullPointerException("Language must be non-null!");
 		this.lang = lang;
+		accessTh = accesser;
 	}
 
 	public void Start() {
+		if (accessTh == null)
+			throw new IllegalStateException("Tiles provider must be bound to a thread!");
 		if (networkTh != null || cacheTh != null)
 			throw new IllegalStateException("Can't start already running tiles provider!");
 		networkTh = new Thread(this, "Tiles downloader");
@@ -79,12 +82,24 @@ public void Start() {
 		cacheTh.start();
 	}
 
-	public void Stop() {
-		if (networkTh != null)
+	public void Stop(boolean blocking) {
+		if (networkTh != null) {
 			networkTh.interrupt();
+			try {
+				if (blocking)
+					networkTh.join();
+			} catch (InterruptedException e) {
+			}
+		}
 		networkTh = null;
-		if (cacheTh != null)
+		if (cacheTh != null) {
 			cacheTh.interrupt();
+			try {
+				if (blocking)
+					cacheTh.join();
+			} catch (InterruptedException e) {
+			}
+		}
 		cacheTh = null;
 	}
 
@@ -466,7 +481,7 @@ private Image tryLoadFromRMS(TileId id) {
 	 * Выполняет операции, необходимые перед очередной отрисовкой.
 	 */
 	public void BeginMapPaint() {
-		if (Thread.currentThread() != MahoMapsApp.thread)
+		if (Thread.currentThread() != accessTh)
 			throw new IllegalThreadStateException(INVALID_THREAD_ERR);
 		if (paintState)
 			throw new IllegalStateException("Paint is already in progress.");
@@ -483,11 +498,7 @@ public void BeginMapPaint() {
 	 * Выполняет операции, необходимые после очередной отрисовки.
 	 */
 	public void EndMapPaint(MapState ms) {
-		if (Thread.currentThread() != MahoMapsApp.thread)
-			throw new IllegalThreadStateException(INVALID_THREAD_ERR);
-		if (!paintState)
-			throw new IllegalStateException("Paint was not performed.");
-		paintState = false;
+		exitPaintState();
 
 		final int reqZoom = ms.zoom;
 
@@ -517,6 +528,36 @@ public void EndMapPaint(MapState ms) {
 			cacheGate.Reset();
 	}
 
+	public void EndMapPaintThenDiscardAll() {
+		exitPaintState();
+
+		synchronized (cache) {
+			for (int i = cache.size() - 1; i > -1; i--) {
+				TileCache t = (TileCache) cache.elementAt(i);
+				synchronized (t) {
+					switch (t.state) {
+					case TileCache.STATE_CACHE_LOADING:
+					case TileCache.STATE_SERVER_LOADING:
+						// we can't remove this tile
+						continue;
+					default:
+						t.state = TileCache.STATE_UNLOADED;
+						cache.removeElementAt(i);
+						break;
+					}
+				}
+			}
+		}
+	}
+
+	private void exitPaintState() {
+		if (Thread.currentThread() != accessTh)
+			throw new IllegalThreadStateException(INVALID_THREAD_ERR);
+		if (!paintState)
+			throw new IllegalStateException("Paint was not performed.");
+		paintState = false;
+	}
+
 	/**
 	 * Возвращает объект кэша плитки для отрисовки.
 	 *
@@ -525,10 +566,10 @@ public void EndMapPaint(MapState ms) {
 	 *         null</b> если координаты плитки не находятся в пределах карты
 	 *         (например, Y отрицательный).
 	 */
-	public TileCache getTile(TileId tileId) {
+	public TileCache GetTile(TileId tileId) {
 		if (!paintState)
 			throw new IllegalStateException("Paint was not performing now, can't get tile!");
-		if (Thread.currentThread() != MahoMapsApp.thread)
+		if (Thread.currentThread() != accessTh)
 			throw new IllegalThreadStateException(INVALID_THREAD_ERR);
 
 		int max = 0x1 << tileId.zoom;
@@ -573,8 +614,7 @@ public TileCache getTile(TileId tileId) {
 	}
 
 	private String getUrl(TileId tileId) {
-		String url = tilesUrls[tileId.map] + lang + "&x=" + tileId.x + "&y=" + tileId.y
-				+ "&z=" + tileId.zoom;
+		String url = tilesUrls[tileId.map] + lang + "&x=" + tileId.x + "&y=" + tileId.y + "&z=" + tileId.zoom;
 		if (Settings.proxyTiles && url.startsWith("https")) {
 			return Settings.proxyServer + YmapsApiBase.EncodeUrl(url);
 		}

src/mahomaps/screens/MapCanvas.java

@@ -147,7 +147,7 @@ private void drawMap(Graphics g, int w, int h) {
 			int x = xo - trX * 256;
 			int xi = tx - trX;
 			while (x < w / 2) {
-				TileCache tile = tiles.getTile(new TileId(xi, yi, ms.zoom, Settings.map));
+				TileCache tile = tiles.GetTile(new TileId(xi, yi, ms.zoom, Settings.map));
 				if (tile != null)
 					tile.paint(g, x, y);
 				x += 256;