o Don't recreate the map view on tilesource changes (issue #47)

@@ -28,6 +28,8 @@
 
 @property (nonatomic, assign) BOOL useSnapshotRenderer;
 
+@property (nonatomic, readonly) id <RMTileSource> tileSource;
+
 - (id)initWithFrame:(CGRect)frame mapView:(RMMapView *)aMapView forTileSource:(id <RMTileSource>)aTileSource;
 
 @end

@@ -21,12 +21,13 @@
 
 @implementation RMMapTiledLayerView
 {
-    RMMapView *mapView;
-    id <RMTileSource> tileSource;
+    RMMapView *_mapView;
+    id <RMTileSource> _tileSource;
 }
 
-@synthesize delegate;
-@synthesize useSnapshotRenderer;
+@synthesize delegate = _delegate;
+@synthesize useSnapshotRenderer = _useSnapshotRenderer;
+@synthesize tileSource = _tileSource;
 
 + (Class)layerClass
 {
@@ -43,8 +44,8 @@
     if (!(self = [super initWithFrame:frame]))
         return nil;
 
-    mapView = [aMapView retain];
-    tileSource = [aTileSource retain];
+    _mapView = [aMapView retain];
+    _tileSource = [aTileSource retain];
 
     self.userInteractionEnabled = YES;
     self.multipleTouchEnabled = YES;
@@ -53,8 +54,8 @@
     self.useSnapshotRenderer = NO;
 
     CATiledLayer *tiledLayer = [self tiledLayer];
-    size_t levelsOf2xMagnification = mapView.tileSourcesContainer.maxZoom;
-    if (mapView.adjustTilesForRetinaDisplay) levelsOf2xMagnification += 1;
+    size_t levelsOf2xMagnification = _mapView.tileSourcesContainer.maxZoom;
+    if (_mapView.adjustTilesForRetinaDisplay) levelsOf2xMagnification += 1;
     tiledLayer.levelsOfDetail = levelsOf2xMagnification;
     tiledLayer.levelsOfDetailBias = levelsOf2xMagnification;
 
@@ -85,10 +86,10 @@
 
 - (void)dealloc
 {
-    [tileSource cancelAllDownloads];
+    [_tileSource cancelAllDownloads];
     self.layer.contents = nil;
-    [tileSource release]; tileSource = nil;
-    [mapView release]; mapView = nil;
+    [_tileSource release]; _tileSource = nil;
+    [_mapView release]; _mapView = nil;
     [super dealloc];
 }
 
@@ -109,7 +110,7 @@
 
     if (self.useSnapshotRenderer)
     {
-        zoom = (short)ceilf(mapView.adjustedZoomForRetinaDisplay);
+        zoom = (short)ceilf(_mapView.adjustedZoomForRetinaDisplay);
         CGFloat rectSize = bounds.size.width / powf(2.0, (float)zoom);
 
         int x1 = floor(rect.origin.x / rectSize),
@@ -119,7 +120,7 @@
 
 //        NSLog(@"Tiles from x1:%d, y1:%d to x2:%d, y2:%d @ zoom %d", x1, y1, x2, y2, zoom);
 
-        if (zoom >= tileSource.minZoom && zoom <= tileSource.maxZoom)
+        if (zoom >= _tileSource.minZoom && zoom <= _tileSource.maxZoom)
         {
             UIGraphicsPushContext(context);
 
@@ -127,7 +128,7 @@
             {
                 for (int y=y1; y<=y2; ++y)
                 {
-                    UIImage *tileImage = [tileSource imageForTile:RMTileMake(x, y, zoom) inCache:[mapView tileCache]];
+                    UIImage *tileImage = [_tileSource imageForTile:RMTileMake(x, y, zoom) inCache:[_mapView tileCache]];
                     [tileImage drawInRect:CGRectMake(x * rectSize, y * rectSize, rectSize, rectSize)];
                 }
             }
@@ -146,12 +147,12 @@
 
         UIImage *tileImage = nil;
 
-        if (zoom >= tileSource.minZoom && zoom <= tileSource.maxZoom)
-            tileImage = [tileSource imageForTile:RMTileMake(x, y, zoom) inCache:[mapView tileCache]];
+        if (zoom >= _tileSource.minZoom && zoom <= _tileSource.maxZoom)
+            tileImage = [_tileSource imageForTile:RMTileMake(x, y, zoom) inCache:[_mapView tileCache]];
 
         if ( ! tileImage)
         {
-            if (mapView.missingTilesDepth == 0)
+            if (_mapView.missingTilesDepth == 0)
             {
                 tileImage = [RMTileImage errorTile];
             }
@@ -160,14 +161,14 @@
                 NSUInteger currentTileDepth = 1, currentZoom = zoom - currentTileDepth;
 
                 // tries to return lower zoom level tiles if a tile cannot be found
-                while ( !tileImage && currentZoom >= tileSource.minZoom && currentTileDepth <= mapView.missingTilesDepth)
+                while ( !tileImage && currentZoom >= _tileSource.minZoom && currentTileDepth <= _mapView.missingTilesDepth)
                 {
                     float nextX = x / powf(2.0, (float)currentTileDepth),
                           nextY = y / powf(2.0, (float)currentTileDepth);
                     float nextTileX = floor(nextX),
                           nextTileY = floor(nextY);
 
-                    tileImage = [tileSource imageForTile:RMTileMake((int)nextTileX, (int)nextTileY, currentZoom) inCache:[mapView tileCache]];
+                    tileImage = [_tileSource imageForTile:RMTileMake((int)nextTileX, (int)nextTileY, currentZoom) inCache:[_mapView tileCache]];
 
                     if (tileImage)
                     {
@@ -192,7 +193,7 @@
             }
         }
 
-        if (mapView.debugTiles)
+        if (_mapView.debugTiles)
         {
             UIGraphicsBeginImageContext(tileImage.size);
 
@@ -238,34 +239,34 @@
 
 - (void)handleSingleTap:(UIGestureRecognizer *)recognizer
 {
-    if ([delegate respondsToSelector:@selector(mapTiledLayerView:singleTapAtPoint:)])
-        [delegate mapTiledLayerView:self singleTapAtPoint:[recognizer locationInView:mapView]];
+    if ([_delegate respondsToSelector:@selector(mapTiledLayerView:singleTapAtPoint:)])
+        [_delegate mapTiledLayerView:self singleTapAtPoint:[recognizer locationInView:_mapView]];
 }
 
 - (void)handleTwoFingerSingleTap:(UIGestureRecognizer *)recognizer
 {
-    if ([delegate respondsToSelector:@selector(mapTiledLayerView:twoFingerSingleTapAtPoint:)])
-        [delegate mapTiledLayerView:self twoFingerSingleTapAtPoint:[recognizer locationInView:mapView]];
+    if ([_delegate respondsToSelector:@selector(mapTiledLayerView:twoFingerSingleTapAtPoint:)])
+        [_delegate mapTiledLayerView:self twoFingerSingleTapAtPoint:[recognizer locationInView:_mapView]];
 }
 
 - (void)handleLongPress:(UILongPressGestureRecognizer *)recognizer
 {
     if (recognizer.state != UIGestureRecognizerStateBegan) return;
 
-    if ([delegate respondsToSelector:@selector(mapTiledLayerView:longPressAtPoint:)])
-        [delegate mapTiledLayerView:self longPressAtPoint:[recognizer locationInView:mapView]];
+    if ([_delegate respondsToSelector:@selector(mapTiledLayerView:longPressAtPoint:)])
+        [_delegate mapTiledLayerView:self longPressAtPoint:[recognizer locationInView:_mapView]];
 }
 
 - (void)handleDoubleTap:(UIGestureRecognizer *)recognizer
 {
-    if ([delegate respondsToSelector:@selector(mapTiledLayerView:doubleTapAtPoint:)])
-        [delegate mapTiledLayerView:self doubleTapAtPoint:[recognizer locationInView:mapView]];
+    if ([_delegate respondsToSelector:@selector(mapTiledLayerView:doubleTapAtPoint:)])
+        [_delegate mapTiledLayerView:self doubleTapAtPoint:[recognizer locationInView:_mapView]];
 }
 
 - (void)handleTwoFingerDoubleTap:(UIGestureRecognizer *)recognizer
 {
-    if ([delegate respondsToSelector:@selector(mapTiledLayerView:twoFingerDoubleTapAtPoint:)])
-        [delegate mapTiledLayerView:self twoFingerDoubleTapAtPoint:[recognizer locationInView:mapView]];
+    if ([_delegate respondsToSelector:@selector(mapTiledLayerView:twoFingerDoubleTapAtPoint:)])
+        [_delegate mapTiledLayerView:self twoFingerDoubleTapAtPoint:[recognizer locationInView:_mapView]];
 }
 
 @end

@@ -1411,7 +1411,30 @@
     [self setZoom:[self zoom]]; // setZoom clamps zoom level to min/max limits
 
     // Recreate the map layer
-    [self createMapView];
+    NSUInteger tileSourcesContainerSize = [[_tileSourcesContainer tileSources] count];
+
+    if (tileSourcesContainerSize == 1)
+    {
+        [self createMapView];
+    }
+    else
+    {
+        int tileSideLength = [_tileSourcesContainer tileSideLength];
+        CGSize contentSize = CGSizeMake(tileSideLength, tileSideLength); // zoom level 1
+
+        RMMapTiledLayerView *tiledLayerView = [[RMMapTiledLayerView alloc] initWithFrame:CGRectMake(0.0, 0.0, contentSize.width, contentSize.height) mapView:self forTileSource:newTileSource];
+        tiledLayerView.delegate = self;
+
+        if (self.adjustTilesForRetinaDisplay && _screenScale > 1.0)
+            ((CATiledLayer *)tiledLayerView.layer).tileSize = CGSizeMake(tileSideLength * 2.0, tileSideLength * 2.0);
+        else
+            ((CATiledLayer *)tiledLayerView.layer).tileSize = CGSizeMake(tileSideLength, tileSideLength);
+
+        if (index >= [[_tileSourcesContainer tileSources] count])
+            [_tiledLayersSuperview addSubview:tiledLayerView];
+        else
+            [_tiledLayersSuperview insertSubview:tiledLayerView atIndex:index];
+    }
 
     [self setCenterProjectedPoint:centerPoint animated:NO];
 }
@@ -1429,8 +1452,20 @@
         _constrainMovement = NO;
     }
 
-    // Recreate the map layer
-    [self createMapView];
+    // Remove the map layer
+    RMMapTiledLayerView *tileSourceTiledLayerView = nil;
+
+    for (RMMapTiledLayerView *tiledLayerView in _tiledLayersSuperview.subviews)
+    {
+        if (tiledLayerView.tileSource == tileSource)
+        {
+            tileSourceTiledLayerView = tiledLayerView;
+            break;
+        }
+    }
+
+    tileSourceTiledLayerView.layer.contents = nil;
+    [tileSourceTiledLayerView removeFromSuperview]; [tileSourceTiledLayerView release]; tileSourceTiledLayerView = nil;
 
     [self setCenterProjectedPoint:centerPoint animated:NO];
 }
@@ -1448,20 +1483,29 @@
         _constrainMovement = NO;
     }
 
-    // Recreate the map layer
-    [self createMapView];
+    // Remove the map layer
+    RMMapTiledLayerView *tileSourceTiledLayerView = [_tiledLayersSuperview.subviews objectAtIndex:index];
+
+    tileSourceTiledLayerView.layer.contents = nil;
+    [tileSourceTiledLayerView removeFromSuperview]; [tileSourceTiledLayerView release]; tileSourceTiledLayerView = nil;
 
     [self setCenterProjectedPoint:centerPoint animated:NO];
 }
 
 - (void)moveTileSourceAtIndex:(NSUInteger)fromIndex toIndex:(NSUInteger)toIndex
 {
+    if (fromIndex == toIndex)
+        return;
+
+    if (fromIndex >= [[_tileSourcesContainer tileSources] count])
+        return;
+
     RMProjectedPoint centerPoint = [self centerProjectedPoint];
 
     [_tileSourcesContainer moveTileSourceAtIndex:fromIndex toIndex:toIndex];
 
-    // Recreate the map layer
-    [self createMapView];
+    // Move the map layer
+    [_tiledLayersSuperview exchangeSubviewAtIndex:fromIndex withSubviewAtIndex:toIndex];
 
     [self setCenterProjectedPoint:centerPoint animated:NO];
 }

@@ -17,6 +17,7 @@
 #import "RMAnnotation.h"
 #import "RMQuadTree.h"
 #import "RMCoordinateGridSource.h"
+#import "RMOpenCycleMapSource.h"
 
 @implementation MainViewController
 {
@@ -170,16 +171,21 @@
 
 //    double delayInSeconds = 5.0;
 //    dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, delayInSeconds * NSEC_PER_SEC);
-//    dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
-//        [mapView addTileSource:[[[RMOpenSeaMapLayer alloc] init] autorelease]];
+//    dispatch_after(popTime, dispatch_get_main_queue(), ^(void) {
+//        [mapView addTileSource:[[[RMCoordinateGridSource alloc] init] autorelease]];
 //
 //        dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, delayInSeconds * NSEC_PER_SEC);
-//        dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
+//        dispatch_after(popTime, dispatch_get_main_queue(), ^(void) {
 //            [mapView setHidden:YES forTileSourceAtIndex:1];
 //
 //            dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, delayInSeconds * NSEC_PER_SEC);
-//            dispatch_after(popTime, dispatch_get_main_queue(), ^(void){
+//            dispatch_after(popTime, dispatch_get_main_queue(), ^(void) {
 //                [mapView setHidden:NO forTileSourceAtIndex:1];
+//
+//                dispatch_time_t popTime = dispatch_time(DISPATCH_TIME_NOW, delayInSeconds * NSEC_PER_SEC);
+//                dispatch_after(popTime, dispatch_get_main_queue(), ^(void) {
+//                    [mapView removeTileSourceAtIndex:1];
+//                });
 //            });
 //        });
 //    });