Fixes for issues #198, #201, #202, #203

src/eventhandler.js

@@ -36,7 +36,7 @@
 
 /**
  * For use by classes which want to support custom, non-browser events.
- * TODO: This is an aweful name!  This thing represents an "event source",
+ * TODO: This is an awful name!  This thing represents an "event source",
  *       not an "event handler".  PLEASE change the to EventSource. Also please
  *       change 'addHandler', 'removeHandler' and 'raiseEvent' to 'bind',
  *       'unbind', and 'trigger' respectively.  Finally add a method 'one' which
@@ -55,14 +55,15 @@ $.EventHandler.prototype = {
      * @function
      * @param {String} eventName - Name of event to register.
      * @param {Function} handler - Function to call when event is triggered.
+     * @param {Object} optional userData - Arbitrary object to be passed to the handler.
      */
-    addHandler: function( eventName, handler ) {
+    addHandler: function ( eventName, handler, userData ) {
         var events = this.events[ eventName ];
         if ( !events ) {
             this.events[ eventName ] = events = [];
         }
         if ( handler && $.isFunction( handler ) ) {
-            events[ events.length ] = handler;
+            events[ events.length ] = { handler: handler, userData: userData || null };
         }
     },
 
@@ -81,7 +82,7 @@ $.EventHandler.prototype = {
         }
         if ( $.isArray( events ) ) {
             for ( i = 0; i < events.length; i++ ) {
-                if( events[ i ] !== handler ){
+                if ( events[i].handler !== handler ) {
                     handlers.push( events[ i ] );
                 }
             }
@@ -124,7 +125,8 @@ $.EventHandler.prototype = {
             length = events.length;
             for ( i = 0; i < length; i++ ) {
                 if (events[ i ]) {
-                    events[ i ]( source, args );
+                    args.userData = events[ i ].userData;
+                    events[ i ].handler( source, args );
                 }
             }
         };

src/legacytilesource.js

@@ -71,8 +71,16 @@ $.LegacyTileSource = function( levels ) {
 
     //clean up the levels to make sure we support all formats
     options.levels = filterFiles( options.levels );
+
+    if ( options.levels.length > 0 ) {
         width = options.levels[ options.levels.length - 1 ].width;
         height = options.levels[ options.levels.length - 1 ].height;
+    }
+    else {
+        width = 0;
+        height = 0;
+        $.console.error( "No supported image formats found" );
+    }
 
     $.extend( true, options, {
         width: width,
@@ -80,7 +88,7 @@ $.LegacyTileSource = function( levels ) {
         tileSize: Math.max( height, width ),
         tileOverlap: 0,
         minLevel: 0,
-        maxLevel:    options.levels.length - 1
+        maxLevel: options.levels.length > 0 ? options.levels.length - 1 : 0
     } );
 
     $.TileSource.apply( this, [ options ] );
@@ -141,7 +149,7 @@ $.extend( $.LegacyTileSource.prototype, $.TileSource.prototype, {
      */
     getLevelScale: function ( level ) {
         var levelScale = NaN;
-        if (  level >= this.minLevel && level <= this.maxLevel ){
+        if ( this.levels.length > 0 && level >= this.minLevel && level <= this.maxLevel ) {
             levelScale =
                 this.levels[ level ].width /
                 this.levels[ this.maxLevel ].width;
@@ -188,7 +196,7 @@ $.extend( $.LegacyTileSource.prototype, $.TileSource.prototype, {
      */
     getTileUrl: function ( level, x, y ) {
         var url = null;
-        if( level >= this.minLevel && level <= this.maxLevel ){
+        if ( this.levels.length > 0 && level >= this.minLevel && level <= this.maxLevel ) {
             url = this.levels[ level ].url;
         }
         return url;
@@ -223,6 +231,9 @@ function filterFiles( files ){
                 height: Number( file.height )
             });
         }
+        else {
+            $.console.error( 'Unsupported image format: %s', file.url ? file.url : '<no URL>' );
+        }
     }
 
     return filtered.sort(function(a,b){

src/tilesource.js

@@ -117,8 +117,8 @@ $.TileSource = function( width, height, tileSize, tileOverlap, minLevel, maxLeve
     for ( i = 0; i < arguments.length; i++ ) {
         if ( $.isFunction( arguments[ i ] ) ) {
             callback = arguments[ i ];
-            this.addHandler( 'ready', function( placeHolderSource, readySource ){
+            this.addHandler( 'ready', function ( placeHolderSource, placeHolderArgs ) {
-                callback( readySource );
+                callback( placeHolderArgs.tileSource );
             } );
             //only one callback per constructor
             break;
@@ -301,7 +301,7 @@ $.TileSource.prototype = {
             options = $TileSource.prototype.configure.apply( _this, [ data, url ]);
             readySource = new $TileSource( options );
             _this.ready = true;
-            _this.raiseEvent( 'ready', readySource );
+            _this.raiseEvent( 'ready', { tileSource: readySource } );
         };
 
         if( url.match(/\.js$/) ){

src/viewer.js

@@ -1463,7 +1463,7 @@ function onCanvasDrag( tracker, position, delta, shift ) {
             this.viewport.applyConstraints();
         }
     }
-    this.raiseEvent( 'canvas-click', {
+    this.raiseEvent( 'canvas-drag', {
         tracker: tracker,
         position: position,
         delta: delta,