Add 'startScale' and remove 'enabled' options on zoom.

core/inject.js

@@ -161,19 +161,17 @@ Blockly.parseOptions_ = function(options) {
 /* TODO (fraser): Add documentation page:
  * https://developers.google.com/blockly/installation/zoom
  *
- * enabled
- *
- * Set to `true` to allow zooming of the main workspace.  Zooming is only
- * possible if the workspace has scrollbars.  If `false`, then the options
- * below have no effect.  Defaults to `false`.
- *
  * controls
  *
- * Set to `true` to show zoom-in and zoom-out buttons.  Defaults to `true`.
+ * Set to `true` to show zoom-in and zoom-out buttons.  Defaults to `false`.
  *
  * wheel
  *
- * Set to `true` to allow the mouse wheel to zoom.  Defaults to `true`.
+ * Set to `true` to allow the mouse wheel to zoom.  Defaults to `false`.
+ *
+ * startScale
+ *
+ * Initial magnification factor.  Defaults to `1.0`.
  *
  * maxScale
  *
@@ -194,18 +192,21 @@ Blockly.parseOptions_ = function(options) {
   // https://developers.google.com/blockly/installation/zoom
   var zoom = options['zoom'] || {};
   var zoomOptions = {};
-  zoomOptions.enabled = hasScrollbars && !!zoom['enabled'];
-  if (zoomOptions.enabled) {
   if (zoom['controls'] === undefined) {
-      zoomOptions.controls = true;
+    zoomOptions.controls = false;
   } else {
     zoomOptions.controls = !!zoom['controls'];
   }
   if (zoom['wheel'] === undefined) {
-      zoomOptions.wheel = true;
+    zoomOptions.wheel = false;
   } else {
     zoomOptions.wheel = !!zoom['wheel'];
   }
+  if (zoom['startScale'] === undefined) {
+    zoomOptions.startScale = 1;
+  } else {
+    zoomOptions.startScale = parseFloat(zoom['startScale']);
+  }
   if (zoom['maxScale'] === undefined) {
     zoomOptions.maxScale = 3;
   } else {
@@ -221,10 +222,6 @@ Blockly.parseOptions_ = function(options) {
   } else {
     zoomOptions.scaleSpeed = parseFloat(zoom['scaleSpeed']);
   }
-  } else {
-    zoomOptions.controls = false;
-    zoomOptions.wheel = false;
-  }
 
   var enableRealtime = !!options['realtime'];
   var realtimeOptions = enableRealtime ? options['realtimeOptions'] : undefined;
@@ -377,6 +374,7 @@ Blockly.createMainWorkspace_ = function(svg, options) {
   options.getMetrics = Blockly.getMainWorkspaceMetrics_;
   options.setMetrics = Blockly.setMainWorkspaceMetrics_;
   var mainWorkspace = new Blockly.WorkspaceSvg(options);
+  mainWorkspace.scale = options.zoomOptions.startScale;
   svg.appendChild(mainWorkspace.createDom('blocklyMainBackground'));
   mainWorkspace.markFocused();
 

demos/code/code.js

@@ -384,7 +384,9 @@ Code.init = function() {
        media: '../../media/',
        rtl: rtl,
        toolbox: toolbox,
-       zoom: {enabled: true}
+       zoom:
+           {controls: true,
+            wheel: true}
       });
 
   // Add to reserved word list: Local variables in execution environment (runJS)

tests/playground.html

@@ -84,9 +84,9 @@ function start() {
            scrollbars: true,
            toolbox: toolbox,
            zoom:
-             {enabled: true,
-              controls: true,
+             {controls: true,
               wheel: true,
+              startScale: 2.0,
               maxScale: 4,
               minScale: .25,
               scaleSpeed: 1.1