Plugins now support callbacks from native code.

Expanded the alert plugin to include a simple confirm method, that
uses the callback.

lib/calatrava/templates/kernel/app/calatrava.coffee

@@ -27,9 +27,8 @@ calatrava.inbound =
   fireTimer: (timerId) ->
     calatrava.bridge.timers.fireTimer(timerId)
 
-  invokeCallback: (widgetName) ->
-    extraArgs = _.map(_.toArray(arguments).slice(1), ((obj) -> obj.valueOf() if obj?))
-    calatrava.bridge.widgets.callback(widgetName).apply(this, extraArgs)
+  invokePluginCallback: (handle, data) ->
+    calatrava.bridge.plugins.invokeCallback(handle, data)
 
 calatrava.bridge.changePage = (target) ->
   calatrava.bridge.runtime.changePage(target)
@@ -180,6 +179,7 @@ calatrava.bridge.timers = (() ->
 
 calatrava.bridge.plugins = (() ->
   registered = {}
+  callbacks = {}
 
   call: (pluginName, method, argMessage) ->
     calatrava.bridge.runtime.callPlugin(pluginName, method, argMessage)
@@ -189,6 +189,14 @@ calatrava.bridge.plugins = (() ->
 
   run: (pluginName, method, argMessage) ->
     registered[pluginName](method, argMessage)
+
+  rememberCallback: (callback) ->
+    _.tap calatravaId(), (handle) ->
+      callbacks[handle] = callback
+
+  invokeCallback: (handle, data) ->
+    callbacks[handle](data)
+    delete callbacks[handle]
 )()
 
 calatrava.bridge.plugin = (name, impl) ->

lib/calatrava/templates/kernel/app/converter/controller.converter.coffee

@@ -18,15 +18,19 @@ example.converter.controller = ({views, changePage, ajax}) ->
       enabled: c != unselectableCurrency
       selected: c == selectedCurrency
 
+  performConversion = (amount) ->
+    outRate = currencyRate[outCurrency]
+    inRate = currencyRate[inCurrency]
+    views.conversionForm.render
+      out_amount: (Math.round(amount * (outRate / inRate) * 100)) / 100
+
   convert = () ->
     views.conversionForm.get 'in_amount', (inAmount) ->
       if inAmount == ""
-        calatrava.bridge.alert "Need to enter an amount to convert."
-
-      outRate = currencyRate[outCurrency]
-      inRate = currencyRate[inCurrency]
-      views.conversionForm.render
-        out_amount: (Math.round(inAmount * (outRate / inRate) * 100)) / 100
+        calatrava.confirm "No amount to convert. Convert one instead?", (convertOne) ->
+          performConversion(1) if convertOne
+      else
+        performConversion(inAmount)
 
   views.conversionForm.bind 'convert', convert
 

lib/calatrava/templates/kernel/plugins/alert.coffee

@@ -1,2 +1,9 @@
 calatrava.alert = (message) ->
-  calatrava.bridge.plugins.call('alert', 'displayModal', {message: message})
+  calatrava.bridge.plugins.call 'alert', 'displayAlert',
+    message: message
+
+calatrava.confirm = (message, onOkExecute) ->
+  okCallbackHandle = calatrava.bridge.plugins.rememberCallback(onOkExecute)
+  calatrava.bridge.plugins.call 'alert', 'displayConfirm',
+    message: message
+    okHandler: okCallbackHandle

lib/calatrava/templates/web/app/source/alert.web.coffee

@@ -1,9 +1,13 @@
 calatrava.web ?= {}
 
-calatrava.web.alert = (method, {message}) ->
-  if method != 'runModal' || !message?
+calatrava.web.alert = (method, {message, okHandler}) ->
+  if !message?
     console.log("Unable to display alert.")
 
-  window.alert(message)
+  if method == 'displayAlert'
+    window.alert(message)
+  else if method == 'displayConfirm'
+    userPressedOk = window.confirm(message)
+    calatrava.bridge.runtime.invokePluginCallback(okHandler, userPressedOk)
 
 calatrava.bridge.runtime.registerPlugin 'alert', calatrava.web.alert

lib/calatrava/templates/web/app/source/bridge.coffee

@@ -130,4 +130,7 @@ calatrava.bridge.runtime = (() ->
 
   callPlugin: (plugin, method, args) ->
     plugins[plugin](method, args)
+
+  invokePluginCallback: (handle, data) ->
+    calatrava.inbound.invokePluginCallback(handle, data)
 )()