Only allow editor script to target .gui (#67)

* Only allow editor script to target .gui

Disable .collection and .gui_script

* whitespace

.github/workflows/ci-workflow.yml

@@ -0,0 +1,19 @@
+name: CI
+
+on: [push]
+
+jobs:
+    build_and_run:
+        name: Build and run
+        runs-on: ubuntu-latest
+        steps:
+          - uses: actions/checkout@v1
+          - uses: actions/setup-java@v1
+            with:
+                java-version: '11'
+          - name: Run.sh
+            env:
+                DEFOLD_USER: bjorn.ritzl@gmail.com
+                DEFOLD_AUTH: foobar
+                DEFOLD_BOOSTRAP_COLLECTION: /test/test.collectionc
+            run: ./.travis/run.sh

.travis.yml

@@ -1,5 +1,7 @@
 sudo: required
 
+dist: bionic
+
 script:
   - sudo unlink /usr/bin/gcc && sudo ln -s /usr/bin/gcc-5 /usr/bin/gcc
   - gcc --version
@@ -15,13 +17,10 @@ addons:
 language: java
 
 jdk:
-  - oraclejdk8
+  - oraclejdk11
 
-#DEFOLD_AUTH=auth token
 env:
   global:
-    - secure: "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"
-    - DEFOLD_USER=bjorn.ritzl@king.com
     - DEFOLD_BOOSTRAP_COLLECTION=/test/test.collectionc
 
 script:

.travis/run.sh

@@ -26,11 +26,9 @@ chmod +x dmengine_headless
 echo "Downloading ${BOB_URL}"
 curl -o bob.jar ${BOB_URL}
 
-# Fetch libraries if DEFOLD_AUTH and DEFOLD_USER are set
-if [ -n "${DEFOLD_AUTH}" ] && [ -n "${DEFOLD_USER}" ]; then
+# Fetch libraries
 echo "Running bob.jar - resolving dependencies"
-	java -jar bob.jar --auth "${DEFOLD_AUTH}" --email "${DEFOLD_USER}" resolve
-fi
+java -jar bob.jar --auth "foobar" --email "john@doe.com" resolve
 
 echo "Running bob.jar - building"
 java -jar bob.jar --debug build --keep-unused

README.md

@@ -1,6 +1,6 @@
 ![](docs/logo.jpg)
 
-[![Build Status](https://travis-ci.org/britzl/monarch.svg?branch=master)](https://travis-ci.org/britzl/monarch)
+[![Build Status](https://travis-ci.com/britzl/monarch.svg?branch=master)](https://travis-ci.org/britzl/monarch)
 [![Code Coverage](https://codecov.io/gh/britzl/monarch/branch/master/graph/badge.svg)](https://codecov.io/gh/britzl/monarch)
 [![Latest Release](https://img.shields.io/github/release/britzl/monarch.svg)](https://github.com/britzl/monarch/releases)
 
@@ -19,6 +19,10 @@ Or point to the ZIP file of a [specific release](https://github.com/britzl/monar
 # Usage
 Using Monarch requires that screens are created in a certain way. Once you have one or more screens created you can start navigating between the screens.
 
+## Editor Script
+Right click in on a`.gui` file in the outline and selected the menu item, it creates a `.collection` and a `.gui_script` with the same name as the `.gui` file. It adds the file with some basic setup done to them, adding the selected gui script to the created gui scene and in turns adds the gui scene to the newly created collection.
+
+<img src="/docs/editor_script.gif" width="200px">
 
 ## Creating screens
 Monarch screens are created in individual collections and either loaded through collection proxies or created through collection factories.
@@ -31,8 +35,11 @@ For proxies the recommended setup is to create one game object per screen and pe
 * **Popup (boolean)** - Check this if the screen should be treated as a [popup](#popups).
 * **Popup on Popup (boolean)** - Check this if the screen is a [popup](#popups) and it can be shown on top of other popups.
 * **Timestep below Popup (number)** - Timestep to set on screen proxy when it is below a popup. This is useful when pausing animations and gameplay while a popup is open.
-* **Transition Url (url)** - Optional URL to call when the screen is about to be shown/hidden. Use this to trigger a transition (see the section on [transitions](#transitions)).
-* **Focus Url (url)** - Optional URL to call when the screen gains or loses focus (see the section on [screen focus](#screen-focus-gainloss)).
+* **Screen Keeps Input Focus When Below Popup (boolean)** - Check this if the screen should keep input focus when it is below a popup.
+* **Others Keep Input Focus When Below Screen (boolean)** - Check this if other screens should keep input focus when below this screen.
+* **Transition Url (url)** - Optional URL to post messages to when the screen is about to be shown/hidden. Use this to trigger a transition (see the section on [transitions](#transitions)).
+* **Focus Url (url)** - Optional URL to post messages to when the screen gains or loses focus (see the section on [screen focus](#screen-focus-gainloss)).
+* **Receiver Url (url)** - Optional URL to post messages to using `monarch.post()`.
 * **Preload (boolean)** - Check this if the screen should be preloaded and kept loaded at all times. For a collection proxy it means that it will be async loaded but not enabled at all times while not visible. This can also temporarily be achieved through the `monarch.preload()` function.
 
 ![](docs/setup_proxy.png)
@@ -44,8 +51,10 @@ For factories the recommended setup is to create one game object per screen and
 * **Screen Id (hash)** - A unique id that can be used to reference the screen when navigating your app.
 * **Popup (boolean)** - Check this if the screen should be treated as a [popup](#popups).
 * **Popup on Popup (boolean)** - Check this if the screen is a [popup](#popups) and it can be shown on top of other popups.
-* **Transition Id (url)** - Optional id of the game object to send a message to when the screen is about to be shown/hidden. Use this to trigger a transition (see the section on [transitions](#transitions)).
-* **Focus Id (url)** - Optional id of the game object to send a message to when the screen gains or loses focus (see the section on [screen focus](#screen-focus-gainloss)).
+* **Screen Keeps Input Focus When Below Popup (boolean)** - Check this if the screen should keep input focus when it is below a popup.
+* **Others Keep Input Focus When Below Screen (boolean)** - Check this if other screens should keep input focus when below this screen.
+* **Transition Id (hash)** - Optional id of the game object to send a message to when the screen is about to be shown/hidden. Use this to trigger a transition (see the section on [transitions](#transitions)).
+* **Focus Id (hash)** - Optional id of the game object to send a message to when the screen gains or loses focus (see the section on [screen focus](#screen-focus-gainloss)).
 * **Preload (boolean)** - Check this if the screen should be preloaded and kept loaded at all times. For a collection factory this means that its resources will be dynamically loaded at all times. This can also temporarily be achieved through the `monarch.preload()` function.
 
 ![](docs/setup_factory.png)
@@ -68,12 +77,12 @@ The navigation in Monarch is based around a stack of screens. When a screen is s
 ### Showing a new screen
 You show a screen in one of two ways:
 
-1. Post a ```show``` message to the ```screen.script```
+1. Post a ```show``` message to the screen script (either `screen_proxy.script` or `screen_factory.script`)
 2. Call ```monarch.show()``` (see below)
 
 Showing a screen will push it to the top of the stack and trigger an optional transition. The previous screen will be hidden (with an optional transition) unless the screen to be shown is a [popup](#popups).
 
-NOTE: You must ensure that the ```init()``` function of the ```screen.script``` has run. The ```init()``` function is responsible for registering the screen and it's not possible to show it until this has happened. A good practice is to delay the first call by posting a message to a controller script or similar before calling ```monarch.show()``` the first time:
+NOTE: You must ensure that the ```init()``` function of the screen script (either `screen_proxy.script` or `screen_factory.script`) has run. The ```init()``` function is responsible for registering the screen and it's not possible to show it until this has happened. A good practice is to delay the first call by posting a message to a controller script or similar before calling ```monarch.show()``` the first time:
 
 	function init(self)
 		msg.post("#", "show_first_screen")
@@ -108,12 +117,13 @@ Monarch can also show a screen without adding it to the stack. This can be used
 ### Going back to a previous screen
 You navigate back in the screen hierarchy in one of two ways:
 
-1. Post a ```back``` message to the ```screen.script```
+1. Post a ```back``` message to the screen script (either `screen_proxy.script` or `screen_factory.script`)
 2. Call ```monarch.back()``` (see below)
 
 
 ## Input focus
-Monarch will acquire and release input focus on the game objects containing the proxies to the screens and ensure that only the top-most screen will ever have input focus.
+Monarch will acquire and release input focus on the game objects containing the proxies to the screens and ensure that only the top-most screen will ever have input focus. The screen settings above provide a `Screen Keeps Input Focus When Below Popup` and `Others Keep Input Focus When Below Screen` setting to override this behavior so that a screen can continue to have focus. This is useful when you have for instance a tabbed popup where the tabs are in a root screen and the content of the individual tabs are separate screens. In this case you want the tabs to have input as well as the tab content.
+
 
 ## Popups
 A screen that is flagged as a popup (see [list of screen properties](#creating-screens) above) will be treated slightly differently when it comes to navigation.
@@ -147,7 +157,7 @@ If a screen is shown on top of one or more popups they will all be removed from
 
 
 ## Transitions
-You can add optional transitions when navigating between screens. The default behavior is that screen navigation is instant but if you have defined a transition for a screen Monarch will wait until the transition is completed before proceeding. The Transition Url property described above should be the URL to a script with an ```on_message``` handlers for the following messages:
+You can add optional transitions when navigating between screens. The default behavior is that screen navigation is instant but if you have defined a transition for a screen Monarch will wait until the transition is completed before proceeding. The `Transition Url` (proxy) or `Transition Id` (collectionfactory) property described above should be the URL/Id to a script with an ```on_message``` handlers for the following messages:
 
 * ```transition_show_in``` (constant defined as ```monarch.TRANSITION.SHOW_IN```)
 * ```transition_show_out``` (constant defined as ```monarch.TRANSITION.SHOW_OUT```)
@@ -182,6 +192,15 @@ Monarch comes with a system for setting up transitions easily in a gui_script us
 		end
 	end
 
+It is also possible to assign transitions to multiple nodes:
+
+	function init(self)
+		self.transition = transitions.create() -- note that no node is passed to transition.create()!
+			.show_in(gui.get_node("node1"), transitions.slide_in_right, gui.EASING_OUTQUAD, 0.6, 0)
+			.show_in(gui.get_node("node2"), transitions.slide_in_right, gui.EASING_OUTQUAD, 0.6, 0)
+	end
+
+
 The predefined transitions provided by ```monarch.transitions.gui``` are:
 
 * ```slide_in_right```
@@ -266,7 +285,7 @@ This information can be used to create dynamic transitions where the direction o
 
 
 ## Screen focus gain/loss
-Monarch will send focus gain and focus loss messages if a Focus Url was provided when the screen was created. The focus gained message will contain the id of the previous screen and the focus loss message will contain the id of the next screen. Example:
+Monarch will send focus gain and focus loss messages if a `Focus Url` (proxy) or `Focus Id` (collectionfactory) was provided when the screen was created. The focus gained message will contain the id of the previous screen and the focus loss message will contain the id of the next screen. Example:
 
 	local monarch = require "monarch.monarch"
 
@@ -286,10 +305,10 @@ Both the ```monarch.show()``` and ```monarch.back()``` functions take an optiona
 ## Monarch API
 
 ### monarch.show(screen_id, [options], [data], [callback])
-Show a Monarch screen. Note that the screen must be registered before it can be shown. The ```init()``` function of the ```screen.script``` takes care of registration.
+Show a Monarch screen. Note that the screen must be registered before it can be shown. The ```init()``` function of the screen script (either `screen_proxy.script` or `screen_factory.script`) takes care of registration. This operation will be added to the queue if Monarch is busy.
 
 **PARAMETERS**
-* ```screen_id``` (hash) - Id of the screen to show.
+* ```screen_id``` (string|hash) - Id of the screen to show.
 * ```options``` (table) - Options when showing the new screen (see below).
 * ```data``` (table) - Optional data to associate with the screen.  Retrieve using ```monarch.data()```.
 * ```callback``` (function) - Optional function to call when the new screen is visible.
@@ -299,16 +318,18 @@ The options table can contain the following fields:
 * ```clear``` (boolean) - If the `clear` flag is set Monarch will search the stack for the screen that is to be shown. If the screen already exists in the stack and the clear flag is set Monarch will remove all screens between the current top and the screen in question.
 * ```reload``` (boolean) - If the `reload` flag is set Monarch will reload the collection proxy if it's already loaded (this can happen if the previous screen was a popup).
 * ```no_stack``` (boolean) - If the `no_stack` flag is set Monarch will load the screen without adding it to the screen stack.
+* ```sequential``` (boolean) - If the `sequential` flag is set Monarch will start loading the screen only after the previous screen finished transitioning out.
+* ```pop``` (number) - If `pop` is set to a number, Monarch will pop that number of screens from the stack before adding the new one.
 
-**RETURN**
-* ```success``` (boolean) - True if the process of showing the screen was started successfully. False if already busy showing/hiding a screen.
+### monarch.replace(screen_id, [options], [data], [callback])
+Replace the top of the stack with a new screen. Equivalent to calling `monarch.show()` with `pop = 1`. It takes the same parameters as `monarch.show()`.
 
 
 ### monarch.hide(screen_id, [callback])
-Hide a screen that has been shown using the `no_stack` option. If used on a screen that was shown without the `no_stack` option it will only hide it if the screen is on top of the stack and the behavior will be exactly like if `monarch.back()` had been called.
+Hide a screen that has been shown using the `no_stack` option. If used on a screen that was shown without the `no_stack` option it will only hide it if the screen is on top of the stack and the behavior will be exactly like if `monarch.back()` had been called. This operation will be added to the queue if Monarch is busy.
 
 **PARAMETERS**
-* ```screen_id``` (hash) - Id of the screen to hide.
+* ```screen_id``` (string|hash) - Id of the screen to hide.
 * ```callback``` (function) - Optional function to call when the screen has been hidden.
 
 **RETURN**
@@ -316,21 +337,18 @@ Hide a screen that has been shown using the `no_stack` option. If used on a scre
 
 
 ### monarch.back([data], [callback])
-Go back to a previous Monarch screen
+Go back to a previous Monarch screen. This operation will be added to the queue if Monarch is busy.
 
 **PARAMETERS**
 * ```data``` (table) - Optional data to associate with the screen you are going back to.  Retrieve using ```monarch.data()```.
 * ```callback``` (function) - Optional function to call when the previous screen is visible.
 
-**RETURN**
-* ```success``` (boolean) - True if the process of going back to a previous screen was started successfully. False if already busy showing/hiding a screen.
-
 
 ### monarch.preload(screen_id, [callback])
-Preload a Monarch screen. This will load but not enable the screen. This is useful for content heavy screens that you wish to be able to show without having to wait for it load.
+Preload a Monarch screen. This will load but not enable the screen. This is useful for content heavy screens that you wish to be able to show without having to wait for it load. This operation will be added to the queue if Monarch is busy.
 
 **PARAMETERS**
-* ```screen_id``` (hash) - Id of the screen to preload.
+* ```screen_id``` (string|hash) - Id of the screen to preload.
 * ```callback``` (function) - Optional function to call when the screen is preloaded.
 
 
@@ -338,7 +356,7 @@ Preload a Monarch screen. This will load but not enable the screen. This is usef
 Check if a Monarch screen is preloading (via monarch.preload() or the Preload screen setting).
 
 **PARAMETERS**
-* ```screen_id``` (hash) - Id of the screen to check
+* ```screen_id``` (string|hash) - Id of the screen to check
 
 **RETURN**
 * ```preloading``` (boolean) - True if the screen is preloading.
@@ -348,15 +366,15 @@ Check if a Monarch screen is preloading (via monarch.preload() or the Preload sc
 Invoke a callback when a screen has been preloaded.
 
 **PARAMETERS**
-* ```screen_id``` (hash) - Id of the screen to check
+* ```screen_id``` (string|hash) - Id of the screen to check
 * ```callback``` (function) - Function to call when the screen has been preloaded.
 
 
 ### monarch.unload(screen_id, [callback])
-Unload a preloaded Monarch screen. A preloaded screen will automatically get unloaded when hidden, but this function can be useful if a screen has been preloaded and it needs to be unloaded again without actually hiding it.
+Unload a preloaded Monarch screen. A preloaded screen will automatically get unloaded when hidden, but this function can be useful if a screen has been preloaded and it needs to be unloaded again without actually hiding it. This operation will be added to the queue if Monarch is busy.
 
 **PARAMETERS**
-* ```screen_id``` (hash) - Id of the screen to unload.
+* ```screen_id``` (string|hash) - Id of the screen to unload.
 * ```callback``` (function) - Optional function to call when the screen is unloaded.
 
 
@@ -367,7 +385,7 @@ Get the id of the screen at the top of the stack.
 * ```offset``` (number) - Optional offset from the top of the stack, ie -1 to get the previous screen
 
 **RETURN**
-* ```screen_id``` (hash) - Id of the requested screen
+* ```screen_id``` (string|hash) - Id of the requested screen
 
 
 ### monarch.bottom([offset])
@@ -377,14 +395,14 @@ Get the id of the screen at the bottom of the stack.
 * ```offset``` (number) - Optional offset from the bottom of the stack
 
 **RETURN**
-* ```screen_id``` (hash) - Id of the requested screen
+* ```screen_id``` (string|hash) - Id of the requested screen
 
 
 ### monarch.data(screen_id)
 Get the data associated with a screen (from a call to ```monarch.show()``` or ```monarch.back()```).
 
 **PARAMETERS**
-* ```screen_id``` (hash) - Id of the screen to get data for
+* ```screen_id``` (string|hash) - Id of the screen to get data for
 
 **RETURN**
 * ```data``` (table) - Data associated with the screen.
@@ -394,7 +412,7 @@ Get the data associated with a screen (from a call to ```monarch.show()``` or ``
 Check if a Monarch screen exists.
 
 **PARAMETERS**
-* ```screen_id``` (hash) - Id of the screen to get data for
+* ```screen_id``` (string|hash) - Id of the screen to get data for
 
 **RETURN**
 * ```exists``` (boolean) - True if the screen exists.
@@ -407,21 +425,21 @@ Check if Monarch is busy showing and/or hiding a screen.
 * ```busy``` (boolean) - True if busy hiding and/or showing a screen.
 
 
-### monarch.is_top(id)
+### monarch.is_top(screen_id)
 Check if a Monarch screen is at the top of the view stack.
 
 **PARAMETERS**
-* ```screen_id``` (hash) - Id of the screen to check
+* ```screen_id``` (string|hash) - Id of the screen to check
 
 **RETURN**
 * ```exists``` (boolean) - True if the screen is at the top of the stack.
 
 
-### monarch.is_visible(id)
+### monarch.is_visible(screen_id)
 Check if a Monarch screen is visible.
 
 **PARAMETERS**
-* ```screen_id``` (hash) - Id of the screen to check
+* ```screen_id``` (string|hash) - Id of the screen to check
 
 **RETURN**
 * ```exists``` (boolean) - True if the screen is visible.
@@ -441,12 +459,25 @@ Remove a previously added listener.
 * ```url``` (url) - URL to remove. Will use current URL if omitted.
 
 
+### monarch.post(screen_id, message_id, [message])
+Post a message to a visible screen. If the screen is created through a collection proxy it must have specified a receiver url. If the screen is created through a collection factory the function will post the message to all game objects within the collection.
+
+**PARAMETERS**
+* ```screen_id``` (string|hash) - Id of the screen to post message to
+* ```message_id``` (string|hash) - Id of the message to send
+* ```message``` (table|nil) - Optional message data to send
+
+**RETURN**
+* ```result``` (boolean) - True if the message was sent
+* ```error``` (string|nil) - Error message if unable to send message
+
+
 ### monarch.debug()
 Enable verbose logging of the internals of Monarch.
 
 
 ### monarch.SCREEN_TRANSITION_IN_STARTED
-Message sent to listeners when a screen has started to transition in.
+Message sent to listeners added using `monarch.add_listener()` when a screen has started to transition in.
 
 **PARAMETERS**
 * ```screen``` (hash) - Id of the screen
@@ -454,7 +485,7 @@ Message sent to listeners when a screen has started to transition in.
 
 
 ### monarch.SCREEN_TRANSITION_IN_FINISHED
-Message sent to listeners when a screen has finished to transition in.
+Message sent to listeners added using `monarch.add_listener()` when a screen has finished to transition in.
 
 **PARAMETERS**
 * ```screen``` (hash) - Id of the screen
@@ -462,7 +493,7 @@ Message sent to listeners when a screen has finished to transition in.
 
 
 ### monarch.SCREEN_TRANSITION_OUT_STARTED
-Message sent to listeners when a screen has started to transition out.
+Message sent to listeners added using `monarch.add_listener()` when a screen has started to transition out.
 
 **PARAMETERS**
 * ```screen``` (hash) - Id of the screen
@@ -470,7 +501,7 @@ Message sent to listeners when a screen has started to transition out.
 
 
 ### monarch.SCREEN_TRANSITION_OUT_FINISHED
-Message sent to listeners when a screen has finished to transition out.
+Message sent to listeners added using `monarch.add_listener()` when a screen has finished to transition out.
 
 **PARAMETERS**
 * ```screen``` (hash) - Id of the screen

example/confirm.gui_script

@@ -18,9 +18,13 @@ function on_input(self, action_id, action)
 	if action_id == hash("touch") and action.released then
 		if gui.pick_node(self.yes, action.x, action.y) then
 			print("yes")
-			monarch.show(monarch.data(hash("confirm")).next, nil, nil, function()
+			if monarch.data("confirm").next then
+				monarch.show(monarch.data("confirm").next, nil, nil, function()
 					print("next screen show done")
 				end)
+			else
+				print("no next screen in data")
+			end
 		elseif gui.pick_node(self.no, action.x, action.y) then
 			print("no")
 			monarch.back(function()

example/example.collection

@@ -359,6 +359,11 @@ embedded_instances {
   "    type: PROPERTY_TYPE_BOOLEAN\n"
   "  }\n"
   "  properties {\n"
+  "    id: \"others_keep_input_focus_when_below_screen\"\n"
+  "    value: \"true\"\n"
+  "    type: PROPERTY_TYPE_BOOLEAN\n"
+  "  }\n"
+  "  properties {\n"
   "    id: \"transition_url\"\n"
   "    value: \"confirm:/go#confirm\"\n"
   "    type: PROPERTY_TYPE_URL\n"

example/main.script

@@ -8,8 +8,7 @@ end
 
 function on_message(self, message_id, message, sender)
 	if message_id == hash("init_monarch") then
-		monarch.show(hash("background"), { no_stack = true }, nil, function()
+		monarch.show(hash("background"), { no_stack = true })
 		monarch.show(hash("menu"))
-		end)
 	end
 end

game.project

@@ -4,7 +4,7 @@ version = 0.9
 dependencies = https://github.com/britzl/deftest/archive/2.7.0.zip
 
 [bootstrap]
-main_collection = /test/test.collectionc
+main_collection = /example/example.collectionc
 
 [input]
 game_binding = /input/game.input_bindingc

monarch/editor-script/make_monarch.editor_script

@@ -0,0 +1,161 @@
+local M = {}
+
+local collection_template
+local gui_script_content
+local gui_file_content
+
+local function ends_with(str, ending)
+    return ending == "" or str:sub(-#ending) == ending
+end
+
+local function file_exists(name)
+    local f=io.open(name,"r")
+    if f~=nil then io.close(f) return true else return false end
+end
+
+local function get_filename(path)   
+    local main, filename, extension = path:match("(.-)([^\\/]-%.?([^%.\\/]*))$")
+    return main, filename
+end
+
+local function create_files(file_path)
+    -- Construct paths
+    local path = editor.get(file_path, "path")
+    local main, filename = get_filename(path)
+    local basename = filename:match("(.+)%..+")
+    local target_collection_path = "." .. main .. basename .. ".collection"
+    local target_gui_script_path = "." .. main .. basename .. ".gui_script"
+    local target_gui_path = "." .. main .. basename .. ".gui"
+
+    -- Create the files if they don't exists
+    if not file_exists(target_collection_path) then
+        local collection_content = collection_template(path, basename)
+        local collection = io.open(target_collection_path, "w")
+        collection:write(collection_content)
+        collection:close()
+    end
+    if not file_exists(target_gui_script_path) then
+        local gui_script = io.open(target_gui_script_path, "w")
+        gui_script:write(gui_script_content)
+        gui_script:close()
+
+        -- Put the gui_script path into the gui file
+        local gui_file = io.open("." .. path, "rb")
+        local gui_text = gui_file:read("*a")
+        gui_file:close()
+
+        gui_text = string.gsub(gui_text, 'script: "%.*"', [[script: "]] .. main .. basename .. ".gui_script" .. [["]])
+
+        gui_file = io.open("." .. path, "w")
+        gui_file:write(gui_text)
+        gui_file:close()
+    end
+    if not file_exists(target_gui_path) then
+        local gui_content = gui_template(path)
+        local gui = io.open(target_gui_path, "w")
+        gui:write(gui_content)
+        gui:close()
+    end
+end
+
+function M.get_commands()
+    return {
+        {
+            label="Create Monarch Scene From...",
+            locations = {"Assets"},
+            query = {
+                selection = {type = "resource", cardinality = "one"}
+            },
+            active = function(opts)
+                local path = editor.get(opts.selection, "path")
+                return ends_with(path, ".gui")
+            end,
+            run = function(opts)
+                create_files(opts.selection)
+            end
+        }
+    }
+end
+
+gui_template = function(gui_script)
+    return [[script: "]].. gui_script .. [["
+background_color {
+    x: 0.0
+    y: 0.0
+    z: 0.0
+    w: 0.0
+}
+material: "/builtins/materials/gui.material"
+adjust_reference: ADJUST_REFERENCE_PARENT
+max_nodes: 512
+]] 
+end
+
+gui_script_content = [[local monarch = require "monarch.monarch"
+
+function init(self)
+    msg.post(".", "acquire_input_focus")
+end
+
+function final(self)
+end
+
+function update(self, dt)
+end
+
+function on_message(self, message_id, message, sender)
+end
+
+function on_input(self, action_id, action)
+end
+
+function on_reload(self)
+end
+]]
+
+
+collection_template = function(gui_script, name)
+    return [[name: "]].. name .. [["
+scale_along_z: 0
+embedded_instances {
+  id: "go"
+  data: "components {\n"
+  "  id: \"monarch\"\n"
+  "  component: \"]].. gui_script .. [[\"\n"
+  "  position {\n"
+  "    x: 0.0\n"
+  "    y: 0.0\n"
+  "    z: 0.0\n"
+  "  }\n"
+  "  rotation {\n"
+  "    x: 0.0\n"
+  "    y: 0.0\n"
+  "    z: 0.0\n"
+  "    w: 1.0\n"
+  "  }\n"
+  "}\n"
+  ""
+  position {
+      x: 0.0
+      y: 0.0
+      z: 0.0
+  }
+  rotation {
+      x: 0.0
+      y: 0.0
+      z: 0.0
+      w: 1.0
+  }
+  scale3 {
+      x: 1.0
+      y: 1.0
+      z: 1.0
+  }
+}
+]]
+
+end
+
+
+
+return M

monarch/monarch.lua

@@ -31,6 +31,7 @@ M.SCREEN_TRANSITION_IN_STARTED = hash("monarch_screen_transition_in_started")
 M.SCREEN_TRANSITION_IN_FINISHED = hash("monarch_screen_transition_in_finished")
 M.SCREEN_TRANSITION_OUT_STARTED = hash("monarch_screen_transition_out_started")
 M.SCREEN_TRANSITION_OUT_FINISHED = hash("monarch_screen_transition_out_finished")
+M.SCREEN_TRANSITION_FAILED = hash("monarch_screen_transition_failed")
 
 
 -- all registered screens
@@ -68,15 +69,62 @@ local function pcallfn(fn, ...)
 	end
 end
 
+local function assign(to, from)
+	if not from then
+		return to
+	end
+	for k, v in pairs(from) do
+		to[k] = v
+	end
+	return to
+end
+
 local function cowait(delay)
 	local co = coroutine.running()
-	assert(co, "You must run this form within a coroutine")
+	assert(co, "You must run this from within a coroutine")
 	timer.delay(delay, false, function()
-		coroutine.resume(co)
+		assert(coroutine.resume(co))
 	end)
 	coroutine.yield()
 end
 
+
+
+local queue = {}
+
+local function queue_error(message)
+	print(message)
+	log("queue() error - clearing queue")
+	while next(queue) do
+		table.remove(queue)
+	end
+end
+
+local process_queue
+process_queue = function()
+	if M.is_busy() then
+		log("queue() busy")
+		return
+	end
+	action = table.remove(queue, 1)
+	if not action then
+		log("queue() empty")
+		return
+	end
+	log("queue() next action", action)
+	local ok, err = pcall(action, process_queue, queue_error)
+	if not ok then
+		queue_error(err)
+	end
+end
+
+local function queue_action(action)
+	log("queue() adding", action)
+	table.insert(queue, action)
+	process_queue()
+end
+
+
 local function notify_transition_listeners(message_id, message)
 	log("notify_transition_listeners()", message_id)
 	for _,url in pairs(transition_listeners) do
@@ -150,6 +198,8 @@ local function register(id, settings)
 		popup = settings and settings.popup,
 		popup_on_popup = settings and settings.popup_on_popup,
 		timestep_below_popup = settings and settings.timestep_below_popup or 1,
+		screen_keeps_input_focus_when_below_popup = settings and settings.screen_keeps_input_focus_when_below_popup or false,
+		others_keep_input_focus_when_below_screen = settings and settings.others_keep_input_focus_when_below_screen or false,
 		preload_listeners = {},
 	}
 	return screens[id]
@@ -166,11 +216,17 @@ end
 -- 		* popup - true the screen is a popup
 --		* popup_on_popup - true if this popup can be shown on top of
 --		  another popup or false if an underlying popup should be closed
+--		* timestep_below_popup - Timestep to set on proxy when below a popup
+--		* screen_keeps_input_focus_when_below_popup - If this screen should
+--		  keep input focus when below a popup
+--		* others_keep_input_focus_when_below_screen - If screens below this
+--		  screen should keep input focus
 -- 		* transition_url - URL to a script that is responsible for the
 --		  screen transitions
 -- 		* focus_url - URL to a script that is to be notified of focus
 --		  lost/gained events
---		* timestep_below_popup - Timestep to set on proxy when below a popup
+--		* receiver_url - URL to a script that is to receive messages sent
+--		  using monarch.send()
 --		* auto_preload - true if the screen should be automatically preloaded
 function M.register_proxy(id, proxy, settings)
 	assert(proxy, "You must provide a collection proxy URL")
@@ -178,6 +234,7 @@ function M.register_proxy(id, proxy, settings)
 	screen.proxy = proxy
 	screen.transition_url = settings and settings.transition_url
 	screen.focus_url = settings and settings.focus_url
+	screen.receiver_url = settings and settings.receiver_url
 	screen.auto_preload = settings and settings.auto_preload
 	if screen.auto_preload then
 		M.preload(id)
@@ -197,6 +254,10 @@ M.register = M.register_proxy
 -- 		* popup - true the screen is a popup
 --		* popup_on_popup - true if this popup can be shown on top of
 --		  another popup or false if an underlying popup should be closed
+--		* screen_keeps_input_focus_when_below_popup - If this screen should
+--		  keep input focus when below a popup
+--		* others_keep_input_focus_when_below_screen - If screens below this
+--		  screen should keep input focus
 -- 		* transition_id - Id of the game object in the collection that is responsible
 --		  for the screen transitions
 -- 		* focus_id - Id of the game object in the collection that is to be notified
@@ -221,11 +282,13 @@ function M.unregister(id)
 	assert(id, "You must provide a screen id")
 	id = tohash(id)
 	assert(screens[id], ("There is no screen registered with id %s"):format(tostring(id)))
+	log("unregister()", id)
+	local screen = screens[id]
 	screens[id] = nil
 end
 
 local function acquire_input(screen)
-	log("change_context()", screen.id)
+	log("acquire_input()", screen.id)
 	if not screen.input then
 		if screen.proxy then
 			msg.post(screen.script, ACQUIRE_INPUT_FOCUS)
@@ -238,9 +301,16 @@ local function acquire_input(screen)
 	end
 end
 
-local function release_input(screen)
-	log("change_context()", screen.id)
+local function release_input(screen, next_screen)
+	log("release_input()", screen.id)
 	if screen.input then
+		local next_is_popup = next_screen and next_screen.popup
+
+		local keep_if_next_is_popup = next_is_popup and screen.screen_keeps_input_focus_when_below_popup
+		local keep_when_below_next = next_screen and next_screen.others_keep_input_focus_when_below_screen
+
+		local release_focus = not keep_if_next_is_popup and not keep_when_below_next
+		if release_focus then
 			if screen.proxy then
 				msg.post(screen.script, RELEASE_INPUT_FOCUS)
 			elseif screen.factory then
@@ -251,6 +321,7 @@ local function release_input(screen)
 			screen.input = false
 		end
 	end
+end
 
 local function change_context(screen)
 	log("change_context()", screen.id)
@@ -261,9 +332,8 @@ local function change_context(screen)
 end
 
 local function unload(screen, force)
-	log("unload()", screen.id)
-
 	if screen.proxy then
+		log("unload() proxy", screen.id)
 		if screen.auto_preload and not force then
 			msg.post(screen.proxy, DISABLE)
 			screen.loaded = false
@@ -277,6 +347,7 @@ local function unload(screen, force)
 			screen.wait_for = nil
 		end
 	elseif screen.factory then
+		log("unload() factory", screen.id)
 		for id, instance in pairs(screen.factory_ids) do
 			go.delete(instance)
 		end
@@ -290,6 +361,11 @@ local function unload(screen, force)
 			screen.preloaded = false
 		end
 	end
+	-- we need to wait here in case the unloaded screen contained any screens
+	-- if this is the case we need to let these sub-screens have their final()
+	-- functions called so that they have time to call unregister()
+	cowait(0)
+	cowait(0)
 end
 
 
@@ -299,14 +375,24 @@ local function preload(screen)
 
 	if screen.preloaded then
 		log("preload() screen already preloaded", screen.id)
-		return
+		return true
 	end
 
+	screen.preloading = true
 	if screen.proxy then
+		log("preload() proxy")
+		local missing_resources = collectionproxy.missing_resources(screen.proxy)
+		if #missing_resources > 0 then
+			local error_message = ("preload() collection proxy %s is missing resources"):format(tostring(screen.id))
+			log(error_message)
+			screen.preloading = false
+			return false, error_message
+		end
 		screen.wait_for = PROXY_LOADED
 		msg.post(screen.proxy, ASYNC_LOAD)
 		coroutine.yield()
 	elseif screen.factory then
+		log("preload() factory")
 		if collectionfactory.get_status(screen.factory) == collectionfactory.STATUS_UNLOADED then
 			collectionfactory.load(screen.factory, function(self, url, result)
 				assert(coroutine.resume(screen.co))
@@ -315,11 +401,16 @@ local function preload(screen)
 		end
 
 		if collectionfactory.get_status(screen.factory) ~= collectionfactory.STATUS_LOADED then
-			log("preload() error loading factory resources")
-			return
+			local error_message = ("preload() error while loading factory resources for screen %s"):format(tostring(screen.id))
+			log(error_message)
+			screen.preloading = false
+			return false, error_message
 		end
 	end
+	log("preload() preloading done", screen.id)
 	screen.preloaded = true
+	screen.preloading = false
+	return true
 end
 
 local function load(screen)
@@ -328,14 +419,13 @@ local function load(screen)
 
 	if screen.loaded then
 		log("load() screen already loaded", screen.id)
-		return
+		return true
 	end
 
-	preload(screen)
-
-	if not screen.preloaded then
+	local ok, err = preload(screen)
+	if not ok then
 		log("load() screen wasn't preloaded", screen.id)
-		return
+		return false, err
 	end
 
 	if screen.proxy then
@@ -347,6 +437,7 @@ local function load(screen)
 	end
 	screen.loaded = true
 	screen.preloaded = false
+	return true
 end
 
 local function transition(screen, message_id, message)
@@ -398,13 +489,16 @@ local function reset_timestep(screen)
 	end
 end
 
-local function run_coroutine(screen, cb, fn)
+local function run_coroutine(screen, done_cb, fn)
 	local co
 	co = coroutine.create(function()
 		screen.co = co
+		-- don't pcall the function!
+		-- it may contain a call to for instance change_context()
+		-- this will result in a yield across metamethod/C call boundary
 		fn()
 		screen.co = nil
-		pcallfn(cb)
+		pcallfn(done_cb)
 	end)
 	assert(coroutine.resume(co))
 end
@@ -413,7 +507,7 @@ local function disable(screen, next_screen)
 	log("disable()", screen.id)
 	run_coroutine(screen, nil, function()
 		change_context(screen)
-		release_input(screen)
+		release_input(screen, next_screen)
 		focus_lost(screen, next_screen)
 		if next_screen and next_screen.popup then
 			change_timestep(screen)
@@ -439,7 +533,7 @@ local function show_out(screen, next_screen, cb)
 		active_transition_count = active_transition_count + 1
 		notify_transition_listeners(M.SCREEN_TRANSITION_OUT_STARTED, { screen = screen.id, next_screen = next_screen.id })
 		change_context(screen)
-		release_input(screen)
+		release_input(screen, next_screen)
 		focus_lost(screen, next_screen)
 		reset_timestep(screen)
 		-- if the next screen is a popup we want the current screen to stay visible below the popup
@@ -467,7 +561,13 @@ local function show_in(screen, previous_screen, reload, add_to_stack, cb)
 			log("show_in() reloading", screen.id)
 			unload(screen, reload)
 		end
-		load(screen)
+		local ok, err = load(screen)
+		if not ok then
+			log("show_in()", err)
+			active_transition_count = active_transition_count - 1
+			notify_transition_listeners(M.SCREEN_TRANSITION_FAILED, { screen = screen.id })
+			return
+		end
 		if add_to_stack then
 			stack[#stack + 1] = screen
 		end
@@ -486,7 +586,13 @@ local function back_in(screen, previous_screen, cb)
 		active_transition_count = active_transition_count + 1
 		notify_transition_listeners(M.SCREEN_TRANSITION_IN_STARTED, { screen = screen.id, previous_screen = previous_screen and previous_screen.id })
 		change_context(screen)
-		load(screen)
+		local ok, err = load(screen)
+		if not ok then
+			log("back_in()", err)
+			active_transition_count = active_transition_count - 1
+			notify_transition_listeners(M.SCREEN_TRANSITION_FAILED, { screen = screen.id })
+			return
+		end
 		reset_timestep(screen)
 		if previous_screen and not previous_screen.popup then
 			transition(screen, M.TRANSITION.BACK_IN, { previous_screen = previous_screen.id })
@@ -504,7 +610,7 @@ local function back_out(screen, next_screen, cb)
 		notify_transition_listeners(M.SCREEN_TRANSITION_OUT_STARTED, { screen = screen.id, next_screen = next_screen and next_screen.id })
 		active_transition_count = active_transition_count + 1
 		change_context(screen)
-		release_input(screen)
+		release_input(screen, next_screen)
 		focus_lost(screen, next_screen)
 		if next_screen and screen.popup then
 			reset_timestep(next_screen)
@@ -551,55 +657,69 @@ end
 -- 		* clear - Set to true if the stack should be cleared down to an existing instance of the screen
 -- 		* reload - Set to true if screen should be reloaded if it already exists in the stack and is loaded.
 --				   This would be the case if doing a show() from a popup on the screen just below the popup.
+-- 		* sequential - Set to true to wait for the previous screen to show itself out before starting the
+--				   show in transition even when transitioning to a different scene ID.
+-- 		* no_stack - Set to true to load the screen without adding it to the screen stack.
+-- 		* pop - The number of screens to pop from the stack before adding the new one.
 -- @param data (*) - Optional data to set on the screen. Can be retrieved by the data() function
 -- @param cb (function) - Optional callback to invoke when screen is shown
--- @return success True if screen is successfully shown, false if busy performing another operation
 function M.show(id, options, data, cb)
 	assert(id, "You must provide a screen id")
-	if M.is_busy() then
-		log("show() monarch is busy, ignoring request")
-		return false
-	end
-
-	local callbacks = callback_tracker()
-
 	id = tohash(id)
 	assert(screens[id], ("There is no screen registered with id %s"):format(tostring(id)))
 
+	log("show() queuing action", id)
+	queue_action(function(action_done, action_error)
+		log("show()", id)
 		local screen = screens[id]
+		if not screen then
+			action_error(("show() there is no longer a screen with id %s"):format(tostring(id)))
+			return
+		end
 		screen.data = data
 
-	log("show()", screen.id)
-
 		local co
 		co = coroutine.create(function()
+
+			local callbacks = callback_tracker()
+
+			local top = stack[#stack]
 			-- a screen can ignore the stack by setting the no_stack to true
 			local add_to_stack = not options or not options.no_stack
-		if add_to_stack then
+			if add_to_stack and top then
 				-- manipulate the current top
 				-- close popup(s) if needed
 				-- transition out
-			local top = stack[#stack]
-			if top then
+				local pop = options and options.pop or 0
+				local is_not_popup = not screen.popup
+				local pop_all_popups = is_not_popup -- pop all popups when transitioning screens
+
 				-- keep top popup visible if new screen can be shown on top of a popup
-				if top.popup and screen.popup_on_popup then
+				if top.popup and screen.popup and screen.popup_on_popup then
 					disable(top, screen)
 				else
-					-- close all popups, one by one
-					while top.popup do
+					pop_all_popups = true
+				end
+
+				-- close popups, one by one, either all of them or the number specified by options.pop
+				while top and top.popup do
+					if not pop_all_popups then
+						if pop <= 0 then break end
+						pop = pop - 1
+					end
 					stack[#stack] = nil
-						show_out(top, screen, function()
-							coroutine.resume(co)
-						end)
-						coroutine.yield()
+					show_out(top, screen, callbacks.track())
+					callbacks.yield_until_done()
 					top = stack[#stack]
 				end
-					-- unload and transition out from top
-					-- unless we're showing the same screen as is already visible
-					if top and top.id ~= screen.id then
+
+				-- unload the previous screen and transition out from top
+				-- wait until we are done if showing the same screen as is already visible
+				if top and not top.popup then
+					local same_screen = top and top.id == screen.id
 					show_out(top, screen, callbacks.track())
-					end
-				end
+					if same_screen or (options and options.sequential) then
+						callbacks.yield_until_done()
 					end
 				end
 
@@ -614,22 +734,49 @@ function M.show(id, options, data, cb)
 					end
 				end
 
+				-- pop screens off the stack
+				if is_not_popup then
+					for i = 1, pop do
+						local stack_top = #stack
+						if stack_top < 1 then break end
+						stack[stack_top] = nil
+					end
+				end
+			end
+
 			-- show screen, wait until preloaded if it is already preloading
 			-- this can typpically happen if you do a show() on app start for a
 			-- screen that has Preload set to true
 			if M.is_preloading(id) then
 				M.when_preloaded(id, function()
-				coroutine.resume(co)
+					assert(coroutine.resume(co))
 				end)
 				coroutine.yield()
 			end
 			show_in(screen, top, options and options.reload, add_to_stack, callbacks.track())
 
-		if cb then callbacks.when_done(cb) end
+			callbacks.when_done(function()
+				pcallfn(cb)
+				pcallfn(action_done)
 			end)
-	coroutine.resume(co)
+		end)
+		assert(coroutine.resume(co))
+	end)
+	return true -- return true for legacy reasons (before queue existed)
+end
 
-	return true
+
+--- Replace the top of the stack with a new screen
+-- @param id (string|hash) - Id of the screen to show
+-- @param options (table) - Table with options when showing the screen (can be nil). Valid values:
+-- 		* clear - Set to true if the stack should be cleared down to an existing instance of the screen
+-- 		* reload - Set to true if screen should be reloaded if it already exists in the stack and is loaded.
+--				   This would be the case if doing a show() from a popup on the screen just below the popup.
+-- 		* no_stack - Set to true to load the screen without adding it to the screen stack.
+-- @param data (*) - Optional data to set on the screen. Can be retrieved by the data() function
+-- @param cb (function) - Optional callback to invoke when screen is shown
+function M.replace(id, options, data, cb)
+	return M.show(id, assign({ pop = 1 }, options), data, cb)
 end
 
 
@@ -637,18 +784,12 @@ end
 -- visible but not added to the stack (through the no_stack option)
 -- @param id (string|hash) - Id of the screen to show
 -- @param cb (function) - Optional callback to invoke when the screen is hidden
--- @return true if successfully hiding, false if busy performing another operation
+-- @return true if successfully hiding, false if busy or for some other reason unable to hide the screen
 function M.hide(id, cb)
-	if M.is_busy() then
-		log("hide() monarch is busy, ignoring request")
-		return false
-	end
-	
+	assert(id, "You must provide a screen id")
 	id = tohash(id)
 	assert(screens[id], ("There is no screen registered with id %s"):format(tostring(id)))
 
-	local screen = screens[id]
-	log("hide()", screen.id)
 	if M.in_stack(id) then
 		if not M.is_top(id) then
 			log("hide() you can only hide the screen at the top of the stack", id)
@@ -656,28 +797,36 @@ function M.hide(id, cb)
 		end
 		return M.back(id, cb)
 	else
+		log("hide() queuing action", id)
+		queue_action(function(action_done, action_error)
+			log("hide()", id)
+			local callbacks = callback_tracker()
 			if M.is_visible(id) then
-			back_out(screen, nil, cb)
-		else
-			pcallfn(cb)
+				local screen = screens[id]
+				if not screen then
+					action_error(("hide() there is no longer a screen with id %s"):format(tostring(id)))
+					return
 				end
+				back_out(screen, nil, callbacks.track())
+			end
+			callbacks.when_done(function()
+				pcallfn(cb)
+				pcallfn(action_done)
+			end)
+		end)
 	end
 	return true
 end
 
 
--- Go back to the previous screen in the stack
+-- Go back to the previous screen in the stack.
 -- @param data (*) - Optional data to set for the previous screen
 -- @param cb (function) - Optional callback to invoke when the previous screen is visible again
--- @return true if successfully going back, false if busy performing another operation
 function M.back(data, cb)
-	if M.is_busy() then
-		log("back() monarch is busy, ignoring request")
-		return false
-	end
+	log("back() queuing action")
 
+	queue_action(function(action_done)
 		local callbacks = callback_tracker()
-
 		local screen = table.remove(stack)
 		if screen then
 			log("back()", screen.id)
@@ -692,7 +841,7 @@ function M.back(data, cb)
 					back_in(top, screen, callbacks.track())
 				end)
 			else
-			back_out(screen, top)
+				back_out(screen, top, callbacks.track())
 				if top then
 					if data then
 						top.data = data
@@ -702,9 +851,13 @@ function M.back(data, cb)
 			end
 		end
 
-	if cb then callbacks.when_done(cb) end
+		callbacks.when_done(function()
+			pcallfn(cb)
+			pcallfn(action_done)
+		end)
+	end)
 
-	return true
+	return true -- return true for legacy reasons (before queue existed)
 end
 
 
@@ -719,7 +872,13 @@ function M.is_preloading(id)
 	local screen = screens[id]
 	return screen.preloading
 end
-
+function M.is_preloaded(id)
+	assert(id, "You must provide a screen id")
+	id = tohash(id)
+	assert(screens[id], ("There is no screen registered with id %s"):format(tostring(id)))
+	local screen = screens[id]
+	return screen.preloaded
+end
 
 --- Invoke a callback when a specific screen has been preloaded
 -- This is mainly useful on app start when wanting to show a screen that
@@ -743,20 +902,24 @@ end
 -- @param id (string|hash) - Id of the screen to preload
 -- @param cb (function) - Optional callback to invoke when screen is loaded
 function M.preload(id, cb)
-	if M.is_busy() then
-		log("preload() monarch is busy, ignoring request")
-		return false
-	end
-
 	assert(id, "You must provide a screen id")
 	id = tohash(id)
 	assert(screens[id], ("There is no screen registered with id %s"):format(tostring(id)))
 
+	log("preload() queuing action", id)
+	queue_action(function(action_done, action_error)
+		log("preload()", id)
+
 		local screen = screens[id]
-	log("preload()", screen.id)
+		if not screen then
+			action_error(("preload() there is no longer a screen with id %s"):format(tostring(id)))
+			return
+		end
+
 		if screen.preloaded or screen.loaded then
 			pcallfn(cb)
-		return true
+			pcallfn(action_done)
+			return
 		end
 
 		local function when_preloaded()
@@ -766,14 +929,17 @@ function M.preload(id, cb)
 			end
 			-- invoke the normal callback
 			pcallfn(cb)
+			pcallfn(action_done)
 		end
 		run_coroutine(screen, when_preloaded, function()
-		screen.preloading = true
 			change_context(screen)
-		preload(screen)
-		screen.preloading = false
+			local ok, err = preload(screen)
+			if not ok then
+				action_error(err)
+			end
 		end)
-	return true
+	end)
+	return true -- return true for legacy reasons (before queue existed)
 end
 
 
@@ -781,30 +947,77 @@ end
 -- @param id (string|hash) - Id of the screen to unload
 -- @param cb (function) - Optional callback to invoke when screen is unloaded
 function M.unload(id, cb)
-	if M.is_busy() then
-		log("unload() monarch is busy, ignoring request")
-		return false
-	end
 	assert(id, "You must provide a screen id")
 	id = tohash(id)
 	assert(screens[id], ("There is no screen registered with id %s"):format(tostring(id)))
 
+	log("unload() queuing action", id)
+	queue_action(function(action_done, action_error)
 		if M.is_visible(id) then
-		log("You can't unload a visible screen")
-		return false
+			action_error("unload() you can't unload a visible screen")
+			return
 		end
 
+		log("unload()", id)
 		local screen = screens[id]
-	log("unload()", screen.id)
+		if not screen then
+			action_error(("unload() there is no longer a screen with id %s"):format(tostring(id)))
+			return
+		end
+
 		if not screen.preloaded and not screen.loaded then
 			log("unload() screen is not loaded", tostring(id))
 			pcallfn(cb)
-		return true
+			pcallfn(action_done)
+			return
 		end
-	run_coroutine(screen, cb, function()
+
+		local function when_unloaded()
+			pcallfn(cb)
+			pcallfn(action_done)
+		end
+		run_coroutine(screen, when_unloaded, function()
 			change_context(screen)
 			unload(screen)
 		end)
+	end)
+	return true -- return true for legacy reasons (before queue existed)
+end
+
+
+--- Post a message to a screen (using msg.post)
+-- @param id (string|hash) Id of the screen to send message to
+-- @param message_id (string|hash) Id of the message to send
+-- @param message (table|nil) Optional message data to send
+-- @return result (boolean) true if successful
+-- @return error (string|nil) Error message if unable to send message
+function M.post(id, message_id, message)
+	assert(id, "You must provide a screen id")
+	if not M.is_visible(id) then
+		return false, "Unable to post message to screen if it isn't visible"
+	end
+
+	assert(message_id, "You must provide a message_id")
+	id = tohash(id)
+	assert(screens[id], ("There is no screen registered with id %s"):format(tostring(id)))
+
+	local screen = screens[id]
+	if screen.proxy then
+		if screen.receiver_url then
+			log("post() sending message to", screen.receiver_url)
+			msg.post(screen.receiver_url, message_id, message)
+		else
+			return false, "Unable to post message since screen has no receiver url specified"
+		end
+	else
+		run_coroutine(screen, nil, function()
+			change_context(screen)
+			log("post() sending message to", screen.receiver_url)
+			for id,instance in pairs(screen.factory_ids) do
+				msg.post(instance, message_id, message)
+			end
+		end)
+	end
 	return true
 end
 

monarch/screen_factory.script

@@ -4,6 +4,8 @@ go.property("screen_factory", msg.url("#collectionfactory"))
 go.property("screen_id", hash("UNIQUE ID HERE"))
 go.property("popup", false)
 go.property("popup_on_popup", false)
+go.property("screen_keeps_input_focus_when_below_popup", false)
+go.property("others_keep_input_focus_when_below_screen", false)
 go.property("transition_id", hash(""))
 go.property("focus_id", hash(""))
 go.property("preload", false)
@@ -17,6 +19,8 @@ function init(self)
 	local settings = {
 		popup = self.popup,
 		popup_on_popup = self.popup_on_popup,
+		screen_keeps_input_focus_when_below_popup = self.screen_keeps_input_focus_when_below_popup,
+		others_keep_input_focus_when_below_screen = self.others_keep_input_focus_when_below_screen,
 		transition_id = self.transition_id,
 		focus_id = self.focus_id,
 		auto_preload = self.preload,

monarch/screen_proxy.script

@@ -5,8 +5,11 @@ go.property("screen_id", hash("UNIQUE ID HERE"))
 go.property("popup", false)
 go.property("popup_on_popup", false)
 go.property("timestep_below_popup", 1)
+go.property("screen_keeps_input_focus_when_below_popup", false)
+go.property("others_keep_input_focus_when_below_screen", false)
 go.property("transition_url", msg.url())
 go.property("focus_url", msg.url())
+go.property("receiver_url", msg.url())
 go.property("preload", false)
 
 
@@ -22,7 +25,10 @@ function init(self)
 		popup_on_popup = self.popup_on_popup,
 		transition_url = self.transition_url ~= url and self.transition_url or nil,
 		focus_url = self.focus_url ~= url and self.focus_url or nil,
+		receiver_url = self.receiver_url ~= url and self.receiver_url or nil,
 		timestep_below_popup = self.timestep_below_popup,
+		screen_keeps_input_focus_when_below_popup = self.screen_keeps_input_focus_when_below_popup,
+		others_keep_input_focus_when_below_screen = self.others_keep_input_focus_when_below_screen,
 		auto_preload = self.preload,
 	}
 

monarch/transitions/gui.lua

@@ -104,73 +104,117 @@ function M.fade_in(node, from, easing, duration, delay, cb)
 	gui.animate(node, gui.PROP_COLOR, to, easing, duration, delay, cb)
 end
 
---- Create a transition for a node
--- @return Transition instance
-function M.create(node)
-	assert(node, "You must provide a node")
 
+
+--- Create a transition
+-- @return Transition instance
+local function create()
 	local instance = {}
 
-	local transitions = {}
+	local transitions = {
+		[monarch.TRANSITION.SHOW_IN] = { urls = {}, transitions = {}, in_progress_count = 0, },
+		[monarch.TRANSITION.SHOW_OUT] = { urls = {}, transitions = {}, in_progress_count = 0, },
+		[monarch.TRANSITION.BACK_IN] = { urls = {}, transitions = {}, in_progress_count = 0, },
+		[monarch.TRANSITION.BACK_OUT] = { urls = {}, transitions = {}, in_progress_count = 0, },
+	}
 
 	local current_transition = nil
 
-	local initial_data = {}
-	initial_data.pos = gui.get_position(node)
-	initial_data.scale = gui.get_scale(node)
-
-	local function create_transition(fn, easing, duration, delay)
-		return {
+	local function create_transition(transition_id, node, fn, easing, duration, delay)
+		local t = transitions[transition_id]
+		-- find if there's already a transition for the node in
+		-- question and if so update it instead of creating a new
+		-- transition
+		for _,transition in ipairs(t) do
+			if transition.node == node then
+				transition.fn = fn
+				transition.easing = easing
+				transition.duration = duration
+				transitions.delay = delay
+				return
+			end
+		end
+		-- create new transition
+		t.transitions[#t.transitions + 1] = {
+			node = node,
+			node_data = {
+				pos = gui.get_position(node),
+				scale = gui.get_scale(node),
+			},
 			fn = fn,
 			easing = easing,
 			duration = duration,
 			delay = delay,
-			in_progress = false,
-			urls = {},
-			id = nil
+			id = transition_id
 		}
 	end
 
-	local function finish_transition(transition)
-		transition.in_progress = false
-		local message = { transition = transition.id }
-		while #transition.urls > 0 do
-			local url = table.remove(transition.urls)
+	local function finish_transition(transition_id)
+		local t = transitions[transition_id]
+		if #t.urls > 0 then
+			local message = { transition = transition_id }
+			while #t.urls > 0 do
+				local url = table.remove(t.urls)
 				msg.post(url, monarch.TRANSITION.DONE, message)
 			end
 		end
+		current_transition = nil
+	end
 
-	local function start_transition(transition, transition_id, url)
-		table.insert(transition.urls, url)
-		if not transition.in_progress then
-			table.insert(transition.urls, msg.url())
-			transition.in_progress = true
-			transition.id = transition_id
-			current_transition = transition
-			transition.fn(node, initial_data, transition.easing, transition.duration, transition.delay or 0, function()
-				finish_transition(transition)
+	local function check_and_finish_transition(transition_id)
+		local t = transitions[transition_id]
+		if t.in_progress_count == 0 then
+			finish_transition(transition_id)
+		end
+	end
+
+	local function start_transition(transition_id, url)
+		local t = transitions[transition_id]
+		table.insert(t.urls, url)
+		if t.in_progress_count == 0 then
+			table.insert(t.urls, msg.url())
+			current_transition = t
+			current_transition.id = transition_id
+			if #t.transitions > 0 then
+				for i=1,#t.transitions do
+					local transition = t.transitions[i]
+					t.in_progress_count = t.in_progress_count + 1
+					transition.fn(transition.node, transition.node_data, transition.easing, transition.duration, transition.delay or 0, function()
+						t.in_progress_count = t.in_progress_count - 1
+						check_and_finish_transition(transition_id)
 					end)
 				end
+			else
+				check_and_finish_transition(transition_id)
+			end
+		end
 	end
 
 	-- Forward on_message calls here
 	function instance.handle(message_id, message, sender)
 		if message_id == LAYOUT_CHANGED then
-			initial_data.pos = gui.get_position(node)
+			for _,t in pairs(transitions) do
+				for _,transitions in pairs(t.transitions) do
+					transitions.node_data.pos = gui.get_position(transitions.node)
+				end
+			end
 			-- replay the current transition if the layout changes
 			-- this will ensure that things are still hidden if they
 			-- were transitioned out
 			if current_transition then
-				current_transition.fn(node, initial_data, current_transition.easing, 0, 0)
-				if current_transition.in_progress then
-					finish_transition(current_transition)
+				for _,transition in pairs(current_transition.transitions) do
+					local node = transition.node
+					transition.fn(transition.node, transition.node_data, transition.easing, 0, 0)
+				end
+				if current_transition.in_progress_count > 0 then
+					finish_transition(current_transition.id)
 				end
 			end
-		else
-			local transition = transitions[message_id]
-			if transition then
-				start_transition(transition, message_id, sender)
-			end
+		elseif message_id == monarch.TRANSITION.SHOW_IN
+		or message_id == monarch.TRANSITION.SHOW_OUT
+		or message_id == monarch.TRANSITION.BACK_IN
+		or message_id == monarch.TRANSITION.BACK_OUT then
+			start_transition(message_id, sender)
 		end
 	end
 
@@ -180,38 +224,57 @@ function M.create(node)
 	-- @param easing Easing function to use
 	-- @param duration Transition duration
 	-- @param delay Transition delay
-	function instance.show_in(fn, easing, duration, delay)
-		transitions[monarch.TRANSITION.SHOW_IN] = create_transition(fn, easing, duration, delay)
+	function instance.show_in(node, fn, easing, duration, delay)
+		create_transition(monarch.TRANSITION.SHOW_IN, node, fn, easing, duration, delay)
 		return instance
 	end
 
 	-- Specify the transition function when this node is transitioned
 	-- from when showing another screen
-	function instance.show_out(fn, easing, duration, delay)
-		transitions[monarch.TRANSITION.SHOW_OUT] = create_transition(fn, easing, duration, delay)
+	function instance.show_out(node, fn, easing, duration, delay)
+		create_transition(monarch.TRANSITION.SHOW_OUT, node, fn, easing, duration, delay)
 		return instance
 	end
 
 	--- Specify the transition function when this node is transitioned
 	-- to when navigating back in the screen stack
-	function instance.back_in(fn, easing, duration, delay)
-		transitions[monarch.TRANSITION.BACK_IN] = create_transition(fn, easing, duration, delay)
+	function instance.back_in(node, fn, easing, duration, delay)
+		create_transition(monarch.TRANSITION.BACK_IN, node, fn, easing, duration, delay)
 		return instance
 	end
 
 	--- Specify the transition function when this node is transitioned
 	-- from when navigating back in the screen stack
-	function instance.back_out(fn, easing, duration, delay)
-		transitions[monarch.TRANSITION.BACK_OUT] = create_transition(fn, easing, duration, delay)
+	function instance.back_out(node, fn, easing, duration, delay)
+		create_transition(monarch.TRANSITION.BACK_OUT, node, fn, easing, duration, delay)
 		return instance
 	end
 
-	-- set default transitions (instant)
-	instance.show_in(M.instant)
-	instance.show_out(M.instant)
-	instance.back_in(M.instant)
-	instance.back_out(M.instant)
+	return instance
+end
 
+function M.create(node)
+	local instance = create()
+	-- backward compatibility with the old version of create
+	-- where a single node was used
+	if node then
+		local show_in = instance.show_in
+		local show_out = instance.show_out
+		local back_in = instance.back_in
+		local back_out = instance.back_out
+		instance.show_in = function(fn, easing, duration, delay)
+			return show_in(node, fn, easing, duration, delay)
+		end
+		instance.show_out = function(fn, easing, duration, delay)
+			return show_out(node, fn, easing, duration, delay)
+		end
+		instance.back_in = function(fn, easing, duration, delay)
+			return back_in(node, fn, easing, duration, delay)
+		end
+		instance.back_out = function(fn, easing, duration, delay)
+			return back_out(node, fn, easing, duration, delay)
+		end
+	end
 	return instance
 end
 

monarch/utils/callback_tracker.lua

@@ -7,6 +7,10 @@ function M.create()
 	local callback = nil
 	local callback_count = 0
 
+	local function is_done()
+		return callback_count == 0
+	end
+
 	local function invoke_if_done()
 		if callback_count == 0 and callback then
 			local ok, err = pcall(callback)
@@ -18,9 +22,15 @@ function M.create()
 	-- @return Callback function
 	function instance.track()
 		callback_count = callback_count + 1
+		local done = false
 		return function()
+			if done then
+				return false, "The callback has already been invoked once"
+			end
+			done = true
 			callback_count = callback_count - 1
 			invoke_if_done()
+			return true
 		end
 	end
 
@@ -31,6 +41,20 @@ function M.create()
 		invoke_if_done()
 	end
 
+	function instance.yield_until_done()
+		local co = coroutine.running()
+		callback = function()
+			local ok, err = coroutine.resume(co)
+			if not ok then
+				print(err)
+			end
+		end
+		invoke_if_done()
+		if not is_done() then
+			coroutine.yield()
+		end
+	end
+
 	return instance
 end
 

test/cowait.lua

@@ -1,38 +1,25 @@
 local M = {}
 
-
-local instances = {}
-
-local function create(fn)
-	local instance = {
-		co = coroutine.running(),
-		fn = fn,
-	}
-	table.insert(instances, instance)
-	coroutine.yield(instance.co)
-end
-
-	
-
 function M.seconds(amount)
-	local time = socket.gettime() + amount
-	create(function()
-		return socket.gettime() >= time
+	local co = coroutine.running()
+	assert(co, "You must run this from within a coroutine")
+	timer.delay(amount, false, function()
+		coroutine.resume(co)
 	end)
+	coroutine.yield()
 end
 
-
-function M.eval(fn)
-	create(fn)
-end
-
-function M.update()
-	for k,instance in pairs(instances) do
-		if instance.fn() then
-			instances[k] = nil
-			coroutine.resume(instance.co)
-		end
+function M.eval(fn, timeout)
+	local co = coroutine.running()
+	assert(co, "You must run this from within a coroutine")
+	local start = socket.gettime()
+	timer.delay(0.01, true, function(self, handle, time_elapsed)
+		if fn() or (timeout and socket.gettime() > (start + timeout)) then
+			timer.cancel(handle)
+			coroutine.resume(co)
 		end
+	end)
+	coroutine.yield()
 end
 
 return setmetatable(M, {

test/cowait.script

@@ -1,5 +0,0 @@
-local cowait = require "test.cowait"
-
-function update(self, dt)
-	cowait.update()
-end

test/data/child.collection

@@ -0,0 +1,22 @@
+name: "child"
+scale_along_z: 0
+embedded_instances {
+  id: "go"
+  data: ""
+  position {
+    x: 0.0
+    y: 0.0
+    z: 0.0
+  }
+  rotation {
+    x: 0.0
+    y: 0.0
+    z: 0.0
+    w: 1.0
+  }
+  scale3 {
+    x: 1.0
+    y: 1.0
+    z: 1.0
+  }
+}

test/data/screen1.gui_script

@@ -7,6 +7,7 @@ function final(self)
 end
 
 function on_message(self, message_id, message, sender)
-	-- Add message-handling code here
-	-- Remove this function if not needed
+	if message_id == hash("foobar") then
+		_G.screen1_foobar = message or true
+	end
 end

test/data/screen2.collection

@@ -35,3 +35,66 @@ embedded_instances {
     z: 1.0
   }
 }
+embedded_instances {
+  id: "child"
+  data: "components {\n"
+  "  id: \"screen_proxy\"\n"
+  "  component: \"/monarch/screen_proxy.script\"\n"
+  "  position {\n"
+  "    x: 0.0\n"
+  "    y: 0.0\n"
+  "    z: 0.0\n"
+  "  }\n"
+  "  rotation {\n"
+  "    x: 0.0\n"
+  "    y: 0.0\n"
+  "    z: 0.0\n"
+  "    w: 1.0\n"
+  "  }\n"
+  "  properties {\n"
+  "    id: \"screen_id\"\n"
+  "    value: \"child\"\n"
+  "    type: PROPERTY_TYPE_HASH\n"
+  "  }\n"
+  "  properties {\n"
+  "    id: \"popup\"\n"
+  "    value: \"true\"\n"
+  "    type: PROPERTY_TYPE_BOOLEAN\n"
+  "  }\n"
+  "}\n"
+  "embedded_components {\n"
+  "  id: \"collectionproxy\"\n"
+  "  type: \"collectionproxy\"\n"
+  "  data: \"collection: \\\"/test/data/child.collection\\\"\\n"
+  "exclude: false\\n"
+  "\"\n"
+  "  position {\n"
+  "    x: 0.0\n"
+  "    y: 0.0\n"
+  "    z: 0.0\n"
+  "  }\n"
+  "  rotation {\n"
+  "    x: 0.0\n"
+  "    y: 0.0\n"
+  "    z: 0.0\n"
+  "    w: 1.0\n"
+  "  }\n"
+  "}\n"
+  ""
+  position {
+    x: 0.0
+    y: 0.0
+    z: 0.0
+  }
+  rotation {
+    x: 0.0
+    y: 0.0
+    z: 0.0
+    w: 1.0
+  }
+  scale3 {
+    x: 1.0
+    y: 1.0
+    z: 1.0
+  }
+}

test/data/screen2.gui_script

@@ -7,6 +7,7 @@ function final(self)
 end
 
 function on_message(self, message_id, message, sender)
-	-- Add message-handling code here
-	-- Remove this function if not needed
+	if message_id == hash("foobar") then
+		_G.screen2_foobar = message or true
+	end
 end

test/data/screens.collection

@@ -21,6 +21,11 @@ embedded_instances {
   "    value: \"screen1\"\n"
   "    type: PROPERTY_TYPE_HASH\n"
   "  }\n"
+  "  properties {\n"
+  "    id: \"receiver_url\"\n"
+  "    value: \"screen1:/go\"\n"
+  "    type: PROPERTY_TYPE_URL\n"
+  "  }\n"
   "}\n"
   "embedded_components {\n"
   "  id: \"collectionproxy\"\n"

test/msg.lua

@@ -8,9 +8,25 @@ local recipients = {}
 
 local history = {}
 
+local function url_to_key(url)
+	if type(url) == "string" then
+		url = msg.url(url)
+	end
+	local ok, err = pcall(function() return url.socket end)
+	if not ok then
+		return url
+	end
+	if url.socket then
+		return hash_to_hex(url.socket or hash("")) ..  hash_to_hex(url.path or hash("")) ..  hash_to_hex(url.fragment or hash(""))
+	else
+		return url
+	end
+end
+
 local function get_recipient(url)
-	recipients[url] = recipients[url] or {}
-	return recipients[url]
+	local key = url_to_key(url)
+	recipients[key] = recipients[key] or {}
+	return recipients[key]
 end
 
 local function post(url, message_id, message)

test/test.collection

@@ -17,21 +17,6 @@ embedded_instances {
   "    w: 1.0\n"
   "  }\n"
   "}\n"
-  "components {\n"
-  "  id: \"cowait\"\n"
-  "  component: \"/test/cowait.script\"\n"
-  "  position {\n"
-  "    x: 0.0\n"
-  "    y: 0.0\n"
-  "    z: 0.0\n"
-  "  }\n"
-  "  rotation {\n"
-  "    x: 0.0\n"
-  "    y: 0.0\n"
-  "    z: 0.0\n"
-  "    w: 1.0\n"
-  "  }\n"
-  "}\n"
   "embedded_components {\n"
   "  id: \"screensfactory\"\n"
   "  type: \"collectionfactory\"\n"

test/test.script

@@ -1,12 +1,16 @@
 local deftest = require "deftest.deftest"
 
 local test_monarch = require "test.test_monarch"
+local test_callback_tracker = require "test.test_callback_tracker"
+local test_transitions = require "test.test_transitions"
 
 
 function init(self)
 	deftest.add(test_monarch)
+	deftest.add(test_callback_tracker)
+	deftest.add(test_transitions)
 	deftest.run({ 
 		coverage = { enabled = true },
-		--pattern = "preload",
+		pattern = "",
 	})
 end

test/test_callback_tracker.lua

@@ -0,0 +1,69 @@
+local unload = require "deftest.util.unload"
+local cowat = require "test.cowait"
+local callback_tracker = require "monarch.utils.callback_tracker"
+
+return function()
+
+	describe("callback tracker", function()
+		before(function()
+			callback_tracker = require "monarch.utils.callback_tracker"
+		end)
+
+		after(function()
+			unload.unload("monarch%..*")
+		end)
+
+
+		it("should be able to tell when all callbacks are done", function()
+			local tracker = callback_tracker.create()
+			local t1 = tracker.track()
+			local t2 = tracker.track()
+
+			local done = false
+			tracker.when_done(function() done = true end)
+			
+			assert(not done, "It should not be done yet - No callback has completed")
+			t1()
+			assert(not done, "It should not be done yet - Only one callback has completed")
+			t2()
+			assert(done, "It should be done now - All callbacks have completed")
+		end)
+
+		it("should indicate if a tracked callback has been invoked more than once", function()
+			local tracker = callback_tracker.create()
+			local t = tracker.track()
+			local ok, err = t()
+			assert(ok == true and err == nil, "It should return true when successful")
+			ok, err = t()
+			assert(ok == false and err, "It should return false and a message when invoked multiple times")
+		end)
+
+		it("should not be possible to track the same callback more than one time", function()
+			local tracker = callback_tracker.create()
+			local t1 = tracker.track()
+			local t2 = tracker.track()
+
+			local done = false
+			tracker.when_done(function() done = true end)
+
+			assert(not done, "It should not be done yet - No callback has completed")
+			t1()
+			t1()
+			assert(not done, "It should not be done yet - Even if one callback has been invoked twice")
+			t2()
+			assert(done, "It should be done now - All callbacks have completed")
+		end)
+
+		it("should handle when callbacks are done before calling when_done()", function()
+			local tracker = callback_tracker.create()
+			local t1 = tracker.track()
+			local t2 = tracker.track()
+			t1()
+			t2()
+
+			local done = false
+			tracker.when_done(function() done = true end)
+			assert(done, "It should be done now - All callbacks have completed")
+		end)
+	end)
+end

test/test_monarch.lua

@@ -6,6 +6,7 @@ local monarch = require "monarch.monarch"
 local SCREEN1_STR = hash("screen1")
 local SCREEN1 = hash(SCREEN1_STR)
 local SCREEN2 = hash("screen2")
+local CHILD = hash("child")
 local SCREEN_PRELOAD = hash("screen_preload")
 local FOCUS1 = hash("focus1")
 local BACKGROUND = hash("background")
@@ -14,6 +15,26 @@ local POPUP2 = hash("popup2")
 local FOOBAR = hash("foobar")
 local TRANSITION1 = hash("transition1")
 
+local function check_stack(expected_screens)
+	local actual_screens = monarch.get_stack()
+	if #actual_screens ~= #expected_screens then
+		return false, "Stack length mismatch"
+	end
+	for i=1,#actual_screens do
+		if actual_screens[i] ~= expected_screens[i] then
+			return false, "Stack content not matching"
+		end
+	end
+	return true
+end
+
+local telescope = require "deftest.telescope"
+telescope.make_assertion(
+	"stack",
+	function(_, ...) return telescope.assertion_message_prefix .. "stack to match" end,
+	function(expected_screens) return check_stack(expected_screens) end
+)
+
 return function()
 
 	local screens_instances = {}
@@ -26,22 +47,20 @@ return function()
 		return not monarch.is_visible(screen_id)
 	end
 
+	local function is_preloading(screen_id)
+		return monarch.is_preloading(screen_id)
+	end
+
 	local function wait_timeout(fn, ...)
 		local args = { ... }
-		local time = socket.gettime()
-		cowait(function()
-			return fn(unpack(args)) or socket.gettime() > time + 5	
-		end)
+		cowait(function() return fn(unpack(args)) end, 5)
 		return fn(...)
 	end
 
 	local function wait_until_done(fn)
-		local is_done = false
-		local function done()
-			is_done = true
-		end
-		fn(done)
-		wait_timeout(function() return is_done end)
+		local done = false
+		fn(function() done = true end)
+		wait_timeout(function() return done end)
 	end
 	local function wait_until_visible(screen_id)
 		return wait_timeout(is_visible, screen_id)
@@ -52,22 +71,17 @@ return function()
 	local function wait_until_hidden(screen_id)
 		return wait_timeout(is_hidden, screen_id)
 	end
+	local function wait_until_preloading(screen_id)
+		return wait_timeout(is_preloading, screen_id)
+	end
 	local function wait_until_not_busy()
 		return wait_timeout(function() return not monarch.is_busy() end)
 	end
-
-	local function assert_stack(expected_screens)
-		local actual_screens = monarch.get_stack()
-		if #actual_screens ~= #expected_screens then
-			error("Stack length mismatch", 2)
+	local function wait_until_loaded(screen_id)
+		wait_until_done(function(done)
+			monarch.when_preloaded(screen_id, done)
+		end)
 	end
-		for i=1,#actual_screens do
-			if actual_screens[i] ~= expected_screens[i] then
-				error("Stack content not matching", 2)
-			end
-		end
-	end
-
 		
 	describe("monarch", function()
 		before(function()
@@ -78,6 +92,7 @@ return function()
 		end)
 
 		after(function()
+			print("[TEST] done")
 			while #monarch.get_stack() > 0 do
 				monarch.back()
 				wait_until_not_busy()
@@ -118,6 +133,22 @@ return function()
 			assert_stack({ })
 		end)
 
+		it("should be able to replace screens at the top of the stack", function()
+			monarch.show(SCREEN1_STR)
+			assert(wait_until_shown(SCREEN1), "Screen1 was never shown")
+			assert_stack({ SCREEN1 })
+
+			monarch.show(SCREEN2)
+			assert(wait_until_hidden(SCREEN1), "Screen1 was never hidden")
+			assert(wait_until_shown(SCREEN2), "Screen2 was never shown")
+			assert_stack({ SCREEN1, SCREEN2 })
+
+			monarch.replace(SCREEN1)
+			assert(wait_until_hidden(SCREEN2), "Screen2 was never hidden")
+			assert(wait_until_shown(SCREEN1), "Screen1 was never shown")
+			assert_stack({ SCREEN1, SCREEN1 })
+		end)
+
 		it("should be able to tell if a screen is visible or not", function()
 			assert(not monarch.is_visible(SCREEN1))
 			monarch.show(SCREEN1)
@@ -177,7 +208,7 @@ return function()
 			assert_stack({ SCREEN1 })
 		end)
 
-		it("should be able to pass data to a screen when showning it or going back to it", function()
+		it("should be able to pass data to a screen when showing it or going back to it", function()
 			local data1 = { foo = "bar" }
 			monarch.show(SCREEN1, nil, data1)
 			assert(wait_until_shown(SCREEN1), "Screen1 was never shown")
@@ -191,7 +222,7 @@ return function()
 
 			local data_back = { going = "back" }
 			monarch.back(data_back)
-			assert_stack({ SCREEN1 })
+			assert(wait_until_shown(SCREEN1))
 
 			assert(monarch.data(SCREEN1) == data_back, "Expected data on screen1 doesn't match actual data")
 		end)
@@ -234,19 +265,28 @@ return function()
 
 
 		it("should prevent further operations while hiding/showing a screen", function()
-			assert(monarch.show(SCREEN1) == true)
-			assert(monarch.show(SCREEN2) == false)
+			monarch.show(SCREEN1)
+			monarch.show(SCREEN2)
 			assert(wait_until_shown(SCREEN1), "Screen1 was never shown")
-			assert_stack({ SCREEN1 })
-
-			assert(monarch.show(SCREEN2) == true)
 			assert(wait_until_shown(SCREEN2), "Screen2 was never shown")
 			assert_stack({ SCREEN1, SCREEN2 })
 
-			assert(monarch.back() == true)
-			assert(monarch.back() == false)
-			assert(wait_until_shown(SCREEN1), "Screen1 was never shown")
-			assert_stack({ SCREEN1 })
+			assert(monarch.back())
+			assert(monarch.back())
+			assert(wait_until_hidden(SCREEN1), "Screen1 was never hidden")
+			assert(wait_until_hidden(SCREEN2), "Screen2 was never hidden")
+		end)
+
+
+		it("should not perform further operations if an operation fails", function()
+			monarch.show(SCREEN2) -- SCREEN2 contains CHILD
+			wait_until_not_busy()
+			assert_stack({ SCREEN2 })
+			monarch.back() -- this will unload SCREEN2 and CHILD
+			monarch.show(CHILD) -- this will fail since CHILD has been unloaded
+			monarch.show(SCREEN1) -- this should be ignored
+			wait_until_not_busy()
+			assert_stack({ })
 		end)
 				
 		
@@ -278,6 +318,59 @@ return function()
 			assert_stack({ SCREEN1, SCREEN2 })
 		end)
 
+		it("should close any open popups when replacing a non-popup", function()
+			monarch.show(SCREEN1)
+			assert(wait_until_shown(SCREEN1), "Screen1 was never shown")
+			assert_stack({ SCREEN1 })
+			monarch.show(POPUP1)
+			assert(wait_until_shown(POPUP1), "Popup1 was never shown")
+			assert_stack({ SCREEN1, POPUP1 })
+			monarch.show(POPUP2)
+			assert(wait_until_shown(POPUP2), "Popup2 was never shown")
+			assert_stack({ SCREEN1, POPUP1, POPUP2 })
+			monarch.replace(SCREEN2)
+			assert(wait_until_shown(SCREEN2), "Screen2 was never shown")
+			assert_stack({ SCREEN2 })
+		end)
+
+		it("should replace a popup", function()
+			monarch.show(SCREEN1)
+			assert(wait_until_shown(SCREEN1), "Screen1 was never shown")
+			assert_stack({ SCREEN1 })
+			monarch.show(POPUP1)
+			assert(wait_until_shown(POPUP1), "Popup1 was never shown")
+			assert_stack({ SCREEN1, POPUP1 })
+			monarch.replace(POPUP2)
+			assert(wait_until_shown(POPUP2), "Popup2 was never shown")
+			assert_stack({ SCREEN1, POPUP2 })
+		end)
+
+		it("should replace a pop-up two levels down", function()
+			monarch.show(SCREEN1)
+			assert(wait_until_shown(SCREEN1), "Screen1 was never shown")
+			assert_stack({ SCREEN1 })
+			monarch.show(POPUP1)
+			assert(wait_until_shown(POPUP1), "Popup1 was never shown")
+			assert_stack({ SCREEN1, POPUP1 })
+			monarch.show(POPUP2)
+			assert(wait_until_shown(POPUP2), "Popup2 was never shown")
+			assert_stack({ SCREEN1, POPUP1, POPUP2 })
+			monarch.show(POPUP2, { pop = 2 })
+			assert(wait_until_shown(POPUP2), "Popup2 was never shown")
+			assert_stack({ SCREEN1, POPUP2 })
+		end)
+
+		it("shouldn't over-pop popups", function()
+			monarch.show(SCREEN1)
+			assert(wait_until_shown(SCREEN1), "Screen1 was never shown")
+			assert_stack({ SCREEN1 })
+			monarch.show(POPUP1)
+			assert(wait_until_shown(POPUP1), "Popup1 was never shown")
+			assert_stack({ SCREEN1, POPUP1 })
+			monarch.show(POPUP2, { pop = 10 })
+			assert(wait_until_shown(POPUP2), "Popup2 was never shown")
+			assert_stack({ SCREEN1, POPUP2 })
+		end)
 
 		it("should be able to get the id of the screen at the top and bottom of the stack", function()
 			assert(monarch.top() == nil)
@@ -314,7 +407,6 @@ return function()
 		it("should be able to preload a screen and wait for it", function()
 			assert(not monarch.is_preloading(TRANSITION1))
 			monarch.preload(TRANSITION1)
-			assert(monarch.is_preloading(TRANSITION1))
 			wait_until_done(function(done)
 				monarch.when_preloaded(TRANSITION1, done)
 			end)
@@ -370,31 +462,25 @@ return function()
 			assert(mock_msg.messages(URL1)[7].message.screen == SCREEN2)
 			assert(mock_msg.messages(URL1)[8].message_id == monarch.SCREEN_TRANSITION_IN_STARTED)
 			assert(mock_msg.messages(URL1)[8].message.screen == SCREEN1)
-			assert(mock_msg.messages(URL1)[9].message_id == monarch.SCREEN_TRANSITION_OUT_FINISHED)
-			assert(mock_msg.messages(URL1)[9].message.screen == SCREEN2)
-			assert(mock_msg.messages(URL1)[10].message_id == monarch.SCREEN_TRANSITION_IN_FINISHED)
-			assert(mock_msg.messages(URL1)[10].message.screen == SCREEN1)
+			assert(mock_msg.messages(URL1)[9].message_id == monarch.SCREEN_TRANSITION_IN_FINISHED)
+			assert(mock_msg.messages(URL1)[9].message.screen == SCREEN1)
+			assert(mock_msg.messages(URL1)[10].message_id == monarch.SCREEN_TRANSITION_OUT_FINISHED)
+			assert(mock_msg.messages(URL1)[10].message.screen == SCREEN2)
 		end)
 
 		it("should be able to show a screen even while it is preloading", function()
-			assert(monarch.is_preloading(SCREEN_PRELOAD))
 			monarch.show(SCREEN_PRELOAD, nil, { count = 1 })
 			assert(wait_until_shown(SCREEN_PRELOAD), "Screen_preload was never shown")
 		end)
 		
 		it("should be able to preload a screen and always keep it loaded", function()
-			monarch.show(SCREEN_PRELOAD, nil, { count = 1 })
+			monarch.show(SCREEN_PRELOAD)
 			assert(wait_until_shown(SCREEN_PRELOAD), "Screen_preload was never shown")
-			-- first time the screen gets loaded it will increment the count
-			assert(monarch.data(SCREEN_PRELOAD).count == 2)
-
-			monarch.show(SCREEN_PRELOAD, { clear = true }, { count = 1 })
-			assert(wait_until_shown(SCREEN_PRELOAD), "Screen_preload was never shown")
-			-- second time the screen gets shown it will already be loaded and not increment the count
-			assert(monarch.data(SCREEN_PRELOAD).count == 1)
+			monarch.back()
+			assert(wait_until_hidden(SCREEN_PRELOAD), "Screen_preload was never hidden")
+			assert(monarch.is_preloaded(SCREEN_PRELOAD))
 		end)
 
-
 		it("should be able to reload a preloaded screen", function()
 			monarch.show(SCREEN_PRELOAD, nil, { count = 1 })
 			assert(wait_until_shown(SCREEN_PRELOAD), "Screen_preload was never shown")
@@ -422,5 +508,69 @@ return function()
 			assert(wait_until_hidden(FOCUS1), "Focus1 was never hidden")
 			assert(_G.focus1_lost)
 		end)
+
+
+		it("should be able to post messages without message data to visible screens", function()
+			_G.screen1_foobar = nil
+			_G.screen2_foobar = nil
+
+			-- proxy screen
+			monarch.show(SCREEN1)
+			wait_until_shown(SCREEN1)
+			assert(monarch.post(SCREEN1, "foobar"), "Expected monarch.post() to return true")
+			cowait(0.1)
+			assert(_G.screen1_foobar, "Screen1 never received a message")
+
+			-- factory screen
+			monarch.show(SCREEN2)
+			wait_until_shown(SCREEN2)
+			assert(monarch.post(SCREEN2, "foobar"), "Expected monarch.post() to return true")
+			cowait(0.1)
+			assert(_G.screen2_foobar, "Screen2 never received a message")
+		end)
+
+
+		it("should be able to post messages with message data to visible screens", function()
+			_G.screen1_foobar = nil
+			_G.screen2_foobar = nil
+
+			-- proxy screen
+			monarch.show(SCREEN1)
+			wait_until_shown(SCREEN1)
+			assert(monarch.post(SCREEN1, "foobar", { foo = "bar" }), "Expected monarch.post() to return true")
+			cowait(0.1)
+			assert(_G.screen1_foobar, "Screen1 never received a message")
+			assert(_G.screen1_foobar.foo == "bar", "Screen1 never received message data")
+			
+			-- factory screen
+			monarch.show(SCREEN2)
+			wait_until_shown(SCREEN2)
+			assert(monarch.post(SCREEN2, "foobar", { foo = "bar" }), "Expected monarch.post() to return true")
+			cowait(0.1)
+			assert(_G.screen2_foobar, "Screen2 never received a message")
+			assert(_G.screen2_foobar.foo == "bar", "Screen2 never received message data")
+		end)
+
+
+		it("should not be able to post messages to hidden screens", function()
+			_G.screen1_foobar = nil
+
+			monarch.show(SCREEN1)
+			wait_until_shown(SCREEN1)
+			monarch.show(SCREEN2)
+			wait_until_shown(SCREEN2)
+			local ok, err = monarch.post(SCREEN1, "foobar")
+			assert(not ok and err, "Expected monarch.post() to return false plus an error message")
+			cowait(0.1)
+			assert(not _G.screen1_foobar, "Screen1 should not have received a message")
+		end)
+
+
+		it("should not be able to post messages to proxy screens without a receiver url", function()
+			monarch.show(POPUP1)
+			wait_until_shown(POPUP1)
+			local ok, err = monarch.post(POPUP1, "foobar")
+			assert(not ok and err, "Expected monarch.post() to return false plus an error message")
+		end)
 	end)
 end

test/test_transitions.lua

@@ -0,0 +1,46 @@
+local cowait = require "test.cowait"
+local mock_msg = require "test.msg"
+local mock_gui = require "deftest.mock.gui"
+local unload = require "deftest.util.unload"
+local monarch = require "monarch.monarch"
+local transitions = require "monarch.transitions.gui"
+local easing = require "monarch.transitions.easings"
+
+return function()
+
+describe("transitions", function()
+	before(function()
+		mock_msg.mock()
+		mock_gui.mock()
+		transitions = require "monarch.transitions.gui"
+	end)
+
+	after(function()
+		mock_msg.unmock()
+		mock_gui.unmock()
+		unload.unload("monarch%..*")
+	end)
+
+
+	it("should replay and immediately finish on layout change", function()
+		function dummy_transition(node, to, easing, duration, delay, cb)
+			print("dummy transition")
+		end
+
+		local node = gui.new_box_node(vmath.vector3(), vmath.vector3(100, 100, 0))
+		local duration = 2
+		local t = transitions.create(node)
+		.show_in(dummy_transition, easing.OUT, duration, delay or 0)
+		.show_out(dummy_transition, easing.IN, duration, delay or 0)
+		.back_in(dummy_transition, easing.OUT, duration, delay or 0)
+		.back_out(dummy_transition, easing.IN, duration, delay or 0)
+
+		t.handle(monarch.TRANSITION.SHOW_IN)
+		t.handle(hash("layout_changed"))
+		local messages = mock_msg.messages(msg.url())
+		assert(#messages == 1, "Expected one message to have been received")
+		assert(messages[1].message_id == monarch.TRANSITION.DONE, "Expected a TRANSITION.DONE message")
+	end)
+end)
+
+end