On Demand Resources demo

Readme.md

This demo adds On Demand Resource capabilities to Corona Cannon project. It would download all images used in project displaying loading screen with progress bar.

# Clone some CoronaCannon
git clone git@github.com:coronalabs-samples/CoronaCannon.git

cd CoronaCannon

# Apply On-Demand Resources patch
curl https://gist.githubusercontent.com/Shchvova/c4884457e5b71b24349a3247e6bcc78e/raw/patch.diff | git apply -

patch.diff

From e1ba9cc9e544e3376645033134882de82a91488d Mon Sep 17 00:00:00 2001
From: Vlad Shcherban <vlad@coronalabs.com>
Date: Wed, 14 Dec 2016 11:19:52 -0500
Subject: [PATCH] On Demand Resource loading

---
 build.settings |  7 +++++-
 main.lua       |  9 +++++--
 scenes/odr.lua | 75 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
 3 files changed, 88 insertions(+), 3 deletions(-)
 create mode 100644 scenes/odr.lua

diff --git a/build.settings b/build.settings
index 868da40..e73bb58 100755
--- a/build.settings
+++ b/build.settings
@@ -45,6 +45,10 @@ settings = {
     },
     tvos = {
         iCloud = true,
+        onDemandResources =
+        {
+           { tag="resources", resource="images" },
+        },
         icon = {
             small = { -- A collection of 400x240 images, in order from top to bottom
                 'Icon-tvOS-Small-4.png',
@@ -79,7 +83,8 @@ settings = {
     },
     plugins = {
         ['plugin.iCloud'] = {publisherId = 'com.coronalabs', supportedPlatforms = {iphone = true, appletvos = true, ['iphone-sim'] = true, osx = true}},
-        ['plugin.bit'] = {publisherId = 'com.coronalabs'} -- Needed for Tiled loader
+        ['plugin.bit'] = {publisherId = 'com.coronalabs'}, -- Needed for Tiled loader
+        ["plugin.onDemandResources"] = { publisherId = "com.coronalabs", supportedPlatforms = { appletvos = true } },
     },
     excludeFiles = {
         all = {
diff --git a/main.lua b/main.lua
index 3d5d236..570ff06 100644
--- a/main.lua
+++ b/main.lua
@@ -93,5 +93,10 @@ require('libs.relayout')
 local overscan = require('libs.overscan')
 overscan.compensate(databox.overscanValue)
 
--- Show menu scene
-composer.gotoScene('scenes.menu')
+if system.getInfo('platform') == 'tvos' then
+	-- download OnDemandResources
+	composer.gotoScene('scenes.odr')
+else
+	-- Show menu scene
+	composer.gotoScene('scenes.menu')
+end
diff --git a/scenes/odr.lua b/scenes/odr.lua
new file mode 100644
index 0000000..3287429
--- /dev/null
+++ b/scenes/odr.lua
@@ -0,0 +1,75 @@
+
+local composer = require('composer')
+local widget = require('widget')
+local relayout = require("libs.relayout")
+local odr = require("plugin.onDemandResources")
+local json = require("json")
+
+local scene = composer.newScene()
+
+local tag = "resources"
+
+function scene:create()
+
+end
+
+local progress = nil
+
+local function downloadODResources()
+	local _W, _H, _CX, _CY = relayout._W, relayout._H, relayout._CX, relayout._CY
+	local group = scene.view
+	progress = widget.newProgressView( {
+			x = _CX,
+			y = _CY,
+			width = _W*0.7,
+			isAnimated = false,
+		} )
+
+	progress:setProgress( 0 )
+
+
+	local function progressUpdater ( event )
+	    progress:setProgress( odr.progress(tag) or 0 )
+	end
+	Runtime:addEventListener( "enterFrame", progressUpdater )
+
+	odr.request(tag, true, function( event2 )
+		Runtime:removeEventListener( "enterFrame", progressUpdater )
+		progress:removeSelf( )
+		progress = nil
+		if event2.isError then
+			display.newText( "Error downloading ODR", _CX, _CY, nil, _CY/12 )
+		else
+			composer.gotoScene('scenes.menu')
+		end
+	end)
+	odr.setDownloadPriority(tag, "urgent")
+
+end
+
+function scene:show(event)
+	if event.phase == 'did' then
+		odr.request(tag, false, function( event )
+			if event.isError then
+				downloadODResources()
+			else
+				composer.gotoScene('scenes.menu')
+			end
+		end)
+	end
+end
+
+function scene:hide(event)
+	if event.phase == 'did' then
+		if progress then
+			progress:removeSelf( )
+			progress = nil
+		end
+	end
+end
+
+scene:addEventListener('create')
+scene:addEventListener('show')
+scene:addEventListener('hide')
+
+return scene
-- 
2.8.1