Refactor using better Godot and JavaScript API and add an example

README.md

@@ -1 +1,8 @@
 # HTML5 File Exchange for Godot 3.2
+
+## Usage
+
+* Copy addons to your project.
+* Enable the plugin. (A `HTML5File` singleton should be added into autoload list).
+* Add a HTML5 export item to enable HTML5 debugging option.
+* Check sample.tscn for usage.

addons/HTML5FileExchange/HTML5FileExchange.gd

@@ -1,24 +1,21 @@
 extends Node
 
-signal InFocus
+signal read_completed
+signal load_completed(image)
+
+var js_callback = JavaScript.create_callback(self, "load_handler");
+var js_interface;
 
 func _ready():
 	if OS.get_name() == "HTML5" and OS.has_feature('JavaScript'):
 		_define_js()
-
-
-func _notification(notification:int) -> void:
-	if notification == MainLoop.NOTIFICATION_WM_FOCUS_IN:
-		emit_signal("InFocus")
+		js_interface = JavaScript.get_interface("_HTML5FileExchange");
 
 func _define_js()->void:
 	#Define JS script
 	JavaScript.eval("""
-	var fileData;
-	var fileType;
-	var fileName;
-	var canceled;
-	function upload() {
+	var _HTML5FileExchange = {};
+	_HTML5FileExchange.upload = function(gd_callback) {
 		canceled = true;
 		var input = document.createElement('INPUT'); 
 		input.setAttribute("type", "file");
@@ -29,56 +26,32 @@ func _define_js()->void:
 				canceled = false;}
 			var file = event.target.files[0];
 			var reader = new FileReader();
-			fileType = file.type;
-			fileName = file.name;
+			this.fileType = file.type;
+			// var fileName = file.name;
 			reader.readAsArrayBuffer(file);
-			reader.onloadend = function (evt) {
+			reader.onloadend = (evt) => { // Since here's it's arrow function, "this" still refers to _HTML5FileExchange
 				if (evt.target.readyState == FileReader.DONE) {
-					fileData = evt.target.result;
+					this.result = evt.target.result;
+					gd_callback(); // It's hard to retrieve value from callback argument, so it's just for notification
 				}
 			}
 		  });
 	}
-	function download(fileName, byte) {
-		var buffer = Uint8Array.from(byte);
-		var blob = new Blob([buffer], { type: 'image/png'});
-		var link = document.createElement('a');
-		link.href = window.URL.createObjectURL(blob);
-		link.download = fileName;
-		link.click();
-	};
 	""", true)
 
+func load_handler(_args):
+	emit_signal("read_completed")
 	
-func load_image()->Image:
+func load_image():
 	if OS.get_name() != "HTML5" or !OS.has_feature('JavaScript'):
 		return
 
-	#Execute js function
-	JavaScript.eval("upload();", true)	#opens promt for choosing file
+	js_interface.upload(js_callback);
 
-	#label.text = "Wait for focus"
-	yield(self, "InFocus")	#wait until js promt is closed
+	yield(self, "read_completed")
 	
-	#label.text = "Timer on for loading"
-	yield(get_tree().create_timer(0.1), "timeout")	#give some time for async js data load
-	
-	if JavaScript.eval("canceled;", true):	# if File Dialog closed w/o file
-		#label.text = "Canceled prompt"
-		return
-	
-	# use data from png data
-	#label.text = "Load image"
-	var imageData
-	while true:
-		imageData = JavaScript.eval("fileData;", true)
-		if imageData != null:
-			break
-		#label.text = "No image yet"
-		yield(get_tree().create_timer(1.0), "timeout")	#need more time to load data
-	
-	var imageType = JavaScript.eval("fileType;", true)
-	var imageName = JavaScript.eval("fileName;", true)
+	var imageType = js_interface.fileType;
+	var imageData = JavaScript.eval("_HTML5FileExchange.result", true) # interface doesn't work as expected for some reason
 	
 	var image = Image.new()
 	var image_error
@@ -90,39 +63,18 @@ func load_image()->Image:
 		"image/webp":
 			image_error = image.load_webp_from_buffer(imageData)
 		var invalidType:
-			#label.text = "Unsupported file format - %s." % invalidType
+			print("Unsupported file format - %s." % invalidType)
 			return
+	
 	if image_error:
-		#label.text = "An error occurred while trying to display the image."
-		return
-	else:
-		return image
-		# Display texture
-		var tex = ImageTexture.new()
-		tex.create_from_image(image, 0) # Flag = 0 or else export is fucked!
-		Sprite.texture = tex
-		#loadedImage = image # Keep Image for later, just in case...
-		#loadedImageName = imageName
-		#label.text = "Image %s loaded as %s." % [imageName, imageType]
-		return
-	#label.text = "Something went wrong"
+		print("An error occurred while trying to display the image.")
 	
+	emit_signal("load_completed", image)
 
-func save_image(image:Image, fileName:String = "export")->void:
+func save_image(image:Image, fileName:String = "export.png")->void:
 	if OS.get_name() != "HTML5" or !OS.has_feature('JavaScript'):
 		return
 	
 	image.clear_mipmaps()
-	if image.save_png("user://export_temp.png"):
-		#label.text = "Error saving temp file"
-		return
-	var file:File = File.new()
-	if file.open("user://export_temp.png", File.READ):
-		#label.text = "Error opening file"
-		return
-	var pngData = Array(file.get_buffer(file.get_len()))	#read data as PoolByteArray and convert it to Array for JS
-	file.close()
-	var dir = Directory.new()
-	dir.remove("user://export_temp.png")
-	JavaScript.eval("download('%s', %s);" % [fileName, str(pngData)], true)
-	#label.text = "Saving DONE"
+	var buffer = image.save_png_to_buffer()
+	JavaScript.download_buffer(buffer, fileName)

addons/HTML5FileExchange/Sample.gd

@@ -0,0 +1,19 @@
+extends TextureRect
+
+# Called when the node enters the scene tree for the first time.
+func _ready():
+	pass # Replace with function body.
+
+func _on_UploadButton_pressed():
+	HTML5File.load_image()
+
+	var image = yield(HTML5File, "load_completed")
+
+	var tex = ImageTexture.new()
+	tex.create_from_image(image, 0)
+	
+	texture = tex;
+
+func _on_DownloadButton_pressed():
+	var image = texture.get_data()
+	HTML5File.save_image(image, "image.png")

addons/HTML5FileExchange/sample.tscn

@@ -0,0 +1,35 @@
+[gd_scene load_steps=2 format=2]
+
+[ext_resource path="res://addons/HTML5FileExchange/Sample.gd" type="Script" id=1]
+
+[node name="Control" type="Control"]
+anchor_right = 1.0
+anchor_bottom = 1.0
+
+[node name="VBoxContainer" type="VBoxContainer" parent="."]
+margin_right = 40.0
+margin_bottom = 40.0
+
+[node name="HBoxContainer" type="HBoxContainer" parent="VBoxContainer"]
+margin_right = 136.0
+margin_bottom = 20.0
+
+[node name="UploadButton" type="Button" parent="VBoxContainer/HBoxContainer"]
+margin_right = 57.0
+margin_bottom = 20.0
+text = "Upload"
+
+[node name="DownloadButton" type="Button" parent="VBoxContainer/HBoxContainer"]
+margin_left = 61.0
+margin_right = 136.0
+margin_bottom = 20.0
+text = "Download"
+
+[node name="TextureRect" type="TextureRect" parent="VBoxContainer"]
+margin_top = 24.0
+margin_right = 136.0
+margin_bottom = 24.0
+script = ExtResource( 1 )
+
+[connection signal="pressed" from="VBoxContainer/HBoxContainer/UploadButton" to="VBoxContainer/TextureRect" method="_on_UploadButton_pressed"]
+[connection signal="pressed" from="VBoxContainer/HBoxContainer/DownloadButton" to="VBoxContainer/TextureRect" method="_on_DownloadButton_pressed"]

default_env.tres

@@ -0,0 +1,7 @@
+[gd_resource type="Environment" load_steps=2 format=2]
+
+[sub_resource type="ProceduralSky" id=1]
+
+[resource]
+background_mode = 2
+background_sky = SubResource( 1 )

icon.png.import

@@ -0,0 +1,35 @@
+[remap]
+
+importer="texture"
+type="StreamTexture"
+path="res://.import/icon.png-487276ed1e3a0c39cad0279d744ee560.stex"
+metadata={
+"vram_texture": false
+}
+
+[deps]
+
+source_file="res://icon.png"
+dest_files=[ "res://.import/icon.png-487276ed1e3a0c39cad0279d744ee560.stex" ]
+
+[params]
+
+compress/mode=0
+compress/lossy_quality=0.7
+compress/hdr_mode=0
+compress/bptc_ldr=0
+compress/normal_map=0
+flags/repeat=0
+flags/filter=true
+flags/mipmaps=false
+flags/anisotropic=false
+flags/srgb=2
+process/fix_alpha_border=true
+process/premult_alpha=false
+process/HDR_as_SRGB=false
+process/invert_color=false
+process/normal_map_invert_y=false
+stream=false
+size_limit=0
+detect_3d=true
+svg/scale=1.0

project.godot

@@ -0,0 +1,31 @@
+; Engine configuration file.
+; It's best edited using the editor UI and not directly,
+; since the parameters that go here are not all obvious.
+;
+; Format:
+;   [section] ; section goes between []
+;   param=value ; assign values to parameters
+
+config_version=4
+
+[application]
+
+config/name="HTML5-File-Exchange-for-Godot"
+run/main_scene="res://addons/HTML5FileExchange/sample.tscn"
+config/icon="res://icon.png"
+
+[autoload]
+
+HTML5File="*res://addons/HTML5FileExchange/HTML5FileExchange.gd"
+
+[editor_plugins]
+
+enabled=PoolStringArray( "res://addons/HTML5FileExchange/plugin.cfg" )
+
+[physics]
+
+common/enable_pause_aware_picking=true
+
+[rendering]
+
+environment/default_environment="res://default_env.tres"