the add button works!

assets/editors/layouts/stage/spriteEditScreen.xml

@@ -76,12 +76,12 @@
 			setEx("highMemory", highMemoryRadio.checked);
 			setEx("lowMemory", lowMemoryRadio.checked);
 
-			sprite.x = xStepper.value;
-			sprite.y = yStepper.value;
-			sprite.zoomFactor = zoomFactorStepper.value;
-			sprite.antialiasing = antialiasingCheckbox.checked;
+			//sprite.x = xStepper.value;
+			//sprite.y = yStepper.value;
+			//sprite.zoomFactor = zoomFactorStepper.value;
+			//sprite.antialiasing = antialiasingCheckbox.checked;
 			//sprite.color = colorWheel.color;
-			sprite.spriteAnimType = animType.value;
+			//sprite.spriteAnimType = animType.value;
 			sprite.angle = angleStepper.value;
 
 			function saveXY(obj:Dynamic, name:String, x:UINumericStepper, y:UINumericStepper) {
@@ -112,6 +112,7 @@
 			saveXY(sprite.scrollFactor, "scroll", scrollXStepper, scrollYStepper);
 			saveXY(sprite.scale, "scale", scaleXStepper, scaleYStepper);
 			saveXY(sprite.skew, "skew", skewXStepper, skewYStepper);
+			XMLUtil.loadSpriteFromXML(sprite, data.xml, stage.spritesParentFolder);
 		}
 	</exec>
 </window>

source/funkin/editors/stage/StageEditor.hx

@@ -261,7 +261,27 @@ class StageEditor extends UIState {
 			members.insert(newID, sprite);
 		}
 		stageSpritesWindow.addButton.callback = () -> {
-			// TODO: implement this
+			var node:Access = new Access(Xml.createElement("sprite"));
+			stage.stageXML.x.addChild(node.x);
+			node.att.name = "sprite_" + stageSpritesWindow.buttons.length;
+
+			var sprite:FunkinSprite = new FunkinSprite();
+			add(sprite);
+			sprite.extra.set(exID("node"), node);
+			sprite.extra.set(exID("type"), node.name);
+			sprite.extra.set(exID("imageFile"), '');
+			sprite.extra.set(exID("parentNode"), stage.stageXML.x);
+			sprite.extra.set(exID("highMemory"), false);
+			sprite.extra.set(exID("lowMemory"), false);
+			xmlMap.set(sprite, node);
+
+			var button:StageElementButton = new StageSpriteButton(0, 0, sprite, node);
+			sprite.extra.set(exID("button"), button);
+			stageSpritesWindow.add(button);
+
+			var substate = new StageSpriteEditScreen(button);
+			substate.newSprite = true;
+			openSubState(substate);
 		}
 		for (i=>sprite in order) {
 			var xml = xmlMap.get(sprite);

source/funkin/editors/stage/StageSpriteEditScreen.hx

@@ -7,8 +7,10 @@ using StringTools;
 
 
 class StageSpriteEditScreen extends UISoftcodedWindow {
+	public var newSprite:Bool = false;
 	public var data:StageElementButton;
 	public var sprite:FunkinSprite;
+	var isSaving:Bool = false;
 
 	public function new(data:StageElementButton) {
 		this.data = data;
@@ -32,7 +34,16 @@ class StageSpriteEditScreen extends UISoftcodedWindow {
 	}
 
 	public override function saveData() {
+		isSaving = true;
 		super.saveData();
 		data.updateInfo(sprite);
 	}
+
+	public override function close() {
+		if (!isSaving && newSprite) {
+			data.onDelete();
+			trace("deleting sprite");
+		}
+		super.close();
+	}
 }

source/funkin/editors/ui/UIButtonList.hx

@@ -48,7 +48,7 @@ class UIButtonList<T:UIButton> extends UIWindow {
 	}
 
 	public inline function add(button:T) {
-		button.ID = buttons.members.length-1;
+		button.ID = buttons.members.length;
 		buttons.add(button);
 		curMovingInterval = 0;
 		nextscrollY += button.bHeight;