Initial Commit

Assets/Scripts/UI/WindowDraggingSystem.cs

@@ -0,0 +1,58 @@
+using Markers;
+using UI;
+using Unity.Entities;
+using UnityEngine;
+using Zenject;
+
+namespace Events
+{
+	public class WindowDraggingSystem : ComponentSystem
+	{
+		[Inject] private readonly Camera camera;
+
+		protected override void OnUpdate()
+		{
+			Entities.ForEach(
+				(
+					Entity entity,
+					RectTransform transform,
+					ref EnabledComponentData enabled,
+					ref WindowComponentData window,
+					ref WindowDragEventData e) =>
+				{
+					RectTransformUtility.ScreenPointToLocalPointInRectangle(
+						(RectTransform)transform.parent,
+						Input.mousePosition,
+						camera,
+						out var localMousePos);
+					var mouseDelta = localMousePos - e.LastMousePos;
+					e.LastMousePos = localMousePos;
+
+					transform.anchoredPosition += mouseDelta * 0.5f;
+
+					if (!Input.GetMouseButton(0))
+					{
+						PostUpdateCommands.RemoveComponent<WindowDragEventData>(entity);
+					}
+				});
+
+			Entities.WithAllReadOnly<RectTransform>()
+				.WithNone<WindowDragEventData>()
+				.ForEach(
+					(Entity entity, WindowButtonPropertiesData windowProperties) =>
+					{
+						var transform = EntityManager.GetComponentObject<RectTransform>(entity);
+						if (RectTransformUtility.RectangleContainsScreenPoint(windowProperties.DragArea, Input.mousePosition) &&
+						    Input.GetMouseButton(0))
+						{
+							RectTransformUtility.ScreenPointToLocalPointInRectangle(
+								(RectTransform)transform.parent,
+								Input.mousePosition,
+								camera,
+								out var localMousePos);
+							PostUpdateCommands.AddComponent(entity, new WindowDragEventData { LastMousePos = localMousePos });
+						}
+					});
+		}
+	}
+}