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103 lines
3.9 KiB
103 lines
3.9 KiB
namespace VRTK
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{
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using System.Collections;
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using System.Linq;
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using System.Reflection;
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using UnityEngine.EventSystems;
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public class VRTK_EventSystem : EventSystem
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{
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protected EventSystem previousEventSystem;
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protected VRTK_VRInputModule vrInputModule;
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private static readonly FieldInfo[] EVENT_SYSTEM_FIELD_INFOS = typeof(EventSystem).GetFields(BindingFlags.Public | BindingFlags.Instance);
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private static readonly PropertyInfo[] EVENT_SYSTEM_PROPERTY_INFOS = typeof(EventSystem).GetProperties(BindingFlags.Public | BindingFlags.Instance).Except(new[] { typeof(EventSystem).GetProperty("enabled") }).ToArray();
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private static readonly FieldInfo BASE_INPUT_MODULE_EVENT_SYSTEM_FIELD_INFO = typeof(BaseInputModule).GetField("m_EventSystem", BindingFlags.NonPublic | BindingFlags.Instance);
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protected override void OnEnable()
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{
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previousEventSystem = current;
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if (previousEventSystem != null)
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{
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previousEventSystem.enabled = false;
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CopyValuesFrom(previousEventSystem, this);
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}
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vrInputModule = gameObject.AddComponent<VRTK_VRInputModule>();
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base.OnEnable();
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StartCoroutine(SetEventSystemOfBaseInputModulesAfterFrameDelay(this));
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}
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protected override void OnDisable()
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{
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base.OnDisable();
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Destroy(vrInputModule);
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if (previousEventSystem != null)
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{
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previousEventSystem.enabled = true;
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CopyValuesFrom(this, previousEventSystem);
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SetEventSystemOfBaseInputModules(previousEventSystem);
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}
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}
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protected override void Update()
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{
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base.Update();
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if (current == this)
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{
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vrInputModule.Process();
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}
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}
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#if UNITY_5_5_OR_NEWER
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protected override void OnApplicationFocus(bool hasFocus)
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{
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//Don't call the base implementation because it will set a pause flag for this EventSystem
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}
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#endif
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private static void CopyValuesFrom(EventSystem fromEventSystem, EventSystem toEventSystem)
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{
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foreach (FieldInfo fieldInfo in EVENT_SYSTEM_FIELD_INFOS)
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{
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fieldInfo.SetValue(toEventSystem, fieldInfo.GetValue(fromEventSystem));
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}
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foreach (PropertyInfo propertyInfo in EVENT_SYSTEM_PROPERTY_INFOS)
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{
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if (propertyInfo.CanWrite)
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{
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propertyInfo.SetValue(toEventSystem, propertyInfo.GetValue(fromEventSystem, null), null);
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}
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}
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}
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private static IEnumerator SetEventSystemOfBaseInputModulesAfterFrameDelay(EventSystem eventSystem)
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{
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yield return null;
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SetEventSystemOfBaseInputModules(eventSystem);
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}
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private static void SetEventSystemOfBaseInputModules(EventSystem eventSystem)
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{
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/*
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BaseInputModule has a private field referencing the current EventSystem. That field is set in
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BaseInputModule.OnEnable only. It's used in BaseInputModule.OnEnable and BaseInputModule.OnDisable
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to call EventSystem.UpdateModules.
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This means we could just disable and enable every enabled BaseInputModule to fix that reference.
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But the StandaloneInputModule (which is added by default when adding an EventSystem in the Editor)
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requires EventSystem. Which means we can't correctly destroy the old EventSystem first and then add
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our own one.
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We therefore update that private reference directly here.
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*/
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foreach (BaseInputModule module in FindObjectsOfType<BaseInputModule>())
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{
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BASE_INPUT_MODULE_EVENT_SYSTEM_FIELD_INFO.SetValue(module, eventSystem);
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}
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eventSystem.UpdateModules();
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}
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}
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}
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