FSC/Assets/Scripts/Core/UI/Control/UIStackManager.cs

using System.Collections;
using System.Collections.Generic;
using UnityEngine;

public class UIStackManager : MonoBehaviour
{
    public List<UIWindowBase> m_normalStack = new List<UIWindowBase>();
    public List<UIWindowBase> m_fixedStack  = new List<UIWindowBase>();
    public List<UIWindowBase> m_popupStack  = new List<UIWindowBase>();
    public List<UIWindowBase> m_topBarStack = new List<UIWindowBase>();

    public void OnUIOpen(UIWindowBase ui)
    {
        switch (ui.m_UIType)
        {
            case UIType.Fixed: m_fixedStack.Add(ui); break;
            case UIType.Normal: m_normalStack.Add(ui); break;
            case UIType.PopUp: m_popupStack.Add(ui); break;
            case UIType.TopBar: m_topBarStack.Add(ui); break;
        }
    }

    public void OnUIClose(UIWindowBase ui)
    {
        switch (ui.m_UIType)
        {
            case UIType.Fixed: m_fixedStack.Remove(ui); break;
            case UIType.Normal: m_normalStack.Remove(ui); break;
            case UIType.PopUp: m_popupStack.Remove(ui); break;
            case UIType.TopBar: m_topBarStack.Remove(ui); break;
        }
    }

    public void CloseLastUIWindow(UIType uiType = UIType.Normal)
    {
        UIWindowBase ui = GetLastUI(uiType);

        if(ui != null)
        {
            UIManager.CloseUIWindow(ui);
        }
    }

    public UIWindowBase GetLastUI(UIType uiType)
    {
        switch (uiType)
        {
            case UIType.Fixed:
                if (m_fixedStack.Count > 0)
                    return m_fixedStack[m_fixedStack.Count - 1];
                else
                    return null;
            case UIType.Normal:
                if (m_normalStack.Count > 0)
                    return m_normalStack[m_normalStack.Count - 1];
                else
                    return null;
            case UIType.PopUp:
                if (m_popupStack.Count > 0)
                    return m_popupStack[m_popupStack.Count - 1];
                else
                    return null;
            case UIType.TopBar:
                if (m_topBarStack.Count > 0)
                    return m_topBarStack[m_topBarStack.Count - 1];
                else
                    return null;
        }

        throw new System.Exception("CloseLastUIWindow does not support GameUI");
    }
}