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using System.Collections.Generic;
using UnityEngine;
using UnityEngine.Events;
namespace LobbyRelaySample.UI
{
/// <summary>
/// Basic UI element that can be shown or hidden.
/// </summary>
[RequireComponent(typeof(CanvasGroup))]
public class UIPanelBase : MonoBehaviour
{
[SerializeField]
private UnityEvent<bool> m_onVisibilityChange;
bool showing;
CanvasGroup m_canvasGroup;
List<UIPanelBase> m_uiPanelsInChildren = new List<UIPanelBase>(); // Otherwise, when this Shows/Hides, the children won't know to update their own visibility.
public void Start()
{
var children = GetComponentsInChildren<UIPanelBase>(true); // Note that this won't detect children in GameObjects added during gameplay, if there were any.
foreach (var child in children)
if (child != this)
m_uiPanelsInChildren.Add(child);
}
protected CanvasGroup MyCanvasGroup
{
get
{
if (m_canvasGroup != null) return m_canvasGroup;
return m_canvasGroup = GetComponent<CanvasGroup>();
}
}
public void Toggle()
{
if (showing)
Hide();
else
Show();
}
public void Show()
{
MyCanvasGroup.alpha = 1;
MyCanvasGroup.interactable = true;
MyCanvasGroup.blocksRaycasts = true;
showing = true;
m_onVisibilityChange?.Invoke(true);
foreach (UIPanelBase child in m_uiPanelsInChildren)
child.m_onVisibilityChange?.Invoke(true);
}
public void Hide()
{
MyCanvasGroup.alpha = 0;
MyCanvasGroup.interactable = false;
MyCanvasGroup.blocksRaycasts = false;
showing = false;
m_onVisibilityChange?.Invoke(false);
foreach (UIPanelBase child in m_uiPanelsInChildren)
child.m_onVisibilityChange?.Invoke(false);
}
}
}