using Prism.Mvvm;
using System.ComponentModel;

namespace Store.Management.Framework.Controls;

public abstract class ViewModelBase : BindableBase
{
    private bool hasLoaded;

    internal void NotifyLoaded()
    {
        if (!hasLoaded)
        {
            hasLoaded = true;
            OnLoadedOnce();
        }
        OnLoaded();
    }

    /// <summary>当前实例首次加载时调用，先于 OnLoaded。</summary>
    protected virtual void OnLoadedOnce() { }
    protected internal virtual void OnLoaded() { }
    protected internal virtual void OnUnloaded() { }
    protected internal virtual void OnActivated() { }
    protected internal virtual void OnDeactivated() { }
    protected internal virtual void OnClosing(CancelEventArgs e) { }
    protected internal virtual void OnClosed() { }
}