113 lines
3.4 KiB
C#
113 lines
3.4 KiB
C#
// Copyright (c) 2012-2021 Wojciech Figat. All rights reserved.
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using System;
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using FlaxEngine;
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namespace FlaxEditor.Progress
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{
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/// <summary>
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/// Base class for all editor handlers used to report actions progress to the user.
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/// </summary>
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public abstract class ProgressHandler
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{
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/// <summary>
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/// Progress handler events delegate.
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/// </summary>
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/// <param name="handler">The calling handler.</param>
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public delegate void ProgressDelegate(ProgressHandler handler);
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private float _progress;
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private bool _isActive;
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private string _infoText;
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/// <summary>
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/// Gets a value indicating whether this handler is active.
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/// </summary>
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public bool IsActive => _isActive;
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/// <summary>
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/// Gets the current progress (normalized to range [0;1]).
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/// </summary>
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public float Progress => _progress;
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/// <summary>
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/// Gets the information text.
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/// </summary>
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public string InfoText => _infoText;
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/// <summary>
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/// Occurs when progress starts (becomes active).
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/// </summary>
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public event ProgressDelegate ProgressStart;
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/// <summary>
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/// Occurs when progress gets changed (or info text changes).
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/// </summary>
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public event ProgressDelegate ProgressChanged;
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/// <summary>
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/// Occurs when progress end (becomes inactive).
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/// </summary>
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public event ProgressDelegate ProgressEnd;
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/// <summary>
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/// Gets a value indicating whether this handler action can be cancelled.
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/// </summary>
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public virtual bool CanBeCanceled => false;
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/// <summary>
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/// Cancels this progress action.
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/// </summary>
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public void Cancel()
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{
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throw new InvalidOperationException("Cannot cancel this progress action.");
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}
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/// <summary>
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/// Called when progress action starts.
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/// </summary>
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protected virtual void OnStart()
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{
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if (_isActive)
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throw new InvalidOperationException("Already started.");
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_isActive = true;
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_progress = 0;
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_infoText = string.Empty;
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ProgressStart?.Invoke(this);
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ProgressChanged?.Invoke(this);
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}
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/// <summary>
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/// Called when progress action gets updated (changed info text or progress value).
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/// </summary>
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/// <param name="progress">The progress (normalized to range [0;1]).</param>
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/// <param name="infoText">The information text.</param>
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protected virtual void OnUpdate(float progress, string infoText)
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{
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progress = Mathf.Saturate(progress);
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if (!Mathf.NearEqual(progress, _progress) || infoText != _infoText)
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{
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_progress = progress;
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_infoText = infoText;
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ProgressChanged?.Invoke(this);
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}
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}
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/// <summary>
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/// Called when progress action ends.
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/// </summary>
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protected virtual void OnEnd()
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{
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if (!_isActive)
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throw new InvalidOperationException("Already ended.");
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_isActive = false;
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_progress = 0;
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_infoText = string.Empty;
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ProgressChanged?.Invoke(this);
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ProgressEnd?.Invoke(this);
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}
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}
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}
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