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using System;
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using System.Collections.Generic;
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using System.Linq;
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using System.Text;
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using System.Threading;
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namespace Implab
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{
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/// <summary>
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/// This class allows to interact with asyncronuos task.
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/// </summary>
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/// <remarks>
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/// Members of this object are thread safe.
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/// </remarks>
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public class TaskController: IProgressNotifier, ITaskController
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{
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readonly object m_lock;
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string m_message;
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float m_current;
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float m_max;
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bool m_cancelled;
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public event EventHandler Cancelled;
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public event EventHandler<ValueEventArgs<string>> MessageUpdated;
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public event EventHandler<ValueEventArgs<float>> ProgressUpdated;
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public event EventHandler<ProgressInitEventArgs> ProgressInit;
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public TaskController()
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{
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m_lock = new Object();
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}
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public string Message
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{
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get
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{
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lock (m_lock)
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return m_message;
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}
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set
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{
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lock (m_lock)
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{
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m_message = value;
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OnMessageUpdated();
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}
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}
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}
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public float CurrentProgress
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{
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get
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{
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lock (m_lock)
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return m_current;
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}
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set
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{
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lock (m_lock)
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{
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var prev = m_current;
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m_current = value;
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if (m_current >= m_max)
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m_current = m_max;
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if (m_current != prev)
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OnProgressUpdated();
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}
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}
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}
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public void InitProgress(float current, float max, string message)
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{
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if (max < 0)
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throw new ArgumentOutOfRangeException("max");
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if (current < 0 || current > max)
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throw new ArgumentOutOfRangeException("current");
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lock(m_lock) {
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m_current = current;
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m_max = max;
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m_message = message;
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OnProgressInit();
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}
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}
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public bool IsCancelled {
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get {
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lock (m_lock)
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return m_cancelled;
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}
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}
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public void Cancel() {
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lock (m_lock) {
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if (!m_cancelled)
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m_cancelled = true;
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}
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}
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public void Cancel(Exception reason) {
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lock (m_lock) {
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if (!m_cancelled)
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m_cancelled = true;
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}
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}
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protected virtual void OnCancelled() {
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var temp = Cancelled;
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if (temp != null) {
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temp(this,new EventArgs());
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}
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}
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protected virtual void OnMessageUpdated()
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{
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var temp = MessageUpdated;
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if (temp != null)
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{
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temp(this, new ValueEventArgs<string>(m_message));
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}
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}
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protected virtual void OnProgressUpdated()
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{
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var temp = ProgressUpdated;
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if (temp != null)
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{
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temp(this,new ValueEventArgs<float>(m_current));
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}
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}
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protected virtual void OnProgressInit()
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{
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var temp = ProgressInit;
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if (temp != null)
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{
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temp(this, new ProgressInitEventArgs(m_current,m_max, m_message));
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}
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}
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}
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}
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