305 lines
9 KiB
C#
305 lines
9 KiB
C#
/*
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Copyright (C) Arnaud Houdelette 2012-2014
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Copyright (C) Emmanuel Langlois 2012-2014
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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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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namespace DMX2
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{
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/// <summary>
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/// Event data : Objet passé aux cibles d'evenements
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/// </summary>
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public struct EventData
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{
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public string id;
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public byte value;
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}
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/// <summary>
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/// Interface pour les fournisseurs d'evenements
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/// </summary>
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public interface IEventProvider
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{
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/// <summary>
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/// Renvoie le nom du sous menu associé au fournisseur d'evenements.
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/// </summary>
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/// <value>
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/// Le nom du menu.
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/// </value>
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string MenuName{ get; }
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/// <summary>Demande au fournisseur de signaler l'evenement spécifié</summary>
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/// <param name='eventId'>L'id de l'evenement.</param>
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/// <returns><c>true</c> si le fournisseur reconnais l'id</returns>
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bool Bind (string eventId);
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/// <summary>Signale au fournisseur que l'evenement n'est plus attendu </summary>
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/// <param name='eventId'>L'id de l'evenement.</param>
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void Unbind (string eventId);
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/// <summary>Demande la construction du sous-menu evenement au fournisseur</summary>
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/// <returns>Le sous menu</returns>
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/// <param name='state'>Un objet qui sera devra etre stocké dans Data[EventManager.StateKey]</param>
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/// <param name='handler'>La delegate qui devra etre associée aux ButtonClickedEvent</param>
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Gtk.Menu GetProviderSubMenu( EventManager.EventMenuData state, Gtk.ButtonPressEventHandler handler );
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/// <summary>Appelé par le Timer de la conduite</summary>
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/// <param name='callback'>Fonction a appeler pour chaque evenement.</param>
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void ProcessEvents(EventManagerCallback callback);
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}
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/// <summary>
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/// Interface pour les recepteurs d'evenements.
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/// </summary>
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public interface IEventTarget
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{
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/// <summary>Fonction appelée lors d'un evenement</summary>
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/// <returns>Vrai si l'evenement est traité</returns>
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/// <param name='data'>Evenement</param>
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bool FireEvent(EventData data);
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/// <summary>Indique a la cible qu'on lui associe un evenement</summary>
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/// <param name='id'>l'id de l'evenement</param>
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void Bind(string id);
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/// <summary>Indique a la cible qu'on lui des associe un evenement</summary>
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/// <param name='id'>l'id de l'evenement</param>
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void Unbind(string id);
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}
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/// <summary>
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/// Callback sur evenement.
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/// </summary>
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public delegate void EventManagerCallback(EventData data);
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/// <summary>
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/// Callback appele sur clic sur un bouton de menu de choix d'evenement
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/// </summary>
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public delegate void EventManagerMenuCallBack(object state, string eventId);
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/// <summary>
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/// Cible generique d'evenement.
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/// </summary>
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public class actionEventTarget : IEventTarget {
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public delegate bool EventAction (EventData data);
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EventAction action;
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public actionEventTarget(EventAction _action)
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{
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action=_action;
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}
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#region IEventTarget implementation
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bool IEventTarget.FireEvent (EventData data)
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{
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return action(data);
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}
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void IEventTarget.Bind (string id){} // Rien a faire ici
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void IEventTarget.Unbind (string id){}
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#endregion
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}
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public class EventManager
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{
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Dictionary<string,eventBinding> bindings = new Dictionary<string,eventBinding>();
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List<IEventProvider> providers = new List<IEventProvider>();
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Dictionary<string,IEventProvider> feedbackLookup = new Dictionary<string, IEventProvider>();
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class eventBinding
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{
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List<IEventTarget> targets=new List<IEventTarget>();
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public void AddTarget(IEventTarget target)
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{
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if(!targets.Contains(target))
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targets.Add(target);
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}
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public void RemoveTarget(IEventTarget target)
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{
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targets.Remove(target);
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}
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public ICollection<IEventTarget> Targets {
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get {
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return targets;
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}
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}
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}
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public EventManager ()
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{
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}
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public void RegisterProvider (IEventProvider prov)
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{
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providers.Add (prov);
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foreach (var bind in bindings) {
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if (prov.Bind (bind.Key)) {
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feedbackLookup[bind.Key] = prov;
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}
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}
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}
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#region Menus
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// Cles pour association d'etat au elements de menu
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static public object StateKey = new object();
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static public object EventIdKey = new object();
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// Objet associe aux menus afin de pourvoir retransmettre les infos au createur du menu
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public class EventMenuData {
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public EventManagerMenuCallBack CallBack;
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public object state;
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}
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///<summary> Appelé par l'interface. L'objet 'state' sera retransmis tel quel lors de l'appel au callback </summary>
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public Gtk.Menu GetMenu (object state, EventManagerMenuCallBack callback)
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{
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Gtk.Menu menu = new Gtk.Menu ();
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EventMenuData evd = new EventMenuData();
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evd.CallBack = callback;
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evd.state = state;
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Gtk.ButtonPressEventHandler handler = new Gtk.ButtonPressEventHandler (HandleButtonPressEvent);
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foreach (IEventProvider prov in providers) {
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Gtk.MenuItem provitem = new Gtk.MenuItem(prov.MenuName);
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provitem.Submenu = prov.GetProviderSubMenu(evd, handler);
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if(provitem.Submenu!=null) menu.Add(provitem);
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}
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// Creation de l'element 'Aucun' retournant un ID vide, pour permettre la desassociation
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Gtk.MenuItem itemNone = new Gtk.MenuItem("Aucun");
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itemNone.Data[StateKey] = evd;
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itemNone.Data[EventIdKey] = "";
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itemNone.ButtonPressEvent += handler;
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menu.Add(itemNone);
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return menu;
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}
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///<summary> Traitement du clic sur les menus generes au dessus </summary>
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void HandleButtonPressEvent (object o, Gtk.ButtonPressEventArgs args)
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{
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Gtk.MenuItem item = o as Gtk.MenuItem;
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EventMenuData evd = item.Data[EventManager.StateKey] as EventMenuData; // On récupere l'objet d'etat et la fonction a rappeler
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string id = item.Data[EventManager.EventIdKey] as string; // ainsi que l'id evenement
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evd.CallBack(evd.state,id); // Appel de la fonction
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}
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#endregion
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///<summary> Appelé par le Timer de la conduite ... appel le traitement pour l'ensemble des fournisseurs </summary>
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public void ProcessEvents ()
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{
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foreach (IEventProvider prov in providers) {
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prov.ProcessEvents(new EventManagerCallback(EventCallBack));
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}
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}
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public void UnregisterProvider (IEventProvider prov)
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{
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providers.Remove(prov);
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var q = from feedback in feedbackLookup where feedback.Value == prov select feedback.Key;
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foreach(string id in q.ToArray())
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feedbackLookup.Remove(id);
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}
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///<summary> Enregistrement d'une association id => cible
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public bool Bind (string eventId, IEventTarget target)
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{
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if(!bindings.ContainsKey(eventId))
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bindings.Add (eventId,new eventBinding());
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bindings[eventId].AddTarget(target);
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target.Bind(eventId);
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foreach (IEventProvider prov in providers) {
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if(prov.Bind(eventId)) {
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feedbackLookup[eventId] = prov;
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return true;
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}
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}
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return false;
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}
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///<summary> Desenregistrement de toutes les associations d'une cible</summary>
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public void Unbind (IEventTarget target)
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{
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var q = from bind in bindings where bind.Value.Targets.Contains(target) select bind.Key;
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foreach(string id in q.ToArray())
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Unbind(id,target);
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}
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///<summary> Desenregistrement d'une association id => cible</summary>
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public void Unbind (string eventId, IEventTarget target)
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{
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if (!bindings.ContainsKey (eventId)) return;
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bindings [eventId].RemoveTarget (target);
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if (bindings [eventId].Targets.Count == 0) {
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bindings.Remove(eventId);
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foreach (IEventProvider prov in providers) {
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prov.Unbind(eventId);
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}
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}
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target.Unbind(eventId);
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}
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///<summary> Fonction appelee sur evenement</summary>
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public void EventCallBack (EventData data)
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{
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Console.WriteLine("Event {0} => {1}",data.id,data.value);
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if (bindings.ContainsKey (data.id)) {
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foreach (IEventTarget target in bindings[data.id].Targets) {
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target.FireEvent(data);
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}
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}
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}
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public bool SaveBindings (System.Xml.XmlElement xmlParent, IEventTarget target)
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{
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bool ret=false;
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System.Xml.XmlElement xmlB;
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var q = from bind in bindings
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where bind.Value.Targets.Contains(target)
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select bind.Key;
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foreach (string id in q) {
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ret=true;
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xmlParent.AppendChild(xmlB = xmlParent.OwnerDocument.CreateElement("EventBinding"));
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xmlB.SetAttribute("id",id);
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}
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return ret;
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}
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public static string[] LoadBindings (System.Xml.XmlElement xmlParent)
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{
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var all=xmlParent.GetElementsByTagName("EventBinding");
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string[] ret = new string[all.Count]; int index=0;
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foreach (var xb in all) {
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ret[index++] = (xb as System.Xml.XmlElement).GetAttribute("id");
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}
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return ret;
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}
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}
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}
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