Subversion Repositories eFlore/Applications.cel

package org.tela_botanica.client.util.autocompletion;

import java.util.ArrayList;

import java.util.Iterator;

import java.util.List;

import java.util.Map;

import org.tela_botanica.client.cel2;

import org.tela_botanica.client.modeles.objets.Utilisateur;

import com.google.gwt.core.client.Callback;

import com.google.gwt.core.client.JavaScriptObject;

import com.google.gwt.event.dom.client.KeyCodes;

import com.google.gwt.event.dom.client.KeyDownEvent;

import com.google.gwt.event.dom.client.KeyDownHandler;

import com.google.gwt.event.dom.client.KeyPressEvent;

import com.google.gwt.event.dom.client.KeyPressHandler;

import com.google.gwt.event.logical.shared.SelectionEvent;

import com.google.gwt.event.logical.shared.SelectionHandler;

import com.google.gwt.event.logical.shared.ValueChangeEvent;

import com.google.gwt.event.logical.shared.ValueChangeHandler;

import com.google.gwt.http.client.Request;

import com.google.gwt.http.client.RequestBuilder;

import com.google.gwt.http.client.RequestCallback;

import com.google.gwt.http.client.RequestException;

import com.google.gwt.http.client.Response;

import com.google.gwt.http.client.URL;

import com.google.gwt.user.client.Event;

import com.google.gwt.user.client.Timer;

import com.google.gwt.user.client.Window;

import com.google.gwt.user.client.ui.ChangeListener;

import com.google.gwt.user.client.ui.Label;

import com.google.gwt.user.client.ui.MultiWordSuggestOracle;

import com.google.gwt.user.client.ui.SuggestBox;

import com.google.gwt.user.client.ui.SuggestBox.DefaultSuggestionDisplay;

import com.google.gwt.user.client.ui.TextBox;

import com.google.gwt.user.client.ui.SuggestBox.SuggestionDisplay;

import com.google.gwt.user.client.ui.SuggestOracle;

import com.google.gwt.user.client.ui.Widget;

import com.google.gwt.user.client.ui.SuggestOracle.Suggestion;

import com.gwtext.client.widgets.BoxComponent;

import com.gwtext.client.widgets.Component;

import com.gwtext.client.widgets.Container;

import com.gwtext.client.widgets.Panel;

import com.gwtext.client.widgets.event.PanelListener;

import com.gwtext.client.widgets.event.PanelListenerAdapter;

import com.gwtext.client.widgets.layout.FitLayout;

@SuppressWarnings("unchecked")

public abstract class AutoCompletionComboBox extends Panel {

	Label label = null;

	MultiWordSuggestOracle msu = null;

	SuggestBox suggestions = null;

	DefaultSuggestionDisplay sgd = null;

	Callback<String, String> surCopierColler = null;

	SuggestOracle.Request requeteOracle;

    SuggestOracle.Callback callBackOracle;

	Timer suggestionTimer = null;

    int tempsAvantRequete = 500;

    Map<String, String> possibilites = null;

    String urlRequete = "";

	public AutoCompletionComboBox(String nomLabel, String urlRequete) {

		this.setStyleName("champAutoComplete");

		this.label = new Label(nomLabel+":");

		this.urlRequete = urlRequete;

		sgd = new SuggestBox.DefaultSuggestionDisplay();

		msu = new MultiWordSuggestOracle() {

			@Override

			public void requestSuggestions(Request request, Callback callback) {

				List<MultiWordSuggestion> retenus = new ArrayList<MultiWordSuggestion>();

				Iterator<String> it = possibilites.keySet().iterator();

			    while (it.hasNext()) {

			    	String cle = it.next();

			    	String cleAffichee = preTraiterValeurAvantAffichage(possibilites.get(cle));

					MultiWordSuggestion muWoSug = new MultiWordSuggestion(possibilites.get(cle), cleAffichee);

					retenus.add(muWoSug);

			    }

				Response reponse = new Response(retenus);

				callback.onSuggestionsReady(request, reponse);

			}

		};

		suggestions = new SuggestBox(msu, new TextBox(), sgd) {

			public void onBrowserEvent(Event event) {

			    switch (event.getTypeInt()) {

			        case Event.ONPASTE: {

			        	if(surCopierColler != null) {

			        		surCopierColler.onSuccess(suggestions.getValueBox().getValue());

			        	}

			        }

			        break;

			        default:

			        	super.onBrowserEvent(event);

			    }

			}

		};

		suggestions.setAutoSelectEnabled(false);

		setLayout(new FitLayout());

		add(label);

		add(suggestions);

		gererEvenements();

	}

	public void gererEvenements() {

		suggestions.addKeyDownHandler(new KeyDownHandler() {

		    @Override

		    public void onKeyDown(KeyDownEvent event) {

		    	// Lorsque la liste de suggestions est ouverte, une frappe sur entrée selectionne la valeur

		    	// Si elle est fermée, elle déclenche la fonction abstraite de validation (utile pour les champs

		    	// du genre station, milieu etc... et la saisie d'obs rapide

				if(event.getNativeKeyCode() == KeyCodes.KEY_ENTER) {

					if((sgd == null || !sgd.isSuggestionListShowing())) {

						onValidationSaisie();

						event.stopPropagation();

						return;

					} else {

						// Dans les autres cas, un appui sur entrée ne doit pas redéclencher l'autcomplétion

						return;

					}

				}

				// Tout autre frappe d'un caractère "normal" déclenche le timer d'autocomplétion

				if(!KeyDownEvent.isArrow(event.getNativeKeyCode())) {

					gererTimer();

				}

		    }

		});

		requeteOracle = new SuggestOracle.Request();

		callBackOracle = new SuggestOracle.Callback() {

			public void onSuggestionsReady(SuggestOracle.Request request, SuggestOracle.Response response) {

				suggestions.showSuggestionList();

			}

	    };

	    suggestions.addSelectionHandler(new SelectionHandler<SuggestOracle.Suggestion>(){

			@Override

			public void onSelection(SelectionEvent<Suggestion> event) {

				onSelectionValeur();

			}

		});

	    suggestions.addValueChangeHandler(new ValueChangeHandler<String>() {

			@Override

			public void onValueChange(ValueChangeEvent<String> event) {

				onModificationValeur();

			}

		});

	    surCopierColler = new Callback<String, String>() {

			@Override

			public void onSuccess(String result) {

				gererTimer();

			}

			@Override

			public void onFailure(String reason) {

				// rien à faire ça n'échoue jamais

			}

		};

		addListener(new PanelListenerAdapter() {

			@Override

			public void onResize(BoxComponent component, int adjWidth, int adjHeight,

					int rawWidth, int rawHeight) {

				redimensionner(rawWidth);

			}

		});

	}

	public void redimensionner(final int largeur) {

		suggestions.setWidth((largeur - label.getOffsetWidth() - 13)+"px");

	}

	public void gererTimer() {

		if(suggestionTimer == null) {

			suggestionTimer = new Timer() {

				public void run() {

					requeteSuggestions();

				}

			};

			suggestionTimer.schedule(tempsAvantRequete);

		} else {

			suggestionTimer.schedule(tempsAvantRequete);

		}

	}

	public void setTempsAvantRequete(int temps) {

		tempsAvantRequete = temps;

	}

	public int getTempsAvantRequete(int temps) {

		return tempsAvantRequete;

	}

	public void requeteSuggestions() {

		// Suppression des espaces et caractères inutiles

		String valeur = suggestions.getValue().trim().isEmpty() ? null : suggestions.getValue().trim();

		// ceci permet au composant qui utilise l'autocomplétion

		// d'annuler une requete et également d'éviter de faire une requête lors du vidage du champ

		if(valeur == null) {

			return;

		}

		final String urlRequeteFmt = preTraiterUrlRequete(urlRequete, valeur);

		RequestBuilder rb = new RequestBuilder(RequestBuilder.GET, urlRequeteFmt) ;

		try {

			rb.sendRequest(null, new RequestCallback() {

				public void onError(final Request request, final Throwable exception) {

					// TODO Auto-generated method stub

				}

				public void onResponseReceived(final Request request,

						final Response response) {

					surReponseRequete(urlRequeteFmt, response);

				}

			}) ;

		} catch (RequestException e) {

			// TODO Auto-generated catch block

			e.printStackTrace();

		}

	}

	public void surReponseRequete(String requete, Response response) {

		possibilites = parserResultatRequete(response);

		msu.clear();

		Iterator<String> it = possibilites.keySet().iterator();

	    while (it.hasNext()) {

	    	msu.add(possibilites.get(it.next()));

	    }

		requeteOracle.setQuery(requete);

		msu.requestSuggestions(requeteOracle, callBackOracle);

	}

	public String getText() {

		return suggestions.getText();

	}

	public String getRawValue() {

		return suggestions.getText();

	}

	public void setValue(String texte) {

		suggestions.setText(texte);

	}

	public void reset() {

		suggestions.setValue("");

	}

	public void setTabIndex(int index) {

		suggestions.setTabIndex(index);

	}

	public String getLabelText() {

		return label.getText();

	}

	public int getFieldWidth() {

		return suggestions.getOffsetWidth();

	}

	public int getLabelWidth() {

		return label.getOffsetWidth();

	}

	public void agrandirChamp(int largeur) {

		suggestions.setWidth(largeur+"px");

	}

	protected String preTraiterValeurAvantAffichage(String valeur) {

		return valeur;

	}

	protected String preTraiterUrlRequete(String urlRequete, String valeur) {

		return urlRequete+URL.encodeQueryString(valeur);

	}

	protected abstract Map<String, String> parserResultatRequete(Response response);

	protected abstract void onModificationValeur();

	protected abstract void onSelectionValeur();

	protected abstract void onValidationSaisie();

}