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| /* |
| Auto-Completion Textbox for GWT |
| Copyright (C) 2006 Oliver Albers http://gwt.components.googlepages.com/ |
| |
| This library is free software; you can redistribute it and/or |
| modify it under the terms of the GNU Lesser General Public |
| License as published by the Free Software Foundation; either |
| version 2.1 of the License, or (at your option) any later version. |
| |
| This library is distributed in the hope that it will be useful, |
| but WITHOUT ANY WARRANTY; without even the implied warranty of |
| MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| Lesser General Public License for more details. |
| |
| You should have received a copy of the GNU Lesser General Public |
| License along with this library; if not, write to the Free Software |
| Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
| |
| */ |
| package org.tela_botanica.client; |
| |
| |
| // TODO : traiter latence (augmenter en fonction rapidité saisie + texte vide) |
| // TODO : traiter Tab (selection) |
| // TODO : revoir traitement keyup, keydown |
| |
| import com.google.gwt.json.client.JSONArray; |
| import com.google.gwt.json.client.JSONParser; |
| import com.google.gwt.json.client.JSONString; |
| import com.google.gwt.json.client.JSONValue; |
| import com.google.gwt.user.client.HTTPRequest; |
| import com.google.gwt.user.client.ResponseTextHandler; |
| import com.google.gwt.user.client.ui.ChangeListener; |
| import com.google.gwt.user.client.ui.KeyboardListener; |
| import com.google.gwt.user.client.ui.ListBox; |
| import com.google.gwt.user.client.ui.PopupPanel; |
| import com.google.gwt.user.client.ui.RootPanel; |
| import com.google.gwt.user.client.ui.TextBox; |
| import com.google.gwt.user.client.ui.Widget; |
| |
| import java.util.Vector; |
| import java.util.HashMap; |
| |
| |
| |
| public class AutoCompleteAsyncTextBox extends TextBox |
| implements KeyboardListener, ChangeListener, SourcesAutoCompleteAsyncTextBoxEvents { |
| |
| private String searchUrl = null; |
| private AutoCompleteAsyncTextBoxListenerCollection autoCompleteAsyncTextBoxListeners=null; |
| |
| private HashMap cache = new HashMap(); |
| private boolean searching = false; |
| |
| protected PopupPanel choicesPopup = new PopupPanel(true); |
| protected ListBox choices = new ListBox(); |
| protected Vector items = new Vector(); |
| protected boolean popupAdded = false; |
| protected boolean visible = false; |
| |
| /** |
| * Default Constructor |
| * |
| */ |
| public AutoCompleteAsyncTextBox() |
| { |
| super(); |
| this.addKeyboardListener(this); |
| choices.addChangeListener(this); |
| this.setStyleName("AutoCompleteAsyncTextBox"); |
| |
| choicesPopup.add(choices); |
| choicesPopup.addStyleName("AutoCompleteChoices"); |
| |
| choices.setStyleName("list"); |
| |
| } |
| |
| |
| |
| public void addAutoCompleteAsyncTextBoxListener(AutoCompleteAsyncTextBoxListener listener) { |
| if (autoCompleteAsyncTextBoxListeners == null) { |
| autoCompleteAsyncTextBoxListeners = new AutoCompleteAsyncTextBoxListenerCollection(); |
| } |
| autoCompleteAsyncTextBoxListeners.addElement(listener); |
| } |
| |
| |
| |
| public void setSearchUrl(String url) { |
| |
| this.searchUrl=url; |
| } |
| |
| private void doFetchURL(String match) { |
| /* |
| * Here we fetch the URL and call the handler |
| */ |
| |
| if (this.searchUrl!=null && searching==false) { |
| searching=true; |
| HTTPRequest.asyncGet(this.searchUrl + match, |
| new ResponseTextHandler(){ |
| public void onCompletion(String str) { |
| |
| JSONValue jsonValue= JSONParser.parse(str); |
| JSONArray jsonArray; |
| JSONString jsonString; |
| |
| if ((jsonArray = jsonValue.isArray()) != null) { |
| for (int i = 0; i < jsonArray.size(); ++i) { |
| if ((jsonString = (jsonArray.get(i)).isString()) != null) { |
| addItem(jsonString.stringValue()); |
| } |
| } |
| } |
| |
| displayList(); |
| |
| |
| |
| } |
| |
| |
| |
| }); |
| |
| } |
| } |
| |
| |
| /** |
| * Not used at all |
| */ |
| public void onKeyDown(Widget arg0, char arg1, int arg2) { |
| } |
| |
| /** |
| * Not used at all |
| */ |
| public void onKeyPress(Widget arg0, char arg1, int arg2) { |
| |
| if(arg1 == KEY_DOWN) |
| { |
| int selectedIndex = choices.getSelectedIndex(); |
| selectedIndex++; |
| if(selectedIndex >= choices.getItemCount()) |
| { |
| selectedIndex = 0; |
| } |
| choices.setSelectedIndex(selectedIndex); |
| |
| return; |
| } |
| |
| if(arg1 == KEY_UP) |
| { |
| int selectedIndex = choices.getSelectedIndex(); |
| selectedIndex--; |
| if(selectedIndex < 0) |
| { |
| selectedIndex = choices.getItemCount() - 1 ; |
| } |
| choices.setSelectedIndex(selectedIndex); |
| |
| return; |
| } |
| |
| |
| } |
| |
| /** |
| * A key was released, start autocompletion |
| */ |
| public void onKeyUp(Widget arg0, char arg1, int arg2) { |
| |
| |
| if(arg1 == KEY_DOWN) |
| { |
| return; |
| |
| } |
| |
| |
| if(arg1 == KEY_UP) |
| { |
| return; |
| |
| } |
| |
| if(arg1 == KEY_ENTER) |
| { |
| if(visible) |
| { |
| complete(); |
| } |
| else { |
| // Validation de l'entree : |
| if (autoCompleteAsyncTextBoxListeners!= null) { |
| autoCompleteAsyncTextBoxListeners.fireTextBoxEnter(this, this.getText()); |
| } |
| |
| this.setText(""); |
| } |
| |
| return; |
| } |
| |
| if(arg1 == KEY_ESCAPE) |
| { |
| choices.clear(); |
| items.clear(); |
| choicesPopup.hide(); |
| visible = false; |
| |
| return; |
| } |
| |
| |
| // Lancement appel |
| String text = this.getText(); |
| |
| if(text.length() > 0) |
| { |
| items.clear(); |
| |
| if (getFromCache(text)!=null) { |
| items=getFromCache(text); |
| displayList(); |
| } |
| else { |
| this.doFetchURL(text); |
| } |
| } |
| } |
| |
| |
| // Display assistant |
| |
| public void displayList() { |
| |
| searching=false; |
| if(this.items.size() > 0) |
| { |
| |
| addToCache(this.getText(),(Vector) items.clone()); |
| |
| choices.clear(); |
| |
| for(int i = 0; i < items.size(); i++) |
| { |
| choices.addItem((String) items.get(i)); |
| } |
| |
| |
| // if there is only one match and it is what is in the |
| // text field anyways there is no need to show autocompletion |
| if(items.size() == 1 && ((String) items.get(0)).compareTo(this.getText()) == 0) |
| { |
| choicesPopup.hide(); |
| } else { |
| choices.setSelectedIndex(0); |
| choices.setVisibleItemCount(items.size()); |
| |
| if(!popupAdded) |
| { |
| RootPanel.get().add(choicesPopup); |
| popupAdded = true; |
| } |
| choicesPopup.show(); |
| visible = true; |
| choicesPopup.setPopupPosition(this.getAbsoluteLeft(), |
| this.getAbsoluteTop() + this.getOffsetHeight()); |
| //choicesPopup.setWidth(this.getOffsetWidth() + "px"); |
| choices.setWidth(this.getOffsetWidth() + "px"); |
| } |
| |
| } else { |
| visible = false; |
| choicesPopup.hide(); |
| } |
| } |
| |
| /** |
| * A mouseclick in the list of items |
| */ |
| public void onChange(Widget arg0) { |
| complete(); |
| } |
| |
| public void onClick(Widget arg0) { |
| complete(); |
| } |
| |
| // add selected item to textbox |
| protected void complete() |
| { |
| if(choices.getItemCount() > 0) |
| { |
| this.setText(choices.getItemText(choices.getSelectedIndex())); |
| } |
| |
| visible=false; |
| items.clear(); |
| choices.clear(); |
| choicesPopup.hide(); |
| } |
| |
| |
| public void addItem(String item) { |
| items.add(item); |
| } |
| |
| private void addToCache (String query, Vector result) |
| { |
| cache.put(query.toLowerCase(),result); |
| } |
| |
| private Vector getFromCache (String query) |
| { |
| return (Vector) cache.get(query.toLowerCase()); |
| } |
| |
| |
| |
| |
| } |
| |