Java/GWT/Auto Completion

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Auto-Completion Textbox for GWT

   <source lang="java">

package com.jexp.gwt.client; import java.util.ArrayList; import com.google.gwt.user.client.ui.*; import com.google.gwt.core.client.EntryPoint; public class GWTClient implements EntryPoint{ 

 public void onModuleLoad() {
   final AutoCompleteTextBox box = new AutoCompleteTextBox();
   box.setCompletionItems(new SimpleAutoCompletionItems(
           new String[]{ "apple", "ape", "anything", "else"}));
   Label zipLabel = new Label("zip");
      
   Grid grid = new Grid(4, 2);
   grid.setWidget(0, 0, zipLabel);
   grid.setWidget(0, 1, box);
   
   RootPanel.get().add(grid);

 }

} /* Auto-Completion Textbox for GWT Copyright (C) 2006 Oliver Albers http://gwt.ruponents.googlepages.ru/ 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

  • /

interface CompletionItems { 

       /**
        * Returns an array of all completion items matching
        * @param match The user-entered text all compleition items have to match
        * @return      Array of strings
        */
       public String[] getCompletionItems(String match);

} /* Auto-Completion Textbox for GWT Copyright (C) 2006 Oliver Albers http://gwt.ruponents.googlepages.ru/ 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

  • /

class AutoCompleteTextBox extends TextBox 

   implements KeyboardListener, ChangeListener {
  
 protected PopupPanel choicesPopup = new PopupPanel(true);
 protected ListBox choices = new ListBox();
 protected CompletionItems items = new SimpleAutoCompletionItems(new String[]{});
 protected boolean popupAdded = false;
 protected boolean visible = false;
  
 /**
  * Default Constructor
  *
  */
 public AutoCompleteTextBox()
 {
   super();
   this.addKeyboardListener(this);
   choices.addChangeListener(this);
   this.setStyleName("AutoCompleteTextBox");
      
   choicesPopup.add(choices);
   choicesPopup.addStyleName("AutoCompleteChoices");
      
   choices.setStyleName("list");
 }
 /**
  * Sets an "algorithm" returning completion items
  * You can define your own way how the textbox retrieves autocompletion items
  * by implementing the CompletionItems interface and setting the according object
  * @see SimpleAutoCompletionItem
  * @param items CompletionItem implementation
  */
 public void setCompletionItems(CompletionItems items)
 {
   this.items = items;
 }
  
 /**
  * Returns the used CompletionItems object
  * @return CompletionItems implementation
  */
 public CompletionItems getCompletionItems()
 {
   return this.items;
 }
  
 /**
  * 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) {
 }
 /**
  * A key was released, start autocompletion
  */
 public void onKeyUp(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();
     }
     choices.setSelectedIndex(selectedIndex);
          
     return;        
   }
      
   if(arg1 == KEY_ENTER)
   {
     if(visible)
     {
       complete();
     }
          
     return;
   }
      
   if(arg1 == KEY_ESCAPE)
   {
     choices.clear();
     choicesPopup.hide();
     visible = false;
          
     return;
   }
      
   String text = this.getText();
   String[] matches = new String[]{};
   if(text.length() > 0)
   {
     matches = items.getCompletionItems(text);
   }
      
   if(matches.length > 0)
   {
     choices.clear();
          
     for(int i = 0; i < matches.length; i++)
     {
       choices.addItem((String) matches[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(matches.length == 1 && matches[0].rupareTo(text) == 0)
     {
       choicesPopup.hide();
     } else {
       choices.setSelectedIndex(0);
       choices.setVisibleItemCount(matches.length + 1);
              
       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()));
   }
      
   choices.clear();
   choicesPopup.hide();
 }

}


/* Auto-Completion Textbox for GWT Copyright (C) 2006 Oliver Albers http://gwt.ruponents.googlepages.ru/ 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

  • /

class AutoCompleteTextArea extends TextArea 

   implements KeyboardListener, ChangeListener {
  
 protected PopupPanel choicesPopup = new PopupPanel(true);
 protected ListBox choices = new ListBox();
 protected CompletionItems items = new SimpleAutoCompletionItems(new String[]{});
 protected boolean popupAdded = false;
 protected String typedText = "";
 protected boolean visible = false;
  
 protected int posy = -1;
  
 /**
  * Default Constructor
  *
  */
 public AutoCompleteTextArea()
 {
   super();
   this.addKeyboardListener(this);
   choices.addChangeListener(this);
   this.setStyleName("AutoCompleteTextArea");
      
   choicesPopup.add(choices);
   choicesPopup.addStyleName("AutoCompleteChoices");
      
   choices.setStyleName("list");
 }
 /**
  * Sets an "algorithm" returning completion items
  * You can define your own way how the textbox retrieves autocompletion items
  * by implementing the CompletionItems interface and setting the according object
  * @see SimpleAutoCompletionItem
  * @param items CompletionItem implementation
  */
 public void setCompletionItems(CompletionItems items)
 {
   this.items = items;
 }
  
 /**
  * Returns the used CompletionItems object
  * @return CompletionItems implementation
  */
 public CompletionItems getCompletionItems()
 {
   return this.items;
 }
  
 public void onKeyDown(Widget sender, char keyCode, int modifiers) {
 }
 public void onKeyPress(Widget sender, char keyCode, int modifiers) {
 }
 public void onKeyUp(Widget sender, char keyCode, int modifiers) {
   if(keyCode == KEY_DOWN)
   {
     int selectedIndex = choices.getSelectedIndex();
     selectedIndex++;
     if(selectedIndex > choices.getItemCount())
     {
       selectedIndex = 0;
     }
     choices.setSelectedIndex(selectedIndex);
          
     return;
   }
      
   if(keyCode == KEY_UP)
   {
     int selectedIndex = choices.getSelectedIndex();
     selectedIndex--;
     if(selectedIndex < 0)
     {
       selectedIndex = choices.getItemCount();
     }
     choices.setSelectedIndex(selectedIndex);
          
     return;        
   }
      
   if(keyCode == KEY_ENTER)
   {
     if(visible)
     {
       complete();
     }
          
     return;
   }
      
   if(keyCode == KEY_ESCAPE)
   {
     choices.clear();
     choicesPopup.hide();
     visible = false;
          
     return;
   }
      
   String text = this.getText();
   String[] matches = new String[]{};
      
   String[] words = text.split(" |\n|\r");
   text = words[words.length - 1];
   typedText = text;
      
   if(text.length() > 0)
   {
     matches = items.getCompletionItems(text);
   }
      
   if(matches.length > 0)
   {
     choices.clear();
          
     for(int i = 0; i < matches.length; i++)
     {
       choices.addItem((String) matches[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(matches.length == 1 && matches[0].rupareTo(text) == 0)
     {
       choicesPopup.hide();
     } else {
       choices.setSelectedIndex(0);
       choices.setVisibleItemCount(matches.length + 1);
              
       if(!popupAdded)
       {
         RootPanel.get().add(choicesPopup);
         popupAdded = true;
       }
       choicesPopup.show();
       visible = true;
       int nposy = this.getAbsoluteTop() + this.getOffsetHeight();
       if(posy < 0 || nposy > posy)
       {
         posy = nposy;
       }
       choicesPopup.setPopupPosition(this.getAbsoluteLeft(), posy);
       //choicesPopup.setWidth(this.getOffsetWidth() + "px");
       choices.setWidth(this.getOffsetWidth() + "px");
     }
   } else {
     choicesPopup.hide();
     visible = false;
   }
 }
 public void onChange(Widget sender) {
   complete();
 }
 // add selected item to textarea
 protected void complete()
 {
   if(choices.getItemCount() > 0)
   {
     String text = this.getText();
     text = text.substring(0, text.length() - typedText.length() - 1);
     text += choices.getItemText(choices.getSelectedIndex());
     this.setText(text);
     this.setFocus(true);
   }
      
   choices.clear();
   choicesPopup.hide();
 }

}

/* Auto-Completion Textbox for GWT Copyright (C) 2006 Oliver Albers http://gwt.ruponents.googlepages.ru/ 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

  • /

class SimpleAutoCompletionItems implements CompletionItems { 

 private String[] completions;
 public SimpleAutoCompletionItems(String[] items)
 {
   completions = items;
 }
 public String[] getCompletionItems(String match) {
   ArrayList matches = new ArrayList();
   for (int i = 0; i < completions.length; i++) {
     if (completions[i].toLowerCase().startsWith(match.toLowerCase())) {
       matches.add(completions[i]);
     }
   }
   String[] returnMatches = new String[matches.size()];
   for(int i = 0; i < matches.size(); i++)
   {
     returnMatches[i] = (String)matches.get(i);
   }
   return returnMatches;
 }

} /////////// .sPanel { 

 width: 150px;
 height: 100px;
 position: absolute; 
 left: 15px; 
 top: 240px;

} .panel { 

 background-color: #C3D9FF;
 border: 1px solid #000000;
 padding: 3px;
 margin: 3px;
 font-weight: normal;

} 

      </source>
Источник — «http://jexp.ru/index.php?title=Java/GWT/Auto_Completion&oldid=7091»