code.grnet.gr Git - pithos/blob - src/gr/ebs/gss/client/Search.java

   1 /*\r
   2  * Copyright 2007, 2008, 2009 Electronic Business Systems Ltd.\r
   3  *\r
   4  * This file is part of GSS.\r
   5  *\r
   6  * GSS is free software: you can redistribute it and/or modify\r
   7  * it under the terms of the GNU General Public License as published by\r
   8  * the Free Software Foundation, either version 3 of the License, or\r
   9  * (at your option) any later version.\r
  10  *\r
  11  * GSS is distributed in the hope that it will be useful,\r
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of\r
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\r
  14  * GNU General Public License for more details.\r
  15  *\r
  16  * You should have received a copy of the GNU General Public License\r
  17  * along with GSS.  If not, see <http://www.gnu.org/licenses/>.\r
  18  */\r
  19 package gr.ebs.gss.client;\r
  20 \r
  21 import com.google.gwt.user.client.ui.AbstractImagePrototype;\r
  22 import com.google.gwt.user.client.ui.Button;\r
  23 import com.google.gwt.user.client.ui.ClickListener;\r
  24 import com.google.gwt.user.client.ui.Composite;\r
  25 import com.google.gwt.user.client.ui.FocusListener;\r
  26 import com.google.gwt.user.client.ui.HasHorizontalAlignment;\r
  27 import com.google.gwt.user.client.ui.HasVerticalAlignment;\r
  28 import com.google.gwt.user.client.ui.HorizontalPanel;\r
  29 import com.google.gwt.user.client.ui.ImageBundle;\r
  30 import com.google.gwt.user.client.ui.KeyboardListenerAdapter;\r
  31 import com.google.gwt.user.client.ui.TextBox;\r
  32 import com.google.gwt.user.client.ui.Widget;\r
  33 \r
  34 /**\r
  35  * A component that contains the search form.\r
  36  */\r
  37 public class Search extends Composite implements FocusListener {\r
  38 \r
  39         /**\r
  40          * The text hint that is displayed in the empty search box.\r
  41          */\r
  42         private static final String TEXT_HINT = "Search for files...";\r
  43 \r
  44         /**\r
  45          * Specifies the images that will be bundled for this Composite.\r
  46          */\r
  47         public interface Images extends ImageBundle {\r
  48                 @Resource("gr/ebs/gss/resources/search_16.png")\r
  49                 AbstractImagePrototype searchButton();\r
  50         }\r
  51 \r
  52         /**\r
  53          * The embedded text box widget that contains the search query.\r
  54          */\r
  55         private TextBox tb = new TextBox();\r
  56 \r
  57         /**\r
  58          * The search widget constructor.\r
  59          *\r
  60          * @param images the image bundle\r
  61          */\r
  62         public Search(final Images images) {\r
  63                 tb.setWidth("200px");\r
  64                 tb.setText(TEXT_HINT);\r
  65                 tb.setStylePrimaryName("gss-search");\r
  66                 tb.addStyleDependentName("empty");\r
  67                 tb.addFocusListener(this);\r
  68                 tb.addKeyboardListener(new KeyboardListenerAdapter() {\r
  69 \r
  70                         @Override\r
  71                         public void onKeyPress(Widget sender, char keyCode, int modifiers) {\r
  72                                 if (keyCode == '\r')\r
  73                                         GSS.get().showSearchResults(tb.getText());\r
  74                                 else if (keyCode == 27) {\r
  75                                         // Simulate the proper behavior for the escape key (27 ==\r
  76                                         // ESC).\r
  77                                         onLostFocus(sender);\r
  78                                         tb.setFocus(false);\r
  79                                 }\r
  80                         }\r
  81                 });\r
  82 \r
  83                 Button b = new Button(createHeaderHTML(images.searchButton(), "Search"), new ClickListener() {\r
  84 \r
  85                         public void onClick(Widget sender) {\r
  86                                 GSS.get().showSearchResults(tb.getText());\r
  87                         }\r
  88                 });\r
  89 \r
  90                 HorizontalPanel panel = new HorizontalPanel();\r
  91                 panel.setVerticalAlignment(HasVerticalAlignment.ALIGN_MIDDLE);\r
  92                 panel.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_CENTER);\r
  93                 panel.add(tb);\r
  94                 panel.add(b);\r
  95                 initWidget(panel);\r
  96         }\r
  97 \r
  98         /**\r
  99          * Creates an HTML fragment that places an image & caption together.\r
 100          *\r
 101          * @param imageProto an image prototype for an image\r
 102          * @param caption the caption\r
 103          * @return the HTML fragment\r
 104          */\r
 105         private String createHeaderHTML(AbstractImagePrototype imageProto, String caption) {\r
 106                 String captionHTML = "<table cellpadding='0' cellspacing='0'>" + "<tr><td>" +\r
 107                         imageProto.getHTML() + "</td><td style='font-size: 90%;'>&nbsp;" +\r
 108                         caption + "</td></tr></table>";\r
 109                 return captionHTML;\r
 110         }\r
 111 \r
 112         public void onFocus(Widget sender) {\r
 113                 TextBox b = (TextBox) sender;\r
 114                 if (b.getText().equals(TEXT_HINT))\r
 115                         b.setText("");\r
 116                 sender.removeStyleDependentName("empty");\r
 117         }\r
 118 \r
 119         public void onLostFocus(Widget sender) {\r
 120                 TextBox b = (TextBox) sender;\r
 121                 if (b.getText().equals("")) {\r
 122                         b.addStyleDependentName("empty");\r
 123                         b.setText(TEXT_HINT);\r
 124                 }\r
 125         }\r
 126 }\r