code.grnet.gr Git - pithos-web-client/blob - src/org/gss_project/gss/web/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 org.gss_project.gss.web.client;\r
  20 \r
  21 import com.google.gwt.event.dom.client.BlurEvent;\r
  22 import com.google.gwt.event.dom.client.BlurHandler;\r
  23 import com.google.gwt.event.dom.client.ClickEvent;\r
  24 import com.google.gwt.event.dom.client.ClickHandler;\r
  25 import com.google.gwt.event.dom.client.FocusEvent;\r
  26 import com.google.gwt.event.dom.client.FocusHandler;\r
  27 import com.google.gwt.event.dom.client.KeyPressEvent;\r
  28 import com.google.gwt.event.dom.client.KeyPressHandler;\r
  29 import com.google.gwt.resources.client.ClientBundle;\r
  30 import com.google.gwt.resources.client.ImageResource;\r
  31 import com.google.gwt.user.client.ui.AbstractImagePrototype;\r
  32 import com.google.gwt.user.client.ui.Button;\r
  33 import com.google.gwt.user.client.ui.Composite;\r
  34 import com.google.gwt.user.client.ui.HasHorizontalAlignment;\r
  35 import com.google.gwt.user.client.ui.HasVerticalAlignment;\r
  36 import com.google.gwt.user.client.ui.HorizontalPanel;\r
  37 import com.google.gwt.user.client.ui.TextBox;\r
  38 import com.google.gwt.user.client.ui.Widget;\r
  39 \r
  40 /**\r
  41  * A component that contains the search form.\r
  42  */\r
  43 public class Search extends Composite implements FocusHandler,BlurHandler {\r
  44 \r
  45         /**\r
  46          * The text hint that is displayed in the empty search box.\r
  47          */\r
  48         private static final String TEXT_HINT = "Search for files...";\r
  49 \r
  50         /**\r
  51          * Specifies the images that will be bundled for this Composite.\r
  52          */\r
  53         public interface Images extends ClientBundle {\r
  54                 @Source("org/gss_project/gss/resources/search_16.png")\r
  55                 ImageResource searchButton();\r
  56         }\r
  57 \r
  58         /**\r
  59          * The embedded text box widget that contains the search query.\r
  60          */\r
  61         private TextBox tb = new TextBox();\r
  62 \r
  63         /**\r
  64          * The search widget constructor.\r
  65          *\r
  66          * @param images the image bundle\r
  67          */\r
  68         public Search(final Images images) {\r
  69                 tb.setWidth("200px");\r
  70                 tb.setText(TEXT_HINT);\r
  71                 tb.setStylePrimaryName("gss-search");\r
  72                 tb.addStyleDependentName("empty");\r
  73                 tb.addFocusHandler(this);\r
  74                 tb.addBlurHandler(this);\r
  75                 tb.getElement().setId("textBox.search");\r
  76                 tb.addKeyPressHandler(new KeyPressHandler() {\r
  77 \r
  78                         @Override\r
  79                         public void onKeyPress(KeyPressEvent event) {\r
  80                                 char keyCode = event.getCharCode();\r
  81                                 if (keyCode == '\r')\r
  82                                         GSS.get().showSearchResults(tb.getText());\r
  83                                 else if (keyCode == 27) {\r
  84                                         // Simulate the proper behavior for the escape key\r
  85                                         // (27 == ESC).\r
  86                                         onLostFocus((Widget)event.getSource());\r
  87                                         tb.setFocus(false);\r
  88                                 }\r
  89                         }\r
  90                 });\r
  91 \r
  92                 Button b = new Button(createHeaderHTML(images.searchButton(), "Search"), new ClickHandler() {\r
  93                         @Override\r
  94                         public void onClick(ClickEvent event) {\r
  95                                 GSS.get().showSearchResults(tb.getText());\r
  96                         }\r
  97                 });\r
  98                 b.getElement().setId("button.search");\r
  99                 \r
 100                 HorizontalPanel panel = new HorizontalPanel();\r
 101                 panel.setVerticalAlignment(HasVerticalAlignment.ALIGN_MIDDLE);\r
 102                 panel.setHorizontalAlignment(HasHorizontalAlignment.ALIGN_CENTER);\r
 103                 panel.add(tb);\r
 104                 panel.add(b);\r
 105                 initWidget(panel);\r
 106         }\r
 107 \r
 108         /**\r
 109          * Creates an HTML fragment that places an image & caption together.\r
 110          *\r
 111          * @param imageProto an image prototype for an image\r
 112          * @param caption the caption\r
 113          * @return the HTML fragment\r
 114          */\r
 115         private String createHeaderHTML(ImageResource imageProto, String caption) {\r
 116                 String captionHTML = "<table cellpadding='0' cellspacing='0'>" + "<tr><td>" +\r
 117                 AbstractImagePrototype.create(imageProto).getHTML() + "</td><td style='font-size: 90%;'>&nbsp;" +\r
 118                         caption + "</td></tr></table>";\r
 119                 return captionHTML;\r
 120         }\r
 121 \r
 122         public void onLostFocus(Widget sender) {\r
 123                 TextBox b = (TextBox) sender;\r
 124                 if (b.getText().equals("")) {\r
 125                         b.addStyleDependentName("empty");\r
 126                         b.setText(TEXT_HINT);\r
 127                 }\r
 128         }\r
 129 \r
 130         @Override\r
 131         public void onFocus(FocusEvent event) {\r
 132                 TextBox b = (TextBox) event.getSource();\r
 133                 if (b.getText().equals(TEXT_HINT))\r
 134                         b.setText("");\r
 135                 b.removeStyleDependentName("empty");\r
 136         }\r
 137 \r
 138         @Override\r
 139         public void onBlur(BlurEvent event) {\r
 140                 TextBox b = (TextBox) event.getSource();\r
 141                 onLostFocus(b);\r
 142         }\r
 143 }\r