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

   1 /*
   2  * Copyright 2009 Electronic Business Systems Ltd.
   3  *
   4  * This file is part of GSS.
   5  *
   6  * GSS is free software: you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License as published by
   8  * the Free Software Foundation, either version 3 of the License, or
   9  * (at your option) any later version.
  10  *
  11  * GSS is distributed in the hope that it will be useful,
  12  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  13  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14  * GNU General Public License for more details.
  15  *
  16  * You should have received a copy of the GNU General Public License
  17  * along with GSS.  If not, see <http://www.gnu.org/licenses/>.
  18  */
  19 package gr.ebs.gss.client;
  20
  21 import com.google.gwt.dom.client.NativeEvent;
  22 import com.google.gwt.event.dom.client.ClickEvent;
  23 import com.google.gwt.event.dom.client.ClickHandler;
  24 import com.google.gwt.event.dom.client.KeyCodes;
  25 import com.google.gwt.user.client.Event.NativePreviewEvent;
  26 import com.google.gwt.user.client.ui.AbstractImagePrototype;
  27 import com.google.gwt.user.client.ui.Button;
  28 import com.google.gwt.user.client.ui.DialogBox;
  29 import com.google.gwt.user.client.ui.HTML;
  30 import com.google.gwt.user.client.ui.HasHorizontalAlignment;
  31 import com.google.gwt.user.client.ui.HorizontalPanel;
  32 import com.google.gwt.user.client.ui.VerticalPanel;
  33
  34
  35 /**
  36  * A dialog for requesting confirmation from the user.
  37  *
  38  * @author kman
  39  */
  40 public abstract class ConfirmationDialog extends DialogBox {
  41
  42         /**
  43          * The widget's constructor.
  44          *
  45          * @param message the message to display
  46          * @param buttonLabel the label of the confirmation button
  47          */
  48         public ConfirmationDialog(String message, String buttonLabel) {
  49                 // Set the dialog's caption.
  50                 setText("Confirmation");
  51                 setAnimationEnabled(true);
  52                 // Create a VerticalPanel to contain the label and the buttons.
  53                 VerticalPanel outer = new VerticalPanel();
  54                 HorizontalPanel buttons = new HorizontalPanel();
  55
  56                 HTML text = new HTML("<table><tr><td rowspan='2'> " +
  57                                 AbstractImagePrototype.create(MessagePanel.images.warn()).getHTML() +
  58                                 "</td><td>" + message + "</td></tr></table>");
  59                 text.setStyleName("gss-warnMessage");
  60                 outer.add(text);
  61
  62                 // Create the 'Update' button, along with a listener that hides the
  63                 // dialog when the button is clicked and renames the file.
  64                 Button ok = new Button(buttonLabel, new ClickHandler() {
  65
  66                         @Override
  67                         public void onClick(ClickEvent event) {
  68                                 confirm();
  69                                 hide();
  70                         }
  71                 });
  72                 ok.getElement().setId("confirmation.ok");
  73                 buttons.add(ok);
  74                 buttons.setCellHorizontalAlignment(ok, HasHorizontalAlignment.ALIGN_CENTER);
  75                 // Create the 'Cancel' button, along with a listener that hides the
  76                 // dialog when the button is clicked.
  77                 Button cancel = new Button("Cancel", new ClickHandler() {
  78
  79                         @Override
  80                         public void onClick(ClickEvent event) {
  81                                 hide();
  82                                 cancel();
  83                         }
  84                 });
  85                 cancel.getElement().setId("confirmation.cancel");
  86                 buttons.add(cancel);
  87                 buttons.setCellHorizontalAlignment(cancel, HasHorizontalAlignment.ALIGN_CENTER);
  88                 buttons.setSpacing(8);
  89                 buttons.setStyleName("gss-warnMessage");
  90                 outer.setStyleName("gss-warnMessage");
  91                 outer.add(buttons);
  92                 outer.setCellHorizontalAlignment(text, HasHorizontalAlignment.ALIGN_CENTER);
  93                 outer.setCellHorizontalAlignment(buttons, HasHorizontalAlignment.ALIGN_CENTER);
  94                 setWidget(outer);
  95         }
  96
  97         @Override
  98         protected void onPreviewNativeEvent(NativePreviewEvent preview) {
  99                 super.onPreviewNativeEvent(preview);
 100                 NativeEvent evt = preview.getNativeEvent();
 101                 if (evt.getType().equals("keydown"))
 102                         // Use the popup's key preview hooks to close the dialog when either
 103                         // enter or escape is pressed.
 104                         switch (evt.getKeyCode()) {
 105                                 case KeyCodes.KEY_ENTER:
 106                                         hide();
 107                                         confirm();
 108                                         break;
 109                                 case KeyCodes.KEY_ESCAPE:
 110                                         hide();
 111                                         cancel();
 112                                         break;
 113                         }
 114         }
 115
 116         public abstract void confirm();
 117
 118         public abstract void cancel();
 119 }