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

   1 /*
   2  * Copyright 2011-2012 GRNET S.A. All rights reserved.
   3  *
   4  * Redistribution and use in source and binary forms, with or
   5  * without modification, are permitted provided that the following
   6  * conditions are met:
   7  *
   8  *   1. Redistributions of source code must retain the above
   9  *      copyright notice, this list of conditions and the following
  10  *      disclaimer.
  11  *
  12  *   2. Redistributions in binary form must reproduce the above
  13  *      copyright notice, this list of conditions and the following
  14  *      disclaimer in the documentation and/or other materials
  15  *      provided with the distribution.
  16  *
  17  * THIS SOFTWARE IS PROVIDED BY GRNET S.A. ``AS IS'' AND ANY EXPRESS
  18  * OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
  19  * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
  20  * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL GRNET S.A OR
  21  * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  22  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  23  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
  24  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
  25  * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
  26  * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN
  27  * ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
  28  * POSSIBILITY OF SUCH DAMAGE.
  29  *
  30  * The views and conclusions contained in the software and
  31  * documentation are those of the authors and should not be
  32  * interpreted as representing official policies, either expressed
  33  * or implied, of GRNET S.A.
  34  */
  35 package gr.grnet.pithos.web.client;
  36
  37 import com.google.gwt.dom.client.NativeEvent;
  38 import com.google.gwt.event.dom.client.ClickEvent;
  39 import com.google.gwt.event.dom.client.ClickHandler;
  40 import com.google.gwt.event.dom.client.KeyCodes;
  41 import com.google.gwt.user.client.Event.NativePreviewEvent;
  42 import com.google.gwt.user.client.ui.AbstractImagePrototype;
  43 import com.google.gwt.user.client.ui.Anchor;
  44 import com.google.gwt.user.client.ui.Button;
  45 import com.google.gwt.user.client.ui.DialogBox;
  46 import com.google.gwt.user.client.ui.HTML;
  47 import com.google.gwt.user.client.ui.HasHorizontalAlignment;
  48 import com.google.gwt.user.client.ui.VerticalPanel;
  49
  50
  51 /**
  52  * A dialog for requesting confirmation from the user.
  53  */
  54 public abstract class ConfirmationDialog extends DialogBox {
  55
  56         /**
  57          * The widget's constructor.
  58          *
  59          * @param message the message to display
  60          * @param buttonLabel the label of the confirmation button
  61          */
  62         public ConfirmationDialog(String message, String buttonLabel) {
  63                 Anchor close = new Anchor("close");
  64                 close.addStyleName("close");
  65                 close.addClickHandler(new ClickHandler() {
  66
  67                         @Override
  68                         public void onClick(ClickEvent event) {
  69                                 hide();
  70                         }
  71                 });
  72                 // Set the dialog's caption.
  73                 setText("Confirmation");
  74                 setGlassEnabled(true);
  75                 setStyleName("pithos-DialogBox");
  76                 // Create a VerticalPanel to contain the label and the buttons.
  77                 VerticalPanel outer = new VerticalPanel();
  78                 outer.add(close);
  79
  80                 VerticalPanel inner = new VerticalPanel();
  81                 inner.addStyleName("inner");
  82
  83                 HTML text = new HTML("<table><tr><td rowspan='2'> " +
  84                                 AbstractImagePrototype.create(MessagePanel.images.warn()).getHTML() +
  85                                 "</td><td>" + message + "</td></tr></table>");
  86                 text.setStyleName("pithos-warnMessage");
  87                 inner.add(text);
  88                 inner.setCellHorizontalAlignment(text, HasHorizontalAlignment.ALIGN_CENTER);
  89
  90                 // Create the 'Update' button, along with a listener that hides the
  91                 // dialog when the button is clicked and renames the file.
  92                 Button ok = new Button(buttonLabel, new ClickHandler() {
  93
  94                         @Override
  95                         public void onClick(ClickEvent event) {
  96                                 confirm();
  97                                 hide();
  98                         }
  99                 });
 100                 ok.addStyleName("button");
 101                 inner.add(ok);
 102
 103                 outer.add(inner);
 104                 outer.setCellHorizontalAlignment(inner, HasHorizontalAlignment.ALIGN_CENTER);
 105                 setWidget(outer);
 106         }
 107
 108         @Override
 109         protected void onPreviewNativeEvent(NativePreviewEvent preview) {
 110                 super.onPreviewNativeEvent(preview);
 111                 NativeEvent evt = preview.getNativeEvent();
 112                 if (evt.getType().equals("keydown"))
 113                         // Use the popup's key preview hooks to close the dialog when either
 114                         // enter or escape is pressed.
 115                         switch (evt.getKeyCode()) {
 116                                 case KeyCodes.KEY_ENTER:
 117                                         hide();
 118                                         confirm();
 119                                         break;
 120                                 case KeyCodes.KEY_ESCAPE:
 121                                         hide();
 122                                         cancel();
 123                                         break;
 124                         }
 125         }
 126
 127         public abstract void confirm();
 128
 129         public abstract void cancel();
 130 }