Synnefo » Pithos Web Client

/*

 *  Copyright (c) 2011 Greek Research and Technology Network

 */

package gr.grnet.pithos.web.client;

import com.google.gwt.dom.client.NativeEvent;

import com.google.gwt.event.dom.client.ClickEvent;

import com.google.gwt.event.dom.client.ClickHandler;

import com.google.gwt.event.dom.client.KeyCodes;

import com.google.gwt.user.client.Event.NativePreviewEvent;

import com.google.gwt.user.client.ui.AbstractImagePrototype;

import com.google.gwt.user.client.ui.Button;

import com.google.gwt.user.client.ui.DialogBox;

import com.google.gwt.user.client.ui.HTML;

import com.google.gwt.user.client.ui.HasHorizontalAlignment;

import com.google.gwt.user.client.ui.HorizontalPanel;

import com.google.gwt.user.client.ui.VerticalPanel;

/**

 * A dialog for requesting confirmation from the user.

 */

public abstract class ConfirmationDialog extends DialogBox {

        /**

         * The widget's constructor.

         *

         * @param message the message to display

         * @param buttonLabel the label of the confirmation button

         */

        public ConfirmationDialog(String message, String buttonLabel) {

                // Set the dialog's caption.

                setText("Confirmation");

                setAnimationEnabled(true);

                // Create a VerticalPanel to contain the label and the buttons.

                VerticalPanel outer = new VerticalPanel();

                HorizontalPanel buttons = new HorizontalPanel();

                HTML text = new HTML("<table><tr><td rowspan='2'> " +

                                AbstractImagePrototype.create(MessagePanel.images.warn()).getHTML() +

                                "</td><td>" + message + "</td></tr></table>");

                text.setStyleName("pithos-warnMessage");

                outer.add(text);

                // Create the 'Update' button, along with a listener that hides the

                // dialog when the button is clicked and renames the file.

                Button ok = new Button(buttonLabel, new ClickHandler() {

                        @Override

                        public void onClick(ClickEvent event) {

                                confirm();

                                hide();

                        }

                });

                ok.getElement().setId("confirmation.ok");

                buttons.add(ok);

                buttons.setCellHorizontalAlignment(ok, HasHorizontalAlignment.ALIGN_CENTER);

                // Create the 'Cancel' button, along with a listener that hides the

                // dialog when the button is clicked.

                Button cancel = new Button("Cancel", new ClickHandler() {

                        @Override

                        public void onClick(ClickEvent event) {

                                hide();

                                cancel();

                        }

                });

                cancel.getElement().setId("confirmation.cancel");

                buttons.add(cancel);

                buttons.setCellHorizontalAlignment(cancel, HasHorizontalAlignment.ALIGN_CENTER);

                buttons.setSpacing(8);

                buttons.setStyleName("pithos-warnMessage");

                outer.setStyleName("pithos-warnMessage");

                outer.add(buttons);

                outer.setCellHorizontalAlignment(text, HasHorizontalAlignment.ALIGN_CENTER);

                outer.setCellHorizontalAlignment(buttons, HasHorizontalAlignment.ALIGN_CENTER);

                setWidget(outer);

        }

        @Override

        protected void onPreviewNativeEvent(NativePreviewEvent preview) {

                super.onPreviewNativeEvent(preview);

                NativeEvent evt = preview.getNativeEvent();

                if (evt.getType().equals("keydown"))

                        // Use the popup's key preview hooks to close the dialog when either

                        // enter or escape is pressed.

                        switch (evt.getKeyCode()) {

                                case KeyCodes.KEY_ENTER:

                                        hide();

                                        confirm();

                                        break;

                                case KeyCodes.KEY_ESCAPE:

                                        hide();

                                        cancel();

                                        break;

                        }

        }

        public abstract void confirm();

        public abstract void cancel();

}