org.gss_project.gss.web.client.ConfirmationDialog.java Source code

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Here is the source code for org.gss_project.gss.web.client.ConfirmationDialog.java

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/*
 * Copyright 2009 Electronic Business Systems Ltd.
 *
 * This file is part of GSS.
 *
 * GSS is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 * (at your option) any later version.
 *
 * GSS is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with GSS.  If not, see <http://www.gnu.org/licenses/>.
 */
package org.gss_project.gss.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.
 *
 * @author kman
 */
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("gss-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("gss-warnMessage");
        outer.setStyleName("gss-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();
}