com.google.appengine.demos.gwtdlx.client.GwtDlx.java Source code

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Here is the source code for com.google.appengine.demos.gwtdlx.client.GwtDlx.java

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/*
 * Copyright 2009 Google Inc.
 * 
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 * 
 * http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */

package com.google.appengine.demos.gwtdlx.client;

import com.google.gwt.core.client.EntryPoint;
import com.google.gwt.core.client.GWT;
import com.google.gwt.dom.client.Document;
import com.google.gwt.dom.client.InputElement;
import com.google.gwt.event.dom.client.ClickEvent;
import com.google.gwt.event.dom.client.ClickHandler;
import com.google.gwt.user.client.rpc.AsyncCallback;
import com.google.gwt.user.client.ui.Button;
import com.google.gwt.user.client.ui.HTML;
import com.google.gwt.user.client.ui.Label;
import com.google.gwt.user.client.ui.RootPanel;

/**
 * Entry point classes define <code>onModuleLoad()</code>.
 */
public class GwtDlx implements EntryPoint {
    private final Label ajax = new Label("ajax: the cloud is thinking.");
    private final SudokuApiAsync api = GWT.create(SudokuApi.class);
    private final HTML noSolution = new HTML("&empty;");

    public void onModuleLoad() {
        Button button = new Button("solve");
        Button clearButton = new Button("clear");

        button.addClickHandler(buildClickHandler());
        clearButton.addClickHandler(buildClearHandler());

        RootPanel.get("button").add(button);
        RootPanel.get("button").add(clearButton);

        noSolution.setVisible(false);
        noSolution.setStyleName("fail");

        RootPanel.get().add(noSolution);
        RootPanel.get().add(ajax);
        ajax.setStyleName("ajax");
        ajax.setVisible(false);
        ajax.setHorizontalAlignment(Label.ALIGN_CENTER);
        noSolution.setHorizontalAlignment(Label.ALIGN_CENTER);
    }

    private ClickHandler buildClearHandler() {
        ClickHandler out = new ClickHandler() {
            public void onClick(ClickEvent event) {
                noSolution.setVisible(false);
                for (int r = 0; r < 9; r++) {
                    for (int c = 0; c < 9; c++) {
                        InputElement elt = getBox(r, c);
                        elt.setValue("");
                    }
                }
            }
        };
        return out;
    }

    private ClickHandler buildClickHandler() {
        ClickHandler out = new ClickHandler() {
            public void onClick(ClickEvent event) {
                ajax.setVisible(true);
                int board[][] = new int[9][9];

                for (int r = 0; r < 9; r++) {
                    for (int c = 0; c < 9; c++) {
                        InputElement elt = getBox(r, c);

                        int val = 0;
                        String str = elt.getValue();
                        if (str.length() == 1 && Character.isDigit(str.charAt(0))) {
                            val = str.charAt(0) - '0';
                        }

                        board[r][c] = val;
                    }
                }
                api.solveSudoku(board, buildCallback());
            }
        };
        return out;
    }

    private InputElement getBox(int r, int c) {
        String cellname = "cell" + r + "" + c;
        InputElement elt = (InputElement) Document.get().getElementById(cellname);

        return elt;
    }

    private AsyncCallback<int[][]> buildCallback() {
        AsyncCallback<int[][]> out = new AsyncCallback<int[][]>() {
            public void onFailure(Throwable caught) {
            }

            public void onSuccess(int[][] result) {
                ajax.setVisible(false);
                if (result == null) {
                    noSolution.setVisible(true);
                    return;
                }

                noSolution.setVisible(false);
                for (int r = 0; r < result.length; r++) {
                    for (int c = 0; c < result[r].length; c++) {
                        InputElement elt = getBox(r, c);
                        elt.setValue(result[r][c] + "");
                    }
                }
                ajax.setVisible(false);
            }
        };
        return out;
    }
}