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Diffstat (limited to 'demos/declarative/snake/content/HighScoreModel.qml')
-rw-r--r-- | demos/declarative/snake/content/HighScoreModel.qml | 139 |
1 files changed, 139 insertions, 0 deletions
diff --git a/demos/declarative/snake/content/HighScoreModel.qml b/demos/declarative/snake/content/HighScoreModel.qml new file mode 100644 index 0000000000..b46e564183 --- /dev/null +++ b/demos/declarative/snake/content/HighScoreModel.qml @@ -0,0 +1,139 @@ +/**************************************************************************** +** +** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies). +** All rights reserved. +** Contact: Nokia Corporation (qt-info@nokia.com) +** +** This file is part of the QtDeclarative module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** No Commercial Usage +** This file contains pre-release code and may not be distributed. +** You may use this file in accordance with the terms and conditions +** contained in the Technology Preview License Agreement accompanying +** this package. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 2.1 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 2.1 requirements +** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html. +** +** In addition, as a special exception, Nokia gives you certain additional +** rights. These rights are described in the Nokia Qt LGPL Exception +** version 1.1, included in the file LGPL_EXCEPTION.txt in this package. +** +** If you have questions regarding the use of this file, please contact +** Nokia at qt-info@nokia.com. +** +** +** +** +** +** +** +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +import QtQuick 1.0 + +// Models a high score table. +// +// Use this component like this: +// +// HighScoreModel { +// id: highScores +// game: "MyCoolGame" +// } +// +// Then use either use the top-score properties: +// +// Text { text: "HI: " + highScores.topScore } +// +// or, use the model in a view: +// +// ListView { +// model: highScore +// delegate: Component { +// ... player ... score ... +// } +// } +// +// Add new scores via: +// +// saveScore(newScore) +// +// or: +// +// savePlayerScore(playerName,newScore) +// +// The best maxScore scores added by this method will be retained in an SQL database, +// and presented in the model and in the topScore/topPlayer properties. +// + +ListModel { + id: model + property string game: "" + property int topScore: 0 + property string topPlayer: "" + property int maxScores: 10 + + function __db() + { + return openDatabaseSync("HighScoreModel", "1.0", "Generic High Score Functionality for QML", 1000000); + } + function __ensureTables(tx) + { + tx.executeSql('CREATE TABLE IF NOT EXISTS HighScores(game TEXT, score INT, player TEXT)', []); + } + + function fillModel() { + __db().transaction( + function(tx) { + __ensureTables(tx); + var rs = tx.executeSql("SELECT score,player FROM HighScores WHERE game=? ORDER BY score DESC", [game]); + model.clear(); + if (rs.rows.length > 0) { + topScore = rs.rows.item(0).score + topPlayer = rs.rows.item(0).player + for (var i=0; i<rs.rows.length; ++i) { + if (i < maxScores) + model.append(rs.rows.item(i)) + } + if (rs.rows.length > maxScores) + tx.executeSql("DELETE FROM HighScores WHERE game=? AND score <= ?", + [game, rs.rows.item(maxScores).score]); + } + } + ) + } + + function savePlayerScore(player,score) { + __db().transaction( + function(tx) { + __ensureTables(tx); + tx.executeSql("INSERT INTO HighScores VALUES(?,?,?)", [game,score,player]); + fillModel(); + } + ) + } + + function saveScore(score) { + savePlayerScore("player",score); + } + + function clearScores() { + __db().transaction( + function(tx) { + tx.executeSql("DELETE FROM HighScores WHERE game=?", [game]); + fillModel(); + } + ) + } + + Component.onCompleted: { fillModel() } +} |