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<?xml version="1.0" encoding="UTF-8"?>
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<title>Qt 4.8: HighScoreModel.qml Example File (demos/declarative/snake/qml/snake/content/HighScoreModel.qml)</title>
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<h1 class="title">HighScoreModel.qml Example File</h1>
<span class="small-subtitle">demos/declarative/snake/qml/snake/content/HighScoreModel.qml</span>
<!-- $$$demos/declarative/snake/qml/snake/content/HighScoreModel.qml-description -->
<div class="descr"> <a name="details"></a>
<pre class="qml"> <span class="comment">/****************************************************************************
**
** Copyright (C) 2012 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.
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** GNU Lesser General Public License Usage
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**
****************************************************************************/</span>
import QtQuick 1.0
<span class="comment">// Models a high score table.</span>
//
<span class="comment">// Use this component like this:</span>
//
<span class="comment">// HighScoreModel {</span>
<span class="comment">// id: highScores</span>
<span class="comment">// game: "MyCoolGame"</span>
<span class="comment">// }</span>
//
<span class="comment">// Then use either use the top-score properties:</span>
//
<span class="comment">// Text { text: "HI: " + highScores.topScore }</span>
//
<span class="comment">// or, use the model in a view:</span>
//
<span class="comment">// ListView {</span>
<span class="comment">// model: highScore</span>
<span class="comment">// delegate: Component {</span>
<span class="comment">// ... player ... score ...</span>
<span class="comment">// }</span>
<span class="comment">// }</span>
//
<span class="comment">// Add new scores via:</span>
//
<span class="comment">// saveScore(newScore)</span>
//
<span class="comment">// or:</span>
//
<span class="comment">// savePlayerScore(playerName,newScore)</span>
//
<span class="comment">// The best maxScore scores added by this method will be retained in an SQL database,</span>
<span class="comment">// and presented in the model and in the topScore/topPlayer properties.</span>
//
<span class="type"><a href="qml-listmodel.html">ListModel</a></span> {
<span class="name">id</span>: <span class="name">model</span>
property <span class="type">string</span> <span class="name">game</span>: <span class="string">""</span>
property <span class="type">int</span> <span class="name">topScore</span>: <span class="number">0</span>
property <span class="type">string</span> <span class="name">topPlayer</span>: <span class="string">""</span>
property <span class="type">int</span> <span class="name">maxScores</span>: <span class="number">10</span>
<span class="keyword">function</span> <span class="name">__db</span>()
{
<span class="keyword">return</span> <span class="name">openDatabaseSync</span>(<span class="string">"HighScoreModel"</span>, <span class="string">"1.0"</span>, <span class="string">"Generic High Score Functionality for QML"</span>, <span class="number">1000000</span>);
}
<span class="keyword">function</span> <span class="name">__ensureTables</span>(<span class="name">tx</span>)
{
<span class="name">tx</span>.<span class="name">executeSql</span>(<span class="string">'CREATE TABLE IF NOT EXISTS HighScores(game TEXT, score INT, player TEXT)'</span>, []);
}
<span class="keyword">function</span> <span class="name">fillModel</span>() {
<span class="name">__db</span>().<span class="name">transaction</span>(
<span class="keyword">function</span>(<span class="name">tx</span>) {
<span class="name">__ensureTables</span>(<span class="name">tx</span>);
var <span class="name">rs</span> = <span class="name">tx</span>.<span class="name">executeSql</span>(<span class="string">"SELECT score,player FROM HighScores WHERE game=? ORDER BY score DESC"</span>, [<span class="name">game</span>]);
<span class="name">model</span>.<span class="name">clear</span>();
<span class="keyword">if</span> (<span class="name">rs</span>.<span class="name">rows</span>.<span class="name">length</span> <span class="operator">></span> <span class="number">0</span>) {
<span class="name">topScore</span> <span class="operator">=</span> <span class="name">rs</span>.<span class="name">rows</span>.<span class="name">item</span>(<span class="number">0</span>).<span class="name">score</span>
<span class="name">topPlayer</span> <span class="operator">=</span> <span class="name">rs</span>.<span class="name">rows</span>.<span class="name">item</span>(<span class="number">0</span>).<span class="name">player</span>
<span class="keyword">for</span> (<span class="keyword">var</span> <span class="name">i</span>=<span class="number">0</span>; <span class="name">i</span><span class="operator"><</span><span class="name">rs</span>.<span class="name">rows</span>.<span class="name">length</span>; ++<span class="name">i</span>) {
<span class="keyword">if</span> (<span class="name">i</span> <span class="operator"><</span> <span class="name">maxScores</span>)
<span class="name">model</span>.<span class="name">append</span>(<span class="name">rs</span>.<span class="name">rows</span>.<span class="name">item</span>(<span class="name">i</span>))
}
<span class="keyword">if</span> (<span class="name">rs</span>.<span class="name">rows</span>.<span class="name">length</span> <span class="operator">></span> <span class="name">maxScores</span>)
<span class="name">tx</span>.<span class="name">executeSql</span>(<span class="string">"DELETE FROM HighScores WHERE game=? AND score <= ?"</span>,
[<span class="name">game</span>, <span class="name">rs</span>.<span class="name">rows</span>.<span class="name">item</span>(<span class="name">maxScores</span>).<span class="name">score</span>]);
}
}
)
}
<span class="keyword">function</span> <span class="name">savePlayerScore</span>(<span class="name">player</span>,score) {
<span class="name">__db</span>().<span class="name">transaction</span>(
<span class="keyword">function</span>(<span class="name">tx</span>) {
<span class="name">__ensureTables</span>(<span class="name">tx</span>);
<span class="name">tx</span>.<span class="name">executeSql</span>(<span class="string">"INSERT INTO HighScores VALUES(?,?,?)"</span>, [<span class="name">game</span>,<span class="name">score</span>,<span class="name">player</span>]);
<span class="name">fillModel</span>();
}
)
}
<span class="keyword">function</span> <span class="name">saveScore</span>(<span class="name">score</span>) {
<span class="name">savePlayerScore</span>(<span class="string">"player"</span>,<span class="name">score</span>);
}
<span class="keyword">function</span> <span class="name">clearScores</span>() {
<span class="name">__db</span>().<span class="name">transaction</span>(
<span class="keyword">function</span>(<span class="name">tx</span>) {
<span class="name">tx</span>.<span class="name">executeSql</span>(<span class="string">"DELETE FROM HighScores WHERE game=?"</span>, [<span class="name">game</span>]);
<span class="name">fillModel</span>();
}
)
}
<span class="name">Component</span>.onCompleted: { <span class="name">fillModel</span>() }
}</pre>
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<!-- @@@demos/declarative/snake/qml/snake/content/HighScoreModel.qml -->
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