<!DOCTYPE HTML>
<html lang="en" class="sidebar-visible no-js light">
<head>
<!-- Book generated using mdBook -->
<meta charset="UTF-8">
<title>Memory Tile - Slint Memory Game Tutorial (node)</title>
<!-- Custom HTML head -->
<!--
This file is used to add syntax highlighting of the `.slint` snippets in the generated rustdoc, sphinx and mdbook documentation.
It can be injected via the `--html-in-header slint-docs-highlight.html` option of rustdoc, is included via _templates/layout.html
in sphinx and via head.hbs in mdbook.
-->
<link rel="stylesheet" href="https://slint.dev/resources/highlightjs/11.0.1/default.min.css">
<script src="https://slint.dev/resources/highlightjs/11.0.1/highlight.min.js"></script>
<script>
function highlight_slint(hljs) {
const KEYWORDS = {
keyword:
"animate callback component export for function global if import in in-out inherits out parent private property public pure root self signal states struct transitions",
literal: "false true",
built_in:
"ArcTo Clip Close Colors CubicTo Flickable FocusScope GridLayout HorizontalLayout Image LineTo Math MoveTo Path PopupWindow QuadraticTo Rectangle Row Text TextInput TouchArea VerticalLayout Window animation-tick debug",
type: "bool duration easing float int length logical_length relative-font-size resource string",
};
return {
name: 'slint',
case_insensitive: false,
keywords: KEYWORDS,
contains: [
hljs.QUOTE_STRING_MODE,
hljs.C_LINE_COMMENT_MODE,
hljs.C_BLOCK_COMMENT_MODE,
hljs.COMMENT('/\\*', '\\*/', {
contains: ['self']
}),
{
className: 'number',
begin: '\\b\\d+(\\.\\d+)?(\\w+)?',
relevance: 0
},
{
className: 'title',
begin: '\\b[_a-zA-Z][_\\-a-zA-Z0-9]* *:=',
},
{
className: 'symbol',
begin: '\\b[_a-zA-Z][_\\-a-zA-Z0-9]*(:| *=>)',
},
{
className: 'built_in',
begin: '\\b[_a-zA-Z][_\\-a-zA-Z0-9]*!',
},
],
illegal: /@/
};
};
// Tags used in fenced code blocks
for (let tag of ["slint", "slint,no-preview", "slint,no-auto-preview", "slint,ignore"]) {
hljs.registerLanguage(tag, highlight_slint);
}
window.addEventListener("DOMContentLoaded", () => {
const rustDoc = document.querySelector('meta[name="generator"]')?.content == "rustdoc";
if (rustDoc) {
// Only highlight .slint blocks, leave the others to rustdoc
for (slintBlock of document.querySelectorAll("[class*=language-slint]")) {
hljs.highlightElement(slintBlock)
}
// Some of the rustdoc selectors require the pre element to have the rust class
for (codeBlock of document.querySelectorAll(".language-slint.hljs")) {
codeBlock.parentElement.classList.add("rust")
}
// Change the hljs generated classes to the rustdoc
// ones, so that the highlighting adjusts to the theme correctly.
const highlightJSToRustDoc = [
["comment", "comment"],
["number", "number"],
["symbol", "struct"], // width:
["keyword", "kw"],
["built_in", "primitive"],
["string", "string"],
["title", "fnname"], // Foo :=
["type", "type"]
];
for ([hljs_class, rustdoc_class] of highlightJSToRustDoc) {
for (titleElement of document.querySelectorAll(`.hljs-${hljs_class}`)) {
titleElement.classList.remove(`hljs-${hljs_class}`);
titleElement.classList.add(rustdoc_class);
}
}
} else {
// For use with the mdbook Tutorial
hljs.highlightAll();
// The Sphinx/my_st generated HTML for code blocks doesn't use <code> tags, so highlight.js'
// default selector "pre code" doesn't match. Let's do it by hand:
for (block of document.querySelectorAll("div[class*=highlight-slint] div.highlight pre")) {
hljs.highlightElement(block)
}
}
});
</script>
<meta name="description" content="">
<meta name="viewport" content="width=device-width, initial-scale=1">
<meta name="theme-color" content="#ffffff" />
<link rel="icon" href="favicon.svg">
<link rel="shortcut icon" href="favicon.png">
<link rel="stylesheet" href="css/variables.css">
<link rel="stylesheet" href="css/general.css">
<link rel="stylesheet" href="css/chrome.css">
<link rel="stylesheet" href="css/print.css" media="print">
<!-- Fonts -->
<link rel="stylesheet" href="FontAwesome/css/font-awesome.css">
<link rel="stylesheet" href="fonts/fonts.css">
<!-- Highlight.js Stylesheets -->
<link rel="stylesheet" href="highlight.css">
<link rel="stylesheet" href="tomorrow-night.css">
<link rel="stylesheet" href="ayu-highlight.css">
<!-- Custom theme stylesheets -->
</head>
<body>
<div id="body-container">
<!-- Provide site root to javascript -->
<script>
var path_to_root = "";
var default_theme = window.matchMedia("(prefers-color-scheme: dark)").matches ? "navy" : "light";
</script>
<!-- Work around some values being stored in localStorage wrapped in quotes -->
<script>
try {
var theme = localStorage.getItem('mdbook-theme');
var sidebar = localStorage.getItem('mdbook-sidebar');
if (theme.startsWith('"') && theme.endsWith('"')) {
localStorage.setItem('mdbook-theme', theme.slice(1, theme.length - 1));
}
if (sidebar.startsWith('"') && sidebar.endsWith('"')) {
localStorage.setItem('mdbook-sidebar', sidebar.slice(1, sidebar.length - 1));
}
} catch (e) { }
</script>
<!-- Set the theme before any content is loaded, prevents flash -->
<script>
var theme;
try { theme = localStorage.getItem('mdbook-theme'); } catch(e) { }
if (theme === null || theme === undefined) { theme = default_theme; }
var html = document.querySelector('html');
html.classList.remove('no-js')
html.classList.remove('light')
html.classList.add(theme);
html.classList.add('js');
</script>
<!-- Hide / unhide sidebar before it is displayed -->
<script>
var html = document.querySelector('html');
var sidebar = null;
if (document.body.clientWidth >= 1080) {
try { sidebar = localStorage.getItem('mdbook-sidebar'); } catch(e) { }
sidebar = sidebar || 'visible';
} else {
sidebar = 'hidden';
}
html.classList.remove('sidebar-visible');
html.classList.add("sidebar-" + sidebar);
</script>
<nav id="sidebar" class="sidebar" aria-label="Table of contents">
<div class="sidebar-scrollbox">
<ol class="chapter"><li class="chapter-item expanded "><a href="introduction.html"><strong aria-hidden="true">1.</strong> Introduction</a></li><li class="chapter-item expanded "><a href="getting_started.html"><strong aria-hidden="true">2.</strong> Getting Started</a></li><li class="chapter-item expanded "><a href="memory_tile.html" class="active"><strong aria-hidden="true">3.</strong> Memory Tile</a></li><li class="chapter-item expanded "><a href="polishing_the_tile.html"><strong aria-hidden="true">4.</strong> Polishing the Tile</a></li><li class="chapter-item expanded "><a href="from_one_to_multiple_tiles.html"><strong aria-hidden="true">5.</strong> From One To Multiple Tiles</a></li><li class="chapter-item expanded "><a href="creating_the_tiles_from_js.html"><strong aria-hidden="true">6.</strong> Creating The Tiles From JavaScript</a></li><li class="chapter-item expanded "><a href="game_logic_in_js.html"><strong aria-hidden="true">7.</strong> Game Logic In JavaScript</a></li><li class="chapter-item expanded "><a href="ideas_for_the_reader.html"><strong aria-hidden="true">8.</strong> Ideas For The Reader</a></li><li class="chapter-item expanded "><a href="conclusion.html"><strong aria-hidden="true">9.</strong> Conclusion</a></li></ol>
</div>
<div id="sidebar-resize-handle" class="sidebar-resize-handle"></div>
</nav>
<div id="page-wrapper" class="page-wrapper">
<div class="page">
<div id="menu-bar-hover-placeholder"></div>
<div id="menu-bar" class="menu-bar sticky bordered">
<div class="left-buttons">
<button id="sidebar-toggle" class="icon-button" type="button" title="Toggle Table of Contents" aria-label="Toggle Table of Contents" aria-controls="sidebar">
<i class="fa fa-bars"></i>
</button>
<button id="theme-toggle" class="icon-button" type="button" title="Change theme" aria-label="Change theme" aria-haspopup="true" aria-expanded="false" aria-controls="theme-list">
<i class="fa fa-paint-brush"></i>
</button>
<ul id="theme-list" class="theme-popup" aria-label="Themes" role="menu">
<li role="none"><button role="menuitem" class="theme" id="light">Light</button></li>
<li role="none"><button role="menuitem" class="theme" id="rust">Rust</button></li>
<li role="none"><button role="menuitem" class="theme" id="coal">Coal</button></li>
<li role="none"><button role="menuitem" class="theme" id="navy">Navy</button></li>
<li role="none"><button role="menuitem" class="theme" id="ayu">Ayu</button></li>
</ul>
<button id="search-toggle" class="icon-button" type="button" title="Search. (Shortkey: s)" aria-label="Toggle Searchbar" aria-expanded="false" aria-keyshortcuts="S" aria-controls="searchbar">
<i class="fa fa-search"></i>
</button>
</div>
<h1 class="menu-title">Slint Memory Game Tutorial (node)</h1>
<div class="right-buttons">
<a href="print.html" title="Print this book" aria-label="Print this book">
<i id="print-button" class="fa fa-print"></i>
</a>
</div>
</div>
<div id="search-wrapper" class="hidden">
<form id="searchbar-outer" class="searchbar-outer">
<input type="search" id="searchbar" name="searchbar" placeholder="Search this book ..." aria-controls="searchresults-outer" aria-describedby="searchresults-header">
</form>
<div id="searchresults-outer" class="searchresults-outer hidden">
<div id="searchresults-header" class="searchresults-header"></div>
<ul id="searchresults">
</ul>
</div>
</div>
<!-- Apply ARIA attributes after the sidebar and the sidebar toggle button are added to the DOM -->
<script>
document.getElementById('sidebar-toggle').setAttribute('aria-expanded', sidebar === 'visible');
document.getElementById('sidebar').setAttribute('aria-hidden', sidebar !== 'visible');
Array.from(document.querySelectorAll('#sidebar a')).forEach(function(link) {
link.setAttribute('tabIndex', sidebar === 'visible' ? 0 : -1);
});
</script>
<div id="content" class="content">
<main>
<!-- Copyright © SixtyFPS GmbH <info@slint.dev> ; SPDX-License-Identifier: MIT -->
<h1 id="memory-tile"><a class="header" href="#memory-tile">Memory Tile</a></h1>
<p>With the skeleton in place, let's look at the first element of the game, the memory tile. It will be the
visual building block that consists of an underlying filled rectangle background, the icon image. Later we'll add a
covering rectangle that acts as a curtain. The background rectangle is declared to be 64 logical pixels wide and tall,
and it's filled with a soothing tone of blue. Note how lengths in the <code>.slint</code> language have a unit, here
the <code>px</code> suffix. That makes the code easier to read and the compiler can detect when your are accidentally
mixing values with different units attached to them.</p>
<p>We copy the following code into the <code>memory.slint</code> file:</p>
<pre><code class="language-slint">component MemoryTile inherits Rectangle {
width: 64px;
height: 64px;
background: #3960D5;
Image {
source: @image-url("icons/bus.png");
width: parent.width;
height: parent.height;
}
}
export component MainWindow inherits Window {
MemoryTile {}
}
</code></pre>
<p>Note that we export the <span class="hljs-title">MainWindow</span> component. This is necessary so that we can later access it
from our business logic.</p>
<p>Inside the <span class="hljs-built_in">Rectangle</span> we place an <span class="hljs-built_in">Image</span> element that
loads an icon with the <span class="hljs-built_in">@image-url()</span> macro. The path is relative to the folder in which
the <code>memory.slint</code> is located. This icon and others we're going to use later need to be installed first. You can download a
<a href="https://slint.dev/blog/memory-game-tutorial/icons.zip">Zip archive</a> that we have prepared.</p>
<p>If you are on Linux or macOS, download and extract it with the following two commands:</p>
<pre><code class="language-sh">curl -O https://slint.dev/blog/memory-game-tutorial/icons.zip
unzip icons.zip
</code></pre>
<p>If you are on Windows, use the following commands:</p>
<pre><code>powershell curl -Uri https://slint.dev/blog/memory-game-tutorial/icons.zip -Outfile icons.zip
powershell Expand-Archive -Path icons.zip -DestinationPath .
</code></pre>
<p>This should unpack an <code>icons</code> directory containing a bunch of icons.</p>
<p>We running the program with <code>npm start</code> and it gives us a window on the screen that shows the icon of a bus on a blue background.</p>
<p><img src="https://slint.dev/blog/memory-game-tutorial/memory-tile.png" alt="Screenshot of the first tile" title="Memory Tile Screenshot" /></p>
</main>
<nav class="nav-wrapper" aria-label="Page navigation">
<!-- Mobile navigation buttons -->
<a rel="prev" href="getting_started.html" class="mobile-nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
<i class="fa fa-angle-left"></i>
</a>
<a rel="next" href="polishing_the_tile.html" class="mobile-nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
<i class="fa fa-angle-right"></i>
</a>
<div style="clear: both"></div>
</nav>
</div>
</div>
<nav class="nav-wide-wrapper" aria-label="Page navigation">
<a rel="prev" href="getting_started.html" class="nav-chapters previous" title="Previous chapter" aria-label="Previous chapter" aria-keyshortcuts="Left">
<i class="fa fa-angle-left"></i>
</a>
<a rel="next" href="polishing_the_tile.html" class="nav-chapters next" title="Next chapter" aria-label="Next chapter" aria-keyshortcuts="Right">
<i class="fa fa-angle-right"></i>
</a>
</nav>
</div>
<script>
window.playground_copyable = true;
</script>
<script src="elasticlunr.min.js"></script>
<script src="mark.min.js"></script>
<script src="searcher.js"></script>
<script src="clipboard.min.js"></script>
<script src="highlight.js"></script>
<script src="book.js"></script>
<!-- Custom JS scripts -->
</div>
</body>
</html>
