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<h3><a name="toc">Contents</a></h3>
<ul>
<li class="level1"><a href="#walkthrough">Walkthrough</a></li>
<li class="level2"><a href="#import">Import</a></li>
<li class="level2"><a href="#rectangle-type">Rectangle Type</a></li>
<li class="level2"><a href="#text-type">Text Type</a></li>
<li class="level2"><a href="#viewing-the-example">Viewing the Example</a></li>
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<h1 class="title">QML Tutorial 1 - Basic Types</h1>
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<p>This first program is a very simple "Hello world" example that introduces some basic QML concepts. The picture below is a screenshot of this program.</p>
<p class="centerAlign"><img src="images/declarative-tutorial1.png" alt="" /></p><p>Here is the QML code for the application:</p>
<pre class="qml">
import QtQuick 2.0
Rectangle {
id: page
width: 320; height: 480
color: "lightgray"
Text {
id: helloText
text: "Hello world!"
y: 30
anchors.horizontalCenter: page.horizontalCenter
font.pointSize: 24; font.bold: true
}
}
</pre>
<a name="walkthrough"></a>
<h2 id="walkthrough">Walkthrough</h2>
<a name="import"></a>
<h3 id="import">Import</h3>
<p>First, we need to import the types that we need for this example. Most QML files will import the built-in QML types (like <a href="qml-qtquick-rectangle.html">Rectangle</a>, <a href="qml-qtquick-image.html">Image</a>, ...) that come with Qt, using:</p>
<pre class="qml">
import QtQuick 2.0
</pre>
<a name="rectangle-type"></a>
<h3 id="rectangle-type">Rectangle Type</h3>
<pre class="qml">
Rectangle {
id: page
width: 320; height: 480
color: "lightgray"
</pre>
<p>We declare a root object of type <a href="qml-qtquick-rectangle.html">Rectangle</a>. It is one of the basic building blocks you can use to create an application in QML. We give it an <code>id</code> to be able to refer to it later. In this case, we call it "page". We also set the <code>width</code>, <code>height</code> and <code>color</code> properties. The <a href="qml-qtquick-rectangle.html">Rectangle</a> type contains many other properties (such as <code>x</code> and <code>y</code>), but these are left at their default values.</p>
<a name="text-type"></a>
<h3 id="text-type">Text Type</h3>
<pre class="qml">
Text {
id: helloText
text: "Hello world!"
y: 30
anchors.horizontalCenter: page.horizontalCenter
font.pointSize: 24; font.bold: true
}
</pre>
<p>We add a <a href="qml-qtquick-text.html">Text</a> type as a child of the root Rectangle type that displays the text 'Hello world!'.</p>
<p>The <code>y</code> property is used to position the text vertically at 30 pixels from the top of its parent.</p>
<p>The <code>anchors.horizontalCenter</code> property refers to the horizontal center of an type. In this case, we specify that our text type should be horizontally centered in the <i>page</i> element (see <a href="qtquick-positioning-anchors.html">Anchor-Based Layout</a>).</p>
<p>The <code>font.pointSize</code> and <code>font.bold</code> properties are related to fonts and use the dot notation.</p>
<a name="viewing-the-example"></a>
<h3 id="viewing-the-example">Viewing the Example</h3>
<p>To view what you have created, run the qmlscene tool (located in the <code>bin</code> directory) with your filename as the first argument. For example, to run the provided completed Tutorial 1 example from the install location, you would type:</p>
<pre class="cpp">
qmlscene tutorials<span class="operator">/</span>helloworld<span class="operator">/</span>tutorial1<span class="operator">.</span>qml
</pre>
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