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.. _qmlbasictypes:
QML Tutorial 1 - Basic Types
****************************
This first program is a very simple "Hello world" example that introduces some basic QML concepts.
The following image is a screenshot of this program.
.. figure:: declarative-tutorial1.png
:align: center
Here is the QML code for the application:
.. pysideinclude:: helloworld/tutorial1.qml
:snippet: 0
Walkthrough
===========
Import
------
First, you need to import the types that are required for this example. Most QML files import the built-in QML
types (like Rectangle, Image, ...) that come with Qt, using the following statement:
.. pysideinclude:: helloworld/tutorial1.qml
:snippet: 3
Rectangle element
-----------------
.. pysideinclude:: helloworld/tutorial1.qml
:snippet: 1
Declare a root element using the Rectangle type, which is one of the basic building blocks to create an application in QML.
Give it an ``id`` so that you can refer to it later. For example, call it "page", and also set its ``width``,
``height``, and ``color`` properties.
Text element
------------
.. pysideinclude code/tutorial1.qml
:snippet: 2
Add a Text element as the child of the Rectangle element to display the text, 'Hello world!'.
Use its ``y`` property to position it at 30 pixels from the top of its parent.
The ``anchors.horizontalCenter`` property refers to the horizontal center of an element.
In this case, specify that the text element must be horizontally centered in the *page* element.
The ``font.pointSize`` and ``font.bold properties`` are related to fonts and use the dot notation.
Viewing the example
-------------------
To view what you have created, run the ``qmlscene`` tool (located in the ``bin directory`` of your Qt installation) with your
QML filename as the first argument. For example, to run the Tutorial 1 example from the install
location, you would type:
::
> [QT_INSTALL_DIR]\bin\qmlscene tutorial1.qml
[Previous :ref:`qmltutorial`][Next :ref:`qmlcomponents`]
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