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<td ><a href="index.html">Qt 5.12</a></td><td >Getting Started Programming with Qt Quick</td></tr></table><table class="buildversion"><tr>
<td id="buildversion" width="100%" align="right">Qt 5.12.6 Reference Documentation</td>
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<h3><a name="toc">Contents</a></h3>
<ul>
<li class="level1"><a href="#creating-the-alarms-project">Creating the Alarms Project</a></li>
<li class="level1"><a href="#qt-creator">Qt Creator</a></li>
<li class="level1"><a href="#additional-source-files">Additional source files</a></li>
<li class="level2"><a href="#qtquickcontrols2-op-op-conf"><code>qtquickcontrols2.conf</code></a></li>
<li class="level2"><a href="#main-op-op-qml"><code>main.qml</code></a></li>
<li class="level2"><a href="#alarmdialog-op-op-qml"><code>AlarmDialog.qml</code></a></li>
<li class="level2"><a href="#alarmdelegate-op-op-qml"><code>AlarmDelegate.qml</code></a></li>
<li class="level2"><a href="#alarmmodel-op-op-qml"><code>AlarmModel.qml</code></a></li>
<li class="level2"><a href="#tumblerdelegate-qml">TumblerDelegate.qml</a></li>
<li class="level1"><a href="#entering-new-alarms">Entering new alarms</a></li>
<li class="level1"><a href="#editing-alarms">Editing alarms</a></li>
<li class="level1"><a href="#deleting-alarms">Deleting alarms</a></li>
<li class="level2"><a href="#summary">Summary</a></li>
</ul>
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<div class="sidebar-content" id="sidebar-content"></div></div>
<h1 class="title">Getting Started Programming with Qt Quick</h1>
<span class="subtitle"></span>
<!-- $$$tutorials/alarms-brief -->
<p>A tutorial for Qt Quick based on an alarms application.</p>
<!-- @@@tutorials/alarms -->
<!-- $$$tutorials/alarms-description -->
<div class="descr"> <a name="details"></a>
<p>This tutorial shows how to develop a simple alarm application as an introduction to Qt Quick and Qt Quick Controls2.</p>
<p>This application is similar to the alarm application usually found on an Android phone. Its features let you enter, edit, or delete alarms. An alarm can trigger on a given date, and you can set it to repeat on a series of subsequent days.</p>
<p>The main screen shows the list of saved alarms:</p>
<p class="centerAlign"><img src="images/mainscreen.png" alt=""Alarms application"" /></p><p>The detail screen lets you edit or delete existing alarms:</p>
<p class="centerAlign"><img src="images/detailscreen.png" alt=""Detail screen"" /></p><p>The dialog screen is used for adding new alarms. It pops up when you click on the "+" RoundButton on the bottom of the main screen:</p>
<p class="centerAlign"><img src="images/addalarms.png" alt=""Add alarms"" /></p><p>The source files are located in the qtdoc repository. You can either fetch the Qt 5 sources from the Qt Project, or install them as part of Qt 5. The application is also available in the example list of Qt Creator's Welcome mode.</p>
<a name="creating-the-alarms-project"></a>
<h2 id="creating-the-alarms-project">Creating the Alarms Project</h2>
<p>This section shows how to create the project in Qt Creator. It discusses the files generated automatically by Qt Creator, and the two files the programmer has to create in Qt Creator or some other editor. The latter two files are included with the source code for this tutorial.</p>
<a name="qt-creator"></a>
<h2 id="qt-creator">Qt Creator</h2>
<p>Setting up a new project in Qt Creator is aided by a wizard that guides you step-by-step through the project creation process. The wizard prompts you to enter the settings needed for that particular type of project and creates the project for you.</p>
<p>To create the Alarms project, select <b>File</b> > <b>New File or Project</b> > <b>Application</b> > <b>Qt Quick Application - Empty</b> > <b>Choose</b>. Type "alarms" in the <b>Name</b> field, and follow the instructions of the wizard.</p>
<p class="centerAlign"><img src="images/alarms2.png" alt=""Qt Creator New File or Project dialog"" /></p><p class="centerAlign"><img src="images/alarms3.png" alt=""Project Location"" /></p><p>The Qt Quick application wizard creates a project that contains the following source files:</p>
<div class="table"><table class="generic">
<thead><tr class="qt-style"><th >Source file</th><th >Purpose</th></tr></thead>
<tr valign="top" class="odd"><td >alarms.pro</td><td >The project file</td></tr>
<tr valign="top" class="even"><td >main.cpp</td><td >The main C++ code file for the application.</td></tr>
<tr valign="top" class="odd"><td >qml.qrc</td><td >The resource file, which contains the names of the source files, except main.cpp and the project file.</td></tr>
</table></div>
<p>The wizard generates the code in the main.cpp file below. This code block enables High DPI scaling and declares <code>app</code> and <code>engine</code>. The engine then loads our main QML file.</p>
<pre class="cpp">
<span class="type">int</span> main(<span class="type">int</span> argc<span class="operator">,</span> <span class="type">char</span> <span class="operator">*</span>argv<span class="operator">[</span><span class="operator">]</span>)
{
<span class="type">QCoreApplication</span><span class="operator">::</span>setAttribute(<span class="type">Qt</span><span class="operator">::</span>AA_EnableHighDpiScaling);
<span class="type">QGuiApplication</span> app(argc<span class="operator">,</span> argv);
<span class="type">QQmlApplicationEngine</span> engine;
engine<span class="operator">.</span>load(<span class="type">QUrl</span>(<span class="type">QStringLiteral</span>(<span class="string">"qrc:/main.qml"</span>)));
<span class="keyword">if</span> (engine<span class="operator">.</span>rootObjects()<span class="operator">.</span>isEmpty())
<span class="keyword">return</span> <span class="operator">-</span><span class="number">1</span>;
<span class="keyword">return</span> app<span class="operator">.</span>exec();
}
</pre>
<a name="additional-source-files"></a>
<h2 id="additional-source-files">Additional source files</h2>
<div class="table"><table class="generic">
<thead><tr class="qt-style"><th >Source file</th><th >Purpose</th></tr></thead>
<tr valign="top" class="odd"><td ><code>qtquickcontrols2.conf</code></td><td >Selects the <code>Material</code> style with the <code>Dark</code> theme.</td></tr>
<tr valign="top" class="even"><td ><code>main.qml</code></td><td >The QML code that links AlarmDialog.qml, AlarmModel.qml, AlarmDelegate.qml and TumblerDelegate.qml</td></tr>
<tr valign="top" class="odd"><td ><code>AlarmDialog.qml</code></td><td >Defines the dialog for adding new alarms.</td></tr>
<tr valign="top" class="even"><td ><code>AlarmDelegate.qml</code></td><td >Defines the layout of the main screen of the app.</td></tr>
<tr valign="top" class="odd"><td ><code>AlarmModel.qml</code></td><td >Defines the ListModel used for storing the alarms' data.</td></tr>
<tr valign="top" class="even"><td ><code>TumblerDelegate.qml</code></td><td >Defines the graphical layout of the Tumblers</td></tr>
</table></div>
<a name="qtquickcontrols2-op-op-conf"></a>
<h3 id="qtquickcontrols2-op-op-conf"><code>qtquickcontrols2.conf</code></h3>
<p>The following snippet shows how to set the <code>Dark</code> theme in the <code>Material</code> style:</p>
<pre class="cpp">
[Controls]
Style=Material
[Material]
Theme=Dark
Accent=Red
</pre>
<a name="main-op-op-qml"></a>
<h3 id="main-op-op-qml"><code>main.qml</code></h3>
<p><code>mainWindow</code>, an ApplicationWindow QML type, is the root item in this app.</p>
<pre class="cpp">
ApplicationWindow {
id: window
width: 400
height: 500
visible: true
</pre>
<p>The ListView <code>alarmListView</code> combines the data from <code>alarmModel</code> with the layout defined in <code>alarmDelegate</code>.</p>
<pre class="cpp">
ListView {
id: alarmListView
anchors.fill: parent
model: AlarmModel {}
delegate: AlarmDelegate {}
}
</pre>
<p>New alarms can be added by clicking RoundButton <code>addAlarmButton</code>. Clicking it opens a dialog screen <code>alarmDialog</code>.</p>
<pre class="cpp">
RoundButton {
id: addAlarmButton
text: "+"
anchors.bottom: alarmListView.bottom
anchors.bottomMargin: 8
anchors.horizontalCenter: parent.horizontalCenter
onClicked: alarmDialog.open()
}
AlarmDialog {
id: alarmDialog
x: Math.round((parent.width - width) / 2)
y: Math.round((parent.height - height) / 2)
alarmModel: alarmListView.model
}
</pre>
<a name="alarmdialog-op-op-qml"></a>
<h3 id="alarmdialog-op-op-qml"><code>AlarmDialog.qml</code></h3>
<p>This dialog screen has a RowLayout with a Tumbler each for hours and minutes, and another RowLayout with a Tumbler each for day, month, and year.</p>
<pre class="cpp">
contentItem: RowLayout {
RowLayout {
id: rowTumbler
Tumbler {
id: hoursTumbler
model: 24
delegate: TumblerDelegate {
text: formatNumber(modelData)
}
}
Tumbler {
id: minutesTumbler
model: 60
delegate: TumblerDelegate {
text: formatNumber(modelData)
}
}
}
RowLayout {
id: datePicker
Layout.leftMargin: 20
property alias dayTumbler: dayTumbler
property alias monthTumbler: monthTumbler
property alias yearTumbler: yearTumbler
readonly property var days: [31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
Tumbler {
id: dayTumbler
function updateModel() {
// Populate the model with days of the month. For example: [0, ..., 30]
var previousIndex = dayTumbler.currentIndex
var array = []
var newDays = datePicker.days[monthTumbler.currentIndex]
for (var i = 1; i <= newDays; ++i)
array.push(i)
dayTumbler.model = array
dayTumbler.currentIndex = Math.min(newDays - 1, previousIndex)
}
Component.onCompleted: updateModel()
delegate: TumblerDelegate {
text: formatNumber(modelData)
}
}
Tumbler {
id: monthTumbler
onCurrentIndexChanged: dayTumbler.updateModel()
model: 12
delegate: TumblerDelegate {
text: window.locale.standaloneMonthName(modelData, Locale.ShortFormat)
}
}
Tumbler {
id: yearTumbler
// This array is populated with the next three years. For example: [2018, 2019, 2020]
readonly property var years: (function() {
var currentYear = new Date().getFullYear()
return [0, 1, 2].map(function(value) { return value + currentYear; })
})()
model: years
delegate: TumblerDelegate {
text: formatNumber(modelData)
}
}
}
}
}
</pre>
<p>If you click on <b>OK</b> in the dialog, the entered data will be added to <code>alarmModel</code>:</p>
<pre class="cpp">
onAccepted: {
alarmModel.append({
"hour": hoursTumbler.currentIndex,
"minute": minutesTumbler.currentIndex,
"day": dayTumbler.currentIndex + 1,
"month": monthTumbler.currentIndex + 1,
"year": yearTumbler.years[yearTumbler.currentIndex],
"activated": true,
"label": "",
"repeat": false,
"daysToRepeat": [
{ "dayOfWeek": 0, "repeat": false },
{ "dayOfWeek": 1, "repeat": false },
{ "dayOfWeek": 2, "repeat": false },
{ "dayOfWeek": 3, "repeat": false },
{ "dayOfWeek": 4, "repeat": false },
{ "dayOfWeek": 5, "repeat": false },
{ "dayOfWeek": 6, "repeat": false }
],
})
}
onRejected: alarmDialog.close()
</pre>
<a name="alarmdelegate-op-op-qml"></a>
<h3 id="alarmdelegate-op-op-qml"><code>AlarmDelegate.qml</code></h3>
<p>Each alarm in the main screen is an ItemDelegate. The ItemDelegate <code>root</code> contains all fields on the main screen and the detail screen. The detail screen's fields are only visible after an alarm has been clicked on, i.e. when <code>root.checked</code> is <code>true</code>.</p>
<pre class="cpp">
ItemDelegate {
id: root
width: parent.width
checkable: true
onClicked: ListView.view.currentIndex = index
contentItem: ColumnLayout {
spacing: 0
RowLayout {
ColumnLayout {
id: dateColumn
readonly property date alarmDate: new Date(
model.year, model.month - 1, model.day, model.hour, model.minute)
Label {
id: timeLabel
font.pixelSize: Qt.application.font.pixelSize * 2
text: dateColumn.alarmDate.toLocaleTimeString(window.locale, Locale.ShortFormat)
}
RowLayout {
Label {
id: dateLabel
text: dateColumn.alarmDate.toLocaleDateString(window.locale, Locale.ShortFormat)
}
Label {
id: alarmAbout
text: "βΈ± " + model.label
visible: model.label.length > 0 && !root.checked
}
}
}
Item {
Layout.fillWidth: true
}
Switch {
checked: model.activated
Layout.alignment: Qt.AlignTop
onClicked: model.activated = checked
}
}
CheckBox {
id: alarmRepeat
text: qsTr("Repeat")
checked: model.repeat
visible: root.checked
onToggled: model.repeat = checked
}
Flow {
visible: root.checked && model.repeat
Layout.fillWidth: true
Repeater {
id: dayRepeater
model: daysToRepeat
delegate: RoundButton {
text: Qt.locale().dayName(model.dayOfWeek, Locale.NarrowFormat)
flat: true
checked: model.repeat
checkable: true
Material.background: checked ? Material.accent : "transparent"
onToggled: model.repeat = checked
}
}
}
TextField {
id: alarmDescriptionTextField
placeholderText: qsTr("Enter description here")
cursorVisible: true
visible: root.checked
text: model.label
onTextEdited: model.label = text
}
Button {
id: deleteAlarmButton
text: qsTr("Delete")
width: 40
height: 40
visible: root.checked
onClicked: root.ListView.view.model.remove(root.ListView.view.currentIndex, 1)
}
}
}
</pre>
<a name="alarmmodel-op-op-qml"></a>
<h3 id="alarmmodel-op-op-qml"><code>AlarmModel.qml</code></h3>
<p>This QML file contains the definition of <code>alarmModel</code>, the ListModel that manages the alarm data.</p>
<p>It creates five ListElements with example alarms.</p>
<pre class="cpp">
import QtQuick 2.11
// Populate the model with some sample data.
ListModel {
id: alarmModel
ListElement {
hour: 6
minute: 0
day: 2
month: 8
year: 2018
activated: true
label: "Wake up"
repeat: true
daysToRepeat: [
ListElement { dayOfWeek: 0; repeat: false },
ListElement { dayOfWeek: 1; repeat: false },
ListElement { dayOfWeek: 2; repeat: false },
ListElement { dayOfWeek: 3; repeat: false },
ListElement { dayOfWeek: 4; repeat: false },
ListElement { dayOfWeek: 5; repeat: false },
ListElement { dayOfWeek: 6; repeat: false }
]
}
ListElement {
hour: 6
minute: 0
day: 3
month: 8
year: 2018
activated: true
label: "Wake up"
repeat: true
daysToRepeat: [
ListElement { dayOfWeek: 0; repeat: true },
ListElement { dayOfWeek: 1; repeat: true },
ListElement { dayOfWeek: 2; repeat: true },
ListElement { dayOfWeek: 3; repeat: true },
ListElement { dayOfWeek: 4; repeat: true },
ListElement { dayOfWeek: 5; repeat: false },
ListElement { dayOfWeek: 6; repeat: false }
]
}
ListElement {
hour: 7
minute: 0
day: 3
month: 8
year: 2018
activated: false
label: "Exercise"
repeat: true
daysToRepeat: [
ListElement { dayOfWeek: 0; repeat: true },
ListElement { dayOfWeek: 1; repeat: true },
ListElement { dayOfWeek: 2; repeat: true },
ListElement { dayOfWeek: 3; repeat: true },
ListElement { dayOfWeek: 4; repeat: true },
ListElement { dayOfWeek: 5; repeat: true },
ListElement { dayOfWeek: 6; repeat: true }
]
}
ListElement {
hour: 5
minute: 15
day: 1
month: 9
year: 2018
activated: true
label: ""
repeat: false
daysToRepeat: [
ListElement { dayOfWeek: 0; repeat: false },
ListElement { dayOfWeek: 1; repeat: false },
ListElement { dayOfWeek: 2; repeat: false },
ListElement { dayOfWeek: 3; repeat: false },
ListElement { dayOfWeek: 4; repeat: false },
ListElement { dayOfWeek: 5; repeat: false },
ListElement { dayOfWeek: 6; repeat: false }
]
}
ListElement {
hour: 5
minute: 45
day: 3
month: 9
year: 2018
activated: false
label: ""
repeat: false
daysToRepeat: [
ListElement { dayOfWeek: 0; repeat: false },
ListElement { dayOfWeek: 1; repeat: false },
ListElement { dayOfWeek: 2; repeat: false },
ListElement { dayOfWeek: 3; repeat: false },
ListElement { dayOfWeek: 4; repeat: false },
ListElement { dayOfWeek: 5; repeat: false },
ListElement { dayOfWeek: 6; repeat: false }
]
}
}
</pre>
<a name="tumblerdelegate-qml"></a>
<h3 id="tumblerdelegate-qml">TumblerDelegate.qml</h3>
<p>TumblerDelegate defines the graphical properties of the Tumblers.</p>
<pre class="cpp">
import QtQuick 2.11
import QtQuick.Controls 2.4
import QtQuick.Controls.Material 2.4
Text {
text: modelData
color: Tumbler.tumbler.Material.foreground
font: Tumbler.tumbler.font
opacity: 1.0 - Math.abs(Tumbler.displacement) / (Tumbler.tumbler.visibleItemCount / 2)
horizontalAlignment: Text.AlignHCenter
verticalAlignment: Text.AlignVCenter
}
</pre>
<a name="entering-new-alarms"></a>
<h2 id="entering-new-alarms">Entering new alarms</h2>
<p>At the bottom of the startup screen, you can see a Button for adding alarms. Click it to open the <b>Add new alarm</b> dialog.</p>
<pre class="cpp">
RoundButton {
id: addAlarmButton
text: "+"
anchors.bottom: alarmListView.bottom
anchors.bottomMargin: 8
anchors.horizontalCenter: parent.horizontalCenter
onClicked: alarmDialog.open()
}
</pre>
<p>The dialog for new alarms:</p>
<p class="centerAlign"><img src="images/addalarms.png" alt=""Add alarms"" /></p><p>All fields are entered using Tumbler QML types. If you press <code>OK</code>, the values selected in the Tumblers are written to <code>alarmModel</code>.</p>
<pre class="cpp">
contentItem: RowLayout {
RowLayout {
id: rowTumbler
Tumbler {
id: hoursTumbler
model: 24
delegate: TumblerDelegate {
text: formatNumber(modelData)
}
}
Tumbler {
id: minutesTumbler
model: 60
delegate: TumblerDelegate {
text: formatNumber(modelData)
}
}
}
RowLayout {
id: datePicker
Layout.leftMargin: 20
property alias dayTumbler: dayTumbler
property alias monthTumbler: monthTumbler
property alias yearTumbler: yearTumbler
readonly property var days: [31, 29, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31]
Tumbler {
id: dayTumbler
function updateModel() {
// Populate the model with days of the month. For example: [0, ..., 30]
var previousIndex = dayTumbler.currentIndex
var array = []
var newDays = datePicker.days[monthTumbler.currentIndex]
for (var i = 1; i <= newDays; ++i)
array.push(i)
dayTumbler.model = array
dayTumbler.currentIndex = Math.min(newDays - 1, previousIndex)
}
Component.onCompleted: updateModel()
delegate: TumblerDelegate {
text: formatNumber(modelData)
}
}
Tumbler {
id: monthTumbler
onCurrentIndexChanged: dayTumbler.updateModel()
model: 12
delegate: TumblerDelegate {
text: window.locale.standaloneMonthName(modelData, Locale.ShortFormat)
}
}
Tumbler {
id: yearTumbler
// This array is populated with the next three years. For example: [2018, 2019, 2020]
readonly property var years: (function() {
var currentYear = new Date().getFullYear()
return [0, 1, 2].map(function(value) { return value + currentYear; })
})()
model: years
delegate: TumblerDelegate {
text: formatNumber(modelData)
}
}
}
}
}
</pre>
<a name="editing-alarms"></a>
<h2 id="editing-alarms">Editing alarms</h2>
<p>If you click on a particular alarm, you can edit it in the detail screen.</p>
<p class="centerAlign"><img src="images/detailscreen.png" alt="" /></p><p>Clicking on an alarm sets <code>root.checked</code> to <code>true</code>, which makes visible the fields of the detail screen.</p>
<pre class="cpp">
visible: root<span class="operator">.</span>checked
</pre>
<p>If you want the alarm to trigger also on other days, check <code>alarmRepeat</code>. The Repeater will display a checkable RoundButton for each day of the week.</p>
<pre class="cpp">
Flow {
visible: root.checked && model.repeat
Layout.fillWidth: true
Repeater {
id: dayRepeater
model: daysToRepeat
delegate: RoundButton {
text: Qt.locale().dayName(model.dayOfWeek, Locale.NarrowFormat)
flat: true
checked: model.repeat
checkable: true
Material.background: checked ? Material.accent : "transparent"
onToggled: model.repeat = checked
}
}
}
</pre>
<p>If you modify the description of the alarm, it will be reflected in the main screen afterwards.</p>
<pre class="cpp">
TextField {
id: alarmDescriptionTextField
placeholderText: qsTr("Enter description here")
cursorVisible: true
visible: root.checked
text: model.label
onTextEdited: model.label = text
}
</pre>
<a name="deleting-alarms"></a>
<h2 id="deleting-alarms">Deleting alarms</h2>
<p>The detail screen (see above) has a Button for deleting alarms. When <code>onClicked</code> is emitted, the current ListElement is deleted from <code>alarmModel</code>.</p>
<pre class="cpp">
Button {
id: deleteAlarmButton
text: qsTr("Delete")
width: 40
height: 40
visible: root.checked
onClicked: root.ListView.view.model.remove(root.ListView.view.currentIndex, 1)
}
}
}
</pre>
<a name="summary"></a>
<h3 id="summary">Summary</h3>
<p>The app has no code for adding sound or vibration to the alarm, nor does it store the alarms in any format or database. Maybe it could be an interesting coding project to add those features. Adding sound to this program can be realized with Qt Multimedia QML Types. Storing the data could be done quickly and easily in JSON format.</p>
<p>Files:</p>
<ul>
<li><a href="qtdoc-tutorials-alarms-alarmdelegate-qml.html">tutorials/alarms/AlarmDelegate.qml</a></li>
<li><a href="qtdoc-tutorials-alarms-alarmdialog-qml.html">tutorials/alarms/AlarmDialog.qml</a></li>
<li><a href="qtdoc-tutorials-alarms-alarmmodel-qml.html">tutorials/alarms/AlarmModel.qml</a></li>
<li><a href="qtdoc-tutorials-alarms-tumblerdelegate-qml.html">tutorials/alarms/TumblerDelegate.qml</a></li>
<li><a href="qtdoc-tutorials-alarms-alarms-pro.html">tutorials/alarms/alarms.pro</a></li>
<li><a href="qtdoc-tutorials-alarms-main-cpp.html">tutorials/alarms/main.cpp</a></li>
<li><a href="qtdoc-tutorials-alarms-main-qml.html">tutorials/alarms/main.qml</a></li>
<li><a href="qtdoc-tutorials-alarms-qml-qrc.html">tutorials/alarms/qml.qrc</a></li>
</ul>
</div>
<p><b>See also </b>Qt Multimedia QML Types and JSON Support in Qt.</p>
<!-- @@@tutorials/alarms -->
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7
>
armv7hl
>
media
>
core-updates
>
by-pkgid
>
bdbbdfc3f538bf93bb0eb988a7a43005
>
files
>
580
