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<td ><a href="index.html">Qt 5.12</a></td><td >Coffee Machine Example</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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<h1 class="title">Coffee Machine Example</h1>
<span class="subtitle"></span>
<!-- $$$demos/coffee-description -->
<div class="descr"> <a name="details"></a>
<div class="border"><p class="centerAlign"><img src="images/coffee_machine_overview.png" alt="" /></p></div><p>The coffee machine application lets you choose a type of coffee on the left side of the main screen. After selection, the app displays what the coffee blend will contain (ratio coffee/hot milk/milk foam). This can be modified with two sliders. When the brew has been started, the app shows an animated display of the brewing process, then returns to the start screen.</p>
<p>First the start screen <code>Animationflowform</code> is displayed, showing a sidebar with several types of coffee, and an empty cup on the right screen.</p>
<p>Selecting a coffee type - for example, cappuccino - triggers <code>animation1</code> and <code>animation2</code> in CoffeeButton.qml. On the right side, you will see the coffee blend you selected.</p>
<pre class="qml">
MouseArea {
anchors.fill: parent
onClicked: root.clicked()
onPressed: {
glow.visible = true
animation1.start()
animation2.start()
}
}
</pre>
<p>It also triggers cappuccinoButton.onClicked(), which sets the default mix for the coffee type selected:</p>
<pre class="qml">
cappuccinoButton.onClicked: {
sideBar.currentCoffee = qsTr("Cappucino")
sideBar.currentMilk = 7
sideBar.currentCoffeeAmount = 3.5
sideBar.coffeeSelected()
}
</pre>
<div class="border"><p class="centerAlign"><img src="images/coffee_machine_selection.png" alt="" /></p></div><p class="figCaption">Coffee blend cappuccino</p>
<p><code>sideBar.coffeeSelected()</code> <code>sets</code> applicationFlow.state to "selection"</p>
<p>If you click "Brew me a cup", choosingCoffee.brewButtonSelection.onClicked is triggered:</p>
<pre class="qml">
choosingCoffee.brewButtonSelection.onClicked: {
applicationFlow.state = "settings"
applicationFlow.choosingCoffee.milkSlider.value = applicationFlow.choosingCoffee.sideBar.currentMilk
applicationFlow.choosingCoffee.sugarSlider.value = 2
}
</pre>
<p>On the right side of the screen, you will see two sliders, one for the amount of milk, and one for sugar. They will have default values, but can be modified by the user.</p>
<div class="border"><p class="centerAlign"><img src="images/coffee_machine_modify.png" alt="" /></p></div><p>If you click on <code>Brew</code>, <code>choosingCoffee.brewButton.onClicked()</code> is triggered, which displays a screen with the message "Please insert cup into tray".</p>
<pre class="qml">
choosingCoffee.brewButton.onClicked: {
applicationFlow.state = "empty cup"
}
</pre>
<div class="border"><p class="centerAlign"><img src="images/coffee_machine_emptycup.png" alt="" /></p></div><p>Clicking on <code>Continue</code> starts the brewing of the coffee type you selected.</p>
<pre class="qml">
emptyCup.continueButton.onClicked: {
applicationFlow.state = "brewing"
brewing.coffeeName = choosingCoffee.sideBar.currentCoffee
brewing.start()
}
</pre>
<p>The brewing process is defined as follows in <code>Brewing.qml</code>:</p>
<pre class="qml">
BrewingForm {
id: root
function start() {
animation.start()
}
signal finished()
SequentialAnimation {
id: animation
PauseAnimation {
duration: 1500
}
PropertyAction {
target: root
property: "state"
value: "coffee"
}
PauseAnimation {
duration: 1500
}
PropertyAction {
target: root
property: "state"
value: "milk"
}
PauseAnimation {
duration: 1500
}
ScriptAction {
script: root.finished()
}
}
Behavior on cup.coffeeAmount {
PropertyAnimation {
}
}
Behavior on cup.milkAmount {
PropertyAnimation {
}
}
}
</pre>
<p>After completion, the application returns to the start screen.</p>
<p>Files:</p>
<ul>
<li><a href="qtdoc-demos-coffee-applicationflow-qml.html">demos/coffee/ApplicationFlow.qml</a></li>
<li><a href="qtdoc-demos-coffee-applicationflowform-ui-qml.html">demos/coffee/ApplicationFlowForm.ui.qml</a></li>
<li><a href="qtdoc-demos-coffee-brewing-qml.html">demos/coffee/Brewing.qml</a></li>
<li><a href="qtdoc-demos-coffee-brewingform-ui-qml.html">demos/coffee/BrewingForm.ui.qml</a></li>
<li><a href="qtdoc-demos-coffee-choosingcoffee-ui-qml.html">demos/coffee/ChoosingCoffee.ui.qml</a></li>
<li><a href="qtdoc-demos-coffee-coffeebutton-qml.html">demos/coffee/CoffeeButton.qml</a></li>
<li><a href="qtdoc-demos-coffee-cup-qml.html">demos/coffee/Cup.qml</a></li>
<li><a href="qtdoc-demos-coffee-cupform-ui-qml.html">demos/coffee/CupForm.ui.qml</a></li>
<li><a href="qtdoc-demos-coffee-emptycup-qml.html">demos/coffee/EmptyCup.qml</a></li>
<li><a href="qtdoc-demos-coffee-emptycupform-ui-qml.html">demos/coffee/EmptyCupForm.ui.qml</a></li>
<li><a href="qtdoc-demos-coffee-navigationbutton-ui-qml.html">demos/coffee/NavigationButton.ui.qml</a></li>
<li><a href="qtdoc-demos-coffee-sidebar-qml.html">demos/coffee/SideBar.qml</a></li>
<li><a href="qtdoc-demos-coffee-sidebarform-ui-qml.html">demos/coffee/SideBarForm.ui.qml</a></li>
<li><a href="qtdoc-demos-coffee-coffee-pro.html">demos/coffee/coffee.pro</a></li>
<li><a href="qtdoc-demos-coffee-imports-coffee-constants-qml.html">demos/coffee/imports/Coffee/Constants.qml</a></li>
<li><a href="qtdoc-demos-coffee-imports-coffee-qmldir.html">demos/coffee/imports/Coffee/qmldir</a></li>
<li><a href="qtdoc-demos-coffee-main-cpp.html">demos/coffee/main.cpp</a></li>
<li><a href="qtdoc-demos-coffee-main-qml.html">demos/coffee/main.qml</a></li>
<li><a href="qtdoc-demos-coffee-qml-qrc.html">demos/coffee/qml.qrc</a></li>
</ul>
<p>Images:</p>
<ul>
<li><a href="images/used-in-examples/demos/coffee/images/cup structure/coffee_cup_large.png">demos/coffee/images/cup structure/coffee_cup_large.png</a></li>
<li><a href="images/used-in-examples/demos/coffee/images/cup structure/coffee_cup_outline.png">demos/coffee/images/cup structure/coffee_cup_outline.png</a></li>
<li><a href="images/used-in-examples/demos/coffee/images/cup structure/cup elements/coffee_cup_back.png">demos/coffee/images/cup structure/cup elements/coffee_cup_back.png</a></li>
<li><a href="images/used-in-examples/demos/coffee/images/cup structure/cup elements/coffee_cup_coverplate.png">demos/coffee/images/cup structure/cup elements/coffee_cup_coverplate.png</a></li>
<li><a href="images/used-in-examples/demos/coffee/images/cup structure/cup elements/coffee_cup_front.png">demos/coffee/images/cup structure/cup elements/coffee_cup_front.png</a></li>
<li><a href="images/used-in-examples/demos/coffee/images/cup structure/liquids/liquid_coffee.png">demos/coffee/images/cup structure/liquids/liquid_coffee.png</a></li>
<li><a href="images/used-in-examples/demos/coffee/images/cup structure/liquids/liquid_foam.png">demos/coffee/images/cup structure/liquids/liquid_foam.png</a></li>
<li><a href="images/used-in-examples/demos/coffee/images/cup structure/liquids/liquid_milk.png">demos/coffee/images/cup structure/liquids/liquid_milk.png</a></li>
<li><a href="images/used-in-examples/demos/coffee/images/icons/coffees/Americano.png">demos/coffee/images/icons/coffees/Americano.png</a></li>
<li><a href="images/used-in-examples/demos/coffee/images/icons/coffees/Espresso.png">demos/coffee/images/icons/coffees/Espresso.png</a></li>
<li><a href="images/used-in-examples/demos/coffee/images/icons/coffees/Latte.png">demos/coffee/images/icons/coffees/Latte.png</a></li>
<li><a href="images/used-in-examples/demos/coffee/images/icons/coffees/Macchiato.png">demos/coffee/images/icons/coffees/Macchiato.png</a></li>
<li><a href="images/used-in-examples/demos/coffee/images/icons/coffees/cappucino.png">demos/coffee/images/icons/coffees/cappucino.png</a></li>
<li><a href="images/used-in-examples/demos/coffee/images/icons/contents/coffee.png">demos/coffee/images/icons/contents/coffee.png</a></li>
<li><a href="images/used-in-examples/demos/coffee/images/icons/contents/milk.png">demos/coffee/images/icons/contents/milk.png</a></li>
<li><a href="images/used-in-examples/demos/coffee/images/icons/contents/sugar.png">demos/coffee/images/icons/contents/sugar.png</a></li>
<li><a href="images/used-in-examples/demos/coffee/images/ui controls/buttons/back/white.png">demos/coffee/images/ui controls/buttons/back/white.png</a></li>
<li><a href="images/used-in-examples/demos/coffee/images/ui controls/buttons/go/white.png">demos/coffee/images/ui controls/buttons/go/white.png</a></li>
<li><a href="images/used-in-examples/demos/coffee/images/ui controls/line.png">demos/coffee/images/ui controls/line.png</a></li>
</ul>
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<!-- @@@demos/coffee -->
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