QtQuick.qtquick-views-example

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Views is a collection of small QML examples relating to model and view functionality. They demonstrate how to show data from a model using the Qt Quick view types. For more information, visit the Models and Views in Qt Quick page.

Running the Example

To run the example from Qt Creator, open the Welcome mode and select the example from Examples. For more information, visit Building and Running an Example.

GridView and PathView

GridView and PathView demonstrate usage of these types to display views.

    GridView {
anchors.fill: parent
cellWidth: 100; cellHeight: 100
focus: true
model: appModel
highlight: Rectangle { width: 80; height: 80; color: "lightsteelblue" }
delegate: Item {
width: 100; height: 100
Image {
id: myIcon
y: 20; anchors.horizontalCenter: parent.horizontalCenter
source: icon
}
Text {
anchors { top: myIcon.bottom; horizontalCenter: parent.horizontalCenter }
text: name
}
MouseArea {
anchors.fill: parent
onClicked: parent.GridView.view.currentIndex = index
}
}
}

Dynamic List

Dynamic List demonstrates animation of runtime additions and removals to a ListView.

The ListView.onAdd signal handler runs an animation when new items are added to the view, and the ListView.onRemove another when they are removed.

        Item {
ListView.onAdd: SequentialAnimation {
PropertyAction { target: delegateItem; property: "height"; value: 0 }
NumberAnimation { target: delegateItem; property: "height"; to: 80; duration: 250; easing.type: Easing.InOutQuad }
}
ListView.onRemove: SequentialAnimation {
PropertyAction { target: delegateItem; property: "ListView.delayRemove"; value: true }
NumberAnimation { target: delegateItem; property: "height"; to: 0; duration: 250; easing.type: Easing.InOutQuad }
// Make sure delayRemove is set back to false so that the item can be destroyed
PropertyAction { target: delegateItem; property: "ListView.delayRemove"; value: false }
}
}

Expanding Delegates

Expanding Delegates demonstrates delegates that expand when activated.

It has a complex delegate the size and appearance of which can change, displacing other items in the view.

        Item {
id: recipe
// Create a property to contain the visibility of the details.
// We can bind multiple element's opacity to this one property,
// rather than having a "PropertyChanges" line for each element we
// want to fade.
property real detailsOpacity : 0
MouseArea {
anchors.fill: parent
onClicked: recipe.state = 'Details';
}
// Lay out the page: picture, title and ingredients at the top, and method at the
// bottom.  Note that elements that should not be visible in the list
// mode have their opacity set to recipe.detailsOpacity.
Row {
id: topLayout
x: 10; y: 10; height: recipeImage.height; width: parent.width
spacing: 10
Image {
id: recipeImage
width: 50; height: 50
source: picture
}
Item {
id: details
x: 10; width: parent.width - 20
anchors { top: topLayout.bottom; topMargin: 10; bottom: parent.bottom; bottomMargin: 10 }
opacity: recipe.detailsOpacity
}
// A button to close the detailed view, i.e. set the state back to default ('').
TextButton {
y: 10
anchors { right: background.right; rightMargin: 10 }
opacity: recipe.detailsOpacity
text: "Close"
onClicked: recipe.state = '';
}
states: State {
name: "Details"
PropertyChanges { target: background; color: "white" }
PropertyChanges { target: recipeImage; width: 130; height: 130 } // Make picture bigger
PropertyChanges { target: recipe; detailsOpacity: 1; x: 0 } // Make details visible
PropertyChanges { target: recipe; height: listView.height } // Fill the entire list area with the detailed view
// Move the list so that this item is at the top.
PropertyChanges { target: recipe.ListView.view; explicit: true; contentY: recipe.y }
// Disallow flicking while we're in detailed view
PropertyChanges { target: recipe.ListView.view; interactive: false }
}
transitions: Transition {
// Make the state changes smooth
ParallelAnimation {
ColorAnimation { property: "color"; duration: 500 }
NumberAnimation { duration: 300; properties: "detailsOpacity,x,contentY,height,width" }
}
}
}

Highlight

Highlight demonstrates adding a custom highlight to a ListView.

    // Define a highlight with customized movement between items.
Component {
id: highlightBar
Rectangle {
width: 200; height: 50
color: "#FFFF88"
y: listView.currentItem.y;
Behavior on y { SpringAnimation { spring: 2; damping: 0.1 } }
}
}
ListView {
id: listView
width: 200; height: parent.height
x: 30
model: PetsModel {}
delegate: petDelegate
focus: true
// Set the highlight delegate. Note we must also set highlightFollowsCurrentItem
// to false so the highlight delegate can control how the highlight is moved.
highlight: highlightBar
highlightFollowsCurrentItem: false
}

Highlight Ranges

Highlight Ranges shows the three different highlight range modes of ListView.

Rectangle {
id: root
property int current: 0
property bool increasing: true
// Example index automation for convenience, disabled on click or tap
SequentialAnimation {
id: anim
loops: -1
running: true
ScriptAction {
script: if (increasing) {
current++;
if (current >= aModel.count -1) {
current = aModel.count - 1;
increasing = !increasing;
}
} else {
current--;
if (current <= 0) {
current = 0;
increasing = !increasing;
}
}
}
PauseAnimation { duration: 500 }
}
ListView {
id: list1
height: 50; width: parent.width
model: PetsModel {id: aModel}
delegate: petDelegate
orientation: ListView.Horizontal
highlight: Rectangle { color: "lightsteelblue" }
currentIndex: root.current
onCurrentIndexChanged: root.current = currentIndex
focus: true
}
ListView {
id: list2
y: 160
height: 50; width: parent.width
model: PetsModel {}
delegate: petDelegate
orientation: ListView.Horizontal
highlight: Rectangle { color: "yellow" }
currentIndex: root.current
preferredHighlightBegin: 80; preferredHighlightEnd: 220
highlightRangeMode: ListView.ApplyRange
}
ListView {
id: list3
y: 320
height: 50; width: parent.width
model: PetsModel {}
delegate: petDelegate
orientation: ListView.Horizontal
highlight: Rectangle { color: "yellow" }
currentIndex: root.current
onCurrentIndexChanged: root.current = currentIndex
preferredHighlightBegin: 125; preferredHighlightEnd: 125
highlightRangeMode: ListView.StrictlyEnforceRange
}
}

Sections

Sections demonstrates the various section headers and footers available to ListView.

    // The delegate for each section header
Component {
id: sectionHeading
Rectangle {
width: container.width
height: childrenRect.height
color: "lightsteelblue"
Text {
text: section
font.bold: true
font.pixelSize: 20
}
}
}
ListView {
id: view
anchors.top: parent.top
anchors.bottom: buttonBar.top
width: parent.width
model: animalsModel
delegate: Text { text: name; font.pixelSize: 18 }
section.property: "size"
section.criteria: ViewSection.FullString
section.delegate: sectionHeading
}

Packages

Packages uses the Package type to transition delegates between two views.

It has a Package object which defines delegate items for each view and an item that can be transferred between delegates.

Package {
Text { id: listDelegate; width: parent.width; height: 25; text: 'Empty'; Package.name: 'list' }
Text { id: gridDelegate; width: parent.width / 2; height: 50; text: 'Empty'; Package.name: 'grid' }
Rectangle {
id: wrapper
width: parent.width; height: 25
color: 'lightsteelblue'
Text { text: display; anchors.centerIn: parent }
state: root.upTo > index ? 'inGrid' : 'inList'
states: [
State {
name: 'inList'
ParentChange { target: wrapper; parent: listDelegate }
},
State {
name: 'inGrid'
ParentChange {
target: wrapper; parent: gridDelegate
x: 0; y: 0; width: gridDelegate.width; height: gridDelegate.height
}
}
]
transitions: [
Transition {
ParentAnimation {
NumberAnimation { properties: 'x,y,width,height'; duration: 300 }
}
}
]
}
}

A DelegateModel allows the individual views to access their specific items from the shared package delegate.

DelegateModel {
id: visualModel
delegate: Delegate {}
model: myModel
}
ListView {
id: lv
height: parent.height/2
width: parent.width
model: visualModel.parts.list
}
GridView {
y: parent.height/2
height: parent.height/2
width: parent.width
cellWidth: width / 2
cellHeight: 50
model: visualModel.parts.grid
}

ObjectModel

ObjectModel uses an ObjectModel for the model instead of a ListModel.

    ObjectModel {
id: itemModel
Rectangle {
width: view.width; height: view.height
color: "#FFFEF0"
Text { text: "Page 1"; font.bold: true; anchors.centerIn: parent }
Component.onDestruction: if (printDestruction) print("destroyed 1")
}
Rectangle {
width: view.width; height: view.height
color: "#F0FFF7"
Text { text: "Page 2"; font.bold: true; anchors.centerIn: parent }
Component.onDestruction: if (printDestruction) print("destroyed 2")
}
Rectangle {
width: view.width; height: view.height
color: "#F4F0FF"
Text { text: "Page 3"; font.bold: true; anchors.centerIn: parent }
Component.onDestruction: if (printDestruction) print("destroyed 3")
}
}
ListView {
id: view
anchors { fill: parent; bottomMargin: 30 }
model: itemModel
preferredHighlightBegin: 0; preferredHighlightEnd: 0
highlightRangeMode: ListView.StrictlyEnforceRange
orientation: ListView.Horizontal
snapMode: ListView.SnapOneItem; flickDeceleration: 2000
cacheBuffer: 200
}

Display Margins

Display Margins uses delegates to display items and implements a simple header and footer components.

Files:

• views/views.qml
• views/gridview/gridview-example.qml
• views/listview/displaymargin.qml
• views/listview/dynamiclist.qml
• views/listview/expandingdelegates.qml
• views/listview/highlight.qml
• views/listview/highlightranges.qml
• views/listview/sections.qml
• views/listview/content/PetsModel.qml
• views/listview/content/PressAndHoldButton.qml
• views/listview/content/RecipesModel.qml
• views/listview/content/SmallText.qml
• views/listview/content/TextButton.qml
• views/listview/content/ToggleButton.qml
• views/objectmodel/objectmodel.qml
• views/package/Delegate.qml
• views/package/view.qml
• views/parallax/parallax.qml
• views/parallax/content/Clock.qml
• views/parallax/content/ParallaxView.qml
• views/parallax/content/QuitButton.qml
• views/parallax/content/Smiley.qml
• views/parallax/content/pics/home-page.svg
• views/pathview/pathview-example.qml
• views/visualdatamodel/dragselection.qml
• views/visualdatamodel/slideshow.qml
• views/main.cpp
• views/views.pro
• views/views.qmlproject
• views/views.qrc
• views/visualdatamodel/visualdatamodel.qmlproject