- Qt 5.15
- Qt Quick
- Qt Quick Examples - Views
- Qt 5.15.18 Reference Documentation

# Qt Quick Examples - Views

This is a collection of QML model-view examples.

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.

#### Using 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 {
                 required property string icon
                 required property string name
                 required property int index

                 width: 100; height: 100

                 Image {
                     id: myIcon
                     y: 20; anchors.horizontalCenter: parent.horizontalCenter
                     source: parent.icon
                 }
                 Text {
                     anchors { top: myIcon.bottom; horizontalCenter: parent.horizontalCenter }
                     text: parent.name
                 }
                 MouseArea {
                     anchors.fill: parent
                     onClicked: parent.GridView.view.currentIndex = parent.index
                 }
             }
         }

#### Using 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

                 required property string title
                 required property string picture
                 required property string ingredients
                 required property string method

                 // 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: recipe.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" }
                     }
                 }
             }

#### Using Highlight

Highlight demonstrates adding a custom highlight to a ListView.

         // Define a highlight with customized movement between items.
         component 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
         }

#### Using 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 (root.increasing) {
                             root.current++;
                             if (root.current >= aModel.count -1) {
                                 root.current = aModel.count - 1;
                                 root.increasing = !root.increasing;
                             }
                         } else {
                             root.current--;
                             if (root.current <= 0) {
                                 root.current = 0;
                                 root.increasing = !root.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
         }
     }

#### Using 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"

                 required property string section

                 Text {
                     text: parent.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 {
                 required property string name
                 text: name
                 font.pixelSize: 18
             }

             section.property: "size"
             section.criteria: ViewSection.FullString
             section.delegate: sectionHeading
         }

#### Using Packages

Packages use 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 {
         id: delegate

         required property int upTo
         required property int index
         required property string display

         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: delegate.display; anchors.centerIn: parent }
             state: delegate.upTo > delegate.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 {
             upTo: root.upTo
         }
         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
     }

#### Using 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 (root.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 (root.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 (root.activeFocusprintDestruction) 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
         }

#### Using Display Margins

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

Example project @ code.qt.io