Qt 5.7 | Qt Quick | Qt Quick Examples - Views

Qt 5.7.1 Reference Documentation

# Qt Quick Examples - Views

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