Qt 5.8 | Qt Quick | Qt Quick Examples - Views | expandingdelegates.qml Example File

Qt 5.8.0 Reference Documentation

# expandingdelegates.qml Example File

views/listview/expandingdelegates.qml

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      import QtQuick 2.0
      import "content"

      // This example illustrates expanding a list item to show a more detailed view.

      Rectangle {
          id: page
          width: 400; height: 240
          color: "black"

          // Delegate for the recipes.  This delegate has two modes:
          // 1. List mode (default), which just shows the picture and title of the recipe.
          // 2. Details mode, which also shows the ingredients and method.
          Component {
              id: recipeDelegate
              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
                  width: listView.width
                  height: 70

                  // A simple rounded rectangle for the background
                  Rectangle {
                      id: background
                      x: 2; y: 2; width: parent.width - x*2; height: parent.height - y*2
                      color: "ivory"
                      border.color: "orange"
                      radius: 5
                  }

                  // This mouse region covers the entire delegate.
                  // When clicked it changes mode to 'Details'.  If we are already
                  // in Details mode, then no change will happen.
                  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
                      }
                      Column {
                          width: background.width - recipeImage.width - 20; height: recipeImage.height
                          spacing: 5

                          Text {
                              text: title
                              font.bold: true; font.pointSize: 16
                          }

                          SmallText {
                              text: "Ingredients"
                              font.bold: true
                              opacity: recipe.detailsOpacity
                          }

                          SmallText {
                              text: ingredients
                              wrapMode: Text.WordWrap
                              width: parent.width
                              opacity: recipe.detailsOpacity
                          }
                      }
                  }

                  Item {
                      id: details
                      x: 10; width: parent.width - 20

                      anchors { top: topLayout.bottom; topMargin: 10; bottom: parent.bottom; bottomMargin: 10 }
                      opacity: recipe.detailsOpacity
                      SmallText {
                          id: methodTitle
                          anchors.top: parent.top
                          text: "Method"
                          font.pointSize: 12; font.bold: true
                      }

                      Flickable {
                          id: flick
                          width: parent.width
                          anchors { top: methodTitle.bottom; bottom: parent.bottom }
                          contentHeight: methodText.height
                          clip: true

                          Text { id: methodText; text: method; wrapMode: Text.WordWrap; width: details.width }
                      }

                      Image {
                          anchors { right: flick.right; top: flick.top }
                          source: "content/pics/moreUp.png"
                          opacity: flick.atYBeginning ? 0 : 1
                      }

                      Image {
                          anchors { right: flick.right; bottom: flick.bottom }
                          source: "content/pics/moreDown.png"
                          opacity: flick.atYEnd ? 0 : 1
                      }
                  }

                  // 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" }
                      }
                  }
              }
          }

          // The actual list
          ListView {
              id: listView
              anchors.fill: parent
              model: RecipesModel {}
              delegate: recipeDelegate
          }
      }