Qt Reference Documentation

# expandingdelegates.qml Example File

declarative/modelviews/listview/highlight/qml/highlight/expandingdelegates.qml

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     import QtQuick 1.0
     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
                         }

                         Text {
                             text: "Ingredients"
                             font.pointSize: 12; font.bold: true
                             opacity: recipe.detailsOpacity
                         }

                         Text {
                             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

                     Text {
                         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
         }
     }