Qt Reference Documentation

expandingdelegates.qml Example File

declarative/modelviews/listview/expandingdelegates.qml
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 import Qt 4.7
 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
     }
 }
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