- Qt 5.3
- Qt Quick
- Qt Quick Examples - Views
- expandingdelegates.qml Example File
- Qt 5.3.2 Reference Documentation

# expandingdelegates.qml Example File

views/listview/expandingdelegates.qml

    /****************************************************************************
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    ** This file is part of the examples of the Qt Toolkit.
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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
        }
    }