Listview drawing all delegates on hide

Hi all,
I have a listview with a lot of items. Everything works fine as long as I don't click on the delegate to show me the details of the item
in a different view on my stackview. Hidding the view with the listview in it triggers a full drawing of all delegates in the list even those
which not have been displayed so far which makes my app hung up for more than 2 secs. Has anyone an idea what causes the redrawing?
Happens on Android and iOS. On Android I'm using Qt5.2 on iOS 5.3
My Listview with its delegate:

Code:

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ListView {
        id: listViewGrowers
        property int sortedCol: Constants.LIST_SORT_NAME_UP
        //delegate for tablets
        Component {
            id: growerDelegateTablet
            Rectangle {
                id:delegateContent
 
                width: listViewGrowers.width
                height: visible?DisplayInfo.lineheight * 3:0
                color: "transparent"
                NavLine {
                    id: line
                    width: parent.width
                    anchors.top: parent.top
                    anchors.leftMargin: 0
                }
                MouseArea {
                    anchors.fill: parent
                    onClicked: {
                        Qt.inputMethod.hide()
                        growerListContent.visible = false
                        growerItemSelected(model.modelData)
                    }
                }
 
                Rectangle {
                    id: imageStars
                    anchors.left: parent.left
                    anchors.top: line.bottom
                    width: parent.width * 0.2
                    height: parent.height
                    color: (listViewGrowers.sortedCol == Constants.LIST_SORT_STARS_UP || listViewGrowers.sortedCol == Constants.LIST_SORT_STARS_DOWN)?Theme.selected_col:"transparent"
                    Image {
                        asynchronous: true
                        anchors.top: parent.top
                        anchors.topMargin: DisplayInfo.lineheight * 0.5
                        anchors.left: parent.left
                        anchors.leftMargin: DisplayInfo.marginunit * 5
                        fillMode: Image.PreserveAspectFit
                        source: ("qrc:///icons/star_" + model.stars)
                        height: DisplayInfo.lineheight * 0.8
                    }
                }
                Rectangle {
                    id: textGrower
                    anchors.left: imageStars.right
                    anchors.top: line.bottom
                    width: parent.width * 0.4
                    height: parent.height
                    color: (listViewGrowers.sortedCol == Constants.LIST_SORT_NAME_UP || listViewGrowers.sortedCol == Constants.LIST_SORT_NAME_DOWN)?Theme.selected_col:"transparent"
                    StyledText {
                        text: model.name
                        anchors.left: parent.left
                        anchors.leftMargin: DisplayInfo.marginunit * 2
                        anchors.top: parent.top
                        anchors.topMargin: DisplayInfo.lineheight * 0.5
                    }
                    Component.onCompleted: {console.log("drawed: " + model.name)}
 
                }
                Rectangle {
                    id: imageGrowerLogo
                    width: DisplayInfo.lineheight * 3.0
                    height: parent.height
                    anchors.left: textGrower.right
                    anchors.top: line.bottom
                    color: (listViewGrowers.sortedCol == Constants.LIST_SORT_NAME_UP || listViewGrowers.sortedCol == Constants.LIST_SORT_NAME_DOWN)?Theme.selected_col:"transparent"
                    Image {
                        asynchronous: true
                        source: "qrc:///icons/logo_dummy"
                        anchors.centerIn: parent
                        sourceSize.height: DisplayInfo.lineheight * 2.8
                        sourceSize.width: DisplayInfo.lineheight * 2.8
                    }
                }
                Rectangle {
                    id: region
                    anchors.left: imageGrowerLogo.right
                    anchors.top: line.bottom
                    width: parent.width * 0.2
                    height: parent.height
                    color: (listViewGrowers.sortedCol == Constants.LIST_SORT_REGION_UP  || listViewGrowers.sortedCol == Constants.LIST_SORT_REGION_DOWN)?Theme.selected_col:"transparent"
                    StyledText {
                        anchors.top: parent.top
                        anchors.topMargin: DisplayInfo.lineheight * 0.5
                        anchors.left: parent.left
                        anchors.leftMargin: DisplayInfo.marginunit * 2
                        text: model.region
                    }
                    MouseArea {
                        anchors.fill: parent
                        onClicked: {
                            Qt.inputMethod.hide()
                            console.log('region selected: ' + model.region)
                        }
                    }
                }
                Rectangle {
                    id: addtionalnfo
                    anchors.left: region.right
                    anchors.top: line.bottom
                    //width is listview filling
                    width: parent.width - (imageStars.width + textGrower.width + imageGrowerLogo + region)
                    height: parent.height
                    color: "transparent"
                    Image {
                        id: bioFlag
                        asynchronous: true
                        source: "qrc:///icons/bio"
                        anchors.top: parent.top
                        anchors.topMargin: DisplayInfo.lineheight * 0.5
                        anchors.left: parent.left
                        anchors.leftMargin: DisplayInfo.marginunit * 2
                        sourceSize.height: DisplayInfo.lineheight
                        sourceSize.width: DisplayInfo.lineheight
                        visible: model.bio
                    }
                    Image {
                        id: newFlag
                        source: "qrc:///icons/new"
                        asynchronous: true
                        anchors.top: parent.top
                        anchors.topMargin: DisplayInfo.lineheight * 0.5
                        anchors.left: bioFlag.right
                        anchors.leftMargin: DisplayInfo.marginunit * 2
                        sourceSize.height: DisplayInfo.lineheight
                        sourceSize.width: DisplayInfo.lineheight
                        visible: model.isNew
                    }
                }
            }
        }
 
        //delegate for phones
        Component {
            id: growerDelegatePhone
            Rectangle {
                width: ListView.width
                height: DisplayInfo.lineheight * 3
            }
        }
 
        Connections {
            target: filterDialog;
            onApplied: {
 
                filterItem.stars = filterDialog.selStars
                filterItem.onlyBio = filterDialog.selBio
                filterItem.onlyNew = filterDialog.selNew
                filterItem.regions = filterDialog.propregions
                growers.filterSettings(filterItem, textFilter.text)
            }
        }
        Connections {
            target: filterDialog;
            onCanceledFilter: {
                filterItem.stars = filterDialog.selStars
                filterItem.onlyBio = filterDialog.selBio
                filterItem.onlyNew = filterDialog.selNew
                filterItem.regions = filterDialog.propregions
                growers.filterSettings(filterItem, textFilter.text)
            }
        }
 
        FilterGrower{
            id: filterItem
        }
 
        width: DisplayInfo.isLowRes?parent.width:parent.width * 0.9
        anchors.top: header.bottom
        anchors.topMargin: DisplayInfo.lineheight
        anchors.bottom: growerListContent.bottom
        anchors.bottomMargin: DisplayInfo.lineheight * 4
        anchors.horizontalCenter: parent.horizontalCenter
        clip: true
 
        model: growers.growers
        //delegate switched depending if tablet or smartphone
        delegate: DisplayInfo.isTablet?growerDelegateTablet:growerDelegatePhone
        //cacheBuffer: 60
        onDragStarted: {
            Qt.inputMethod.hide()
        }
        Component.onCompleted: {
            console.log("listviewcompleted")
        }
    }

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Thx,
Patrik

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Added after 4 minutes:

Watching my code in a forum helped:
Problem was the conditional height setting in my delegate. Removing it stopped the weired behaviour.
patrik