[Qt5] PathView flicks very very slow at some point



  • The code works well when Qt 4.

    It's like an advertising column.

    @
    import QtQuick 2.0

    Rectangle {
    id: desktop
    width: 1258
    height: 697
    color: "red"

    ListModel {
    id: ads_model
    ListElement {
    color: "green"
    }
    ListElement {
    color: "blue"
    }
    ListElement {
    color: "yellow"
    }
    }

    PathView {
    id: path_view
    anchors.fill: parent
    model: ads_model
    delegate: Rectangle {
    id: homepage_game
    width: 878;
    height: 405
    z: 2 + index / 10
    scale: PathView.scale
    color: model.color
    }

    focus: true

         preferredHighlightBegin: 0.5
         preferredHighlightEnd: 0.5
    

    flickDeceleration: 380

        path: Path {
    

    startX: 180 - (ads_model.count - 1) * 440; startY: 280
    PathAttribute { name: "scale"; value: 0.618 }
    PathLine { x: desktop.width / 2; y: 280 }
    PathAttribute { name: "scale"; value: 1.0 }
    PathLine { x: desktop.width - 180 + (ads_model.count - 1) * 440; y: 280 }
    }
    }
    }
    @

    There are 3 rectangles that can be horizontally dragged. Whenever releasing the mouse, the rectangle flicks to the left or right (according to its position)

    Normally, it works well. But occasionally there's a problem:

    I try to drag a rectangle to such a position, that about half of this rectangle can be seen ( the other half is clipped by the window ), then the rectangle moves to the destination position at a very low speed.

    This position is not easy to be found so the 'low speed situation' is not easy to reproduce. I can reproduce it after trying about 5 times. The 'slow' is quite obvious compared to the normal situation.

    When I'm using Qt4, there's no such situation.. Is it a bug of Qt5, or the usage of PathView changed in Qt5 ?

    I'm using WinXP.

    Thanks in advance


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