flutter - 在 ListView 中拉动刷新而不拉动动画

Question

我在 RefreshIndicator 和 SmartRefresher 中使用了 ListView，但问题是当我拉下它时，它会为拉动设置动画。我不想显示拉动动画。我曾尝试使用 clampscrollphysics 来禁用拉动动画，但如果我使用它，刷新将不起作用。所以请让我知道如何进行拉动刷新，它会显示刷新指示器，也会刷新但不会显示带有列表视图的下拉动画

标签： flutter

Answer 1

将自定义物理课程应用到您的列表视图中。

  ListView.builder(
          physics: Custom2ScrollPhysics()
  )

Custom2ScrollPhysics 类

    class Custom2ScrollPhysics extends ScrollPhysics {
      /// Creates scroll physics that prevent the scroll offset from exceeding the
      /// bounds of the content..
      const Custom2ScrollPhysics({ScrollPhysics parent}) : super(parent: parent);

      @override
      Custom2ScrollPhysics applyTo(ScrollPhysics ancestor) {
        return Custom2ScrollPhysics(parent: buildParent(ancestor));
      }

      @override
      double applyBoundaryConditions(ScrollMetrics position, double value) {
        assert(() {
          if (value == position.pixels) {
            throw FlutterError('$runtimeType.applyBoundaryConditions() was called redundantly.\n'
                'The proposed new position, $value, is exactly equal to the current position of the '
                'given ${position.runtimeType}, ${position.pixels}.\n'
                'The applyBoundaryConditions method should only be called when the value is '
                'going to actually change the pixels, otherwise it is redundant.\n'
                'The physics object in question was:\n'
                '  $this\n'
                'The position object in question was:\n'
                '  $position\n');
          }
          return true;
        }());
        if (value < position.pixels && position.pixels <= position.minScrollExtent) // underscroll
          return value - position.pixels;
        if (position.maxScrollExtent <= position.pixels && position.pixels < value) // overscroll
          return value - position.pixels;
        if (value < position.minScrollExtent && position.minScrollExtent < position.pixels) // hit top edge
          return value - position.minScrollExtent;
        if (position.pixels < position.maxScrollExtent && position.maxScrollExtent < value) // hit bottom edge
          return value - position.maxScrollExtent;
        return 0.0;
      }

      @override
      Simulation createBallisticSimulation(ScrollMetrics position, double velocity) {
        final Tolerance tolerance = this.tolerance;
        if (position.outOfRange) {
          double end;
          if (position.pixels > position.maxScrollExtent) end = position.maxScrollExtent;
          if (position.pixels < position.minScrollExtent) end = position.minScrollExtent;
          assert(end != null);
          return ScrollSpringSimulation(spring, position.pixels, end, min(0.0, velocity), tolerance: tolerance);
        }
        if (velocity.abs() < tolerance.velocity) return null;
        if (velocity > 0.0 && position.pixels >= position.maxScrollExtent) return null;
        if (velocity < 0.0 && position.pixels <= position.minScrollExtent) return null;
        return ClampingScrollSimulation(
          position: position.pixels,
          velocity: velocity,
          tolerance: tolerance,
        );
      }
    }