Flutter - 删除 Slider 中的默认填充

Question

我想知道如何删除Flutter Slider中的默认填充

当前的output是这样的，Slider的默认padding清晰可见

这是我的代码::

                    Positioned(
                      child: Align(
                        alignment: Alignment.bottomLeft,
                        child: SliderTheme(
                            data: SliderTheme.of(context).copyWith(
                              trackHeight: 2.0,
                              thumbColor: Colors.transparent,
                              thumbShape: RoundSliderThumbShape(enabledThumbRadius: 0.0),
                            ),
                            child: Container(
                                width: 380.0,
                                height: 20.0,
                                padding: EdgeInsets.all(0.0),
                                decoration: BoxDecoration(
                                  border: Border.all(color: Colors.blueAccent)
                                ),
                                child: Slider(
                                  value: 50,
                                  min: 1,
                                  max: 100,
                                  divisions: 100,
                                  activeColor: colors.primaryRed,
                                  inactiveColor: Colors.white,
                                  onChanged: (double newValue) {
                                    print(newValue);
                                  },
                                )
                            )
                        ),
                      ),
                    )

Answer 1

您可以像这样使用 costum trackShape 修复它：

将此行添加到 SliderTheme 数据：

trackShape: CustomTrackShape(),

然后在 CustomTrackShape() 中，您必须编写以下代码：

class CustomTrackShape extends RoundedRectSliderTrackShape {Rect getPreferredRect({
@required RenderBox parentBox,
Offset offset = Offset.zero,
@required SliderThemeData sliderTheme,
bool isEnabled = false,
bool isDiscrete = false,}) {final double trackHeight = sliderTheme.trackHeight;
final double trackLeft = offset.dx;
final double trackTop = offset.dy + (parentBox.size.height - trackHeight) / 2;
final double trackWidth = parentBox.size.width;
return Rect.fromLTWH(trackLeft, trackTop, trackWidth, trackHeight);}}

Answer 2

SliderThemeData(overlayShape: SliderComponentShape.noOverlay)

或者

overlayShape: SliderComponentShape.noThumb