PinchSlider 是如何配置的？

Question

我第一次尝试使用滑块组件，立即出现了一些问题：

如何使滑块与刻度线的位置对齐？
- 如果那不可能，它们有什么用？
- 如果我想在不步进的情况下滑动，如何更改标记的数量或删除所有标记？
为什么，当我更改 Slider Track 设置时，视觉效果没有调整？

我已经在功能请求中看到了这一点 ;)

Answer 1

这些问题可能最好作为问题提交到 MRTK github 页面上。 here's a link to file an issue.

但是，在这里为未来的访客回答您的问题：

如何使滑块与刻度线的位置对齐？

默认 PinchSlider 不提供该功能，但这里有一个示例，说明如何通过扩展 pinchslider（参考：issue 4140

public class SliderWithSnapPoints : PinchSlider
    {
        [SerializeField]
        [Tooltip("The number of snap points")]
        float snapPoints = 100;

        float lastSnapPoint;
        float snapPointSize;

        public override void OnPointerDown(MixedRealityPointerEventData eventData)
        {
            base.OnPointerDown(eventData);
            if (eventData.used)
            {
                lastSnapPoint = SliderValue;
                snapPointSize = 1f / snapPoints;
            }
        }

        /// <summary>
        /// Handle slider value changes by dragging, and commit these changes.
        /// </summary>
        /// <remarks>
        /// Note, this requires the MRTK pinch slider to implement this function signature,
        /// and the pinch slider needs to call this function instead of instead setting SliderValue 
        /// directly.
        /// </remarks>
        protected override void OnPointerDragged(float newSliderValue)
        {
            var valueChange = Mathf.Abs(lastSnapPoint - newSliderValue);
            if (valueChange >= snapPointSize)
            {
                lastSnapPoint = SliderValue = newSliderValue;
            }
        }
    }

如果我想在不步进的情况下滑动，如何更改标记的数量或删除所有标记？

您可以只删除或禁用场景层次结构中的刻度线。

为什么，当我更改 Slider Track 设置时，视觉效果没有调整？

视觉效果不会调整，因为它们与捕捉点的数量无关，它们只是提供视觉指导。

Answer 2

我稍微修改了这个实现：

using Microsoft.MixedReality.Toolkit.UI;
using UnityEngine;

public class SliderWithSnapPoints : PinchSlider
{
#pragma warning disable 649
    [Tooltip("The number of snap points")]
    [Min(2)]
    [SerializeField] private int snapPoints = 5;
#pragma warning restore 649

    /// <summary>
    /// Handle slider value changes by dragging, and commit snap point aligned changes.
    /// </summary>
    /// <remarks>
    /// Note, this requires the MRTK pinch slider to implement this function signature,
    /// and the pinch slider needs to call this function instead of setting SliderValue 
    /// directly.
    /// </remarks>
    protected override void OnPointerDragged(float newSliderValue)
    {
        float gap = 1f / (snapPoints - 1f);
        newSliderValue = 0.5f * gap + newSliderValue;
        newSliderValue -= (newSliderValue % gap);

        SliderValue = newSliderValue;
    }
}

正如评论所建议的那样，您还必须从以下位置编辑主 PinchSlider 脚本：

public void OnPointerDragged(MixedRealityPointerEventData eventData)
{
    if (eventData.Pointer == activePointer && !eventData.used)
    {
        var delta = activePointer.Position - startPointerPosition;
        var handDelta = Vector3.Dot(SliderTrackDirection.normalized, delta);

        SliderValue = Mathf.Clamp(startSliderValue + handDelta / SliderTrackDirection.magnitude, 0, 1);

        // Mark the pointer data as used to prevent other behaviors from handling input events
        eventData.Use();
    }
}

收件人：

public void OnPointerDragged(MixedRealityPointerEventData eventData)
{
    if (eventData.Pointer == activePointer && !eventData.used)
    {
        var delta = activePointer.Position - startPointerPosition;
        var handDelta = Vector3.Dot(SliderTrackDirection.normalized, delta);

        OnPointerDragged(Mathf.Clamp(startSliderValue + handDelta / SliderTrackDirection.magnitude, 0, 1));

        // Mark the pointer data as used to prevent other behaviors from handling input events
        eventData.Use();
    }
}

protected virtual void OnPointerDragged(float newSliderValue)
{
    SliderValue = newSliderValue;
}

PinchSlider 是如何配置的？

How is the PinchSlider meant to be configured?

mrtk