如何检测 Unity3d 面板中的向上或向下滚动？

Question

我想检测向上或向下滚动。应该像下面的 Windows 表格。

private void dgv_Scroll(object sender, ScrollEventArgs e)
    {
        if (e.OldValue > e.NewValue)
        {
            // here up
        }
        else
        {
            // here down
        }
    }

public void OnScrollValueChanged(float value)
{
        if (?)
        {
            // here up
        }
        else
        {
            // here down
        }
}

Answer 1

Scrollbar and ScrollRect. Don't know which one you are using but here is a sample code to register to the onValueChanged event. You can find other UI events examples 有 onValueChanged 个。将对其进行修改以包含此答案中的样本。

您可能需要 Scrollbar。获取原始值，然后在开始时将其与滚动时的当前值进行比较。您可以使用它来确定上下。这假设 direction 设置为 TopToBottom.

scrollBar.direction = Scrollbar.Direction.TopToBottom;

滚动条:

public Scrollbar scrollBar;
float lastValue = 0;

void OnEnable()
{
    //Subscribe to the Scrollbar event
    scrollBar.onValueChanged.AddListener(scrollbarCallBack);
    lastValue = scrollBar.value;
}

//Will be called when Scrollbar changes
void scrollbarCallBack(float value)
{
    if (lastValue > value)
    {
        UnityEngine.Debug.Log("Scrolling UP: " + value);
    }
    else
    {
        UnityEngine.Debug.Log("Scrolling DOWN: " + value);
    }
    lastValue = value;
}

void OnDisable()
{
    //Un-Subscribe To Scrollbar Event
    scrollBar.onValueChanged.RemoveListener(scrollbarCallBack);
}

滚动矩形:

public ScrollRect scrollRect;

void OnEnable()
{
    //Subscribe to the ScrollRect event
    scrollRect.onValueChanged.AddListener(scrollRectCallBack);
}

//Will be called when ScrollRect changes
void scrollRectCallBack(Vector2 value)
{
    Debug.Log("ScrollRect Changed: " + value);
}

void OnDisable()
{
    //Un-Subscribe To ScrollRect Event
    scrollRect.onValueChanged.RemoveListener(scrollRectCallBack);
}

如何检测 Unity3d 面板中的向上或向下滚动？

How to detect scrolling up or down in panel for Unity3d?

c#

user-interface

unity3d

unity5

scrollrect