我想检测向上或向下滚动。应该像下面的Windows窗体。
private void dgv_Scroll(object sender, ScrollEventArgs e)
{
if (e.OldValue > e.NewValue)
{
// here up
}
else
{
// here down
}
}
如何在Unity3d的面板中检测向上或向下滚动?
public void OnScrollValueChanged(float value)
{
if (?)
{
// here up
}
else
{
// here down
}
}
答案 0 :(得分:1)
Scrollbar
和ScrollRect
有onValueChanged
。不知道你正在使用哪一个,但这里是一个注册到onValueChanged
事件的示例代码。您可以找到其他UI事件示例here。将修改它以包括来自此答案的样本。
您可能需要Scrollbar
。获取原始值,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向上和向下。这假定direction
设置为TopToBottom
。
scrollBar.direction = Scrollbar.Direction.TopToBottom;
<强>滚动条:强>
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);
}
<强> scrollRect的:强>
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);
}