从鼠标滚轮事件获取滚动条位置 [英] Getting Scrollbar position from Mouse wheel event

问题描述

我在winform中有一个小组。我想捕获面板的滚动和鼠标滚轮事件。对于这两种情况，我想检查滚动条位置。



当滚动条位于底部时，控件应该触发事件。



我为Panel.Scroll做了这样的事情：

I have a panel in winform. I want to capture both scroll and mouse wheel event for the panel. For both scenario I want to check the scroll bar position.

When scroll bar is at bottom the control should fire the event.

I have done this for Panel.Scroll like this:

private void Panel1_Scroll(object sender, ScrollEventArgs e)
{            
    if (e.NewValue == Panel1.VerticalScroll.Maximum-Panel1.VerticalScroll.LargeChange+1)
    {
      //do some operation
    }
}

但是对于MouseEventArgs，没有值（e.newvalue）表示滚动条位置。



如何从鼠标滚轮事件中获取滚动条位置？



另外根据我的要求，两个事件调用都有相同的逻辑实现，所以我想写逻辑一次。



我怎样才能实现这个目标？

But for MouseEventArgs there is no value (e.newvalue) to indicate scrollbar position.

How can I get the Scrollbar position from mouse wheel event ?

Also as per my requirement both event call have same logic implementation, so I want to write the logic once.

How can I achieve this ?

推荐答案

在你的方法中你可以检查 panel1.VerticalScroll.Value - 它相当于 e.NewValue



如果你想只写一次逻辑然后引入例程，例如

Within your method you can examine panel1.VerticalScroll.Value - it's the equivalent of e.NewValue

If you want to just write the logic once then introduce a routine e.g.

private void panel1_Scroll(object sender, ScrollEventArgs e)
{
    panel1_scrollcheck(e.NewValue);
}

private void panel1_MouseWheel(object sender, MouseEventArgs e)
{
    panel1_scrollcheck(panel1.VerticalScroll.Value);
}
private void panel1_scrollcheck(int currPos)
{
    if (currPos == panel1.VerticalScroll.Maximum - panel1.VerticalScroll.LargeChange + 1)
    {
        //do some operation
    }
}

假设你有一个Panel，'panel1，其滚动条在运行时有效 - 时间和一个TextBox，'textBox1：

Assuming you have a Panel, 'panel1, which has scrollbars active at run-time, and a TextBox, 'textBox1:

// in Form Load event or form contructor
panel1.MouseWheel += Panel1OnMouseWheel;

private void Panel1OnMouseWheel(object sender, MouseEventArgs e)
{
    textBox1.Text = string.Format("mouse: {0} wheel-delta: {1} panel scroll: {2}", e.Location.ToString(), e.Delta, panel1.VerticalScroll.Value);
}

你尝试过这样的事吗？发生了什么事？



典型的e.Delta值为＃120：车轮向前移动，＃-120车轮向后移动。

Have you tried working with something like this ? What happened ?

Typical e.Delta values are #120: wheel moved forward, and #-120 wheel moved back.

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