C#如何使FlowLayoutPanel支持中键滚轮滚动？

2020-08-21 15:58:57 | CSharp | 2k+ Reads

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FlowLayoutPanel控件不直接支持MouseWheel事件.即滚动滚轮也不会响应.所以必须手动来支持响应滚轮.

查看了一下FlowLayoutPanel控件的源码,原来FlowLayoutPanel控件是继承于Panel控件的.
所以,Panel控件也是直接不支持MouseWheel事件来进行滚动滚轮的.

源码：

///
/// 支持滚轮的FlowLayoutPanel.
///
class ScrollFlowLayoutPanel : FlowLayoutPanel
{
    public ScrollFlowLayoutPanel()
    {

    }

    protected override void OnMouseClick(MouseEventArgs e)
    {
        this.Focus();
        base.OnMouseClick(e);
    }


    protected override void OnMouseEnter(EventArgs e)
    {
        this.Focus();
        base.OnMouseEnter(e);
    }

    protected override void OnMouseWheel(MouseEventArgs e)
    {
        if (e.Delta < 0)
        {
            if (this.VerticalScroll.Maximum > this.VerticalScroll.Value + 50)
                this.VerticalScroll.Value += 50;
            else
                this.VerticalScroll.Value = this.VerticalScroll.Maximum;
        }
        else
        {
            if (this.VerticalScroll.Value > 50)
                this.VerticalScroll.Value -= 50;
            else
            {
                this.VerticalScroll.Value = 0;
            }
        }

    }
}

使用方法：

在Winform的后台代码添加了这个类之后，你就可以从工具箱里面找到ScrollFlowLayoutPanel。

与FlowLayoutPanel不同的是，你可以从它的属性中找到AutoScroll，并可以设置为True。

补充：

但是实际测试，会有抖动。（原因暂时未知）

参考来源：

http://blog.sina.com.cn/s/blog_6b965dd70101po76.html

This article was last edited at 2020-08-21 15:58:57