c# - 按下键盘键时如何更改 TrackBar 控件操作？

Question

TrackBar 控件的变化方向与它在被更改时应该的方向相反:向上翻页/向下翻页/向上箭头/向下箭头。

这里有详细介绍: Why does the Trackbar value decrease on arrow up/PgUp?

有没有办法修复/逆转这种行为？

Answer 1

嗯……我以前从没注意到。这是我对@Hans 的建议的尝试:

public class MyTrackBar : TrackBar
{

    protected override bool ProcessCmdKey(ref Message msg, Keys keyData)
    {
        switch (keyData)
        {
            case Keys.Up:
                this.Value = Math.Min(this.Value + this.SmallChange, this.Maximum);
                return true;

            case Keys.Down:
                this.Value = Math.Max(this.Value - this.SmallChange, this.Minimum);
                return true;

            case Keys.PageUp:
                this.Value = Math.Min(this.Value + this.LargeChange, this.Maximum);
                return true;

            case Keys.PageDown:
                this.Value = Math.Max(this.Value - this.LargeChange, this.Minimum);
                return true;
        }
        return base.ProcessCmdKey(ref msg, keyData);
    }

}