c# - Scrollable Control 滚动条总是归零

Question

希望这是一个简单的过程!

我从 UserControl 派生，我正在覆盖 OnPaint。我希望此控件可滚动，但我想要的只是能够获取滚动条的值并自行处理在何处绘制所有内容。我已经设置了以下内容:

// How the hell do I get this scrolling to not return to zero?
this.Scroll += new ScrollEventHandler(TimelineControl_Scroll);

this.HorizontalScroll.Enabled = true;
this.HorizontalScroll.Visible = true;
this.HorizontalScroll.Minimum = 0;

this.VerticalScroll.Enabled = false;
this.VerticalScroll.Visible = true;

this.AutoScroll = false;

我看到了滚动位置的新值。但是，滚动条总是返回到零。我做错了什么？

Answer 1

我无法对代码试图做什么进行逆向工程。 AutoScroll 是您的 friend 。这是一个例子:

public partial class UserControl1 : UserControl {
    public UserControl1() {
        InitializeComponent();
        this.SetStyle(ControlStyles.ResizeRedraw, true);
        this.AutoScroll = true;
        this.AutoScrollMinSize = new Size(1000, 0);
    }
    protected override void OnScroll(ScrollEventArgs se) {
        base.OnScroll(se);
        this.Invalidate();
    }
    protected override void OnPaint(PaintEventArgs e) {
        e.Graphics.TranslateTransform(this.AutoScrollPosition.X, this.AutoScrollPosition.Y);
        e.Graphics.DrawLine(Pens.Black, 0, 0, 1000, this.ClientSize.Height);
        base.OnPaint(e);
    }
}