ObjectListView 中带有文本的进度列

Question

我有一个表 (ObjectListView)，其中包含行中的音频记录。 其中一列 - 格式为 hh:mm:ss 的长度 我必须将 BarRenderer 应用到此列才能在此列中显示播放进度（进度和长度）。 我应该编写自己的渲染器还是可以使用任何现有的渲染器？

Answer 1

我使用派生自 BarRenderer 的自定义类实现了这一点。考虑重写的 Render 方法。

public class BarTextRenderer : BarRenderer
{
    #region Constructors

    /// <summary>
    /// Make a BarTextRenderer
    /// </summary>
    public BarTextRenderer() : base() {}

    /// <summary>
    /// Make a BarTextRenderer for the given range of data values
    /// </summary>
    public BarTextRenderer (int minimum, int maximum) : base(minimum, maximum) { }

    /// <summary>
    /// Make a BarTextRenderer using a custom bar scheme
    /// </summary>
    public BarTextRenderer (Pen pen, Brush brush) : base(pen, brush) { }
    /// <summary>
    /// Make a BarTextRenderer using a custom bar scheme
    /// </summary>
    public BarTextRenderer (int minimum, int maximum, Pen pen, Brush brush) : base(minimum, maximum, pen, brush) { }

    /// <summary>
    /// Make a BarTextRenderer that uses a horizontal gradient
    /// </summary>
    public BarTextRenderer (Pen pen, Color start, Color end) : base(pen, start, end) { }

    /// <summary>
    /// Make a BarTextRenderer that uses a horizontal gradient
    /// </summary>
    public BarTextRenderer (int minimum, int maximum, Pen pen, Color start, Color end) : base(minimum, maximum, pen, start, end) { }

    #endregion

  public override void Render(Graphics g, Rectangle r)
  {
    base.Render(g, r);
    float x = r.X + (float)r.Width / 2f;
    float w = r.Width/2f;
    float h = Math.Max (r.Height-this.Font.Size, 0.8f*r.Height);
    float y = (float)r.Y + 0.6f*(r.Height-h);

    RectangleF rf = new RectangleF(x, y, w, h);
    g.DrawString(this.Aspect.ToString(), this.Font, this.Brush, rf);
  }
}