Question

我正在尝试创建一个自定义标签控件，它可以工作，但只有两件事我无法工作。

第一个问题; 我正在尝试在所选的选项卡之前添加一个填充的矩形，但是当我选择另一个选项卡时，它会保留在第一个选项卡中。

第二个问题; 这不是一个真正的问题，但可以改变这些tabitems的宽度吗？

The problem

这是代码;

        protected override void OnPaint(System.Windows.Forms.PaintEventArgs e)
    {
        System.Drawing.Bitmap b = new System.Drawing.Bitmap(Width, Height);
        System.Drawing.Graphics g = System.Drawing.Graphics.FromImage(b);
        g.Clear(System.Drawing.Color.FromArgb(246, 247, 249));

        for (int i = 0; i <= TabCount - 1; i++)
        {
            System.Drawing.Rectangle tabRectangle = GetTabRect(i);
            if (SelectedIndex == i)
            {
                //tab is selected
                System.Drawing.SolidBrush lightBlue = new System.Drawing.SolidBrush(System.Drawing.Color.FromArgb(239, 242, 247));
                g.FillRectangle(lightBlue, tabRectangle);

                // I can't get this working..
                System.Drawing.SolidBrush sele = new System.Drawing.SolidBrush(System.Drawing.Color.FromArgb(65, 95, 155));
                g.FillRectangle(sele, new System.Drawing.Rectangle(0, 0, 5, 32));
            }
            else
            {
                //tab is not selected
                g.FillRectangle(System.Drawing.Brushes.White, tabRectangle);
            }

            System.Drawing.SolidBrush fontColor = new System.Drawing.SolidBrush(System.Drawing.Color.FromArgb(100, 99, 104));

            g.DrawString(TabPages[i].Text, Font, fontColor, tabRectangle, new System.Drawing.StringFormat { Alignment = System.Drawing.StringAlignment.Near, LineAlignment = System.Drawing.StringAlignment.Center });
        }

        e.Graphics.DrawImage(b, 0, 0);
        b.Dispose();
        g.Dispose();
        base.OnPaint(e);
    }

感谢。

Answer 1

您需要更改第二个矩形的位置，使其从与第一个矩形相同的位置开始：

//tab is selected
System.Drawing.SolidBrush lightBlue = new System.Drawing.SolidBrush(System.Drawing.Color.FromArgb(239, 242, 247));
g.FillRectangle(lightBlue, tabRectangle);

// I can't get this working..
System.Drawing.SolidBrush sele = new System.Drawing.SolidBrush(System.Drawing.Color.FromArgb(65, 95, 155));
g.FillRectangle(sele, new System.Drawing.Rectangle(
     tabRectangle.X,tabRectangle.Y,
     5, 32));

Answer 2

您需要调用Invalidate()强制控件重绘这将重新触发OnPaint来电。

g.FillRectangle只工作一次

2 个答案: