自定义Tab

protected void DrawTabStrip(Graphics g)
        {
            Rectangle rectTabStrip = ClientRectangle;
            foreach (Tab tab in Tabs)
            {
                if (Tabs.IndexOf(tab) == index)
                {
                    continue;
                }
                else
                    DrawTab(g,tab,GetRectangle(tab));
            }
            g.DrawLine(PenDocumentTabActiveBorder, rectTabStrip.Left, rectTabStrip.Bottom - 1,
                rectTabStrip.Right, rectTabStrip.Bottom - 1);
            DrawTab(g, Tabs[index], GetRectangle(Tabs[index]));
        }

 

    protected void DrawTab(Graphics g,Tab tab,Rectangle rect)
        {
            GraphicsPath path=GetTabOutline(rect, tab);
            if (Tabs.IndexOf(tab) == index)
            {
                g.FillPath(BrushDocumentActiveBackground, path);
                g.DrawPath(PenDocumentTabActiveBorder, path);
            }
            else
            {
                g.FillPath(new LinearGradientBrush(rect, SystemColors.ControlLightLight, SystemColors.ControlDark, LinearGradientMode.Vertical), path);
                g.DrawPath(PenDocumentTabInactiveBorder, path);
            }
            TextRenderer.DrawText(g, tab.Text, Font, rect, ColorDocumentInactiveText, DocumentTextFormat);
        }

 

        protected GraphicsPath GetTabOutline(Rectangle rect, Tab tab)
        {
            int curveSize = 6;
            GraphicsPath path = new GraphicsPath();
            if (Tabs.IndexOf(tab) == index || Tabs.IndexOf(tab) == 0)
            {
                path.AddLine(rect.Left, rect.Bottom, rect.Left - rect.Height / 2, rect.Bottom);
                path.AddLine(rect.Left - rect.Height / 2, rect.Bottom, rect.Left + rect.Height / 2 - curveSize / 2, rect.Top + curveSize / 2);
            }
            else
            {
                path.AddLine(rect.Left, rect.Bottom, rect.Left, rect.Bottom - rect.Height / 2);
                path.AddLine(rect.Left, rect.Bottom - rect.Height / 2, rect.Left + rect.Height / 2 - curveSize / 2, rect.Top + curveSize / 2);
            }

            path.AddLine(rect.Left + rect.Height / 2 + curveSize / 2, rect.Top, rect.Right - curveSize / 2, rect.Top);
            path.AddArc(new Rectangle(rect.Right - curveSize, rect.Top, curveSize, curveSize), -90, 90);
            path.AddLine(rect.Right, rect.Top + curveSize / 2, rect.Right, rect.Bottom);

            return path;
        }

 

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