public void DrawTabItemBackground(TabStripItemRenderEventArgs e)
{
OnRenderTabItemBackground(e);
var handler = Events[EventRenderTabItemBackground] as ToolStripItemRenderEventHandler;
if (handler != null)
{
handler(this, e);
}
}
protected override void OnRenderTabItemBackground(TabStripItemRenderEventArgs e)
{
var rect = new Rectangle(0, 0, e.Item.Width - 1, e.Item.Height - 1);
e.Graphics.DrawRectangle(Pens.Green, rect);
rect.Offset(e.Item.Padding.Left, e.Item.Padding.Top);
rect.Width -= e.Item.Padding.Horizontal;
rect.Height -= e.Item.Padding.Vertical;
e.Graphics.DrawRectangle(Pens.Red, rect);
DrawDottedRectangle(e.Graphics, Color.Black, e.CloseButtonRectangle);
var tab = e.Item as TabStripButton;
if (tab != null)
{
using (var font = new Font("Segoe UI", 10, FontStyle.Bold))
{
int tabIndex = 0;
foreach (var item in e.ToolStrip.Items)
{
if (item == tab)
{
goto Render;
}
if (item is TabStripButton)
{
++tabIndex;
}
}
tabIndex = -1;
Render:
TextRenderer.DrawText(
e.Graphics,
tabIndex.ToString(CultureInfo.CurrentUICulture),
font,
rect,
Color.Red,
TextFormatFlags.Left
);
}
}
}
private static void RenderTabItemBackgroundUsingVisualStyles(TabStripItemRenderEventArgs e, bool isChecked)
{
e.Graphics.SmoothingMode = SmoothingMode.AntiAlias;
using (GraphicsPath outer = GetTabBorderPath(e.Item.Width, e.Item.Height, isChecked, false))
{
var colors = NormalColors;
if (e.Item.Enabled && isChecked)
{
colors = CheckedColors;
}
else if (e.Item.Selected)
{
colors = SelectedColors;
}
FillGradient(e.Graphics, outer, colors, TabBackgroundRatio);
using (Pen pen = new Pen(TabBorderColor, 1))
{
e.Graphics.DrawPath(Pens.Gray, outer);
}
using (GraphicsPath inner = GetTabBorderPath(e.Item.Width, e.Item.Height, isChecked, true))
{
e.Graphics.DrawPath(Pens.White, inner);
}
}
if (!e.CloseButtonRectangle.IsEmpty)
{
var element = VisualStyleElement.ToolTip.Close.Normal;
if (e.CloseButtonState == TabStripCloseButtonState.Selected)
{
element = VisualStyleElement.ToolTip.Close.Hot;
}
if (e.CloseButtonState == TabStripCloseButtonState.Pressed)
{
element = VisualStyleElement.ToolTip.Close.Pressed;
}
VisualStyleRenderer renderer = new VisualStyleRenderer(element);
renderer.DrawBackground(e.Graphics, e.CloseButtonRectangle);
}
}
protected override void OnRenderTabItemBackground(TabStripItemRenderEventArgs e)
{
var isChecked = false;
var button = e.Item as ToolStripButton;
if (button != null && button.Checked)
{
isChecked = true;
}
if (VisualStylesAvailable)
{
RenderTabItemBackgroundUsingVisualStyles(e, isChecked);
}
else
{
var rect = new Rectangle(0, 0, e.Item.Width - 1, e.Item.Height - 1);
if (isChecked)
{
using (var brush = new LinearGradientBrush(rect,
SystemColors.ControlLightLight,
SystemColors.Control,
LinearGradientMode.Vertical))
{
e.Graphics.FillRectangle(brush, rect);
}
}
ControlPaint.DrawBorder3D(e.Graphics, rect, Border3DStyle.Raised,
Border3DSide.Left | Border3DSide.Top | Border3DSide.Right);
if (!e.CloseButtonRectangle.IsEmpty)
{
var closeRect = e.CloseButtonRectangle;
if (e.CloseButtonState != TabStripCloseButtonState.Pressed)
{
closeRect.Offset(-2, -2);
}
using (var marlett = new Font("Marlett", 8))
{
TextRenderer.DrawText(e.Graphics, "r", marlett, closeRect, SystemColors.ControlText);
}
}
}
}
protected virtual void OnRenderTabItemBackground(TabStripItemRenderEventArgs e)
{
}
protected virtual void OnPaintBackground(TabStripItemRenderEventArgs e)
{
Renderer.DrawTabItemBackground(e);
}
