protected override void OnRenderMenuItemBackground(ToolStripItemRenderEventArgs e)
{
if (currentRenderer != null)
{
currentRenderer.DrawMenuItemBackground(e);
}
else
{
base.OnRenderMenuItemBackground(e);
}
}
// Let the item paint itself, and then paint the RadioButton
// where the check mark is displayed, covering the check mark
// if it is present.
protected override void OnPaint(PaintEventArgs e)
{
// If the client sets the Image property, the selection behavior
// remains unchanged, but the RadioButton is not displayed and the
// selection is indicated only by the selection rectangle.
if (Image != null)
{
base.OnPaint(e);
return;
}
// Determine the correct state of the RadioButton.
RadioButtonState buttonState = RadioButtonState.UncheckedNormal;
if (Enabled)
{
if (mouseDownState)
{
if (Checked)
{
buttonState = RadioButtonState.CheckedPressed;
}
else
{
buttonState = RadioButtonState.UncheckedPressed;
}
}
else if (mouseHoverState)
{
if (Checked)
{
buttonState = RadioButtonState.CheckedHot;
}
else
{
buttonState = RadioButtonState.UncheckedHot;
}
}
else if (Checked)
{
buttonState = RadioButtonState.CheckedNormal;
}
}
else if (Checked)
{
buttonState = RadioButtonState.CheckedDisabled;
}
else
{
buttonState = RadioButtonState.UncheckedDisabled;
}
// Calculate the rectangle at which to display the RadioButton.
Size glyphSize = RadioButtonRenderer.GetGlyphSize(e.Graphics, buttonState);
Rectangle contentRect = this.ContentRectangle;
Point imageLocation = contentRect.Location;
float scale = e.Graphics.DpiX / 96f;
imageLocation.Offset((int)Math.Round(5f * scale, MidpointRounding.AwayFromZero), (contentRect.Height - glyphSize.Height) / 2);
ToolStripRenderer renderer = Owner?.Renderer;
if (renderer != null)
{
renderer.DrawMenuItemBackground(new ToolStripItemRenderEventArgs(e.Graphics, this));
int x = (int)(32 * scale);
e.Graphics.SetClip(new Rectangle(x, contentRect.Y, Math.Max(contentRect.Width - x, 0), contentRect.Height));
base.OnPaint(e);
e.Graphics.ResetClip();
}
else
{
base.OnPaint(e);
}
// If the item is selected and the RadioButton paints with partial
// transparency, such as when theming is enabled, the check mark
// shows through the RadioButton image. In this case, paint a
// non-transparent background first to cover the check mark.
if (Checked && RadioButtonRenderer.IsBackgroundPartiallyTransparent(buttonState))
{
e.Graphics.FillEllipse(SystemBrushes.Control, new Rectangle(imageLocation.X, imageLocation.Y, glyphSize.Width - 1, glyphSize.Height - 1));
}
RadioButtonRenderer.DrawRadioButton(e.Graphics, imageLocation, buttonState);
}
protected override void OnRenderMenuItemBackground(ToolStripItemRenderEventArgs e)
{
ActualRenderer.DrawMenuItemBackground(e);
}
