protected override void OnPaint(PaintEventArgs e)
{
int currentXPos = 0;
const int currentYPos = 0;
bool adjustScrollBars = false;
Graphics g = e.Graphics;
Rectangle clipRectangle = e.ClipRectangle;
bool isFullRepaint = clipRectangle.X == 0 && clipRectangle.Y == 0 && clipRectangle.Width == Width && clipRectangle.Height == Height;
g.TextRenderingHint = TextEditorProperties.TextRenderingHint;
if (updateMargin != null)
{
updateMargin.Paint(g, updateMargin.DrawingPosition);
// clipRectangle.Intersect(updateMargin.DrawingPosition);
}
if (clipRectangle.Width <= 0 || clipRectangle.Height <= 0)
{
return;
}
foreach (AbstractMargin margin in leftMargins)
{
if (margin.IsVisible)
{
Rectangle marginRectangle = new Rectangle(currentXPos, currentYPos, margin.Size.Width, Height - currentYPos);
if (marginRectangle != margin.DrawingPosition)
{
// margin changed size
if (!isFullRepaint && !clipRectangle.Contains(marginRectangle))
{
Invalidate(); // do a full repaint
}
adjustScrollBars = true;
margin.DrawingPosition = marginRectangle;
}
currentXPos += margin.DrawingPosition.Width;
if (clipRectangle.IntersectsWith(marginRectangle))
{
marginRectangle.Intersect(clipRectangle);
if (!marginRectangle.IsEmpty)
{
margin.Paint(g, marginRectangle);
}
}
}
}
Rectangle textViewArea = new Rectangle(currentXPos, currentYPos, Width - currentXPos, Height - currentYPos);
if (textViewArea != textView.DrawingPosition)
{
adjustScrollBars = true;
textView.DrawingPosition = textViewArea;
// update caret position (but outside of WM_PAINT!)
BeginInvoke((MethodInvoker)caret.UpdateCaretPosition);
}
if (clipRectangle.IntersectsWith(textViewArea))
{
textViewArea.Intersect(clipRectangle);
if (!textViewArea.IsEmpty)
{
textView.Paint(g, textViewArea);
}
}
if (adjustScrollBars)
{
motherTextAreaControl.AdjustScrollBars();
}
// we cannot update the caret position here, it's not allowed to call the caret API inside WM_PAINT
//Caret.UpdateCaretPosition();
base.OnPaint(e);
}
