/// <summary>
/// Handle drag and drop of text parts in the editor.
/// </summary>
/// <param name="s"></param>
/// <param name="e"></param>
private void HandleDragOver(object s, DragEventArgs e)
{
// convert cursor position to text position
var point = PointToClient(new Point(e.X, e.Y));
int pos = CharPositionFromPoint(point.X, point.Y);
// refresh text control
Refresh();
// if the mouse is over a selected area, dropping will not be possible
if (Selections.IndexOf(x => x.Start <= pos && pos < x.End) >= 0)
{
e.Effect = DragDropEffects.None;
return;
}
// draw line at cursor position in text
var g = CreateGraphics();
var pen = new Pen(Color.Black, 2);
var height = TextRenderer.MeasureText("0", Font).Height;
point.X = PointXFromPosition(pos);
point.Y = PointYFromPosition(pos);
g.DrawLine(pen, point.X, point.Y, point.X, point.Y + height);
// show "MOVE" cursor
e.Effect = DragDropEffects.Move;
}
