public static void SetInnerMargin(this TextBoxBase textBox, int left, int top, int right, int bottom)
{
var rect = textBox.GetFormattingRect();
var newRect = new Rectangle(left, top, rect.Width - left - right, rect.Height - top - bottom);
textBox.SetFormattingRect(newRect);
}
public static (int left, int top, int right, int bottom) GetInnerMargins(this TextBoxBase textBox)
{
Rectangle rect = textBox.GetFormattingRect();
int rightMargin = textBox.ClientRectangle.Width - (rect.Width + rect.Left);
int bottomMargin = textBox.ClientRectangle.Height - (rect.Height + rect.Top);
var newRect = new Rectangle(rect.Left, rect.Top, rightMargin, bottomMargin); // Width = right, Height = bottom
return(newRect.Left, newRect.Top, newRect.Width, newRect.Height);
}
// GetFormattingRect
// *********************************************** set_margins
public static void set_margins(this TextBoxBase textbox,
int left,
int top,
int right,
int bottom)
{
Rectangle rect = textbox.GetFormattingRect();
Rectangle rectangle = new Rectangle(
left,
top,
(rect.Width - left - right),
(rect.Height - top - bottom));
textbox.SetFormattingRect(rectangle);
}