/// <summary>
/// 绘制行号
/// </summary>
/// <param name="richbox"></param>
/// <param name="component"></param>
public static void PaintLineNo(TextBoxBase richbox, Panel component)
{
Point point = richbox.Location;
int firstIndex = richbox.GetCharIndexFromPosition(point);
int firstLine = richbox.GetLineFromCharIndex(firstIndex);
Point firstPosition = richbox.GetPositionFromCharIndex(firstIndex);
point.Y += richbox.Height;
int lastIndex = richbox.GetCharIndexFromPosition(point);
int lastLine = richbox.GetLineFromCharIndex(lastIndex);
Point lastPosition = richbox.GetPositionFromCharIndex(lastIndex);
Graphics g = component.CreateGraphics();
Font font = new Font("微软雅黑", 9F, FontStyle.Regular, GraphicsUnit.Point, ((byte)(134)));
SolidBrush brush = new SolidBrush(Color.FromArgb(15, 180, 148));
Rectangle rect = component.ClientRectangle;
brush.Color = component.BackColor;
g.FillRectangle(brush, 0, 0, component.ClientRectangle.Width, component.ClientRectangle.Height);
brush.Color = Color.FromArgb(15, 180, 148);
int lineSpace = 0;
if (firstLine != lastLine)
{
lineSpace = (lastPosition.Y - firstPosition.Y) / (lastLine - firstLine);
}
else
{
lineSpace = (int)(Convert.ToInt32(richbox.Font.Size) * 1.6);
}
int brushX = component.ClientRectangle.Width - Convert.ToInt32(font.Size * 3.5);
int brushY = lastPosition.Y + Convert.ToInt32(font.Size * 0.21f);
int maxNum = 6;
int charWidth = 7;
int startWidth = 20;
int noLength = 0;
for (int i = lastLine; i >= 0; i--)
{
noLength = (i + 1).ToString().Length;
if (noLength <= maxNum)
{
g.DrawString((i + 1).ToString(), font, brush, brushX + (startWidth - (noLength - 1) * charWidth), brushY);
}
else
{
g.DrawString((i + 1).ToString(), font, brush, brushX, brushY);
}
brushY -= lineSpace;
}
g.Dispose();
font.Dispose();
brush.Dispose();
}
public static void TextBoxSelectionChanged(TextBoxBase textbox, Action <RowColumnIndex> notificationAct)
{
if (null == textbox)
{
return;
}
var line = textbox.GetLineFromCharIndex(textbox.SelectionStart);
var column = textbox.SelectionStart - textbox.GetFirstCharIndexOfCurrentLine();
//Debug.WriteLine("Line: {0}, Column: {1}", line, column);
RowColumnIndex rci = new RowColumnIndex()
{
Row = line + 1,
Column = column + 1,
SelectionLength = textbox.SelectionLength,
Length = textbox.TextLength,
};
if (notificationAct != null)
{
notificationAct(rci);
}
}
public static void GetLineAndPosFromIndex(this TextBoxBase self, int index, out int line, out int pos)
{
line = self.GetLineFromCharIndex(index);
int linepos = self.GetFirstCharIndexFromLine(line);
pos = index - linepos;
}
public static string GetCurrentLineData(this TextBoxBase textbox)
{
int pos = textbox.SelectionStart;
int line = textbox.GetLineFromCharIndex(pos);
if (line >= 0 && line < textbox.Lines.Length)
{
return(textbox.Lines[line]);
}
return(null);
}
public static void FastScrollToCaret(this TextBoxBase control)
{
if (control.IsHandleCreated)
{
var textLength = control.TextLength;
if (textLength == 0)
{
return;
}
bool flag = false;
object iunknown = null;
var iunkHandle = IntPtr.Zero;
try
{
if (SendMessage(new HandleRef(control, control.Handle), 1084, 0, out iunknown) != 0)
{
iunkHandle = Marshal.GetIUnknownForObject(iunknown);
if (iunkHandle != IntPtr.Zero)
{
var itextDocumentHandle = IntPtr.Zero;
var gUID = typeof(ITextDocument).GUID;
try
{
Marshal.QueryInterface(iunkHandle, ref gUID, out itextDocumentHandle);
var textDocument = Marshal.GetObjectForIUnknown(itextDocumentHandle) as ITextDocument;
if (textDocument != null)
{
int start = control.SelectionStart;
int lineFromCharIndex = control.GetLineFromCharIndex(start);
var textRange = textDocument.Range(start, start + control.SelectionLength);
textRange.ScrollIntoView(0); // scroll to start of selection
int num3 = (int)Win32.SendMessage(control.Handle, (Win32.WM) 206, IntPtr.Zero, IntPtr.Zero);
if (num3 > lineFromCharIndex)
{
textRange.ScrollIntoView(32);
}
flag = true;
}
}
finally
{
if (itextDocumentHandle != IntPtr.Zero)
{
Marshal.Release(itextDocumentHandle);
}
}
}
}
}
finally
{
if (iunkHandle != IntPtr.Zero)
{
Marshal.Release(iunkHandle);
}
}
if (!flag)
{
Win32.SendMessage(control.Handle, (Win32.WM) 183, IntPtr.Zero, IntPtr.Zero);
return;
}
}
else
{
control.ScrollToCaret();
}
}
public static int CurrentLineIndex(this TextBoxBase textBox) => textBox.GetLineFromCharIndex(textBox.SelectionStart);
