/// <summary>
/// Sends a win32 message to get the scrollbars' position.
/// </summary>
/// <returns>a POINT structore containing horizontal and vertical scrollbar position.</returns>
private unsafe Win32.POINT GetScrollPos()
{
Win32.POINT res = new Win32.POINT();
IntPtr ptr = new IntPtr(&res);
Win32.SendMessage(Handle, Win32.EM_GETSCROLLPOS, 0, ptr);
return(res);
}
public UndoRedoInfo(string text, Win32.POINT scrollPos, int cursorLoc)
{
Text = text;
ScrollPos = scrollPos;
CursorLocation = cursorLoc;
}
/// <summary>
/// The on text changed overrided. Here we parse the text into RTF for the highlighting.
/// </summary>
/// <param name="e"></param>
protected override void OnTextChanged(EventArgs e)
{
if (mParsing)
{
return;
}
if (this.HighlightDescriptors.Count == 0)
{
base.OnTextChanged(e);
OnItemTextChanged(new ItemTextChangedEventArgs(this));
return;
}
mParsing = true;
Win32.SendMessage(Handle, Win32.WM_SETREDRAW, 0, (IntPtr)0);
base.OnTextChanged(e);
if (!mIsUndo)
{
mRedoStack.Clear();
mUndoList.Insert(0, mLastInfo);
this.LimitUndo();
mLastInfo = new UndoRedoInfo(Text, GetScrollPos(), SelectionStart);
}
//Save scroll bar an cursor position, changeing the RTF moves the cursor and scrollbars to top positin
Win32.POINT scrollPos = GetScrollPos();
int cursorLoc = SelectionStart;
this.Select(0, this.Text.Length);
this.SelectionFont = Parent.Font;
this.SelectionColor = SystemColors.WindowText;
int lastPos;
int tokenLength;
string token;
foreach (HighlightDescriptor hd in this.HighlightDescriptors)
{
token = hd.Token.Replace("\t", " ");
token = token.Replace("\v", ".");
lastPos = 0;
tokenLength = token.Length;
while (true)
{
lastPos = this.Find(token, lastPos, RichTextBoxFinds.WholeWord);
if (lastPos == -1 || lastPos >= this.Text.Length)
{
break;
}
this.Select(lastPos, tokenLength);
this.SelectionColor = hd.Color;
this.Select(lastPos + tokenLength, 1);
this.SelectionColor = SystemColors.WindowText;
lastPos += 1;
}
}
//Restore cursor and scrollbars location.
this.SelectionStart = cursorLoc;
this.SelectionLength = 0;
SetScrollPos(scrollPos);
Win32.SendMessage(Handle, Win32.WM_SETREDRAW, 1, (IntPtr)0);
Invalidate();
if (mAutoCompleteShown)
{
if (mFilterAutoComplete)
{
SetAutoCompleteItems();
SetAutoCompleteSize();
SetAutoCompleteLocation(false);
}
SetBestSelectedAutoCompleteItem();
}
mParsing = false;
OnItemTextChanged(new ItemTextChangedEventArgs(this));
}
/// <summary>
/// Sends a win32 message to set scrollbars position.
/// </summary>
/// <param name="point">a POINT conatining H/Vscrollbar scrollpos.</param>
private unsafe void SetScrollPos(Win32.POINT point)
{
IntPtr ptr = new IntPtr(&point);
Win32.SendMessage(Handle, Win32.EM_SETSCROLLPOS, 0, ptr);
}
/// <summary>
/// Sends a win32 message to get the scrollbars' position.
/// </summary>
/// <returns>a POINT structore containing horizontal and vertical scrollbar position.</returns>
private unsafe Win32.POINT GetScrollPos()
{
Win32.POINT res = new Win32.POINT();
IntPtr ptr = new IntPtr(&res);
Win32.SendMessage(Handle, Win32.EM_GETSCROLLPOS, 0, ptr);
return res;
}
public UndoRedoInfo(string text, Win32.POINT scrollPos, int cursorLoc)
{
Text = text;
ScrollPos = scrollPos;
CursorLocation = cursorLoc;
}