| public GetPositionFromCharIndex ( int index ) : Point | ||
| index | int | |
| Résultat | Point | |
/// <remarks>
/// GetCharIndexFromPosition is missing one caret position, as there is
/// one extra caret position than there are characters (an extra one at
/// the end). See http://stackoverflow.com/a/3874132.
/// </remarks>
public static int GetCaretIndex(TextBoxBase @this, Point point)
{
point = @this.PointToClient(point);
var index = @this.GetCharIndexFromPosition(point);
if (index == (@this.TextLength - 1))
{
var caretPoint = @this.GetPositionFromCharIndex(index);
if (caretPoint.X < point.X) index += 1;
}
return index;
}
/// <summary>
/// Sets the location of the AutoComplete form, maiking sure it's on the screen where the cursor is.
/// </summary>
/// <param name="moveHorizontly">determines wheather or not to move the form horizontly.</param>
private void SetAutoCompleteLocation(TextBoxBase control, bool moveHorizontly)
{
Point cursorLocation = control.GetPositionFromCharIndex(control.SelectionStart);
Screen screen = Screen.FromPoint(cursorLocation);
Point optimalLocation = new Point(PointToScreen(cursorLocation).X - 15, (int)(PointToScreen(cursorLocation).Y + Font.Size * 2 + 2));
Rectangle desiredPlace = new Rectangle(optimalLocation, this.Size);
desiredPlace.Width = 152;
if (desiredPlace.Left < screen.Bounds.Left)
{
desiredPlace.X = screen.Bounds.Left;
}
if (desiredPlace.Right > screen.Bounds.Right)
{
desiredPlace.X -= (desiredPlace.Right - screen.Bounds.Right);
}
if (desiredPlace.Bottom > screen.Bounds.Bottom)
{
desiredPlace.Y = cursorLocation.Y - 2 - desiredPlace.Height;
}
if (!moveHorizontly)
{
desiredPlace.X = this.Left;
}
this.Bounds = desiredPlace;
}
private System.Drawing.Point GetCurrentCoordinates(TextBoxBase control)
{
// note, get rid of the "+1" if you want the coordinates to be zero based
//Point p = new System.Drawing.Point();
//p.Y = (rtb.GetLineFromCharIndex(rtb.SelectionStart)) + 1;
//p.X = (rtb.SelectionStart - rtb.GetFirstCharIndexOfCurrentLine()) + 1;
Point point = control.GetPositionFromCharIndex(control.SelectionStart);
// FIX for textbox
if(point.X ==0 && point.Y == 0)
{
if (control.SelectionStart > 0)
{
point = control.GetPositionFromCharIndex(control.SelectionStart - 1);
}
}
return point;
}
public override Point GetPositionFromChar(int charIndex)
=> _owningTextBoxBase.IsHandleCreated
? _owningTextBoxBase.GetPositionFromCharIndex(charIndex)
: Point.Empty;
private static Point GetPositionFromCharIndex(TextBoxBase textBox, int offset)
{
Point position = textBox.GetPositionFromCharIndex(offset);
// the following is necessary to work around a .Net bug
int x = (Int16) position.X;
int y = (Int16) position.Y;
return new Point(x, y);
}
