public virtual RectangleF GetRectangleFromCharacterIndex(int index, bool trailEdge)
{
string text = this.GetText();
if (index < 0 || index > text.Length)
{
throw new ArgumentOutOfRangeException(nameof(index));
}
Size size = Size.Empty;
Font scaledFont = this.GetScaledFont(this.DpiScaleFactor.Height);
if (index == 0 && !trailEdge)
{
size.Height = (int)this.DesiredSize.Height;
}
else if (index == this.text.Length && trailEdge)
{
size = this.DesiredSize.ToSize();
}
else
{
if (trailEdge)
{
++index;
}
size = TextBoxControlMeasurer.MeasureText(text.Substring(0, index), scaledFont);
}
RectangleF rectangleF = new RectangleF((PointF)this.ControlBoundingRectangle.Location, new SizeF(0.0f, (float)size.Height));
rectangleF.X += (float)size.Width;
return(rectangleF);
}
protected virtual bool SplitBlock(
LineInfo currentLine,
SizeF availableSize,
ref ITextBlock textBlock,
ref int offset)
{
string text1 = textBlock.Text;
int num = TextBoxControlMeasurer.BinarySearchWrapIndex(text1, this.Font, availableSize.Width);
switch (num)
{
case -1:
case 0:
return(false);
default:
if (num != text1.Length)
{
string str = text1.Substring(0, num);
string text2 = text1.Substring(num);
textBlock.Text = str;
textBlock.Offset = offset;
offset += textBlock.Length;
int index1 = textBlock.Index;
this.MeasureTextBlock(textBlock, availableSize);
currentLine.EndBlock = textBlock;
this.AddBlockDesiredSize(textBlock.DesiredSize, currentLine);
int index2 = index1 + 1;
textBlock = this.CreateBlock(text2, TextBoxWrapPanel.TextBlockElementType);
this.Children.Insert(index2, textBlock as RadElement);
return(true);
}
goto case -1;
}
}
public static int BinarySearchCaretIndex(string text, Font font, double availableWidth)
{
if (text.Length == 0)
{
return(0);
}
int index = -1;
int num1 = 0;
int num2 = text.Length - 1;
int num3 = 0;
while (num1 <= num2)
{
index = num1 + (num2 - num1 >> 1);
num3 = TextBoxControlMeasurer.MeasureText(text.Substring(0, index + 1), font).Width;
if ((double)num3 <= availableWidth)
{
num1 = index + 1;
}
else
{
num2 = index - 1;
}
}
if (index + 1 < text.Length)
{
++index;
}
else
{
num3 = TextBoxControlMeasurer.MeasureText(text.Substring(0, index), font).Width;
}
if ((double)num3 != availableWidth)
{
int num4 = TextBoxControlMeasurer.MeasureText(text[index].ToString(), font).Width / 2;
if ((double)num3 < availableWidth)
{
if ((double)(num3 + num4) <= availableWidth)
{
++index;
}
}
else if ((double)(num3 - num4) > availableWidth)
{
--index;
}
}
return(Math.Max(index, 0));
}
public virtual int GetCharacterIndexFromX(float x)
{
int num = 0;
int x1 = this.ControlBoundingRectangle.X;
if ((double)x >= (double)this.ControlBoundingRectangle.Right)
{
num = this.Length;
}
else if ((double)x > (double)x1)
{
num = TextBoxControlMeasurer.BinarySearchCaretIndex(this.GetText(), this.GetScaledFont(this.DpiScaleFactor.Height), (double)(x - (float)x1));
}
return(num);
}
public static int BinarySearchWrapIndex(string text, Font font, float availableWidth)
{
if (text.Length == 0)
{
return(0);
}
int length = -1;
int num1 = 0;
int num2 = text.Length - 1;
string empty = string.Empty;
float num3 = float.MaxValue;
int num4 = 0;
while (num1 <= num2)
{
length = (num2 + num1) / 2;
int width = TextBoxControlMeasurer.MeasureText(text.Substring(0, length), font).Width;
if ((double)num3 < (double)availableWidth && (double)width > (double)availableWidth)
{
length = num4;
break;
}
if ((double)width != (double)availableWidth)
{
if ((double)width < (double)availableWidth)
{
num1 = length + 1;
}
else
{
num2 = length - 1;
}
num4 = length;
num3 = (float)width;
}
else
{
break;
}
}
while (length < text.Length && (double)TextBoxControlMeasurer.MeasureText(text.Substring(0, length + 1), font).Width <= (double)availableWidth)
{
++length;
}
return(length);
}
protected override SizeF MeasureOverride(SizeF availableSize)
{
if (!this.performMeasure)
{
return(this.DesiredSize);
}
this.performMeasure = false;
string text = this.GetText();
bool flag = string.IsNullOrEmpty(text);
if (flag)
{
text = "X";
}
SizeF sizeF = (SizeF)TextBoxControlMeasurer.MeasureText(text, this.GetScaledFont(this.DpiScaleFactor.Height));
if (flag)
{
sizeF.Width = 0.0f;
}
return(sizeF);
}
protected override void PaintElement(IGraphics graphics, float angle, SizeF scale)
{
if (this.drawFill)
{
base.PaintElement(graphics, angle, scale);
}
if (this.text == null || this.text.Trim() == string.Empty)
{
return;
}
Graphics underlayGraphics = graphics.UnderlayGraphics as Graphics;
TextRenderingHint textRenderingHint = underlayGraphics.TextRenderingHint;
underlayGraphics.TextRenderingHint = TextRenderingHint.SystemDefault;
Point location = this.ControlBoundingRectangle.Location;
--location.Y;
List <string> textParts = this.GetTextParts();
int count = textParts.Count;
Color foreColor = this.ForeColor;
Color backColor = this.Enabled ? Color.Transparent : this.BackColor;
using (RadHdcWrapper radHdcWrapper = new RadHdcWrapper(underlayGraphics, false))
{
for (int index = 0; index < count; ++index)
{
string text = textParts[index];
TextRenderer.DrawText((IDeviceContext)radHdcWrapper, text, this.GetScaledFont(this.DpiScaleFactor.Height), location, foreColor, backColor, TextFormatFlags.NoClipping | TextFormatFlags.NoPrefix | TextFormatFlags.SingleLine | TextFormatFlags.PreserveGraphicsClipping | TextFormatFlags.PreserveGraphicsTranslateTransform | TextFormatFlags.NoPadding);
if (index < count - 1)
{
Size size = TextBoxControlMeasurer.MeasureText(text, this.GetScaledFont(this.DpiScaleFactor.Height));
location.X += size.Width;
}
}
}
underlayGraphics.TextRenderingHint = textRenderingHint;
}
