internal static float MeasureFullHeight(TextBox textBox, Graphics g, FontCache fontCache, FlowContext flowContext, out float contentHeight)
{
if (flowContext.Width <= 0f)
{
contentHeight = 0f;
return(0f);
}
FlowContext flowContext2 = flowContext.Clone();
flowContext2.Reset();
flowContext2.Height = float.MaxValue;
float num = 0f;
if (textBox.VerticalText)
{
flowContext2.LineLimit = false;
float width = 0f;
float nextWidth = 0f;
float num2 = 0f;
float num3 = flowContext.Height;
float num4 = 0f;
if (flowContext.Height == float.MaxValue)
{
num3 = 0f;
}
num2 = (contentHeight = LineBreaker.FlowVertical(textBox, g, fontCache, flowContext2, out width, out nextWidth));
num = width;
num4 = width;
bool flag = flowContext2.CharTrimmedRunWidth > 0;
float num5 = 0f;
while (num2 < flowContext.Width && width > num3)
{
flowContext2.Reset();
flowContext2.Height = Math.Max(nextWidth, num3);
flowContext2.Width = float.MaxValue;
num2 = LineBreaker.FlowVertical(textBox, g, fontCache, flowContext2, out width, out nextWidth);
if (num2 < flowContext.Width)
{
num5 = num2 - contentHeight;
if (num2 <= contentHeight || num5 <= 0.1f)
{
if (flag)
{
contentHeight = num2;
num = flowContext2.Height;
break;
}
if (flowContext2.CharTrimmedRunWidth <= 0)
{
break;
}
}
contentHeight = num2;
num = flowContext2.Height;
num4 = width;
}
else
{
num5 = num - flowContext2.Height;
if (!(num5 > 0.1f))
{
break;
}
nextWidth = flowContext2.Height + (num - flowContext2.Height) / 2f;
contentHeight = num2;
width = num4;
}
flag = (flowContext2.CharTrimmedRunWidth > 0);
}
}
else
{
LineBreaker.Flow(textBox, g, fontCache, flowContext2, keepLines: false, out contentHeight);
num = contentHeight;
}
return(num);
}