public static Vector2 ComputePreferredSize(FormattedText text)
{
bool empty = text.IsEmpty;
if (empty)
{
text.ApplySource(" ");
}
var wrap = text.WordWrap;
var alignment = text.LineAlign;
var width = text.MaxWidth;
var height = text.MaxHeight;
text.WordWrap = FormattedText.WrapMode.Element;
text.LineAlign = Alignment.Left;
text.MaxWidth = 0;
text.MaxHeight = 0;
var size = text.Size;
text.WordWrap = wrap;
text.LineAlign = alignment;
text.MaxWidth = width;
text.MaxHeight = height;
if (empty)
{
text.ApplySource("");
}
return(size);
}
public static Vector2 ComputePreferredSize(FormattedText text, Vector2 maxSize)
{
bool empty = text.IsEmpty;
if (empty)
{
text.ApplySource(" ");
}
// This is far from perfect, I don't understand the precise behaviour of FormattedText.MaxWidth/Height
// It seems inconsistent.
if (maxSize.X == 0 && maxSize.Y == 0)
{
// Handle this specific case here, since 0 is a magic "no constraint" value for formatted text width and height.
// This shouldn't make any real difference, since the final size will be clamped in UIComponent.cs somehwere.
return(Vector2.Zero);
}
maxSize.X = MathF.Clamp(maxSize.X, 0, BlueConfig.MaxTextAreaSize.X);
maxSize.Y = MathF.Clamp(maxSize.Y, 0, BlueConfig.MaxTextAreaSize.Y);
var width = text.MaxWidth;
var height = text.MaxHeight;
text.MaxWidth = (int)maxSize.X;
text.MaxHeight = (int)maxSize.Y;
var size = text.Size;
text.MaxWidth = width;
text.MaxHeight = height;
if (empty)
{
text.ApplySource("");
}
return(size);
}
public override void Perform(Font font, PreviewImageQuery query)
{
int desiredWidth = query.DesiredWidth;
int desiredHeight = query.DesiredHeight;
const string text = "/acThe quick brown fox jumps over the lazy dog.";
FormattedText formatText = new FormattedText();
formatText.MaxWidth = Math.Max(1, desiredWidth - 10);
formatText.MaxHeight = Math.Max(1, desiredHeight - 10);
formatText.WordWrap = FormattedText.WrapMode.Word;
formatText.Fonts = new[] { new ContentRef <Font>(font) };
formatText.ApplySource(text);
PixelData textLayer = new PixelData(desiredWidth, MathF.RoundToInt(formatText.Size.Y));
formatText.RenderToBitmap(text, textLayer, 5, 0);
Bitmap resultBitmap = textLayer.ToBitmap();
// Debug Font metrics
//const bool drawDebugFontMetrics = true;
//if (drawDebugFontMetrics)
//{
// var metrics = formatText.TextMetrics;
// Color fgColor = Color.White;
// Color baseLineColor = Color.FromArgb(255, 0, 0);
// Color bodyAscentColor = Color.FromArgb(0, 192, 0);
// Color ascentColor = Color.FromArgb(64, 64, 255);
// Color descentColor = Color.FromArgb(255, 0, 255);
// using (Graphics g = Graphics.FromImage(resultBitmap))
// {
// for (int i = 0; i < metrics.LineCount; i++)
// {
// Rect lineBounds = metrics.LineBounds[i];
// g.DrawRectangle(new Pen(Color.FromArgb(128, fgColor)), lineBounds.X + 5, lineBounds.Y, lineBounds.W, lineBounds.H - 1);
// g.DrawLine(new Pen(Color.FromArgb(192, baseLineColor)), 0, lineBounds.Y + font.BaseLine, resultBitmap.Width, lineBounds.Y + font.BaseLine);
// g.DrawLine(new Pen(Color.FromArgb(192, bodyAscentColor)), 0, lineBounds.Y + font.BaseLine - font.BodyAscent, resultBitmap.Width, lineBounds.Y + font.BaseLine - font.BodyAscent);
// g.DrawLine(new Pen(Color.FromArgb(192, ascentColor)), 0, lineBounds.Y + font.BaseLine - font.Ascent, resultBitmap.Width, lineBounds.Y + font.BaseLine - font.Ascent);
// g.DrawLine(new Pen(Color.FromArgb(192, descentColor)), 0, lineBounds.Y + font.BaseLine + font.Descent, resultBitmap.Width, lineBounds.Y + font.BaseLine + font.Descent);
// }
// }
//}
query.Result = resultBitmap.Resize(desiredWidth, desiredHeight, Alignment.Left);
}
