internal static float WidthFit(ICharSequence text, TextPaint paint, int lines, float min, float max, int availWidth, int availHeight)
{
if (availWidth > int.MaxValue / 3)
{
if (availHeight > int.MaxValue / 3)
{
return(max);
}
var fontMetrics = paint.GetFontMetrics();
var fontLineHeight = fontMetrics.Descent * FontScale - fontMetrics.Ascent * FontScale;
var fontLeading = System.Math.Abs(fontMetrics.Bottom * FontScale - fontMetrics.Descent * FontScale);
var fontPixelSize = paint.TextSize * FontScale;
var lineHeightRatio = fontLineHeight / fontPixelSize;
var leadingRatio = fontLeading / fontPixelSize;
float ans = ((availHeight / (lines + leadingRatio * (lines - 1))) / lineHeightRatio - 0.1f);
return(System.Math.Min(ans, max));
}
var result = ZeroLinesFit(text, paint, min, max, availWidth, availHeight);
float step = (result - min) / 5;
if (step > 0.05f)
{
result = DescendingWidthFit(text, paint, lines, min, result, availWidth, availHeight, step);
while (step > 0.25f)
{
step /= 5;
result = DescendingWidthFit(text, paint, lines, result, result + step * 5, availWidth, availHeight, step);
}
}
return(result);
}
internal static float ZeroLinesFit(ICharSequence text, TextPaint paint, float min, float max, int availWidth, int availHeight)
{
if (availHeight > int.MaxValue / 3)
{
return(max);
}
if (availWidth > int.MaxValue / 3)
{
var fontMetrics = paint.GetFontMetrics();
var fontLineHeight = fontMetrics.Descent - fontMetrics.Ascent;
//var fontLeading = System.Math.Abs(fontMetrics.Bottom - fontMetrics.Descent);
var fontPixelSize = paint.TextSize;
var lineHeightRatio = fontLineHeight / fontPixelSize;
//var leadingRatio = fontLeading / fontPixelSize;
var result = (availHeight / lineHeightRatio - 0.1f);
return(System.Math.Min(result, max));
}
if (max - min < Precision)
{
return(min);
}
float mid = (max + min) / 2.0f;
paint.TextSize = mid * Scale;
var layout = new StaticLayout(text, paint, availWidth, Android.Text.Layout.Alignment.AlignNormal, 1.0f, 0.0f, true);
var lineCount = layout.LineCount;
var height = layout.Height - layout.BottomPadding + layout.TopPadding;
if (height > availHeight)
{
return(ZeroLinesFit(text, paint, min, mid, availWidth, availHeight));
}
if (height < availHeight)
{
return(ZeroLinesFit(text, paint, mid, max, availWidth, availHeight));
}
float maxLineWidth = 0;
for (int i = 0; i < lineCount; i++)
{
if (layout.GetLineWidth(i) > maxLineWidth)
{
maxLineWidth = layout.GetLineWidth(i);
}
}
if (maxLineWidth > availWidth)
{
return(ZeroLinesFit(text, paint, min, mid, availWidth, availHeight));
}
if (maxLineWidth < availWidth)
{
return(ZeroLinesFit(text, paint, mid, max, availWidth, availHeight));
}
return(mid);
}
internal static float ZeroLinesFit(ICharSequence text, TextPaint paint, float min, float max, int availWidth, int availHeight, float lineHeightMultiplier)
{
if (availHeight >= 238609294)
{
return(max);
}
if (availWidth >= 238609294)
{
var fontMetrics = paint.GetFontMetrics();
var fontLineHeight = fontMetrics.Descent * FontScale - fontMetrics.Ascent * FontScale;
var fontPixelSize = paint.TextSize * FontScale;
var lineHeightRatio = fontLineHeight / fontPixelSize;
var result = (availHeight / lineHeightRatio - 0.1f);
return(System.Math.Min(result, max));
}
if (max - min < Precision)
{
return(min);
}
float mid = (max + min) / 2.0f;
paint.TextSize = mid * Scale;
using (var layout = TextExtensions.StaticLayout(text, paint, availWidth, Android.Text.Layout.Alignment.AlignNormal, lineHeightMultiplier, 0.0f, true))
{
var lineCount = layout.LineCount;
var height = layout.Height - layout.BottomPadding + layout.TopPadding;
if (height > availHeight)
{
return(ZeroLinesFit(text, paint, min, mid, availWidth, availHeight, lineHeightMultiplier));
}
if (height < availHeight)
{
return(ZeroLinesFit(text, paint, mid, max, availWidth, availHeight, lineHeightMultiplier));
}
float maxLineWidth = 0;
for (int i = 0; i < lineCount; i++)
{
if (layout.GetLineWidth(i) > maxLineWidth)
{
maxLineWidth = layout.GetLineWidth(i);
}
}
if (maxLineWidth > availWidth)
{
return(ZeroLinesFit(text, paint, min, mid, availWidth, availHeight, lineHeightMultiplier));
}
if (maxLineWidth < availWidth)
{
return(ZeroLinesFit(text, paint, mid, max, availWidth, availHeight, lineHeightMultiplier));
}
return(mid);
}
}
/// <summary>Define paints.</summary>
private void InitPaint()
{
// Round rectangle paint
_strokePaint = new Paint
{
Color = _selectedColor.ToColor(),
AntiAlias = true,
StrokeWidth = _strokeWidth
};
_strokePaint.SetStyle(Paint.Style.Stroke);
// Selected paint
_fillPaint = new Paint
{
Color = _selectedColor.ToColor()
};
_strokePaint.AntiAlias = true;
_fillPaint.SetStyle(Paint.Style.FillAndStroke);
// Selected text paint
_selectedTextPaint = new TextPaint(PaintFlags.AntiAlias)
{
TextSize = _textSize,
Color = unchecked ((int)0xffffffff).ToColor()
};
_strokePaint.AntiAlias = true;
// Unselected text paint
_unselectedTextPaint = new TextPaint(PaintFlags.AntiAlias)
{
TextSize = _textSize,
Color = _selectedColor.ToColor()
};
_strokePaint.AntiAlias = true;
_textHeightOffset = -(_selectedTextPaint.Ascent() + _selectedTextPaint.Descent()) * 0.5f;
_fontMetrics = _selectedTextPaint.GetFontMetrics();
}
internal static float WidthFit(ICharSequence text, TextPaint paint, int lines, float min, float max, int availWidth, int availHeight)
{
//System.Diagnostics.Debug.WriteLine("F9PTextView.WidthFit: availWidth=["+availWidth+"] availHeight=["+availHeight+"]");
if (availWidth > int.MaxValue / 3)
{
if (availHeight > int.MaxValue / 3)
{
return(max);
}
var fontMetrics = paint.GetFontMetrics();
var fontLineHeight = fontMetrics.Descent - fontMetrics.Ascent;
var fontLeading = System.Math.Abs(fontMetrics.Bottom - fontMetrics.Descent);
var fontPixelSize = paint.TextSize;
var lineHeightRatio = fontLineHeight / fontPixelSize;
var leadingRatio = fontLeading / fontPixelSize;
float ans = ((availHeight / (lines + leadingRatio * (lines - 1))) / lineHeightRatio - 0.1f);
if (ans > max)
{
ans = max;
}
return(ans);
}
var result = ZeroLinesFit(text, paint, min, max, availWidth, availHeight);
float step = (result - min) / 5;
if (step > 0.05f)
{
result = DescendingWidthFit(text, paint, lines, min, result, availWidth, availHeight, step);
while (step > 0.25f)
{
step /= 5;
result = DescendingWidthFit(text, paint, lines, result, result + step * 5, availWidth, availHeight, step);
}
}
return(result);
}
public override void Draw(Canvas canvas)
{
base.Draw(canvas);
TextPaint paint = new TextPaint();
paint.AntiAlias = true;
paint.SetTypeface(Control.Typeface);
paint.TextSize = myFontSize * scaledDensity;
paint.Color = Android.Graphics.Color.Red;
Paint.FontMetrics metrics = paint.GetFontMetrics();
Rect bounds = new Rect();
paint.GetTextBounds(Element.Text, 0, Element.Text.Length, bounds);
canvas.DrawText(
Element.Text,
0.5f * MeasuredWidth - bounds.Left - 0.5f * bounds.Width(),
0.5f * MeasuredHeight - metrics.Ascent - 0.5f * (metrics.Bottom - metrics.Top),
paint
);
}
//bool _truncating;
internal static StaticLayout Truncate(string text, F9PFormattedString baseFormattedString, TextPaint paint, int availWidth, int availHeight, AutoFit fit, LineBreakMode lineBreakMode, ref int lines, ref ICharSequence textFormatted)
{
StaticLayout layout = null;
var fontMetrics = paint.GetFontMetrics();
var fontLineHeight = fontMetrics.Descent - fontMetrics.Ascent;
var fontLeading = System.Math.Abs(fontMetrics.Bottom - fontMetrics.Descent);
textFormatted = ((ICharSequence)baseFormattedString?.ToSpannableString()) ?? new Java.Lang.String(text);
if (lines > 0)
{
if (baseFormattedString != null)
{
layout = new StaticLayout(textFormatted, paint, availWidth, Android.Text.Layout.Alignment.AlignNormal, 1.0f, 0.0f, true);
if (layout.Height > availHeight)
{
var visibleLines = (int)((fontLeading + availHeight) / (fontLineHeight + fontLeading));
if (visibleLines < lines)
{
lines = visibleLines;
}
}
if (layout.LineCount > lines && lines > 0)
{
var secondToLastEnd = lines > 1 ? layout.GetLineEnd(lines - 2) : 0;
var start = lines > 1 ? layout.GetLineStart(layout.LineCount - 2) : 0;
switch (lineBreakMode)
{
case LineBreakMode.HeadTruncation:
textFormatted = StartTruncatedFormatted(baseFormattedString, paint, secondToLastEnd, start, layout.GetLineEnd(layout.LineCount - 1), availWidth);
break;
case LineBreakMode.MiddleTruncation:
textFormatted = MidTruncatedFormatted(baseFormattedString, paint, secondToLastEnd, layout.GetLineStart(lines - 1), (layout.GetLineEnd(lines - 1) + layout.GetLineStart(lines - 1)) / 2 - 1, start, layout.GetLineEnd(layout.LineCount - 1), availWidth);
break;
case LineBreakMode.TailTruncation:
textFormatted = EndTruncatedFormatted(baseFormattedString, paint, secondToLastEnd, layout.GetLineStart(lines - 1), layout.GetLineEnd(layout.LineCount - 1), availWidth);
break;
default:
//textFormatted = baseFormattedString.ToSpannableString(EllipsePlacement.None, 0, 0, layout.GetLineEnd(lines - 1));
textFormatted = TruncatedFormatted(baseFormattedString, paint, secondToLastEnd, layout.GetLineStart(lines - 1), layout.GetLineEnd(layout.LineCount - 1), availWidth);
break;
}
}
}
else
{
layout = new StaticLayout(text, paint, availWidth, Android.Text.Layout.Alignment.AlignNormal, 1.0f, 0.0f, true);
if (layout.Height > availHeight)
{
var visibleLines = (int)((fontLeading + availHeight) / (fontLineHeight + fontLeading));
if (visibleLines < lines)
{
lines = visibleLines;
}
}
if (layout.LineCount > lines && lines > 0)
{
var secondToLastEnd = lines > 1 ? layout.GetLineEnd(lines - 2) : 0;
var start = lines > 1 ? layout.GetLineStart(layout.LineCount - 2) : 0;
switch (lineBreakMode)
{
case LineBreakMode.HeadTruncation:
text = StartTruncatedLastLine(text, paint, secondToLastEnd, start, layout.GetLineEnd(layout.LineCount - 1), availWidth);
break;
case LineBreakMode.MiddleTruncation:
text = MidTruncatedLastLine(text, paint, secondToLastEnd, layout.GetLineStart(lines - 1), (layout.GetLineEnd(lines - 1) + layout.GetLineStart(lines - 1)) / 2 - 1, start, layout.GetLineEnd(layout.LineCount - 1), availWidth);
break;
case LineBreakMode.TailTruncation:
text = EndTruncatedLastLine(text, paint, secondToLastEnd, layout.GetLineStart(lines - 1), layout.GetLineEnd(layout.LineCount - 1), availWidth);
break;
default:
text = text.Substring(0, layout.GetLineEnd(lines - 1));
break;
}
textFormatted = new Java.Lang.String(text);
}
}
}
return(new StaticLayout(textFormatted, paint, availWidth, Android.Text.Layout.Alignment.AlignNormal, 1.0f, 0.0f, true));
}
#pragma warning disable IDE0060 // Remove unused parameter
internal static StaticLayout Truncate(string text, Forms9Patch.F9PFormattedString baseFormattedString, TextPaint paint, int availWidth, int availHeight, AutoFit fit, LineBreakMode lineBreakMode, float lineHeightMultiplier, ref int lines, ref ICharSequence textFormatted)
#pragma warning restore IDE0060 // Remove unused parameter
{
StaticLayout layout = null;
var fontMetrics = paint.GetFontMetrics();
var fontLineHeight = fontMetrics.Descent - fontMetrics.Ascent;
var fontLeading = System.Math.Abs(fontMetrics.Bottom - fontMetrics.Descent);
textFormatted = ((ICharSequence)baseFormattedString?.ToSpannableString()) ?? new Java.Lang.String(text);
if (lines > 0)
{
if (baseFormattedString != null)
{
layout = TextExtensions.StaticLayout(textFormatted, paint, availWidth, Android.Text.Layout.Alignment.AlignNormal, lineHeightMultiplier, 0.0f, true);
if (layout.Height > availHeight)
{
var visibleLines = (int)((fontLeading + availHeight) / (fontLineHeight + fontLeading));
if (visibleLines < lines)
{
lines = visibleLines;
}
}
if (layout.LineCount > lines && lines > 0)
{
var secondToLastEnd = lines > 1 ? layout.GetLineEnd(lines - 2) : 0;
var start = lines > 1 ? layout.GetLineStart(layout.LineCount - 2) : 0;
textFormatted?.Dispose();
switch (lineBreakMode)
{
case LineBreakMode.HeadTruncation:
textFormatted = StartTruncatedFormatted(baseFormattedString, paint, secondToLastEnd, start, layout.GetLineEnd(layout.LineCount - 1), availWidth, lineHeightMultiplier);
break;
case LineBreakMode.MiddleTruncation:
textFormatted = MidTruncatedFormatted(baseFormattedString, paint, secondToLastEnd, layout.GetLineStart(lines - 1), (layout.GetLineEnd(lines - 1) + layout.GetLineStart(lines - 1)) / 2 - 1, start, layout.GetLineEnd(layout.LineCount - 1), availWidth, lineHeightMultiplier);
break;
case LineBreakMode.TailTruncation:
textFormatted = EndTruncatedFormatted(baseFormattedString, paint, secondToLastEnd, layout.GetLineStart(lines - 1), layout.GetLineEnd(layout.LineCount - 1), availWidth, lineHeightMultiplier);
break;
default:
textFormatted = TruncatedFormatted(baseFormattedString, paint, secondToLastEnd, layout.GetLineStart(lines - 1), layout.GetLineEnd(layout.LineCount - 1), availWidth, lineHeightMultiplier);
break;
}
}
}
else
{
layout = TextExtensions.StaticLayout(text, paint, availWidth, Android.Text.Layout.Alignment.AlignNormal, lineHeightMultiplier, 0.0f, true);
if (layout.Height > availHeight)
{
var visibleLines = (int)((fontLeading + availHeight) / (fontLineHeight + fontLeading));
if (visibleLines < lines)
{
lines = visibleLines;
}
}
if (layout.LineCount > lines && lines > 0)
{
var secondToLastEnd = lines > 1 ? layout.GetLineEnd(lines - 2) : 0;
var start = lines > 1 ? layout.GetLineStart(layout.LineCount - 2) : 0;
switch (lineBreakMode)
{
case LineBreakMode.HeadTruncation:
text = StartTruncatedLastLine(text, paint, secondToLastEnd, start, layout.GetLineEnd(layout.LineCount - 1), availWidth, lineHeightMultiplier);
break;
case LineBreakMode.MiddleTruncation:
text = MidTruncatedLastLine(text, paint, secondToLastEnd, layout.GetLineStart(lines - 1), (layout.GetLineEnd(lines - 1) + layout.GetLineStart(lines - 1)) / 2 - 1, start, layout.GetLineEnd(layout.LineCount - 1), availWidth, lineHeightMultiplier);
break;
case LineBreakMode.TailTruncation:
text = EndTruncatedLastLine(text, paint, secondToLastEnd, layout.GetLineStart(lines - 1), layout.GetLineEnd(layout.LineCount - 1), availWidth, lineHeightMultiplier);
break;
default:
text = text.Substring(0, layout.GetLineEnd(lines - 1));
break;
}
textFormatted?.Dispose();
textFormatted = new Java.Lang.String(text);
}
}
}
var result = TextExtensions.StaticLayout(textFormatted, paint, availWidth, Android.Text.Layout.Alignment.AlignNormal, lineHeightMultiplier, 0.0f, true);
layout?.Dispose();
//textFormatted?.Dispose(); // this causes Bc3.Keypad to break!
return(result);
}
