void paintBackground(Canvas canvas, PaintRecord record, Offset baseOffset)
{
if (record.style.background == null)
{
return;
}
var metrics = record.metrics;
Rect rect = Rect.fromLTRB(0, metrics.ascent, record.runWidth, metrics.descent);
rect = rect.shift(record.shiftedOffset(baseOffset));
canvas.drawRect(rect, record.style.background);
}
void paintDecorations(Canvas canvas, PaintRecord record, Offset baseOffset)
{
if (record.style.decoration == null || record.style.decoration == TextDecoration.none)
{
return;
}
if (record.style.decorationColor == null)
{
this._textPaint.color = record.style.color;
}
else
{
this._textPaint.color = record.style.decorationColor;
}
var width = record.runWidth;
var metrics = record.metrics;
float underLineThickness = metrics.underlineThickness ?? (record.style.fontSize / 14.0f);
this._textPaint.style = PaintingStyle.stroke;
this._textPaint.strokeWidth = underLineThickness;
var recordOffset = record.shiftedOffset(baseOffset);
var x = recordOffset.dx;
var y = recordOffset.dy;
int decorationCount = 1;
switch (record.style.decorationStyle)
{
case TextDecorationStyle.doubleLine:
decorationCount = 2;
break;
}
var decoration = record.style.decoration;
for (int i = 0; i < decorationCount; i++)
{
float yOffset = i * underLineThickness * kFloatDecorationSpacing;
float yOffsetOriginal = yOffset;
if (decoration != null && decoration.contains(TextDecoration.underline))
{
// underline
yOffset += metrics.underlinePosition ?? underLineThickness;
canvas.drawLine(new Offset(x, y + yOffset), new Offset(x + width, y + yOffset), this._textPaint);
yOffset = yOffsetOriginal;
}
if (decoration != null && decoration.contains(TextDecoration.overline))
{
yOffset += metrics.ascent;
canvas.drawLine(new Offset(x, y + yOffset), new Offset(x + width, y + yOffset), this._textPaint);
yOffset = yOffsetOriginal;
}
if (decoration != null && decoration.contains(TextDecoration.lineThrough))
{
yOffset += (decorationCount - 1.0f) * underLineThickness * kFloatDecorationSpacing / -2.0f;
yOffset += metrics.strikeoutPosition ?? (metrics.fxHeight ?? 0) / -2.0f;
canvas.drawLine(new Offset(x, y + yOffset), new Offset(x + width, y + yOffset), this._textPaint);
yOffset = yOffsetOriginal;
}
}
this._textPaint.style = PaintingStyle.fill;
this._textPaint.strokeWidth = 0;
}
