Add TextGridTextStyle

enable the text style to be passed in as part of the TextGridStyle.
this will allow font options to be passed down

widget/textgrid.go

@@ -47,9 +47,15 @@ type TextGridStyle interface {
  BackgroundColor() color.Color
 }
 
+// TextGridTextStyle defines the text style that can be applied to a TextGrid cell.
+type TextGridTextStyle interface {
+ TextStyle() *fyne.TextStyle
+}
+
 // CustomTextGridStyle is a utility type for those not wanting to define their own style types.
 type CustomTextGridStyle struct {
  FGColor, BGColor color.Color
+ Text *fyne.TextStyle
 }
 
 // TextColor is the color a cell should use for the text.
@@ -62,6 +68,11 @@ func (c *CustomTextGridStyle) BackgroundColor() color.Color {
  return c.BGColor
 }
 
+// TextStyle is the color a cell should use for the background.
+func (c *CustomTextGridStyle) TextStyle() *fyne.TextStyle {
+ return c.Text
+}
+
 // TextGrid is a monospaced grid of characters.
 // This is designed to be used by a text editor, code preview or terminal emulator.
 type TextGrid struct {
@@ -365,14 +376,27 @@ func (t *textGridRenderer) setCellRune(str rune, pos int, style, rowStyle TextGr
 
  text := t.objects[pos*2+1].(*canvas.Text)
  text.TextSize = theme.TextSize()
+ textStyle := text.TextStyle
+
  fg := theme.ForegroundColor()
  if style != nil && style.TextColor() != nil {
  fg = style.TextColor()
  } else if rowStyle != nil && rowStyle.TextColor() != nil {
  fg = rowStyle.TextColor()
  }
+
+ if ts, ok := style.(TextGridTextStyle); style != nil && ok {
+ if stylePtr := ts.TextStyle(); stylePtr != nil {
+ textStyle = *stylePtr
+ }
+ } else if ts, ok := rowStyle.(TextGridTextStyle); rowStyle != nil && ok {
+ if stylePtr := ts.TextStyle(); stylePtr != nil {
+ textStyle = *stylePtr
+ }
+ }
+
  newStr := string(str)
- if text.Text != newStr || text.Color != fg {
+ if text.Text != newStr || text.Color != fg || textStyle != text.TextStyle {
  text.Text = newStr
  text.Color = fg
  t.refresh(text)