func (e *Entry) draw(gc draw2d.GraphicContext) { if e.textOffset+e.runeOffsets[e.cursor] < 5 { e.textOffset = 5 - e.runeOffsets[e.cursor] } if e.textOffset+e.runeOffsets[e.cursor] > e.Size.X-5 { e.textOffset = e.Size.X - 5 - e.runeOffsets[e.cursor] } gc.Clear() if e.HasKeyFocus { gc.SetFillColor(color.RGBA{150, 150, 150, 255}) safeRect(gc, geom.Coord{0, 0}, e.Size) gc.Fill() } th := float64(e.textBuffer.Bounds().Max.Y - e.textBuffer.Bounds().Min.Y) gc.Save() gc.Translate(e.textOffset, 0) if e.selecting { start := e.runeOffsets[e.cursor] end := e.runeOffsets[e.selectCursor] if start > end { start, end = end, start } gc.SetFillColor(color.RGBA{200, 200, 200, 255}) safeRect(gc, geom.Coord{start, 0}, geom.Coord{end, e.Size.Y}) gc.Fill() } gc.Translate(0, (e.Size.Y-th)/2) gc.DrawImage(e.textBuffer) gc.Restore() if e.HasKeyFocus { un := time.Duration(time.Now().UnixNano()) ms := un / time.Millisecond ms = ms % 750 var intensity uint8 = 255 if ms > 550 { diff := 650 - ms if diff < 0 { diff *= -1 } intensity = uint8((diff * 255) / 200) } offset := float64(int(e.runeOffsets[e.cursor] + e.textOffset)) gc.SetStrokeColor(color.RGBA{A: intensity}) gc.MoveTo(offset, 0) gc.LineTo(offset, e.Size.Y) gc.Stroke() e.Invalidate(geom.Rect{ Min: geom.Coord{offset - 1, 0}, Max: geom.Coord{offset + 1, e.Size.Y}, }) } }