1 files changed, 31 insertions, 0 deletions
diff --git a/bar_filler.go b/bar_filler.go
new file mode 100644
index 0000000..379cfea
--- /dev/null
+++ b/bar_filler.go
@@ -0,0 +1,31 @@
+package mpb
+
+import (
+	"io"
+
+	"github.com/vbauerster/mpb/v8/decor"
+)
+
+// BarFiller interface.
+// Bar (without decorators) renders itself by calling BarFiller's Fill method.
+type BarFiller interface {
+	Fill(io.Writer, decor.Statistics) error
+}
+
+// BarFillerBuilder interface.
+// Default implementations are:
+//
+//	BarStyle()
+//	SpinnerStyle()
+//	NopStyle()
+type BarFillerBuilder interface {
+	Build() BarFiller
+}
+
+// BarFillerFunc is function type adapter to convert compatible function
+// into BarFiller interface.
+type BarFillerFunc func(io.Writer, decor.Statistics) error
+
+func (f BarFillerFunc) Fill(w io.Writer, stat decor.Statistics) error {
+	return f(w, stat)
+}