nicer way for meter style

1 files changed, 31 insertions, 19 deletions

diff --git a/src/rhlibrary/vumeter_widget.go b/src/rhlibrary/vumeter_widget.go
index 323e826..35586fa 100644
--- a/src/rhlibrary/vumeter_widget.go
+++ b/src/rhlibrary/vumeter_widget.go
@@ -41,13 +41,17 @@ const (
 )
 
 var (
-	meterBarCSS *gtk.CssProvider
+	meterBarCSS *gtk.CssProvider = nil
 )
 
-func init() {
+func getMeterBarCSS() (*gtk.CssProvider, error) {
+	if meterBarCSS != nil {
+		return meterBarCSS, nil
+	}
+
 	var err error
 	if meterBarCSS, err = gtk.CssProviderNew(); err != nil {
-		panic(err.Error())
+		return nil, err
 	}
 	err = meterBarCSS.LoadFromData(`
 .level-bar {
@@ -73,8 +77,9 @@ func init() {
   background-image: linear-gradient(to bottom, #FF3636, #AE0000);
 }`)
 	if err != nil {
-		panic(err.Error())
+		return nil, err
 	}
+	return meterBarCSS, nil
 }
 
 type vuMeterLevel struct {
@@ -121,7 +126,12 @@ func createMeterBar(segments float64) (bar *gtk.LevelBar, err error) {
 	if sc, err = bar.GetStyleContext(); err != nil {
 		return
 	}
-	sc.AddProvider(meterBarCSS, 600) // TOOD: hardcoded value
+
+	var cp *gtk.CssProvider
+	if cp, err = getMeterBarCSS(); err != nil {
+		return
+	}
+	sc.AddProvider(cp, 600) // TOOD: hardcoded value
 	return
 }
 
@@ -150,6 +160,21 @@ func (m *vuMeter) SetValue(lvl *vuMeterLevel) {
 	m.red.SetValue(lvl.red)
 }
 
+func updateVUMeterLevels(left, right *vuMeter, data player.Meter) {
+	ch := len(data)
+	lval := &vuMeterLevel{0, 0, 0}
+	rval := &vuMeterLevel{0, 0, 0}
+	if ch >= 2 {
+		lval.setLevel(data[0].Peak)
+		rval.setLevel(data[1].Peak)
+	} else if ch == 1 {
+		lval.setLevel(data[0].Peak)
+		rval = lval
+	}
+	left.SetValue(lval)
+	right.SetValue(rval)
+}
+
 func addVUMeterGrid(frame *gtk.Frame, p *player.PlayerChan) (err error) {
 	var grid *gtk.Grid
 	if grid, err = gtk.GridNew(); err != nil {
@@ -166,20 +191,7 @@ func addVUMeterGrid(frame *gtk.Frame, p *player.PlayerChan) (err error) {
 	}
 
 	p.AddUpdateHandler(func(length time.Duration, pos time.Duration, meter player.Meter, userdata interface{}) bool {
-		glib.IdleAdd(func() {
-			ch := len(meter)
-			lval := &vuMeterLevel{0, 0, 0}
-			rval := &vuMeterLevel{0, 0, 0}
-			if ch >= 2 {
-				lval.setLevel(meter[0].Peak)
-				rval.setLevel(meter[1].Peak)
-			} else if ch == 1 {
-				lval.setLevel(meter[0].Peak)
-				rval = lval
-			}
-			left.SetValue(lval)
-			right.SetValue(rval)
-		})
+		glib.IdleAdd(func() { updateVUMeterLevels(left, right, meter) })
 		return true
 	}, nil)