add controller logic for visualizations and add to gear menu

ui/controller/visualizations.go

@@ -0,0 +1,68 @@
+package controller
+
+import (
+	"math"
+	"time"
+
+	"fyne.io/fyne/v2"
+	"fyne.io/fyne/v2/lang"
+	"github.com/dweymouth/supersonic/ui/visualizations"
+)
+
+// embedded in parent controller struct
+type visualizationData struct {
+	peakMeter *visualizations.PeakMeter
+
+	visualizationAnim *fyne.Animation
+}
+
+func (c *Controller) InitVisualizations() {
+	c.App.LocalPlayer.OnStopped(c.stopVisualizationAnim)
+	c.App.LocalPlayer.OnPaused(c.stopVisualizationAnim)
+	c.App.LocalPlayer.OnPlaying(func() {
+		if c.peakMeter != nil {
+			c.startVisualizationAnim()
+		}
+	})
+}
+
+func (c *Controller) ShowPeakMeter() {
+	if c.peakMeter != nil {
+		return
+	}
+	win := fyne.CurrentApp().NewWindow(lang.L("Peak Meter"))
+	win.SetCloseIntercept(func() {
+		c.stopVisualizationAnim()
+		c.peakMeter = nil
+		win.Close()
+	})
+	c.peakMeter = visualizations.NewPeakMeter()
+	win.SetContent(c.peakMeter)
+	c.startVisualizationAnim()
+	win.Show()
+}
+
+func (c *Controller) stopVisualizationAnim() {
+	if c.visualizationAnim != nil {
+		c.visualizationAnim.Stop()
+		c.visualizationAnim = nil
+		c.App.LocalPlayer.SetPeaksEnabled(false)
+	}
+}
+
+func (c *Controller) startVisualizationAnim() {
+	if c.visualizationAnim == nil {
+		c.App.LocalPlayer.SetPeaksEnabled(true)
+		c.visualizationAnim = fyne.NewAnimation(
+			time.Duration(math.MaxInt64), /*until stopped*/
+			c.tickVisualizations)
+		c.visualizationAnim.Start()
+	}
+}
+
+func (c *Controller) tickVisualizations(_ float32) {
+	lP, rP, lRMS, rRMS := c.App.LocalPlayer.GetPeaks()
+	if c.visualizationData.peakMeter != nil {
+		c.visualizationData.peakMeter.UpdatePeaks(lP, rP, lRMS, rRMS)
+	}
+}