refactor all container widgets into subpackage

cwidgets/expanded/mem.go

@@ -0,0 +1,41 @@
+package expanded
+
+import (
+	"github.com/bcicen/ctop/cwidgets"
+	ui "github.com/gizak/termui"
+)
+
+type ExpandedMem struct {
+	*ui.BarChart
+	hist IntHist
+}
+
+func NewExpandedMem() *ExpandedMem {
+	mem := &ExpandedMem{
+		ui.NewBarChart(),
+		NewIntHist(8),
+	}
+	mem.BorderLabel = "MEM"
+	mem.Height = 10
+	mem.Width = 50
+	mem.BarWidth = 5
+	mem.BarGap = 1
+	mem.X = 0
+	mem.Y = 14
+	mem.TextColor = ui.ColorDefault
+	mem.Data = mem.hist.data
+	mem.BarColor = ui.ColorGreen
+	mem.DataLabels = mem.hist.labels
+	mem.NumFmt = cwidgets.ByteFormatInt
+	return mem
+}
+
+func (w *ExpandedMem) Update(val int, limit int) {
+	// implement our own scaling for mem graph
+	if val*4 < limit {
+		w.SetMax(val * 4)
+	} else {
+		w.SetMax(limit)
+	}
+	w.hist.Append(val)
+}