add basic cursor

grid.go

@@ -7,6 +7,7 @@ import (
 )
 
 type Grid struct {
+	cursorPos  uint
 	containers map[string]*Container
 }
 
@@ -14,6 +15,11 @@ func (g *Grid) AddContainer(id string) {
 	g.containers[id] = NewContainer(id)
 }
 
+// Return number of containers/rows
+func (g *Grid) Len() uint {
+	return uint(len(g.containers))
+}
+
 // Return sorted list of active container IDs
 func (g *Grid) CIDs() []string {
 	var ids []string
@@ -24,6 +30,21 @@ func (g *Grid) CIDs() []string {
 	return ids
 }
 
+// Redraw the cursor with the currently selected row
+func (g *Grid) Cursor() {
+	for n, id := range g.CIDs() {
+		c := g.containers[id]
+		if uint(n) == g.cursorPos {
+			c.widgets.cid.TextFgColor = ui.ColorDefault
+			c.widgets.cid.TextBgColor = ui.ColorWhite
+		} else {
+			c.widgets.cid.TextFgColor = ui.ColorWhite
+			c.widgets.cid.TextBgColor = ui.ColorDefault
+		}
+	}
+	ui.Render(ui.Body)
+}
+
 func (g *Grid) Rows() (rows []*ui.Row) {
 	for _, cid := range g.CIDs() {
 		c := g.containers[cid]
@@ -88,20 +109,25 @@ func Display(g *Grid) {
 
 	// calculate layout
 	ui.Body.Align()
-
+	g.Cursor()
 	ui.Render(ui.Body)
 
+	ui.Handle("/sys/kbd/<up>", func(ui.Event) {
+		if g.cursorPos > 0 {
+			g.cursorPos -= 1
+			g.Cursor()
+		}
+	})
+	ui.Handle("/sys/kbd/<down>", func(ui.Event) {
+		if g.cursorPos < (g.Len() - 1) {
+			g.cursorPos += 1
+			g.Cursor()
+		}
+	})
 	ui.Handle("/sys/kbd/q", func(ui.Event) {
 		ui.StopLoop()
 	})
 	ui.Handle("/timer/1s", func(e ui.Event) {
-		//		t := e.Data.(ui.EvtTimer)
-		//		i := t.Count
-		//		if i > 103 {
-		//			ui.StopLoop()
-		//			return
-		//		}
-
 		ui.Render(ui.Body)
 	})
 

main.go

@@ -42,7 +42,7 @@ func main() {
 		containers = os.Args[1:]
 	}
 
-	g := &Grid{make(map[string]*Container)}
+	g := &Grid{0, make(map[string]*Container)}
 	for _, c := range containers {
 		g.AddContainer(c)
 	}

widgets.go

@@ -9,6 +9,7 @@ import (
 
 type Widgets struct {
 	cid    *ui.Par
+	names  *ui.Par
 	cpu    *ui.Gauge
 	net    *ui.Gauge
 	memory *ui.Gauge