Improve tk show UI (grafana#71)

pkg/term/pager.go

@@ -5,11 +5,13 @@ import (
 	"github.com/rivo/tview"
 )
 
+// PageItem represents a single item to be viewed
 type PageItem struct {
 	Name    string
 	Content string
 }
 
+// Page shows an application viewer allowing the review of specific resources
 func Page(items []PageItem) error {
 	app := tview.NewApplication()
 
@@ -22,13 +24,13 @@ func Page(items []PageItem) error {
 
 	// right side: text view
 	text := tview.NewTextView().SetText(items[0].Content).SetDynamicColors(true)
-	text.Box = text.Box.SetBorder(true)
+	text.Box = text.Box.SetBorder(true).SetTitle("Resource")
 
 	// left side: resource chooser
 	list := tview.NewList().
 		ShowSecondaryText(false).
 		SetHighlightFullLine(true)
-	list.Box = list.Box.SetBorder(true).SetTitle("Resources")
+	list.Box = list.Box.SetBorder(true).SetTitle("Resources").SetBorderAttributes(tcell.AttrBold)
 
 	selectItem := func(i int) {
 		text.SetText(items[i].Content)
@@ -45,17 +47,29 @@ func Page(items []PageItem) error {
 
 	// layout container
 	flex := tview.NewFlex().SetDirection(tview.FlexColumn).
-		AddItem(list, 0, 1, false).
-		AddItem(text, 0, 4, true)
+		AddItem(list, 0, 1, true).
+		AddItem(text, 0, 4, false)
+
+	isListSelected := true
 
 	// custom key handler
 	app.SetInputCapture(func(event *tcell.EventKey) *tcell.EventKey {
 		switch event.Key() {
-		case tcell.KeyTAB, tcell.KeyBacktab:
-			list.InputHandler()(event, nil)
-			selectItem(list.GetCurrentItem())
-		case tcell.KeyCtrlC:
-			return event
+		case tcell.KeyDown, tcell.KeyUp:
+			if isListSelected {
+				list.InputHandler()(event, nil)
+				selectItem(list.GetCurrentItem())
+			} else {
+				text.InputHandler()(event, nil)
+			}
+		case tcell.KeyTAB, tcell.KeyRight:
+			isListSelected = false
+			app.SetFocus(text)
+		case tcell.KeyBacktab, tcell.KeyLeft:
+			isListSelected = true
+			app.SetFocus(list)
+		case tcell.KeyCtrlC, tcell.KeyEscape:
+			return tcell.NewEventKey(tcell.KeyCtrlC, event.Rune(), event.Modifiers())
 		default:
 			text.InputHandler()(event, nil)
 		}