V.0.1.0 Codename Threadbare

Development branch for milestone v.0.1.0 Codename Threadbare.

Please keep using feature branches and merge them against v.0.1.0-codename-threadbare.

cmd/gosdn-tview/app/app.go

+package app
+
+//TODO: App should be a Singleton i guess
+import (
+	"github.com/rivo/tview"
+)
+
+type view interface {
+	GetContent() tview.Primitive
+}
+
+//App is a GUI-Application bases on tview
+type App struct {
+	app   *tview.Application
+	pages *tview.Pages
+}
+
+//NewApp creates a new GUI-Application
+func NewApp() *App {
+	a := &App{
+		app: tview.NewApplication(),
+	}
+
+	return a
+}
+
+//SetRoot sets the root of the GUI-Application
+func (a *App) SetRoot(v view) {
+	a.pages = v.GetContent().(*tview.Pages)
+	a.app.SetRoot(a.pages, true)
+}
+
+//SwitchPage switches to the given (as string) tview page
+func (a *App) SwitchPage(s string) {
+	if a.pages.HasPage(s) {
+		a.pages.SwitchToPage(s)
+	}
+}
+
+//AddPage adds a new view as page that can be switched to
+func (a *App) AddPage(name string, p view) {
+	a.pages.AddPage(name, p.GetContent(), true, false)
+}
+
+//Run starts the GUI-Application
+func (a *App) Run() error {
+	return a.app.Run()
+}
+
+//Stop stops the GUI-Application
+func (a *App) Stop() {
+	a.app.Stop()
+}
+
+//Draw calls tview.Draw()
+func (a *App) Draw() {
+	a.app.Draw()
+}
+
+//QueueUpdateDraw calls tview.QueueUpdateDraw()
+func (a *App) QueueUpdateDraw(f func()) {
+	a.app.QueueUpdateDraw(f)
+}
+
+//SetFocus sets the focus on new tview.Primitive
+func (a *App) SetFocus(v tview.Primitive) {
+	a.app.SetFocus(v)
+}