Working on v2

old/screen.go

@@ -0,0 +1,74 @@
+package main
+
+import (
+	"errors"
+	"time"
+
+	termbox "github.com/nsf/termbox-go"
+)
+
+type Screen interface {
+	handleKeyEvent(termbox.Event) int
+	initialize(Bundle) error
+	drawScreen()
+}
+
+const (
+	ScreenMain = iota
+	ScreenAbout
+	ScreenExit
+
+	DefaultBg = termbox.ColorBlack
+	DefaultFg = termbox.ColorWhite
+	TitleFg   = termbox.ColorWhite
+	TitleBg   = termbox.ColorBlue
+	CursorFg  = termbox.ColorBlack
+	CursorBg  = termbox.ColorGreen
+)
+
+func (a *AppState) BuildScreens() {
+	mainScreen := MainScreen{}
+	aboutScreen := AboutScreen{}
+	a.screens = append(a.screens, &mainScreen)
+	a.screens = append(a.screens, &aboutScreen)
+}
+
+func (a *AppState) drawBackground(bg termbox.Attribute) {
+	termbox.Clear(0, bg)
+}
+
+func (a *AppState) layoutAndDrawScreen(s Screen) {
+	a.drawBackground(DefaultBg)
+	s.drawScreen()
+	termbox.Flush()
+}
+
+func readUserInput(e chan termbox.Event) {
+	for {
+		e <- termbox.PollEvent()
+	}
+}
+
+func checkForUpdate(e chan termbox.Event) {
+	for {
+		time.Sleep(time.Minute)
+		// Check if the on-disk tasklist has changed
+		//app.LoadTasklist()
+		//app.LoadDoneList()
+		if false {
+			e <- termbox.Event{
+				Type: termbox.EventError,
+				Err:  errors.New("List changed elsewhere"),
+			}
+		}
+	}
+}
+
+/*
+ * ViewPort helps keep track of what's being displayed on the screen
+ */
+type ViewPort struct {
+	bytesPerRow  int
+	numberOfRows int
+	firstRow     int
+}