Add a global Redraw method for TextWidget

Partially addresses #429, by centralizing widget drawing

modules/weatherservices/weather/display.go

@@ -9,31 +9,34 @@ import (
 )
 
 func (widget *Widget) display() {
+	err := ""
 	if widget.apiKeyValid() == false {
-		widget.View.SetText(" Environment variable WTF_OWM_API_KEY is not set")
-		return
+		err += " Environment variable WTF_OWM_API_KEY is not set\n"
 	}
 
 	cityData := widget.currentData()
 	if cityData == nil {
-		widget.View.SetText(" Weather data is unavailable: no city data")
-		return
+		err += " Weather data is unavailable: no city data\n"
 	}
 
 	if len(cityData.Weather) == 0 {
-		widget.View.SetText(" Weather data is unavailable: no weather data")
-		return
+		err += " Weather data is unavailable: no weather data"
 	}
 
-	widget.View.SetTitle(widget.title(cityData))
+	title := widget.CommonSettings.Title
+	var content string
+	if err != "" {
+		content = err
+	} else {
+		title = widget.title(cityData)
+		_, _, width, _ := widget.View.GetRect()
+		content = widget.settings.common.SigilStr(len(widget.Data), widget.Idx, width) + "\n"
+		content = content + widget.description(cityData) + "\n\n"
+		content = content + widget.temperatures(cityData) + "\n"
+		content = content + widget.sunInfo(cityData)
+	}
 
-	_, _, width, _ := widget.View.GetRect()
-	content := widget.settings.common.SigilStr(len(widget.Data), widget.Idx, width) + "\n"
-	content = content + widget.description(cityData) + "\n\n"
-	content = content + widget.temperatures(cityData) + "\n"
-	content = content + widget.sunInfo(cityData)
-
-	widget.View.SetText(content)
+	widget.Redraw(title, content, false)
 }
 
 func (widget *Widget) description(cityData *owm.CurrentWeatherData) string {

modules/weatherservices/weather/widget.go

@@ -27,7 +27,6 @@ type Widget struct {
 	Data []*owm.CurrentWeatherData
 	Idx  int
 
-	app      *tview.Application
 	settings *Settings
 }
 
@@ -40,7 +39,6 @@ func NewWidget(app *tview.Application, pages *tview.Pages, settings *Settings) *
 
 		Idx: 0,
 
-		app:      app,
 		settings: settings,
 	}
 
@@ -77,9 +75,7 @@ func (widget *Widget) Refresh() {
 		widget.Data = widget.Fetch(wtf.ToInts(widget.settings.cityIDs))
 	}
 
-	widget.app.QueueUpdateDraw(func() {
-		widget.display()
-	})
+	widget.display()
 }
 
 // Next displays data for the next city data in the list. If the current city is the last