NewApplicationWindow automatically sets an application icon

application.go

@@ -2,6 +2,7 @@ package nasin
 
 import "log"
 import "image"
+import "strings"
 import "git.tebibyte.media/tomo/tomo"
 import "git.tebibyte.media/tomo/nasin/internal/registrar"
 
@@ -76,6 +77,15 @@ type ApplicationRole string; const (
 	RoleChecklist         ApplicationRole = "Checklist"
 )
 
+// Icon returns the icon ID for this role.
+func (role ApplicationRole) Icon () tomo.Icon {
+	if role == "" {
+		return tomo.IconApplication
+	} else {
+		return tomo.Icon("Application" + strings.ReplaceAll(string(role), " ", ""))
+	}
+}
+
 // RunApplication is like tomo.Run, but runs an application. If something fails
 // to initialize, an error is written to the standard logger.
 func RunApplication (application Application) {
@@ -90,10 +100,37 @@ func RunApplication (application Application) {
 
 // NewApplicationWindow creates a window for an application. It will
 // automatically set window information to signal to the OS that the window is
-// owned by the application.
+// owned by the application. The window's icon will be automatically set by
+// looking for an icon with the name of the application's ID. If that is not
+// found, the default icon for the application's ApplicationRole will used.
 func NewApplicationWindow (application Application, bounds image.Rectangle) (tomo.MainWindow, error) {
 	window, err := tomo.NewWindow(bounds)
 	if err != nil { return nil, err }
-	window.SetTitle(application.Describe().String())
+	description := application.Describe()
+	window.SetTitle(description.Name)
+	setApplicationWindowIcon(window, description)
 	return window, nil
 }
+
+func setApplicationWindowIcon (window tomo.Window, description ApplicationDescription) {
+	allSizes := func (icon tomo.Icon) (sizes []image.Image) {
+		small  := icon.Texture(tomo.IconSizeSmall)
+		medium := icon.Texture(tomo.IconSizeMedium)
+		large  := icon.Texture(tomo.IconSizeLarge)
+		if small  != nil { sizes = append(sizes,  small) }
+		if medium != nil { sizes = append(sizes, medium) }
+		if large  != nil { sizes = append(sizes,  large) }
+		return sizes
+	}
+
+	if sizes := allSizes(tomo.Icon(description.ID)); len(sizes) > 0 {
+		println("direct icon worked", tomo.Icon(description.ID))
+		window.SetIcon(sizes...)
+		return
+	}
+	if sizes := allSizes(description.Role.Icon()); len(sizes) > 0 {
+		println("role icon worked", description.Role.Icon())
+		window.SetIcon(sizes...)
+		return
+	}
+}