app/internal/wm: change Options fields from values to pointers

Switching to pointer values in Options, including using window manager defaults for size and title, in preparation for updating options on the fly.

Signed-off-by: pierre <pierre.curto@gmail.com>

app/window.go

@@ -84,11 +84,10 @@ var ackEvent event.Event
 // Calling NewWindow more than once is not supported on
 // iOS, Android, WebAssembly.
 func NewWindow(options ...Option) *Window {
-	opts := &wm.Options{
-		Width:  unit.Dp(800),
-		Height: unit.Dp(600),
-		Title:  "Gio",
-	}
+	opts := new(wm.Options)
+	// Default options.
+	Size(unit.Px(800), unit.Px(600))(opts)
+	Title("Gio")(opts)
 
 	for _, o := range options {
 		o(opts)
@@ -456,14 +455,14 @@ const (
 // Supported platforms are macOS, X11 and Windows.
 func WindowMode(mode wm.WindowMode) Option {
 	return func(opts *wm.Options) {
-		opts.WindowMode = mode
+		opts.WindowMode = &mode
 	}
 }
 
 // Title sets the title of the wm.
 func Title(t string) Option {
 	return func(opts *wm.Options) {
-		opts.Title = t
+		opts.Title = &t
 	}
 }
 
@@ -476,8 +475,10 @@ func Size(w, h unit.Value) Option {
 		panic("height must be larger than or equal to 0")
 	}
 	return func(opts *wm.Options) {
-		opts.Width = w
-		opts.Height = h
+		opts.Size = &wm.Size{
+			Width:  w,
+			Height: h,
+		}
 	}
 }
 
@@ -490,8 +491,10 @@ func MaxSize(w, h unit.Value) Option {
 		panic("height must be larger than or equal to 0")
 	}
 	return func(opts *wm.Options) {
-		opts.MaxWidth = w
-		opts.MaxHeight = h
+		opts.MaxSize = &wm.Size{
+			Width:  w,
+			Height: h,
+		}
 	}
 }
 
@@ -504,8 +507,10 @@ func MinSize(w, h unit.Value) Option {
 		panic("height must be larger than or equal to 0")
 	}
 	return func(opts *wm.Options) {
-		opts.MinWidth = w
-		opts.MinHeight = h
+		opts.MinSize = &wm.Size{
+			Width:  w,
+			Height: h,
+		}
 	}
 }