Pack() or Place() multiple times updates the config

frame.go

@@ -13,8 +13,8 @@ type Frame struct {
 	BaseWidget
 
 	// Widget placement settings.
-	packs   map[Side][]packedWidget // Packed widgets
+	packs   map[Side][]*packedWidget // Packed widgets
-	placed  []placedWidget          // Placed widgets
+	placed  []*placedWidget          // Placed widgets
 	widgets []Widget
 }
 
@@ -22,7 +22,7 @@ type Frame struct {
 func NewFrame(name string) *Frame {
 	w := &Frame{
 		Name:    name,
-		packs:   map[Side][]packedWidget{},
+		packs:   map[Side][]*packedWidget{},
 		widgets: []Widget{},
 	}
 	w.SetBackground(render.RGBA(1, 0, 0, 0)) // invisible default BG
@@ -37,7 +37,7 @@ func NewFrame(name string) *Frame {
 // Setup ensures all the Frame's data is initialized and not null.
 func (w *Frame) Setup() {
 	if w.packs == nil {
-		w.packs = map[Side][]packedWidget{}
+		w.packs = map[Side][]*packedWidget{}
 	}
 	if w.widgets == nil {
 		w.widgets = []Widget{}

frame_pack.go

@@ -31,9 +31,17 @@ func (w *Frame) Pack(child Widget, config ...Pack) {
 		C = config[0]
 	}
 
+	// Update an already placed widget.
+	for _, current := range w.packs[C.Side] {
+		if current.widget == child {
+			current.pack = C
+			return
+		}
+	}
+
 	// Initialize the pack list for this side?
 	if _, ok := w.packs[C.Side]; !ok {
-		w.packs[C.Side] = []packedWidget{}
+		w.packs[C.Side] = []*packedWidget{}
 	}
 
 	// Padding: if the user only provided Padding add it to both
@@ -51,7 +59,7 @@ func (w *Frame) Pack(child Widget, config ...Pack) {
 	// Adopt the child widget so it can access the Frame.
 	child.SetParent(w)
 
-	w.packs[C.Side] = append(w.packs[C.Side], packedWidget{
+	w.packs[C.Side] = append(w.packs[C.Side], &packedWidget{
 		widget: child,
 		pack:   C,
 	})
@@ -63,7 +71,7 @@ func (w *Frame) Unpack(child Widget) bool {
 	var any = false
 	for side, widgets := range w.packs {
 		var (
-			replace = []packedWidget{}
+			replace = []*packedWidget{}
 			found   = false
 		)
 
@@ -98,8 +106,8 @@ func (w *Frame) computePacked(e render.Engine) {
 		// so we can expand them to fill remaining space in fixed size Frames.
 		maxWidth  int
 		maxHeight int
-		visited   = []packedWidget{}
+		visited   = []*packedWidget{}
-		expanded  = []packedWidget{}
+		expanded  = []*packedWidget{}
 	)
 
 	// Iterate through all directions and compute how much space to

frame_place.go

@@ -37,9 +37,18 @@ type placedWidget struct {
 	place  Place
 }
 
-// Place a widget into the frame.
+// Place a widget into the frame. You may call Place on a widget multiple times to update its configuration.
 func (w *Frame) Place(child Widget, config Place) {
-	w.placed = append(w.placed, placedWidget{
+	// Update an already placed widget.
+	for _, current := range w.placed {
+		if current.widget == child {
+			current.place = config
+			return
+		}
+	}
+
+	// Append it.
+	w.placed = append(w.placed, &placedWidget{
 		widget: child,
 		place:  config,
 	})
@@ -89,6 +98,7 @@ func (w *Frame) computePlaced(e render.Engine) {
 			if row.place.Middle {
 				moveTo.Y = frameSize.H - (w.Size().H / 2) - (row.widget.Size().H / 2)
 			}
+
 			row.widget.MoveTo(moveTo)
 			row.widget.Compute(e)
 		}