Add padding and margin layouts

uilayout/margin.go

@@ -0,0 +1,45 @@
+package uilayout
+
+import "fyne.io/fyne/v2"
+
+type Margin struct {
+	top    float32
+	bottom float32
+	left   float32
+	right  float32
+}
+
+func NewMargin(
+	top, bottom, left, right float32,
+) *Margin {
+	return &Margin{
+		top:    top,
+		bottom: bottom,
+		left:   left,
+		right:  right,
+	}
+}
+
+func (m *Margin) MinSize(objects []fyne.CanvasObject) fyne.Size {
+	w := m.left + m.right
+	h := m.top + m.bottom
+	if len(objects) > 0 {
+		w += objects[0].MinSize().Width
+		h += objects[0].MinSize().Height
+	}
+	return fyne.NewSize(w, h)
+}
+
+func (m *Margin) Layout(
+	objects []fyne.CanvasObject,
+	containerSize fyne.Size,
+) {
+	pos := fyne.NewPos(m.left, m.top)
+	if len(objects) > 0 {
+		o := objects[0]
+		size := containerSize.Subtract(
+			fyne.NewSize(m.left+m.right, m.top+m.bottom))
+		o.Resize(size)
+		o.Move(pos)
+	}
+}

uilayout/padding.go

@@ -0,0 +1,45 @@
+package uilayout
+
+import "fyne.io/fyne/v2"
+
+type Padding struct {
+	top    float32
+	bottom float32
+	left   float32
+	right  float32
+}
+
+func NewPadding(
+	top, bottom, left, right float32,
+) *Padding {
+	return &Padding{
+		top:    top,
+		bottom: bottom,
+		left:   left,
+		right:  right,
+	}
+}
+
+func (p *Padding) MinSize(objects []fyne.CanvasObject) fyne.Size {
+	w := p.left + p.right
+	h := p.top + p.bottom
+	if len(objects) > 0 {
+		w += objects[0].MinSize().Width
+		h += objects[0].MinSize().Height
+	}
+	return fyne.NewSize(w, h)
+}
+
+func (p *Padding) Layout(
+	objects []fyne.CanvasObject,
+	containerSize fyne.Size,
+) {
+	pos := fyne.NewPos(p.left, p.top)
+	if len(objects) > 0 {
+		o := objects[0]
+		size := containerSize.Subtract(
+			fyne.NewSize(p.left+p.right, p.top+p.bottom))
+		o.Resize(size)
+		o.Move(pos)
+	}
+}