first commit

ui/layout/centerpadlayout.go

@@ -0,0 +1,39 @@
+package layout
+
+import (
+	"fyne.io/fyne/v2"
+)
+
+var _ fyne.Layout = (*CenterPadLayout)(nil)
+
+type CenterPadLayout struct {
+	PadLeftRight float32
+	PadTopBottom float32
+}
+
+// only supports one object
+func (c *CenterPadLayout) MinSize(objects []fyne.CanvasObject) fyne.Size {
+	if len(objects) == 0 {
+		return fyne.NewSize(0, 0)
+	}
+	return fyne.Size{
+		Width:  objects[0].MinSize().Width + c.PadLeftRight*2,
+		Height: objects[0].MinSize().Height + c.PadTopBottom*2,
+	}
+}
+
+func (c *CenterPadLayout) Layout(objects []fyne.CanvasObject, size fyne.Size) {
+	if len(objects) == 0 {
+		return
+	}
+	objSize := objects[0].MinSize()
+	xOffs := (size.Width - objSize.Width) / 2
+	yOffs := (size.Height - objSize.Height) / 2
+	for _, child := range objects {
+		if !child.Visible() {
+			continue
+		}
+		child.Move(fyne.NewPos(xOffs, yOffs))
+		child.Resize(child.MinSize())
+	}
+}