1 files changed, 36 insertions, 0 deletions
diff --git a/redo/mergeback/layout.go b/redo/mergeback/layout.go
new file mode 100644
index 0000000..e88cae4
--- /dev/null
+++ b/redo/mergeback/layout.go
@@ -0,0 +1,36 @@
+package ui
+
+// Recursively replaces nils with stretchy empty spaces and changes the orientation
+// of inner stack so they are perpenticular to each other.
+func resetControls(parent *Stack) {
+	for i, control := range parent.controls {
+		switch control.(type) {
+		case *Stack:
+			stack := control.(*Stack)
+			stack.orientation = !parent.orientation
+			resetControls(stack)
+		case nil:
+			emptySpace := newStack(horizontal)
+			parent.controls[i] = emptySpace
+			parent.stretchy[i] = true
+		}
+	}
+}
+
+// Creates a new Stack from the given controls. The topmost Stack will have
+// vertical orientation and margin borders, with each nested stack being
+// oriented oppositely. Controls are displayed with a default padding
+// between them.
+func Layout(controls ...Control) *Stack {
+	stack := &Stack{
+		orientation:  vertical,
+		controls:     controls,
+		stretchy:     make([]bool, len(controls)),
+		width:        make([]int, len(controls)),
+		height:       make([]int, len(controls)),
+	}
+
+	resetControls(stack)
+
+	return stack
+}