fix up boxes to actually work when moved around the screen

ui/ui_test.go

@@ -0,0 +1,88 @@
+package ui
+
+import (
+	"fmt"
+	"testing"
+)
+
+func TestContainerOneBox(t *testing.T) {
+	expect := `┌─ box one ────────┐
+│                  │
+│                  │
+│                  │
+└──────────────────┘
+`
+	m := &MockScreen{}
+	one := NewBox("box one", nil, Contents{})
+	container := NewContainer(
+		Contents{{Container: one}},
+		LayoutHorizontalEven,
+	)
+	m.Init()
+	m.Resize(0, 0, 5, 20)
+	container.SetSize(0, 0, 5, 20)
+	container.Draw(m)
+	result := m.DumpContents()
+	if result != expect {
+		fmt.Printf("expected:\n%+v", expect)
+		fmt.Printf("actual:\n%+v", result)
+		t.Fail()
+	}
+}
+
+func TestContainerTwoBoxesHStack(t *testing.T) {
+	expect := `┌─ one ──┐┌─ two ──┐
+│        ││        │
+│        ││        │
+│        ││        │
+└────────┘└────────┘
+`
+	m := &MockScreen{}
+	one := NewBox("one", nil, Contents{})
+	two := NewBox("two", nil, Contents{})
+	container := NewContainer(
+		Contents{{Container: one}, {Container: two}},
+		LayoutHorizontalEven,
+	)
+	m.Init()
+	m.Resize(0, 0, 5, 20)
+	container.SetSize(0, 0, 5, 20)
+	container.Draw(m)
+	result := m.DumpContents()
+	if result != expect {
+		fmt.Printf("expected:\n%+v", expect)
+		fmt.Printf("actual:\n%+v", result)
+		t.Fail()
+	}
+}
+
+func TestContainerTwoBoxesVStack(t *testing.T) {
+	expect := `┌─ one ──┐
+│        │
+│        │
+│        │
+└────────┘
+┌─ two ──┐
+│        │
+│        │
+│        │
+└────────┘
+`
+	m := &MockScreen{}
+	one := NewBox("one", nil, Contents{})
+	two := NewBox("two", nil, Contents{})
+	container := NewContainer(
+		Contents{{Container: one}, {Container: two}},
+		LayoutVerticalEven,
+	)
+	m.Init()
+	m.Resize(0, 0, 10, 10)
+	container.SetSize(0, 0, 10, 10)
+	container.Draw(m)
+	result := m.DumpContents()
+	if result != expect {
+		fmt.Printf("expected:\n%+v", expect)
+		fmt.Printf("actual:\n%+v", result)
+		t.Fail()
+	}
+}