fix up boxes to actually work when moved around the screen

ui/mock.go

@@ -0,0 +1,116 @@
+package ui
+
+import (
+	"fmt"
+
+	"github.com/gdamore/tcell"
+)
+
+type coord struct {
+	x, y int
+}
+
+type MockScreen struct {
+	x, y, h, w int
+	content    map[coord]rune
+}
+
+func (m *MockScreen) Init() error {
+	m.content = map[coord]rune{}
+	return nil
+}
+
+func (m *MockScreen) Fini() {}
+
+func (m *MockScreen) Clear() {
+	m.content = map[coord]rune{}
+}
+
+func (m *MockScreen) Fill(rune, tcell.Style) {}
+
+func (m *MockScreen) SetCell(x int, y int, style tcell.Style, ch ...rune) {}
+
+func (m *MockScreen) GetContent(x, y int) (mainc rune, combc []rune, style tcell.Style, width int) {
+	return m.content[coord{x, y}], nil, tcell.StyleDefault, 1
+}
+
+func (m *MockScreen) SetContent(x int, y int, mainc rune, combc []rune, style tcell.Style) {
+	m.content[coord{x, y}] = mainc
+}
+
+func (m *MockScreen) SetStyle(style tcell.Style) {}
+
+func (m *MockScreen) ShowCursor(x int, y int) {}
+
+func (m *MockScreen) HideCursor() {}
+
+func (m *MockScreen) Size() (int, int) {
+	return m.h, m.w
+}
+
+func (m *MockScreen) PollEvent() tcell.Event {
+	return tcell.NewEventError(fmt.Errorf("mock error"))
+}
+
+func (m *MockScreen) PostEvent(ev tcell.Event) error {
+	return nil
+}
+
+func (m *MockScreen) PostEventWait(ev tcell.Event) {}
+
+func (m *MockScreen) EnableMouse() {}
+
+func (m *MockScreen) DisableMouse() {}
+
+func (m *MockScreen) HasMouse() bool {
+	return false
+}
+
+func (m *MockScreen) Colors() int {
+	return 0
+}
+
+func (m *MockScreen) Show() {}
+
+func (m *MockScreen) Sync() {}
+
+func (m *MockScreen) CharacterSet() string {
+	return "UTF-8"
+}
+
+func (m *MockScreen) RegisterRuneFallback(r rune, subst string) {}
+
+func (m *MockScreen) UnregisterRuneFallback(r rune) {}
+
+func (m *MockScreen) CanDisplay(r rune, checkFallbacks bool) bool {
+	return true
+}
+
+func (m *MockScreen) Resize(x, y, h, w int) {
+	m.x, m.y, m.h, m.w = x, y, h, w
+}
+
+func (m *MockScreen) HasKey(tcell.Key) bool {
+	return true
+}
+
+func (m *MockScreen) Beep() error {
+	return nil
+}
+
+func (m *MockScreen) DumpContents() string {
+	var res string
+	for i := m.y; i < m.h; i++ {
+		str := []rune{}
+		for j := m.x; j < m.w; j++ {
+			r, ok := m.content[coord{x: j, y: i}]
+			if ok {
+				str = append(str, r)
+			} else {
+				str = append(str, ' ')
+			}
+		}
+		res = res + string(str) + "\n"
+	}
+	return res
+}

ui/ui.go

@@ -59,10 +59,10 @@ func (c *Container) SetSize(x, y, h, w int) {
 	if c.layoutMethod == LayoutVerticalEven {
 		num := len(c.contents)
 		for r := range c.contents {
-			x := c.x
-			y := c.y + (num * (r + 1))
-			h := c.h / num
 			w := c.w
+			h := c.h / num
+			x := c.x
+			y := c.y + (h * r)
 			c.contents[r].Container.SetSize(x, y, h, w)
 		}
 	} else if c.layoutMethod == LayoutHorizontalEven {
@@ -124,18 +124,18 @@ func (b *Box) SetSize(x, y, h, w int) {
 }
 
 func (b *Box) Draw(s tcell.Screen) {
-	for m := 1; m < b.w-1; m++ {
+	for m := b.x + 1; m < b.x+b.w-1; m++ {
 		s.SetContent(m, b.y, tcell.RuneHLine, nil, tcell.StyleDefault)
-		s.SetContent(m, b.h-1, tcell.RuneHLine, nil, tcell.StyleDefault)
+		s.SetContent(m, b.y+b.h-1, tcell.RuneHLine, nil, tcell.StyleDefault)
 	}
-	for m := 1; m < b.h-1; m++ {
+	for m := b.y + 1; m < b.y+b.h-1; m++ {
 		s.SetContent(b.x, m, tcell.RuneVLine, nil, tcell.StyleDefault)
-		s.SetContent(b.w-1, m, tcell.RuneVLine, nil, tcell.StyleDefault)
+		s.SetContent(b.x+b.w-1, m, tcell.RuneVLine, nil, tcell.StyleDefault)
 	}
 	s.SetContent(b.x, b.y, tcell.RuneULCorner, nil, tcell.StyleDefault)
-	s.SetContent(b.w-1, b.y, tcell.RuneURCorner, nil, tcell.StyleDefault)
+	s.SetContent(b.x+b.w-1, b.y, tcell.RuneURCorner, nil, tcell.StyleDefault)
-	s.SetContent(b.x, b.h-1, tcell.RuneLLCorner, nil, tcell.StyleDefault)
+	s.SetContent(b.x, b.y+b.h-1, tcell.RuneLLCorner, nil, tcell.StyleDefault)
-	s.SetContent(b.w-1, b.h-1, tcell.RuneLRCorner, nil, tcell.StyleDefault)
+	s.SetContent(b.x+b.w-1, b.y+b.h-1, tcell.RuneLRCorner, nil, tcell.StyleDefault)
 
 	if b.title != nil {
 		b.title.Draw(s)
@@ -215,6 +215,9 @@ func (p *PaddedText) SetSize(x, y, _, _ int) {
 }
 
 func (p *PaddedText) Draw(s tcell.Screen) {
+	if p.text == "" {
+		return
+	}
 	t := p.x
 	s.SetContent(t, p.y, ' ', nil, tcell.StyleDefault)
 	t++

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()
+	}
+}