New Widget: TabFrame

* Added the TabFrame widget with an example program and screenshot * Button: FixedColor=true to set a consistent background color and not worry about it with mouseover/down events.
2021-07-25 20:53:09 -07:00 · 2021-07-25 20:53:09 -07:00 · 5d16f5d50c
commit 5d16f5d50c
parent e7e8b4b2c1
12 changed files with 648 additions and 181 deletions
--- a/README.md
+++ b/README.md
@ -113,6 +113,7 @@ most complex.
  * Place() lets you place child widgets relative to the parent. You can place
    it at an exact Point, or against the Top, Left, Bottom or Right sides, or
    aligned to the Center (horizontal) or Middle (vertical) of the parent.
+    [Example](eg/frame-place)
 * [x] **Label**: Textual labels for your UI.
  * Supports TrueType fonts, color, stroke, drop shadow, font size, etc.
  * Variable binding support: TextVariable or IntVariable can point to a
@ -136,18 +137,20 @@ most complex.
  * Works the same as CheckButton and RadioButton but draws a separate
    label next to a small check button. Clicking the label will toggle the
    state of the checkbox.
+* [x] **TabFrame:** a collection of Frames navigated between using a row
+  of tab buttons along their top edge. [Example](eg/tabframe).
 * [x] **Pager**: a series of numbered buttons to use with a paginated UI.
  Includes "Forward" and "Next" buttons and buttons for each page number.
 * [x] **Window**: a Frame with a title bar Frame on top.
  * Can be managed by Supervisor to give Window Manager controls to it
    (drag it by its title bar, Close button, window focus, multiple overlapping
-    windows, and so on).
-* [x] **Tooltip**: a mouse hover label attached to a widget.
+    windows, and so on). [Example](eg/windows)
+* [x] **Tooltip**: a mouse hover label attached to a widget. [Example](eg/tooltip)
 * [x] **MenuButton**: a button that opens a modal pop-up menu on click.
 * [x] **MenuBar**: a specialized Frame that groups a bunch of MenuButtons and
  provides a simple API to add menus and items to it.
 * [x] **Menu**: a frame full of clickable links and separators. Usually used as
-  a modal pop-up by the MenuButton and MenuBar.
+  a modal pop-up by the MenuButton and MenuBar. [Example](eg/menus)
 * [x] **SelectBox**: a kind of MenuButton that lets the user choose a
  value from a list of possible values.

--- a/button.go
+++ b/button.go
@ -11,9 +11,14 @@ import (
 // Button is a clickable button.
 type Button struct {
 	BaseWidget
+	Name  string
 	child Widget
 	style *style.Button

+	// Set this true to hard-set a color for this button;
+	// it will not adjust on mouse-over or press.
+	FixedColor bool
+
 	// Private options.
 	hovering bool
 	clicked  bool
@ -22,28 +27,33 @@ type Button struct {
 // NewButton creates a new Button.
 func NewButton(name string, child Widget) *Button {
 	w := &Button{
+		Name:  name,
 		child: child,
 		style: &style.DefaultButton,
 	}
 	w.IDFunc(func() string {
-		return fmt.Sprintf("Button<%s>", name)
+		return fmt.Sprintf("Button<%s>", w.Name)
 	})

 	w.SetStyle(Theme.Button)

 	w.Handle(MouseOver, func(e EventData) error {
 		w.hovering = true
-		w.SetBackground(w.style.HoverBackground)
-		if label, ok := w.child.(*Label); ok {
-			label.Font.Color = w.style.HoverForeground
+		if !w.FixedColor {
+			w.SetBackground(w.style.HoverBackground)
+			if label, ok := w.child.(*Label); ok {
+				label.Font.Color = w.style.HoverForeground
+			}
 		}
 		return nil
 	})
 	w.Handle(MouseOut, func(e EventData) error {
 		w.hovering = false
-		w.SetBackground(w.style.Background)
-		if label, ok := w.child.(*Label); ok {
-			label.Font.Color = w.style.Foreground
+		if !w.FixedColor {
+			w.SetBackground(w.style.Background)
+			if label, ok := w.child.(*Label); ok {
+				label.Font.Color = w.style.Foreground
+			}
 		}
 		return nil
 	})
@ -83,6 +93,11 @@ func (w *Button) SetStyle(v *style.Button) {
 	}
 }

+// GetStyle gets the button style.
+func (w *Button) GetStyle() *style.Button {
+	return w.style
+}
+
 // Children returns the button's child widget.
 func (w *Button) Children() []Widget {
 	return []Widget{w.child}
--- a/eg/README.md
+++ b/eg/README.md
@ -14,3 +14,5 @@ screenshot and description:
 * [Menus](menus/): demonstrates various Menu Buttons and a Menu Bar.
 * [Themes](themes/): a UI demo that shows off the Default, Flat, and Dark UI
  themes as part of experimental theming support.
+* [TabFrame](tabframe/): demo for the TabFrame widget showing multiple Windows
+  with tabbed interfaces.
--- a/eg/tabframe/README.md
+++ b/eg/tabframe/README.md
@ -0,0 +1,11 @@
+# TabFrame Demo
+
+![Screenshot](screenshot.png)
+
+This demo shows off the TabFrame widget, in multiple copies of a
+pop-up Window widget.
+
+## Running It
+
+From your terminal, just type `go run main.go` from this
+example's directory.
--- a/eg/tabframe/main.go
+++ b/eg/tabframe/main.go
@ -0,0 +1,267 @@
+package main
+
+// See the MakeTabFrame() function just below for the meat of this example.
+
+import (
+	"fmt"
+	"os"
+
+	"git.kirsle.net/go/render"
+	"git.kirsle.net/go/render/event"
+	"git.kirsle.net/go/render/sdl"
+	"git.kirsle.net/go/ui"
+	"git.kirsle.net/go/ui/theme"
+)
+
+// Program globals.
+var (
+	// Size of the MainWindow.
+	Width  = 1024
+	Height = 768
+
+	// Cascade offset for creating multiple windows.
+	Cascade      = render.NewPoint(10, 32)
+	CascadeStep  = render.NewPoint(24, 24)
+	CascadeLoops = 1
+
+	// Colors for each window created.
+	WindowColors = []render.Color{
+		render.Blue,
+		render.Red,
+		render.DarkYellow,
+		render.DarkGreen,
+		render.DarkCyan,
+		render.DarkBlue,
+		render.DarkRed,
+	}
+	WindowID    int
+	OpenWindows int
+
+	TabFont = render.Text{
+		Size:    10,
+		Color:   render.Black,
+		Padding: 4,
+	}
+)
+
+func init() {
+	sdl.DefaultFontFilename = "../DejaVuSans.ttf"
+}
+
+// MakeTabFrame is the example use of the TabFrame widget.
+// The rest of this file is basically a copy of the eg/windows
+// demo, except each window embeds the TabFrame.
+func MakeTabFrame(mw *ui.MainWindow) *ui.TabFrame {
+	notebook := ui.NewTabFrame("Example")
+
+	// AddTab gives you the Frame to populate for that tab.
+
+	// First Tab contents.
+	tab1 := notebook.AddTab("Tab 1", ui.NewLabel(ui.Label{
+		Text: "First Tab",
+		Font: TabFont,
+	}))
+	{
+		label := ui.NewLabel(ui.Label{
+			Text: "Hello world",
+			Font: render.Text{
+				Size:  24,
+				Color: render.SkyBlue,
+			},
+		})
+		tab1.Pack(label, ui.Pack{
+			Side: ui.N,
+		})
+
+		label2 := ui.NewLabel(ui.Label{
+			Text: "This is the text content of the first\n" +
+				"of the three tab frames.",
+			Font: render.Text{
+				Size:  10,
+				Color: render.SkyBlue.Darken(40),
+			},
+		})
+		tab1.Pack(label2, ui.Pack{
+			Side: ui.N,
+			PadY: 8,
+		})
+	}
+
+	// Second Tab.
+	tab2 := notebook.AddTab("Tab 2", ui.NewLabel(ui.Label{
+		Text: "Second",
+		Font: TabFont,
+	}))
+	{
+		label := ui.NewLabel(ui.Label{
+			Text: "Goodbye Mars",
+			Font: render.Text{
+				Size:  24,
+				Color: render.Orange,
+			},
+		})
+		tab2.Pack(label, ui.Pack{
+			Side: ui.N,
+		})
+
+		label2 := ui.NewLabel(ui.Label{
+			Text: "This is the text content of the second\n" +
+				"of the three tab frames.\n\nIt has longer text\nin it!",
+			Font: render.Text{
+				Size:  10,
+				Color: render.Orange.Darken(20),
+			},
+		})
+		tab2.Pack(label2, ui.Pack{
+			Side: ui.N,
+			PadY: 8,
+		})
+	}
+
+	// Third Tab.
+	tab3 := notebook.AddTab("Tab 3", ui.NewLabel(ui.Label{
+		Text: "Third",
+		Font: TabFont,
+	}))
+	{
+		label := ui.NewLabel(ui.Label{
+			Text: "The Third Tab",
+			Font: render.Text{
+				Size:  24,
+				Color: render.Pink,
+			},
+		})
+		tab3.Pack(label, ui.Pack{
+			Side: ui.N,
+		})
+
+		label2 := ui.NewLabel(ui.Label{
+			Text: "This is the text content of the third\n" +
+				"of the tab frames.",
+			Font: render.Text{
+				Size:  10,
+				Color: render.Pink.Darken(40),
+			},
+		})
+		tab3.Pack(label2, ui.Pack{
+			Side: ui.N,
+			PadY: 8,
+		})
+	}
+
+	notebook.Supervise(mw.Supervisor())
+
+	// notebook.SetBackground(render.DarkGrey)
+	return notebook
+}
+
+func main() {
+	mw, err := ui.NewMainWindow("TabFrame Example", Width, Height)
+	if err != nil {
+		panic(err)
+	}
+
+	// Dark theme.
+	// ui.Theme = theme.DefaultDark
+
+	// Menu bar.
+	menu := ui.NewMenuBar("Main Menu")
+	file := menu.AddMenu("UI Theme")
+	file.AddItem("Default", func() {
+		ui.Theme = theme.Default
+		addWindow(mw)
+	})
+	file.AddItem("DefaultFlat", func() {
+		ui.Theme = theme.DefaultFlat
+		addWindow(mw)
+	})
+	file.AddItem("DefaultDark", func() {
+		ui.Theme = theme.DefaultDark
+		addWindow(mw)
+	})
+	file.AddSeparator()
+	file.AddItem("Close all windows", func() {
+		OpenWindows -= mw.Supervisor().CloseAllWindows()
+	})
+
+	menu.Supervise(mw.Supervisor())
+	menu.Compute(mw.Engine)
+	mw.Pack(menu, menu.PackTop())
+
+	// Add some windows to play with.
+	addWindow(mw)
+	addWindow(mw)
+
+	mw.SetBackground(render.White)
+
+	mw.OnLoop(func(e *event.State) {
+		if e.Escape {
+			os.Exit(0)
+		}
+	})
+
+	mw.MainLoop()
+}
+
+// Add a new child window.
+func addWindow(mw *ui.MainWindow) {
+	var (
+		color = WindowColors[WindowID%len(WindowColors)]
+		title = fmt.Sprintf("Window %d (%s)", WindowID+1, ui.Theme.Name)
+	)
+	WindowID++
+
+	win1 := ui.NewWindow(title)
+	win1.SetButtons(ui.CloseButton)
+	win1.ActiveTitleBackground = color
+	win1.InactiveTitleBackground = color.Darken(60)
+	win1.InactiveTitleForeground = render.Grey
+	win1.Configure(ui.Config{
+		Width:  320,
+		Height: 240,
+	})
+	win1.Compute(mw.Engine)
+	win1.Supervise(mw.Supervisor())
+
+	// Re-open a window when the last one is closed.
+	OpenWindows++
+	win1.Handle(ui.CloseWindow, func(ed ui.EventData) error {
+		OpenWindows--
+		if OpenWindows <= 0 {
+			addWindow(mw)
+		}
+		return nil
+	})
+
+	// Default placement via cascade.
+	win1.MoveTo(Cascade)
+	Cascade.Add(CascadeStep)
+	if Cascade.Y > Height-240-64 {
+		CascadeLoops++
+		Cascade.Y = 32
+		Cascade.X = 24 * CascadeLoops
+	}
+
+	// Add the TabFrame.
+	tabframe := MakeTabFrame(mw)
+	win1.Pack(tabframe, ui.Pack{
+		Side:   ui.W,
+		Expand: true,
+	})
+
+	// Add a window duplicator button.
+	btn2 := ui.NewButton(title+":Button2", ui.NewLabel(ui.Label{
+		Text: "New Window",
+	}))
+	btn2.Handle(ui.Click, func(ed ui.EventData) error {
+		addWindow(mw)
+		return nil
+	})
+	btn2.Compute(mw.Engine)
+	mw.Add(btn2)
+	win1.Compute(mw.Engine)
+	win1.Place(btn2, ui.Place{
+		Bottom: 12,
+		Right:  12,
+	})
+}
--- a/eg/tabframe/screenshot.png
+++ b/eg/tabframe/screenshot.png
--- a/frame_place.go
+++ b/frame_place.go
@ -54,6 +54,8 @@ func (w *Frame) Place(child Widget, config Place) {
 func (w *Frame) computePlaced(e render.Engine) {
 	var (
 		frameSize = w.BoxSize()
+		// maxWidth int
+		// maxHeight int
 	)

 	for _, row := range w.placed {
--- a/go.mod
+++ b/go.mod
@ -1,9 +1,9 @@
 module git.kirsle.net/go/ui

-go 1.13
+go 1.16

 require (
-	git.kirsle.net/go/render v0.0.0-20210104010442-b4a1979a8ba1
-	github.com/veandco/go-sdl2 v0.4.7 // indirect
-	golang.org/x/image v0.0.0-20210504121937-7319ad40d33e // indirect
+	git.kirsle.net/go/render v0.0.0-20210614025954-d77f5056b782
+	github.com/veandco/go-sdl2 v0.4.8 // indirect
+	golang.org/x/image v0.0.0-20210628002857-a66eb6448b8d
 )
--- a/go.sum
+++ b/go.sum
@ -1,166 +1,17 @@
-cloud.google.com/go v0.26.0/go.mod h1:aQUYkXzVsufM+DwF1aE+0xfcU+56JwCaLick0ClmMTw=
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-git.kirsle.net/go/render v0.0.0-20200102014411-4d008b5c468d h1:vErak6oVRT2dosyQzcwkjXyWQ2NRIVL8q9R8NOUTtsg=
-git.kirsle.net/go/render v0.0.0-20200102014411-4d008b5c468d/go.mod h1:ywZtC+zE2SpeObfkw0OvG01pWHQadsVQ4WDKOYzaejc=
 git.kirsle.net/go/render v0.0.0-20210104010442-b4a1979a8ba1 h1:wGQLjBnWvqx7rU43yFG8ow4rnYqUMUwqorEkxdPaJ6Q=
 git.kirsle.net/go/render v0.0.0-20210104010442-b4a1979a8ba1/go.mod h1:ss7pvZbGWrMaDuZwyUTjV9+T0AJwAkxZZHwMFsvHrkk=
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-honnef.co/go/tools v0.0.0-20180728063816-88497007e858/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.0-20190102054323-c2f93a96b099/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
-honnef.co/go/tools v0.0.0-20190106161140-3f1c8253044a/go.mod h1:rf3lG4BRIbNafJWhAfAdb/ePZxsR/4RtNHQocxwk9r4=
+golang.org/x/text v0.3.6/go.mod h1:5Zoc/QRtKVWzQhOtBMvqHzDpF6irO9z98xDceosuGiQ=
+golang.org/x/tools v0.0.0-20180917221912-90fa682c2a6e/go.mod h1:n7NCudcB/nEzxVGmLbDWY5pfWTLqBcC2KZ6jyYvM4mQ=
--- a/tabframe.go
+++ b/tabframe.go
@ -0,0 +1,282 @@
+package ui
+
+import (
+	"fmt"
+
+	"git.kirsle.net/go/render"
+	"git.kirsle.net/go/ui/style"
+	"git.kirsle.net/go/ui/theme"
+)
+
+// TabFrame is a tabbed notebook of multiple frames showing
+// tab names along the top and clicking them reveals each
+// named tab.
+type TabFrame struct {
+	Name string
+	Frame
+
+	supervisor *Supervisor
+	style      *style.Button
+
+	// Child widgets.
+	header        *Frame
+	content       *Frame
+	tabButtons    []*Button
+	tabFrames     []*Frame
+	currentTabKey string
+}
+
+// NewTabFrame creates a new Frame.
+func NewTabFrame(name string) *TabFrame {
+	w := &TabFrame{
+		Name:       name,
+		style:      Theme.TabFrame,
+		header:     NewFrame(name + " Header"),
+		content:    NewFrame(name + " Content"),
+		tabButtons: []*Button{},
+		tabFrames:  []*Frame{},
+	}
+
+	// Initialize the root frame of this widget.
+	w.Frame.Setup()
+
+	// Pack the high-level layout into the root frame.
+	// Only root needs to Present for this widget.
+	w.Frame.Pack(w.header, Pack{
+		Side:  N,
+		FillX: true,
+	})
+	w.Frame.Pack(w.content, Pack{
+		Side:   N,
+		Fill:   true,
+		Expand: true,
+	})
+
+	w.SetBackground(render.RGBA(1, 0, 0, 0)) // invisible default BG
+	w.IDFunc(func() string {
+		return fmt.Sprintf("TabFrame<%s>",
+			name,
+		)
+	})
+
+	return w
+}
+
+// AddTab creates a new content tab. The key is a unique identifier
+// for the tab and is how the TabFrame knows which tab is selected.
+//
+// The child widget would probably be a Label or Image but could be
+// any other kind of widget.
+//
+// The first tab added becomes the selected tab by default.
+func (w *TabFrame) AddTab(key string, child Widget) *Frame {
+	// Create the tab button for this tab.
+	button := NewButton(key, child)
+	button.SetStyle(w.style)
+	button.FixedColor = true
+	button.SetOutlineSize(0)
+	button.SetBorderSize(1)
+	w.setButtonStyle(button, len(w.tabButtons) == 0)
+	w.header.Pack(button, Pack{
+		Side: W,
+	})
+
+	button.Handle(MouseDown, func(ed EventData) error {
+		w.SetTab(key)
+		return nil
+	})
+
+	// Create the frame of the tab's body.
+	frame := NewFrame(key)
+	frame.Configure(Config{
+		BorderSize:  w.style.BorderSize,
+		Background:  w.style.Background,
+		BorderStyle: BorderRaised,
+	})
+	if len(w.tabFrames) > 0 {
+		frame.Hide()
+	}
+
+	// Pack this frame into the content part of the widget.
+	w.content.Pack(frame, Pack{
+		Side:  N,
+		FillX: true,
+	})
+
+	w.tabButtons = append(w.tabButtons, button)
+	w.tabFrames = append(w.tabFrames, frame)
+	return frame
+}
+
+// set the tab style between active and inactive
+func (w *TabFrame) setButtonStyle(button *Button, active bool) {
+	var style = button.GetStyle()
+	if active {
+		button.SetBackground(style.Background)
+		button.SetBorderStyle(BorderRaised)
+		if label, ok := button.child.(*Label); ok {
+			label.Font.Color = style.Foreground
+		}
+	} else {
+		button.SetBackground(style.Background.Darken(theme.BorderColorOffset))
+		button.SetBorderStyle(BorderSolid)
+		if label, ok := button.child.(*Label); ok {
+			label.Font.Color = style.Foreground
+		}
+	}
+}
+
+// SetTab changes the selected tab to the new value. If the
+// tab doesn't exist, the first tab is selected.
+func (w *TabFrame) SetTab(key string) bool {
+	var found bool
+	for i, frame := range w.tabFrames {
+		button := w.tabButtons[i]
+		if frame.Name == key {
+			frame.Show()
+			w.setButtonStyle(button, true)
+			w.currentTabKey = key
+			found = true
+		} else {
+			frame.Hide()
+			w.setButtonStyle(button, false)
+		}
+	}
+
+	if !found && len(w.tabFrames) > 0 {
+		w.tabFrames[0].Show()
+		w.currentTabKey = w.tabFrames[0].Name
+	}
+
+	return found
+}
+
+// Supervise activates the tab frame using your supervisor. If you
+// don't call this, the tab buttons won't be clickable!
+//
+// Call this AFTER adding all tabs. This function calls Supervisor.Add
+// on all tab buttons.
+func (w *TabFrame) Supervise(supervisor *Supervisor) {
+	for _, button := range w.tabButtons {
+		supervisor.Add(button)
+	}
+}
+
+// SetStyle controls the visual styling of the tab button bar.
+func (w *TabFrame) SetStyle(style *style.Button) {
+	w.style = style
+	for _, button := range w.tabButtons {
+		button.SetStyle(style)
+		w.setButtonStyle(button, !button.Hidden())
+	}
+}
+
+// Compute the size of the Frame.
+func (w *TabFrame) Compute(e render.Engine) {
+	// Compute all the child frames.
+	w.Frame.Compute(e)
+
+	// Call the BaseWidget Compute in case we have subscribers.
+	w.BaseWidget.Compute(e)
+}
+
+// Present the Frame.
+func (w *TabFrame) Present(e render.Engine, P render.Point) {
+	if w.Hidden() {
+		return
+	}
+
+	var (
+		S = w.Size()
+	)
+
+	// Draw the widget's border and everything.
+	w.DrawBox(e, P)
+
+	// Draw the background color.
+	e.DrawBox(w.Background(), render.Rect{
+		X: P.X + w.BoxThickness(1),
+		Y: P.Y + w.BoxThickness(1),
+		W: S.W - w.BoxThickness(2),
+		H: S.H - w.BoxThickness(2),
+	})
+
+	// Present the root frame.
+	w.Frame.Present(e, P)
+
+	// Draw the borders over the tabs.
+	w.presentBorders(e, P)
+
+	// Call the BaseWidget Present in case we have subscribers.
+	w.BaseWidget.Present(e, P)
+}
+
+/*
+presentBorders handles drawing the borders around tab buttons.
+
+The tabs are simple Button widgets but drawn with no borders. Instead,
+borders are painted on post-hoc in the Present function.
+*/
+func (w *TabFrame) presentBorders(e render.Engine, P render.Point) {
+	if len(w.tabButtons) == 0 {
+		return
+	}
+
+	// Prep some variables.
+	var (
+		// The 1st and last tab button widgets.
+		first       = w.tabButtons[0]
+		last        = w.tabButtons[len(w.tabButtons)-1]
+		topLeft     = AbsolutePosition(first)
+		bottomRight = AbsolutePosition(last)
+
+		// The absolute bounding box of the tabs part of the UI,
+		// from the top-left corner of Tab #1 to the bottom-right
+		// corner of the final tab.
+		bounding = render.Rect{
+			X: P.X, //topLeft.X + first.BoxThickness(4),
+			Y: P.Y, //topLeft.Y + first.BoxThickness(4),
+			W: bottomRight.X + last.Size().W - topLeft.X,
+			H: bottomRight.Y + last.Size().H - topLeft.Y,
+		}
+
+		// The very bottom edge of the whole tab bar,
+		// to overlap the BorderSize=1 along their buttons.
+		bottomLine = []render.Point{
+			render.NewPoint(P.X+1, bounding.Y+bounding.H-1),
+			render.NewPoint(bounding.X+bounding.W-1, bounding.Y+bounding.H-1),
+		}
+	)
+
+	// Draw a shadow border on all the inactive tabs' right edges,
+	// so they don't all blend together in solid grey.
+	// Note: the active button has a BorderSize=1 and others are 0.
+	for i, button := range w.tabButtons {
+		if button.Name != w.currentTabKey {
+			// If it immediately precedes the current tab, do not draw the line,
+			// it would cover the highlight color of the current tab's button.
+			if i+1 < len(w.tabButtons) && w.tabButtons[i+1].Name == w.currentTabKey {
+				continue
+			}
+
+			var (
+				abs    = AbsolutePosition(button)
+				size   = button.BoxSize()
+				points = []render.Point{
+					render.NewPoint(abs.X+size.W-1, abs.Y+2),
+					render.NewPoint(abs.X+size.W-1, abs.Y+size.H-2),
+				}
+			)
+			e.DrawLine(button.Background().Darken(theme.BorderColorOffset), points[0], points[1])
+		}
+	}
+
+	// Erase the button edge from all tabs.
+	e.DrawLine(w.style.Background, bottomLine[0], bottomLine[1])
+	e.DrawBox(w.style.Background, render.Rect{
+		X: bottomLine[0].X + 1,
+		Y: bottomLine[0].Y,
+		W: bounding.W - 2,
+		H: 3,
+	})
+}
--- a/theme/theme.go
+++ b/theme/theme.go
@ -17,19 +17,21 @@ var (

 // Theme is a collection of styles for various built-in widgets.
 type Theme struct {
-	Name    string
-	Window  *style.Window
-	Label   *style.Label
-	Button  *style.Button
-	Tooltip *style.Tooltip
+	Name     string
+	Window   *style.Window
+	Label    *style.Label
+	Button   *style.Button
+	Tooltip  *style.Tooltip
+	TabFrame *style.Button
 }

 // Default theme.
 var Default = Theme{
-	Name:    "Default",
-	Label:   &style.DefaultLabel,
-	Button:  &style.DefaultButton,
-	Tooltip: &style.DefaultTooltip,
+	Name:     "Default",
+	Label:    &style.DefaultLabel,
+	Button:   &style.DefaultButton,
+	Tooltip:  &style.DefaultTooltip,
+	TabFrame: &style.DefaultButton,
 }

 // DefaultFlat is a flat version of the default theme.
@ -45,6 +47,16 @@ var DefaultFlat = Theme{
 		BorderStyle:     style.BorderSolid,
 		BorderSize:      2,
 	},
+	TabFrame: &style.Button{
+		Background:      style.DefaultButton.Background,
+		Foreground:      style.DefaultButton.Foreground,
+		OutlineColor:    style.DefaultButton.OutlineColor,
+		OutlineSize:     1,
+		HoverBackground: style.DefaultButton.HoverBackground,
+		HoverForeground: style.DefaultButton.HoverForeground,
+		BorderStyle:     style.BorderSolid,
+		BorderSize:      2,
+	},
 }

 // DefaultDark is a dark version of the default theme.
@ -74,4 +86,13 @@ var DefaultDark = Theme{
 		Background: render.RGBA(60, 60, 60, 230),
 		Foreground: render.Cyan,
 	},
+	TabFrame: &style.Button{
+		Background:      render.DarkGrey,
+		Foreground:      render.Grey,
+		OutlineColor:    render.DarkGrey,
+		OutlineSize:     1,
+		HoverBackground: render.Grey,
+		BorderStyle:     style.BorderRaised,
+		BorderSize:      2,
+	},
 }
--- a/window.go
+++ b/window.go
@ -341,7 +341,7 @@ func (w *Window) Pack(child Widget, config ...Pack) {

 // Place a child widget into the window's main frame.
 func (w *Window) Place(child Widget, config Place) {
-	w.content.Place(child, config)
+	w.body.Place(child, config)
 }

 // TitleBar returns the title bar widgets.
@ -356,6 +356,14 @@ func (w *Window) Configure(C Config) {
 	w.body.Configure(C)

 	// Don't pass dimensions down any further than the body.
+	// TODO: this causes the content frame to compute its size
+	// dynamically based on Packed widgets, but if using Place on
+	// your window, the content frame doesn't know a size by which
+	// to place the child relative to (Frame has size 0x0).
+	// Commenting out these two lines causes windows to render very
+	// incorrectly (child frame content flying off the window bottom).
+	// In the meantime, Window.Place intercepts it and draws it onto
+	// the parent window directly so it works how you expect.
 	C.Width = 0
 	C.Height = 0
 	w.content.Configure(C)
@ -366,6 +374,11 @@ func (w *Window) ConfigureTitle(C Config) {
 	w.titleBar.Configure(C)
 }

+// ContentFrame returns the main content Frame of this window.
+func (w *Window) ContentFrame() *Frame {
+	return w.content
+}
+
 // Compute the window.
 func (w *Window) Compute(e render.Engine) {
 	w.engine = e // hang onto it in case of maximize