Upgrade objects, x

README.md

@@ -1,4 +1,6 @@
 # nasin
 
+[![Go Reference](https://pkg.go.dev/badge/git.tebibyte.media/tomo/nasin.svg)](https://pkg.go.dev/git.tebibyte.media/tomo/nasin)
+
 Nasin provides an easy way to write applications with Tomo. Parts of Tomo that
 aren't the GUI toolkit may be found here.

application.go

@@ -1,7 +1,9 @@
 package nasin
 
+import "log"
 import "image"
 import "git.tebibyte.media/tomo/tomo"
+import "git.tebibyte.media/tomo/nasin/internal/registrar"
 
 // Application represents an application object.
 type Application interface {
@@ -9,7 +11,7 @@ type Application interface {
 	Describe () ApplicationDescription
 
 	// Init performs the initial setup of the application.
-	Init ()
+	Init () error
 }
 
 // ApplicationDescription describes the name and type of an application.
@@ -74,9 +76,16 @@ type ApplicationRole string; const (
 	RoleChecklist         ApplicationRole = "Checklist"
 )
 
-// RunApplication is like Run, but runs an application.
-func RunApplication (application Application) error {
-	return tomo.Run(application.Init)
+// RunApplication is like tomo.Run, but runs an application. If something fails
+// to initialize, an error is written to the standard logger.
+func RunApplication (application Application) {
+	err := registrar.Init()
+	if err != nil { log.Fatal("nasin: could not init registry:", err) }
+	err = tomo.Run(func () {
+		err := application.Init()
+		if err != nil { log.Fatal("nasin: could not run application:", err) }
+	})
+	if err != nil { log.Fatal("nasin: could not run application:", err) }
 }
 
 // NewApplicationWindow creates a window for an application. It will

backend.go

@@ -1,8 +0,0 @@
-package nasin
-
-import "git.tebibyte.media/tomo/x"
-import "git.tebibyte.media/tomo/tomo"
-
-func init () {
-	tomo.Register(1, x.NewBackend)
-}

examples/clock/main.go

@@ -0,0 +1,126 @@
+// Example clock demonstrates the use of goroutines and tomo.Do() to provide
+// live-updating information.
+package main
+
+import "time"
+import "math"
+import "image"
+import "image/color"
+import "git.tebibyte.media/tomo/tomo"
+import "git.tebibyte.media/tomo/nasin"
+import "git.tebibyte.media/tomo/objects"
+import "git.tebibyte.media/tomo/tomo/theme"
+import "git.tebibyte.media/tomo/tomo/canvas"
+import "git.tebibyte.media/tomo/objects/layouts"
+
+type Application struct {
+	clockFace *ClockFace
+	timeLabel *objects.Label
+}
+
+func (this *Application) Describe () nasin.ApplicationDescription {
+	return nasin.ApplicationDescription {
+		Name: "Clock",
+		ID:   "xyz.holanet.TomoClockExample",
+	}
+}
+
+func (this *Application) Init () error {
+	window, err := nasin.NewApplicationWindow(this, image.Rect(0, 0, 128, 160))
+	if err != nil { return err }
+
+	this.clockFace = NewClockFace()
+	this.timeLabel = objects.NewLabel("")
+	this.timeLabel.SetAlign(tomo.AlignMiddle, tomo.AlignMiddle)
+	container := objects.NewOuterContainer (
+		layouts.NewGrid([]bool { true }, []bool { true, false }),
+		this.clockFace,
+		this.timeLabel)
+	window.SetRoot(container)
+
+	go func () {
+		for {
+			tomo.Do(this.updateTime)
+			time.Sleep(time.Second)
+		}
+	} ()
+
+	window.OnClose(tomo.Stop)
+	window.Show()
+	return nil
+}
+
+func (this *Application) updateTime () {
+	now := time.Now()
+	this.clockFace.SetTime(now)
+	this.timeLabel.SetText(now.Format(time.DateTime))
+}
+
+func main () {
+	nasin.RunApplication(&Application { })
+}
+
+type ClockFace struct {
+	tomo.CanvasBox
+	time time.Time
+}
+
+func NewClockFace () *ClockFace {
+	box := &ClockFace {
+		CanvasBox: tomo.NewCanvasBox(),
+	}
+	theme.Apply(box, theme.R("nasin", "ClockFace", ""))
+	box.SetDrawer(box)
+	return box
+}
+
+// TODO move ClockFace to objects
+
+func (this *ClockFace) SetTime (when time.Time) {
+	this.time = when
+	this.Invalidate()
+}
+
+func (this *ClockFace) Draw (destination canvas.Canvas) {
+	pen := destination.Pen()
+	pen.Fill(color.Transparent)
+	pen.Rectangle(destination.Bounds())
+
+	for hour := 0; hour < 12; hour ++ {
+		radialLine (
+			destination,
+			theme.ColorForeground,
+			0.8, 0.9, float64(hour) / 6 * math.Pi)
+	}
+
+	second := float64(this.time.Second())
+	minute := float64(this.time.Minute()) + second / 60
+	hour   := float64(this.time.Hour())   + minute / 60
+
+	radialLine(destination, theme.ColorForeground, 0, 0.5, (hour   - 3)  / 6  * math.Pi)
+	radialLine(destination, theme.ColorForeground, 0, 0.7, (minute - 15) / 30 * math.Pi)
+	radialLine(destination, theme.ColorAccent,     0, 0.7, (second - 15) / 30 * math.Pi)
+}
+
+func radialLine (
+	destination canvas.Canvas,
+	source color.Color,
+	inner  float64,
+	outer  float64,
+	theta  float64,
+) {
+	pen := destination.Pen()
+	bounds := destination.Bounds()
+	width  := float64(bounds.Dx()) / 2
+	height := float64(bounds.Dy()) / 2
+	min := bounds.Min.Add(image.Pt (
+		int(math.Cos(theta) * inner * width + width),
+		int(math.Sin(theta) * inner * height + height)))
+	max := bounds.Min.Add(image.Pt (
+		int(math.Cos(theta) * outer * width + width),
+		int(math.Sin(theta) * outer * height + height)))
+	
+	pen.Stroke(source)
+	pen.StrokeWeight(1)
+	pen.Path(min, max)
+}

examples/icons/main.go

@@ -0,0 +1,199 @@
+// Example icons demonstrates the use of icons, and buttons with icons.
+package main
+
+import "image"
+import "git.tebibyte.media/tomo/tomo"
+import "git.tebibyte.media/tomo/nasin"
+import "git.tebibyte.media/tomo/objects"
+import "git.tebibyte.media/tomo/tomo/theme"
+import "git.tebibyte.media/tomo/objects/layouts"
+
+const scrollIcons = false
+
+type Application struct {
+	size theme.IconSize
+	grid tomo.ContainerBox
+}
+
+func (this *Application) Describe () nasin.ApplicationDescription {
+	return nasin.ApplicationDescription {
+		Name: "Tomo Icon Example",
+		ID:   "xyz.holanet.TomoIconExample",
+	}
+}
+
+func (this *Application) Init () error {
+	window, err := nasin.NewApplicationWindow(this, image.Rect(0, 0, 128, 128))
+	if err != nil { return err }
+
+	this.grid = objects.NewInnerContainer (
+		layouts.NewGrid([]bool {
+				false, false, false, false, false, false, false, false, false, false, false, false,
+			}, []bool { }),
+	)
+	this.resizeIcons(theme.IconSizeSmall)
+	
+	iconButtons := objects.NewInnerContainer(layouts.NewGrid([]bool { true, true, true}, []bool { false }))
+
+	button := objects.NewButton("small")
+	button.SetIcon(theme.IconActionZoomOut)
+	button.OnClick(func () { this.resizeIcons(theme.IconSizeSmall) })
+	iconButtons.Add(button)
+	
+	button = objects.NewButton("medium")
+	button.SetIcon(theme.IconActionZoomReset)
+	button.OnClick(func () { this.resizeIcons(theme.IconSizeMedium) })
+	iconButtons.Add(button)
+	
+	button = objects.NewButton("large")
+	button.SetIcon(theme.IconActionZoomIn)
+	button.OnClick(func () { this.resizeIcons(theme.IconSizeLarge) })
+	iconButtons.Add(button)
+	
+	container := objects.NewOuterContainer (
+		layouts.NewGrid([]bool { true }, []bool { false, true, false }),
+		objects.NewLabel("A smorgasbord of icons:"))
+	if scrollIcons {
+		iconScroller := objects.NewScrollContainer(objects.ScrollVertical)
+		this.grid.SetOverflow(false, true)
+		iconScroller.SetRoot(this.grid)
+		container.Add(iconScroller)
+	} else {
+		container.Add(this.grid)
+	}
+	container.Add(iconButtons)
+	window.SetRoot(container)
+
+	window.OnClose(tomo.Stop)
+	window.Show()
+	return nil
+}
+
+func (this *Application) resizeIcons (size theme.IconSize) {
+	this.size = size
+	this.grid.Clear()
+	icons := []theme.Icon {
+		theme.IconUnknown,
+		theme.IconFile,
+		theme.IconDirectory,
+		theme.IconStorage,
+		theme.IconApplication,
+		theme.IconNetwork,
+		theme.IconDevice,
+		theme.IconPeripheral,
+		theme.IconPort,
+		theme.IconActionOpen,
+		theme.IconActionOpenIn,
+		theme.IconActionSave,
+		theme.IconActionSaveAs,
+		theme.IconActionPrint,
+		theme.IconActionNew,
+		theme.IconActionNewDirectory,
+		theme.IconActionDelete,
+		theme.IconActionRename,
+		theme.IconActionGetInformation,
+		theme.IconActionChangePermissions,
+		theme.IconActionRevert,
+		theme.IconActionAdd,
+		theme.IconActionRemove,
+		theme.IconActionAddBookmark,
+		theme.IconActionRemoveBookmark,
+		theme.IconActionAddFavorite,
+		theme.IconActionRemoveFavorite,
+		theme.IconActionPlay,
+		theme.IconActionPause,
+		theme.IconActionStop,
+		theme.IconActionFastForward,
+		theme.IconActionRewind,
+		theme.IconActionToBeginning,
+		theme.IconActionToEnd,
+		theme.IconActionRecord,
+		theme.IconActionVolumeUp,
+		theme.IconActionVolumeDown,
+		theme.IconActionMute,
+		theme.IconActionUndo,
+		theme.IconActionRedo,
+		theme.IconActionCut,
+		theme.IconActionCopy,
+		theme.IconActionPaste,
+		theme.IconActionFind,
+		theme.IconActionReplace,
+		theme.IconActionSelectAll,
+		theme.IconActionSelectNone,
+		theme.IconActionIncrement,
+		theme.IconActionDecrement,
+		theme.IconActionClose,
+		theme.IconActionQuit,
+		theme.IconActionIconify,
+		theme.IconActionShade,
+		theme.IconActionMaximize,
+		theme.IconActionFullScreen,
+		theme.IconActionRestore,
+		theme.IconActionExpand,
+		theme.IconActionContract,
+		theme.IconActionBack,
+		theme.IconActionForward,
+		theme.IconActionUp,
+		theme.IconActionDown,
+		theme.IconActionReload,
+		theme.IconActionZoomIn,
+		theme.IconActionZoomOut,
+		theme.IconActionZoomReset,
+		theme.IconActionMove,
+		theme.IconActionResize,
+		theme.IconActionGoTo,
+		theme.IconActionTransform,
+		theme.IconActionTranslate,
+		theme.IconActionRotate,
+		theme.IconActionScale,
+		theme.IconActionWarp,
+		theme.IconActionCornerPin,
+		theme.IconActionSelectRectangle,
+		theme.IconActionSelectEllipse,
+		theme.IconActionSelectLasso,
+		theme.IconActionSelectGeometric,
+		theme.IconActionSelectAuto,
+		theme.IconActionCrop,
+		theme.IconActionFill,
+		theme.IconActionGradient,
+		theme.IconActionPencil,
+		theme.IconActionBrush,
+		theme.IconActionEraser,
+		theme.IconActionText,
+		theme.IconActionEyedropper,
+		theme.IconStatusInformation,
+		theme.IconStatusQuestion,
+		theme.IconStatusWarning,
+		theme.IconStatusError,
+		theme.IconStatusCancel,
+		theme.IconStatusOkay,
+		theme.IconStatusCellSignal0,
+		theme.IconStatusCellSignal1,
+		theme.IconStatusCellSignal2,
+		theme.IconStatusCellSignal3,
+		theme.IconStatusWirelessSignal0,
+		theme.IconStatusWirelessSignal1,
+		theme.IconStatusWirelessSignal2,
+		theme.IconStatusWirelessSignal3,
+		theme.IconStatusBattery0,
+		theme.IconStatusBattery1,
+		theme.IconStatusBattery2,
+		theme.IconStatusBattery3,
+		theme.IconStatusBrightness0,
+		theme.IconStatusBrightness1,
+		theme.IconStatusBrightness2,
+		theme.IconStatusBrightness3,
+		theme.IconStatusVolume0,
+		theme.IconStatusVolume1,
+		theme.IconStatusVolume2,
+		theme.IconStatusVolume3,
+	}
+
+	for _, icon := range icons {
+		this.grid.Add(objects.NewIcon(icon, size))
+	}
+}
+
+func main () {
+	nasin.RunApplication(&Application { })
+}

examples/inputs/main.go

@@ -0,0 +1,38 @@
+// Example inputs demonstrates the use of various user input methods.
+package main
+
+import "image"
+import "git.tebibyte.media/tomo/tomo"
+import "git.tebibyte.media/tomo/nasin"
+import "git.tebibyte.media/tomo/objects"
+// import "git.tebibyte.media/tomo/tomo/theme"
+import "git.tebibyte.media/tomo/objects/layouts"
+
+type Application struct { }
+
+func (this *Application) Describe () nasin.ApplicationDescription {
+	return nasin.ApplicationDescription {
+		Name: "Tomo Input Example",
+		ID:   "xyz.holanet.TomoInputExample",
+	}
+}
+
+func (this *Application) Init () error {
+	window, err := nasin.NewApplicationWindow(this, image.Rect(0, 0, 128, 128))
+	if err != nil { return err }
+
+	window.SetRoot(objects.NewOuterContainer(layouts.Column { },
+		objects.NewTextInput(""),
+		objects.NewHorizontalSlider(0.5),
+		objects.NewLabelCheckbox(false, "checkbox"),
+		objects.NewNumberInput(5),
+	))
+
+	window.OnClose(tomo.Stop)
+	window.Show()
+	return nil
+}
+
+func main () {
+	nasin.RunApplication(&Application { })
+}

go.mod

@@ -3,17 +3,18 @@ module git.tebibyte.media/tomo/nasin
 go 1.20
 
 require (
-	git.tebibyte.media/tomo/tomo v0.30.0
-	git.tebibyte.media/tomo/x v0.6.0
+	git.tebibyte.media/tomo/objects v0.11.0
+	git.tebibyte.media/tomo/tomo v0.31.0
+	git.tebibyte.media/tomo/x v0.7.3
 	git.tebibyte.media/tomo/xdg v0.1.0
+	golang.org/x/image v0.11.0
 )
 
 require (
-	git.tebibyte.media/tomo/typeset v0.7.0 // indirect
+	git.tebibyte.media/tomo/typeset v0.7.1 // indirect
 	git.tebibyte.media/tomo/xgbkb v1.0.1 // indirect
 	github.com/BurntSushi/freetype-go v0.0.0-20160129220410-b763ddbfe298 // indirect
 	github.com/BurntSushi/graphics-go v0.0.0-20160129215708-b43f31a4a966 // indirect
 	github.com/jezek/xgb v1.1.0 // indirect
 	github.com/jezek/xgbutil v0.0.0-20230603163917-04188eb39cf0 // indirect
-	golang.org/x/image v0.11.0 // indirect
 )

go.sum

@@ -1,10 +1,12 @@
 git.tebibyte.media/sashakoshka/xgbkb v1.0.0/go.mod h1:pNcE6TRO93vHd6q42SdwLSTTj25L0Yzggz7yLe0JV6Q=
-git.tebibyte.media/tomo/tomo v0.30.0 h1:JoTklJ7yFVrzre4AwuKBMwzho9GomC9ySw354wDB4f4=
-git.tebibyte.media/tomo/tomo v0.30.0/go.mod h1:C9EzepS9wjkTJjnZaPBh22YvVPyA4hbBAJVU20Rdmps=
-git.tebibyte.media/tomo/typeset v0.7.0 h1:JFpEuGmN6R2XSCvkINYxpH0AyYUqqs+dZYr6OSd91y0=
-git.tebibyte.media/tomo/typeset v0.7.0/go.mod h1:PwDpSdBF3l/EzoIsa2ME7QffVVajnTHZN6l3MHEGe1g=
-git.tebibyte.media/tomo/x v0.6.0 h1:80BRiSwhZCqu6IPKZoQj7t1puKXXJpMB9eWVHQliTHM=
-git.tebibyte.media/tomo/x v0.6.0/go.mod h1:6INfDGlcPyoYVMem64ScD5AZb43PkXDGkfgaNa5GCqQ=
+git.tebibyte.media/tomo/objects v0.11.0 h1:ESv6/9UtLOX2lJKopQhPNuxd6U6jWOrU1XnHaH+dgv8=
+git.tebibyte.media/tomo/objects v0.11.0/go.mod h1:34UDkPEHxBgIsAYWyqqE4u1KvVtwzwdpCO6AdkgsrKo=
+git.tebibyte.media/tomo/tomo v0.31.0 h1:LHPpj3AWycochnC8F441aaRNS6Tq6w6WnBrp/LGjyhM=
+git.tebibyte.media/tomo/tomo v0.31.0/go.mod h1:C9EzepS9wjkTJjnZaPBh22YvVPyA4hbBAJVU20Rdmps=
+git.tebibyte.media/tomo/typeset v0.7.1 h1:aZrsHwCG5ZB4f5CruRFsxLv5ezJUCFUFsQJJso2sXQ8=
+git.tebibyte.media/tomo/typeset v0.7.1/go.mod h1:PwDpSdBF3l/EzoIsa2ME7QffVVajnTHZN6l3MHEGe1g=
+git.tebibyte.media/tomo/x v0.7.3 h1:9sjjYC7UMsrce6GsWdP/Jb2U6UEE3st4WiUvz9RhycI=
+git.tebibyte.media/tomo/x v0.7.3/go.mod h1:8BLhXlFSTmn/y2FM+yrc6yLmMzqMhFQYYrN9SXMbmZM=
 git.tebibyte.media/tomo/xdg v0.1.0 h1:6G2WYPPiM2IXleCpKKHuJA34BxumwNWuLsUoX3yu5zA=
 git.tebibyte.media/tomo/xdg v0.1.0/go.mod h1:tuaRwRkyYW7mqlxA7P2+V+e10KzcamNoUzcOgaIYKAY=
 git.tebibyte.media/tomo/xgbkb v1.0.1 h1:b3HDUopjdQp1MZrb5Vpil4bOtk3NnNXtfQW27Blw2kE=

internal/registrar/doc.go

@@ -0,0 +1,2 @@
+// Package registrar provides platform-dependent components at compile time.
+package registrar

internal/registrar/registrar_unix.go

@@ -0,0 +1,13 @@
+//go:build unix && (!darwin)
+package registrar
+
+import "git.tebibyte.media/tomo/x"
+import "git.tebibyte.media/tomo/tomo"
+import "git.tebibyte.media/tomo/tomo/theme"
+import "git.tebibyte.media/tomo/nasin/internal/theme/default"
+
+func Init () error {
+	theme.SetTheme(defaultTheme.Theme())
+	tomo.Register(1, x.NewBackend)
+	return nil
+}

internal/theme/attribute.go

@@ -0,0 +1,41 @@
+package theme
+
+import "image"
+import "image/color"
+import "golang.org/x/image/font"
+import "git.tebibyte.media/tomo/tomo"
+
+// Attr modifies one thing about an Objects's style.
+type Attr interface { attr () int }
+
+// AttrColor sets the background color of an Objects.
+type AttrColor struct { color.Color }
+// AttrTexture sets the texture of an Objects to a named texture.
+type AttrTexture string
+// AttrBorder sets the border of an Objects.
+type AttrBorder []tomo.Border
+// AttrMinimumSize sets the minimum size of an Objects.
+type AttrMinimumSize image.Point
+// AttrPadding sets the inner padding of an Objects.
+type AttrPadding tomo.Inset
+// AttrGap sets the gap between child Objects, if the Object is a ContainerBox.
+type AttrGap image.Point
+// AttrTextColor sets the text color, if the Object is a TextBox.
+type AttrTextColor struct { color.Color }
+// AttrDotColor sets the text selection color, if the Object is a TextBox.
+type AttrDotColor struct { color.Color }
+// AttrFace sets the font face, if the Object is a TextBox.
+type AttrFace struct { font.Face }
+// AttrAlign sets the alignment, if the Object is a ContentBox.
+type AttrAlign struct { X, Y tomo.Align }
+
+func (AttrColor)       attr () int { return 0 }
+func (AttrTexture)     attr () int { return 1 }
+func (AttrBorder)      attr () int { return 2 }
+func (AttrMinimumSize) attr () int { return 3 }
+func (AttrPadding)     attr () int { return 4 }
+func (AttrGap)         attr () int { return 5 }
+func (AttrTextColor)   attr () int { return 6 }
+func (AttrDotColor)    attr () int { return 7 }
+func (AttrFace)        attr () int { return 8 }
+func (AttrAlign)       attr () int { return 9 }

internal/theme/default/default.go

@@ -0,0 +1,21 @@
+package defaultTheme
+
+import "image/color"
+import "git.tebibyte.media/tomo/tomo/theme"
+import dataTheme "git.tebibyte.media/tomo/nasin/internal/theme"
+
+// Theme returns Wintergreen, the default Tomo theme. It is neutral-gray with
+// green and turquoise accents.
+func Theme () theme.Theme {
+	return &dataTheme.Theme {
+		Colors: map[theme.Color] color.Color {
+			theme.ColorBackground: colorBackground,
+			theme.ColorForeground: colorForeground,
+			theme.ColorRaised:     colorCarved,
+			theme.ColorSunken:     colorCarved,
+			theme.ColorAccent:     colorFocus,
+		},
+		Rules: rules,
+		IconTheme: &iconTheme { },
+	}
+}

internal/theme/default/icon.go

@@ -0,0 +1,228 @@
+package defaultTheme
+
+import "bytes"
+import "image"
+import _ "embed"
+import _ "image/png"
+import "git.tebibyte.media/tomo/tomo"
+import "git.tebibyte.media/tomo/tomo/data"
+import "git.tebibyte.media/tomo/tomo/theme"
+import "git.tebibyte.media/tomo/tomo/canvas"
+
+//go:embed assets/icons-small.png
+var atlasSmallBytes []byte
+//go:embed assets/icons-large.png
+var atlasLargeBytes []byte
+
+func generateSource (data []byte, width int) map[theme.Icon] canvas.Texture {
+	atlasImage, _, err := image.Decode(bytes.NewReader(data))
+	if err != nil { panic(err) }
+	atlasTexture := tomo.NewTexture(atlasImage)
+
+	source := make(map[theme.Icon] canvas.Texture)
+	x := 0
+	y := 0
+	
+	row := func () {
+		x = 0
+		y ++
+	}
+	col := func (id theme.Icon) {
+		source[id] = atlasTexture.Clip(image.Rect (
+			x * width,
+			y * width,
+			(x + 1) * width,
+			(y + 1) * width))
+		x++
+	}
+
+	// objects
+	col(theme.IconUnknown)
+	col(theme.IconFile)
+	col(theme.IconDirectory)
+	col(theme.IconStorage)
+	col(theme.IconApplication)
+	col(theme.IconNetwork)
+	col(theme.IconDevice)
+	col(theme.IconPeripheral)
+	col(theme.IconPort)
+
+	// actions: files
+	row()
+	col(theme.IconActionOpen)
+	col(theme.IconActionOpenIn)
+	col(theme.IconActionSave)
+	col(theme.IconActionSaveAs)
+	col(theme.IconActionPrint)
+	col(theme.IconActionNew)
+	col(theme.IconActionNewDirectory)
+	col(theme.IconActionDelete)
+	col(theme.IconActionRename)
+	col(theme.IconActionGetInformation)
+	col(theme.IconActionChangePermissions)
+	col(theme.IconActionRevert)
+
+	// actions: list management
+	row()
+	col(theme.IconActionAdd)
+	col(theme.IconActionRemove)
+	col(theme.IconActionAddBookmark)
+	col(theme.IconActionRemoveBookmark)
+	col(theme.IconActionAddFavorite)
+	col(theme.IconActionRemoveFavorite)
+
+	// actions: media
+	row()
+	col(theme.IconActionPlay)
+	col(theme.IconActionPause)
+	col(theme.IconActionStop)
+	col(theme.IconActionFastForward)
+	col(theme.IconActionRewind)
+	col(theme.IconActionToBeginning)
+	col(theme.IconActionToEnd)
+	col(theme.IconActionRecord)
+	col(theme.IconActionVolumeUp)
+	col(theme.IconActionVolumeDown)
+	col(theme.IconActionMute)
+
+	// actions: editing
+	row()
+	col(theme.IconActionUndo)
+	col(theme.IconActionRedo)
+	col(theme.IconActionCut)
+	col(theme.IconActionCopy)
+	col(theme.IconActionPaste)
+	col(theme.IconActionFind)
+	col(theme.IconActionReplace)
+	col(theme.IconActionSelectAll)
+	col(theme.IconActionSelectNone)
+	col(theme.IconActionIncrement)
+	col(theme.IconActionDecrement)
+	
+	// actions: window management
+	row()
+	col(theme.IconActionClose)
+	col(theme.IconActionQuit)
+	col(theme.IconActionIconify)
+	col(theme.IconActionShade)
+	col(theme.IconActionMaximize)
+	col(theme.IconActionFullScreen)
+	col(theme.IconActionRestore)
+
+	// actions: view
+	row()
+	col(theme.IconActionExpand)
+	col(theme.IconActionContract)
+	col(theme.IconActionBack)
+	col(theme.IconActionForward)
+	col(theme.IconActionUp)
+	col(theme.IconActionDown)
+	col(theme.IconActionReload)
+	col(theme.IconActionZoomIn)
+	col(theme.IconActionZoomOut)
+	col(theme.IconActionZoomReset)
+	col(theme.IconActionMove)
+	col(theme.IconActionResize)
+	col(theme.IconActionGoTo)
+
+	// actions: tools
+	row()
+	col(theme.IconActionTransform)
+	col(theme.IconActionTranslate)
+	col(theme.IconActionRotate)
+	col(theme.IconActionScale)
+	col(theme.IconActionWarp)
+	col(theme.IconActionCornerPin)
+	col(theme.IconActionSelectRectangle)
+	col(theme.IconActionSelectEllipse)
+	col(theme.IconActionSelectLasso)
+	col(theme.IconActionSelectGeometric)
+	col(theme.IconActionSelectAuto)
+	col(theme.IconActionCrop)
+	col(theme.IconActionFill)
+	row()
+	col(theme.IconActionGradient)
+	col(theme.IconActionPencil)
+	col(theme.IconActionBrush)
+	col(theme.IconActionEraser)
+	col(theme.IconActionText)
+	col(theme.IconActionEyedropper)
+
+	// status: dialog
+	row()
+	col(theme.IconStatusInformation)
+	col(theme.IconStatusQuestion)
+	col(theme.IconStatusWarning)
+	col(theme.IconStatusError)
+	col(theme.IconStatusCancel)
+	col(theme.IconStatusOkay)
+
+	// status: network
+	row()
+	col(theme.IconStatusCellSignal0)
+	col(theme.IconStatusCellSignal1)
+	col(theme.IconStatusCellSignal2)
+	col(theme.IconStatusCellSignal3)
+	col(theme.IconStatusWirelessSignal0)
+	col(theme.IconStatusWirelessSignal1)
+	col(theme.IconStatusWirelessSignal2)
+	col(theme.IconStatusWirelessSignal3)
+
+	// status: power
+	row()
+	col(theme.IconStatusBattery0)
+	col(theme.IconStatusBattery1)
+	col(theme.IconStatusBattery2)
+	col(theme.IconStatusBattery3)
+	col(theme.IconStatusBrightness0)
+	col(theme.IconStatusBrightness1)
+	col(theme.IconStatusBrightness2)
+	col(theme.IconStatusBrightness3)
+
+	// status: media
+	row()
+	col(theme.IconStatusVolume0)
+	col(theme.IconStatusVolume1)
+	col(theme.IconStatusVolume2)
+	col(theme.IconStatusVolume3)
+
+	return source
+}
+
+type iconTheme struct {
+	texturesSmall map[theme.Icon] canvas.Texture
+	texturesLarge map[theme.Icon] canvas.Texture
+}
+
+func (this *iconTheme) ensure () {
+	if this.texturesSmall != nil { return }
+	this.texturesSmall = generateSource(atlasSmallBytes, 16)
+	this.texturesLarge = generateSource(atlasLargeBytes, 32)
+}
+
+func (this *iconTheme) selectSource (size theme.IconSize) map[theme.Icon] canvas.Texture {
+	if size == theme.IconSizeSmall {
+		return this.texturesSmall
+	} else {
+		return this.texturesLarge
+	}
+}
+
+func (this *iconTheme) Icon (icon theme.Icon, size theme.IconSize) canvas.Texture {
+	this.ensure()
+	source := this.selectSource(size)
+	if texture, ok := source[icon]; ok {
+		return texture
+	}
+	return source[theme.IconUnknown]
+}
+
+func (this *iconTheme) MimeIcon (mime data.Mime, size theme.IconSize) canvas.Texture {
+	this.ensure()
+	source := this.selectSource(size)
+	if mime == data.M("inode", "directory") {
+		return source[theme.IconDirectory]
+	} else {
+		return source[theme.IconFile]
+	}
+}

internal/theme/default/style.go

@@ -0,0 +1,251 @@
+package defaultTheme
+
+import "image/color"
+import "git.tebibyte.media/tomo/tomo"
+import "golang.org/x/image/font/basicfont"
+import "git.tebibyte.media/tomo/tomo/theme"
+import dataTheme "git.tebibyte.media/tomo/nasin/internal/theme"
+
+var colorFocus         = color.RGBA { R:  61, G: 128, B: 143, A: 255 }
+var colorInput         = color.RGBA { R: 208, G: 203, B: 150, A: 255 }
+var colorCarved        = color.RGBA { R: 151, G: 160, B: 150, A: 255 }
+var colorGutter        = color.RGBA { R: 116, G: 132, B: 126, A: 255 }
+var colorShadow        = color.RGBA { R:  57, G:  59, B:  57, A: 255 }
+var colorInputShadow   = color.RGBA { R: 143, G: 146, B:  91, A: 255 }
+var colorHighlight     = color.RGBA { R: 207, G: 215, B: 210, A: 255 }
+var colorBackground    = color.RGBA { R: 169, G: 171, B: 168, A: 255 }
+var colorCarvedPressed = color.RGBA { R: 129, G: 142, B: 137, A: 255 }
+var colorForeground    = color.Black
+var colorOutline       = color.Black
+
+var outline = tomo.Border {
+	Width: tomo.I(1),
+	Color: [4]color.Color {
+		colorOutline,
+		colorOutline,
+		colorOutline,
+		colorOutline,
+	},
+}
+
+var borderColorEngraved = [4]color.Color { colorShadow,      colorHighlight, colorHighlight, colorShadow }
+var borderColorLifted   = [4]color.Color { colorHighlight,   colorShadow,    colorShadow,    colorHighlight }
+var borderColorInput    = [4]color.Color { colorInputShadow, colorInput,     colorInput,     colorInputShadow }
+var borderColorFocused  = [4]color.Color { colorFocus,       colorFocus,     colorFocus,     colorFocus }
+
+var rules = []dataTheme.Rule {
+	// *.*[*]
+	dataTheme.Rule {
+		Default: dataTheme.AS (
+			dataTheme.AttrFace      { Face:  basicfont.Face7x13    },
+			dataTheme.AttrTextColor { Color: theme.ColorForeground },
+			dataTheme.AttrDotColor  { Color: theme.ColorAccent     },
+			dataTheme.AttrGap       { X: 8, Y: 8                   },
+		),
+	},
+
+	// *.Button[*]
+	dataTheme.Rule {
+		Role: theme.R("", "Button", ""),
+		Default: dataTheme.AS (
+			dataTheme.AttrBorder {
+				outline,
+				tomo.Border {
+					Width: tomo.I(1),
+					Color: borderColorLifted,
+				},
+			},
+			dataTheme.AttrPadding(tomo.I(4, 8)),
+			dataTheme.AttrColor { Color: theme.ColorRaised },
+		),
+		Pressed: dataTheme.AS (
+			dataTheme.AttrBorder {
+				outline,
+				tomo.Border {
+					Width: tomo.I(1, 0, 0, 1),
+					Color: borderColorEngraved,
+				},
+			},
+			dataTheme.AttrPadding(tomo.I(5, 8, 4, 9)),
+			dataTheme.AttrColor { Color: colorCarvedPressed },
+		),
+		Focused: dataTheme.AS (
+			dataTheme.AttrBorder {
+				outline,
+				tomo.Border {
+					Width: tomo.I(1),
+					Color: borderColorFocused,
+				},
+			},
+			dataTheme.AttrPadding(tomo.I(4, 8)),
+		),
+	},
+
+	// *.TextInput[*]
+	dataTheme.Rule {
+		Role: theme.R("", "TextInput", ""),
+		Default: dataTheme.AS (
+			dataTheme.AttrBorder {
+				outline,
+				tomo.Border {
+					Width: tomo.I(1),
+					Color: borderColorInput,
+				},
+			},
+			dataTheme.AttrColor { Color: colorInput },
+			dataTheme.AttrPadding(tomo.I(5, 4, 4, 5)),
+		),
+		Focused: dataTheme.AS (
+			dataTheme.AttrBorder {
+				outline,
+				tomo.Border {
+					Width: tomo.I(1),
+					Color: borderColorFocused,
+				},
+			},
+		),
+	},
+	
+	// *.NumberInput[*]
+	dataTheme.Rule {
+		Role: theme.R("", "NumberInput", ""),
+		Default: dataTheme.AS (
+			dataTheme.AttrGap { },
+		),
+	},
+
+	// *.Container[sunken]
+	dataTheme.Rule {
+		Role: theme.R("", "Container", "sunken"),
+		Default: dataTheme.AS (
+			dataTheme.AttrBorder {
+				outline,
+				tomo.Border {
+					Width: tomo.I(1, 0, 0, 1),
+					Color: borderColorEngraved,
+				},
+			},
+			dataTheme.AttrColor { Color: theme.ColorSunken },
+			dataTheme.AttrPadding(tomo.I(8)),
+		),
+	},
+
+	// *.Container[outer]
+	dataTheme.Rule {
+		Role: theme.R("", "Container", "outer"),
+		Default: dataTheme.AS (
+			dataTheme.AttrColor { Color: theme.ColorBackground },
+			dataTheme.AttrPadding(tomo.I(8)),
+		),
+	},
+
+	// *.Heading[*]
+	dataTheme.Rule {
+		Role: theme.R("", "Heading", ""),
+		Default: dataTheme.AS (
+			dataTheme.AttrAlign { X: tomo.AlignMiddle, Y: tomo.AlignMiddle },
+		),
+	},
+
+	// *.Separator[*]
+	dataTheme.Rule {
+		Role: theme.R("", "Separator", ""),
+		Default: dataTheme.AS (
+			dataTheme.AttrBorder {
+				tomo.Border {
+					Width: tomo.I(1),
+					Color: borderColorEngraved,
+				},
+			},
+		),
+	},
+
+	// *.Slider[*]
+	dataTheme.Rule {
+		Role: theme.R("", "Slider", ""),
+		Default: dataTheme.AS (
+			dataTheme.AttrBorder {
+				outline,
+				tomo.Border {
+					Width: tomo.I(1, 0, 0, 1),
+					Color: borderColorEngraved,
+				},
+			},
+			dataTheme.AttrColor { Color: colorGutter },
+			dataTheme.AttrPadding(tomo.I(0, 1, 1, 0)),
+		),
+		Focused: dataTheme.AS (
+			dataTheme.AttrBorder {
+				outline,
+				tomo.Border {
+					Width: tomo.I(1),
+					Color: borderColorFocused,
+				},
+			},
+			dataTheme.AttrPadding(tomo.I(0)),
+		),
+	},
+	
+	// *.Slider[horizontal]
+	dataTheme.Rule {
+		Role: theme.R("", "Slider", "horizontal"),
+		Default: dataTheme.AS(dataTheme.AttrMinimumSize { X: 48 }),
+	},
+	
+	// *.Slider[vertical]
+	dataTheme.Rule {
+		Role: theme.R("", "Slider", "vertical"),
+		Default: dataTheme.AS(dataTheme.AttrMinimumSize { Y: 48 }),
+	},
+
+	// *.SliderHandle[*]
+	dataTheme.Rule {
+		Role: theme.R("", "SliderHandle", ""),
+		Default: dataTheme.AS (
+			dataTheme.AttrBorder {
+				outline,
+				tomo.Border {
+					Width: tomo.I(1),
+					Color: borderColorLifted,
+				},
+			},
+			dataTheme.AttrColor { Color: theme.ColorRaised },
+			dataTheme.AttrMinimumSize { X: 12, Y: 12, },
+		),
+	},
+
+	// *.Checkbox[*]
+	dataTheme.Rule {
+		Role: theme.R("", "Checkbox", ""),
+		Default: dataTheme.AS (
+			dataTheme.AttrBorder {
+				outline,
+				tomo.Border {
+					Width: tomo.I(1, 0, 0, 1),
+					Color: borderColorEngraved,
+				},
+			},
+			dataTheme.AttrColor { Color: theme.ColorSunken },
+			dataTheme.AttrPadding(tomo.I(0, 1, 1, 0)),
+			dataTheme.AttrMinimumSize { X: 19, Y: 19 },
+		),
+		Focused: dataTheme.AS (
+			dataTheme.AttrBorder {
+				outline,
+				tomo.Border {
+					Width: tomo.I(1),
+					Color: borderColorFocused,
+				},
+			},
+			dataTheme.AttrPadding(tomo.I(0)),
+		),
+	},
+
+	// *.LabelCheckbox[*]
+	dataTheme.Rule {
+		Role: theme.R("", "LabelCheckbox", ""),
+		Default: dataTheme.AS (
+			dataTheme.AttrGap { X: 8, Y: 8 },
+		),
+	},
+}

internal/theme/missing.go

@@ -0,0 +1,24 @@
+package theme
+
+import "image"
+import "image/color"
+
+type missingTexture int
+
+func (texture missingTexture) ColorModel () color.Model {
+	return color.RGBAModel
+}
+
+func (texture missingTexture) Bounds () image.Rectangle {
+	return image.Rect(0, 0, int(texture), int(texture))
+}
+
+func (texture missingTexture) At (x, y int) color.Color {
+	x /= 8
+	y /= 8
+	if (x + y) % 2 == 0 {
+		return color.RGBA { R: 0xFF, B: 0xFF, A: 0xFF }
+	} else {
+		return color.RGBA { A: 0xFF }
+	}
+}

internal/theme/theme.go

@@ -0,0 +1,268 @@
+// Package theme provides a data-driven theme implementation.
+package theme
+
+import "image"
+import "image/color"
+import "git.tebibyte.media/tomo/tomo"
+import "git.tebibyte.media/tomo/tomo/data"
+import "git.tebibyte.media/tomo/tomo/event"
+import "git.tebibyte.media/tomo/tomo/input"
+import "git.tebibyte.media/tomo/tomo/theme"
+import "git.tebibyte.media/tomo/tomo/canvas"
+
+// this is CSS's bastard child
+
+// Theme allows the use of data to define a visual style.
+type Theme struct {
+	// Textures maps texture names to image textures.
+	Textures map[string] image.Image
+	textures map[string] canvas.TextureCloser // private texture cache
+	missing  canvas.TextureCloser             // cache for "missing" texture
+	
+	// Rules determines which styles get applied to which Objects.
+	Rules []Rule
+
+	// Colors maps theme.Color values to color.RGBA values.
+	Colors map[theme.Color] color.Color
+
+	// This type does not handle icons, and as such, a special icon theme
+	// must be separately specified.
+	IconTheme
+}
+
+// IconTheme implements the part of theme.Theme that handles icons.
+type IconTheme interface {
+	// Icon returns a texture of the corresponding icon ID.
+	Icon (theme.Icon, theme.IconSize) canvas.Texture
+	// MimeIcon returns an icon corresponding to a MIME type.
+	MimeIcon (data.Mime, theme.IconSize) canvas.Texture
+}
+
+// Rule describes under what circumstances should certain style attributes be
+// active.
+type Rule struct {
+	Role theme.Role
+	Default AttrSet
+	Hovered AttrSet
+	Pressed AttrSet
+	Focused AttrSet
+}
+
+// AttrSet is a set of attributes wherein only one/zero of each attribute type
+// can exist. I deserve to be imprisoned for the way I made this work (look in
+// attribute.go). Its zero value can be used safely, and you can copy it if you
+// want, but it will point to the same set of attributes.
+type AttrSet struct {
+	set map[int] Attr
+}
+
+// AS builds an AttrSet out of a vararg list of Attr values.
+func AS (attrs ...Attr) AttrSet {
+	set := AttrSet { }
+	set.Add(attrs...)
+	return set
+}
+
+// Add adds attributes to the set.
+func (this *AttrSet) Add (attrs ...Attr) {
+	this.ensure()
+	for _, attr := range attrs {
+		this.set[attr.attr()] = attr
+	}
+}
+
+// MergeUnder takes attributes from another set and adds them if they don't
+// already exist in this one.
+func (this *AttrSet) MergeUnder (other AttrSet) {
+	this.ensure()
+	if other.set == nil { return }
+	for _, attr := range other.set {
+		if _, exists := this.set[attr.attr()]; !exists {
+			this.Add(attr)
+		}
+	}
+}
+
+// MergeOver takes attributes from another set and adds them, overriding this
+// one.
+func (this *AttrSet) MergeOver (other AttrSet) {
+	this.ensure()
+	if other.set == nil { return }
+	for _, attr := range other.set {
+		this.Add(attr)
+	}
+}
+
+func (this *AttrSet) ensure () {
+	if this.set == nil { this.set = make(map[int] Attr) }
+}
+
+func (this *Theme) execute (object tomo.Object, set AttrSet) {
+	box := object.GetBox()
+	
+	for _, attr := range set.set {
+		switch attr := attr.(type) {
+		case AttrColor:
+			box.SetColor(attr.Color)
+		case AttrTexture:
+			box.SetTexture(this.texture(string(attr)))
+		case AttrBorder:
+			box.SetBorder([]tomo.Border(attr)...)
+		case AttrMinimumSize:
+			box.SetMinimumSize(image.Point(attr))
+		case AttrPadding:
+			box.SetPadding(tomo.Inset(attr))
+		case AttrGap:
+			if box, ok := box.(tomo.ContainerBox); ok {
+				box.SetGap(image.Point(attr))
+			}
+		case AttrTextColor:
+			if box, ok := box.(tomo.TextBox); ok {
+				box.SetTextColor(attr.Color)
+			}
+		case AttrDotColor:
+			if box, ok := box.(tomo.TextBox); ok {
+				box.SetDotColor(attr.Color)
+			}
+		case AttrFace:
+			if box, ok := box.(tomo.TextBox); ok {
+				box.SetFace(attr)
+			}
+		case AttrAlign:
+			if box, ok := box.(tomo.ContentBox); ok {
+				box.SetAlign(attr.X, attr.Y)
+			}
+		default:
+			panic("bug: nasin/internal/theme.Theme: unexpected attribute")
+		}
+	}
+}
+
+func (this *Theme) texture (name string) canvas.Texture {
+	this.ensureTextureCache()
+	if texture, ok := this.textures[name]; ok {
+		return texture
+	}
+	if this.Textures == nil {
+		if source, ok := this.Textures[name]; ok {
+			texture := tomo.NewTexture(source)
+			this.textures[name] = texture
+			return texture
+		}
+	}
+	return this.missingTexture()
+}
+
+func (this *Theme) missingTexture () canvas.Texture {
+	if this.missing == nil {
+		this.missing = tomo.NewTexture(missingTexture(16))
+	}
+	return this.missing
+}
+
+func (this *Theme) ensureTextureCache () {
+	if this.textures == nil { this.textures = make(map[string] canvas.TextureCloser) }
+}
+
+// setsFor builds flattened attr sets for a specific role based on the rules list
+func (this *Theme) setsFor (role theme.Role) (defaul, hovered, pressed, focused AttrSet) {
+	for _, current := range this.Rules {
+		// check for a match
+		packageMatch := current.Role.Package == role.Package || current.Role.Package == ""
+		objectMatch  := current.Role.Object  == role.Object  || current.Role.Object  == ""
+		variantMatch := current.Role.Variant == role.Variant || current.Role.Variant == ""
+		if packageMatch && objectMatch && variantMatch {
+			// if found, merge and override
+			defaul.MergeOver(current.Default)
+			hovered.MergeOver(current.Hovered)
+			pressed.MergeOver(current.Pressed)
+			focused.MergeOver(current.Focused)
+		}
+	}
+
+	// hovered and pressed are mutually exclusive states, so we compress
+	// them with the default state.
+	hovered.MergeUnder(defaul)
+	pressed.MergeUnder(defaul)
+	return defaul, hovered, pressed, focused
+}
+
+func (this *Theme) Apply (object tomo.Object, role theme.Role) event.Cookie {
+	pressed := false
+	hovered := false
+	box := object.GetBox()
+
+	defaultSet, hoveredSet, pressedSet, focusedSet := this.setsFor(role)
+
+	updateStyle := func () {
+		if pressed {
+			this.execute(object, pressedSet)
+		} else if hovered {
+			this.execute(object, hoveredSet)
+		} else {
+			this.execute(object, defaultSet)
+		}
+		if box.Focused() && !pressed {
+			this.execute(object, focusedSet)
+		}
+	}
+	updateStyle()
+	
+	return event.MultiCookie (
+		box.OnFocusEnter(updateStyle),
+		box.OnFocusLeave(updateStyle),
+		box.OnMouseDown(func (button input.Button) {
+			if button != input.ButtonLeft { return }
+			pressed = true
+			updateStyle()
+		}),
+		box.OnMouseUp(func (button input.Button) {
+			if button != input.ButtonLeft { return }
+			pressed = false
+			updateStyle()
+		}),
+		box.OnMouseEnter(func () {
+			hovered = true
+			updateStyle()
+		}),
+		box.OnMouseLeave(func () {
+			hovered = false
+			updateStyle()
+		}))
+
+}
+
+func (this *Theme) RGBA (c theme.Color) (r, g, b, a uint32) {
+	if this.Colors == nil { return 0xFFFF, 0, 0xFFFF, 0xFFFF }
+	color, ok := this.Colors[c]
+	if !ok { return 0xFFFF, 0, 0xFFFF, 0xFFFF }
+	return color.RGBA()
+}
+
+func (this *Theme) Icon (icon theme.Icon, size theme.IconSize) canvas.Texture {
+	if this.IconTheme == nil {
+		return this.missingTexture()
+	} else {
+		return this.IconTheme.Icon(icon, size)
+	}
+}
+
+func (this *Theme) MimeIcon (mime data.Mime, size theme.IconSize) canvas.Texture {
+	if this.IconTheme == nil {
+		return this.missingTexture()
+	} else {
+		return this.IconTheme.MimeIcon(mime, size)
+	}
+}
+
+// Close closes all cached textures this theme has open. Do not call this while
+// the theme is in use.
+func (this *Theme) Close () error {
+	this.missing.Close()
+	this.missing = nil
+	for _, texture := range this.textures {
+		texture.Close()
+	}
+	this.textures = nil
+	return nil
+}