Removed tiler for now, needs to be rethought a bit

README.md

@@ -1,6 +1,5 @@
 # tomo
 
-WIP rewrite of tomo.
+[![Go Reference](https://pkg.go.dev/badge/git.tebibyte.media/tomo/tomo.svg)](https://pkg.go.dev/git.tebibyte.media/tomo/tomo)
 
-This module will serve as a wafer-thin collection of interfaces and glue code so
-that plugins will be an actual viable concept.
+Tomo is a lightweight GUI toolkit written in pure Go.

application.go

@@ -0,0 +1,113 @@
+package tomo
+
+import "image"
+
+// Application represents an application object.
+type Application interface {
+	// Describe returns a description of the application.
+	Describe () ApplicationDescription
+
+	// Init performs the initial setup of the application.
+	Init ()
+}
+
+// ApplicationDescription describes the name and type of an application.
+type ApplicationDescription struct {
+	// The name or ID of the application.
+	Name string
+
+	// Role describes what the application does.
+	Role ApplicationRole
+}
+
+// String satisfies the fmt.Stringer interface.
+func (application ApplicationDescription) String () string {
+	if application.Name == "" {
+		return application.Role.String()
+	} else {
+		return application.Name
+	}
+}
+
+// ApplicationRole describes what an application does.
+type ApplicationRole int; const (
+	RoleUnknown ApplicationRole = iota
+
+	RoleWebBrowser
+	RoleMesssanger
+	RolePhone
+	RoleMail
+
+	RoleTerminalEmulator
+	RoleFileBrowser
+	RoleTextEditor
+
+	RoleDocumentViewer
+	RoleWordProcessor
+	RoleSpreadsheet
+	RoleSlideshow
+	RoleCalculator
+
+	RolePreferences
+	RoleProcessManager
+	RoleSystemInformation
+	RoleManual
+
+	RoleCamera
+	RoleImageViewer
+	RoleMediaPlayer
+	RoleImageEditor
+	RoleAudioEditor
+	RoleVideoEditor
+
+	RoleClock
+	RoleCalendar
+	RoleChecklist
+)
+
+// String satisfies the fmt.Stringer interface.
+func (role ApplicationRole) String () string {
+	switch role {
+	case RoleWebBrowser:        return "Web Browser"
+	case RoleMesssanger:        return "Messsanger"
+	case RolePhone:             return "Phone"
+	case RoleMail:              return "Mail"
+	case RoleTerminalEmulator:  return "Terminal Emulator"
+	case RoleFileBrowser:       return "File Browser"
+	case RoleTextEditor:        return "Text Editor"
+	case RoleDocumentViewer:    return "Document Viewer"
+	case RoleWordProcessor:     return "Word Processor"
+	case RoleSpreadsheet:       return "Spreadsheet"
+	case RoleSlideshow:         return "Slideshow"
+	case RoleCalculator:        return "Calculator"
+	case RolePreferences:       return "Preferences"
+	case RoleProcessManager:    return "Process Manager"
+	case RoleSystemInformation: return "System Information"
+	case RoleManual:            return "Manual"
+	case RoleCamera:            return "Camera"
+	case RoleImageViewer:       return "Image Viewer"
+	case RoleMediaPlayer:       return "Media Player"
+	case RoleImageEditor:       return "Image Editor"
+	case RoleAudioEditor:       return "Audio Editor"
+	case RoleVideoEditor:       return "Video Editor"
+	case RoleClock:             return "Clock"
+	case RoleCalendar:          return "Calendar"
+	case RoleChecklist:         return "Checklist"
+	default:                    return "unknown"
+	}
+}
+
+// RunApplication is like Run, but runs an application.
+func RunApplication (application Application) error {
+	return Run(application.Init)
+}
+
+// NewApplicationWindow creates a window for an application. It will
+// automatically set window information to signal to the OS that the window is
+// owned by the application.
+func NewApplicationWindow (application Application, bounds image.Rectangle) (MainWindow, error) {
+	window, err := NewWindow(bounds)
+	if err != nil { return nil, err }
+	window.SetTitle(application.Describe().String())
+	return window, nil
+}

backend.go

@@ -3,6 +3,7 @@ package tomo
 import "sort"
 import "image"
 import "errors"
+import "git.tebibyte.media/tomo/tomo/canvas"
 
 // Backend is any Tomo implementation. Backends handle window creation, layout,
 // rendering, and events so that there can be as many platform-specific
@@ -10,15 +11,22 @@ import "errors"
 type Backend interface {
 	// These methods create new objects. The backend must reject any object
 	// that was not made by it.
-	NewWindow       (image.Rectangle) (MainWindow, error)
 	NewBox          () Box
 	NewTextBox      () TextBox
 	NewCanvasBox    () CanvasBox
 	NewContainerBox () ContainerBox
 
+	// NewWindow creates a normal MainWindow and returns it.
+	NewWindow (image.Rectangle) (MainWindow, error)
+
+	// NewPlainWindow creates an undecorated window that does not appear in
+	// window lists and returns it. This is intended for making things like
+	// panels, docks, etc.
+	NewPlainWindow (image.Rectangle) (MainWindow, error)
+
 	// NewTexture creates a new texture from an image. The backend must
 	// reject any texture that was not made by it.
-	NewTexture (image.Image) Texture
+	NewTexture (image.Image) canvas.TextureCloser
 
 	// Run runs the event loop until Stop() is called, or the backend
 	// experiences a fatal error.

canvas/canvas.go

@@ -44,8 +44,9 @@ type Pen interface {
 	StrokeWeight (int)         // how thick the stroke is
 	StrokeAlign  (StrokeAlign) // where the stroke is drawn
 
-	Stroke (color.Color) // Sets the stroke to a solid color
-	Fill   (color.Color) // Sets the fill to a solid color
+	Stroke  (color.Color) // Sets the stroke to a solid color
+	Fill    (color.Color) // Sets the fill to a solid color
+	Texture (Texture)     // Overlaps a texture onto the fill color
 }
 
 // Canvas is an image that supports drawing paths.

canvas/texture.go

@@ -0,0 +1,20 @@
+package canvas
+
+import "io"
+import "image"
+
+// Texture is a handle that points to a 2D raster image managed by the backend.
+type Texture interface {
+	image.Image
+
+	// Clip returns a smaller section of this texture, pointing to the same
+	// internal data.
+	Clip (image.Rectangle) Texture
+}
+
+// TextureCloser is a texture that can be closed. Anything that receives a
+// TextureCloser must close it after use.
+type TextureCloser interface {
+	Texture
+	io.Closer
+}

object.go

@@ -135,7 +135,7 @@ type Box interface {
 	// SetTexture sets a repeating background texture. If the texture is
 	// transparent, it will be overlayed atop the color specified by
 	// SetColor().
-	SetTexture     (Texture)
+	SetTexture     (canvas.Texture)
 	// SetBorder sets the Border(s) of the box. The first Border will be the
 	// most outset, and the last Border will be the most inset.
 	SetBorder      (...Border)
@@ -258,11 +258,6 @@ type TextBox interface {
 type ContainerBox interface {
 	ContentBox
 
-	// SetPropagateEvents specifies whether or not child Objects will
-	// receive user input events. It is true by default. If it is false, all
-	// user input that would otherwise be directed to a child Box is
-	// directed to this Box.
-	SetPropagateEvents (bool)
 	// SetGap sets the gap between child Objects.
 	SetGap             (image.Point)
 	// Add appends a child Object.
@@ -275,13 +270,22 @@ type ContainerBox interface {
 	Insert             (child Object, before Object)
 	// Clear removes all child Objects.
 	Clear              ()
-	// Length returns the amount of child objects.
+	// Length returns the amount of child Objects.
 	Length             () int
 	// At returns the child Object at the specified index.
 	At                 (int) Object
 	// SetLayout sets the layout of this Box. Child Objects will be
 	// positioned according to it.
 	SetLayout          (Layout)
+
+	// These methods control whether certain user input events get
+	// propagated to child Objects. If set to true, the relevant events will
+	// be sent to this container. If set to false (which is the default),
+	// the events will be sent to the appropriate child Object.
+	CaptureDND      (bool)
+	CaptureMouse    (bool)
+	CaptureScroll   (bool)
+	CaptureKeyboard (bool)
 }
 
 // LayoutHints are passed to a layout to tell it how to arrange child boxes.

path.go

@@ -0,0 +1,188 @@
+package tomo
+
+import "io"
+import "os"
+import "io/fs"
+import "strings"
+import "path/filepath"
+
+// FS is Tomo's implementation of fs.FS. It provides access to a specific part
+// of the filesystem.
+type FS struct {
+	path string
+}
+
+// FileWriter is a writable version of fs.File.
+type FileWriter interface {
+	fs.File
+	io.Writer
+}
+
+// ApplicationUserDataFS returns an FS that an application can use to store user
+// data files.
+func ApplicationUserDataFS (app ApplicationDescription) (*FS, error) {
+	return appFs(userDataDir, app)
+}
+
+// ApplicationUserConfigFS returns an FS that an application can use to store
+// user configuration files.
+func ApplicationUserConfigFS (app ApplicationDescription) (*FS, error) {
+	configDir, err := os.UserConfigDir()
+	if err != nil { return nil, err }
+	return appFs(configDir, app)
+}
+
+// ApplicationUserCacheFS returns an FS that an application can use to store
+// user cache files.
+func ApplicationUserCacheFS (app ApplicationDescription) (*FS, error) {
+	cacheDir, err := os.UserCacheDir()
+	if err != nil { return nil, err }
+	return appFs(cacheDir, app)
+}
+
+func pathErr (op, path string, err error) error {
+	return &fs.PathError {
+		Op:   op,
+		Path: path,
+		Err:  err,
+	}
+}
+
+func appFs (root string, app ApplicationDescription) (*FS, error) {
+	// remove slashes
+	appname := app.String()
+	appname = strings.ReplaceAll(appname, "/", "-")
+	appname = strings.ReplaceAll(appname, "\\", "-")
+
+	path := filepath.Join(root, appname)
+
+	// ensure the directory actually exists
+	err := os.MkdirAll(path, 755)
+	if err != nil { return nil, err }
+
+	return &FS { path: path }, nil
+}
+
+func (this FS) subPath (name string) (string, error) {
+	if !fs.ValidPath(name)         { return "", fs.ErrInvalid }
+	if strings.Contains(name, "/") { return "", fs.ErrInvalid }
+	return filepath.Join(this.path, name), nil
+}
+
+// Open opens the named file.
+func (this FS) Open (name string) (fs.File, error) {
+	path, err := this.subPath(name)
+	if err != nil {
+		return nil, pathErr("open", name, err)
+	}
+
+	return os.Open(path)
+}
+
+// Create creates or truncates the named file.
+func (this FS) Create (name string) (FileWriter, error) {
+	path, err := this.subPath(name)
+	if err != nil {
+		return nil, pathErr("create", name, err)
+	}
+
+	return os.Create(path)
+}
+
+// OpenFile is the generalized open call; most users will use Open or Create
+// instead.
+func (this FS) OpenFile (
+	name string,
+	flag int,
+	perm os.FileMode,
+) (
+	FileWriter,
+	error,
+) {
+	path, err := this.subPath(name)
+	if err != nil {
+		return nil, pathErr("open", name, err)
+	}
+
+	return os.OpenFile(path, flag, perm)
+}
+
+// ReadDir reads the named directory and returns a list of directory entries
+// sorted by filename.
+func (this FS) ReadDir (name string) ([]fs.DirEntry, error) {
+	path, err := this.subPath(name)
+	if err != nil {
+		return nil, pathErr("readdir", name, err)
+	}
+
+	return os.ReadDir(path)
+}
+
+// ReadFile reads the named file and returns its contents.
+// A successful call returns a nil error, not io.EOF.
+// (Because ReadFile reads the whole file, the expected EOF
+// from the final Read is not treated as an error to be reported.)
+//
+// The caller is permitted to modify the returned byte slice.
+func (this FS) ReadFile (name string) ([]byte, error) {
+	path, err := this.subPath(name)
+	if err != nil {
+		return nil, pathErr("readfile", name, err)
+	}
+
+	return os.ReadFile(path)
+}
+
+// WriteFile writes data to the named file, creating it if necessary.
+func (this FS) WriteFile (name string, data []byte, perm os.FileMode) error {
+	path, err := this.subPath(name)
+	if err != nil {
+		return pathErr("writefile", name, err)
+	}
+
+	return os.WriteFile(path, data, perm)
+}
+
+// Stat returns a FileInfo describing the file.
+func (this FS) Stat (name string) (fs.FileInfo, error) {
+	path, err := this.subPath(name)
+	if err != nil {
+		return nil, pathErr("stat", name, err)
+	}
+
+	return os.Stat(path)
+}
+
+// Remove removes the named file or (empty) directory.
+func (this FS) Remove (name string) error {
+	path, err := this.subPath(name)
+	if err != nil {
+		return pathErr("remove", name, err)
+	}
+
+	return os.Remove(path)
+}
+
+// RemoveAll removes name and any children it contains.
+func (this FS) RemoveAll (name string) error {
+	path, err := this.subPath(name)
+	if err != nil {
+		return pathErr("removeall", name, err)
+	}
+
+	return os.RemoveAll(path)
+}
+
+// Rename renames (moves) oldname to newname.
+func (this FS) Rename (oldname, newname string) error {
+	oldpath, err := this.subPath(oldname)
+	if err != nil {
+		return pathErr("rename", oldname, err)
+	}
+	newpath, err := this.subPath(newname)
+	if err != nil {
+		return pathErr("rename", newname, err)
+	}
+
+	return os.Rename(oldpath, newpath)
+}

texture.go

@@ -1,29 +0,0 @@
-package tomo
-
-import "io"
-import "image"
-
-// Texture is a handle that points to a 2D raster image managed by the backend.
-type Texture interface {
-	io.Closer
-
-	// Clip returns a smaller section of this texture, pointing to the same
-	// internal data. Becaue of this, closing a clipped section will close
-	// the original texture as well.
-	Clip (image.Rectangle) Texture
-}
-
-type protectedTexture struct {
-	Texture
-}
-
-func (protectedTexture) Close () error {
-	return nil
-}
-
-// Protect makes the Close() method of a texture do nothing. This is useful if
-// several of the same texture are given out to different objects, but only one
-// has the responsibility of closing it.
-func Protect (texture Texture) Texture {
-	return protectedTexture { Texture: texture }
-}

theme/icon.go

@@ -2,6 +2,7 @@ package theme
 
 import "git.tebibyte.media/tomo/tomo"
 import "git.tebibyte.media/tomo/tomo/data"
+import "git.tebibyte.media/tomo/tomo/canvas"
 
 // IconSize represents the size of an icon.
 type IconSize int; const (
@@ -10,6 +11,18 @@ type IconSize int; const (
 	IconSizeLarge
 )
 
+// String satisfies the fmt.Stringer interface.
+func (size IconSize) String () string {
+	switch size {
+	case IconSizeSmall:  return "small"
+	case IconSizeMedium: return "medium"
+	case IconSizeLarge:  return "large"
+	default:             return "unknown"
+	}
+}
+
+// TODO: the Icon type, along with its String method, needs to be codegen'd.
+
 // Icon represents an icon ID.
 type Icon int; const (
 	// --- Objects --- //
@@ -18,7 +31,7 @@ type Icon int; const (
 	IconFile Icon = iota
 	IconDirectory
 	IconDirectoryFull
-	
+
 	// places
 	IconDownloads
 	IconPhotos
@@ -33,7 +46,7 @@ type Icon int; const (
 	Icon3DObjects
 	IconHistory
 	IconPreferences
-	
+
 	// storage
 	IconStorage // generic
 	IconMagneticTape
@@ -46,7 +59,7 @@ type Icon int; const (
 	IconRAMDisk
 	IconCD
 	IconDVD
-	
+
 	// network
 	IconNetwork // generic
 	IconLocalNetwork
@@ -56,10 +69,11 @@ type Icon int; const (
 	IconCell
 	IconBluetooth
 	IconRadio
-	
+
 	// devices
 	IconDevice // generic
 	IconRouter
+	IconSwitch
 	IconServer
 	IconDesktop
 	IconLaptop
@@ -67,7 +81,7 @@ type Icon int; const (
 	IconPhone
 	IconWatch
 	IconCamera
-	
+
 	// peripherals
 	IconPeripheral // generic
 	IconKeyboard
@@ -79,7 +93,7 @@ type Icon int; const (
 	IconPenTablet
 	IconTrackpad
 	IconController
-	
+
 	// i/o
 	IconPort // generic
 	IconEthernetPort
@@ -93,15 +107,15 @@ type Icon int; const (
 	IconHDMIPort
 	IconDisplayPort
 	IconInfrared
-	
+
 	// --- Actions --- //
-	
+
 	// files
 	IconOpen
 	IconOpenIn
 	IconSave
 	IconSaveAs
-	IconPrints
+	IconPrint
 	IconNew
 	IconNewDirectory
 	IconDelete
@@ -109,7 +123,7 @@ type Icon int; const (
 	IconGetInformation
 	IconChangePermissions
 	IconRevert
-	
+
 	// list management
 	IconAdd
 	IconRemove
@@ -117,7 +131,7 @@ type Icon int; const (
 	IconRemoveBookmark
 	IconAddFavorite
 	IconRemoveFavorite
-	
+
 	// media
 	IconPlay
 	IconPause
@@ -130,7 +144,7 @@ type Icon int; const (
 	IconVolumeUp
 	IconVolumeDown
 	IconMute
-	
+
 	// editing
 	IconUndo
 	IconRedo
@@ -143,8 +157,8 @@ type Icon int; const (
 	IconSelectNone
 	IconIncrement
 	IconDecrement
-	
-	// window management	
+
+	// window management
 	IconClose
 	IconQuit
 	IconIconify
@@ -167,7 +181,7 @@ type Icon int; const (
 	IconMove
 	IconResize
 	IconGoTo
-	
+
 	// tools
 	IconTransform
 	IconTranslate
@@ -188,9 +202,9 @@ type Icon int; const (
 	IconEraser
 	IconText
 	IconEyedropper
-	
+
 	// --- Status --- //
-	
+
 	// dialogs
 	IconInformation
 	IconQuestion
@@ -198,7 +212,7 @@ type Icon int; const (
 	IconError
 	IconCancel
 	IconOkay
-	
+
 	// network
 	IconCellSignal0
 	IconCellSignal1
@@ -208,7 +222,7 @@ type Icon int; const (
 	IconWirelessSignal1
 	IconWirelessSignal2
 	IconWirelessSignal3
-	
+
 	// power
 	IconBattery0
 	IconBattery1
@@ -218,7 +232,7 @@ type Icon int; const (
 	IconBrightness1
 	IconBrightness2
 	IconBrightness3
-	
+
 	// media
 	IconVolume0
 	IconVolume1
@@ -226,68 +240,202 @@ type Icon int; const (
 	IconVolume3
 )
 
+// String satisfies the fmt.Stringer interface.
+func (id Icon) String () string {
+	switch id {
+	case IconFile: return "File"
+	case IconDirectory: return "Directory"
+	case IconDirectoryFull: return "DirectoryFull"
+	case IconDownloads: return "Downloads"
+	case IconPhotos: return "Photos"
+	case IconBooks: return "Books"
+	case IconDocuments: return "Documents"
+	case IconRepositories: return "Repositories"
+	case IconMusic: return "Music"
+	case IconArchives: return "Archives"
+	case IconFonts: return "Fonts"
+	case IconBinaries: return "Binaries"
+	case IconVideos: return "Videos"
+	case Icon3DObjects: return "3DObjects"
+	case IconHistory: return "History"
+	case IconPreferences: return "Preferences"
+	case IconStorage: return "Storage"
+	case IconMagneticTape: return "MagneticTape"
+	case IconFloppyDisk: return "FloppyDisk"
+	case IconHardDisk: return "HardDisk"
+	case IconSolidStateDrive: return "SolidStateDrive"
+	case IconFlashDrive: return "FlashDrive"
+	case IconMemoryCard: return "MemoryCard"
+	case IconROMDisk: return "ROMDisk"
+	case IconRAMDisk: return "RAMDisk"
+	case IconCD: return "CD"
+	case IconDVD: return "DVD"
+	case IconNetwork: return "Network"
+	case IconLocalNetwork: return "LocalNetwork"
+	case IconInternet: return "Internet"
+	case IconEthernet: return "Ethernet"
+	case IconWireless: return "Wireless"
+	case IconCell: return "Cell"
+	case IconBluetooth: return "Bluetooth"
+	case IconRadio: return "Radio"
+	case IconDevice: return "Device"
+	case IconRouter: return "Router"
+	case IconServer: return "Server"
+	case IconDesktop: return "Desktop"
+	case IconLaptop: return "Laptop"
+	case IconTablet: return "Tablet"
+	case IconPhone: return "Phone"
+	case IconWatch: return "Watch"
+	case IconCamera: return "Camera"
+	case IconPeripheral: return "Peripheral"
+	case IconKeyboard: return "Keyboard"
+	case IconMouse: return "Mouse"
+	case IconMonitor: return "Monitor"
+	case IconWebcam: return "Webcam"
+	case IconMicrophone: return "Microphone"
+	case IconSpeaker: return "Speaker"
+	case IconPenTablet: return "PenTablet"
+	case IconTrackpad: return "Trackpad"
+	case IconController: return "Controller"
+	case IconPort: return "Port"
+	case IconEthernetPort: return "EthernetPort"
+	case IconUSBPort: return "USBPort"
+	case IconParallelPort: return "ParallelPort"
+	case IconSerialPort: return "SerialPort"
+	case IconPS2Port: return "PS2Port"
+	case IconDisplayConnector: return "DisplayConnector"
+	case IconCGAPort: return "CGAPort"
+	case IconVGAPort: return "VGAPort"
+	case IconHDMIPort: return "HDMIPort"
+	case IconDisplayPort: return "DisplayPort"
+	case IconInfrared: return "Infrared"
+	case IconOpen: return "Open"
+	case IconOpenIn: return "OpenIn"
+	case IconSave: return "Save"
+	case IconSaveAs: return "SaveAs"
+	case IconPrint: return "Print"
+	case IconNew: return "New"
+	case IconNewDirectory: return "NewDirectory"
+	case IconDelete: return "Delete"
+	case IconRename: return "Rename"
+	case IconGetInformation: return "GetInformation"
+	case IconChangePermissions: return "ChangePermissions"
+	case IconRevert: return "Revert"
+	case IconAdd: return "Add"
+	case IconRemove: return "Remove"
+	case IconAddBookmark: return "AddBookmark"
+	case IconRemoveBookmark: return "RemoveBookmark"
+	case IconAddFavorite: return "AddFavorite"
+	case IconRemoveFavorite: return "RemoveFavorite"
+	case IconPlay: return "Play"
+	case IconPause: return "Pause"
+	case IconStop: return "Stop"
+	case IconFastForward: return "FastForward"
+	case IconRewind: return "Rewind"
+	case IconToBeginning: return "ToBeginning"
+	case IconToEnd: return "ToEnd"
+	case IconRecord: return "Record"
+	case IconVolumeUp: return "VolumeUp"
+	case IconVolumeDown: return "VolumeDown"
+	case IconMute: return "Mute"
+	case IconUndo: return "Undo"
+	case IconRedo: return "Redo"
+	case IconCut: return "Cut"
+	case IconCopy: return "Copy"
+	case IconPaste: return "Paste"
+	case IconFind: return "Find"
+	case IconReplace: return "Replace"
+	case IconSelectAll: return "SelectAll"
+	case IconSelectNone: return "SelectNone"
+	case IconIncrement: return "Increment"
+	case IconDecrement: return "Decrement"
+	case IconClose: return "Close"
+	case IconQuit: return "Quit"
+	case IconIconify: return "Iconify"
+	case IconShade: return "Shade"
+	case IconMaximize: return "Maximize"
+	case IconFullScreen: return "FullScreen"
+	case IconRestore: return "Restore"
+	case IconExpand: return "Expand"
+	case IconContract: return "Contract"
+	case IconBack: return "Back"
+	case IconForward: return "Forward"
+	case IconUp: return "Up"
+	case IconDown: return "Down"
+	case IconReload: return "Reload"
+	case IconZoomIn: return "ZoomIn"
+	case IconZoomOut: return "ZoomOut"
+	case IconZoomReset: return "ZoomReset"
+	case IconMove: return "Move"
+	case IconResize: return "Resize"
+	case IconGoTo: return "GoTo"
+	case IconTransform: return "Transform"
+	case IconTranslate: return "Translate"
+	case IconRotate: return "Rotate"
+	case IconScale: return "Scale"
+	case IconWarp: return "Warp"
+	case IconCornerPin: return "CornerPin"
+	case IconSelectRectangle: return "SelectRectangle"
+	case IconSelectEllipse: return "SelectEllipse"
+	case IconSelectLasso: return "SelectLasso"
+	case IconSelectGeometric: return "SelectGeometric"
+	case IconSelectAuto: return "SelectAuto"
+	case IconCrop: return "Crop"
+	case IconFill: return "Fill"
+	case IconGradient: return "Gradient"
+	case IconPencil: return "Pencil"
+	case IconBrush: return "Brush"
+	case IconEraser: return "Eraser"
+	case IconText: return "Text"
+	case IconEyedropper: return "Eyedropper"
+	case IconInformation: return "Information"
+	case IconQuestion: return "Question"
+	case IconWarning: return "Warning"
+	case IconError: return "Error"
+	case IconCancel: return "Cancel"
+	case IconOkay: return "Okay"
+	case IconCellSignal0: return "CellSignal0"
+	case IconCellSignal1: return "CellSignal1"
+	case IconCellSignal2: return "CellSignal2"
+	case IconCellSignal3: return "CellSignal3"
+	case IconWirelessSignal0: return "WirelessSignal0"
+	case IconWirelessSignal1: return "WirelessSignal1"
+	case IconWirelessSignal2: return "WirelessSignal2"
+	case IconWirelessSignal3: return "WirelessSignal3"
+	case IconBattery0: return "Battery0"
+	case IconBattery1: return "Battery1"
+	case IconBattery2: return "Battery2"
+	case IconBattery3: return "Battery3"
+	case IconBrightness0: return "Brightness0"
+	case IconBrightness1: return "Brightness1"
+	case IconBrightness2: return "Brightness2"
+	case IconBrightness3: return "Brightness3"
+	case IconVolume0: return "Volume0"
+	case IconVolume1: return "Volume1"
+	case IconVolume2: return "Volume2"
+	case IconVolume3: return "Volume3"
+
+	default: return "Unknown"
+	}
+}
+
 // Texture returns a texture of the corresponding icon ID.
-func (id Icon) Texture (size IconSize) tomo.Texture {
+func (id Icon) Texture (size IconSize) canvas.Texture {
 	if current == nil { return nil }
 	return current.Icon(id, size)
 }
 
 // MimeIcon returns an icon corresponding to a MIME type.
-func MimeIcon (mime data.Mime, size IconSize) tomo.Texture {
+func MimeIcon (mime data.Mime, size IconSize) canvas.Texture {
 	if current == nil { return nil }
 	return current.MimeIcon(mime, size)
 }
 
 // ApplicationIcon describes the icon of the application.
-type ApplicationIcon struct {
-	// The name or ID of the application. If applicable, this should
-	// correspond to the file name (without the path or extension) of the
-	// icon on the system. This field is optional.
-	Name string
-	
-	// Role describes what the application does. If a specific icon file
-	// cannot be found, a generic one is picked using this field.
-	Role ApplicationRole
-}
+type ApplicationIcon tomo.ApplicationDescription
 
 // Texture returns a texture of the corresponding icon ID.
-func (icon ApplicationIcon) Texture (size IconSize) tomo.Texture {
+func (icon ApplicationIcon) Texture (size IconSize) canvas.Texture {
 	if current == nil { return nil }
 	return current.ApplicationIcon(icon, size)
 }
-
-// ApplicationRole describes what an application does.
-type ApplicationRole int; const (
-	RoleUnknown ApplicationRole = iota
-
-	RoleWebBrowser
-	RoleMesssanger
-	RolePhone
-	RoleMail
-
-	RoleTerminalEmulator
-	RoleFileBrowser
-	RoleTextEditor
-
-	RoleDocumentViewer
-	RoleWordProcessor
-	RoleSpreadsheet
-	RoleSlideshow
-	RoleCalculator
-
-	RolePreferences
-	RoleProcessManager
-	RoleSystemInformation
-	RoleManual
-	
-	RoleCamera
-	RoleImageViewer
-	RoleMediaPlayer
-	RoleImageEditor
-	RoleAudioEditor
-	RoleVideoEditor
-
-	RoleClock
-	RoleCalendar
-	RoleChecklist
-)

theme/theme.go

@@ -1,15 +1,17 @@
 package theme
 
+import "fmt"
 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/canvas"
 
 // Role describes the role of an object.
 type Role struct {
 	// Package is an optional namespace field. If specified, it should be
 	// the package name or module name the object is from.
 	Package string
-	
+
 	// Object specifies what type of object it is. For example:
 	//   - TextInput
 	//   - Table
@@ -17,17 +19,24 @@ type Role struct {
 	//   - Dial
 	// This should correspond directly to the type name of the object.
 	Object string
-	
+
 	// Variant is an optional field to be used when an object has one or
 	// more soft variants under one type. For example, an object "Slider"
 	// may have variations "horizontal" and "vertical".
 	Variant string
 }
 
+// String satisfies the fmt.Stringer interface.
+// It follows the format of:
+// Package.Object[Variant]
+func (r Role) String () string {
+	return fmt.Sprintf("%s.%s[%s]", r.Package, r.Object, r.Variant)
+}
+
 // R is shorthand for creating a Role structure.
 func R (pack, object, variant string) Role {
 	return Role { Package: pack, Object: object, Variant: variant }
-} 
+}
 
 // Color represents a color ID.
 type Color int; const (
@@ -38,6 +47,18 @@ type Color int; const (
 	ColorAccent
 )
 
+// String satisfies the fmt.Stringer interface.
+func (c Color) String () string {
+	switch c {
+	case ColorBackground: return "background"
+	case ColorForeground: return "foreground"
+	case ColorRaised:     return "raised"
+	case ColorSunken:     return "sunken"
+	case ColorAccent:     return "accent"
+	default:              return "unknown"
+	}
+}
+
 // RGBA satisfies the color.Color interface.
 func (id Color) RGBA () (r, g, b, a uint32) {
 	if current == nil { return }
@@ -46,28 +67,33 @@ func (id Color) RGBA () (r, g, b, a uint32) {
 
 // Theme is an object that can apply a visual style to different objects.
 type Theme interface {
+	// A word on textures:
+	//
+	// Because textures can be linked to some resource that is outside of
+	// the control of Go's garbage collector, methods of Theme must not
+	// allocate new copies of a texture each time they are called. It is
+	// fine to lazily load textures and save them for later use, but the
+	// same texture must never be allocated multiple times as this could
+	// cause a memory leak.
+	//
+	// As such, textures returned by these methods must be protected.
+	
 	// Apply applies the theme to the given object, according to the given
 	// role. This may register event listeners with the given object;
-	// closing the returned cookie will remove them.
+	// closing the returned cookie must remove them.
 	Apply (tomo.Object, Role) event.Cookie
-	
+
 	// RGBA returns the RGBA values of the corresponding color ID.
 	RGBA (Color) (r, g, b, a uint32)
-	
-	// Icon returns a texture of the corresponding icon ID. This texture
-	// should be protected, unless a new copy of it is returned with each
-	// subsequent call.
-	Icon (Icon, IconSize) tomo.Texture
-	
-	// MimeIcon returns an icon corresponding to a MIME type. This texture
-	// should be protected, unless a new copy of it is returned with each
-	// subsequent call.
-	MimeIcon (data.Mime, IconSize) tomo.Texture
-	
-	// ApplicationIcon returns an icon corresponding to an application. This
-	// texture should be protected, unless a new copy of it is returned with
-	// each subsequent call.
-	ApplicationIcon (ApplicationIcon, IconSize) tomo.Texture
+
+	// Icon returns a texture of the corresponding icon ID.
+	Icon (Icon, IconSize) canvas.Texture
+
+	// MimeIcon returns an icon corresponding to a MIME type.
+	MimeIcon (data.Mime, IconSize) canvas.Texture
+
+	// ApplicationIcon returns an icon corresponding to an application.
+	ApplicationIcon (ApplicationIcon, IconSize) canvas.Texture
 }
 
 var current Theme
@@ -84,4 +110,3 @@ func Apply (object tomo.Object, role Role) event.Cookie {
 	if current == nil { return event.NoCookie { } }
 	return current.Apply(object, role)
 }
-

tomo.go

@@ -3,6 +3,7 @@ package tomo
 import "sync"
 import "image"
 import "errors"
+import "git.tebibyte.media/tomo/tomo/canvas"
 
 var backendLock sync.Mutex
 var backend Backend
@@ -56,6 +57,14 @@ func NewWindow (bounds image.Rectangle) (MainWindow, error) {
 	return backend.NewWindow(bounds)
 }
 
+// NewPlainWindow is like NewWindow, but it creates an undecorated window that
+// does not appear in window lists. It is intended for creating things like
+// docks, panels, etc.
+func NewPlainWindow (bounds image.Rectangle) (MainWindow, error) {
+	assertBackend()
+	return backend.NewPlainWindow(bounds)
+}
+
 // NewBox creates and returns a basic Box.
 func NewBox () Box {
 	assertBackend()
@@ -82,7 +91,7 @@ func NewContainerBox () ContainerBox {
 
 // NewTexture creates a new texture from an image. When no longer in use, it
 // must be freed using Close().
-func NewTexture (source image.Image) Texture {
+func NewTexture (source image.Image) canvas.TextureCloser {
 	assertBackend()
 	return backend.NewTexture(source)
 }

unix.go

@@ -6,6 +6,8 @@ import "os"
 import "strings"
 import "path/filepath"
 
+var userDataDir string
+
 func init () {
 	pathVariable := os.Getenv("TOMO_PLUGIN_PATH")
 	pluginPaths = strings.Split(pathVariable, ":")
@@ -19,4 +21,6 @@ func init () {
 			pluginPaths,
 			filepath.Join(homeDir, ".local/lib/tomo/plugins"))
 	}
+
+	userDataDir = filepath.Join(homeDir, ".local/share")
 }