Merge pull request 'redo-event-system' (#1) from redo-event-system into main

Reviewed-on: #1

application.go

@@ -1,6 +1,5 @@
 package stone
 
-import "time"
 import "image/color"
 
 // Application represents an application.
@@ -12,12 +11,6 @@ type Application struct {
 	config Config
 }
 
-// SetSize sets the application's buffer size. This may or may not change the
-// size of the window, depending on the backend used.
-func (application *Application) SetSize (width, height int) {
-	application.DamageBuffer.SetSize(width, height)
-}
-
 // SetTitle sets the application's title. If in a window, it will appear as the
 // window's name.
 func (application *Application) SetTitle (title string) {
@@ -25,12 +18,10 @@ func (application *Application) SetTitle (title string) {
 	application.backend.SetTitle(title)
 }
 
-// Run initializes the application, and then calls callback. Operations inside
+// Run initializes the application, starts it, and then returns a channel that
-// of callback are allowed to interact with the application. Depending on the
+// broadcasts events. If no suitable backend can be found, an error is returned.
-// backend used, this function may bind to the main thread.
+func (application *Application) Run () (
-func (application *Application) Run (
+	channel chan(Event),
-	callback func (application *Application),
-) (
 	err     error,
 ) {
 	// default values for certain parameters
@@ -51,29 +42,10 @@ func (application *Application) Run (
 
 	application.backend, err = instantiateBackend(application)
 	if err != nil { return }
-	application.backend.Run(callback)
 	
-	return
+	channel = make(chan(Event))
-}
+	go application.backend.Run(channel)
 
-// Await blocks until an event is recieved, or until the specified timeout has
-// elapsed. If the timeout is zero, it will wait forever. This function returns
-// true if the backend is still active, and false if it has closed.
-func (application *Application) Await (timeout time.Duration) (keepRunning bool) {
-	keepRunning = application.backend.Await(timeout)
-	return
-}
-
-// Poll updates the window and checks for new events. This function returns true
-// if the backend is still active, and false if it has closed.
-func (application *Application) Poll () (keepRunning bool) {
-	keepRunning = application.backend.Poll()
-	return
-}
-
-// Title returns the application's title.
-func (application *Application) Title () (title string) {
-	title = application.title
 	return
 }
 
@@ -82,41 +54,3 @@ func (application *Application) Config () (config *Config) {
 	config = &application.config
 	return
 }
-
-// JustPressed returns true if the specified button is pressed, but was not
-// pressed the last time events were checked.
-func (application *Application) JustPressed (button Button) (pressed  bool) {
-	pressed = application.backend.JustPressed(button)
-	return
-}
-
-// JustReleased returns true if the specified button
-func (application *Application) JustReleased (button Button) (released bool) {
-	released = application.backend.JustReleased(button)
-	return
-}
-
-func (application *Application) Pressed (button Button) (pressed  bool) {
-	pressed = application.backend.Pressed(button)
-	return
-}
-
-func (application *Application) Repeated (button Button) (repeated bool) {
-	repeated = application.backend.Repeated(button)
-	return
-}
-
-func (application *Application) Typed () (text string) {
-	text = application.backend.Typed()
-	return
-}
-
-func (application *Application) Resized () (resized bool) {
-	resized = application.backend.Resized()
-	return
-}
-
-func (application *Application) MousePosition () (x, y int) {
-	x, y = application.backend.MousePosition()
-	return
-}

backend.go

@@ -1,20 +1,12 @@
 package stone
 
-import "time"
+import "image"
 import "errors"
 
 type Backend interface {
-	Run           (callback func (application *Application)) ()
+	Run      (channel chan(Event))
-	Await         (timeout time.Duration) (keepRunning bool)
-	Poll          ()                      (keepRunning bool)
 	SetTitle (title string)
-	JustPressed   (button Button) (pressed  bool)
+	SetIcon  (icons []image.Image)
-	JustReleased  (button Button) (released bool)
-	Pressed       (button Button) (pressed  bool)
-	Repeated      (button Button) (repeated bool)
-	Typed         () (text    string)
-	Resized       () (resized bool)
-	MousePosition () (x, y int)
 }
 
 type BackendFactory func (application *Application) (backend Backend, err error)

backends/x/x.go

@@ -0,0 +1,127 @@
+package x
+
+import "image"
+
+import "github.com/jezek/xgbutil"
+// import "github.com/jezek/xgbutil/ewmh"
+import "github.com/jezek/xgbutil/xevent"
+import "github.com/jezek/xgbutil/xwindow"
+import "github.com/jezek/xgbutil/xgraphics"
+
+import "git.tebibyte.media/sashakoshka/stone"
+
+type Backend struct {
+	application *stone.Application
+	config      *stone.Config
+	connection  *xgbutil.XUtil
+	window      *xwindow.Window
+	canvas      *xgraphics.Image
+	channel     chan(stone.Event)
+
+	ping struct {
+		before chan(struct { })
+		after  chan(struct { })
+		quit   chan(struct { })
+	}
+	
+	metrics struct {
+		cellWidth  int
+		cellHeight int
+		padding    int
+		paddingX   int
+		paddingY   int
+		descent    int
+	}
+}
+
+func (backend *Backend) Run (channel chan(stone.Event)) {
+	backend.channel = channel
+	
+	for {
+		select {
+		case <- backend.ping.before:
+			<- backend.ping.after
+
+		case <- backend.ping.quit:
+			backend.shutDown()
+			return
+		}
+	}
+}
+
+func (backend *Backend) SetTitle (title string) {
+	
+}
+
+func (backend *Backend) SetIcon (icons []image.Image) {
+	
+}
+
+func (backend *Backend) shutDown () {
+	backend.channel <- stone.EventQuit { }
+}
+
+// calculateWindowSize calculates window bounds based on the internal buffer
+// size.
+func (backend *Backend) calculateWindowSize () (x, y int) {
+	width, height := backend.application.Size()
+	x =
+		width * backend.metrics.cellWidth +
+		backend.metrics.padding * 2
+	y =
+		height * backend.metrics.cellHeight +
+		backend.metrics.padding * 2
+	return
+}
+
+
+// factory instantiates an X backend.
+func factory (application *stone.Application) (output stone.Backend, err error) {
+	backend := &Backend {
+		application: application,
+		config:      application.Config(),
+	}
+
+	// calculate metrics
+	// TODO: base these off of font metrics
+	backend.metrics.cellWidth  = 8
+	backend.metrics.cellHeight = 16
+	backend.metrics.padding =
+		backend.config.Padding() *
+		backend.metrics.cellHeight
+	backend.metrics.paddingX = backend.metrics.padding
+	backend.metrics.paddingY = backend.metrics.padding
+
+	// connect to X
+	backend.connection, err = xgbutil.NewConn()
+	if err != nil { return }
+	backend.window, err = xwindow.Generate(backend.connection)
+	if err != nil { return }
+
+	// create the window
+	windowWidth, windowHeight := backend.calculateWindowSize()
+	backend.window.Create (
+		backend.connection.RootWin(),
+		0, 0, windowWidth, windowHeight,
+		0)
+	backend.window.Map()
+
+	// attatch graceful close handler
+	backend.window.WMGracefulClose (func (window *xwindow.Window) {
+		backend.window.Destroy()
+		backend.shutDown()
+	})
+
+	// start event loop
+	backend.ping.before,
+	backend.ping.after,
+	backend.ping.quit = xevent.MainPing(backend.connection)
+	
+	output = backend
+	return
+}
+
+// init registers this backend when the program starts.
+func init () {
+	stone.RegisterBackend(factory)
+}

event.go

@@ -0,0 +1,12 @@
+package stone
+
+type Event interface { }
+
+type EventQuit      struct { }
+type EventPress     Button
+type EventRelease   Button
+type EventResize    struct { }
+type EventMouseMove struct {
+	X int
+	Y int
+}

examples/hello/main.go

@@ -1,31 +1,25 @@
 package main
 
+import "os"
 import "fmt"
 import "time"
 import "git.tebibyte.media/sashakoshka/stone"
-import _ "git.tebibyte.media/sashakoshka/stone/backends/pixel"
+import _ "git.tebibyte.media/sashakoshka/stone/backends/x"
 
 func main () {
-	application := stone.Application { }
+	application  := &stone.Application { }
-	err := application.Run(run)
+	channel, err := application.Run()
 	if err != nil { panic(err) }
-}
 	
-func run (application *stone.Application) {
 	currentTime := time.Time { }
-	frameDelay  := time.Second / 2
-	textBuffer  := ""
 
 	for {
-		typed := application.Typed()
+		event := <- channel
-		textBuffer += typed
+		switch event.(type) {
+		case stone.EventQuit:
+			os.Exit(0)
 
-		shouldRender :=
+		case stone.EventResize:
-			application.Resized() ||
-			time.Since(currentTime) > frameDelay ||
-			len(typed) > 0
-			
-		if shouldRender {
 			currentTime = time.Now()
 
 			application.ResetDot()
@@ -43,18 +37,6 @@ func run (application *stone.Application) {
 			application.SetRune(5, 1, ':')
 			application.SetRune(6, 1, rune(second / 10 + 48))
 			application.SetRune(7, 1, rune(second % 10 + 48))
-
-			application.Dot.X = 0
-			application.Dot.Y = 2
-			fmt.Fprintln(application, textBuffer)
-
 		}
-
-		if application.Pressed(stone.MouseButtonLeft) {
-			x, y := application.MousePosition()
-			application.SetRune(x, y, '#')
-		}
-		
-		if !application.Await(frameDelay) { break }
 	}
 }

go.mod

@@ -4,14 +4,18 @@ go 1.18
 
 require (
 	github.com/faiface/pixel v0.10.0
+	github.com/jezek/xgbutil v0.0.0-20210302171758-530099784e66
 	golang.org/x/image v0.0.0-20190523035834-f03afa92d3ff
 )
 
 require (
+	github.com/BurntSushi/freetype-go v0.0.0-20160129220410-b763ddbfe298 // indirect
+	github.com/BurntSushi/graphics-go v0.0.0-20160129215708-b43f31a4a966 // indirect
 	github.com/faiface/glhf v0.0.0-20181018222622-82a6317ac380 // indirect
 	github.com/faiface/mainthread v0.0.0-20171120011319-8b78f0a41ae3 // indirect
 	github.com/go-gl/gl v0.0.0-20190320180904-bf2b1f2f34d7 // indirect
 	github.com/go-gl/glfw/v3.3/glfw v0.0.0-20191125211704-12ad95a8df72 // indirect
 	github.com/go-gl/mathgl v0.0.0-20190416160123-c4601bc793c7 // indirect
+	github.com/jezek/xgb v1.1.0 // indirect
 	github.com/pkg/errors v0.8.1 // indirect
 )

go.sum

@@ -1,3 +1,7 @@
+github.com/BurntSushi/freetype-go v0.0.0-20160129220410-b763ddbfe298 h1:1qlsVAQJXZHsaM8b6OLVo6muQUQd4CwkH/D3fnnbHXA=
+github.com/BurntSushi/freetype-go v0.0.0-20160129220410-b763ddbfe298/go.mod h1:D+QujdIlUNfa0igpNMk6UIvlb6C252URs4yupRUV4lQ=
+github.com/BurntSushi/graphics-go v0.0.0-20160129215708-b43f31a4a966 h1:lTG4HQym5oPKjL7nGs+csTgiDna685ZXjxijkne828g=
+github.com/BurntSushi/graphics-go v0.0.0-20160129215708-b43f31a4a966/go.mod h1:Mid70uvE93zn9wgF92A/r5ixgnvX8Lh68fxp9KQBaI0=
 github.com/davecgh/go-spew v1.1.0 h1:ZDRjVQ15GmhC3fiQ8ni8+OwkZQO4DARzQgrnXU1Liz8=
 github.com/davecgh/go-spew v1.1.0/go.mod h1:J7Y8YcW2NihsgmVo/mv3lAwl/skON4iLHjSsI+c5H38=
 github.com/faiface/glhf v0.0.0-20181018222622-82a6317ac380 h1:FvZ0mIGh6b3kOITxUnxS3tLZMh7yEoHo75v3/AgUqg0=
@@ -12,7 +16,12 @@ github.com/go-gl/glfw/v3.3/glfw v0.0.0-20191125211704-12ad95a8df72 h1:b+9H1GAsx5
 github.com/go-gl/glfw/v3.3/glfw v0.0.0-20191125211704-12ad95a8df72/go.mod h1:tQ2UAYgL5IevRw8kRxooKSPJfGvJ9fJQFa0TUsXzTg8=
 github.com/go-gl/mathgl v0.0.0-20190416160123-c4601bc793c7 h1:THttjeRn1iiz69E875U6gAik8KTWk/JYAHoSVpUxBBI=
 github.com/go-gl/mathgl v0.0.0-20190416160123-c4601bc793c7/go.mod h1:yhpkQzEiH9yPyxDUGzkmgScbaBVlhC06qodikEM0ZwQ=
+github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0 h1:DACJavvAHhabrF08vX0COfcOBJRhZ8lUbR+ZWIs0Y5g=
 github.com/golang/freetype v0.0.0-20170609003504-e2365dfdc4a0/go.mod h1:E/TSTwGwJL78qG/PmXZO1EjYhfJinVAhrmmHX6Z8B9k=
+github.com/jezek/xgb v1.1.0 h1:wnpxJzP1+rkbGclEkmwpVFQWpuE2PUGNUzP8SbfFobk=
+github.com/jezek/xgb v1.1.0/go.mod h1:nrhwO0FX/enq75I7Y7G8iN1ubpSGZEiA3v9e9GyRFlk=
+github.com/jezek/xgbutil v0.0.0-20210302171758-530099784e66 h1:+wPhoJD8EH0/bXipIq8Lc2z477jfox9zkXPCJdhvHj8=
+github.com/jezek/xgbutil v0.0.0-20210302171758-530099784e66/go.mod h1:KACeV+k6b+aoLTVrrurywEbu3UpqoQcQywj4qX8aQKM=
 github.com/pkg/errors v0.8.1 h1:iURUrRGxPUNPdy5/HRSm+Yj6okJ6UtLINN0Q9M4+h3I=
 github.com/pkg/errors v0.8.1/go.mod h1:bwawxfHBFNV+L2hUp1rHADufV3IMtnDRdf1r5NINEl0=
 github.com/pmezard/go-difflib v1.0.0 h1:4DBwDE0NGyQoBHbLQYPwSUPoCMWR5BEzIk/f1lZbAQM=