Handle actual X events

backends/x/x.go

@@ -1,8 +1,13 @@
 package x
 
 import "image"
+import "image/color"
+// import "golang.org/x/image/font"
+// import "golang.org/x/image/font/basicfont"
 
+import "github.com/jezek/xgb"
 import "github.com/jezek/xgbutil"
+import "github.com/jezek/xgb/xproto"
 // import "github.com/jezek/xgbutil/ewmh"
 import "github.com/jezek/xgbutil/xevent"
 import "github.com/jezek/xgbutil/xwindow"
@@ -25,12 +30,14 @@ type Backend struct {
 	}
 	
 	metrics struct {
-		cellWidth  int
-		cellHeight int
-		padding    int
-		paddingX   int
-		paddingY   int
-		descent    int
+		windowWidth  int
+		windowHeight int
+		cellWidth    int
+		cellHeight   int
+		padding      int
+		paddingX     int
+		paddingY     int
+		descent      int
 	}
 }
 
@@ -40,6 +47,19 @@ func (backend *Backend) Run (channel chan(stone.Event)) {
 	for {
 		select {
 		case <- backend.ping.before:
+			// if the queue is empty, don't dequeue anything because
+			// it would cause a fucking segfault lmao (???)
+			if !xevent.Empty(backend.connection) {
+				event, err := xevent.Dequeue(backend.connection)
+				if err != nil {
+					// TODO: do something with err
+				}
+
+				if event != nil {
+					backend.handleXEvent(event)
+				}
+			}
+			
 			<- backend.ping.after
 
 		case <- backend.ping.quit:
@@ -57,6 +77,25 @@ func (backend *Backend) SetIcon (icons []image.Image) {
 	
 }
 
+func (backend *Backend) handleXEvent (event xgb.Event) {
+	switch event.(type) {
+	case xproto.ConfigureNotifyEvent:
+		configureEvent := event.(xproto.ConfigureNotifyEvent)
+		
+		newWidth  := int(configureEvent.Width)
+		newHeight := int(configureEvent.Height)
+		sizeChanged :=
+			backend.metrics.windowWidth  != newWidth ||
+			backend.metrics.windowHeight != newHeight
+		backend.metrics.windowWidth  = newWidth
+		backend.metrics.windowHeight = newHeight
+
+		if sizeChanged {
+			// TODO: resize and rebind canvas
+		}
+	}
+}
+
 func (backend *Backend) shutDown () {
 	backend.channel <- stone.EventQuit { }
 }
@@ -96,6 +135,8 @@ func factory (application *stone.Application) (output stone.Backend, err error)
 		backend.metrics.cellHeight
 	backend.metrics.paddingX = backend.metrics.padding
 	backend.metrics.paddingY = backend.metrics.padding
+	backend.metrics.windowWidth,
+	backend.metrics.windowHeight = backend.calculateWindowSize()
 
 	// connect to X
 	backend.connection, err = xgbutil.NewConn()
@@ -104,20 +145,25 @@ func factory (application *stone.Application) (output stone.Backend, err error)
 	if err != nil { return }
 
 	// create the window
-	windowWidth, windowHeight := backend.calculateWindowSize()
 	backend.window.Create (
 		backend.connection.RootWin(),
-		0, 0, windowWidth, windowHeight,
+		0, 0,
+		backend.metrics.windowWidth, backend.metrics.windowHeight,
 		0)
 	backend.window.Map()
+	backend.window.Listen(xproto.EventMaskStructureNotify)
 
 	// create a canvas
 	backend.canvas = xgraphics.New (
 		backend.connection,
 		image.Rect (
 			0, 0,
-			windowWidth,
-			windowHeight))
+			backend.metrics.windowWidth,
+			backend.metrics.windowHeight))
+
+	for i := 8; i < 64; i ++ {
+		backend.canvas.Set(8, i, color.RGBA { R: 0xFF, A: 0xFF })
+	}
 	backend.bindCanvas()
 
 	// attatch graceful close handler