X backend conforms to new API

backends/x/event.go

@@ -27,6 +27,8 @@ func (window *Window) handleConfigureNotify (
 	connection *xgbutil.XUtil,
 	event xevent.ConfigureNotifyEvent,
 ) {
+	if window.child == nil { return }
+
 	configureEvent := *event.ConfigureNotifyEvent
 	
 	newWidth  := int(configureEvent.Width)
@@ -66,33 +68,29 @@ func (window *Window) handleKeyPress (
 		NumberPad: numberPad,
 	}
 
-	keyDownEvent := tomo.EventKeyDown {
+	if key == tomo.KeyTab && modifiers.Alt {
-		Key: key,
+		if _, ok := window.child.(tomo.Selectable); ok {
-		Modifiers: modifiers,
+			direction := tomo.SelectionDirectionForward
-		Repeated: false, // FIXME: return correct value here
+			if modifiers.Shift {
-	}
+				direction = tomo.SelectionDirectionBackward
-
-	if keyDownEvent.Key == tomo.KeyTab && keyDownEvent.Modifiers.Alt {
-		if window.child.Selectable() {
-			direction := 1
-			if keyDownEvent.Modifiers.Shift {
-				direction = -1
 			}
 
 			window.advanceSelectionInChild(direction)
 		}
-	} else {
+	} else if child, ok := window.child.(tomo.KeyboardTarget); ok {
-		window.child.Handle(keyDownEvent)
+		// FIXME: pass correct value for repeated
+		child.HandleKeyDown(key, modifiers, false)
 	}
 }
 
-func (window *Window) advanceSelectionInChild (direction int) {
+func (window *Window) advanceSelectionInChild (direction tomo.SelectionDirection) {
-	if window.child.Selected() {
+	child := window.child.(tomo.Selectable)
-		if !window.child.AdvanceSelection(direction) {
+	if child.Selected() {
-			window.child.Handle(tomo.EventDeselect { })
+		if !child.HandleSelection(direction) {
+			child.HandleDeselection()
 		}
 	} else {
-		window.child.Handle(tomo.EventSelect { })
+		child.HandleSelection(tomo.SelectionDirectionNeutral)
 	}
 }