Propagate keyboard events to root if nothing is focused

This makes window-level keybinds possible. Exciting!

internal/system/event.go

@@ -24,13 +24,19 @@ func (this *Hierarchy) HandleModifiers (modifiers input.Modifiers) {
 // HandleModifiers must be called *before* HandleKeyDown.
 func (this *Hierarchy) HandleKeyDown (key input.Key, numberPad bool) {
 	caught := false
-	this.keyboardTargets(func (target anyBox) bool {
-		if target.handleKeyDown(key, numberPad) {
-			caught = true
-			return false
+	if this.anyFocused() {
+		this.keyboardTargets(func (target anyBox) bool {
+			if target.handleKeyDown(key, numberPad) {
+				caught = true
+				return false
+			}
+			return true
+		})
+	} else {
+		if this.root != nil {
+			caught = this.root.handleKeyDown(key, numberPad)
 		}
-		return true
-	})
+	}
 	if caught { return }
 
 	switch key {
@@ -49,12 +55,18 @@ func (this *Hierarchy) HandleKeyDown (key input.Key, numberPad bool) {
 // which triggers this comes with modifier key information, HandleModifiers must
 // be called *before* HandleKeyUp.
 func (this *Hierarchy) HandleKeyUp (key input.Key, numberPad bool) {
-	this.keyboardTargets(func (target anyBox) bool {
-		if target.handleKeyUp(key, numberPad) {
-			return false
+	if this.anyFocused() {
+		this.keyboardTargets(func (target anyBox) bool {
+			if target.handleKeyUp(key, numberPad) {
+				return false
+			}
+			return true
+		})
+	} else {
+		if this.root != nil {
+			this.root.handleKeyUp(key, numberPad)
 		}
-		return true
-	})
+	}
 }
 
 // HandleMouseDown sends a mouse down event to the Boxes positioned underneath