Revert "gesture: add Active methods to gestures"

This reverts commit d829e56194.

We're not using the activity of gestures to track whether widgets
should behave as disabled or enabled anymore.

gesture/gesture.go

@@ -26,8 +26,6 @@ import (
 type Click struct {
 	// state tracks the gesture state.
 	state ClickState
-
-	activity activity
 }
 
 type ClickState uint8
@@ -55,14 +53,7 @@ type Scroll struct {
 	grab      bool
 	last      int
 	// Leftover scroll.
-	scroll   float32
-	activity activity
-}
-
-// activity tracks whether events have been processed
-// since the previous frame.
-type activity struct {
-	inactive int
+	scroll float32
 }
 
 type ScrollState uint8
@@ -107,10 +98,8 @@ var touchSlop = unit.Dp(3)
 
 // Add the handler to the operation list to receive click events.
 func (c *Click) Add(ops *op.Ops) {
-	c.activity.Frame(ops)
-	if c.activity.Active() {
-		pointer.InputOp{Key: c}.Add(ops)
-	}
+	op := pointer.InputOp{Key: c}
+	op.Add(ops)
 }
 
 // State reports the click state.
@@ -118,15 +107,8 @@ func (c *Click) State() ClickState {
 	return c.state
 }
 
-// Active reports whether Events has been called since the previous
-// Add.
-func (c *Click) Active() bool {
-	return c.activity.Active()
-}
-
 // Events returns the next click event, if any.
 func (c *Click) Events(q event.Queue) []ClickEvent {
-	c.activity.Reset()
 	var events []ClickEvent
 	for _, evt := range q.Events(c) {
 		e, ok := evt.(pointer.Event)
@@ -161,11 +143,8 @@ func (c *Click) Events(q event.Queue) []ClickEvent {
 
 // Add the handler to the operation list to receive scroll events.
 func (s *Scroll) Add(ops *op.Ops) {
-	s.activity.Frame(ops)
-	if !s.activity.Active() {
-		return
-	}
-	pointer.InputOp{Key: s, Grab: s.grab}.Add(ops)
+	oph := pointer.InputOp{Key: s, Grab: s.grab}
+	oph.Add(ops)
 	if s.flinger.Active() {
 		op.InvalidateOp{}.Add(ops)
 	}
@@ -176,16 +155,9 @@ func (s *Scroll) Stop() {
 	s.flinger = fling.Animation{}
 }
 
-// Active reports whether Events has been called since the previous
-// Add.
-func (s *Scroll) Active() bool {
-	return s.activity.Active()
-}
-
 // Scroll detects the scrolling distance from the available events and
 // ongoing fling gestures.
 func (s *Scroll) Scroll(cfg unit.Converter, q event.Queue, t time.Time, axis Axis) int {
-	s.activity.Reset()
 	if s.axis != axis {
 		s.axis = axis
 		return 0
@@ -321,19 +293,3 @@ func (s ScrollState) String() string {
 		panic("unreachable")
 	}
 }
-
-func (a *activity) Frame(ops *op.Ops) {
-	wasActive := a.Active()
-	a.inactive++
-	if a.Active() != wasActive {
-		op.InvalidateOp{}.Add(ops)
-	}
-}
-
-func (a *activity) Active() bool {
-	return a.inactive <= 1
-}
-
-func (a *activity) Reset() {
-	a.inactive = 0
-}