widget,widget/material: rename widget.Click to widget.Press

Press tracks pointer presses, not clicks, and we're about to add a Click
type that does.

Signed-off-by: Elias Naur <mail@eliasnaur.com>

widget/bool.go

@@ -8,7 +8,7 @@ import (
 type Bool struct {
 	Value bool
 	// Last is the last registered click.
-	Last Click
+	Last Press
 
 	// changeVal tracks Value from the most recent call to Changed.
 	changeVal bool
@@ -28,7 +28,7 @@ func (b *Bool) Layout(gtx layout.Context) {
 	for _, e := range b.gesture.Events(gtx) {
 		switch e.Type {
 		case gesture.TypeClick:
-			b.Last = Click{
+			b.Last = Press{
 				Time:     gtx.Now(),
 				Position: e.Position,
 			}

widget/button.go

@@ -18,11 +18,11 @@ type Clickable struct {
 	click gesture.Click
 	// clicks tracks the number of unreported clicks.
 	clicks  int
-	history []Click
+	history []Press
 }
 
-// Click represents a past click.
+// Press represents a past pointer press.
-type Click struct {
+type Press struct {
 	Position f32.Point
 	Time     time.Time
 }
@@ -39,7 +39,7 @@ func (b *Clickable) Clicked() bool {
 
 // History is the past pointer presses useful for drawing markers.
 // History is retained for a short duration (about a second).
-func (b *Clickable) History() []Click {
+func (b *Clickable) History() []Press {
 	return b.history
 }
 
@@ -68,7 +68,7 @@ func (b *Clickable) update(gtx layout.Context) {
 		case gesture.TypeClick:
 			b.clicks++
 		case gesture.TypePress:
-			b.history = append(b.history, Click{
+			b.history = append(b.history, Press{
 				Position: e.Position,
 				Time:     gtx.Now(),
 			})

widget/material/button.go

@@ -180,7 +180,7 @@ func (b IconButtonStyle) Layout(gtx layout.Context) layout.Dimensions {
 	)
 }
 
-func drawInk(gtx layout.Context, c widget.Click) {
+func drawInk(gtx layout.Context, c widget.Press) {
 	d := gtx.Now().Sub(c.Time)
 	t := float32(d.Seconds())
 	const duration = 0.5