ui: documentation tweaks

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

ui/app/app.go

@@ -13,7 +13,7 @@ import (
 	"gioui.org/ui"
 )
 
-// UpdateEvent is sent when a Window's Update
+// An UpdateEvent is generated when a Window's Update
 // method must be called.
 type UpdateEvent struct {
 	Config Config
@@ -42,7 +42,7 @@ type Insets struct {
 	Top, Bottom, Left, Right ui.Value
 }
 
-// StageEvent is sent whenever the stage of a
+// A StageEvent is generated whenever the stage of a
 // Window changes.
 type StageEvent struct {
 	Stage Stage

ui/input/input.go

@@ -33,6 +33,8 @@ package input
 // Queue maps an event handler key to the events
 // available to the handler.
 type Queue interface {
+	// Next returns the next available event, or
+	// false if none are available.
 	Next(k Key) (Event, bool)
 }
 

ui/key/key.go

@@ -29,13 +29,13 @@ type HandlerOp struct {
 // be hidden.
 type HideInputOp struct{}
 
-// FocusEvent is sent when a handler gains or loses
+// A FocusEvent is generated when a handler gains or loses
 // focus.
 type FocusEvent struct {
 	Focus bool
 }
 
-// Event is sent when a key is pressed. For text input
+// An Event is generated when a key is pressed. For text input
 // use EditEvent.
 type Event struct {
 	// Name is the rune character that most closely
@@ -47,7 +47,7 @@ type Event struct {
 	Modifiers Modifiers
 }
 
-// EditEvent is sent when text is input.
+// An EditEvent is generated when text is input.
 type EditEvent struct {
 	Text string
 }

ui/pointer/pointer.go

@@ -90,8 +90,8 @@ type Source uint8
 type areaKind uint8
 
 const (
-	// Cancel is sent when the current gesture is interrupted
-	// by other handlers or the system.
+	// A Cancel event is generated when the current gesture is
+	// interrupted by other handlers or the system.
 	Cancel Type = iota
 	// Press of a pointer.
 	Press