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// Copyright 2015 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
// Package touch defines an event for touch input.
//
// See the golang.org/x/mobile/app package for details on the event model.
package touch
// The best source on android input events is the NDK: include/android/input.h
//
// iOS event handling guide:
// https://developer.apple.com/library/ios/documentation/EventHandling/Conceptual/EventHandlingiPhoneOS
import (
"fmt"
)
// Event is a touch event.
type Event struct {
// X and Y are the touch location, in pixels.
X, Y float32
// Sequence is the sequence number. The same number is shared by all events
// in a sequence. A sequence begins with a single TypeBegin, is followed by
// zero or more TypeMoves, and ends with a single TypeEnd. A Sequence
// distinguishes concurrent sequences but its value is subsequently reused.
Sequence Sequence
// Type is the touch type.
Type Type
}
// Sequence identifies a sequence of touch events.
type Sequence int64
// Type describes the type of a touch event.
type Type byte
const (
// TypeBegin is a user first touching the device.
//
// On Android, this is a AMOTION_EVENT_ACTION_DOWN.
// On iOS, this is a call to touchesBegan.
TypeBegin Type = iota
// TypeMove is a user dragging across the device.
//
// A TypeMove is delivered between a TypeBegin and TypeEnd.
//
// On Android, this is a AMOTION_EVENT_ACTION_MOVE.
// On iOS, this is a call to touchesMoved.
TypeMove
// TypeEnd is a user no longer touching the device.
//
// On Android, this is a AMOTION_EVENT_ACTION_UP.
// On iOS, this is a call to touchesEnded.
TypeEnd
)
func (t Type) String() string {
switch t {
case TypeBegin:
return "begin"
case TypeMove:
return "move"
case TypeEnd:
return "end"
}
return fmt.Sprintf("touch.Type(%d)", t)
}
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