c4654583ad
Change-Id: Ie8392cd6167fca1c0a7f10192824300d7885151d Reviewed-on: https://go-review.googlesource.com/12342 Reviewed-by: David Crawshaw <crawshaw@golang.org>
72 lines
1.8 KiB
Go
72 lines
1.8 KiB
Go
// Copyright 2015 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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// Package touch defines an event for touch input.
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//
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// See the golang.org/x/mobile/app package for details on the event model.
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package touch // import "golang.org/x/mobile/event/touch"
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// The best source on android input events is the NDK: include/android/input.h
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//
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// iOS event handling guide:
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// https://developer.apple.com/library/ios/documentation/EventHandling/Conceptual/EventHandlingiPhoneOS
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import (
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"fmt"
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"golang.org/x/mobile/geom"
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)
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// Event is a touch event.
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//
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// The same Sequence is shared by all events in a sequence. A sequence begins
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// with a single TypeBegin, is followed by zero or more TypeMoves, and ends
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// with a single TypeEnd. A Sequence distinguishes concurrent sequences but its
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// value is subsequently reused.
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type Event struct {
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Sequence Sequence
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Type Type
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Loc geom.Point
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}
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// Sequence identifies a sequence of touch events.
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type Sequence int64
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// Type describes the type of a touch event.
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type Type byte
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const (
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// TypeBegin is a user first touching the device.
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//
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// On Android, this is a AMOTION_EVENT_ACTION_DOWN.
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// On iOS, this is a call to touchesBegan.
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TypeBegin Type = iota
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// TypeMove is a user dragging across the device.
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//
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// A TypeMove is delivered between a TypeBegin and TypeEnd.
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//
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// On Android, this is a AMOTION_EVENT_ACTION_MOVE.
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// On iOS, this is a call to touchesMoved.
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TypeMove
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// TypeEnd is a user no longer touching the device.
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//
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// On Android, this is a AMOTION_EVENT_ACTION_UP.
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// On iOS, this is a call to touchesEnded.
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TypeEnd
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)
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func (t Type) String() string {
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switch t {
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case TypeBegin:
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return "begin"
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case TypeMove:
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return "move"
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case TypeEnd:
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return "end"
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}
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return fmt.Sprintf("touch.Type(%d)", t)
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}
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