91 lines
2.1 KiB
Go
91 lines
2.1 KiB
Go
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// 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 mouse defines an event for mouse 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 mouse // import "golang.org/x/mobile/event/mouse"
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import (
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"fmt"
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"golang.org/x/mobile/event/key"
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)
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// Event is a mouse event.
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type Event struct {
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// X and Y are the mouse location, in pixels.
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X, Y float32
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// Button is the mouse button being pressed or released. Its value may be
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// zero, for a mouse move or drag without any button change.
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Button Button
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// TODO: have a field to hold what other buttons are down, for detecting
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// drags or button-chords.
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// Modifiers is a bitmask representing a set of modifier keys:
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// key.ModShift, key.ModAlt, etc.
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Modifiers key.Modifiers
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// Direction is the direction of the mouse event: DirPress, DirRelease,
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// or DirNone (for mouse moves or drags).
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Direction Direction
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// TODO: add a Device ID, for multiple input devices?
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// TODO: add a time.Time?
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}
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// Button is a mouse button.
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type Button int32
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// IsWheel reports whether the button is for a scroll wheel.
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func (b Button) IsWheel() bool {
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return b < 0
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}
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// TODO: have a separate axis concept for wheel up/down? How does that relate
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// to joystick events?
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const (
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ButtonNone Button = +0
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ButtonLeft Button = +1
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ButtonMiddle Button = +2
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ButtonRight Button = +3
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ButtonWheelUp Button = -1
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ButtonWheelDown Button = -2
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ButtonWheelLeft Button = -3
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ButtonWheelRight Button = -4
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)
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// Direction is the direction of the mouse event.
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type Direction uint8
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const (
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DirNone Direction = 0
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DirPress Direction = 1
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DirRelease Direction = 2
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// DirStep is a simultaneous press and release, such as a single step of a
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// mouse wheel.
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//
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// Its value equals DirPress | DirRelease.
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DirStep Direction = 3
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)
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func (d Direction) String() string {
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switch d {
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case DirNone:
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return "None"
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case DirPress:
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return "Press"
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case DirRelease:
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return "Release"
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case DirStep:
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return "Step"
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default:
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return fmt.Sprintf("mouse.Direction(%d)", d)
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}
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}
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