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|
// SPDX-License-Identifier: Unlicense OR MIT
package pointer
import (
"encoding/binary"
"image"
"strings"
"time"
"gioui.org/f32"
"gioui.org/internal/opconst"
"gioui.org/io/event"
"gioui.org/io/key"
"gioui.org/op"
)
// Event is a pointer event.
type Event struct {
Type Type
Source Source
// PointerID is the id for the pointer and can be used
// to track a particular pointer from Press to
// Release or Cancel.
PointerID ID
// Priority is the priority of the receiving handler
// for this event.
Priority Priority
// Time is when the event was received. The
// timestamp is relative to an undefined base.
Time time.Duration
// Buttons are the set of pressed mouse buttons for this event.
Buttons Buttons
// Position is the position of the event, relative to
// the current transformation, as set by op.TransformOp.
Position f32.Point
// Scroll is the scroll amount, if any.
Scroll f32.Point
// Modifiers is the set of active modifiers when
// the mouse button was pressed.
Modifiers key.Modifiers
}
// AreaOp updates the hit area to the intersection of the current
// hit area and the area. The area is transformed before applying
// it.
type AreaOp struct {
kind areaKind
rect image.Rectangle
}
// InputOp declares an input handler ready for pointer
// events.
type InputOp struct {
Tag event.Tag
// Grab, if set, request that the handler get
// Grabbed priority.
Grab bool
// Types is a bitwise-or of event types to receive.
Types Type
}
// PassOp sets the pass-through mode.
type PassOp struct {
Pass bool
}
type ID uint16
// Type of an Event.
type Type uint8
// Priority of an Event.
type Priority uint8
// Source of an Event.
type Source uint8
// Buttons is a set of mouse buttons
type Buttons uint8
// Must match app/internal/input.areaKind
type areaKind uint8
const (
// A Cancel event is generated when the current gesture is
// interrupted by other handlers or the system.
Cancel Type = (1 << iota) >> 1
// Press of a pointer.
Press
// Release of a pointer.
Release
// Move of a pointer.
Move
// Drag of a pointer.
Drag
// Pointer enters an area watching for pointer input
Enter
// Pointer leaves an area watching for pointer input
Leave
// Scroll of a pointer.
Scroll
)
const (
// Mouse generated event.
Mouse Source = iota
// Touch generated event.
Touch
)
const (
// Shared priority is for handlers that
// are part of a matching set larger than 1.
Shared Priority = iota
// Foremost priority is like Shared, but the
// handler is the foremost of the matching set.
Foremost
// Grabbed is used for matching sets of size 1.
Grabbed
)
const (
ButtonLeft Buttons = 1 << iota
ButtonRight
ButtonMiddle
)
const (
areaRect areaKind = iota
areaEllipse
)
// Rect constructs a rectangular hit area.
func Rect(size image.Rectangle) AreaOp {
return AreaOp{
kind: areaRect,
rect: size,
}
}
// Ellipse constructs an ellipsoid hit area.
func Ellipse(size image.Rectangle) AreaOp {
return AreaOp{
kind: areaEllipse,
rect: size,
}
}
func (op AreaOp) Add(o *op.Ops) {
data := o.Write(opconst.TypeAreaLen)
data[0] = byte(opconst.TypeArea)
data[1] = byte(op.kind)
bo := binary.LittleEndian
bo.PutUint32(data[2:], uint32(op.rect.Min.X))
bo.PutUint32(data[6:], uint32(op.rect.Min.Y))
bo.PutUint32(data[10:], uint32(op.rect.Max.X))
bo.PutUint32(data[14:], uint32(op.rect.Max.Y))
}
func (h InputOp) Add(o *op.Ops) {
data := o.Write(opconst.TypePointerInputLen, h.Tag)
data[0] = byte(opconst.TypePointerInput)
if h.Grab {
data[1] = 1
}
data[2] = byte(h.Types)
}
func (op PassOp) Add(o *op.Ops) {
data := o.Write(opconst.TypePassLen)
data[0] = byte(opconst.TypePass)
if op.Pass {
data[1] = 1
}
}
func (t Type) String() string {
switch t {
case Press:
return "Press"
case Release:
return "Release"
case Cancel:
return "Cancel"
case Move:
return "Move"
case Drag:
return "Drag"
case Enter:
return "Enter"
case Leave:
return "Leave"
case Scroll:
return "Scroll"
default:
panic("unknown Type")
}
}
func (p Priority) String() string {
switch p {
case Shared:
return "Shared"
case Foremost:
return "Foremost"
case Grabbed:
return "Grabbed"
default:
panic("unknown priority")
}
}
func (s Source) String() string {
switch s {
case Mouse:
return "Mouse"
case Touch:
return "Touch"
default:
panic("unknown source")
}
}
// Contain reports whether the set b contains
// all of the buttons.
func (b Buttons) Contain(buttons Buttons) bool {
return b&buttons == buttons
}
func (b Buttons) String() string {
var strs []string
if b.Contain(ButtonLeft) {
strs = append(strs, "ButtonLeft")
}
if b.Contain(ButtonRight) {
strs = append(strs, "ButtonRight")
}
if b.Contain(ButtonMiddle) {
strs = append(strs, "ButtonMiddle")
}
return strings.Join(strs, "|")
}
func (Event) ImplementsEvent() {}
|
