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router.go
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router.go
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// SPDX-License-Identifier: Unlicense OR MIT
package input
import (
"image"
"io"
"strings"
"time"
"github.com/utopiagio/gio/f32"
f32internal "github.com/utopiagio/gio/internal/f32"
"github.com/utopiagio/gio/internal/ops"
"github.com/utopiagio/gio/io/clipboard"
"github.com/utopiagio/gio/io/event"
"github.com/utopiagio/gio/io/key"
"github.com/utopiagio/gio/io/pointer"
"github.com/utopiagio/gio/io/semantic"
"github.com/utopiagio/gio/io/system"
"github.com/utopiagio/gio/io/transfer"
"github.com/utopiagio/gio/op"
)
// Router tracks the [io/event.Tag] identifiers of user interface widgets
// and routes events to them. [Source] is its interface exposed to widgets.
type Router struct {
savedTrans []f32.Affine2D
transStack []f32.Affine2D
handlers map[event.Tag]*handler
pointer struct {
queue pointerQueue
collector pointerCollector
}
key struct {
queue keyQueue
// The following fields have the same purpose as the fields in
// type handler, but for key.Events.
filter keyFilter
nextFilter keyFilter
processedFilter keyFilter
scratchFilter keyFilter
}
cqueue clipboardQueue
// states is the list of pending state changes resulting from
// incoming events. The first element, if present, contains the state
// and events for the current frame.
changes []stateChange
reader ops.Reader
// InvalidateCmd summary.
wakeup bool
wakeupTime time.Time
// Changes queued for next call to Frame.
commands []Command
// transfers is the pending transfer.DataEvent.Open functions.
transfers []io.ReadCloser
// deferring is set if command execution and event delivery is deferred
// to the next frame.
deferring bool
// scratchFilters is for garbage-free construction of ephemeral filters.
scratchFilters []taggedFilter
}
// Source implements the interface between a Router and user interface widgets.
// The value Source is disabled.
type Source struct {
r *Router
}
// Command represents a request such as moving the focus, or initiating a clipboard read.
// Commands are queued by calling [Source.Queue].
type Command interface {
ImplementsCommand()
}
// SemanticNode represents a node in the tree describing the components
// contained in a frame.
type SemanticNode struct {
ID SemanticID
ParentID SemanticID
Children []SemanticNode
Desc SemanticDesc
areaIdx int
}
// SemanticDesc provides a semantic description of a UI component.
type SemanticDesc struct {
Class semantic.ClassOp
Description string
Label string
Selected bool
Disabled bool
Gestures SemanticGestures
Bounds image.Rectangle
}
// SemanticGestures is a bit-set of supported gestures.
type SemanticGestures int
const (
ClickGesture SemanticGestures = 1 << iota
ScrollGesture
)
// SemanticID uniquely identifies a SemanticDescription.
//
// By convention, the zero value denotes the non-existent ID.
type SemanticID uint
// SystemEvent is a marker for events that have platform specific
// side-effects. SystemEvents are never matched by catch-all filters.
type SystemEvent struct {
Event event.Event
}
// handler contains the per-handler state tracked by a [Router].
type handler struct {
// active tracks whether the handler was active in the current
// frame. Router deletes state belonging to inactive handlers during Frame.
active bool
pointer pointerHandler
key keyHandler
// filter the handler has asked for through event handling
// in the previous frame. It is used for routing events in the
// current frame.
filter filter
// prevFilter is the filter being built in the current frame.
nextFilter filter
// processedFilter is the filters that have exhausted available events.
processedFilter filter
}
// filter is the union of a set of [io/event.Filters].
type filter struct {
pointer pointerFilter
focusable bool
}
// taggedFilter is a filter for a particular tag.
type taggedFilter struct {
tag event.Tag
filter filter
}
// stateChange represents the new state and outgoing events
// resulting from an incoming event.
type stateChange struct {
// event, if set, is the trigger for the change.
event event.Event
state inputState
events []taggedEvent
}
// inputState represent a immutable snapshot of the state required
// to route events.
type inputState struct {
clipboardState
keyState
pointerState
}
// taggedEvent represents an event and its target handler.
type taggedEvent struct {
event event.Event
tag event.Tag
}
// Source returns a Source backed by this Router.
func (q *Router) Source() Source {
return Source{r: q}
}
// Execute a command.
func (s Source) Execute(c Command) {
if !s.Enabled() {
return
}
s.r.execute(c)
}
// Enabled reports whether the source is enabled. Only enabled
// Sources deliver events and respond to commands.
func (s Source) Enabled() bool {
return s.r != nil
}
// Focused reports whether tag is focused, according to the most recent
// [key.FocusEvent] delivered.
func (s Source) Focused(tag event.Tag) bool {
if !s.Enabled() {
return false
}
return s.r.state().keyState.focus == tag
}
// Event returns the next event that matches at least one of filters.
func (s Source) Event(filters ...event.Filter) (event.Event, bool) {
if !s.Enabled() {
return nil, false
}
return s.r.Event(filters...)
}
func (q *Router) Event(filters ...event.Filter) (event.Event, bool) {
// Merge filters into scratch filters.
q.scratchFilters = q.scratchFilters[:0]
q.key.scratchFilter = q.key.scratchFilter[:0]
for _, f := range filters {
var t event.Tag
switch f := f.(type) {
case key.Filter:
q.key.scratchFilter = append(q.key.scratchFilter, f)
continue
case transfer.SourceFilter:
t = f.Target
case transfer.TargetFilter:
t = f.Target
case key.FocusFilter:
t = f.Target
case pointer.Filter:
t = f.Target
}
if t == nil {
continue
}
var filter *filter
for i := range q.scratchFilters {
s := &q.scratchFilters[i]
if s.tag == t {
filter = &s.filter
break
}
}
if filter == nil {
n := len(q.scratchFilters)
if n < cap(q.scratchFilters) {
// Re-use previously allocated filter.
q.scratchFilters = q.scratchFilters[:n+1]
tf := &q.scratchFilters[n]
tf.tag = t
filter = &tf.filter
filter.Reset()
} else {
q.scratchFilters = append(q.scratchFilters, taggedFilter{tag: t})
filter = &q.scratchFilters[n].filter
}
}
filter.Add(f)
}
for _, tf := range q.scratchFilters {
h := q.stateFor(tf.tag)
h.filter.Merge(tf.filter)
h.nextFilter.Merge(tf.filter)
}
q.key.filter = append(q.key.filter, q.key.scratchFilter...)
q.key.nextFilter = append(q.key.nextFilter, q.key.scratchFilter...)
// Deliver reset event, if any.
for _, f := range filters {
switch f := f.(type) {
case key.FocusFilter:
if f.Target == nil {
break
}
h := q.stateFor(f.Target)
if reset, ok := h.key.ResetEvent(); ok {
return reset, true
}
case pointer.Filter:
if f.Target == nil {
break
}
h := q.stateFor(f.Target)
if reset, ok := h.pointer.ResetEvent(); ok && h.filter.pointer.Matches(reset) {
return reset, true
}
}
}
if !q.deferring {
for i := range q.changes {
change := &q.changes[i]
for j, evt := range change.events {
match := false
switch e := evt.event.(type) {
case key.Event:
match = q.key.scratchFilter.Matches(change.state.keyState.focus, e, false)
default:
for _, tf := range q.scratchFilters {
if evt.tag == tf.tag && tf.filter.Matches(evt.event) {
match = true
break
}
}
}
if match {
change.events = append(change.events[:j], change.events[j+1:]...)
// Fast forward state to last matched.
q.collapseState(i)
return evt.event, true
}
}
}
}
for _, tf := range q.scratchFilters {
h := q.stateFor(tf.tag)
h.processedFilter.Merge(tf.filter)
}
q.key.processedFilter = append(q.key.processedFilter, q.key.scratchFilter...)
return nil, false
}
// collapseState in the interval [1;idx] into q.changes[0].
func (q *Router) collapseState(idx int) {
if idx == 0 {
return
}
first := &q.changes[0]
first.state = q.changes[idx].state
for i := 1; i <= idx; i++ {
first.events = append(first.events, q.changes[i].events...)
}
q.changes = append(q.changes[:1], q.changes[idx+1:]...)
}
// Frame replaces the declared handlers from the supplied
// operation list. The text input state, wakeup time and whether
// there are active profile handlers is also saved.
func (q *Router) Frame(frame *op.Ops) {
var remaining []event.Event
if n := len(q.changes); n > 0 {
if q.deferring {
// Collect events for replay.
for _, ch := range q.changes[1:] {
remaining = append(remaining, ch.event)
}
q.changes = append(q.changes[:0], stateChange{state: q.changes[0].state})
} else {
// Collapse state.
state := q.changes[n-1].state
q.changes = append(q.changes[:0], stateChange{state: state})
}
}
for _, rc := range q.transfers {
if rc != nil {
rc.Close()
}
}
q.transfers = nil
q.deferring = false
for _, h := range q.handlers {
h.filter, h.nextFilter = h.nextFilter, h.filter
h.nextFilter.Reset()
h.processedFilter.Reset()
h.pointer.Reset()
h.key.Reset()
}
q.key.filter, q.key.nextFilter = q.key.nextFilter, q.key.filter
q.key.nextFilter = q.key.nextFilter[:0]
var ops *ops.Ops
if frame != nil {
ops = &frame.Internal
}
q.reader.Reset(ops)
q.collect()
for k, h := range q.handlers {
if !h.active {
delete(q.handlers, k)
} else {
h.active = false
}
}
q.executeCommands()
q.Queue(remaining...)
st := q.lastState()
pst, evts := q.pointer.queue.Frame(q.handlers, st.pointerState)
st.pointerState = pst
st.keyState = q.key.queue.Frame(q.handlers, q.lastState().keyState)
q.changeState(nil, st, evts)
// Collapse state and events.
q.collapseState(len(q.changes) - 1)
}
// Queue events to be routed.
func (q *Router) Queue(events ...event.Event) {
for _, e := range events {
se, system := e.(SystemEvent)
if system {
e = se.Event
}
q.processEvent(e, system)
}
}
func (f *filter) Add(flt event.Filter) {
switch flt := flt.(type) {
case key.FocusFilter:
f.focusable = true
case pointer.Filter:
f.pointer.Add(flt)
case transfer.SourceFilter, transfer.TargetFilter:
f.pointer.Add(flt)
}
}
// Merge f2 into f.
func (f *filter) Merge(f2 filter) {
f.focusable = f.focusable || f2.focusable
f.pointer.Merge(f2.pointer)
}
func (f *filter) Matches(e event.Event) bool {
switch e.(type) {
case key.FocusEvent, key.SnippetEvent, key.EditEvent, key.SelectionEvent:
return f.focusable
default:
return f.pointer.Matches(e)
}
}
func (f *filter) Reset() {
*f = filter{
pointer: pointerFilter{
sourceMimes: f.pointer.sourceMimes[:0],
targetMimes: f.pointer.targetMimes[:0],
},
}
}
func (q *Router) processEvent(e event.Event, system bool) {
state := q.lastState()
switch e := e.(type) {
case pointer.Event:
pstate, evts := q.pointer.queue.Push(q.handlers, state.pointerState, e)
state.pointerState = pstate
q.changeState(e, state, evts)
case key.Event:
var evts []taggedEvent
if q.key.filter.Matches(state.keyState.focus, e, system) {
evts = append(evts, taggedEvent{event: e})
}
q.changeState(e, state, evts)
case key.SnippetEvent:
// Expand existing, overlapping snippet.
if r := state.content.Snippet.Range; rangeOverlaps(r, key.Range(e)) {
if e.Start > r.Start {
e.Start = r.Start
}
if e.End < r.End {
e.End = r.End
}
}
var evts []taggedEvent
if f := state.focus; f != nil {
evts = append(evts, taggedEvent{tag: f, event: e})
}
q.changeState(e, state, evts)
case key.EditEvent, key.FocusEvent, key.SelectionEvent:
var evts []taggedEvent
if f := state.focus; f != nil {
evts = append(evts, taggedEvent{tag: f, event: e})
}
q.changeState(e, state, evts)
case transfer.DataEvent:
cstate, evts := q.cqueue.Push(state.clipboardState, e)
state.clipboardState = cstate
q.changeState(e, state, evts)
default:
panic("unknown event type")
}
}
func (q *Router) execute(c Command) {
// The command can be executed immediately if event delivery is not frozen, and
// no event receiver has completed their event handling.
if !q.deferring {
ch := q.executeCommand(c)
immediate := true
for _, e := range ch.events {
h, ok := q.handlers[e.tag]
immediate = immediate && (!ok || !h.processedFilter.Matches(e.event))
}
if immediate {
// Hold on to the remaining events for state replay.
var evts []event.Event
for _, ch := range q.changes {
if ch.event != nil {
evts = append(evts, ch.event)
}
}
if len(q.changes) > 1 {
q.changes = q.changes[:1]
}
q.changeState(nil, ch.state, ch.events)
q.Queue(evts...)
return
}
}
q.deferring = true
q.commands = append(q.commands, c)
}
func (q *Router) state() inputState {
if len(q.changes) > 0 {
return q.changes[0].state
}
return inputState{}
}
func (q *Router) lastState() inputState {
if n := len(q.changes); n > 0 {
return q.changes[n-1].state
}
return inputState{}
}
func (q *Router) executeCommands() {
for _, c := range q.commands {
ch := q.executeCommand(c)
q.changeState(nil, ch.state, ch.events)
}
q.commands = nil
}
// executeCommand the command and return the resulting state change along with the
// tag the state change depended on, if any.
func (q *Router) executeCommand(c Command) stateChange {
state := q.state()
var evts []taggedEvent
switch req := c.(type) {
case key.SelectionCmd:
state.keyState = q.key.queue.setSelection(state.keyState, req)
case key.FocusCmd:
state.keyState, evts = q.key.queue.Focus(q.handlers, state.keyState, req.Tag)
case key.SoftKeyboardCmd:
state.keyState = state.keyState.softKeyboard(req.Show)
case key.SnippetCmd:
state.keyState = q.key.queue.setSnippet(state.keyState, req)
case transfer.OfferCmd:
state.pointerState, evts = q.pointer.queue.offerData(q.handlers, state.pointerState, req)
case clipboard.WriteCmd:
q.cqueue.ProcessWriteClipboard(req)
case clipboard.ReadCmd:
state.clipboardState = q.cqueue.ProcessReadClipboard(state.clipboardState, req.Tag)
case pointer.GrabCmd:
state.pointerState, evts = q.pointer.queue.grab(state.pointerState, req)
case op.InvalidateCmd:
if !q.wakeup || req.At.Before(q.wakeupTime) {
q.wakeup = true
q.wakeupTime = req.At
}
}
return stateChange{state: state, events: evts}
}
func (q *Router) changeState(e event.Event, state inputState, evts []taggedEvent) {
// Wrap pointer.DataEvent.Open functions to detect them not being called.
for i := range evts {
e := &evts[i]
if de, ok := e.event.(transfer.DataEvent); ok {
transferIdx := len(q.transfers)
data := de.Open()
q.transfers = append(q.transfers, data)
de.Open = func() io.ReadCloser {
q.transfers[transferIdx] = nil
return data
}
e.event = de
}
}
// Initialize the first change to contain the current state
// and events that are bound for the current frame.
if len(q.changes) == 0 {
q.changes = append(q.changes, stateChange{})
}
if e != nil && len(evts) > 0 {
// An event triggered events bound for user receivers. Add a state change to be
// able to redo the change in case of a command execution.
q.changes = append(q.changes, stateChange{event: e, state: state, events: evts})
} else {
// Otherwise, merge with previous change.
prev := &q.changes[len(q.changes)-1]
prev.state = state
prev.events = append(prev.events, evts...)
}
}
func rangeOverlaps(r1, r2 key.Range) bool {
r1 = rangeNorm(r1)
r2 = rangeNorm(r2)
return r1.Start <= r2.Start && r2.Start < r1.End ||
r1.Start <= r2.End && r2.End < r1.End
}
func rangeNorm(r key.Range) key.Range {
if r.End < r.Start {
r.End, r.Start = r.Start, r.End
}
return r
}
func (q *Router) MoveFocus(dir key.FocusDirection) {
state := q.lastState()
kstate, evts := q.key.queue.MoveFocus(q.handlers, state.keyState, dir)
state.keyState = kstate
q.changeState(nil, state, evts)
}
// RevealFocus scrolls the current focus (if any) into viewport
// if there are scrollable parent handlers.
func (q *Router) RevealFocus(viewport image.Rectangle) {
state := q.lastState()
focus := state.focus
if focus == nil {
return
}
kh := &q.handlers[focus].key
bounds := q.key.queue.BoundsFor(kh)
area := q.key.queue.AreaFor(kh)
viewport = q.pointer.queue.ClipFor(area, viewport)
topleft := bounds.Min.Sub(viewport.Min)
topleft = max(topleft, bounds.Max.Sub(viewport.Max))
topleft = min(image.Pt(0, 0), topleft)
bottomright := bounds.Max.Sub(viewport.Max)
bottomright = min(bottomright, bounds.Min.Sub(viewport.Min))
bottomright = max(image.Pt(0, 0), bottomright)
s := topleft
if s.X == 0 {
s.X = bottomright.X
}
if s.Y == 0 {
s.Y = bottomright.Y
}
q.ScrollFocus(s)
}
// ScrollFocus scrolls the focused widget, if any, by dist.
func (q *Router) ScrollFocus(dist image.Point) {
state := q.lastState()
focus := state.focus
if focus == nil {
return
}
kh := &q.handlers[focus].key
area := q.key.queue.AreaFor(kh)
q.changeState(nil, q.lastState(), q.pointer.queue.Deliver(q.handlers, area, pointer.Event{
Kind: pointer.Scroll,
Source: pointer.Touch,
Scroll: f32internal.FPt(dist),
}))
}
func max(p1, p2 image.Point) image.Point {
m := p1
if p2.X > m.X {
m.X = p2.X
}
if p2.Y > m.Y {
m.Y = p2.Y
}
return m
}
func min(p1, p2 image.Point) image.Point {
m := p1
if p2.X < m.X {
m.X = p2.X
}
if p2.Y < m.Y {
m.Y = p2.Y
}
return m
}
func (q *Router) ActionAt(p f32.Point) (system.Action, bool) {
return q.pointer.queue.ActionAt(p)
}
func (q *Router) ClickFocus() {
focus := q.lastState().focus
if focus == nil {
return
}
kh := &q.handlers[focus].key
bounds := q.key.queue.BoundsFor(kh)
center := bounds.Max.Add(bounds.Min).Div(2)
e := pointer.Event{
Position: f32.Pt(float32(center.X), float32(center.Y)),
Source: pointer.Touch,
}
area := q.key.queue.AreaFor(kh)
e.Kind = pointer.Press
state := q.lastState()
q.changeState(nil, state, q.pointer.queue.Deliver(q.handlers, area, e))
e.Kind = pointer.Release
q.changeState(nil, state, q.pointer.queue.Deliver(q.handlers, area, e))
}
// TextInputState returns the input state from the most recent
// call to Frame.
func (q *Router) TextInputState() TextInputState {
state := q.state()
kstate, s := state.InputState()
state.keyState = kstate
q.changeState(nil, state, nil)
return s
}
// TextInputHint returns the input mode from the most recent key.InputOp.
func (q *Router) TextInputHint() (key.InputHint, bool) {
return q.key.queue.InputHint(q.handlers, q.state().keyState)
}
// WriteClipboard returns the most recent content to be copied
// to the clipboard, if any.
func (q *Router) WriteClipboard() (mime string, content []byte, ok bool) {
return q.cqueue.WriteClipboard()
}
// ClipboardRequested reports if any new handler is waiting
// to read the clipboard.
func (q *Router) ClipboardRequested() bool {
return q.cqueue.ClipboardRequested(q.lastState().clipboardState)
}
// Cursor returns the last cursor set.
func (q *Router) Cursor() pointer.Cursor {
return q.state().cursor
}
// SemanticAt returns the first semantic description under pos, if any.
func (q *Router) SemanticAt(pos f32.Point) (SemanticID, bool) {
return q.pointer.queue.SemanticAt(pos)
}
// AppendSemantics appends the semantic tree to nodes, and returns the result.
// The root node is the first added.
func (q *Router) AppendSemantics(nodes []SemanticNode) []SemanticNode {
q.pointer.collector.q = &q.pointer.queue
q.pointer.collector.ensureRoot()
return q.pointer.queue.AppendSemantics(nodes)
}
// EditorState returns the editor state for the focused handler, or the
// zero value if there is none.
func (q *Router) EditorState() EditorState {
return q.key.queue.editorState(q.handlers, q.state().keyState)
}
func (q *Router) stateFor(tag event.Tag) *handler {
if tag == nil {
panic("internal error: nil tag")
}
s, ok := q.handlers[tag]
if !ok {
s = new(handler)
if q.handlers == nil {
q.handlers = make(map[event.Tag]*handler)
}
q.handlers[tag] = s
}
s.active = true
return s
}
func (q *Router) collect() {
q.transStack = q.transStack[:0]
pc := &q.pointer.collector
pc.q = &q.pointer.queue
pc.Reset()
kq := &q.key.queue
q.key.queue.Reset()
var t f32.Affine2D
for encOp, ok := q.reader.Decode(); ok; encOp, ok = q.reader.Decode() {
switch ops.OpType(encOp.Data[0]) {
case ops.TypeSave:
id := ops.DecodeSave(encOp.Data)
if extra := id - len(q.savedTrans) + 1; extra > 0 {
q.savedTrans = append(q.savedTrans, make([]f32.Affine2D, extra)...)
}
q.savedTrans[id] = t
case ops.TypeLoad:
id := ops.DecodeLoad(encOp.Data)
t = q.savedTrans[id]
pc.resetState()
pc.setTrans(t)
case ops.TypeClip:
var op ops.ClipOp
op.Decode(encOp.Data)
pc.clip(op)
case ops.TypePopClip:
pc.popArea()
case ops.TypeTransform:
t2, push := ops.DecodeTransform(encOp.Data)
if push {
q.transStack = append(q.transStack, t)
}
t = t.Mul(t2)
pc.setTrans(t)
case ops.TypePopTransform:
n := len(q.transStack)
t = q.transStack[n-1]
q.transStack = q.transStack[:n-1]
pc.setTrans(t)
case ops.TypeInput:
tag := encOp.Refs[0].(event.Tag)
s := q.stateFor(tag)
pc.inputOp(tag, &s.pointer)
a := pc.currentArea()
b := pc.currentAreaBounds()
if s.filter.focusable {
kq.inputOp(tag, &s.key, t, a, b)
}
// Pointer ops.
case ops.TypePass:
pc.pass()
case ops.TypePopPass:
pc.popPass()
case ops.TypeCursor:
name := pointer.Cursor(encOp.Data[1])
pc.cursor(name)
case ops.TypeActionInput:
act := system.Action(encOp.Data[1])
pc.actionInputOp(act)
case ops.TypeKeyInputHint:
op := key.InputHintOp{
Tag: encOp.Refs[0].(event.Tag),
Hint: key.InputHint(encOp.Data[1]),
}
s := q.stateFor(op.Tag)
s.key.inputHint(op.Hint)
// Semantic ops.
case ops.TypeSemanticLabel:
lbl := *encOp.Refs[0].(*string)
pc.semanticLabel(lbl)
case ops.TypeSemanticDesc:
desc := *encOp.Refs[0].(*string)
pc.semanticDesc(desc)
case ops.TypeSemanticClass:
class := semantic.ClassOp(encOp.Data[1])
pc.semanticClass(class)
case ops.TypeSemanticSelected:
if encOp.Data[1] != 0 {
pc.semanticSelected(true)
} else {
pc.semanticSelected(false)
}
case ops.TypeSemanticEnabled:
if encOp.Data[1] != 0 {
pc.semanticEnabled(true)
} else {
pc.semanticEnabled(false)
}
}
}
}
// WakeupTime returns the most recent time for doing another frame,
// as determined from the last call to Frame.
func (q *Router) WakeupTime() (time.Time, bool) {
t, w := q.wakeupTime, q.wakeup
q.wakeup = false
// Pending events always trigger wakeups.
if len(q.changes) > 1 || len(q.changes) == 1 && len(q.changes[0].events) > 0 {
t, w = time.Time{}, true
}
return t, w
}
func (s SemanticGestures) String() string {
var gestures []string
if s&ClickGesture != 0 {
gestures = append(gestures, "Click")
}
return strings.Join(gestures, ",")
}
func (SystemEvent) ImplementsEvent() {}