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https://git.sr.ht/~eliasnaur/gio
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all: rename the gioui.org/ui module to gioui.org
The "ui" is redundant and stutters. Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
@@ -0,0 +1,333 @@
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// SPDX-License-Identifier: Unlicense OR MIT
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package input
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import (
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"encoding/binary"
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"image"
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"gioui.org/ui"
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"gioui.org/f32"
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"gioui.org/internal/opconst"
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"gioui.org/internal/ops"
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"gioui.org/pointer"
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)
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type pointerQueue struct {
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hitTree []hitNode
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areas []areaNode
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handlers map[ui.Key]*pointerHandler
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pointers []pointerInfo
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reader ops.Reader
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scratch []ui.Key
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}
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type hitNode struct {
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next int
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area int
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// Pass tracks the most recent PassOp mode.
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pass bool
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// For handler nodes.
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key ui.Key
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}
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type pointerInfo struct {
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id pointer.ID
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pressed bool
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handlers []ui.Key
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}
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type pointerHandler struct {
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area int
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active bool
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transform ui.TransformOp
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wantsGrab bool
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}
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type areaOp struct {
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kind areaKind
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rect image.Rectangle
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}
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type areaNode struct {
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trans ui.TransformOp
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next int
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area areaOp
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}
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type areaKind uint8
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const (
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areaRect areaKind = iota
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areaEllipse
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)
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func (q *pointerQueue) collectHandlers(r *ops.Reader, events *handlerEvents, t ui.TransformOp, area, node int, pass bool) {
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for encOp, ok := r.Decode(); ok; encOp, ok = r.Decode() {
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switch opconst.OpType(encOp.Data[0]) {
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case opconst.TypePush:
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q.collectHandlers(r, events, t, area, node, pass)
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case opconst.TypePop:
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return
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case opconst.TypePass:
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op := decodePassOp(encOp.Data)
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pass = op.Pass
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case opconst.TypeArea:
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var op areaOp
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op.Decode(encOp.Data)
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q.areas = append(q.areas, areaNode{trans: t, next: area, area: op})
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area = len(q.areas) - 1
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q.hitTree = append(q.hitTree, hitNode{
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next: node,
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area: area,
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pass: pass,
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})
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node = len(q.hitTree) - 1
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case opconst.TypeTransform:
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op := ops.DecodeTransformOp(encOp.Data)
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t = t.Multiply(ui.TransformOp(op))
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case opconst.TypePointerInput:
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op := decodePointerInputOp(encOp.Data, encOp.Refs)
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q.hitTree = append(q.hitTree, hitNode{
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next: node,
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area: area,
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pass: pass,
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key: op.Key,
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})
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node = len(q.hitTree) - 1
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h, ok := q.handlers[op.Key]
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if !ok {
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h = new(pointerHandler)
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q.handlers[op.Key] = h
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events.Set(op.Key, []ui.Event{pointer.Event{Type: pointer.Cancel}})
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}
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h.active = true
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h.area = area
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h.transform = t
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h.wantsGrab = h.wantsGrab || op.Grab
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}
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}
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}
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func (q *pointerQueue) opHit(handlers *[]ui.Key, pos f32.Point) {
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// Track whether we're passing through hits.
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pass := true
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idx := len(q.hitTree) - 1
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for idx >= 0 {
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n := &q.hitTree[idx]
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if !q.hit(n.area, pos) {
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idx--
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continue
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}
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pass = pass && n.pass
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if pass {
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idx--
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} else {
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idx = n.next
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}
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if n.key != nil {
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if _, exists := q.handlers[n.key]; exists {
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*handlers = append(*handlers, n.key)
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}
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}
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}
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}
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func (q *pointerQueue) hit(areaIdx int, p f32.Point) bool {
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for areaIdx != -1 {
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a := &q.areas[areaIdx]
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if !a.hit(p) {
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return false
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}
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areaIdx = a.next
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}
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return true
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}
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func (a *areaNode) hit(p f32.Point) bool {
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p = a.trans.Invert().Transform(p)
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return a.area.Hit(p)
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}
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func (q *pointerQueue) init() {
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if q.handlers == nil {
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q.handlers = make(map[ui.Key]*pointerHandler)
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}
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}
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func (q *pointerQueue) Frame(root *ui.Ops, events *handlerEvents) {
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q.init()
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for _, h := range q.handlers {
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// Reset handler.
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h.active = false
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}
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q.hitTree = q.hitTree[:0]
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q.areas = q.areas[:0]
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q.reader.Reset(root)
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q.collectHandlers(&q.reader, events, ui.TransformOp{}, -1, -1, false)
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for k, h := range q.handlers {
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if !h.active {
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q.dropHandler(k)
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delete(q.handlers, k)
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}
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}
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}
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func (q *pointerQueue) dropHandler(k ui.Key) {
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for i := range q.pointers {
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p := &q.pointers[i]
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for i := len(p.handlers) - 1; i >= 0; i-- {
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if p.handlers[i] == k {
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p.handlers = append(p.handlers[:i], p.handlers[i+1:]...)
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}
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}
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}
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}
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func (q *pointerQueue) Push(e pointer.Event, events *handlerEvents) {
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q.init()
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if e.Type == pointer.Cancel {
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q.pointers = q.pointers[:0]
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for k := range q.handlers {
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q.dropHandler(k)
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}
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return
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}
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pidx := -1
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for i, p := range q.pointers {
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if p.id == e.PointerID {
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pidx = i
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break
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}
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}
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if pidx == -1 {
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q.pointers = append(q.pointers, pointerInfo{id: e.PointerID})
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pidx = len(q.pointers) - 1
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}
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p := &q.pointers[pidx]
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if !p.pressed && (e.Type == pointer.Move || e.Type == pointer.Press) {
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p.handlers, q.scratch = q.scratch[:0], p.handlers
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q.opHit(&p.handlers, e.Position)
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if e.Type == pointer.Press {
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p.pressed = true
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}
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}
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if p.pressed {
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// Resolve grabs.
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q.scratch = q.scratch[:0]
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for i, k := range p.handlers {
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h := q.handlers[k]
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if h.wantsGrab {
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q.scratch = append(q.scratch, p.handlers[:i]...)
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q.scratch = append(q.scratch, p.handlers[i+1:]...)
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break
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}
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}
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// Drop handlers that lost their grab.
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for _, k := range q.scratch {
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q.dropHandler(k)
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}
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}
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if e.Type == pointer.Release {
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q.pointers = append(q.pointers[:pidx], q.pointers[pidx+1:]...)
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}
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for i, k := range p.handlers {
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h := q.handlers[k]
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e := e
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switch {
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case p.pressed && len(p.handlers) == 1:
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e.Priority = pointer.Grabbed
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case i == 0:
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e.Priority = pointer.Foremost
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}
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e.Hit = q.hit(h.area, e.Position)
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e.Position = h.transform.Invert().Transform(e.Position)
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events.Add(k, e)
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if e.Type == pointer.Release {
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// Release grab when the number of grabs reaches zero.
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grabs := 0
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for _, p := range q.pointers {
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if p.pressed && len(p.handlers) == 1 && p.handlers[0] == k {
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grabs++
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}
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}
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if grabs == 0 {
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h.wantsGrab = false
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}
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}
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}
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}
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func (op *areaOp) Decode(d []byte) {
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if opconst.OpType(d[0]) != opconst.TypeArea {
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panic("invalid op")
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}
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bo := binary.LittleEndian
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rect := image.Rectangle{
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Min: image.Point{
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X: int(int32(bo.Uint32(d[2:]))),
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Y: int(int32(bo.Uint32(d[6:]))),
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},
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Max: image.Point{
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X: int(int32(bo.Uint32(d[10:]))),
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Y: int(int32(bo.Uint32(d[14:]))),
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},
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}
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*op = areaOp{
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kind: areaKind(d[1]),
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rect: rect,
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}
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}
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func (op *areaOp) Hit(pos f32.Point) bool {
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min := f32.Point{
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X: float32(op.rect.Min.X),
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Y: float32(op.rect.Min.Y),
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}
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pos = pos.Sub(min)
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size := op.rect.Size()
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switch op.kind {
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case areaRect:
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if 0 <= pos.X && pos.X < float32(size.X) &&
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0 <= pos.Y && pos.Y < float32(size.Y) {
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return true
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} else {
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return false
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}
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case areaEllipse:
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rx := float32(size.X) / 2
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ry := float32(size.Y) / 2
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rx2 := rx * rx
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ry2 := ry * ry
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xh := pos.X - rx
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yk := pos.Y - ry
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if xh*xh*ry2+yk*yk*rx2 <= rx2*ry2 {
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return true
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} else {
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return false
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}
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default:
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panic("invalid area kind")
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}
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}
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func decodePointerInputOp(d []byte, refs []interface{}) pointer.InputOp {
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if opconst.OpType(d[0]) != opconst.TypePointerInput {
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panic("invalid op")
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}
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return pointer.InputOp{
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Grab: d[1] != 0,
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Key: refs[0].(ui.Key),
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}
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}
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func decodePassOp(d []byte) pointer.PassOp {
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if opconst.OpType(d[0]) != opconst.TypePass {
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panic("invalid op")
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}
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return pointer.PassOp{
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Pass: d[1] != 0,
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}
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}
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