/
basicui.go
357 lines (298 loc) · 7.19 KB
/
basicui.go
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package uiutil
import (
"fmt"
"image"
"image/draw"
"log"
"sync"
"time"
"github.com/jmigpin/editor/v2/driver"
"github.com/jmigpin/editor/v2/util/syncutil"
"github.com/jmigpin/editor/v2/util/uiutil/event"
"github.com/jmigpin/editor/v2/util/uiutil/mousefilter"
"github.com/jmigpin/editor/v2/util/uiutil/widget"
)
type BasicUI struct {
DrawFrameRate int // frames per second
RootNode widget.Node
Win driver.Window
curCursor event.Cursor
closeOnce sync.Once
eventsQ *syncutil.SyncedQ // linked list queue (unlimited length)
applyEv *widget.ApplyEvent
movef *mousefilter.MoveFilter
clickf *mousefilter.ClickFilter
dragf *mousefilter.DragFilter
pendingPaint bool
lastPaintStart time.Time
}
func NewBasicUI(winName string, root widget.Node) (*BasicUI, error) {
win, err := driver.NewWindow()
if err != nil {
return nil, err
}
req := &event.ReqWindowSetName{winName}
if err := win.Request(req); err != nil {
return nil, err
}
ui := &BasicUI{
DrawFrameRate: 37,
Win: win,
}
ui.eventsQ = syncutil.NewSyncedQ()
ui.applyEv = widget.NewApplyEvent(ui)
ui.initMouseFilters()
// Embed nodes have their wrapper nodes set when they are appended to another node. The root node is not appended to any other node, therefore it needs to be set here.
ui.RootNode = root
root.Embed().SetWrapperForRoot(root)
go ui.eventLoop()
return ui, nil
}
func (ui *BasicUI) initMouseFilters() {
// move filter
isMouseMoveEv := func(ev interface{}) bool {
if wi, ok := ev.(*event.WindowInput); ok {
if _, ok := wi.Event.(*event.MouseMove); ok {
return true
}
}
return false
}
ui.movef = mousefilter.NewMoveFilter(ui.DrawFrameRate, ui.eventsQ.PushBack, isMouseMoveEv)
// click/drag filters
emitFn := func(ev interface{}, p image.Point) {
ui.handleWidgetEv(ev, p)
}
ui.clickf = mousefilter.NewClickFilter(emitFn)
ui.dragf = mousefilter.NewDragFilter(emitFn)
}
//----------
func (ui *BasicUI) Close() {
ui.closeOnce.Do(func() {
req := &event.ReqClose{}
if err := ui.Win.Request(req); err != nil {
log.Println(err)
}
})
}
//----------
func (ui *BasicUI) eventLoop() {
for {
//ui.eventsQ.PushBack(ui.Win.NextEvent()) // slow UI
ev, ok := ui.Win.NextEvent()
if !ok {
break
}
ui.movef.Filter(ev) // sends events to ui.eventsQ.In()
}
}
//----------
// How to use NextEvent():
//
//func SampleEventLoop() {
// defer ui.Close()
// for {
// ev := ui.NextEvent()
// switch t := ev.(type) {
// case error:
// fmt.Println(err)
// case *event.WindowClose:
// return
// default:
// ui.HandleEvent(ev)
// }
// ui.LayoutMarkedAndSchedulePaint()
// }
//}
func (ui *BasicUI) NextEvent() interface{} {
return ui.eventsQ.PopFront()
}
//----------
func (ui *BasicUI) AppendEvent(ev interface{}) {
ui.eventsQ.PushBack(ev)
}
//----------
func (ui *BasicUI) HandleEvent(ev interface{}) (handled bool) {
switch t := ev.(type) {
case *event.WindowResize:
ui.resizeImage(t.Rect)
case *event.WindowExpose:
ui.RootNode.Embed().MarkNeedsPaint()
case *event.WindowInput:
ui.handleWindowInput(t)
case *UIRunFuncEvent:
t.Func()
case *UIPaintTime:
ui.paint()
case struct{}:
// no op, allow layout/schedule funcs to run
default:
return false
}
return true
}
func (ui *BasicUI) handleWindowInput(wi *event.WindowInput) {
ui.handleWidgetEv(wi.Event, wi.Point)
ui.clickf.Filter(wi.Event) // emit events; set on initMouseFilters()
ui.dragf.Filter(wi.Event) // emit events; set on initMouseFilters()
}
func (ui *BasicUI) handleWidgetEv(ev interface{}, p image.Point) {
ui.applyEv.Apply(ui.RootNode, ev, p)
}
//----------
func (ui *BasicUI) LayoutMarkedAndSchedulePaint() {
ui.RootNode.LayoutMarked()
ui.schedulePaintMarked()
}
//----------
func (ui *BasicUI) resizeImage(r image.Rectangle) {
req := &event.ReqImageResize{r}
if err := ui.Win.Request(req); err != nil {
log.Println(err)
return
}
req2 := &event.ReqImage{}
if err := ui.Win.Request(req2); err != nil {
log.Println(err)
return
}
img := req2.ReplyImg
ib := img.Bounds()
en := ui.RootNode.Embed()
if !en.Bounds.Eq(ib) {
en.Bounds = ib
en.MarkNeedsLayout()
en.MarkNeedsPaint()
}
}
//----------
func (ui *BasicUI) schedulePaintMarked() {
if ui.RootNode.Embed().TreeNeedsPaint() {
ui.schedulePaint()
}
}
func (ui *BasicUI) schedulePaint() {
if ui.pendingPaint {
return
}
ui.pendingPaint = true
// schedule
go func() {
d := ui.durationToNextPaint()
if d > 0 {
time.Sleep(d)
}
ui.AppendEvent(&UIPaintTime{})
}()
}
func (ui *BasicUI) durationToNextPaint() time.Duration {
now := time.Now()
frameDur := time.Second / time.Duration(ui.DrawFrameRate)
d := now.Sub(ui.lastPaintStart)
return frameDur - d
}
//----------
func (ui *BasicUI) paint() {
// DEBUG: print fps
now := time.Now()
//d := now.Sub(ui.lastPaintStart)
//fmt.Printf("paint: fps %v\n", int(time.Second/d))
ui.lastPaintStart = now
ui.paintMarked()
}
func (ui *BasicUI) paintMarked() {
ui.pendingPaint = false
u := ui.RootNode.PaintMarked()
r := u.Intersect(ui.Image().Bounds())
if !r.Empty() {
ui.putImage(r)
}
}
func (ui *BasicUI) putImage(r image.Rectangle) {
req := &event.ReqImagePut{r}
if err := ui.Win.Request(req); err != nil {
log.Println(err)
return
}
}
//----------
func (ui *BasicUI) EnqueueNoOpEvent() {
ui.AppendEvent(struct{}{})
}
func (ui *BasicUI) Image() draw.Image {
req := &event.ReqImage{}
if err := ui.Win.Request(req); err != nil {
// dummy img to avoid errors
return image.NewRGBA(image.Rect(0, 0, 1, 1))
}
return req.ReplyImg
}
func (ui *BasicUI) WarpPointer(p image.Point) {
req := &event.ReqPointerWarp{p}
if err := ui.Win.Request(req); err != nil {
log.Println(err)
return
}
}
func (ui *BasicUI) QueryPointer() (image.Point, error) {
req := &event.ReqPointerQuery{}
err := ui.Win.Request(req)
return req.ReplyP, err
}
//----------
// Implements widget.CursorContext
func (ui *BasicUI) SetCursor(c event.Cursor) {
if ui.curCursor == c {
return
}
ui.curCursor = c
req := &event.ReqCursorSet{c}
if err := ui.Win.Request(req); err != nil {
log.Println(err)
return
}
}
//----------
func (ui *BasicUI) GetClipboardData(i event.ClipboardIndex, fn func(string, error)) {
go func() {
req := &event.ReqClipboardDataGet{Index: i}
err := ui.Win.Request(req)
if err != nil {
ui.AppendEvent(fmt.Errorf("getclipboarddata: %w", err))
}
fn(req.ReplyS, err)
}()
}
func (ui *BasicUI) SetClipboardData(i event.ClipboardIndex, s string) {
req := &event.ReqClipboardDataSet{Index: i, Str: s}
if err := ui.Win.Request(req); err != nil {
ui.AppendEvent(fmt.Errorf("setclipboarddata: %w", err))
return
}
}
//----------
func (ui *BasicUI) RunOnUIGoRoutine(f func()) {
ui.AppendEvent(&UIRunFuncEvent{f})
}
// Use with care to avoid UI deadlock (waiting within another wait).
func (ui *BasicUI) WaitRunOnUIGoRoutine(f func()) {
ch := make(chan struct{}, 1)
ui.RunOnUIGoRoutine(func() {
f()
ch <- struct{}{}
})
<-ch
}
// Allows triggering a run of applyevent (ex: useful for cursor update, needs point or it won't work).
func (ui *BasicUI) QueueEmptyWindowInputEvent() {
p, err := ui.QueryPointer()
if err != nil {
return
}
ui.AppendEvent(&event.WindowInput{Point: p})
}
//----------
type UIPaintTime struct{}
type UIRunFuncEvent struct {
Func func()
}