Greg Pomerantz
0246316d8f
- Renderer computes word wrap via single LayoutString pass with
WrapHeuristically policy; glyphs drawn inline at FlagLineBreak
- Fixed line height (fontSize * 1.2), independent of glyph metrics
- Two-finger trackpad scroll via gesture.Scroll with vertical axis
- Display line feedback: renderer reports last glyph Y after each
Draw; logic uses it to clamp scroll offset so last line stops
at bottom of viewport with lineHeight/2 padding
- ScrollRange fix: {Min: -(1<<30), Max: 1<<30} ensures scroll
delta is consumed (empty range consumes nothing via clampSplit)
- Line counting fix: only FlagLineBreak increments count; buffer
flushes (32-glyph cap) draw but don't count
80 lines
1.7 KiB
Go
80 lines
1.7 KiB
Go
package main
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import (
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"log"
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"os"
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"sync"
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"gioui.org/app"
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"gioui.org/op"
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"gioui.org/text"
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"gioui.org/unit"
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"gioui.org/font/gofont"
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"pad/internal/editor"
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"pad/internal/ui"
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)
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func main() {
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go func() {
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w := new(app.Window)
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w.Option(app.Title("Pad"))
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w.Option(app.Size(unit.Dp(390), unit.Dp(844)))
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if err := run(w); err != nil {
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log.Fatal(err)
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}
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os.Exit(0)
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}()
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app.Main()
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}
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func run(w *app.Window) error {
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var ops op.Ops
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shaper := text.NewShaper(text.WithCollection(gofont.Collection()))
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logic := editor.NewLogic()
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renderer := ui.New(ui.Theme{FontSize: 14}, shaper, logic.State())
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var mu sync.Mutex
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var elems []ui.Element
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go logic.Run()
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go frameReceiver(w, &mu, &elems, logic.FrameChan())
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for {
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switch e := w.Event().(type) {
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case app.DestroyEvent:
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return e.Err
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case app.ConfigEvent:
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// ConfigEvent: raw pixel dimensions only.
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logic.ConfigChan() <- editor.ConfigEvent{
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PixelWidth: e.Config.Size.X,
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PixelHeight: e.Config.Size.Y,
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}
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case app.FrameEvent:
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gtx := app.NewContext(&ops, e)
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newScale := gtx.Metric.PxPerDp
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curScale := logic.State().Scale()
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if newScale != curScale {
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logic.ConfigChan() <- editor.ScaleEvent{newScale}
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}
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mu.Lock()
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currentElems := elems
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renderer.Draw(gtx, currentElems)
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logic.DisplayLineChan() <- int(renderer.LastLineY())
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if events := renderer.CheckGestures(e.Source, gtx.Metric); len(events) > 0 {
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logic.InputChan() <- events
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}
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e.Frame(&ops)
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mu.Unlock()
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}
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}
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}
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func frameReceiver(w *app.Window, mu *sync.Mutex, elems *[]ui.Element, frameChan <-chan []ui.Element) {
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for {
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frame := <-frameChan
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mu.Lock()
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*elems = frame
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w.Invalidate()
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mu.Unlock()
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}
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}
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