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
125 lines
3.0 KiB
Go
125 lines
3.0 KiB
Go
package editor
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import (
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"sync"
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"pad/internal/ui"
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)
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// ConfigEvent represents a window configuration change (resize, orientation).
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// PixelWidth and PixelHeight are the raw pixel dimensions from Gio.
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type ConfigEvent struct {
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PixelWidth int
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PixelHeight int
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}
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// ScaleEvent represents a metric change (HiDPI scale factor).
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type ScaleEvent struct {
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Scale float32
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}
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// ConfigUpdate is a common interface for all configuration updates.
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// Both ConfigEvent and ScaleEvent implement this interface.
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type ConfigUpdate interface {
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apply(*State)
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}
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func (e ConfigEvent) apply(s *State) {
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s.PixelWidth = e.PixelWidth
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s.PixelHeight = e.PixelHeight
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}
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func (e ScaleEvent) apply(s *State) {
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s.SetScale(e.Scale)
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}
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// ResultEvent represents a completed async task result.
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type ResultEvent struct {
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// Future: add result fields here
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}
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// Logic runs the logic goroutine and provides channels for communication.
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type Logic struct {
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state *State
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configChan chan ConfigUpdate
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frameChan chan []ui.Element
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inputChan chan []ui.InputEvent
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lastLineYChan chan int // last line Y (Dp, sent as int) feedback from renderer
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resultChan chan ResultEvent
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mu sync.Mutex
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}
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// NewLogic creates a new Logic instance.
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func NewLogic() *Logic {
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state := NewState()
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TheState = state
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return &Logic{
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state: state,
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configChan: make(chan ConfigUpdate),
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frameChan: make(chan []ui.Element),
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inputChan: make(chan []ui.InputEvent),
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lastLineYChan: make(chan int),
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resultChan: make(chan ResultEvent),
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}
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}
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// ConfigChan returns the unified config channel for the logic goroutine.
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// Accepts ConfigEvent (size) and ScaleEvent (scale factor).
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func (l *Logic) ConfigChan() chan<- ConfigUpdate {
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return l.configChan
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}
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// FrameChan returns the frame channel for the logic goroutine.
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func (l *Logic) FrameChan() <-chan []ui.Element {
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return l.frameChan
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}
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// InputChan returns the input channel for the logic goroutine.
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func (l *Logic) InputChan() chan<- []ui.InputEvent {
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return l.inputChan
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}
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// DisplayLineChan returns the last line Y feedback channel.
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func (l *Logic) DisplayLineChan() chan<- int {
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return l.lastLineYChan
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}
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// ResultChan returns the result channel for the logic goroutine.
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func (l *Logic) ResultChan() chan<- ResultEvent {
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return l.resultChan
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}
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// TheState is the global editor state, set once at startup.
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var TheState *State
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// Scale returns the current scale factor (pixels per DP).
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func (l *Logic) Scale() float32 {
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return l.state.Scale()
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}
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// Run runs the logic goroutine loop.
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func (l *Logic) Run() {
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for {
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select {
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case update := <-l.configChan:
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update.apply(l.state)
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l.frameChan <- l.state.layout()
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case y := <-l.lastLineYChan:
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l.state.LastLineY = ui.Dp(y)
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l.frameChan <- l.state.layout()
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case events := <-l.inputChan:
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for _, evt := range events {
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evt.Handler(evt.Data)
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}
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l.frameChan <- l.state.layout()
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case <-l.resultChan:
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l.frameChan <- l.state.layout()
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}
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}
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}
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// State returns the current state.
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func (l *Logic) State() *State {
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return l.state
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}
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