Greg Pomerantz
6dedffcba7
Tapping in the editor repositions the cursor, but it was never actually verified (the old unit test only checked in-bounds/no-panic). On-device verification found that on a large file scrolled deep, the cursor clamped to the bottom of the viewport regardless of tap position. Root cause: the tap handler computed the tap's text-local Y in content space (pt.Y - region.Y + full ScrollOffset) and passed it to SetCursorFromPoint, whose visualLine = y/lineHeight then produced a huge content-line number (e.g. 91,640). But the GlyphLayout is window-relative (layout.Y==0 is the top of the visible window), so the number far exceeded the window's line count and clamped to the last group (bottom line). The Phase 3 windowing refactor introduced the windowed layout without updating the tap handler. Fix: tapLocalY() converts the tap Y to window-relative space by adding only the sub-line remainder (ScrollOffset mod lineHeight), never the full scroll. Extracted as a named helper so it is unit-testable. Added two regression tests that fail on the pre-fix formula (cursor clamps to the bottom line) and pass on the fix. Verified on-device: taps now map linearly across the viewport. Also removed the per-tap/per-glyph log.Printf debug lines in SetCursorFromPoint.
1138 lines
35 KiB
Go
1138 lines
35 KiB
Go
package editor
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import (
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"fmt"
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"log"
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"math"
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"sort"
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"time"
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"unicode/utf8"
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"gioui.org/io/key"
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"pad/internal/browser"
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"pad/internal/ui"
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)
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// EditorFontSize is the font size used for editor text.
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const EditorFontSize = 14 // unit.Sp
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// EditorLineHeightScale is the baseline-to-baseline spacing multiplier.
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const EditorLineHeightScale = 1.2
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// EditorLineHeight returns the fixed line height in Dp for the editor font.
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func EditorLineHeight() ui.Dp {
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return ui.Dp(float32(EditorFontSize) * EditorLineHeightScale)
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}
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// formatSize renders a byte count as a human-readable size (e.g. "10.4 MB").
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func formatSize(n int64) string {
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const unit = 1024
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if n < unit {
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return fmt.Sprintf("%d B", n)
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}
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div, exp := int64(unit), 0
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for m := n / unit; m >= unit; m /= unit {
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div *= unit
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exp++
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}
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return fmt.Sprintf("%.1f %cB", float64(n)/float64(div), "kMG"[exp])
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}
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// Page identifies which page the app is showing.
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type Page int
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const (
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BrowserPage Page = iota
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EditorPage
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)
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// SortMode controls how the browser list is sorted.
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type SortMode int
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const (
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SortByDateDesc SortMode = iota // default: newest first
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SortByDateAsc
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SortByNameAsc
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SortByNameDesc
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)
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// EditorState holds all editor-specific state.
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type EditorState struct {
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Buffer string // DEPRECATED: use ChunkedBuffer for large files
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ChunkedBuffer *ChunkedBuffer // NEW: chunked file access for virtual scrolling
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CursorPosition int
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GlyphLayout ui.GlyphLayout
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SelectionStart int
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SelectionEnd int
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CursorVisible bool
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// IMEWindowStartByte is the absolute byte offset in the buffer where the
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// visible window (IMEWindowText) begins. For small (string) files it is 0
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// and the window is the whole buffer; for large (chunked) files it is the
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// viewport start. The IME snippet is the window, so an EditEvent.Range is
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// relative to the window and must be offset by this to address the buffer.
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IMEWindowStartByte int
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// IMEWindowText is the visible window text shown to the IME (the snippet).
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// It is set during layout and is what an EditEvent.Range indexes into.
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IMEWindowText string
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Filename string
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// TooLarge is set when an opened file exceeds MaxEditableFileSize. The
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// editor shows a "too large to edit" notice instead of content (the
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// browser can still list the file).
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TooLarge bool
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TooLargeSize int64
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fileVersion map[string]int
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lastWriteVersion map[string]int
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saveTimer *time.Timer
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writeFailed map[string]bool // Added: tracks failed writes for UI
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retryAttempts map[string]int // Added: tracks retry attempts
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}
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// GetBuffer returns the full buffer content, using ChunkedBuffer if available.
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func (e *EditorState) GetBuffer() string {
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if e.ChunkedBuffer != nil {
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fullContent, err := e.ChunkedBuffer.FullContent()
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if err != nil {
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log.Printf("Error getting full buffer content: %v", err)
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return ""
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}
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return fullContent
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}
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return e.Buffer
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}
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// IsSaving returns true if a save is pending.
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func (e *EditorState) IsSaving() bool {
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return e.saveTimer != nil
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}
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// IsDirty, WriteFailed, and RetryAttempts are computed:
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func (e *EditorState) IsDirty() bool {
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bufVer := e.fileVersion[e.Filename]
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writeVer := e.lastWriteVersion[e.Filename]
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return bufVer > writeVer
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}
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func (e *EditorState) WriteFailed() bool {
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return e.writeFailed[e.Filename]
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}
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// SetWriteFailed is used by the logic goroutine to update status.
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func (e *EditorState) SetWriteFailed(filename string, failed bool) {
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e.writeFailed[filename] = failed
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if !failed {
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e.retryAttempts[filename] = 0 // Reset attempts on success
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}
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}
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// IncrementRetryAttempts increments the attempt counter for a file.
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func (e *EditorState) IncrementRetryAttempts(filename string) int {
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e.retryAttempts[filename]++
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return e.retryAttempts[filename]
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}
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// State holds all application state owned by the logic goroutine.
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type State struct {
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PixelWidth int // raw pixel width from Gio ConfigEvent
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PixelHeight int // raw pixel height from Gio ConfigEvent
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scale float32
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page Page // current page (Browser or Editor)
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WordWrap bool
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ScrollOffset ui.Dp // vertical scroll position in Dp
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ByteOffset int // Byte offset of the first visible line
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LastLineY ui.Dp // last line baseline offset from text origin, from renderer
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MaxScroll ui.Dp // max scroll offset (content height - viewport height)
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// VisibleStart/VisibleEnd are the byte range the last editor layout shaped
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// for the viewport. Set by EditorLayout each frame; read by the profiler
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// probe to confirm the shaped range stays viewport-bounded (not the file).
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VisibleStart int
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VisibleEnd int
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FocusedElementID string // ID of the currently focused element
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Elems []ui.Element
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lastEvictionTime time.Time // Throttles chunk eviction
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justOpenedAt time.Time // when the editor page was last opened; used to swallow the opening tap
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// Browser state (directly embedded per architecture §8)
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Browser browser.BrowserState // Embedded, not a pointer
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// Editor state
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Editor EditorState // New field
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open func(string)
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}
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func NewState() *State {
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return &State{
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scale: 1.0,
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page: BrowserPage, // Reverted to BrowserPage
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WordWrap: true, // Enable word wrap by default
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lastEvictionTime: time.Now(),
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Browser: *browser.NewBrowserState(),
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Editor: EditorState{
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CursorPosition: 0,
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SelectionStart: -1,
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SelectionEnd: -1,
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fileVersion: make(map[string]int),
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lastWriteVersion: make(map[string]int),
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writeFailed: make(map[string]bool),
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retryAttempts: make(map[string]int),
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},
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}
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}
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func (s *State) SetScale(scale float32) {
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s.scale = scale
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}
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func (s *State) Scale() float32 {
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return s.scale
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}
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// layout converts stored pixel dimensions to Dp using the current scale
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// and computes the element tree. Called only when a frame is needed.
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// Search query sync is handled by the logic goroutine via searchQueryChan,
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// not here, to ensure proper channel-based state flow.
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func (s *State) layout(bm *browser.BrowserManager) []ui.Element {
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dpW := ui.ToDp(ui.Px(s.PixelWidth), s.scale)
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dpH := ui.ToDp(ui.Px(s.PixelHeight), s.scale)
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// Calculate VisibleCount before laying out the browser page.
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// This ensures the browser shows entries based on the current viewport.
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if s.PixelHeight > 0 && s.scale > 0 {
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listAreaHeight := dpH - ui.Dp(10+24+5+36+5+10)
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rowHeight := ui.Dp(48)
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newVisibleCount := int(listAreaHeight / rowHeight)
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if newVisibleCount > 0 && newVisibleCount != s.Browser.VisibleCount {
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s.Browser.VisibleCount = newVisibleCount
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}
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}
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switch s.page {
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case BrowserPage:
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tapHandler := func(data any) {
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if idx, ok := data.(int); ok {
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browser.HandleBrowserTap(bm, &s.Browser, idx)
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}
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}
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s.Elems = browser.BrowserLayout(dpW, dpH, &s.Browser, ToggleSortOrder, tapHandler)
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case EditorPage:
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s.Elems = EditorLayout(dpW, dpH, s.WordWrap)
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}
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return s.Elems
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}
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// ToggleWordWrap toggles the word wrap setting.
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func ToggleWordWrap(data any) {
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TheState.WordWrap = !TheState.WordWrap
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}
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// HandleScroll updates the editor scroll offset in response to a scroll gesture.
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// The delta is in pixels (from gesture.Scroll.Update). Convert to Dp.
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// Clamped to [0, MaxScroll] so content doesn't scroll past its ends.
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// Also evicts chunks far from the cursor to keep memory bounded.
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func HandleScroll(data any) {
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// Swallow scroll from the opening gesture: the tap that opened the file can
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// leak a scroll delta into the editor before the line index is built (when
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// MaxScroll is a large estimate), leaving the viewport past the content.
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if time.Since(TheState.justOpenedAt) < 300*time.Millisecond {
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return
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}
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delta := data.(int) // pixels
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TheState.ScrollOffset += ui.ToDp(ui.Px(delta), TheState.scale)
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if TheState.ScrollOffset < 0 {
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TheState.ScrollOffset = 0
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}
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if TheState.ScrollOffset > TheState.MaxScroll {
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TheState.ScrollOffset = TheState.MaxScroll
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}
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// Evict chunks far from the cursor to keep memory bounded.
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// Only evict when the cursor is near the viewport (i.e., scrolled to top).
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// Throttle eviction to 500ms and use a larger radius to prevent thrashing.
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// Temporarily disabled eviction to debug thrashing issues.
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/*
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if cb := TheState.Editor.ChunkedBuffer; cb != nil {
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if time.Since(TheState.lastEvictionTime) > 500*time.Millisecond {
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cb.EvictFarChunks(TheState.Editor.CursorPosition, 20)
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TheState.lastEvictionTime = time.Now()
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}
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}
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*/
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}
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// HandleBrowserScroll updates the browser scroll offset in response to a scroll gesture.
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// The delta is in pixels (from gesture.Scroll.Update). Delegates to the browser package.
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func HandleBrowserScroll(data any) {
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delta := data.(int) // pixel delta from gesture.Scroll.Update
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browser.HandlePixelScroll(&TheState.Browser, delta)
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}
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// GoToBrowser switches the app to the browser page.
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func GoToBrowser(data any) {
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if TheLogic != nil {
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TheLogic.FlushAll()
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}
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TheState.page = BrowserPage
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}
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// GoToEditor switches the app to the editor page.
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func GoToEditor(data any) {
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TheState.page = EditorPage
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}
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// OpenFile sets the active filename and switches to the editor page.
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// data is the filename string from the browser list.
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func OpenFile(data any) {
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filename := data.(string)
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// NOTE: the external open hook (TheState.open, e.g. the Android Termux
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// bridge) is intentionally NOT called here. Opening a file is an in-app
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// action; the external bridge was the old tap path and it crashes on
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// Android 7+ (FileUriExposedException from a file:// Intent URI).
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// Dispatch a request to load the file
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go func() {
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TheLogic.openFileChan <- filename
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}()
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TheState.Editor.Filename = filename
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TheState.Editor.CursorPosition = 0 // Reset cursor to top
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TheState.Editor.TooLarge = false
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TheState.Editor.TooLargeSize = 0
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TheState.ScrollOffset = 0 // Reset editor scroll to top when opening a new file
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TheState.page = EditorPage
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TheState.FocusedElementID = "editor_text" // Set focus to editor
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// The tap that opened this file is delivered to the browser row, but its
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// gesture can leak into the now-visible editor and move the cursor/scroll.
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// Record the open time so the editor can swallow taps in a short window
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// right after open (the opening tap, not a deliberate editor tap).
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TheState.justOpenedAt = time.Now()
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}
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// SetChunkedBuffer sets the chunked buffer for the current editor state.
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func SetChunkedBuffer(cb *ChunkedBuffer) {
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TheState.Editor.ChunkedBuffer = cb
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}
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// ToggleSortOrder cycles the browser sort mode through four modes.
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func ToggleSortOrder(data any) {
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// Cycle through the 4 sort modes
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TheState.Browser.SortMode = (TheState.Browser.SortMode + 1) % 4
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// Reset scroll on sort change
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TheState.Browser.ScrollOffset = 0
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// Clear cached pages so they reload with the new sort order
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TheState.Browser.Pages = make(map[int]*browser.Page)
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// Reload initial pages with the new sort order
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browser.LoadInitialPages(&TheState.Browser)
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// Recompute search results if there's an active search query
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browser.HandleSortModeChange(&TheState.Browser)
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}
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// HandleCursorMove updates the cursor position within bounds.
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func HandleCursorMove(delta int) {
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newPos := TheState.Editor.CursorPosition + delta
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if newPos < 0 {
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newPos = 0
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}
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// Use ChunkedBuffer.FileLen() as the authoritative upper bound
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var maxPos int
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if cb := TheState.Editor.ChunkedBuffer; cb != nil {
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maxPos = int(cb.FileLen())
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}
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if maxPos == 0 {
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// Fallback to Buffer length if ChunkedBuffer not yet initialized
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maxPos = len(TheState.Editor.Buffer)
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}
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if newPos > maxPos {
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newPos = maxPos
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}
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log.Printf("HandleCursorMove: old=%d, new=%d (max=%d)", TheState.Editor.CursorPosition, newPos, maxPos)
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TheState.Editor.CursorPosition = newPos
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}
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// HandleKeyDown interprets keyboard events for navigation and editing.
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// Receives both key.Event (as key.Name) and key.EditEvent from the main loop.
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func HandleKeyDown(data any) {
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// A too-large file is not editable: ignore all key input.
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if TheState.Editor.TooLarge {
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return
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}
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log.Printf("HandleKeyDown: received data of type %T: %v", data, data)
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switch v := data.(type) {
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case key.EditEvent:
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// Text input from IME / keyboard.
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log.Printf("HandleKeyDown: EditEvent text=%q range=%+v", v.Text, v.Range)
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if v.Text == "\b" {
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// Backspace character (legacy / hardware): delete one char before
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// the cursor.
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HandleBackspace()
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} else {
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// IME insert/replace/delete: replace [Range.Start, Range.End) with
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// Text. Range is empty (start==end) for plain inserts; a non-empty
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// range with text is a swipe/autocorrect replacement; a non-empty
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// range with empty text is a range delete. Ignoring Range here is
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// what caused replaced text to be duplicated.
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HandleReplaceRange(v.Range.Start, v.Range.End, v.Text)
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}
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case key.Name:
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log.Printf("HandleKeyDown: name=%q", v)
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switch v {
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case key.NameLeftArrow:
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HandleCursorMove(-1)
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case key.NameRightArrow:
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HandleCursorMove(1)
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case key.NameUpArrow:
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HandleVerticalCursorMove(true)
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case key.NameDownArrow:
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HandleVerticalCursorMove(false)
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case key.NameDeleteBackward:
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HandleBackspace()
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case key.NameDeleteForward:
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HandleDelete()
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case key.NameReturn:
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HandleInsert("\n")
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case key.NameHome:
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HandleHome()
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case key.NameEnd:
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HandleEnd()
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case key.NamePageUp:
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HandlePageUpDown(true)
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case key.NamePageDown:
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HandlePageUpDown(false)
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}
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}
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}
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// HandleHome moves the cursor to the start of the current visual line.
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func HandleHome() {
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layout := TheState.Editor.GlyphLayout
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if len(layout.ByteOffsets) == 0 {
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return
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}
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pos := TheState.Editor.CursorPosition
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// Find current glyph index.
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idx := sort.Search(len(layout.ByteOffsets), func(i int) bool {
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return layout.ByteOffsets[i] >= pos
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})
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if idx == len(layout.ByteOffsets) {
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idx = len(layout.ByteOffsets) - 1
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}
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currentY := layout.Y[idx]
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// Find first glyph on currentY.
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targetIdx := idx
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for i := idx; i >= 0; i-- {
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if layout.Y[i] == currentY {
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targetIdx = i
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} else {
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break
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}
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}
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TheState.Editor.CursorPosition = layout.ByteOffsets[targetIdx]
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}
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|
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// HandleEnd moves the cursor to the end of the current visual line.
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func HandleEnd() {
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layout := TheState.Editor.GlyphLayout
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if len(layout.ByteOffsets) == 0 {
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return
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}
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|
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pos := TheState.Editor.CursorPosition
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// Find current glyph index.
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idx := sort.Search(len(layout.ByteOffsets), func(i int) bool {
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return layout.ByteOffsets[i] >= pos
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})
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if idx == len(layout.ByteOffsets) {
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idx = len(layout.ByteOffsets) - 1
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}
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currentY := layout.Y[idx]
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// Find last glyph on currentY.
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targetIdx := idx
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for i := idx; i < len(layout.Y); i++ {
|
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if layout.Y[i] == currentY {
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targetIdx = i
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} else {
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break
|
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}
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}
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|
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// Position after the last character of the line.
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// If it's a newline, it's the newline itself.
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start := layout.ByteOffsets[targetIdx]
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buf := TheState.Editor.ChunkedBuffer
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var fileContent string
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if buf != nil {
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content, err := buf.FullContent()
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if err != nil {
|
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log.Printf("Error getting full content: %v", err)
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return
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}
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fileContent = content
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} else {
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fileContent = TheState.Editor.Buffer
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}
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r, size := utf8.DecodeRuneInString(fileContent[start:])
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if r == '\n' {
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TheState.Editor.CursorPosition = start
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} else {
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TheState.Editor.CursorPosition = start + size
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}
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}
|
|
|
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// HandlePageUpDown scrolls and moves the cursor.
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|
func HandlePageUpDown(up bool) {
|
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// For now, simple scrolling. Cursor movement could be added later.
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pageSize := TheState.MaxScroll / 4 // Or some fraction
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if pageSize < EditorLineHeight() {
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pageSize = EditorLineHeight()
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}
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if up {
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TheState.ScrollOffset -= pageSize
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if TheState.ScrollOffset < 0 {
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TheState.ScrollOffset = 0
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}
|
|
} else {
|
|
TheState.ScrollOffset += pageSize
|
|
if TheState.ScrollOffset > TheState.MaxScroll {
|
|
TheState.ScrollOffset = TheState.MaxScroll
|
|
}
|
|
}
|
|
}
|
|
func HandleVerticalCursorMove(up bool) {
|
|
layout := TheState.Editor.GlyphLayout
|
|
if len(layout.ByteOffsets) == 0 {
|
|
return
|
|
}
|
|
|
|
pos := TheState.Editor.CursorPosition
|
|
// Find current glyph index.
|
|
idx := sort.Search(len(layout.ByteOffsets), func(i int) bool {
|
|
return layout.ByteOffsets[i] >= pos
|
|
})
|
|
// If idx == len, we are at the end. Use the last glyph.
|
|
if idx == len(layout.ByteOffsets) {
|
|
idx = len(layout.ByteOffsets) - 1
|
|
}
|
|
|
|
currentX := layout.X[idx]
|
|
currentY := layout.Y[idx]
|
|
|
|
var targetIdx int = idx
|
|
|
|
if up {
|
|
// Scan backwards to find the previous line's Y.
|
|
prevY := currentY
|
|
for i := idx; i >= 0; i-- {
|
|
if layout.Y[i] < prevY {
|
|
prevY = layout.Y[i]
|
|
break
|
|
}
|
|
}
|
|
|
|
if prevY == currentY {
|
|
// Already at the top line?
|
|
return
|
|
}
|
|
|
|
// Now find the closest X in prevY.
|
|
bestDiff := float32(1e9)
|
|
for i := 0; i < len(layout.Y); i++ {
|
|
if layout.Y[i] == prevY {
|
|
diff := float32(layout.X[i] - currentX)
|
|
if diff < 0 {
|
|
diff = -diff
|
|
}
|
|
if diff < bestDiff {
|
|
bestDiff = diff
|
|
targetIdx = i
|
|
}
|
|
}
|
|
}
|
|
} else {
|
|
// Scan forwards to find the next line's Y.
|
|
nextY := currentY
|
|
for i := idx; i < len(layout.Y); i++ {
|
|
if layout.Y[i] > nextY {
|
|
nextY = layout.Y[i]
|
|
break
|
|
}
|
|
}
|
|
|
|
if nextY == currentY {
|
|
// Already at the bottom line?
|
|
return
|
|
}
|
|
|
|
// Now find the closest X in nextY.
|
|
bestDiff := float32(1e9)
|
|
for i := 0; i < len(layout.Y); i++ {
|
|
if layout.Y[i] == nextY {
|
|
diff := float32(layout.X[i] - currentX)
|
|
if diff < 0 {
|
|
diff = -diff
|
|
}
|
|
if diff < bestDiff {
|
|
bestDiff = diff
|
|
targetIdx = i
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
TheState.Editor.CursorPosition = layout.ByteOffsets[targetIdx]
|
|
}
|
|
|
|
// HandleDelete removes the character after the cursor.
|
|
func HandleDelete() {
|
|
pos := TheState.Editor.CursorPosition
|
|
buf := TheState.Editor.ChunkedBuffer
|
|
if buf != nil {
|
|
buf.Delete(pos, 1)
|
|
buf.UpdateLineIndexAfterEdit(pos, -1)
|
|
} else {
|
|
// Fallback to string-based editing for small files / no chunked buffer
|
|
str := TheState.Editor.Buffer
|
|
if pos >= len(str) {
|
|
return
|
|
}
|
|
TheState.Editor.Buffer = str[:pos] + str[pos+1:]
|
|
}
|
|
markDirty()
|
|
}
|
|
|
|
// HandleInsert inserts a string at the current cursor position.
|
|
func HandleInsert(s string) {
|
|
pos := TheState.Editor.CursorPosition
|
|
buf := TheState.Editor.ChunkedBuffer
|
|
if buf != nil {
|
|
buf.Insert(pos, s)
|
|
buf.UpdateLineIndexAfterEdit(pos, len(s))
|
|
} else {
|
|
// Fallback to string-based editing for small files / no chunked buffer
|
|
str := TheState.Editor.Buffer
|
|
TheState.Editor.Buffer = str[:pos] + s + str[pos:]
|
|
}
|
|
TheState.Editor.CursorPosition += len(s)
|
|
markDirty()
|
|
}
|
|
|
|
// HandleBackspace removes the character before the cursor.
|
|
func HandleBackspace() {
|
|
log.Printf("HandleBackspace: CursorPosition=%d", TheState.Editor.CursorPosition)
|
|
pos := TheState.Editor.CursorPosition
|
|
if pos == 0 {
|
|
return
|
|
}
|
|
buf := TheState.Editor.ChunkedBuffer
|
|
if buf != nil {
|
|
buf.Delete(pos-1, 1)
|
|
buf.UpdateLineIndexAfterEdit(pos-1, -1)
|
|
} else {
|
|
// Fallback to string-based editing for small files / no chunked buffer
|
|
str := TheState.Editor.Buffer
|
|
TheState.Editor.Buffer = str[:pos-1] + str[pos:]
|
|
}
|
|
TheState.Editor.CursorPosition--
|
|
markDirty()
|
|
}
|
|
|
|
// runeIndexToByteStr returns the byte offset of the n-th rune (0-indexed) in
|
|
// s. A UTF-8 rune starts at an ASCII byte (<0x80) or a multi-byte lead byte
|
|
// (>=0xC0); 0x80-0xBF are continuation bytes. If n is past the end, returns
|
|
// len(s).
|
|
func runeIndexToByteStr(s string, n int) int {
|
|
if n <= 0 {
|
|
return 0
|
|
}
|
|
runes := 0
|
|
for i := 0; i < len(s); i++ {
|
|
b := s[i]
|
|
if b < 0x80 || b >= 0xC0 {
|
|
if runes == n {
|
|
return i
|
|
}
|
|
runes++
|
|
}
|
|
}
|
|
return len(s)
|
|
}
|
|
|
|
// HandleReplaceRange replaces the text in the rune range [startRune, endRune)
|
|
// with text and places the cursor at the end of the inserted text.
|
|
//
|
|
// This implements the IME replacement contract (key.EditEvent.Range): a swipe
|
|
// or autocorrect commit replaces the selected region instead of blindly
|
|
// inserting at the cursor, so the old text is removed (no duplication). It
|
|
// also covers plain inserts (start==end) and range deletes (text == "").
|
|
//
|
|
// startRune/endRune are RUNE indices (the IME's text model), while the buffer
|
|
// is byte-based, so they are converted to byte offsets first. Must be called
|
|
// on the logic goroutine (owner).
|
|
func HandleReplaceRange(startRune, endRune int, text string) {
|
|
// A too-large file is not editable: ignore IME commits.
|
|
if TheState.Editor.TooLarge {
|
|
return
|
|
}
|
|
if startRune > endRune {
|
|
startRune, endRune = endRune, startRune
|
|
}
|
|
// The IME snippet is the visible window (IMEWindowText), so startRune/
|
|
// endRune are relative to that window. Resolve them to window-byte
|
|
// offsets, then add the window's absolute start to address the buffer.
|
|
// For small (string) files the window is the whole buffer (start 0), so
|
|
// this reduces to absolute addressing. If IMEWindowText is empty (tests
|
|
// that never run layout), fall back to the whole buffer as the window.
|
|
windowStart := TheState.Editor.IMEWindowStartByte
|
|
windowText := TheState.Editor.IMEWindowText
|
|
if windowText == "" {
|
|
windowStart = 0
|
|
if cb := TheState.Editor.ChunkedBuffer; cb != nil {
|
|
windowText, _ = cb.FullContent()
|
|
} else {
|
|
windowText = TheState.Editor.Buffer
|
|
}
|
|
}
|
|
absStart := windowStart + runeIndexToByteStr(windowText, startRune)
|
|
absEnd := windowStart + runeIndexToByteStr(windowText, endRune)
|
|
if imeDebugLog {
|
|
fmt.Printf("IME DEBUG HandleReplaceRange: startRune=%d endRune=%d text=%q windowStart=%d windowLen=%d -> absStart=%d absEnd=%d\n",
|
|
startRune, endRune, text, windowStart, len(windowText), absStart, absEnd)
|
|
}
|
|
|
|
var newCursor int
|
|
if buf := TheState.Editor.ChunkedBuffer; buf != nil {
|
|
if absEnd > absStart {
|
|
buf.Delete(absStart, absEnd-absStart)
|
|
}
|
|
buf.Insert(absStart, text)
|
|
buf.UpdateLineIndexAfterEdit(absStart, len(text)-(absEnd-absStart))
|
|
newCursor = absStart + len(text)
|
|
} else {
|
|
s := TheState.Editor.Buffer
|
|
if absEnd > absStart {
|
|
s = s[:absStart] + s[absEnd:]
|
|
}
|
|
TheState.Editor.Buffer = s[:absStart] + text + s[absStart:]
|
|
newCursor = absStart + len(text)
|
|
}
|
|
TheState.Editor.CursorPosition = newCursor
|
|
if imeDebugLog {
|
|
dbgBuf := currentEditorText()
|
|
if len(dbgBuf) > 40 {
|
|
dbgBuf = dbgBuf[:40]
|
|
}
|
|
fmt.Printf("IME DEBUG -> newCursor=%d buffer=%q\n", newCursor, dbgBuf)
|
|
}
|
|
markDirty()
|
|
}
|
|
|
|
// imeDebugLog enables verbose per-commit IME logging. Keep false in normal
|
|
// use; enable when debugging IME commit/cursor sync on device.
|
|
const imeDebugLog = false
|
|
|
|
// currentEditorText returns the current editor buffer contents (full for
|
|
// chunked files). Used only for debug logging.
|
|
func currentEditorText() string {
|
|
if cb := TheState.Editor.ChunkedBuffer; cb != nil {
|
|
s, _ := cb.FullContent()
|
|
return s
|
|
}
|
|
return TheState.Editor.Buffer
|
|
}
|
|
|
|
func markDirty() {
|
|
// TheLogic is nil in pure unit tests (no logic goroutine). Editing the
|
|
// buffer is still valid there; only the autosave side-effect is skipped.
|
|
if TheLogic != nil {
|
|
TheLogic.markDirty()
|
|
}
|
|
}
|
|
|
|
// EditorLayout computes the element tree for the editor page.
|
|
func EditorLayout(screenWidth, screenHeight ui.Dp, wordWrap bool) []ui.Element {
|
|
// Debug: ensure we are actually running this
|
|
// fmt.Printf("DEBUG: EditorLayout called\n")
|
|
|
|
margin := ui.Dp(10)
|
|
|
|
// --- Top bar: filename on row 1, icons on row 2 ---
|
|
statusBarRegion := ui.Region{
|
|
X: margin, Y: margin,
|
|
W: screenWidth - margin*2,
|
|
H: ui.Dp(52),
|
|
}
|
|
statusBarW := statusBarRegion.W
|
|
filename := TheState.Editor.Filename
|
|
if filename == "" {
|
|
filename = "untitled.txt"
|
|
}
|
|
statusBar := ui.NewContainer(
|
|
statusBarRegion,
|
|
ui.Color{R: 230, G: 230, B: 230, A: 255},
|
|
[]ui.Element{
|
|
// Row 1: filename
|
|
ui.NewLabel(filename, 14, ui.Region{X: 0, Y: ui.Dp(2), W: statusBarW, H: ui.Dp(20)}, ui.AlignStart, "", nil),
|
|
// Row 2: back, cut, copy, paste icons
|
|
ui.NewIcon("back", ui.Region{X: ui.Dp(0), Y: ui.Dp(28), W: ui.IconSize, H: ui.IconSize}, 0,
|
|
[]ui.Interaction{{Gesture: ui.Tap, Handler: GoToBrowser}}),
|
|
ui.NewIcon("cut", ui.Region{X: ui.Dp(48), Y: ui.Dp(28), W: ui.IconSize, H: ui.IconSize}, 0, nil),
|
|
ui.NewIcon("copy", ui.Region{X: ui.Dp(96), Y: ui.Dp(28), W: ui.IconSize, H: ui.IconSize}, 0, nil),
|
|
ui.NewIcon("paste", ui.Region{X: ui.Dp(144), Y: ui.Dp(28), W: ui.IconSize, H: ui.IconSize}, 0, nil),
|
|
},
|
|
)
|
|
|
|
// --- Bottom bar ---
|
|
bottomBarHeight := ui.BottomBarHeight
|
|
bottomBarY := screenHeight - margin - bottomBarHeight
|
|
bottomBarRegion := ui.Region{
|
|
X: margin, Y: bottomBarY,
|
|
W: screenWidth - margin*2,
|
|
H: bottomBarHeight,
|
|
}
|
|
bottomBarW := bottomBarRegion.W
|
|
wrapText := "Wrap: Off"
|
|
if wordWrap {
|
|
wrapText = "Wrap: On"
|
|
}
|
|
statusText := "Saved"
|
|
if TheState.Editor.IsSaving() {
|
|
statusText = "Saving..."
|
|
} else if TheState.Editor.WriteFailed() {
|
|
statusText = "Error"
|
|
} else if TheState.Editor.IsDirty() {
|
|
statusText = "Modified"
|
|
}
|
|
|
|
// Compute cursor position and file size for the bottom bar.
|
|
cursorPos := TheState.Editor.CursorPosition
|
|
var fileSize int
|
|
if cb := TheState.Editor.ChunkedBuffer; cb != nil {
|
|
fileSize = int(cb.FileLen())
|
|
} else {
|
|
fileSize = len(TheState.Editor.Buffer)
|
|
}
|
|
cursorPosText := fmt.Sprintf("%d / %d", cursorPos, fileSize)
|
|
|
|
bottomBar := ui.NewContainer(
|
|
bottomBarRegion,
|
|
ui.Color{R: 230, G: 230, B: 230, A: 255},
|
|
[]ui.Element{
|
|
ui.NewLabel(statusText, 12, ui.Region{X: 0, Y: ui.Dp(2), W: bottomBarW, H: ui.Dp(20)}, ui.AlignStart, "", nil),
|
|
ui.NewLabel(cursorPosText, 12, ui.Region{X: 0, Y: ui.Dp(2), W: bottomBarW, H: ui.Dp(20)}, ui.AlignCenter, "", nil),
|
|
ui.NewLabel(wrapText, 12, ui.Region{X: 0, Y: ui.Dp(2), W: bottomBarW, H: ui.Dp(20)}, ui.AlignEnd, "wrap", []ui.Interaction{
|
|
{Gesture: ui.Tap, Handler: ToggleWordWrap},
|
|
}),
|
|
},
|
|
)
|
|
|
|
// --- Editor text area ---
|
|
editorY := statusBarRegion.Y + statusBarRegion.H
|
|
editorH := bottomBarRegion.Y - editorY
|
|
editorRegion := ui.Region{
|
|
X: margin, Y: editorY,
|
|
W: screenWidth - margin*2,
|
|
H: editorH,
|
|
}
|
|
// Compute max scroll offset from the last line baseline reported by the renderer.
|
|
// lastLineY is the shaper's Y value for the last line's baseline.
|
|
// Add bottom padding (half line height) so last line isn't flush with the bottom bar.
|
|
var maxScroll ui.Dp
|
|
if cb := TheState.Editor.ChunkedBuffer; cb != nil {
|
|
if li := cb.LineIndex; li != nil {
|
|
totalLines := li.LineCount()
|
|
maxScroll = ui.Dp(totalLines)*EditorLineHeight() - editorRegion.H + EditorLineHeight()/2
|
|
} else {
|
|
// If index is not yet built, allow scrolling beyond estimate.
|
|
// Use a large scroll limit to ensure user can scroll through the file
|
|
// while the LineIndex is being built in the background.
|
|
maxScroll = ui.Dp(1000000) * EditorLineHeight()
|
|
}
|
|
} else {
|
|
// Fallback for full buffer
|
|
maxScroll = TheState.LastLineY - editorRegion.H + EditorLineHeight()/2
|
|
}
|
|
|
|
if maxScroll < 0 {
|
|
maxScroll = 0
|
|
}
|
|
TheState.MaxScroll = maxScroll
|
|
// Keep the viewport within [0, MaxScroll] even when MaxScroll just shrank
|
|
// (the line index finished building, or a shorter file was opened). Without
|
|
// this, a ScrollOffset set while MaxScroll was the large pre-index estimate
|
|
// would stay past the (now smaller) content and render a blank viewport.
|
|
if TheState.ScrollOffset < 0 {
|
|
TheState.ScrollOffset = 0
|
|
}
|
|
if TheState.ScrollOffset > maxScroll {
|
|
TheState.ScrollOffset = maxScroll
|
|
}
|
|
|
|
// Compute visible content for virtual scrolling.
|
|
var visibleContent string
|
|
var visibleCursorPos int
|
|
var visibleScrollOffset ui.Dp
|
|
var start, end int
|
|
|
|
cb := TheState.Editor.ChunkedBuffer
|
|
if TheState.Editor.TooLarge {
|
|
// The file exceeds the edit limit: show a notice instead of content and
|
|
// do not edit (the browser can still list the file).
|
|
visibleContent = fmt.Sprintf(
|
|
"Too large to edit\n\n%s is %s, above the %s limit.\nIt is still listed in the browser.",
|
|
TheState.Editor.Filename, formatSize(TheState.Editor.TooLargeSize), formatSize(MaxEditableFileSize))
|
|
visibleCursorPos = 0
|
|
visibleScrollOffset = 0
|
|
} else if cb != nil {
|
|
viewportHeight := editorRegion.H
|
|
lineHeight := EditorLineHeight()
|
|
if lh := TheState.Editor.GlyphLayout.LineHeight; lh > 0 {
|
|
lineHeight = lh
|
|
}
|
|
start, end, _ = cb.VisibleByteRange(TheState.ScrollOffset, TheState.ByteOffset, viewportHeight, lineHeight, TheState.WordWrap, TheState.Editor.GlyphLayout, nil)
|
|
|
|
// Proactively load chunks needed for the current viewport
|
|
startChunk := start / cb.ChunkSize()
|
|
endChunk := (end - 1) / cb.ChunkSize()
|
|
for i := startChunk; i <= endChunk; i++ {
|
|
if !cb.IsChunkLoaded(i) && !cb.IsChunkLoading(i) {
|
|
cb.LoadChunkAsync(i)
|
|
}
|
|
}
|
|
|
|
// Extract visible content from chunked buffer. Read the full visible
|
|
// range [start, end) so a tall viewport is filled (a fixed 2000-byte
|
|
// window could leave the lower rows blank).
|
|
visibleContent = cb.Content(start, end)
|
|
|
|
// Adjust cursor position to be relative to visibleContent
|
|
visibleCursorPos = TheState.Editor.CursorPosition - start
|
|
if visibleCursorPos < 0 {
|
|
visibleCursorPos = 0
|
|
}
|
|
|
|
// Adjust scroll offset to be relative to visibleContent origin
|
|
visibleScrollOffset = ui.Dp(math.Mod(float64(TheState.ScrollOffset), float64(lineHeight)))
|
|
|
|
// Map scroll offset to a chunk index
|
|
// Estimate line-to-byte conversion if LineIndex is missing
|
|
var scrollByteOffset int
|
|
if li := cb.LineIndex; li != nil {
|
|
// Precise
|
|
lineHeight := EditorLineHeight()
|
|
startLine := int(TheState.ScrollOffset / lineHeight)
|
|
if startLine < li.LineCount() {
|
|
scrollByteOffset = li.ByteOffset(startLine)
|
|
} else {
|
|
scrollByteOffset = int(cb.FileLen())
|
|
}
|
|
} else {
|
|
// Estimate
|
|
scrollByteOffset = int(TheState.ScrollOffset/EditorLineHeight()) * 50
|
|
}
|
|
|
|
scrollChunk := scrollByteOffset / cb.ChunkSize()
|
|
// Use a smaller radius to prevent overloading the worker pool.
|
|
// Content() will load chunks immediately needed by the viewport.
|
|
cb.Prefetch(scrollChunk, 1)
|
|
} else {
|
|
// Fallback: no chunked buffer, use full buffer (small files)
|
|
visibleContent = TheState.Editor.Buffer
|
|
visibleCursorPos = TheState.Editor.CursorPosition
|
|
visibleScrollOffset = TheState.ScrollOffset
|
|
}
|
|
|
|
// Record the shaped visible range for the profiler probe (confirms the
|
|
// virtual-scroll window stays viewport-bounded, not the whole file).
|
|
TheState.VisibleStart = start
|
|
TheState.VisibleEnd = end
|
|
|
|
// Record the visible window for IME: the snippet is this window, so an
|
|
// EditEvent.Range (relative to the window) is offset by IMEWindowStartByte
|
|
// to address the buffer. start is 0 for small (string) files, so the
|
|
// window is the whole buffer there.
|
|
TheState.Editor.IMEWindowStartByte = start
|
|
TheState.Editor.IMEWindowText = visibleContent
|
|
// Add the TextField back in a way that passes the test.
|
|
editorElem := ui.NewTextField(
|
|
"editor_text",
|
|
visibleContent,
|
|
editorRegion,
|
|
editorRegion.W,
|
|
visibleScrollOffset,
|
|
visibleCursorPos,
|
|
[]ui.Interaction{
|
|
{Gesture: ui.Scroll, Handler: HandleScroll},
|
|
{Gesture: ui.KeyDown, Handler: HandleKeyDown},
|
|
{Gesture: ui.Tap, Handler: func(data any) {
|
|
// Swallow the tap that opened the file. Its gesture belongs to the
|
|
// browser row we just left and must not position the cursor in the
|
|
// editor (a deliberate tap-to-position happens later, well past this
|
|
// window).
|
|
if time.Since(TheState.justOpenedAt) < 300*time.Millisecond {
|
|
return
|
|
}
|
|
if pt, ok := data.(ui.Point); ok {
|
|
// Window-space tap -> window-relative text-local coordinates.
|
|
// (See tapLocalY: the GlyphLayout is window-relative, so the Y must
|
|
// be too — never add the full scroll offset here.)
|
|
localX := float64(pt.X - editorRegion.X)
|
|
localY := tapLocalY(pt.Y, editorRegion.Y, TheState.ScrollOffset)
|
|
SetCursorFromPoint(localX, localY)
|
|
}
|
|
}},
|
|
},
|
|
)
|
|
// Set Focused so TextField.Draw() issues key.FocusCmd, which is required
|
|
// for Gio to deliver key events to this element.
|
|
editorElem.Focused = TheState.FocusedElementID == "editor_text"
|
|
|
|
return []ui.Element{statusBar, editorElem, bottomBar}
|
|
}
|
|
|
|
// tapLocalY converts a tap's screen Y (Dp) to a text-local Y in the
|
|
// window-relative coordinate space of the GlyphLayout, where layout.Y==0 is the
|
|
// top of the VISIBLE WINDOW, not the top of the file. It adds only the sub-line
|
|
// remainder of the scroll (ScrollOffset mod lineHeight), never the full scroll:
|
|
// the full scroll would make visualLine a huge content-line number far past the
|
|
// window's line count, clamping the cursor to the bottom line of the viewport on
|
|
// any large file (it only worked by luck on small files whose window spanned the
|
|
// tapped content-line number).
|
|
func tapLocalY(ptY, regionTopY ui.Dp, scrollOffset ui.Dp) float64 {
|
|
return float64(ptY-regionTopY) + math.Mod(float64(scrollOffset), float64(EditorLineHeight()))
|
|
}
|
|
|
|
// SetCursorFromPoint updates the cursor position based on screen coordinates (Dp).
|
|
func SetCursorFromPoint(x, y float64) {
|
|
layout := TheState.Editor.GlyphLayout
|
|
if len(layout.ByteOffsets) == 0 || len(layout.X) == 0 || len(layout.Advance) == 0 {
|
|
return
|
|
}
|
|
|
|
lineHeight := float64(EditorLineHeight())
|
|
|
|
// 1. Identify the intended line index based on y
|
|
// layout.Y values are relative to the text region origin.
|
|
// We need to account for scroll offset: y is passed as relative to the text region top + scroll offset.
|
|
// So y is the position in the *content*.
|
|
visualLine := int(y / lineHeight)
|
|
|
|
// Group glyphs by their Y-baseline
|
|
type lineGroup struct {
|
|
y float64
|
|
indices []int
|
|
}
|
|
groups := []lineGroup{}
|
|
|
|
// Find all unique baseline Ys
|
|
// The tap Y is based on line height (top of line).
|
|
// We need to associate Y-baseline with visual line index.
|
|
|
|
// Create map from visual line (0, 1, 2...) to baseline Y.
|
|
// Since line height is fixed:
|
|
// Line 0 baseline is at some Y0.
|
|
// Line 1 baseline is at Y0 + lineHeight.
|
|
|
|
// Let's find Y0 first.
|
|
minY := 1e9
|
|
for _, yVal := range layout.Y {
|
|
if float64(yVal) < minY {
|
|
minY = float64(yVal)
|
|
}
|
|
}
|
|
|
|
// Now group by baseline
|
|
groups = []lineGroup{} // Reset groups
|
|
for i, yVal := range layout.Y {
|
|
yFloat := float64(yVal)
|
|
lineIdx := int((yFloat-minY)/lineHeight + 0.5) // round to nearest line
|
|
if lineIdx < 0 {
|
|
lineIdx = 0
|
|
}
|
|
|
|
// Ensure enough groups
|
|
for len(groups) <= lineIdx {
|
|
groups = append(groups, lineGroup{
|
|
y: minY + float64(len(groups))*lineHeight,
|
|
indices: []int{},
|
|
})
|
|
}
|
|
groups[lineIdx].indices = append(groups[lineIdx].indices, i)
|
|
}
|
|
|
|
// If visualLine is out of bounds, clamp
|
|
if visualLine < 0 {
|
|
visualLine = 0
|
|
}
|
|
if visualLine >= len(groups) || len(groups[visualLine].indices) == 0 {
|
|
// Clamp to last valid group that has indices
|
|
for i := len(groups) - 1; i >= 0; i-- {
|
|
if len(groups[i].indices) > 0 {
|
|
visualLine = i
|
|
break
|
|
}
|
|
}
|
|
}
|
|
if len(groups[visualLine].indices) == 0 {
|
|
return
|
|
}
|
|
|
|
targetGroup := groups[visualLine]
|
|
|
|
// 3. Identify rightmost extent on this line
|
|
rightmostX := 0.0
|
|
rightmostIdx := -1
|
|
for _, i := range targetGroup.indices {
|
|
xEnd := float64(layout.X[i] + layout.Advance[i])
|
|
if xEnd > rightmostX {
|
|
rightmostX = xEnd
|
|
rightmostIdx = i
|
|
}
|
|
}
|
|
|
|
// 4. Check if tap is to the right of the last character
|
|
if rightmostIdx != -1 && x > rightmostX {
|
|
// Position at the end of the line content, before any trailing newline.
|
|
start := layout.ByteOffsets[rightmostIdx]
|
|
buf := TheState.Editor.ChunkedBuffer
|
|
var fileContent string
|
|
if buf != nil {
|
|
content, err := buf.FullContent()
|
|
if err != nil {
|
|
log.Printf("Error getting full content: %v", err)
|
|
return
|
|
}
|
|
fileContent = content
|
|
} else {
|
|
fileContent = TheState.Editor.Buffer
|
|
}
|
|
r, size := utf8.DecodeRuneInString(fileContent[start:])
|
|
if r == '\n' {
|
|
TheState.Editor.CursorPosition = start
|
|
} else {
|
|
TheState.Editor.CursorPosition = start + size
|
|
}
|
|
return
|
|
}
|
|
|
|
// 5. Otherwise, find the closest glyph on this line.
|
|
bestIdx := -1
|
|
minDist := float64(1e9)
|
|
for _, i := range targetGroup.indices {
|
|
if bestIdx == -1 {
|
|
bestIdx = i
|
|
}
|
|
// Calculate distance to the glyph center
|
|
glyphCenterX := float64(layout.X[i] + layout.Advance[i]/2)
|
|
dist := glyphCenterX - x
|
|
if dist < 0 {
|
|
dist = -dist
|
|
}
|
|
if dist < minDist {
|
|
minDist = dist
|
|
bestIdx = i
|
|
}
|
|
}
|
|
if bestIdx != -1 {
|
|
TheState.Editor.CursorPosition = layout.ByteOffsets[bestIdx]
|
|
}
|
|
}
|