Greg Pomerantz
7239b1e7ae
The line-lock from the previous fix made anchors immovable across lines — dragging a handle vertically no longer extended the selection, losing the native multi-line behaviour. New contract: a handle anchor moves RELATIVE to its own visual line. The finger's vertical displacement from the grab position, in whole visual line heights, selects the target line (under half a line: the anchor's own line); the finger's x is projected onto that line. A stationary or horizontal drag never moves the anchor off its line (the grab-box press stays safe — the original bug is gone), while a deliberate vertical drag walks the anchor across lines. The mapping is relative, not the finger's absolute line, because the 48dp grab box is centred below the line: a low press tracking the finger's absolute line would first drag the anchor the wrong way, through a collapse, before reaching the anchor's line. Verified on device: end handle dragged down extends the selection across the newline; start handle dragged up extends it onto the previous line; horizontal drags still shrink along the line without clearing. Tests mutation-verified against both the pre-fix mapping and the absolute-finger-line variant. Docs section 17 updated.
489 lines
17 KiB
Go
489 lines
17 KiB
Go
package editor
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import (
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"testing"
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"pad/internal/ui"
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)
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// touchSelState sets up a fresh string-buffer state with a single-line
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// GlyphLayout: 11 glyphs at x=10*i (advance 10), line top at y=0.
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// EditorRegion is {X:16, Y:100, W:379, H:700} so text-local x = pt.X-16 and
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// tapLocalY(y,100,0) = pt.Y-100 (scroll offset 0).
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func touchSelState(content string) {
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TheState = NewState()
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TheState.Editor.Buffer = content
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TheState.Editor.CursorPosition = len(content)
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TheState.EditorRegion = ui.Region{X: 16, Y: 100, W: 379, H: 700}
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TheState.ScrollOffset = 0
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// The visible window (what layoutFrame sets every frame): the whole
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// string buffer. bytePosToScreenXY bounds-checks against it.
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TheState.Editor.IMEWindowStartByte = 0
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TheState.Editor.IMEWindowText = content
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n := len(content)
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bo := make([]int, n)
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xs := make([]ui.Dp, n)
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ys := make([]ui.Dp, n)
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ad := make([]ui.Dp, n)
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for i := 0; i < n; i++ {
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bo[i] = i
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xs[i] = ui.Dp(10 * i)
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ys[i] = 0
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ad[i] = 10
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}
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TheState.Editor.GlyphLayout = ui.GlyphLayout{
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ByteOffsets: bo,
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X: xs,
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Y: ys,
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Advance: ad,
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}
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}
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// assertMenu checks menu visibility and item icons.
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func assertMenu(t *testing.T, wantVisible bool, wantIcons ...string) {
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t.Helper()
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e := TheState.Editor
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if e.MenuVisible != wantVisible {
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t.Fatalf("MenuVisible = %v, want %v", e.MenuVisible, wantVisible)
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}
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if wantVisible {
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if len(e.MenuItems) != len(wantIcons) {
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t.Fatalf("menu has %d items, want %d", len(e.MenuItems), len(wantIcons))
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}
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for i, it := range e.MenuItems {
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if it.Icon != wantIcons[i] {
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t.Errorf("menu item %d icon = %q, want %q", i, it.Icon, wantIcons[i])
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}
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}
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}
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}
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func TestWordRangeAt(t *testing.T) {
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touchSelState("hello world")
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// Inside a word.
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s, e, ok := wordRangeAt(3)
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if !ok || s != 0 || e != 5 {
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t.Errorf("wordRangeAt(3) = [%d,%d) ok=%v, want [0,5) true", s, e, ok)
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}
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// Second word.
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s, e, ok = wordRangeAt(7)
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if !ok || s != 6 || e != 11 {
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t.Errorf("wordRangeAt(7) = [%d,%d) ok=%v, want [6,11) true", s, e, ok)
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}
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// Word boundary: position right after a word (space after) still finds
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// the word ending there.
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s, e, ok = wordRangeAt(5)
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if !ok || s != 0 || e != 5 {
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t.Errorf("wordRangeAt(5) = [%d,%d) ok=%v, want [0,5) true", s, e, ok)
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}
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// EOF: the position is right after the last word -> that word.
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s, e, ok = wordRangeAt(11)
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if !ok || s != 6 || e != 11 {
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t.Errorf("wordRangeAt(11) = [%d,%d) ok=%v, want [6,11) true", s, e, ok)
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}
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}
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func TestWordRangeAt_PunctuationAndIdentifiers(t *testing.T) {
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touchSelState("foo,bar_baz 123")
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// "bar_baz" is one word (underscore joins).
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s, e, ok := wordRangeAt(7)
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if !ok || s != 4 || e != 11 {
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t.Errorf("wordRangeAt(7) = [%d,%d) ok=%v, want [4,11) true", s, e, ok)
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}
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// "123".
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s, e, ok = wordRangeAt(14)
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if !ok || s != 12 || e != 15 {
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t.Errorf("wordRangeAt(14) = [%d,%d) ok=%v, want [12,15) true", s, e, ok)
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}
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// Position at the comma, right after "foo": the word ending there.
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s, e, ok = wordRangeAt(3)
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if !ok || s != 0 || e != 3 {
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t.Errorf("wordRangeAt(3) = [%d,%d) ok=%v, want [0,3) true", s, e, ok)
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}
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}
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func TestHandleLongPressAt_SelectsWord(t *testing.T) {
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touchSelState("hello world")
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// Long press on the first glyph of "hello" (window pt: x=16+2=18, y=108).
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HandleLongPressAt(18, 108)
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assertSelection(t, 0, 5)
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assertMenu(t, true, "copy", "cut", "paste")
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if TheState.Editor.SelectionAnchor != 0 {
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t.Errorf("anchor = %d, want 0", TheState.Editor.SelectionAnchor)
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}
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if TheState.Editor.CursorPosition != 5 {
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t.Errorf("cursor = %d, want 5", TheState.Editor.CursorPosition)
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}
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}
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func TestHandleLongPressAt_BlankGivesCaretDrag(t *testing.T) {
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// Line ends with punctuation so the position right after the last glyph
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// is NOT adjacent to a word rune (a blank spot, not a word edge).
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touchSelState("hello world.")
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// Long press far right of the last glyph (x=16+150=166, past x=120).
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HandleLongPressAt(166, 108)
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assertSelection(t, -1, -1)
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if !TheState.Editor.CaretDrag {
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t.Errorf("CaretDrag = false, want true (long press on blank)")
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}
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// No selection -> the menu offers only Paste.
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assertMenu(t, true, "paste")
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if TheState.Editor.CursorPosition != 12 {
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t.Errorf("cursor = %d, want 12 (end of line)", TheState.Editor.CursorPosition)
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}
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}
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func TestHandleLongPressAt_AfterLastWordSelectsIt(t *testing.T) {
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// A long press in the blank just past the last word selects that word
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// (the word adjacent to the tap), matching Android's word selection.
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touchSelState("hello world")
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HandleLongPressAt(166, 108)
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assertSelection(t, 6, 11)
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}
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func TestHandleLongPressAt_InGapBetweenWords(t *testing.T) {
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touchSelState("hello world") // two spaces
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// Long press on the SECOND space (glyph 6, center x=65; pt 16+65=81):
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// no word rune at or immediately before the position -> caret.
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HandleLongPressAt(81, 108)
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assertSelection(t, -1, -1)
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if !TheState.Editor.CaretDrag {
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t.Errorf("CaretDrag = false, want true (long press in word gap)")
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}
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if TheState.Editor.CursorPosition != 6 {
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t.Errorf("cursor = %d, want 6", TheState.Editor.CursorPosition)
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}
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}
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func TestHandleDoubleTapAt_SelectsWord(t *testing.T) {
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touchSelState("hello world")
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HandleDoubleTapAt(18, 108)
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assertSelection(t, 0, 5)
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assertMenu(t, true, "copy", "cut", "paste")
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}
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func TestHandleTapAt_MovesCaretAndClearsSelection(t *testing.T) {
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touchSelState("hello world")
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// Establish a selection, then a plain tap clears it and moves the caret.
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HandleLongPressAt(18, 108)
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assertSelection(t, 0, 5)
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// Tap on the 'w' of "world" (glyph 6, x=60..70; local 62 -> pt 78).
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HandleTapAt(78, 108)
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assertSelection(t, -1, -1)
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if TheState.Editor.CaretDrag {
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t.Errorf("CaretDrag = true after plain tap, want false")
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}
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if TheState.Editor.CursorPosition != 6 {
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t.Errorf("cursor = %d, want 6", TheState.Editor.CursorPosition)
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}
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}
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func TestHandleTapAt_InsideMenuIsIgnored(t *testing.T) {
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touchSelState("hello world")
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HandleLongPressAt(18, 108)
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if !TheState.Editor.MenuVisible {
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t.Fatal("expected menu visible")
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}
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posBefore := TheState.Editor.CursorPosition
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selStartBefore := TheState.Editor.SelectionStart
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// Tap inside the menu (top-left item).
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m := TheState.Editor.MenuRect
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HandleTapAt(m.X+5, m.Y+5)
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if TheState.Editor.CursorPosition != posBefore {
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t.Errorf("cursor moved to %d after tap in menu, want %d (ignored)", TheState.Editor.CursorPosition, posBefore)
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}
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if TheState.Editor.SelectionStart != selStartBefore {
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t.Errorf("selection changed after tap in menu")
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}
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if !TheState.Editor.MenuVisible {
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t.Errorf("menu hidden after tap in menu, want still visible")
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}
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}
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func TestSelDrag_EndHandleExtends(t *testing.T) {
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touchSelState("hello world")
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HandleLongPressAt(18, 108) // selects "hello" [0,5)
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// Drag the end handle (which=1) past the last glyph (local 115 > 110)
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// so the whole line is selected.
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HandleSelDragEvt(ui.SelectionDragEvent{Which: 1, X: 16 + 115, Y: 108})
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HandleSelDragEvt(ui.SelectionDragEvent{Which: 1, X: 16 + 115, Y: 108})
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assertSelection(t, 0, 11)
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}
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func TestSelDrag_StartHandleExtends(t *testing.T) {
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touchSelState("hello world")
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HandleLongPressAt(18, 108) // selects "hello" [0,5)
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// Drag the start handle (which=0) to the 'o' (glyph 4, x=40..50; local 45 -> pt 61).
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HandleSelDragEvt(ui.SelectionDragEvent{Which: 0, X: 16 + 45, Y: 108})
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HandleSelDragEvt(ui.SelectionDragEvent{Which: 0, X: 16 + 45, Y: 108})
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assertSelection(t, 4, 5)
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}
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func TestSelDrag_StartHandleCollapseClears(t *testing.T) {
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touchSelState("hello world")
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HandleLongPressAt(18, 108) // selects "hello" [0,5)
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// Drag the start handle to the end of the selection -> zero-length -> cleared.
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HandleSelDragEvt(ui.SelectionDragEvent{Which: 0, X: 16 + 52, Y: 108})
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HandleSelDragEvt(ui.SelectionDragEvent{Which: 0, X: 16 + 52, Y: 108})
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assertSelection(t, -1, -1)
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assertMenu(t, false)
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}
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func TestSelDrag_BodyMovesPreservingLength(t *testing.T) {
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touchSelState("hello world")
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HandleLongPressAt(18, 108) // selects "hello" [0,5)
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// Grab the body above the 'l' (glyph 2, x=20..30; local 25 -> pt 41):
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// SelDragRel = pos(2) - selStart(0) = 2.
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HandleSelDragEvt(ui.SelectionDragEvent{Which: 2, X: 16 + 25, Y: 108})
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// Move the body so the finger is above the 'r' of world (glyph 9, x=90..100; local 95 -> pt 111):
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// pos = 9 -> new start = 9-2 = 7 -> [7,12) clamped to [7,11)...
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HandleSelDragEvt(ui.SelectionDragEvent{Which: 2, X: 16 + 95, Y: 108})
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s := TheState.Editor
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if s.SelectionStart != 6 || s.SelectionEnd != 11 {
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// length 5 preserved, clamped at EOF: [6,11)
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t.Errorf("body drag selection = [%d,%d), want [6,11)", s.SelectionStart, s.SelectionEnd)
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}
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HandleSelDragEvt(ui.SelectionDragEnd{})
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}
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func TestSelDrag_CaretHandleMovesCursor(t *testing.T) {
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touchSelState("hello world.") // punctuation keeps the right side blank
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HandleLongPressAt(166, 108) // blank -> caret drag at 12
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if !TheState.Editor.CaretDrag {
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t.Fatal("expected caret drag mode")
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}
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// Drag the caret handle (which=3) to glyph 2 (local 25 -> pt 41).
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HandleSelDragEvt(ui.SelectionDragEvent{Which: 3, X: 16 + 25, Y: 108})
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HandleSelDragEvt(ui.SelectionDragEvent{Which: 3, X: 16 + 25, Y: 108})
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if TheState.Editor.CursorPosition != 2 {
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t.Errorf("cursor = %d after caret drag, want 2", TheState.Editor.CursorPosition)
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}
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// The handle stays up while dragging...
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if !TheState.Editor.CaretDrag {
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t.Errorf("CaretDrag cleared mid-drag, want true")
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}
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HandleSelDragEvt(ui.SelectionDragEnd{})
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if TheState.Editor.CaretDrag {
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t.Errorf("CaretDrag not cleared on drag end")
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}
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}
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func TestMenuCopy(t *testing.T) {
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touchSelState("hello world")
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HandleLongPressAt(18, 108) // selects "hello"
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m := TheState.Editor.MenuRect
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// Tap the copy item (first item, X offset 0).
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HandleMenuTap(m.X+10, m.Y+10)
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select {
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case text := <-TheState.clipboardSetChan:
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if text != "hello" {
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t.Errorf("clipboard = %q, want %q", text, "hello")
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}
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default:
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t.Fatal("no clipboard write after copy")
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}
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// Copy does not clear the selection (the highlight stays), but the
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// menu closes, as on Android.
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assertSelection(t, 0, 5)
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assertMenu(t, false)
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}
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func TestMenuCut(t *testing.T) {
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touchSelState("hello world")
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HandleLongPressAt(18, 108) // selects "hello"
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m := TheState.Editor.MenuRect
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// Tap the cut item (second item).
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HandleMenuTap(m.X+ui.Dp(menuItemW)+10, m.Y+10)
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select {
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case text := <-TheState.clipboardSetChan:
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if text != "hello" {
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t.Errorf("clipboard = %q, want %q", text, "hello")
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}
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default:
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t.Fatal("no clipboard write after cut")
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}
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if got := TheState.Editor.Buffer; got != " world" {
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t.Errorf("buffer = %q after cut, want %q", got, " world")
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}
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assertSelection(t, -1, -1)
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assertMenu(t, false)
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if TheState.Editor.CursorPosition != 0 {
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t.Errorf("cursor = %d after cut, want 0", TheState.Editor.CursorPosition)
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}
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}
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func TestMenuPaste(t *testing.T) {
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touchSelState("hello")
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HandleLongPressAt(18, 108) // selects "hello"
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// Paste replaces the live selection (via the same path the Run loop uses
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// when the main goroutine forwards clipboard content).
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HandlePaste("XY")
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if got := TheState.Editor.Buffer; got != "XY" {
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t.Errorf("buffer = %q after paste, want %q", got, "XY")
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}
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assertSelection(t, -1, -1)
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assertMenu(t, false)
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if TheState.Editor.CursorPosition != 2 {
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t.Errorf("cursor = %d after paste, want 2", TheState.Editor.CursorPosition)
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}
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}
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func TestMenuPaste_NoSelectionInsertsAtCursor(t *testing.T) {
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touchSelState("hello")
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TheState.Editor.CursorPosition = 5
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HandlePaste(",")
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if got := TheState.Editor.Buffer; got != "hello," {
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t.Errorf("buffer = %q after paste, want %q", got, "hello,")
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}
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if TheState.Editor.CursorPosition != 6 {
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t.Errorf("cursor = %d after paste, want 6", TheState.Editor.CursorPosition)
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}
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}
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func TestMenuTapPaste_HidesMenuAndRequestsRead(t *testing.T) {
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touchSelState("hello world")
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HandleLongPressAt(18, 108) // selects "hello"
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m := TheState.Editor.MenuRect
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// Tap the paste item (third item).
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HandleMenuTap(m.X+2*ui.Dp(menuItemW)+10, m.Y+10)
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select {
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case <-TheState.pasteReqChan:
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default:
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t.Fatal("no paste request after menu paste tap")
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}
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// The menu closes immediately (the read is asynchronous); the
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// selection stays until the pasted content arrives.
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assertMenu(t, false)
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assertSelection(t, 0, 5)
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}
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func TestSelectionEdit_CutThenTypeReplaces(t *testing.T) {
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touchSelState("hello world")
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HandleLongPressAt(18, 108) // selects "hello"
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HandleInsert("goodbye")
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if got := TheState.Editor.Buffer; got != "goodbye world" {
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t.Errorf("buffer = %q, want %q", got, "goodbye world")
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}
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}
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// touchSelState2Lines sets up the same geometry as touchSelState but with a
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// second line beneath the first: "hello world\nsecond line\n". Line 0 glyphs
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// (bytes 0..10) sit at Y=0; line 1 glyphs (bytes 12..22) at Y=lineHeight.
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// The 48dp handle grab box of a line-0 handle straddles into line 1's row,
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// which is what the line-projection regression tests rely on.
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func touchSelState2Lines() {
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content := "hello world\nsecond line\n"
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TheState = NewState()
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TheState.Editor.Buffer = content
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TheState.Editor.CursorPosition = len(content)
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TheState.EditorRegion = ui.Region{X: 16, Y: 100, W: 379, H: 700}
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TheState.ScrollOffset = 0
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TheState.Editor.IMEWindowStartByte = 0
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TheState.Editor.IMEWindowText = content
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lh := ui.Dp(16.8) // EditorLineHeight at the default font scale
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bo := []int{}
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xs := []ui.Dp{}
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s := []ui.Dp{}
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ad := []ui.Dp{}
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for i := 0; i < 11; i++ { // line 0: bytes 0..10
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bo = append(bo, i)
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xs = append(xs, ui.Dp(10*i))
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s = append(s, 0)
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ad = append(ad, 10)
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}
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for j := 0; j < 11; j++ { // line 1: bytes 12..22
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bo = append(bo, 12+j)
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xs = append(xs, ui.Dp(10*j))
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s = append(s, lh)
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ad = append(ad, 10)
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}
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TheState.Editor.GlyphLayout = ui.GlyphLayout{
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LineHeight: lh,
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ByteOffsets: bo,
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X: xs,
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Y: s,
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Advance: ad,
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}
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}
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// TestSelDrag_StartHandle_PressOnLineBelow_KeepsSelection is a regression
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// test: the start handle's 48dp grab box is centred BELOW the line (the
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// teardrop hangs off the line's bottom edge), so a press in the lower half
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// of the box lands on the neighbouring line. The press (zero displacement
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// from the grab) must not move the anchor off its own line; mapping it to
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// the finger's own line used to clamp the anchor onto the other handle and
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// clear the selection on the very first drag event.
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func TestSelDrag_StartHandle_PressOnLineBelow_KeepsSelection(t *testing.T) {
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touchSelState2Lines()
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HandleLongPressAt(18, 108) // selects "hello" [0,5)
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checkInitialSelection(t)
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// Start handle (which=0), anchor at byte 0 (local x=0). Press at local
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// (22, 25): localY 25 is on line 1 (line height 16.8), on the finger's
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// own line x=22 is byte 14 (past SelectionEnd=5) — the original bug's
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// exact geometry. Zero vertical displacement from the grab -> the anchor
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// stays on line 0, x=22 there is byte 2: the selection shrinks to "llo"
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// but is never cleared.
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HandleSelDragEvt(ui.SelectionDragEvent{Which: 0, X: 16 + 22, Y: 100 + 25})
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HandleSelDragEvt(ui.SelectionDragEvent{Which: 0, X: 16 + 22, Y: 100 + 25})
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assertSelection(t, 2, 5)
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// Continue dragging left: x=12 on line 0 is byte 1.
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HandleSelDragEvt(ui.SelectionDragEvent{Which: 0, X: 16 + 12, Y: 100 + 25})
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assertSelection(t, 1, 5) // "ello"
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|
}
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|
|
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// TestSelDrag_EndHandle_DragDownExtendsAcrossLines is the multi-line
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|
// extension: grabbing the end handle and dragging it down more than half a
|
|
// line height moves the anchor to the next visual line (relative to the
|
|
// anchor's own line), so the selection grows across the newline — the
|
|
// native behaviour.
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|
func TestSelDrag_EndHandle_DragDownExtendsAcrossLines(t *testing.T) {
|
|
touchSelState2Lines()
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|
HandleLongPressAt(18, 108) // selects "hello" [0,5)
|
|
checkInitialSelection(t)
|
|
// End handle (which=1), anchor at byte 5 (local x=50). Grab at local
|
|
// (52, 25) — the teardrop hangs below line 0, its box centre at y≈26.8.
|
|
HandleSelDragEvt(ui.SelectionDragEvent{Which: 1, X: 16 + 52, Y: 100 + 25})
|
|
assertSelection(t, 0, 5) // grab alone does not move the anchor
|
|
// Drag down 20dp (past half a line height of 16.8): the anchor crosses
|
|
// to line 1, x=52 there is byte 17 (the 'n' of "second").
|
|
HandleSelDragEvt(ui.SelectionDragEvent{Which: 1, X: 16 + 52, Y: 100 + 45})
|
|
assertSelection(t, 0, 17) // "hello world\nsecond" minus the last d
|
|
}
|
|
|
|
// TestSelDrag_StartHandle_DragUpExtendsToLineAbove is the upward
|
|
// counterpart: grabbing the line-1 start handle (whose box sits on line 2)
|
|
// and dragging it up extends the selection onto line 0.
|
|
func TestSelDrag_StartHandle_DragUpExtendsToLineAbove(t *testing.T) {
|
|
touchSelState2Lines()
|
|
HandleLongPressAt(16+15, 100+25) // line 1, x=15: selects "second" [12,18)
|
|
checkSelection12_18(t)
|
|
// Start handle (which=0), anchor at byte 12 (line 1, local x=0). Grab at
|
|
// local (0, 43) — the box centre for a line-1 handle is at y≈43.6.
|
|
HandleSelDragEvt(ui.SelectionDragEvent{Which: 0, X: 16 + 0, Y: 100 + 43})
|
|
checkSelection12_18(t)
|
|
// A small wobble (3dp) must NOT cross lines: still line 1, x=8 -> byte 12.
|
|
HandleSelDragEvt(ui.SelectionDragEvent{Which: 0, X: 16 + 8, Y: 100 + 46})
|
|
checkSelection12_18(t)
|
|
// Drag up 20dp from the grab: the anchor crosses to line 0, x=0 there is
|
|
// byte 0.
|
|
HandleSelDragEvt(ui.SelectionDragEvent{Which: 0, X: 16 + 0, Y: 100 + 23})
|
|
assertSelection(t, 0, 18) // "hello world\nsecond"
|
|
}
|
|
|
|
func checkSelection12_18(t *testing.T) {
|
|
t.Helper()
|
|
s := TheState.Editor
|
|
if s.SelectionStart != 12 || s.SelectionEnd != 18 {
|
|
t.Fatalf("selection = [%d,%d), want [12,18)", s.SelectionStart, s.SelectionEnd)
|
|
}
|
|
}
|
|
|
|
func checkInitialSelection(t *testing.T) {
|
|
t.Helper()
|
|
s := TheState.Editor
|
|
if s.SelectionStart != 0 || s.SelectionEnd != 5 {
|
|
t.Fatalf("precondition: selection = [%d,%d), want [0,5)", s.SelectionStart, s.SelectionEnd)
|
|
}
|
|
}
|