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widget: introduce caret indexing to Editor

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An efficient index replaces all other ad-hoc caret positioning methods.

Signed-off-by: Elias Naur <mail@eliasnaur.com>
This commit is contained in:
Elias Naur
2022-02-04 18:11:27 +01:00
parent 3614782e0d
commit b9e8c4eda8
2 changed files with 108 additions and 11 deletions
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widget/editor_test.go
+5 -2
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@@ -151,7 +151,9 @@ func TestEditorCaretConsistency(t *testing.T) {
t.Helper()
gotLine, gotCol := e.CaretPos()
gotCoords := e.CaretCoords()
want := e.offsetToScreenPos(combinedPos{}, e.caret.start.ofs)
// Blow away index to re-compute position from scratch.
e.invalidate()
want := e.closestPosition(combinedPos{runes: e.caret.start.runes})
wantCoords := f32.Pt(float32(want.x)/64, float32(want.y))
if want.lineCol.Y != gotLine || want.lineCol.X != gotCol || gotCoords != wantCoords {
return fmt.Errorf("caret (%d,%d) pos %s, want (%d,%d) pos %s",
@@ -486,7 +488,8 @@ g123456789g
_ = e.Events() // throw away any events from this layout
// Build the selection events
startPos, endPos := e.offsetToScreenPos2(sortInts(start, end))
startPos := e.closestPosition(combinedPos{runes: start})
endPos := e.closestPosition(combinedPos{runes: end})
tq := &testQueue{
events: []event.Event{
pointer.Event{