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LibWeb: Use start-of-line in hit test of position directly to the left

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This fixes a bug where selecting from the left within a line would
begin the selection from the right, as pointed out by @AtkinsSJ in
https://github.com/SerenityOS/serenity/pull/16245#pullrequestreview-1197595820
This commit is contained in:
Andreas Oppebøen 2022-11-30 01:51:07 +01:00 committed by Andreas Kling
parent 9cab5059f8
commit 4b12def5d8
Notes: sideshowbarker 2024-07-17 03:28:46 +09:00 
Author: https://github.com/andreao
Commit: https://github.com/SerenityOS/serenity/commit/4b12def5d8
Pull-request: https://github.com/SerenityOS/serenity/pull/16256
Reviewed-by: https://github.com/awesomekling
1 changed files with 16 additions and 1 deletions
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17
Userland/Libraries/LibWeb/Painting/PaintableBox.cpp
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@ -699,8 +699,23 @@ Optional<HitTestResult> PaintableWithLines::hit_test(CSSPixelPoint position, Hit
return fragment.layout_node().paintable()->hit_test(position, type);
return HitTestResult { *fragment.layout_node().paintable(), fragment.text_index_at(position.x().value()) };
}
if (fragment_absolute_rect.top() <= position.y())
// If we reached this point, the position is not within the fragment. However, the fragment start or end might be the place to place the cursor.
// This determines whether the fragment is a good candidate for the position. The last such good fragment is chosen.
// The best candidate is either the end of the line above, the beginning of the line below, or the beginning or end of the current line.
// We arbitrarily choose to consider the end of the line above and ignore the beginning of the line below.
// If we knew the direction of selection, we could make a better choice.
if (fragment_absolute_rect.bottom() <= position.y()) { // fully below the fragment
last_good_candidate = HitTestResult { *fragment.layout_node().paintable(), fragment.start() + fragment.length() };
} else if (fragment_absolute_rect.top() <= position.y()) { // vertically within the fragment
if (position.x() < fragment_absolute_rect.left()) { // left of the fragment
if (!last_good_candidate.has_value()) { // first fragment of the line
last_good_candidate = HitTestResult { *fragment.layout_node().paintable(), fragment.start() };
}
} else { // right of the fragment
last_good_candidate = HitTestResult { *fragment.layout_node().paintable(), fragment.start() + fragment.length() };
}
}
}
}