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Fixup 824d1c99: do not change the semantics of leftMargin(pit_type)

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In the row painter, when painting a centered label, one wants to get
the left/right margin of the non-first rows (without indent). It was a
bad idea to change leftMargin(pit) to do that, because its semantics
are unclear and the the code depends on the fact that this function does
strange things when the paragraph is empty...

Fixes bug #12118.
This commit is contained in:
Jean-Marc Lasgouttes 2021-02-16 20:22:46 +01:00
parent 37392dcc72
commit 3f093dd103
2 changed files with 10 additions and 7 deletions
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10
src/RowPainter.cpp
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@ -457,14 +457,16 @@ void RowPainter::paintTopLevelLabel() const
double x = x_;
if (layout.labeltype == LABEL_CENTERED) {
// The 'size + 1' is weird, but it makes sure that we get the
// left margin of non-first row.
int leftm = tm_.leftMargin(row_.pit(), par_.size() + 1);
int rightm = tm_.rightMargin(row_.pit());
if (row_.isRTL())
swap(leftm, rightm);
/* Currently, x points at row_.left_margin (which contains the
* indent). First remove that, and then center the title with
* respect to the left and right margins.
*/
int const leftm = row_.isRTL() ? tm_.rightMargin(row_.pit())
: tm_.leftMargin(row_.pit());
int const rightm = row_.isRTL() ? tm_.leftMargin(row_.pit())
: tm_.rightMargin(row_.pit());
x += leftm - row_.left_margin + (tm_.width() - leftm -rightm) / 2
- fm.width(str) / 2;
} else if (row_.isRTL()) {

7
src/TextMetrics.cpp
View File

@ -1621,8 +1621,9 @@ void TextMetrics::deleteLineForward(Cursor & cur)
int TextMetrics::leftMargin(pit_type pit) const
{
// the + 1 is useful when the paragraph is empty
return leftMargin(pit, text_->paragraphs()[pit].size() + 1);
// FIXME: what is the semantics? It depends on whether the
// paragraph is empty!
return leftMargin(pit, text_->paragraphs()[pit].size());
}
@ -1635,7 +1636,7 @@ int TextMetrics::leftMargin(pit_type const pit, pos_type const pos) const
Paragraph const & par = pars[pit];
LASSERT(pos >= 0, return 0);
// We do not really care whether pos > par.size(), since we do not
// access the data. It can be actially useful, when querying the
// access the data. It can be actually useful, when querying the
// margin without indentation (see leftMargin(pit_type).
Buffer const & buffer = bv_->buffer();