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The text properties showed and edited the top-left corner of a text, whatever its alignment, and changing the alignment did not move the text. A right-aligned label next to a symbol therefore needed a different X for every text length to keep the same gap (#1155). Position X/Y is now the anchor point: the point of the text chosen by the alignment (right edge for "right", middle for "centre"...). Typing a position puts that point there, and changing the alignment moves the text so that the new anchor point is on the same X/Y. It is the same point that already stays fixed when the text changes. Applies to the element text properties on a folio and to the text field properties in the symbol editor. The saved x/y is still the top-left corner, so projects and symbols load and save unchanged and look the same; only the numbers shown for texts that are not top-left aligned change. The geometry is in textanchor.h, shared by DiagramTextItem and PartDynamicTextField, and tested in tst_textanchor. Not changed: static texts of the symbol editor (PartText), whose position is tied to the font baseline; texts inside a text group, which have no position or alignment of their own; rotation still pivots on the top-left corner (or the centre), not on the anchor. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
83 lines
2.4 KiB
C++
83 lines
2.4 KiB
C++
/*
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Copyright 2006-2026 The QElectroTech Team
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This file is part of QElectroTech.
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QElectroTech is free software: you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation, either version 2 of the License, or
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(at your option) any later version.
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QElectroTech is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with QElectroTech. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef TEXTANCHOR_H
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#define TEXTANCHOR_H
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#include <QGraphicsItem>
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#include <QPointF>
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#include <QRectF>
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/**
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The anchor point of a text: the point of the text chosen by its
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alignment (top-left, right edge, centre...). It is the point that
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stays in place when the text changes, and the point shown as
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"Position X/Y" in the text properties.
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The saved position of a text is still its top-left corner (pos()),
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so existing projects and symbols are read and written unchanged.
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*/
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namespace TextAnchor
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{
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/**
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@return the point of rect chosen by alignment, in the
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coordinates of rect. Left and top are x = 0 and y = 0, as
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finishAlignment() of the text items assumes.
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*/
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inline QPointF localPoint(const QRectF &rect, Qt::Alignment alignment)
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{
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qreal x = 0, y = 0;
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if (alignment & Qt::AlignRight)
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x = rect.right();
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else if (alignment & Qt::AlignHCenter)
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x = rect.center().x();
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if (alignment & Qt::AlignBottom)
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y = rect.bottom();
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else if (alignment & Qt::AlignVCenter)
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y = rect.center().y();
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return QPointF(x, y);
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}
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/**
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@return the anchor point of item for alignment, in parent
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coordinates. For a top-left alignment this is item->pos().
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The rotation of the item is taken into account.
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*/
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inline QPointF pos(const QGraphicsItem *item, Qt::Alignment alignment)
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{
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return item->pos()
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+ item->mapToParent(localPoint(item->boundingRect(), alignment))
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- item->mapToParent(QPointF(0, 0));
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}
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/**
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@return the position (top-left corner) to give to item so that
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its anchor point for alignment is at anchor.
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*/
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inline QPointF itemPosFor(const QGraphicsItem *item,
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Qt::Alignment alignment,
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const QPointF &anchor)
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{
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return item->pos() + anchor - pos(item, alignment);
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}
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}
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#endif // TEXTANCHOR_H
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