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Symbols, free texts, shapes and pictures can be grouped from the Edit menu, the selection's context menu or the command search. Clicking one member selects the group, so moving, copying and deleting act on all of it; Ctrl+click on a member deselects the group; a rubber band touching part of a group selects all of it when released. No default shortcut: Ctrl+G is "jump to element". A group is not an object in the scene. Each member keeps its place and carries the group's uuid (QGraphicsItem::data()), saved as a "group" attribute written only when set: a project without groups saves exactly as before, and older versions open a grouped one and ignore the groups. Re-parenting under a QGraphicsItemGroup would have made every member's position group-relative; ElementTextItemGroup already needs nine special cases for that. - Selection is completed on clicks and at the end of a rubber band, not on every selectionChanged(): export, search and Tab select items themselves and must not have groups pulled back in. - Project database: group_uuid on element, shape, independent_text and image, kept in step by projectDataBase::itemGroupChanged(). - Paste and folio duplication give each source group one new uuid. - Undo of Ungroup restores each item's exact group. Builds on #1065 (uuids and database rows for texts, shapes and images). Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01G2d2Zi8BfrYRPX88zhaoFG
61 lines
2.0 KiB
C++
61 lines
2.0 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 ITEMGROUPS_H
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#define ITEMGROUPS_H
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#include <QList>
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#include <QUuid>
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class QDomElement;
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class QGraphicsItem;
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class QGraphicsScene;
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/**
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Groups of items on a folio (discussion #1070): symbols, free texts,
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shapes and pictures that select, move, copy and delete together.
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A group is not an object in the scene. Each member keeps its place and
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carries the group's uuid, and selecting one member selects them all;
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moving, copying and deleting then need nothing new, because they act on
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the selection. Re-parenting the members under a QGraphicsItemGroup would
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make every position group-relative, which every piece of code reading a
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symbol's position would have to learn about.
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This part knows nothing of Diagram, so it can be tested on a plain scene.
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*/
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namespace ItemGroups
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{
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/// QGraphicsItem::data() key holding an item's group uuid.
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inline constexpr int data_key = 0x475250; // "GRP"
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/// XML attribute holding it, on <element>, <input>, <shape> and <image>.
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inline constexpr char xml_attribute[] = "group";
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QUuid groupOf(const QGraphicsItem *item);
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void setGroup(QGraphicsItem *item, const QUuid &group);
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void write(QDomElement &xml, const QGraphicsItem *item);
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QUuid read(const QDomElement &xml);
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bool completeSelection(QGraphicsScene *scene,
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const QList<QGraphicsItem *> &previous,
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bool toggling);
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}
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#endif // ITEMGROUPS_H
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