mirror of
https://github.com/qelectrotech/qelectrotech-source-mirror.git
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Laurent Trinques
66 lines
2.2 KiB
C++
66 lines
2.2 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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QGraphicsItem *groupedItem(QGraphicsItem *item);
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QGraphicsItem *memberToPick(QGraphicsItem *hit);
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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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QUuid soleWholeGroup(const QList<QGraphicsItem *> &selected);
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}
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#endif // ITEMGROUPS_H
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