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Beat Hangartner
360065036c
Pictures dropped together were cascaded 20 px apart from the drop point; once scaled to fit the folio they lay almost on top of each other. They are now laid out side by side in a roughly square grid over the folio's drawing area, inside the same 20 % margin, each shrunk into its cell with its proportions kept. A single dropped picture still lands on the drop point. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
92 lines
3.1 KiB
C++
92 lines
3.1 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 IMAGEDROP_H
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#define IMAGEDROP_H
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#include <QImage>
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#include <QPointF>
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#include <QRectF>
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#include <QSizeF>
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#include <QList>
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#include <QStringList>
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class QMimeData;
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/**
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Picture files dropped on a folio: which files qualify, how they are
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loaded, and where they are placed. Kept free of any QElectroTech class
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so that it can be tested on its own.
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*/
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namespace ImageDrop
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{
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/// Pictures are embedded in the project, so larger files are refused.
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constexpr qint64 maxFileBytes = 10LL * 1024 * 1024;
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/// Refuses decompression bombs before any pixel is allocated.
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constexpr qint64 maxPixels = 64LL * 1024 * 1024;
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/// Space left between the pictures of one drop laid out in a grid, as
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/// a share of a grid cell.
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constexpr qreal gridGap = 0.05;
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/// Free margin left between a scaled-down picture and the folio frame,
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/// as a share of the frame on each side.
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constexpr qreal frameMargin = 0.2;
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/// The suffixes the "add image" file dialog offers, lower case.
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QStringList supportedSuffixes();
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/// The local picture files among the URLs of @a mime, in drop order.
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QStringList imageFiles(const QMimeData *mime);
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/// True when @a mime carries URLs and none of them is a picture file:
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/// the drop is meant for someone else (a .qet project, an element).
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bool hasOnlyOtherUrls(const QMimeData *mime);
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/**
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Load the picture at @a path, checking that it is a regular file of
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at most maxFileBytes and maxPixels. On failure the image is null
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and @a error, if given, says why.
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*/
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QImage load(const QString &path, QString *error = nullptr);
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/// @a frame shrunk by frameMargin on every side.
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QRectF innerFrame(const QRectF &frame);
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/**
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Scale that fits a picture of @a size into innerFrame(@a frame),
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keeping its proportions; 1.0 when it already fits. Pictures are
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never enlarged.
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*/
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qreal fitScale(const QSizeF &size, const QRectF &frame);
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/**
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@a picture moved by the least amount that puts it inside @a area;
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centred on @a area along an axis where it is larger.
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*/
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QRectF keepInside(const QRectF &picture, const QRectF &area);
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/**
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Lay out pictures of @a sizes, dropped together, side by side in a
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grid filling @a area: as many columns as needed for a roughly
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square grid, every picture shrunk -- never enlarged -- into its
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cell, proportions kept, and centred in it.
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@return where each picture goes, in the order of @a sizes
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*/
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QList<QRectF> gridLayout(const QList<QSizeF> &sizes, const QRectF &area);
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}
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#endif // IMAGEDROP_H
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