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Beat Hangartner
c76bc5eb4e
A dropped picture too large for the folio is now scaled to leave 20 % of the drawing area free on every side, instead of being fitted to the visible part of the view, and every dropped picture is kept inside the frame -- a scaled-down one also off that margin. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
84 lines
2.8 KiB
C++
84 lines
2.8 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 <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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/// Offset between the pictures of one drop, in scene units.
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constexpr qreal cascadeStep = 20.0;
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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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/// Offset of the @a index-th picture of one drop from the first one.
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QPointF cascadeOffset(int index);
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}
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#endif // IMAGEDROP_H
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