mirror of https://github.com/qTox/qTox.git
Anthony Bilinski
4 years ago
12 changed files with 232 additions and 81 deletions
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/*
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Copyright © 2020 by The qTox Project Contributors |
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This file is part of qTox, a Qt-based graphical interface for Tox. |
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qTox is libre 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 3 of the License, or |
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(at your option) any later version. |
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qTox 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 qTox. If not, see <http://www.gnu.org/licenses/>.
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*/ |
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#include "imagepreviewwidget.h" |
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#include "src/model/exiftransform.h" |
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#include <QFile> |
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#include <QFileInfo> |
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#include <QString> |
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#include <QApplication> |
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#include <QDesktopWidget> |
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#include <QBuffer> |
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namespace |
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{ |
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QPixmap pixmapFromFile(const QString& filename) |
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{ |
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static const QStringList previewExtensions = {"png", "jpeg", "jpg", "gif", "svg", |
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"PNG", "JPEG", "JPG", "GIF", "SVG"}; |
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if (!previewExtensions.contains(QFileInfo(filename).suffix())) { |
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return QPixmap(); |
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} |
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QFile imageFile(filename); |
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if (!imageFile.open(QIODevice::ReadOnly)) { |
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return QPixmap(); |
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} |
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const QByteArray imageFileData = imageFile.readAll(); |
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QImage image = QImage::fromData(imageFileData); |
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auto orientation = ExifTransform::getOrientation(imageFileData); |
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image = ExifTransform::applyTransformation(image, orientation); |
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return QPixmap::fromImage(image); |
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} |
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QPixmap scaleCropIntoSquare(const QPixmap& source, const int targetSize) |
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{ |
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QPixmap result; |
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// Make sure smaller-than-icon images (at least one dimension is smaller) will not be
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// upscaled
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if (source.width() < targetSize || source.height() < targetSize) { |
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result = source; |
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} else { |
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result = source.scaled(targetSize, targetSize, Qt::KeepAspectRatioByExpanding, |
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Qt::SmoothTransformation); |
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} |
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// Then, image has to be cropped (if needed) so it will not overflow rectangle
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// Only one dimension will be bigger after Qt::KeepAspectRatioByExpanding
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if (result.width() > targetSize) { |
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return result.copy((result.width() - targetSize) / 2, 0, targetSize, targetSize); |
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} else if (result.height() > targetSize) { |
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return result.copy(0, (result.height() - targetSize) / 2, targetSize, targetSize); |
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} |
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// Picture was rectangle in the first place, no cropping
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return result; |
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} |
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QString getToolTipDisplayingImage(const QPixmap& image) |
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{ |
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// Show mouseover preview, but make sure it's not larger than 50% of the screen
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// width/height
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const QRect desktopSize = QApplication::desktop()->geometry(); |
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const int maxPreviewWidth{desktopSize.width() / 2}; |
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const int maxPreviewHeight{desktopSize.height() / 2}; |
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const QPixmap previewImage = [&image, maxPreviewWidth, maxPreviewHeight]() { |
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if (image.width() > maxPreviewWidth || image.height() > maxPreviewHeight) { |
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return image.scaled(maxPreviewWidth, maxPreviewHeight, Qt::KeepAspectRatio, |
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Qt::SmoothTransformation); |
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} else { |
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return image; |
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} |
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}(); |
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QByteArray imageData; |
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QBuffer buffer(&imageData); |
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buffer.open(QIODevice::WriteOnly); |
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previewImage.save(&buffer, "PNG"); |
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buffer.close(); |
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return "<img src=data:image/png;base64," + imageData.toBase64() + "/>"; |
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} |
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} // namespace
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void ImagePreviewButton::initialize(const QPixmap& image) |
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{ |
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auto desiredSize = qMin(width(), height()); // Assume widget is a square
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desiredSize = qMax(desiredSize, 4) - 4; // Leave some room for a border
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auto croppedImage = scaleCropIntoSquare(image, desiredSize); |
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setIcon(QIcon(croppedImage)); |
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setIconSize(croppedImage.size()); |
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setToolTip(getToolTipDisplayingImage(image)); |
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} |
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void ImagePreviewButton::setIconFromFile(const QString& filename) |
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{ |
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initialize(pixmapFromFile(filename)); |
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} |
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void ImagePreviewButton::setIconFromPixmap(const QPixmap& pixmap) |
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{ |
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initialize(pixmap); |
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} |
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@ -0,0 +1,37 @@
@@ -0,0 +1,37 @@
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/*
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Copyright © 2020 by The qTox Project Contributors |
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|
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This file is part of qTox, a Qt-based graphical interface for Tox. |
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|
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qTox is libre 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 3 of the License, or |
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(at your option) any later version. |
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|
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qTox 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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|
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You should have received a copy of the GNU General Public License |
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along with qTox. If not, see <http://www.gnu.org/licenses/>.
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*/ |
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#pragma once |
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#include <QPushButton> |
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#include <QPixmap> |
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#include <QString> |
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class ImagePreviewButton : public QPushButton |
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{ |
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public: |
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ImagePreviewButton(QWidget* parent = nullptr) |
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: QPushButton(parent) |
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{} |
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void setIconFromFile(const QString& filename); |
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void setIconFromPixmap(const QPixmap& image); |
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private: |
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void initialize(const QPixmap& image); |
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}; |
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