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Reuse code from the file transfer widget to provide an image preview on paste/grab. This prevents users from accidentally sending images they did not mean to when their clipboard is not in the state they thought it was. Implementation exposes the genericchatlog vbox to the child classes and chatform injects the imagepreview into it.reviewable/pr6175/r3
Mick Sayson
6 years ago
committed by
Anthony Bilinski
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 @@ |
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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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|
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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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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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