Alex Spataru
142 lines
4.4 KiB
C++
142 lines
4.4 KiB
C++
/*
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* Copyright (c) 2023 Alex Spataru <https://github.com/alex-spataru>
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this software and associated documentation files (the "Software"), to deal
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* in the Software without restriction, including without limitation the rights
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* to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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* copies of the Software, and to permit persons to whom the Software is
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* furnished to do so, subject to the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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* OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
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* THE SOFTWARE.
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*/
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#include "MainWindow.h"
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#include <QFile>
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#include <QFileDialog>
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#include <QStandardPaths>
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/**
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* Constructor function, initializes the user interface & setups signals/slots.
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*/
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MainWindow::MainWindow()
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{
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// Initialize layout-related widgets
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m_centralWidget = new QWidget(this);
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m_header = new QWidget(m_centralWidget);
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// Initialize horizontal layout widgets
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m_label = new QLabel(tr("Message") + ": ", m_header);
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m_saveButton = new QPushButton(tr("Export QR Code"), m_header);
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m_lineEdit = new QLineEdit(m_header);
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// Initialize QR code image label
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m_qrCodeDisplay = new QLabel(m_centralWidget);
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m_qrCodeDisplay->setMinimumSize(QSize(500, 500));
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m_qrCodeDisplay->setMaximumSize(QSize(500, 500));
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// Setup horizontal layout for line edit & push button
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m_verticalLayout = new QVBoxLayout(m_centralWidget);
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m_headerLayout = new QHBoxLayout(m_header);
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m_headerLayout->addWidget(m_label);
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m_headerLayout->addWidget(m_lineEdit);
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m_headerLayout->addWidget(m_saveButton);
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m_headerLayout->setContentsMargins(0, 0, 0, 0);
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m_headerLayout->setStretch(1, 1);
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// Setup vertical layout with QR code label & QR code generation controls
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m_verticalLayout->addWidget(m_header);
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m_verticalLayout->addWidget(m_qrCodeDisplay);
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m_verticalLayout->setStretch(0, 1);
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// Set central widget & resize window to minimum size possible
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setCentralWidget(m_centralWidget);
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setFixedSize(minimumSize());
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// Set window title
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setWindowTitle(tr("QR Code Generator"));
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// Update the QR code when the text changes
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connect(m_lineEdit, &QLineEdit::textChanged, this,
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[this](const QString &text) {
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m_saveButton->setEnabled(!text.isEmpty());
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if (!text.isEmpty())
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generateQrCode();
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});
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// Export QR code as when user clicks on the save button
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connect(m_saveButton, &QPushButton::clicked, this, &MainWindow::saveQrCode);
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// Set "Hello World" text & generate QR code
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m_lineEdit->setText(tr("Hello World!"));
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generateQrCode();
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}
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/**
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* Destructor function.
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*/
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MainWindow::~MainWindow()
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{
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delete m_label;
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delete m_lineEdit;
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delete m_saveButton;
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delete m_qrCodeDisplay;
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delete m_headerLayout;
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delete m_verticalLayout;
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delete m_header;
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delete m_centralWidget;
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}
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/**
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* Generates a QR code from text input & saves it as a SVG file.
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*/
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void MainWindow::saveQrCode()
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{
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// Obtain SVG data for QR code
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auto svg = m_generator.generateSvgQr(m_lineEdit->text());
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if (svg.isEmpty())
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return;
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// Ask user where to save the SVG file
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auto path = QFileDialog::getSaveFileName(this, tr("Save QR Code"),
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QDir::homePath(), tr("*.svg"));
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// Write SVG data into the file selected by the user
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if (!path.isEmpty())
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{
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QFile file(path);
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if (file.open(QFile::WriteOnly))
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{
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file.write(svg.toUtf8());
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file.close();
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}
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}
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}
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/**
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* Generates a QR code from text input & displays it in the UI.
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*/
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void MainWindow::generateQrCode()
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{
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// Get text from line edit
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auto text = m_lineEdit->text();
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// Generate QR code from text
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QImage unscaledImage = m_generator.generateQr(text);
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QImage image = unscaledImage.scaled(500, 500);
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// Display generated image
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m_qrCodeDisplay->setPixmap(QPixmap::fromImage(image));
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m_qrCodeDisplay->setToolTip(text);
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}
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