Merge pull request #772 from Kellermorph/pdf-import

Add PDF page import as image

sources/ui/pdfpagesdialog.cpp

@@ -0,0 +1,176 @@
+/*
+	Copyright 2006-2026 The QElectroTech Team
+	This file is part of QElectroTech.
+
+	QElectroTech is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 2 of the License, or
+	(at your option) any later version.
+
+	QElectroTech is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#include "pdfpagesdialog.h"
+
+#include <QVBoxLayout>
+#include <QHBoxLayout>
+#include <QLabel>
+#include <QSpinBox>
+#include <QComboBox>
+#include <QPushButton>
+#include <QDialogButtonBox>
+#include <QPdfDocument>
+#include <QScrollArea>
+#include <QPainter>
+
+// Preview rendering DPI for the thumbnail in the dialog.
+// Fixed at 96 DPI to keep the preview fast and compact regardless
+// of the final render DPI selected by the user.
+static const int PREVIEW_DPI = 96;
+static const int PREVIEW_WIDTH = 400;
+
+/**
+	@brief PdfPagesDialog::PdfPagesDialog
+	Constructor
+	@param document the loaded PDF document to preview pages from
+	@param parent parent widget
+*/
+PdfPagesDialog::PdfPagesDialog(QPdfDocument &document, QWidget *parent)
+	: QDialog(parent),
+	  m_document(document)
+{
+	setWindowTitle(tr("Sélectionner une page"));
+	setMinimumWidth(500);
+	setMinimumHeight(500);
+
+	int pageCount = document.pageCount();
+
+	// Main layout
+	QVBoxLayout *main_layout = new QVBoxLayout(this);
+
+	// Info label: "Ce document PDF contient X page(s)"
+	m_info_label = new QLabel(
+		tr("Ce document PDF contient %n page(s)", "", pageCount),
+		this
+	);
+	m_info_label->setWordWrap(true);
+	main_layout->addWidget(m_info_label);
+
+	// Page selection layout
+	QHBoxLayout *page_layout = new QHBoxLayout();
+
+	QLabel *select_label = new QLabel(tr("Page à importer :"), this);
+	page_layout->addWidget(select_label);
+
+	// Spinbox: min=1, max=pageCount
+	m_page_spinbox = new QSpinBox(this);
+	m_page_spinbox->setMinimum(1);
+	m_page_spinbox->setMaximum(pageCount);
+	m_page_spinbox->setValue(1);
+	page_layout->addWidget(m_page_spinbox);
+
+	page_layout->addStretch();
+
+	// DPI selection
+	QLabel *dpi_label = new QLabel(tr("Résolution :"), this);
+	page_layout->addWidget(dpi_label);
+
+	m_dpi_combo = new QComboBox(this);
+	m_dpi_combo->addItem(tr("150 DPI (écran)"), 150);
+	m_dpi_combo->addItem(tr("300 DPI (impression)"), 300);
+	m_dpi_combo->addItem(tr("600 DPI (haute qualité)"), 600);
+	m_dpi_combo->setCurrentIndex(0);
+	page_layout->addWidget(m_dpi_combo);
+
+	main_layout->addLayout(page_layout);
+
+	// Preview area
+	QLabel *preview_title = new QLabel(tr("Aperçu :"), this);
+	main_layout->addWidget(preview_title);
+
+	QScrollArea *scroll_area = new QScrollArea(this);
+	scroll_area->setWidgetResizable(true);
+	scroll_area->setAlignment(Qt::AlignCenter);
+	scroll_area->setMinimumHeight(250);
+
+	m_preview_label = new QLabel(this);
+	m_preview_label->setAlignment(Qt::AlignCenter);
+	m_preview_label->setMinimumSize(200, 200);
+	m_preview_label->setStyleSheet("QLabel { background-color: white; border: 1px solid #cccccc; }");
+	scroll_area->setWidget(m_preview_label);
+	main_layout->addWidget(scroll_area, 1);
+
+	// OK/Cancel buttons
+	QDialogButtonBox *button_box = new QDialogButtonBox(
+		QDialogButtonBox::Ok | QDialogButtonBox::Cancel,
+		this
+	);
+	connect(button_box, &QDialogButtonBox::accepted, this, &QDialog::accept);
+	connect(button_box, &QDialogButtonBox::rejected, this, &QDialog::reject);
+	main_layout->addWidget(button_box);
+
+	// Update preview when spinbox or DPI changes
+	connect(m_page_spinbox, QOverload<int>::of(&QSpinBox::valueChanged),
+		this, &PdfPagesDialog::updatePreview);
+	connect(m_dpi_combo, QOverload<int>::of(&QComboBox::currentIndexChanged),
+		this, &PdfPagesDialog::updatePreview);
+
+	// Render initial preview
+	updatePreview();
+}
+
+/**
+	@brief PdfPagesDialog::selectedPage
+	@return the selected page number (1-based)
+*/
+int PdfPagesDialog::selectedPage() const
+{
+	return m_page_spinbox->value();
+}
+
+/**
+	@brief PdfPagesDialog::selectedDpi
+	@return the selected DPI value (150, 300, or 600)
+*/
+int PdfPagesDialog::selectedDpi() const
+{
+	return m_dpi_combo->currentData().toInt();
+}
+
+/**
+	@brief PdfPagesDialog::updatePreview
+	Renders the currently selected page as a thumbnail and displays it
+	in the preview label. The preview size scales with the selected DPI
+	to give a visual hint of the output quality.
+*/
+void PdfPagesDialog::updatePreview()
+{
+	int pageIndex = m_page_spinbox->value() - 1; // Convert to 0-based
+
+	// Calculate preview size: fixed width, proportional height
+	QSizeF pageSize = m_document.pagePointSize(pageIndex);
+	if (pageSize.isEmpty()) return;
+
+	qreal ratio = pageSize.height() / pageSize.width();
+	int previewHeight = qRound(PREVIEW_WIDTH * ratio);
+
+	// Render the page to QImage at preview DPI
+	QImage preview = m_document.render(pageIndex, QSize(PREVIEW_WIDTH, previewHeight));
+	if (preview.isNull()) return;
+
+	// Fill white background to handle transparent PDFs
+	QImage background(preview.size(), QImage::Format_ARGB32_Premultiplied);
+	background.fill(Qt::white);
+	QPainter painter(&background);
+	painter.drawImage(0, 0, preview);
+	painter.end();
+
+	m_preview_label->setPixmap(QPixmap::fromImage(background).scaled(
+		PREVIEW_WIDTH, previewHeight,
+		Qt::KeepAspectRatio, Qt::SmoothTransformation));
+}

sources/ui/pdfpagesdialog.h

@@ -0,0 +1,54 @@
+/*
+	Copyright 2006-2026 The QElectroTech Team
+	This file is part of QElectroTech.
+
+	QElectroTech is free software: you can redistribute it and/or modify
+	it under the terms of the GNU General Public License as published by
+	the Free Software Foundation, either version 2 of the License, or
+	(at your option) any later version.
+
+	QElectroTech is distributed in the hope that it will be useful,
+	but WITHOUT ANY WARRANTY; without even the implied warranty of
+	MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+	GNU General Public License for more details.
+
+	You should have received a copy of the GNU General Public License
+	along with QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#ifndef PDFPAGESDIALOG_H
+#define PDFPAGESDIALOG_H
+
+#include <QDialog>
+
+class QSpinBox;
+class QComboBox;
+class QLabel;
+class QPdfDocument;
+
+/**
+	@brief The PdfPagesDialog class
+	Dialog for selecting a page from a PDF document.
+	Displays the total page count, a live preview of the selected page,
+ DPI options (150/300/600), and allows the user to choose which page to import.
+*/
+class PdfPagesDialog : public QDialog
+{
+	Q_OBJECT
+
+	public:
+		explicit PdfPagesDialog(QPdfDocument &document, QWidget *parent = nullptr);
+		int selectedPage() const;
+		int selectedDpi() const;
+
+	private slots:
+		void updatePreview();
+
+	private:
+		QPdfDocument &m_document;
+		QLabel *m_info_label;
+		QLabel *m_preview_label;
+		QSpinBox *m_page_spinbox;
+		QComboBox *m_dpi_combo;
+};
+
+#endif // PDFPAGESDIALOG_H