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Improve PDF import: DPI selection, page preview, Qt5 compat, custom icon

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- Add DPI selection (150/300/600) to the page selection dialog
- Add live page preview in the selection dialog
- Conditionally compile PDF import only for Qt6 (#if QT_VERSION)
- Add custom pdf-import icon (PDF document with + symbol)
- Register new icon in qelectrotech.qrc
- Qt5 builds: PDF import action is hidden, everything else works as before
This commit is contained in:
Kellermorph
2026-08-22 18:53:36 +02:00
parent baf95338a3
commit ff25a77159
8 changed files with 83 additions and 37 deletions
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sources/ui/pdfpagesdialog.cpp
+36 -10
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@@ -21,6 +21,7 @@
#include <QHBoxLayout>
#include <QLabel>
#include <QSpinBox>
#include <QComboBox>
#include <QPushButton>
#include <QDialogButtonBox>
#include <QPdfDocument>
@@ -28,8 +29,10 @@
#include <QPainter>
// Preview rendering DPI for the thumbnail in the dialog.
// Lower than the final render DPI to keep the dialog fast and compact.
// 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
@@ -43,7 +46,7 @@ PdfPagesDialog::PdfPagesDialog(QPdfDocument &document, QWidget *parent)
{
setWindowTitle(tr("Sélectionner une page"));
setMinimumWidth(500);
setMinimumHeight(400);
setMinimumHeight(500);
int pageCount = document.pageCount();
@@ -71,6 +74,19 @@ PdfPagesDialog::PdfPagesDialog(QPdfDocument &document, QWidget *parent)
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
@@ -98,9 +114,11 @@ PdfPagesDialog::PdfPagesDialog(QPdfDocument &document, QWidget *parent)
connect(button_box, &QDialogButtonBox::rejected, this, &QDialog::reject);
main_layout->addWidget(button_box);
// Update preview when spinbox value changes
// 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();
@@ -115,11 +133,20 @@ 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. Uses a fixed preview width of 400 pixels
while preserving the page aspect ratio.
in the preview label. The preview size scales with the selected DPI
to give a visual hint of the output quality.
*/
void PdfPagesDialog::updatePreview()
{
@@ -129,12 +156,11 @@ void PdfPagesDialog::updatePreview()
QSizeF pageSize = m_document.pagePointSize(pageIndex);
if (pageSize.isEmpty()) return;
const int previewWidth = 400;
qreal ratio = pageSize.height() / pageSize.width();
int previewHeight = qRound(previewWidth * ratio);
int previewHeight = qRound(PREVIEW_WIDTH * ratio);
// Render the page to QImage
QImage preview = m_document.render(pageIndex, QSize(previewWidth, previewHeight));
// 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
@@ -145,6 +171,6 @@ void PdfPagesDialog::updatePreview()
painter.end();
m_preview_label->setPixmap(QPixmap::fromImage(background).scaled(
previewWidth, previewHeight,
PREVIEW_WIDTH, previewHeight,
Qt::KeepAspectRatio, Qt::SmoothTransformation));
}