Issue #118: First part of splitting

Pdf4QtLibWidgets/sources/pdfwidgetutils.cpp

@@ -0,0 +1,212 @@
+//    Copyright (C) 2019-2022 Jakub Melka
+//
+//    This file is part of PDF4QT.
+//
+//    PDF4QT is free software: you can redistribute it and/or modify
+//    it under the terms of the GNU Lesser General Public License as published by
+//    the Free Software Foundation, either version 3 of the License, or
+//    with the written consent of the copyright owner, any later version.
+//
+//    PDF4QT 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 Lesser General Public License for more details.
+//
+//    You should have received a copy of the GNU Lesser General Public License
+//    along with PDF4QT.  If not, see <https://www.gnu.org/licenses/>.
+
+#include "pdfwidgetutils.h"
+#include "pdfcolorconvertor.h"
+#include "pdfdbgheap.h"
+
+#include <QDialog>
+#include <QLayout>
+#include <QPainter>
+#include <QPixmap>
+#include <QGroupBox>
+#include <QApplication>
+
+#ifdef Q_OS_MAC
+int qt_default_dpi_x() { return 72; }
+int qt_default_dpi_y() { return 72; }
+#else
+int qt_default_dpi_x() { return 96; }
+int qt_default_dpi_y() { return 96; }
+#endif
+
+namespace pdf
+{
+
+static constexpr bool isScalingNeeded()
+{
+    return QT_VERSION_MAJOR < 6;
+}
+
+int PDFWidgetUtils::getPixelSize(const QPaintDevice* device, pdf::PDFReal sizeMM)
+{
+    const int width = device->width();
+    const int height = device->height();
+
+    if (width > height)
+    {
+        return PDFReal(width) * sizeMM / PDFReal(device->widthMM());
+    }
+    else
+    {
+        return PDFReal(height) * sizeMM / PDFReal(device->heightMM());
+    }
+}
+
+int PDFWidgetUtils::scaleDPI_x(const QPaintDevice* device, int unscaledSize)
+{
+    if constexpr (isScalingNeeded())
+    {
+        const double logicalDPI_x = device->logicalDpiX();
+        const double defaultDPI_x = qt_default_dpi_x();
+        return (logicalDPI_x / defaultDPI_x) * unscaledSize;
+    }
+    else
+    {
+        return unscaledSize;
+    }
+}
+
+int PDFWidgetUtils::scaleDPI_y(const QPaintDevice* device, int unscaledSize)
+{
+    if constexpr (isScalingNeeded())
+    {
+        const double logicalDPI_y = device->logicalDpiY();
+        const double defaultDPI_y = qt_default_dpi_y();
+        return (logicalDPI_y / defaultDPI_y) * unscaledSize;
+    }
+    else
+    {
+        return unscaledSize;
+    }
+}
+
+PDFReal PDFWidgetUtils::scaleDPI_x(const QPaintDevice* device, PDFReal unscaledSize)
+{
+    if constexpr (isScalingNeeded())
+    {
+        const double logicalDPI_x = device->logicalDpiX();
+        const double defaultDPI_x = qt_default_dpi_x();
+        return (logicalDPI_x / defaultDPI_x) * unscaledSize;
+    }
+    else
+    {
+        return unscaledSize;
+    }
+}
+
+void PDFWidgetUtils::scaleWidget(QWidget* widget, QSize unscaledSize)
+{
+    if constexpr (!isScalingNeeded())
+    {
+        return;
+    }
+
+    const double logicalDPI_x = widget->logicalDpiX();
+    const double logicalDPI_y = widget->logicalDpiY();
+    const double defaultDPI_x = qt_default_dpi_x();
+    const double defaultDPI_y = qt_default_dpi_y();
+
+    const int width = (logicalDPI_x / defaultDPI_x) * unscaledSize.width();
+    const int height = (logicalDPI_y / defaultDPI_y) * unscaledSize.height();
+
+    widget->resize(width, height);
+}
+
+QSize PDFWidgetUtils::scaleDPI(const QPaintDevice* widget, QSize unscaledSize)
+{
+    if constexpr (isScalingNeeded())
+    {
+        const double logicalDPI_x = widget->logicalDpiX();
+        const double logicalDPI_y = widget->logicalDpiY();
+        const double defaultDPI_x = qt_default_dpi_x();
+        const double defaultDPI_y = qt_default_dpi_y();
+
+        const int width = (logicalDPI_x / defaultDPI_x) * unscaledSize.width();
+        const int height = (logicalDPI_y / defaultDPI_y) * unscaledSize.height();
+
+        return QSize(width, height);
+    }
+    else
+    {
+        return unscaledSize;
+    }
+}
+
+void PDFWidgetUtils::style(QWidget* widget)
+{
+    const int dialogMarginX = scaleDPI_x(widget, 12);
+    const int dialogMarginY = scaleDPI_y(widget, 12);
+    const int dialogSpacing = scaleDPI_y(widget, 12);
+
+    const int groupBoxMarginX = scaleDPI_x(widget, 20);
+    const int groupBoxMarginY = scaleDPI_y(widget, 20);
+    const int groupBoxSpacing = scaleDPI_y(widget, 12);
+
+    QList<QWidget*> childWidgets = widget->findChildren<QWidget*>();
+    childWidgets.append(widget);
+
+    for (QWidget* childWidget : childWidgets)
+    {
+        if (qobject_cast<QGroupBox*>(childWidget))
+        {
+            childWidget->layout()->setContentsMargins(groupBoxMarginX, groupBoxMarginY, groupBoxMarginX, groupBoxMarginY);
+            childWidget->layout()->setSpacing(groupBoxSpacing);
+        }
+        else if (qobject_cast<QDialog*>(childWidget))
+        {
+            childWidget->layout()->setContentsMargins(dialogMarginX, dialogMarginY, dialogMarginX, dialogMarginY);
+            childWidget->layout()->setSpacing(dialogSpacing);
+        }
+    }
+}
+
+bool PDFWidgetUtils::isDarkTheme()
+{
+    QPalette palette = QApplication::palette();
+    QColor backgroundColor = palette.color(QPalette::Window);
+    QColor textColor = palette.color(QPalette::WindowText);
+
+    return backgroundColor.lightness() < textColor.lightness();
+}
+
+void PDFWidgetUtils::convertActionForDarkTheme(QAction* action, QSize iconSize, qreal devicePixelRatioF)
+{
+    if (!action)
+    {
+        return;
+    }
+
+    QIcon icon = action->icon();
+    if (!icon.isNull())
+    {
+        icon = pdf::PDFWidgetUtils::convertIconForDarkTheme(icon, iconSize, devicePixelRatioF);
+        action->setIcon(icon);
+    }
+}
+
+QIcon PDFWidgetUtils::convertIconForDarkTheme(QIcon icon, QSize iconSize, qreal devicePixelRatioF)
+{
+    QPixmap pixmap(iconSize * devicePixelRatioF);
+    pixmap.setDevicePixelRatio(devicePixelRatioF);
+    pixmap.fill(Qt::transparent);
+
+    QPainter painter(&pixmap);
+    icon.paint(&painter, QRect(0, 0, iconSize.width(), iconSize.height()));
+    painter.end();
+
+    PDFColorConvertor convertor;
+    convertor.setMode(PDFColorConvertor::Mode::InvertedColors);
+
+    QImage image = pixmap.toImage();
+    image = convertor.convert(image);
+    pixmap = QPixmap::fromImage(image);
+
+    return QIcon(pixmap);
+}
+
+} // namespace pdf