Issue #118: First part of splitting

Pdf4QtLibWidgets/sources/pdfwidgetutils.h

@@ -0,0 +1,94 @@
+//    Copyright (C) 2019-2021 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/>.
+
+#ifndef PDFWIDGETUTILS_H
+#define PDFWIDGETUTILS_H
+
+#include "pdfglobal.h"
+
+#include <QIcon>
+#include <QWidget>
+
+namespace pdf
+{
+
+class PDF4QTLIBSHARED_EXPORT PDFWidgetUtils
+{
+public:
+    PDFWidgetUtils() = delete;
+
+    /// Converts size in MM to pixel size
+    static int getPixelSize(const QPaintDevice* device, pdf::PDFReal sizeMM);
+
+    /// Scale horizontal DPI value
+    /// \param device Paint device to obtain logical DPI for scaling
+    static int scaleDPI_x(const QPaintDevice* device, int unscaledSize);
+
+    /// Scale vertical DPI value
+    /// \param device Paint device to obtain logical DPI for scaling
+    static int scaleDPI_y(const QPaintDevice* device, int unscaledSize);
+
+    /// Scale horizontal DPI value
+    /// \param device Paint device to obtain logical DPI for scaling
+    static PDFReal scaleDPI_x(const QPaintDevice* device, PDFReal unscaledSize);
+
+    /// Scales widget based on DPI
+    /// \param widget Widget to be scaled
+    /// \param unscaledSize Unscaled size of the widget
+    static void scaleWidget(QWidget* widget, QSize unscaledSize);
+
+    /// Scales size based on DPI
+    /// \param device Paint device to obtain logical DPI for scaling
+    /// \param unscaledSize Unscaled size
+    static QSize scaleDPI(const QPaintDevice* widget, QSize unscaledSize);
+
+    /// Apply style to the widget
+    static void style(QWidget* widget);
+
+    /// Vrátí true, pokud je aktuálně nastavená dark theme
+    /// pro aplikaci.
+    static bool isDarkTheme();
+
+    /// Converts an action's icon for use in a dark theme.
+    /// \param action Pointer to the QAction to be converted.
+    /// \param iconSize The size of the action's icon.
+    /// \param devicePixelRatioF The device pixel ratio factor.
+    static void convertActionForDarkTheme(QAction* action, QSize iconSize, qreal devicePixelRatioF);
+
+    /// Converts an icon for use in a dark theme.
+    /// \param icon The icon to be converted.
+    /// \param iconSize The size of the icon.
+    /// \param devicePixelRatioF The device pixel ratio factor.
+    static QIcon convertIconForDarkTheme(QIcon icon, QSize iconSize, qreal devicePixelRatioF);
+
+    /// Converts an action's icon for use in a dark theme.
+    /// \param action Pointer to the QAction to be converted.
+    /// \param iconSize The size of the action's icon.
+    /// \param devicePixelRatioF The device pixel ratio factor.
+    template<typename Container>
+    static void convertActionsForDarkTheme(const Container& actions, QSize iconSize, qreal devicePixelRatioF)
+    {
+        for (QAction* action : actions)
+        {
+            convertActionForDarkTheme(action, iconSize, devicePixelRatioF);
+        }
+    }
+};
+
+} // namespace pdf
+
+#endif // PDFWIDGETUTILS_H