From b4923d1c584a4dce794d91a4b090a5293569223a Mon Sep 17 00:00:00 2001
From: Kacper Donat <kadet1090@gmail.com>
Date: Fri, 23 Aug 2024 13:14:06 +0200
Subject: [PATCH] Gui: Use FreeCAD Theme only for FreeCAD stuff

---
 src/Gui/BitmapFactory.cpp  | 31 +++++++++++++++++++++++++++++++
 src/Gui/BitmapFactory.h    |  5 +++++
 src/Gui/StartupProcess.cpp |  7 +------
 3 files changed, 37 insertions(+), 6 deletions(-)

diff --git a/src/Gui/BitmapFactory.cpp b/src/Gui/BitmapFactory.cpp
index ddbb8fa2400b..c698f6231d75 100644
--- a/src/Gui/BitmapFactory.cpp
+++ b/src/Gui/BitmapFactory.cpp
@@ -54,6 +54,8 @@ class BitmapFactoryInstP
 public:
     QMap<std::string, const char**> xpmMap;
     QMap<std::string, QPixmap> xpmCache;
+
+    bool useIconTheme;
 };
 }
 
@@ -93,7 +95,9 @@ void BitmapFactoryInst::destruct ()
 BitmapFactoryInst::BitmapFactoryInst()
 {
     d = new BitmapFactoryInstP;
+
     restoreCustomPaths();
+    configureUseIconTheme();
 }
 
 BitmapFactoryInst::~BitmapFactoryInst()
@@ -111,6 +115,14 @@ void BitmapFactoryInst::restoreCustomPaths()
     }
 }
 
+void Gui::BitmapFactoryInst::configureUseIconTheme()
+{
+    Base::Reference<ParameterGrp> group = App::GetApplication().GetParameterGroupByPath
+        ("User parameter:BaseApp/Preferences/Bitmaps/Theme");
+
+    d->useIconTheme = group->GetBool("UseIconTheme", group->GetBool("ThemeSearchPaths", false));
+}
+
 void BitmapFactoryInst::addPath(const QString& path)
 {
     QDir::addSearchPath(QString::fromLatin1("icons"), path);
@@ -174,6 +186,10 @@ bool BitmapFactoryInst::findPixmapInCache(const char* name, QPixmap& px) const
 
 QIcon BitmapFactoryInst::iconFromTheme(const char* name, const QIcon& fallback)
 {
+    if (!d->useIconTheme) {
+        return iconFromDefaultTheme(name, fallback);
+    }
+
     QString iconName = QString::fromUtf8(name);
     QIcon icon = QIcon::fromTheme(iconName, fallback);
     if (icon.isNull()) {
@@ -206,6 +222,21 @@ bool BitmapFactoryInst::loadPixmap(const QString& filename, QPixmap& icon) const
     return !icon.isNull();
 }
 
+QIcon Gui::BitmapFactoryInst::iconFromDefaultTheme(const char* name, const QIcon& fallback)
+{
+    QIcon icon;
+    QPixmap px = pixmap(name);
+
+    if (!px.isNull()) {
+        icon.addPixmap(px);
+        return icon;
+    } else {
+        return fallback;
+    }
+
+    return icon;
+}
+
 QPixmap BitmapFactoryInst::pixmap(const char* name) const
 {
     if (!name || *name == '\0')
diff --git a/src/Gui/BitmapFactory.h b/src/Gui/BitmapFactory.h
index b17239484cf6..58cfc7372001 100644
--- a/src/Gui/BitmapFactory.h
+++ b/src/Gui/BitmapFactory.h
@@ -75,6 +75,10 @@ class GuiExport BitmapFactoryInst : public Base::Factory
      * If no such icon is found in the current theme fallback is returned instead.
      */
     QIcon iconFromTheme(const char* name, const QIcon& fallback = QIcon());
+    /** Returns the QIcon corresponding to name in the default (FreeCAD's) icon theme.
+     * If no such icon is found in the current theme fallback is returned instead.
+     */
+    QIcon iconFromDefaultTheme(const char* name, const QIcon& fallback = QIcon());
     /// Retrieves a pixmap by name
     QPixmap pixmap(const char* name) const;
     /** Retrieves a pixmap by name and size created by an
@@ -150,6 +154,7 @@ class GuiExport BitmapFactoryInst : public Base::Factory
 private:
     bool loadPixmap(const QString& path, QPixmap&) const;
     void restoreCustomPaths();
+    void configureUseIconTheme();
 
     static BitmapFactoryInst* _pcSingleton;
     BitmapFactoryInst();
diff --git a/src/Gui/StartupProcess.cpp b/src/Gui/StartupProcess.cpp
index 7b7e131410c5..65f46e9b07bd 100644
--- a/src/Gui/StartupProcess.cpp
+++ b/src/Gui/StartupProcess.cpp
@@ -178,13 +178,8 @@ void StartupProcess::setThemePaths()
         QIcon::setThemeSearchPaths(searchPaths);
     }
 
-    // KDE file dialog needs icons from the desktop theme
-    QIcon::setFallbackThemeName(QIcon::themeName());
-
     std::string name = hTheme->GetASCII("Name");
-    if (name.empty()) {
-        QIcon::setThemeName(QLatin1String("FreeCAD-default"));
-    } else {
+    if (!name.empty()) {
         QIcon::setThemeName(QString::fromLatin1(name.c_str()));
     }
 }