Introduce QgsGui::HigFlags and don't capitalize menu entries and dialog titles in languages other than English. Fixes #19724

Author: borysiasty

python/gui/auto_generated/qgsgui.sip.in

@@ -97,6 +97,21 @@ Sets the global window ``manager``. Ownership is transferred to the QgsGui insta
 
 .. seealso:: :py:func:`windowManager`
 
+.. versionadded:: 3.4
+%End
+
+    enum HigFlag
+    {
+      HigMenuTextIsTitleCase,
+      HigDialogTitleIsTitleCase
+    };
+    typedef QFlags<QgsGui::HigFlag> HigFlags;
+
+
+    static QgsGui::HigFlags higFlags();
+%Docstring
+Returns HIG flags. Currently indicates whether titles should be title case depending on the current locale.
+
 .. versionadded:: 3.4
 %End
 
@@ -106,6 +121,9 @@ Sets the global window ``manager``. Ownership is transferred to the QgsGui insta
     QgsGui( const QgsGui &other );
 };
 
+QFlags<QgsGui::HigFlag> operator|(QgsGui::HigFlag f1, QFlags<QgsGui::HigFlag> f2);
+
+
 /************************************************************************
  * This file has been generated automatically from                      *
  *                                                                      *

python/plugins/processing/gui/menus.py

@@ -33,6 +33,7 @@
 from processing.gui.AlgorithmDialog import AlgorithmDialog
 from qgis.utils import iface
 from qgis.core import QgsApplication, QgsMessageLog, QgsStringUtils, QgsProcessingAlgorithm
+from qgis.gui import QgsGui
 from processing.gui.MessageBarProgress import MessageBarProgress
 from processing.gui.AlgorithmExecutor import execute
 from processing.gui.Postprocessing import handleAlgorithmResults
@@ -183,10 +184,10 @@ def removeMenus():
 
 def addAlgorithmEntry(alg, menuName, submenuName, actionText=None, icon=None, addButton=False):
     if actionText is None:
-        if alg.flags() & QgsProcessingAlgorithm.FlagDisplayNameIsLiteral:
-            alg_title = alg.displayName()
-        else:
+        if (QgsGui.higFlags() & QgsGui.HigMenuTextIsTitleCase) and not (alg.flags() & QgsProcessingAlgorithm.FlagDisplayNameIsLiteral):
             alg_title = QgsStringUtils.capitalize(alg.displayName(), QgsStringUtils.TitleCase)
+        else:
+            alg_title = alg.displayName()
         actionText = alg_title + QCoreApplication.translate('Processing', '…')
     action = QAction(icon or alg.icon(), actionText, iface.mainWindow())
     alg_id = alg.id()

src/gui/processing/qgsprocessingalgorithmdialogbase.cpp

@@ -123,10 +123,14 @@ void QgsProcessingAlgorithmDialogBase::setAlgorithm( QgsProcessingAlgorithm *alg
 {
   mAlgorithm = algorithm;
   QString title;
-  if ( algorithm->flags() & QgsProcessingAlgorithm::FlagDisplayNameIsLiteral )
-    title = mAlgorithm->displayName();
-  else
+  if ( ( QgsGui::higFlags() & QgsGui::HigDialogTitleIsTitleCase ) and !( algorithm->flags() & QgsProcessingAlgorithm::FlagDisplayNameIsLiteral ) )
+  {
     title = QgsStringUtils::capitalize( mAlgorithm->displayName(), QgsStringUtils::TitleCase );
+  }
+  else
+  {
+    title = mAlgorithm->displayName();
+  }
   setWindowTitle( title );
 
   QString algHelp = formatHelp( algorithm );

src/gui/qgsgui.cpp

@@ -42,6 +42,7 @@
 #include "qgslogger.h"
 #include "qgsprocessingrecentalgorithmlog.h"
 #include "qgswindowmanagerinterface.h"
+#include "qgssettings.h"
 
 QgsGui *QgsGui::instance()
 {
@@ -113,6 +114,19 @@ void QgsGui::setWindowManager( QgsWindowManagerInterface *manager )
   instance()->mWindowManager.reset( manager );
 }
 
+QgsGui::HigFlags QgsGui::higFlags()
+{
+  QgsSettings settings;
+  if ( settings.value( QStringLiteral( "locale/userLocale" ), "" ).toString().startsWith( "en" ) )
+  {
+    return HigMenuTextIsTitleCase | HigDialogTitleIsTitleCase;
+  }
+  else
+  {
+    return NULL;
+  }
+}
+
 QgsGui::~QgsGui()
 {
   delete mProcessingGuiRegistry;

src/gui/qgsgui.h

@@ -125,6 +125,23 @@ class GUI_EXPORT QgsGui
      */
     static void setWindowManager( QgsWindowManagerInterface *manager SIP_TRANSFER );
 
+    /**
+    * HIG flags. Currently indicate whether titles should be title case depending on the current locale.
+    * \since QGIS 3.4
+    */
+    enum HigFlag
+    {
+      HigMenuTextIsTitleCase = 1 << 0,       //!< Menu action texts should be title case
+      HigDialogTitleIsTitleCase = 1 << 1     //!< Dialog titles should be title case
+    };
+    Q_DECLARE_FLAGS( HigFlags, HigFlag )
+
+    /**
+    * Returns HIG flags. Currently indicates whether titles should be title case depending on the current locale.
+    * \since QGIS 3.4
+    */
+    static QgsGui::HigFlags higFlags();
+
     ~QgsGui();
 
   private:
@@ -149,4 +166,6 @@ class GUI_EXPORT QgsGui
 
 };
 
+Q_DECLARE_OPERATORS_FOR_FLAGS( QgsGui::HigFlags )
+
 #endif // QGSGUI_H