Add app-wide color scheme chooser

BUG: 432088
FIXED-IN: 22.08

part/part.cpp

@@ -48,7 +48,9 @@
 #include "kconfigwidgets_version.h" // TODO KF 5.81 Remove this include, because the relevant section below will also be removed.
 #include <KAboutPluginDialog>
 #include <KActionCollection>
+#include <KActionMenu>
 #include <KBookmarkAction>
+#include <KColorSchemeManager>
 #include <KDirWatch>
 #include <KFilterBase>
 #include <KFilterDev>
@@ -72,6 +74,7 @@
 #ifdef WITH_KWALLET
 #include <KWallet>
 #endif
+#include "kconfigwidgets_version.h"
 #include "kxmlgui_version.h" // TODO KF 5.79 Remove this include, because the relevant section below will also be removed.
 #include <KXMLGUIClient>
 #include <KXMLGUIFactory>
@@ -869,6 +872,12 @@ void Part::setupActions()
 {
     KActionCollection *ac = actionCollection();
 
+#if KCONFIGWIDGETS_VERSION >= QT_VERSION_CHECK(5, 89, 0)
+    auto manager = new KColorSchemeManager(this);
+    KActionMenu *schemeMenu = manager->createSchemeSelectionMenu(this);
+    ac->addAction(QStringLiteral("colorscheme_menu"), schemeMenu->menu()->menuAction());
+#endif
+
     m_copy = KStandardAction::create(KStandardAction::Copy, m_pageView, SLOT(copyTextSelection()), ac);
 
     m_selectAll = KStandardAction::selectAll(m_pageView, SLOT(selectAll()), ac);

part/part.rc

@@ -1,6 +1,6 @@
 <?xml version="1.0"?>
 <!DOCTYPE gui SYSTEM "kpartgui.dtd">
-<gui name="okular_part" version="51">
+<gui name="okular_part" version="52">
 <MenuBar>
   <Menu name="file"><text>&amp;File</text>
     <Action name="get_new_stuff" group="file_open"/>
@@ -88,6 +88,7 @@
     <Action name="speak_pause_resume"/>
   </Menu>
   <Menu name="settings"><text>&amp;Settings</text>
+    <Action name="colorscheme_menu" group="show_merge"/>
     <Action name="show_leftpanel" group="show_merge"/>
     <Action name="show_bottombar" group="show_merge"/>
     <Action name="options_configure_generators" group="configure_merge"/>