feat(AppColorSchemeChooser): User is able to change konsole color scheme

Add AppColorSchemeChooser class which use KColorSchemeManager to change
konsole color scheme. Inspired by KateColorSchemeChooser wrote by
Zhigalin Alexander <alexander@zhigalin.tk>.

desktop/konsoleui.rc

 <?xml version="1.0"?>
 <!DOCTYPE gui SYSTEM "kpartgui.dtd">
 
-<gui name="konsole" version="18">
+<gui name="konsole" version="19">
     <MenuBar>
         <Menu name="file"><text>File</text>
             <Action name="new-window"/>
@@ -39,6 +39,7 @@
             <DefineGroup name="session-settings"/>
             <Action name="manage-profiles"/>
             <Action name="show-menubar"/>
+            <Action name="colorscheme-menu"/>
             <Separator/>
             <Action name="view-full-screen"/>
             <Separator/>

src/AppColorSchemeChooser.cpp

+/*************************************************************************************
+ * SPDX-FileCopyrightText: 2016 Zhigalin Alexander <alexander@zhigalin.tk>
+ * SPDX-FileCopyrightText: 2021 DI DIO Maximilien <maximilien.didio@gmail.com>
+ *
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
+ *************************************************************************************/
+
+#include "AppColorSchemeChooser.h"
+#include "konsoledebug.h"
+
+#include <QActionGroup>
+#include <QDirIterator>
+#include <QFileInfo>
+#include <QMenu>
+#include <QModelIndex>
+#include <QStandardPaths>
+#include <QStringList>
+#include <QtGlobal>
+
+#include <KActionCollection>
+#include <KActionMenu>
+#include <KConfigGroup>
+#include <KLocalizedString>
+#include <KSharedConfig>
+
+#include "MainWindow.h"
+
+AppColorSchemeChooser::AppColorSchemeChooser(QObject *parent)
+    : QAction(parent)
+{
+    auto manager = new KColorSchemeManager(parent);
+
+    const auto scheme(currentSchemeName());
+    qCDebug(KonsoleDebug) << "Color scheme : " << scheme;
+
+    auto selectionMenu = manager->createSchemeSelectionMenu(scheme, this);
+
+    connect(selectionMenu->menu(), &QMenu::triggered, this, &AppColorSchemeChooser::slotSchemeChanged);
+
+    manager->activateScheme(manager->indexForScheme(scheme));
+
+    setMenu(selectionMenu->menu());
+    menu()->setIcon(QIcon::fromTheme(QStringLiteral("preferences-desktop-color")));
+    menu()->setTitle(i18n("&Color Scheme"));
+}
+
+QString AppColorSchemeChooser::loadCurrentScheme() const
+{
+    KSharedConfigPtr config = KSharedConfig::openConfig();
+    KConfigGroup cg(config, "UiSettings");
+    return cg.readEntry("ColorScheme", QString());
+}
+
+void AppColorSchemeChooser::saveCurrentScheme(const QString &name)
+{
+    KSharedConfigPtr config = KSharedConfig::openConfig();
+    KConfigGroup cg(config, "UiSettings");
+    cg.writeEntry("ColorScheme", name);
+    cg.sync();
+}
+
+QString AppColorSchemeChooser::currentSchemeName() const
+{
+    if (!menu()) {
+        return loadCurrentScheme();
+    }
+
+    QAction *const action = menu()->activeAction();
+
+    if (action) {
+        return KLocalizedString::removeAcceleratorMarker(action->text());
+    }
+    return QString();
+}
+
+void AppColorSchemeChooser::slotSchemeChanged(QAction *triggeredAction)
+{
+    saveCurrentScheme(KLocalizedString::removeAcceleratorMarker(triggeredAction->text()));
+}

src/AppColorSchemeChooser.h

+/*************************************************************************************
+ * SPDX-FileCopyrightText: 2016 Zhigalin Alexander <alexander@zhigalin.tk>
+ * SPDX-FileCopyrightText: 2021 DI DIO Maximilien <maximilien.didio@gmail.com>
+ *
+ * SPDX-License-Identifier: LGPL-2.1-only OR LGPL-3.0-only OR LicenseRef-KDE-Accepted-LGPL
+ *************************************************************************************/
+
+#ifndef KONSOLE_COLOR_SCHEME_CHOOSER_H
+#define KONSOLE_COLOR_SCHEME_CHOOSER_H
+
+#include <QAction>
+#include <QApplication>
+#include <QObject>
+#include <QString>
+
+#include <KColorSchemeManager>
+
+// Konsole
+#include "konsoleprivate_export.h"
+
+class KActionCollection;
+
+/**
+ * Provides a menu that will offer to change the color scheme
+ *
+ * Furthermore, it will save the selection in the user configuration.
+ */
+class KONSOLEPRIVATE_EXPORT AppColorSchemeChooser : public QAction
+{
+public:
+    AppColorSchemeChooser(QObject *parent);
+
+    QString currentSchemeName() const;
+private Q_SLOTS:
+    void slotSchemeChanged(QAction *triggeredAction);
+
+private:
+    QString loadCurrentScheme() const;
+    void saveCurrentScheme(const QString &name);
+};
+
+#endif

src/CMakeLists.txt

@@ -109,6 +109,7 @@ add_subdirectory(decoders)
 add_subdirectory(plugins)
 
 set(konsoleprivate_SRCS ${windowadaptors_SRCS}
+                        AppColorSchemeChooser.cpp
                         BookmarkHandler.cpp
                         BookmarkMenu.cpp
                         CheckableSessionModel.cpp

src/MainWindow.cpp

@@ -6,6 +6,7 @@
 
 // Own
 #include "MainWindow.h"
+#include "AppColorSchemeChooser.h"
 
 // Qt
 #include <QMenu>
@@ -336,6 +337,8 @@ void MainWindow::setupActions()
     // Settings Menu
     _toggleMenuBarAction = KStandardAction::showMenubar(menuBar(), &QMenuBar::setVisible, collection);
     collection->setDefaultShortcut(_toggleMenuBarAction, Konsole::ACCEL | Qt::SHIFT | Qt::Key_M);
+    // Set up themes
+    actionCollection()->addAction(QStringLiteral("colorscheme-menu"), new AppColorSchemeChooser(actionCollection()));
 
     // Full Screen
     menuAction = KStandardAction::fullScreen(this, &MainWindow::viewFullScreen, this, collection);