Move remaining code to app module

There's still some stuff that could potentially go elsewhere but I think it's enough for now.

src/app/windowcontroller.cpp

@@ -0,0 +1,111 @@
+// SPDX-FileCopyrightText: 2022 Nicolas Fella <nicolas.fella@gmx.de>
+// SPDX-License-Identifier: GPL-2.0-or-later
+
+#include "windowcontroller.h"
+
+#include <KConfig>
+#include <KWindowConfig>
+
+#ifdef HAVE_WINDOWSYSTEM
+#if HAVE_X11
+#include <KStartupInfo>
+#endif
+#include <KWindowSystem>
+#endif
+
+#include <KSharedConfig>
+
+#include <QQuickWindow>
+#include <QStandardPaths>
+
+#ifdef HAVE_WINDOWSYSTEM
+#include <KWindowEffects>
+#endif
+
+WindowController &WindowController::instance()
+{
+    static WindowController instance;
+    return instance;
+}
+
+void WindowController::setWindow(QWindow *window)
+{
+    m_window = window;
+
+    Q_EMIT windowChanged();
+}
+
+QWindow *WindowController::window() const
+{
+    return m_window;
+}
+
+void WindowController::showAndRaiseWindow(const QString &startupId)
+{
+    if (m_window == nullptr) {
+        return;
+    }
+    if (!m_window->isVisible()) {
+        m_window->show();
+    }
+
+#ifdef HAVE_WINDOWSYSTEM
+    if (!startupId.isEmpty()) {
+        if (KWindowSystem::isPlatformX11()) {
+#if HAVE_X11
+            KStartupInfo::setNewStartupId(m_window, startupId.toUtf8());
+#endif
+        } else if (KWindowSystem::isPlatformWayland()) {
+            KWindowSystem::setCurrentXdgActivationToken(startupId);
+        }
+    }
+
+    KWindowSystem::activateWindow(m_window);
+#endif
+}
+
+bool WindowController::hasWindowSystem() const
+{
+#ifdef HAVE_WINDOWSYSTEM
+    return true;
+#else
+    return false;
+#endif
+}
+
+void WindowController::setBlur(QQuickItem *item, bool blur)
+{
+#ifdef HAVE_WINDOWSYSTEM
+    auto setWindows = [item, blur]() {
+        auto reg = QRect(QPoint(0, 0), item->window()->size());
+        KWindowEffects::enableBackgroundContrast(item->window(), blur, 1, 1, 1, reg);
+        KWindowEffects::enableBlurBehind(item->window(), blur, reg);
+    };
+
+    disconnect(item->window(), &QQuickWindow::heightChanged, this, nullptr);
+    disconnect(item->window(), &QQuickWindow::widthChanged, this, nullptr);
+    connect(item->window(), &QQuickWindow::heightChanged, this, setWindows);
+    connect(item->window(), &QQuickWindow::widthChanged, this, setWindows);
+    setWindows();
+#endif
+}
+
+void WindowController::toggleWindow()
+{
+    if (m_window == nullptr) {
+        return;
+    }
+    if (window()->isVisible()) {
+        if (window()->windowStates() & Qt::WindowMinimized) {
+            window()->showNormal();
+            window()->requestActivate();
+        } else {
+            window()->close();
+        }
+    } else {
+        showAndRaiseWindow({});
+        window()->requestActivate();
+    }
+}
+
+#include "moc_windowcontroller.cpp"