UI itself is usable

src/frontend/MainWindow.cpp

@@ -0,0 +1,54 @@
+#include <MainWindow.hpp>
+#include <QFileDialog>
+#include <QMessageBox>
+
+MainWindowController::MainWindowController() noexcept
+{
+  view.setupUi(this);
+  ConnectSignalsToSlots();
+}
+
+void MainWindowController::ConnectSignalsToSlots() noexcept
+{
+  connect(view.actionOpen, &QAction::triggered, this, [this]() {
+    QString file_name = QFileDialog::getOpenFileName(this);
+
+    if (!file_name.isEmpty())
+    {
+      view.actionPause->setEnabled(true);
+      view.actionReset->setEnabled(true);
+      view.actionStop->setEnabled(true);
+      emit OpenROM(file_name);
+    }
+    });
+
+  connect(view.actionExit, &QAction::triggered, this, [this]() {
+    emit Exit();
+    });
+
+  connect(view.actionReset, &QAction::triggered, this, [this]() {
+    emit Reset();
+    });
+
+  connect(view.actionStop, &QAction::triggered, this, [this]() {
+    view.actionPause->setDisabled(true);
+    view.actionReset->setDisabled(true);
+    view.actionStop->setDisabled(true);
+    emit Stop();
+    });
+
+  connect(view.actionPause, &QAction::triggered, this, [this]() {
+    textPauseToggle = !textPauseToggle;
+    view.actionPause->setText(textPauseToggle ? "Resume" : "Pause");
+    emit Pause();
+    });
+
+  connect(view.actionAbout, &QAction::triggered, this, [this]() {
+    QMessageBox::about(
+      this, tr("About Kaizen"),
+      tr("Kaizen is a Nintendo 64 emulator that strives to offer a friendly user "
+        "experience and great compatibility.\n"
+        "sliice is licensed under the BSD 3-clause license.\n"
+        "Nintendo 64 is a registered trademarks of Nintendo Co., Ltd."));
+    });
+}