Add menu and logic to save and load recently loaded files.

This menu is only for ROM and will not save symbols recently loaded.
When the menu is empty, the menu is disabled (greyed out)

src/citra_qt/main.cpp

@@ -7,6 +7,7 @@
 #include <QtGui>
 #include <QDesktopWidget>
 #include <QFileDialog>
+#include <QMessageBox>
 #include "qhexedit.h"
 #include "main.h"
 
@@ -137,6 +138,16 @@ GMainWindow::GMainWindow() : emu_thread(nullptr)
     ui.actionDisplay_widget_title_bars->setChecked(settings.value("displayTitleBars", true).toBool());
     OnDisplayTitleBars(ui.actionDisplay_widget_title_bars->isChecked());
 
+    // Prepare actions for recent files
+    for (int i = 0; i < max_recent_files_item; ++i) {
+        actions_recent_files[i] = new QAction(this);
+        actions_recent_files[i]->setVisible(false);
+        connect(actions_recent_files[i], SIGNAL(triggered()), this, SLOT(OnMenuRecentFile()));
+
+        ui.menu_recent_files->addAction(actions_recent_files[i]);
+    }
+    UpdateRecentFiles();
+
     // Setup connections
     connect(ui.action_Load_File, SIGNAL(triggered()), this, SLOT(OnMenuLoadFile()));
     connect(ui.action_Load_Symbol_Map, SIGNAL(triggered()), this, SLOT(OnMenuLoadSymbolMap()));
@@ -209,6 +220,10 @@ void GMainWindow::OnDisplayTitleBars(bool show)
 void GMainWindow::BootGame(const std::string& filename) {
     LOG_INFO(Frontend, "Citra starting...\n");
 
+    // Shutdown previous session if the emu thread is still active...
+    if (emu_thread != nullptr)
+        ShutdownGame();
+
     // Initialize the core emulation
     System::Init(render_window);
 
@@ -268,18 +283,43 @@ void GMainWindow::ShutdownGame() {
     render_window->hide();
 }
 
-void GMainWindow::OnMenuLoadFile()
-{
+void GMainWindow::UpdateRecentFiles() {
+    QSettings settings;
+    QStringList recent_files = settings.value("recentFiles").toStringList();
+
+    unsigned int num_recent_files = std::min(recent_files.size(), static_cast<int>(max_recent_files_item));
+
+    for (unsigned int i = 0; i < num_recent_files; i++) {
+        QString text = QString("&%1. %2").arg(i + 1).arg(QFileInfo(recent_files[i]).fileName());
+        actions_recent_files[i]->setText(text);
+        actions_recent_files[i]->setData(recent_files[i]);
+        actions_recent_files[i]->setVisible(true);
+    }
+
+    for (int j = num_recent_files; j < max_recent_files_item; ++j) {
+        actions_recent_files[j]->setVisible(false);
+    }
+
+    // Grey out the recent files menu if the list is empty
+    if (num_recent_files == 0) {
+        ui.menu_recent_files->setEnabled(false);
+    } else {
+        ui.menu_recent_files->setEnabled(true);
+    }
+}
+
+void GMainWindow::OnMenuLoadFile() {
     QSettings settings;
     QString rom_path = settings.value("romsPath", QString()).toString();
 
     QString filename = QFileDialog::getOpenFileName(this, tr("Load File"), rom_path, tr("3DS executable (*.3ds *.3dsx *.elf *.axf *.cci *.cxi)"));
     if (filename.size()) {
         settings.setValue("romsPath", QFileInfo(filename).path());
-
-        // Shutdown previous session if the emu thread is still active...
-        if (emu_thread != nullptr)
-            ShutdownGame();
+        // Update recent files list
+        QStringList recent_files = settings.value("recentFiles").toStringList();
+        recent_files.prepend(filename);
+        settings.setValue("recentFiles", recent_files);
+        UpdateRecentFiles(); // Update UI
 
         BootGame(filename.toLatin1().data());
     }
@@ -297,8 +337,32 @@ void GMainWindow::OnMenuLoadSymbolMap() {
     }
 }
 
-void GMainWindow::OnStartGame()
-{
+void GMainWindow::OnMenuRecentFile() {
+    QAction* action = qobject_cast<QAction*>(sender());
+    assert(action);
+
+    QString filename = action->data().toString();
+    QFileInfo file_info(filename);
+    if (file_info.exists()) {
+        BootGame(filename.toLatin1().data());
+    } else {
+        // Display an error message and remove the file from the list.
+        QMessageBox::information(this, tr("File not found"), tr("File \"%1\" not found").arg(filename));
+
+        QSettings settings;
+        QStringList recent_files = settings.value("recentFiles").toStringList();
+        recent_files.removeOne(filename);
+        settings.setValue("recentFiles", recent_files);
+
+        action->setVisible(false);
+        // Grey out the recent files menu if the list is empty
+        if (ui.menu_recent_files->isEmpty()) {
+            ui.menu_recent_files->setEnabled(false);
+        }
+    }
+}
+
+void GMainWindow::OnStartGame() {
     emu_thread->SetRunning(true);
 
     ui.action_Start->setEnabled(false);
@@ -308,8 +372,7 @@ void GMainWindow::OnStartGame()
     ui.action_Stop->setEnabled(true);
 }
 
-void GMainWindow::OnPauseGame()
-{
+void GMainWindow::OnPauseGame() {
     emu_thread->SetRunning(false);
 
     ui.action_Start->setEnabled(true);
@@ -321,8 +384,7 @@ void GMainWindow::OnStopGame() {
     ShutdownGame();
 }
 
-void GMainWindow::OnOpenHotkeysDialog()
-{
+void GMainWindow::OnOpenHotkeysDialog() {
     GHotkeysDialog dialog(this);
     dialog.exec();
 }
@@ -350,13 +412,11 @@ void GMainWindow::ToggleWindowMode() {
     }
 }
 
-void GMainWindow::OnConfigure()
-{
+void GMainWindow::OnConfigure() {
     //GControllerConfigDialog* dialog = new GControllerConfigDialog(controller_ports, this);
 }
 
-void GMainWindow::closeEvent(QCloseEvent* event)
-{
+void GMainWindow::closeEvent(QCloseEvent* event) {
     // Save window layout
     QSettings settings(QSettings::IniFormat, QSettings::UserScope, "Citra team", "Citra");
     settings.setValue("geometry", saveGeometry());
@@ -380,8 +440,7 @@ void GMainWindow::closeEvent(QCloseEvent* event)
 #undef main
 #endif
 
-int main(int argc, char* argv[])
-{
+int main(int argc, char* argv[]) {
     Log::Filter log_filter(Log::Level::Info);
     Log::SetFilter(&log_filter);