qt: Send dialog status to VM-manager & fix pause

- Manager is notified of modal dialogs blocking the main window.
- Pause command from manager uses action to prevent desyncing pause status
in the menus and toolbar.

src/qt/qt_main.cpp

@@ -144,15 +144,23 @@ int main(int argc, char* argv[]) {
     std::unique_ptr<WindowsManagerFilter> wmfilter;
     if (source_hwnd)
     {
+        HWND main_hwnd = (HWND)main_window->winId();
+
         wmfilter.reset(new WindowsManagerFilter());
         QObject::connect(wmfilter.get(), WindowsManagerFilter::showsettings, main_window, MainWindow::showSettings);
-        QObject::connect(wmfilter.get(), WindowsManagerFilter::pause, [](){ plat_pause(dopause ^ 1); });
+        QObject::connect(wmfilter.get(), WindowsManagerFilter::pause, main_window, MainWindow::togglePause);
         QObject::connect(wmfilter.get(), WindowsManagerFilter::reset, main_window, MainWindow::hardReset);
         QObject::connect(wmfilter.get(), WindowsManagerFilter::shutdown, [](){ plat_power_off(); });
         QObject::connect(wmfilter.get(), WindowsManagerFilter::ctrlaltdel, [](){ pc_send_cad(); });
+        QObject::connect(wmfilter.get(), WindowsManagerFilter::dialogstatus, [main_hwnd](bool open){
+            PostMessage((HWND)(uintptr_t)source_hwnd, WM_SENDDLGSTATUS, (WPARAM)(open ? 1 : 0), (LPARAM)main_hwnd);
+        });
+
+        /* Native filter to catch VM-managers commands */
         app.installNativeEventFilter(wmfilter.get());
 
-        HWND main_hwnd = (HWND)main_window->winId();
+        /* Filter to catch main window being blocked (by modal dialog) */
+        main_window->installEventFilter(wmfilter.get());
 
         /* Send main window HWND to manager */
         PostMessage((HWND)(uintptr_t)source_hwnd, WM_SENDHWND, (WPARAM)unique_id, (LPARAM)main_hwnd);

src/qt/qt_mainwindow.cpp

@@ -1501,3 +1501,8 @@ void MainWindow::hardReset()
 {
     ui->actionHard_Reset->trigger();
 }
+
+void MainWindow::togglePause()
+{
+    ui->actionPause->trigger();
+}

src/qt/qt_mainwindow.hpp

@@ -50,6 +50,7 @@ signals:
 public slots:
     void showSettings();
     void hardReset();
+    void togglePause();
 private slots:
     void on_actionFullscreen_triggered();
     void on_actionSettings_triggered();

src/qt/qt_winmanagerfilter.cpp

@@ -30,6 +30,7 @@
 
 #include "qt_winmanagerfilter.hpp"
 
+#include <Windows.h>
 #include <86box/win.h>
 
 bool WindowsManagerFilter::nativeEventFilter(const QByteArray &eventType, void *message, long *result)
@@ -60,3 +61,17 @@ bool WindowsManagerFilter::nativeEventFilter(const QByteArray &eventType, void *
 
     return false;
 }
+
+bool WindowsManagerFilter::eventFilter(QObject *obj, QEvent *event)
+{
+    if (event->type() == QEvent::WindowBlocked)
+    {
+        emit dialogstatus(1);
+    }
+    else if (event->type() == QEvent::WindowUnblocked)
+    {
+        emit dialogstatus(0);
+    }
+
+    return QObject::eventFilter(obj, event);
+}

src/qt/qt_winmanagerfilter.hpp

@@ -33,6 +33,8 @@
 
 #include <QObject>
 #include <QAbstractNativeEventFilter>
+#include <QByteArray>
+#include <QEvent>
 
 #if QT_VERSION_MAJOR >= 6
 #define result_t qintptr
@@ -40,6 +42,10 @@
 #define result_t long
 #endif
 
+/*
+ * Filters native events for messages from VM-manager and
+ * window blocked events to notify about open modal dialogs.
+ */
 class WindowsManagerFilter : public QObject, public QAbstractNativeEventFilter
 {
     Q_OBJECT
@@ -53,6 +59,10 @@ signals:
     void showsettings();
     void reset();
     void shutdown();
+    void dialogstatus(bool open);
+
+protected:
+    bool eventFilter(QObject *obj, QEvent *event) override;
 };
 
 #endif