Add option to pause emulation when focus is lost

Fixes #875

src/frontend/qt_sdl/InterfaceSettingsDialog.cpp

@@ -34,6 +34,8 @@ InterfaceSettingsDialog::InterfaceSettingsDialog(QWidget* parent) : QDialog(pare
     ui->cbMouseHide->setChecked(Config::MouseHide != 0);
     ui->spinMouseHideSeconds->setEnabled(Config::MouseHide != 0);
     ui->spinMouseHideSeconds->setValue(Config::MouseHideSeconds);
+    ui->cbPauseLostFocus->setChecked(Config::PauseLostFocus != 0);
+    oldPauseLostFocusVal = ui->cbPauseLostFocus->isChecked() ? 1:0;
 }
 
 InterfaceSettingsDialog::~InterfaceSettingsDialog()
@@ -59,6 +61,7 @@ void InterfaceSettingsDialog::done(int r)
     {
         Config::MouseHide = ui->cbMouseHide->isChecked() ? 1:0;
         Config::MouseHideSeconds = ui->spinMouseHideSeconds->value();
+        Config::PauseLostFocus = ui->cbPauseLostFocus->isChecked() ? 1:0;
 
         Config::Save();
 

src/frontend/qt_sdl/InterfaceSettingsDialog.ui

@@ -6,8 +6,8 @@
    <rect>
     <x>0</x>
     <y>0</y>
-    <width>209</width>
-    <height>110</height>
+    <width>262</width>
+    <height>113</height>
    </rect>
   </property>
   <property name="sizePolicy">
@@ -20,31 +20,31 @@
    <string>Interface settings - melonDS</string>
   </property>
   <layout class="QGridLayout" name="gridLayout">
-   <item row="0" column="0" colspan="3">
-    <widget class="QCheckBox" name="cbMouseHide">
-     <property name="text">
-      <string>Hide mouse after inactivity</string>
-     </property>
-    </widget>
-   </item>
-   <item row="1" column="0">
+   <item row="1" column="0" alignment="Qt::AlignLeft">
     <widget class="QLabel" name="label">
      <property name="text">
       <string>Hide after</string>
      </property>
     </widget>
    </item>
-   <item row="1" column="1">
-    <widget class="QSpinBox" name="spinMouseHideSeconds"/>
-   </item>
-   <item row="1" column="2">
-    <widget class="QLabel" name="label_2">
+   <item row="2" column="0" colspan="4">
+    <widget class="QCheckBox" name="cbPauseLostFocus">
      <property name="text">
-      <string>seconds of inactivity</string>
+      <string>Pause emulation when window is not in focus</string>
      </property>
     </widget>
    </item>
-   <item row="2" column="0" colspan="3">
+   <item row="0" column="0" colspan="5">
+    <widget class="QCheckBox" name="cbMouseHide">
+     <property name="text">
+      <string>Hide mouse after inactivity</string>
+     </property>
+    </widget>
+   </item>
+   <item row="1" column="1" alignment="Qt::AlignLeft">
+    <widget class="QSpinBox" name="spinMouseHideSeconds"/>
+   </item>
+   <item row="3" column="0" colspan="5">
     <widget class="QDialogButtonBox" name="buttonBox">
      <property name="orientation">
       <enum>Qt::Horizontal</enum>
@@ -54,6 +54,13 @@
      </property>
     </widget>
    </item>
+   <item row="1" column="2">
+    <widget class="QLabel" name="label_2">
+     <property name="text">
+      <string>seconds of inactivity</string>
+     </property>
+    </widget>
+   </item>
   </layout>
  </widget>
  <resources/>

src/frontend/qt_sdl/PlatformConfig.cpp

@@ -80,6 +80,8 @@ int EnableCheats;
 int MouseHide;
 int MouseHideSeconds;
 
+int PauseLostFocus;
+
 bool EnableJIT;
 
 ConfigEntry PlatformConfigFile[] =
@@ -188,8 +190,9 @@ ConfigEntry PlatformConfigFile[] =
 
     {"EnableCheats", 0, &EnableCheats, 0, NULL, 0},
 
-    {"MouseHide", 0, &MouseHide, 0, NULL, 0},
+    {"MouseHide",        0, &MouseHide,        0, NULL, 0},
     {"MouseHideSeconds", 0, &MouseHideSeconds, 5, NULL, 0},
+    {"PauseLostFocus",   0, &PauseLostFocus,   0, NULL, 0},
     
     {"", -1, NULL, 0, NULL, 0}
 };

src/frontend/qt_sdl/PlatformConfig.h

@@ -94,6 +94,7 @@ extern int EnableCheats;
 
 extern int MouseHide;
 extern int MouseHideSeconds;
+extern int PauseLostFocus;
 
 }
 

src/frontend/qt_sdl/main.cpp

@@ -1534,6 +1534,19 @@ void MainWindow::dropEvent(QDropEvent* event)
     }
 }
 
+void MainWindow::onAppStateChanged(Qt::ApplicationState state)
+{
+    if (state == Qt::ApplicationInactive)
+    {
+        if (Config::PauseLostFocus && emuThread->emuIsRunning())
+            emuThread->emuPause();
+    }
+    else if (state == Qt::ApplicationActive)
+    {
+        if (Config::PauseLostFocus && !pausedManually)
+            emuThread->emuUnpause();
+    }
+}
 
 QString MainWindow::loadErrorStr(int error)
 {
@@ -2002,11 +2015,13 @@ void MainWindow::onPause(bool checked)
     {
         emuThread->emuPause();
         OSD::AddMessage(0, "Paused");
+        pausedManually = true;
     }
     else
     {
         emuThread->emuUnpause();
         OSD::AddMessage(0, "Resumed");
+        pausedManually = false;
     }
 }
 
@@ -2152,6 +2167,7 @@ void MainWindow::onOpenInterfaceSettings()
     InterfaceSettingsDialog* dlg = InterfaceSettingsDialog::openDlg(this);
     connect(dlg, &InterfaceSettingsDialog::finished, this, &MainWindow::onInterfaceSettingsFinished);
     connect(dlg, &InterfaceSettingsDialog::updateMouseTimer, this, &MainWindow::onUpdateMouseTimer);
+    connect(dlg, &InterfaceSettingsDialog::focusUnpauseEmu, emuThread, &EmuThread::emuUnpause);
 }
 
 void MainWindow::onUpdateMouseTimer()
@@ -2505,6 +2521,8 @@ int main(int argc, char** argv)
     emuThread->start();
     emuThread->emuPause();
 
+    QObject::connect(&melon, &QApplication::applicationStateChanged, mainWindow, &MainWindow::onAppStateChanged);
+
     if (argc > 1)
     {
         char* file = argv[1];

src/frontend/qt_sdl/main.h

@@ -184,6 +184,8 @@ public:
 
     bool hasOGL;
     QOpenGLContext* getOGLContext();
+    
+    void onAppStateChanged(Qt::ApplicationState state);
 
 protected:
     void resizeEvent(QResizeEvent* event) override;
@@ -262,6 +264,8 @@ private:
     void createScreenPanel();
 
     QString loadErrorStr(int error);
+    
+    bool pausedManually;
 
 public:
     QWidget* panel;