UI: Add preview/program labels in studio mode

UI/data/locale/en-US.ini

@@ -604,6 +604,7 @@ Basic.Settings.General.OverflowAlwaysVisible="Overflow always visible"
 Basic.Settings.General.OverflowSelectionHidden="Show overflow even when source is invisible"
 Basic.Settings.General.SwitchOnDoubleClick="Transition to scene when double-clicked"
 Basic.Settings.General.StudioPortraitLayout="Enable portrait/vertical layout"
+Basic.Settings.General.TogglePreviewProgramLabels="Show preview/program labels"
 Basic.Settings.General.Multiview="Multiview"
 Basic.Settings.General.Multiview.MouseSwitch="Click to switch between scenes"
 Basic.Settings.General.Multiview.DrawSourceNames="Show scene names"

UI/data/themes/Acri.qss

@@ -907,3 +907,11 @@ FocusList::item {
 * [themeID="displayBackgroundColor"] {
     qproperty-displayBackgroundColor: #28282A;
 }
+
+/* Preview/Program labels */
+
+* [themeID="previewProgramLabels"] {
+	font-size: 18px;
+	font-weight: bold;
+	color: rgb(122,121,122);
+}

UI/data/themes/Dark.qss

@@ -698,3 +698,11 @@ QLabel#errorLabel {
 * [themeID="displayBackgroundColor"] {
     qproperty-displayBackgroundColor: rgb(76, 76, 76);
 }
+
+/* Preview/Program labels */
+
+* [themeID="previewProgramLabels"] {
+    font-size: 18px;
+    font-weight: bold;
+    color: rgb(122,121,122);
+}

UI/data/themes/Default.qss

@@ -141,3 +141,11 @@ QLabel#errorLabel {
 * [themeID="displayBackgroundColor"] {
     qproperty-displayBackgroundColor: rgb(76, 76, 76);
 }
+
+/* Preview/Program labels */
+
+* [themeID="previewProgramLabels"] {
+    font-size: 18px;
+    font-weight: bold;
+    color: rgb(122,121,122);
+}

UI/data/themes/Rachni.qss

@@ -1263,3 +1263,11 @@ QToolTip {
 * [themeID="displayBackgroundColor"] {
     qproperty-displayBackgroundColor: rgb(35, 38, 41);
 }
+
+/* Preview/Program labels */
+
+* [themeID="previewProgramLabels"] {
+	font-size: 18px;
+	font-weight: bold;
+	color: rgb(122,121,122);
+}

UI/forms/OBSBasic.ui

@@ -69,6 +69,13 @@
           <property name="spacing">
            <number>4</number>
           </property>
+          <item>
+           <widget class="QLabel" name="previewLabel">
+            <property name="text">
+             <string>StudioMode.Preview</string>
+            </property>
+           </widget>
+          </item>
           <item>
            <widget class="OBSBasicPreview" name="preview" native="true">
             <property name="sizePolicy">
@@ -106,7 +113,7 @@
      <x>0</x>
      <y>0</y>
      <width>1079</width>
-     <height>21</height>
+     <height>25</height>
     </rect>
    </property>
    <widget class="QMenu" name="menu_File">
@@ -644,7 +651,7 @@
           <rect>
            <x>0</x>
            <y>0</y>
-           <width>230</width>
+           <width>82</width>
            <height>16</height>
           </rect>
          </property>
@@ -698,7 +705,7 @@
            <x>0</x>
            <y>0</y>
            <width>16</width>
-           <height>230</height>
+           <height>26</height>
           </rect>
          </property>
          <property name="sizePolicy">

UI/forms/OBSBasicSettings.ui

@@ -144,9 +144,9 @@
             <property name="geometry">
              <rect>
               <x>0</x>
-              <y>0</y>
-              <width>801</width>
-              <height>931</height>
+              <y>-540</y>
+              <width>804</width>
+              <height>1264</height>
              </rect>
             </property>
             <layout class="QVBoxLayout" name="verticalLayout_19">
@@ -634,6 +634,16 @@
                      </property>
                     </widget>
                    </item>
+                   <item row="2" column="1">
+                    <widget class="QCheckBox" name="prevProgLabelToggle">
+                     <property name="text">
+                      <string>Basic.Settings.General.TogglePreviewProgramLabels</string>
+                     </property>
+                     <property name="checked">
+                      <bool>true</bool>
+                     </property>
+                    </widget>
+                   </item>
                   </layout>
                  </widget>
                 </item>
@@ -1144,8 +1154,8 @@
              <rect>
               <x>0</x>
               <y>0</y>
-              <width>601</width>
-              <height>640</height>
+              <width>890</width>
+              <height>791</height>
              </rect>
             </property>
             <layout class="QVBoxLayout" name="verticalLayout_21">
@@ -3845,8 +3855,8 @@
              <rect>
               <x>0</x>
               <y>0</y>
-              <width>63</width>
-              <height>16</height>
+              <width>98</width>
+              <height>28</height>
              </rect>
             </property>
            </widget>
@@ -4259,8 +4269,8 @@
              <rect>
               <x>0</x>
               <y>0</y>
-              <width>594</width>
-              <height>833</height>
+              <width>867</width>
+              <height>1061</height>
              </rect>
             </property>
             <layout class="QVBoxLayout" name="verticalLayout_23">

UI/obs-app.cpp

@@ -418,6 +418,8 @@ bool OBSApp::InitGlobalConfigDefaults()
 			"ShowListboxToolbars", true);
 	config_set_default_bool(globalConfig, "BasicWindow",
 			"ShowStatusBar", true);
+	config_set_default_bool(globalConfig, "BasicWindow",
+			"StudioModeLabels", true);
 
 	if (!config_get_bool(globalConfig, "General", "Pre21Defaults")) {
 		config_set_default_string(globalConfig, "General",

UI/window-basic-main-transitions.cpp

@@ -696,6 +696,7 @@ void OBSBasic::SetCurrentScene(OBSSource scene, bool force, bool direct)
 void OBSBasic::CreateProgramDisplay()
 {
 	program = new OBSQTDisplay();
+
 	program->setContextMenuPolicy(Qt::CustomContextMenu);
 	connect(program.data(), &QWidget::customContextMenuRequested,
 			this, &OBSBasic::on_program_customContextMenuRequested);
@@ -1192,6 +1193,8 @@ void OBSBasic::SetPreviewProgramMode(bool enabled)
 	if (IsPreviewProgramMode() == enabled)
 		return;
 
+	ui->previewLabel->setHidden(!enabled);
+
 	ui->modeSwitch->setChecked(enabled);
 	os_atomic_set_bool(&previewProgramMode, enabled);
 
@@ -1230,10 +1233,28 @@ void OBSBasic::SetPreviewProgramMode(bool enabled)
 
 		RefreshQuickTransitions();
 
+		programLabel = new QLabel(QTStr("StudioMode.Program"));
+		programLabel->setAlignment(Qt::AlignHCenter | Qt::AlignVCenter);
+		programLabel->setProperty("themeID", "previewProgramLabels");
+
+		programWidget = new QWidget();
+		programLayout = new QVBoxLayout();
+
+		programLayout->setContentsMargins(0, 0, 0, 0);
+
+		programLayout->addWidget(programLabel);
+		programLayout->addWidget(program);
+
+		bool labels = config_get_bool(GetGlobalConfig(),
+			"BasicWindow", "StudioModeLabels");
+
+		programLabel->setHidden(!labels);
+
+		programWidget->setLayout(programLayout);
+
 		ui->previewLayout->addWidget(programOptions);
-		ui->previewLayout->addWidget(program);
+		ui->previewLayout->addWidget(programWidget);
 		ui->previewLayout->setAlignment(programOptions, Qt::AlignCenter);
-		program->show();
 
 		if (api)
 			api->on_event(OBS_FRONTEND_EVENT_STUDIO_MODE_ENABLED);
@@ -1251,6 +1272,8 @@ void OBSBasic::SetPreviewProgramMode(bool enabled)
 
 		delete programOptions;
 		delete program;
+		delete programLabel;
+		delete programWidget;
 
 		if (lastScene) {
 			OBSSource actualLastScene = OBSGetStrongRef(lastScene);

UI/window-basic-main.cpp

@@ -371,6 +371,17 @@ OBSBasic::OBSBasic(QWidget *parent)
 	QPoint statsDockPos = curSize / 2 - statsDockSize / 2;
 	QPoint newPos = curPos + statsDockPos;
 	statsDock->move(newPos);
+
+	ui->previewLabel->setAlignment(Qt::AlignHCenter | Qt::AlignVCenter);
+	ui->previewLabel->setProperty("themeID", "previewProgramLabels");
+
+	bool labels = config_get_bool(GetGlobalConfig(),
+			"BasicWindow", "StudioModeLabels");
+
+	if (!previewProgramMode)
+		ui->previewLabel->setHidden(true);
+	else
+		ui->previewLabel->setHidden(!labels);
 }
 
 static void SaveAudioDevice(const char *name, int channel, obs_data_t *parent,
@@ -3437,10 +3448,19 @@ void OBSBasic::ResetUI()
 	bool studioPortraitLayout = config_get_bool(GetGlobalConfig(),
 			"BasicWindow", "StudioPortraitLayout");
 
+	bool labels = config_get_bool(GetGlobalConfig(),
+			"BasicWindow", "StudioModeLabels");
+
 	if (studioPortraitLayout)
 		ui->previewLayout->setDirection(QBoxLayout::TopToBottom);
 	else
 		ui->previewLayout->setDirection(QBoxLayout::LeftToRight);
+
+	if (previewProgramMode)
+		ui->previewLabel->setHidden(!labels);
+
+	if (programLabel)
+		programLabel->setHidden(!labels);
 }
 
 int OBSBasic::ResetVideo()

UI/window-basic-main.hpp

@@ -229,6 +229,10 @@ private:
 	QPointer<QMenu>           perSceneTransitionMenu;
 	QPointer<QObject>         shortcutFilter;
 
+	QPointer<QWidget> programWidget;
+	QPointer<QVBoxLayout> programLayout;
+	QPointer<QLabel> programLabel;
+
 	void          UpdateMultiviewProjectorMenu();
 
 	void          DrawBackdrop(float cx, float cy);

UI/window-basic-settings.cpp

@@ -325,6 +325,7 @@ OBSBasicSettings::OBSBasicSettings(QWidget *parent)
 	HookWidget(ui->overflowSelectionHide,CHECK_CHANGED,  GENERAL_CHANGED);
 	HookWidget(ui->doubleClickSwitch,    CHECK_CHANGED,  GENERAL_CHANGED);
 	HookWidget(ui->studioPortraitLayout, CHECK_CHANGED,  GENERAL_CHANGED);
+	HookWidget(ui->prevProgLabelToggle,  CHECK_CHANGED,  GENERAL_CHANGED);
 	HookWidget(ui->multiviewMouseSwitch, CHECK_CHANGED,  GENERAL_CHANGED);
 	HookWidget(ui->multiviewDrawNames,   CHECK_CHANGED,  GENERAL_CHANGED);
 	HookWidget(ui->multiviewDrawAreas,   CHECK_CHANGED,  GENERAL_CHANGED);
@@ -1120,6 +1121,10 @@ void OBSBasicSettings::LoadGeneralSettings()
 			"BasicWindow", "StudioPortraitLayout");
 	ui->studioPortraitLayout->setChecked(studioPortraitLayout);
 
+	bool prevProgLabels = config_get_bool(GetGlobalConfig(),
+			"BasicWindow", "StudioModeLabels");
+	ui->prevProgLabelToggle->setChecked(prevProgLabels);
+
 	bool multiviewMouseSwitch = config_get_bool(GetGlobalConfig(),
 			"BasicWindow", "MultiviewMouseSwitch");
 	ui->multiviewMouseSwitch->setChecked(multiviewMouseSwitch);
@@ -2767,6 +2772,14 @@ void OBSBasicSettings::SaveGeneralSettings()
 		main->ResetUI();
 	}
 
+	if (WidgetChanged(ui->prevProgLabelToggle)) {
+		config_set_bool(GetGlobalConfig(), "BasicWindow",
+				"StudioModeLabels",
+				ui->prevProgLabelToggle->isChecked());
+
+		main->ResetUI();
+	}
+
 	bool multiviewChanged = false;
 	if (WidgetChanged(ui->multiviewMouseSwitch)) {
 		config_set_bool(GetGlobalConfig(), "BasicWindow",