UI: Add hotkey to toggle preview

UI/data/locale/en-US.ini

@@ -342,6 +342,9 @@ Basic.DisplayCapture="Display Capture"
 # display context menu
 Basic.Main.PreviewConextMenu.Enable="Enable Preview"
 
+# disable preview
+Basic.Main.Preview.Disable="Disable Preview"
+
 # scale filtering
 ScaleFiltering="Scale Filtering"
 ScaleFiltering.Point="Point"

UI/window-basic-main.cpp

@@ -2182,6 +2182,19 @@ void OBSBasic::CreateHotkeys()
 			this, this);
 	LoadHotkeyPair(replayBufHotkeys,
 			"OBSBasic.StartReplayBuffer", "OBSBasic.StopReplayBuffer");
+
+	togglePreviewHotkeys = obs_hotkey_pair_register_frontend(
+			"OBSBasic.EnablePreview",
+			Str("Basic.Main.PreviewConextMenu.Enable"),
+			"OBSBasic.DisablePreview",
+			Str("Basic.Main.Preview.Disable"),
+			MAKE_CALLBACK(!basic.previewEnabled,
+				basic.EnablePreview, "Enabling preview"),
+			MAKE_CALLBACK(basic.previewEnabled,
+				basic.DisablePreview, "Disabling preview"),
+			this, this);
+	LoadHotkeyPair(togglePreviewHotkeys,
+			"OBSBasic.EnablePreview", "OBSBasic.DisablePreview");
 #undef MAKE_CALLBACK
 
 	auto togglePreviewProgram = [] (void *data, obs_hotkey_id,
@@ -6192,6 +6205,24 @@ void OBSBasic::TogglePreview()
 	EnablePreviewDisplay(previewEnabled);
 }
 
+void OBSBasic::EnablePreview()
+{
+	if (previewProgramMode)
+		return;
+
+	previewEnabled = true;
+	EnablePreviewDisplay(true);
+}
+
+void OBSBasic::DisablePreview()
+{
+	if (previewProgramMode)
+		return;
+
+	previewEnabled = false;
+	EnablePreviewDisplay(false);
+}
+
 static bool nudge_callback(obs_scene_t*, obs_sceneitem_t *item, void *param)
 {
 	if (obs_sceneitem_locked(item))

UI/window-basic-main.hpp

@@ -324,7 +324,7 @@ private:
 	int GetTopSelectedSourceItem();
 
 	obs_hotkey_pair_id streamingHotkeys, recordingHotkeys,
-	                   replayBufHotkeys;
+	                   replayBufHotkeys, togglePreviewHotkeys;
 	obs_hotkey_id forceStreamingStopHotkey;
 
 	void InitDefaultTransitions();
@@ -526,6 +526,9 @@ private slots:
 	void AudioMixerCopyFilters();
 	void AudioMixerPasteFilters();
 
+	void EnablePreview();
+	void DisablePreview();
+
 private:
 	/* OBS Callbacks */
 	static void SceneReordered(void *data, calldata_t *params);