Add scene selection class and widget

src/headers/scene-selection.hpp

@@ -0,0 +1,51 @@
+#pragma once
+#include "scene-group.hpp"
+#include "utility.hpp"
+
+#include <QComboBox>
+
+enum class SceneSelectionType {
+	SCENE,
+	GROUP,
+	PREVIOUS,
+	CURRENT,
+};
+
+class SceneSelection {
+public:
+	void Save(obs_data_t *obj, const char *name = "scene",
+		  const char *typeName = "sceneType");
+	void Load(obs_data_t *obj, const char *name = "scene",
+		  const char *typeName = "sceneType");
+
+	SceneSelectionType GetType() { return _type; }
+	OBSWeakSource GetScene(bool advance = true);
+	std::string ToString();
+
+private:
+	OBSWeakSource _scene;
+	SceneGroup *_group = nullptr;
+	SceneSelectionType _type = SceneSelectionType::SCENE;
+	friend class SceneSelectionWidget;
+};
+
+class SceneSelectionWidget : public QComboBox {
+	Q_OBJECT
+
+public:
+	SceneSelectionWidget(QWidget *parent, bool sceneGroups = false,
+			     bool previous = false, bool current = false);
+	void SetScene(SceneSelection &);
+signals:
+	void SceneChanged(const SceneSelection &);
+
+private slots:
+	void SelectionChanged(const QString &name);
+	void SceneGroupAdd(const QString &name);
+	void SceneGroupRemove(const QString &name);
+	void SceneGroupRename(const QString &oldName, const QString &newName);
+
+private:
+	bool IsCurrentSceneSelected(const QString &name);
+	bool IsPreviousSceneSelected(const QString &name);
+};