Add macro action "random" (#353)

This should be expanded upon by adding the ability to add weights to each macro.

src/headers/macro-action-random.hpp

@@ -0,0 +1,63 @@
+#pragma once
+#include "macro-action-edit.hpp"
+#include "macro-selection.hpp"
+
+#include <QPushButton>
+#include <QListWidget>
+#include <unordered_map>
+
+class MacroActionRandom : public MultiMacroRefAction {
+public:
+	bool PerformAction();
+	void LogAction();
+	bool Save(obs_data_t *obj);
+	bool Load(obs_data_t *obj);
+	std::string GetId() { return id; };
+	static std::shared_ptr<MacroAction> Create()
+	{
+		return std::make_shared<MacroActionRandom>();
+	}
+
+	// TODO: add weights to each macro ...
+	// std::unordered_map<MacroRef, int> _weights;
+
+private:
+	MacroRef lastRandomMacro;
+	static bool _registered;
+	static const std::string id;
+};
+
+class MacroActionRandomEdit : public QWidget {
+	Q_OBJECT
+
+public:
+	MacroActionRandomEdit(
+		QWidget *parent,
+		std::shared_ptr<MacroActionRandom> entryData = nullptr);
+	void UpdateEntryData();
+	static QWidget *Create(QWidget *parent,
+			       std::shared_ptr<MacroAction> action)
+	{
+		return new MacroActionRandomEdit(
+			parent,
+			std::dynamic_pointer_cast<MacroActionRandom>(action));
+	}
+
+private slots:
+	void MacroRemove(const QString &name);
+	void MacroRename(const QString &oldName, const QString &newName);
+	void AddMacro();
+	void RemoveMacro();
+	int FindEntry(const std::string &macro);
+	void MacroSelectionChanged(int idx);
+
+protected:
+	std::shared_ptr<MacroActionRandom> _entryData;
+
+private:
+	MacroSelection *_macroSelection;
+	QListWidget *_macroList;
+	QPushButton *_add;
+	QPushButton *_remove;
+	bool _loading = true;
+};

src/headers/macro.hpp

@@ -145,3 +145,9 @@ public:
 	void ResolveMacroRef();
 	MacroRef _macro;
 };
+
+class MultiMacroRefAction : public MacroAction {
+public:
+	void ResolveMacroRef();
+	std::vector<MacroRef> _macros;
+};