implement ship modules

src/ui/ShipLayoutPreview.h

@@ -0,0 +1,38 @@
+#pragma once
+
+#include <string>
+#include <vector>
+
+#include <QWidget>
+
+#include "ModulesConfig.h"
+#include "ShipLayout.h"
+
+class ShipLayoutPreview : public QWidget
+{
+    Q_OBJECT
+
+public:
+    explicit ShipLayoutPreview(QWidget* parent = nullptr);
+
+    void setShipAndLayout(const std::vector<std::string>& shipLayout,
+                          const ShipLayoutConfig& layout,
+                          const std::vector<ModuleDef>* modules);
+    void clear();
+
+protected:
+    void paintEvent(QPaintEvent* event) override;
+
+private:
+    struct CellInfo
+    {
+        bool buildable;
+        int moduleIndex; // -1 if empty
+    };
+
+    std::vector<std::vector<CellInfo>> m_grid;
+    std::vector<PlacedModule> m_placedModules;
+    const std::vector<ModuleDef>* m_modules;
+    int m_rows;
+    int m_cols;
+};