Add recordpanel beside datagrid

pglab/crud/RecordPanel.h

@@ -0,0 +1,55 @@
+#ifndef RECORDPANEL_H
+#define RECORDPANEL_H
+
+#include <QScrollArea>
+#include <QPersistentModelIndex>
+#include <vector>
+
+class QAbstractItemModel;
+class QEvent;
+class QToolButton;
+
+/** Shows the values of one row of a model as a scrollable list, one line per column.
+ *  Values are edited through the model so the pending change logic of the model is reused.
+ */
+class RecordPanel : public QScrollArea {
+	Q_OBJECT
+public:
+	explicit RecordPanel(QWidget *parent = nullptr);
+
+	/// Sets the model to show, the columns from firstDataColumn on are shown
+	void setModel(QAbstractItemModel *model);
+	/// Columns before this one are skipped, e.g. the row number column of the CRUD model
+	void setFirstDataColumn(int column);
+	/// Shows the values of the given row of the model, -1 shows nothing
+	void setCurrentRow(int row);
+
+protected:
+	bool eventFilter(QObject *watched, QEvent *event) override;
+
+private slots:
+	void refresh();
+	void onModelReset();
+
+private:
+	struct FieldRow {
+		int column = -1;
+		QString original; ///< Text the editor shows, only a different text is written back
+		QWidget *editor = nullptr;
+		QToolButton *expandButton = nullptr;
+	};
+
+	void clearFields();
+	void rebuild();
+	void showValue(FieldRow &field, const QString &text, bool editable);
+	void commitEditor(QWidget *editor);
+	FieldRow *findField(QWidget *editor);
+
+	QAbstractItemModel *m_model = nullptr;
+	int m_firstDataColumn = 0;
+	QPersistentModelIndex m_rowIndex;
+	std::vector<FieldRow> m_fields;
+	bool m_updating = false;
+};
+
+#endif // RECORDPANEL_H