In MergeView, replace QTableWidget with QTableView with custom model (#266,#217)

QTableWidget was a major bottleneck for large merge sources (#217). This is because a QTableWidgetItem needed to be created for every field in every record of the merge data, whether they are being displayed or not. This was not a problem for small merge sources (only a few dozen records max), however for larger data sets this would severely affect performance and make the application unresponsive. QTableView only renders the fields and records currently visible.
2025-12-10 13:17:25 -05:00
parent f1e50d8574
commit 6c10571ba4
6 changed files with 291 additions and 161 deletions
@@ -0,0 +1,80 @@
+/*  MergeTableModel.h
+ *
+ *  Copyright (C) 2025  Jaye Evins <evins@snaught.com>
+ *
+ *  This file is part of gLabels-qt.
+ *
+ *  gLabels-qt is free software: you can redistribute it and/or modify
+ *  it under the terms of the GNU General Public License as published by
+ *  the Free Software Foundation, either version 3 of the License, or
+ *  (at your option) any later version.
+ *
+ *  gLabels-qt is distributed in the hope that it will be useful,
+ *  but WITHOUT ANY WARRANTY; without even the implied warranty of
+ *  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ *  GNU General Public License for more details.
+ *
+ *  You should have received a copy of the GNU General Public License
+ *  along with gLabels-qt.  If not, see <http://www.gnu.org/licenses/>.
+ */
+
+#ifndef MergeTableModel_h
+#define MergeTableModel_h
+
+
+#include "merge/Merge.h"
+
+#include <QAbstractTableModel>
+
+
+namespace glabels
+{
+
+	///
+	/// MergeTable proxy model
+	///
+	class MergeTableModel : public QAbstractTableModel
+	{
+		Q_OBJECT
+
+		/////////////////////////////////
+		// Life Cycle
+		/////////////////////////////////
+	public:
+		MergeTableModel( merge::Merge* merge, QObject* parent = nullptr );
+
+
+		/////////////////////////////////
+		// Public methods
+		/////////////////////////////////
+	public:
+		int rowCount( const QModelIndex& parent = QModelIndex() ) const override;
+		int columnCount( const QModelIndex &parent = QModelIndex() ) const override;
+
+		QVariant headerData( int section, Qt::Orientation orientation, int role = Qt::DisplayRole ) const override;
+		QVariant data( const QModelIndex& index, int role = Qt::DisplayRole ) const override;
+		bool setData( const QModelIndex& index, const QVariant& value, int role = Qt::EditRole ) override;
+		Qt::ItemFlags flags( const QModelIndex& index ) const override;
+		
+
+		/////////////////////////////////
+		// Private slots
+		/////////////////////////////////
+	private slots:
+		void onSelectionChanged();
+
+
+		/////////////////////////////////
+		// Private Members
+		/////////////////////////////////
+	private:
+		merge::Merge* mMerge;
+
+		QStringList mDisplayKeys;
+		
+	};
+
+}
+
+
+#endif // MergeTableModel_h