diff -r 7137c20979af -r 40e2940605a3 src/widgets/matrixeditor.cpp
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/src/widgets/matrixeditor.cpp	Wed Mar 18 17:11:23 2020 +0200
@@ -0,0 +1,89 @@
+#include "main.h"
+#include "matrixeditor.h"
+#include "ui_matrixeditor.h"
+#include "../ui/multiplyfactordialog.h"
+
+constexpr char BUTTON_COLUMN_PROPERTY[] = "_ldforge_column";
+
+MatrixEditor::MatrixEditor(const glm::mat4 value, QWidget* parent) :
+	QWidget(parent),
+	ui(new Ui::MatrixEditor)
+{
+	ui->setupUi(this);
+	for (int column = 0; column < countof(this->spinboxes); column += 1)
+	{
+		for (int row = 0; row < countof(this->spinboxes[0]); row += 1)
+		{
+			const QString name = "cell"_q + QString::number(column) + QString::number(row);
+			QDoubleSpinBox** spinbox = &this->spinboxes[column][row];
+			*spinbox = this->findChild<QDoubleSpinBox*>(name);
+			connect(*spinbox, qOverload<double>(&QDoubleSpinBox::valueChanged), [&]()
+			{
+				emit this->valueChanged(this->value());
+			});
+			Q_ASSERT(*spinbox != nullptr);
+		}
+		QAbstractButton* button = this->findChild<QAbstractButton*>("multiply"_q + QString::number(column));
+		button->setProperty(BUTTON_COLUMN_PROPERTY, column);
+		connect(button, &QAbstractButton::clicked, this, &MatrixEditor::multiplyButtonPressed);
+	}
+	this->setValue(value);
+}
+
+MatrixEditor::MatrixEditor(QWidget *parent) :
+	MatrixEditor{glm::mat4{1}, parent}
+{
+}
+
+MatrixEditor::~MatrixEditor()
+{
+	delete ui;
+}
+
+glm::mat4 MatrixEditor::value() const
+{
+	glm::mat4 result{1};
+	for (int column = 0; column < countof(this->spinboxes); column += 1)
+	{
+		for (int row = 0; row < countof(this->spinboxes[0]); row += 1)
+		{
+			result[column][row] = this->spinboxes[column][row]->value();
+		}
+	}
+	return result;
+}
+
+void MatrixEditor::setValue(const glm::mat4& value)
+{
+	for (int column = 0; column < countof(this->spinboxes); column += 1)
+	{
+		for (int row = 0; row < countof(this->spinboxes[0]); row += 1)
+		{
+			QDoubleSpinBox* spinbox = this->spinboxes[column][row];
+			QSignalBlocker blocker{spinbox};
+			spinbox->setValue(value[column][row]);
+		}
+	}
+}
+
+void MatrixEditor::multiplyButtonPressed()
+{
+	QAbstractButton* button = qobject_cast<QAbstractButton*>(this->sender());
+	if (button != nullptr)
+	{
+		bool ok;
+		const int column = button->property(BUTTON_COLUMN_PROPERTY).toInt(&ok);
+		if (ok and column >= 0 and column < this->matrixSize())
+		{
+			glm::mat4 newValue = this->value();
+			MultiplyFactorDialog dialog{newValue[column], this};
+			const int result = dialog.exec();
+			if (result == QDialog::Accepted)
+			{
+				newValue[column] = glm::vec4{dialog.value(), (column == 3) ? 1 : 0};
+				this->setValue(newValue);
+				emit valueChanged(newValue);
+			}
+		}
+	}
+}