Fix Qt-only build without KF5

The BUILD_WITH_KF5 option was checked with DEFINED, so passing -DBUILD_WITH_KF5=OFF still entered the KF5 setup path.

Skip the KF5 setup when disabled and provide small Qt-only replacements for the KDE color widgets used by .ui files in that build mode.

Assisted-by: pi coding agent / Mika (OpenAI GPT-5.5)

sources/ui/nokde/kcolorbutton.cpp

@@ -0,0 +1,70 @@
+/*
+	Copyright 2006-2026 The QElectroTech Team
+	This file is part of QElectroTech.
+
+	QElectroTech 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 2 of the License, or
+	(at your option) any later version.
+
+	QElectroTech 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 QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#include "kcolorbutton.h"
+
+#include <QColorDialog>
+#include <QPalette>
+
+namespace {
+QColor fallbackColor()
+{
+	return QPalette{}.color(QPalette::Button);
+}
+}
+
+KColorButton::KColorButton(QWidget *parent) :
+	QPushButton{parent},
+	m_color{fallbackColor()}
+{
+	connect(this, &QPushButton::clicked, this, &KColorButton::chooseColor);
+	updateButton();
+}
+
+QColor KColorButton::color() const
+{
+	return m_color;
+}
+
+void KColorButton::setColor(const QColor &color)
+{
+	m_color = color.isValid() ? color : fallbackColor();
+	updateButton();
+}
+
+void KColorButton::chooseColor()
+{
+	const auto selected = QColorDialog::getColor(m_color, this);
+	if (!selected.isValid() || selected == m_color) {
+		return;
+	}
+
+	m_color = selected;
+	updateButton();
+	emit changed(m_color);
+}
+
+void KColorButton::updateButton()
+{
+	setText(m_color.name());
+
+	auto pal = palette();
+	pal.setColor(QPalette::Button, m_color);
+	setAutoFillBackground(true);
+	setPalette(pal);
+	update();
+}

sources/ui/nokde/kcolorbutton.h

@@ -0,0 +1,48 @@
+/*
+	Copyright 2006-2026 The QElectroTech Team
+	This file is part of QElectroTech.
+
+	QElectroTech 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 2 of the License, or
+	(at your option) any later version.
+
+	QElectroTech 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 QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#ifndef QET_KCOLORBUTTON_H
+#define QET_KCOLORBUTTON_H
+
+#include <QColor>
+#include <QPushButton>
+
+class KColorButton : public QPushButton
+{
+		Q_OBJECT
+
+	public:
+		explicit KColorButton(QWidget *parent = nullptr);
+
+		QColor color() const;
+
+	public slots:
+		void setColor(const QColor &color);
+
+	signals:
+		void changed(const QColor &color);
+
+	private slots:
+		void chooseColor();
+
+	private:
+		void updateButton();
+
+		QColor m_color;
+};
+
+#endif // QET_KCOLORBUTTON_H

sources/ui/nokde/kcolorcombo.cpp

@@ -0,0 +1,49 @@
+/*
+	Copyright 2006-2026 The QElectroTech Team
+	This file is part of QElectroTech.
+
+	QElectroTech 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 2 of the License, or
+	(at your option) any later version.
+
+	QElectroTech 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 QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#include "kcolorcombo.h"
+
+#include <QVariant>
+
+KColorCombo::KColorCombo(QWidget *parent) :
+	QComboBox{parent}
+{
+	connect(
+		this,
+		QOverload<int>::of(&QComboBox::activated),
+		this,
+		[this](int index) {
+			emit activated(itemData(index).value<QColor>());
+		});
+}
+
+void KColorCombo::setColors(const QList<QColor> &colors)
+{
+	clear();
+	for (const auto &color : colors) {
+		addItem(color.name(), color);
+	}
+}
+
+QColor KColorCombo::color(int index) const
+{
+	if (index < 0 || index >= count()) {
+		return {};
+	}
+
+	return itemData(index).value<QColor>();
+}

sources/ui/nokde/kcolorcombo.h

@@ -0,0 +1,38 @@
+/*
+	Copyright 2006-2026 The QElectroTech Team
+	This file is part of QElectroTech.
+
+	QElectroTech 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 2 of the License, or
+	(at your option) any later version.
+
+	QElectroTech 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 QElectroTech.  If not, see <http://www.gnu.org/licenses/>.
+*/
+#ifndef QET_KCOLORCOMBO_H
+#define QET_KCOLORCOMBO_H
+
+#include <QColor>
+#include <QComboBox>
+
+class KColorCombo : public QComboBox
+{
+		Q_OBJECT
+
+	public:
+		explicit KColorCombo(QWidget *parent = nullptr);
+
+		void setColors(const QList<QColor> &colors);
+		QColor color(int index) const;
+
+	signals:
+		void activated(const QColor &color);
+};
+
+#endif // QET_KCOLORCOMBO_H