Replacement for KColorCombo

sources/colorcombobox.cpp

@@ -0,0 +1,98 @@
+/*
+	Copyright 2006-2025 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 "colorcombobox.h"
+
+#include "colorcomboboxdelegate.h"
+
+#include <QColorDialog>
+#include <QPainter>
+#include <QStylePainter>
+#include <Qt>
+
+
+/**
+	@brief ColorComboBox::ColorComboBox
+	Simple constructor
+	@param parent QObject parent of the ColorComboBox
+*/
+ColorComboBox::ColorComboBox(QWidget *parent) : QComboBox(parent)
+{
+	connect(this, &QComboBox::activated, this, &ColorComboBox::colorSelected);
+	setItemDelegate(new ColorComboBoxDelegate());
+}
+
+/**
+	@brief ColorComboBox::setColors
+	Sets the colors of the combo box. An item at the top will be added to allow selection
+	of a custom color.
+	@param colors Vector of colors to add to the combo box
+*/
+void ColorComboBox::setColors(const QVector<QColor> &colors)
+{
+	addItem(tr("[Custom color...]"), QColor(Qt::black));
+	for(auto &color : colors) {
+		addItem(color.name(), color);
+	}
+}
+
+/**
+	@brief ColorComboBox::colorSelected
+	Opens a color selection dialog and lets the user select a color.
+	@param checked Not used
+*/
+void ColorComboBox::colorSelected(int index)
+{
+	if (index == 0) {
+		// Open color selection dialog if custom color is selected
+		auto new_color = QColorDialog::getColor(itemData(index).value<QColor>(), this, tr("Select color"), QColorDialog::DontUseNativeDialog);
+
+		// Validate and emit user input color
+		if (new_color.isValid()) {
+			setItemData(index, new_color);
+			emit activated(new_color);
+		}
+	} else {
+		// Emit color from selected combo box row
+		emit activated(itemData(index).value<QColor>());
+	}
+}
+
+/**
+	@brief ColorComboBox::paintEvent
+	Paints a filled rectangle with the current selected color on the combo box surface.
+	@param e Paint event context
+*/
+void ColorComboBox::paintEvent(QPaintEvent *e) {
+	// Padding for the color indicator
+	const int padding_x = 5;
+	const int padding_y = 5;
+
+	// Create painter and draw a vanilla combobox
+	QStylePainter painter(this);
+	QStyleOptionComboBox opt;
+    initStyleOption(&opt);
+	painter.drawComplexControl(QStyle::CC_ComboBox, opt);
+    
+	// Get dimensions of the combo box paint surface
+	auto r_width = painter.device()->width();
+	auto r_height = painter.device()->height();
+
+	// Paint a rectangle with a margin
+	auto color_indicator = QRect(padding_x, padding_y, r_width - padding_x * 2, r_height - padding_y * 2);
+	painter.fillRect(color_indicator, itemData(currentIndex()).value<QColor>());
+}