shared/qt: Add IconLabel widget

shared/qt/icon-label/CMakeLists.txt

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+cmake_minimum_required(VERSION 3.22...3.25)
+
+find_package(Qt6 REQUIRED Core Widgets)
+
+add_library(qt-icon-label INTERFACE)
+add_library(OBS::qt-icon-label ALIAS qt-icon-label)
+
+target_sources(qt-icon-label INTERFACE icon-label.hpp)
+target_include_directories(qt-icon-label INTERFACE "${CMAKE_CURRENT_SOURCE_DIR}")
+
+target_link_libraries(qt-icon-label INTERFACE Qt::Core Qt::Widgets)

shared/qt/icon-label/icon-label.hpp

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+/******************************************************************************
+    Copyright (C) 2024 by Sebastian Beckmann
+
+    This program 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.
+
+    This program 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 this program.  If not, see <http://www.gnu.org/licenses/>.
+******************************************************************************/
+
+#pragma once
+
+#include <QIcon>
+#include <QLabel>
+
+/**
+ * Widget to be used if a label is to be supplied a QIcon instead of a QPixmap,
+ * specifically so that qproperty-icon QSS styling (and as a result the OBS
+ * "themeID" property) works on it without having to first convert the icon to
+ * a fixed size PNG and then setting qproperty-pixmap in addition to the
+ * qproperty-icon statements.
+ */
+class IconLabel : public QLabel {
+	Q_OBJECT
+	Q_PROPERTY(QIcon icon READ icon WRITE setIcon)
+	Q_PROPERTY(int iconSize READ iconSize WRITE setIconSize)
+
+public:
+	inline IconLabel(QWidget *parent = nullptr)
+		: QLabel(parent),
+		  m_icon(),
+		  m_iconSize(16)
+	{
+	}
+
+	inline QIcon icon() const { return m_icon; }
+	void setIcon(const QIcon &icon)
+	{
+		m_icon = icon;
+		QLabel::setPixmap(icon.pixmap(m_iconSize));
+	}
+
+	inline int iconSize() const { return m_iconSize; }
+	void setIconSize(int newSize) { m_iconSize = newSize; }
+
+private:
+	QIcon m_icon;
+	int m_iconSize;
+};