Initial commit

src/launcher/include/gameListTreeWidget.h

@@ -0,0 +1,73 @@
+#ifndef GAME_LIST_TREE_WIDGET_H
+#define GAME_LIST_TREE_WIDGET_H
+
+#include <QColor>
+#include <QPaintEvent>
+#include <QPainter>
+#include <QPalette>
+#include <QPixmap>
+#include <QPoint>
+#include <QResizeEvent>
+#include <QString>
+#include <QTreeWidget>
+
+class GameListTreeWidget: public QTreeWidget {
+public:
+	explicit GameListTreeWidget(QWidget* parent = nullptr): QTreeWidget(parent) {
+		setAutoFillBackground(false);
+		viewport()->setAutoFillBackground(false);
+	}
+
+	void SetBackgroundImage(const QString& path) {
+		if (m_path == path) {
+			return;
+		}
+		m_path   = path;
+		m_source = QPixmap();
+		if (!path.isEmpty()) {
+			m_source.load(path);
+		}
+		UpdateScaledBackground();
+		viewport()->update();
+	}
+
+protected:
+	void resizeEvent(QResizeEvent* event) override {
+		QTreeWidget::resizeEvent(event);
+		UpdateScaledBackground();
+	}
+
+	void paintEvent(QPaintEvent* event) override {
+		{
+			QPainter painter(viewport());
+			if (m_scaled.isNull()) {
+				painter.fillRect(event->rect(), palette().brush(QPalette::Base));
+			} else {
+				painter.drawPixmap(m_scaled_pos, m_scaled);
+				painter.fillRect(event->rect(), QColor(0, 0, 0, 115));
+			}
+		}
+
+		QTreeWidget::paintEvent(event);
+	}
+
+private:
+	void UpdateScaledBackground() {
+		m_scaled = QPixmap();
+		if (m_source.isNull() || viewport()->size().isEmpty()) {
+			return;
+		}
+
+		m_scaled     = m_source.scaled(viewport()->size(), Qt::KeepAspectRatioByExpanding,
+		                               Qt::FastTransformation);
+		m_scaled_pos = QPoint((viewport()->width() - m_scaled.width()) / 2,
+		                      (viewport()->height() - m_scaled.height()) / 2);
+	}
+
+	QString m_path;
+	QPixmap m_source;
+	QPixmap m_scaled;
+	QPoint  m_scaled_pos;
+};
+
+#endif // GAME_LIST_TREE_WIDGET_H