drawing reworked into c++ plugin, moved input handler to Interactions.qml as a PointHandler

Plugins/ZShell/Internal/strokecanvasitem.cpp

@@ -0,0 +1,68 @@
+#include "strokecanvasitem.hpp"
+#include "strokecanvasrenderer.hpp"
+#include <qnamespace.h>
+
+namespace ZShell::internal {
+
+StrokeCanvasItem::StrokeCanvasItem(QQuickItem *parent) : QCanvasPainterItem(parent) {
+	setFillColor(Qt::transparent);
+	setAlphaBlending(true);
+}
+
+QCanvasPainterItemRenderer *StrokeCanvasItem::createItemRenderer() const {
+	return new StrokeCanvasRenderer;
+}
+
+void StrokeCanvasItem::setPenColor(const QColor &color) {
+	if (m_penColor == color)
+		return;
+
+	m_penColor = color;
+	update();
+
+	emit penColorChanged();
+}
+
+void StrokeCanvasItem::setPenWidth(float width) {
+	if (qFuzzyCompare(m_penWidth, width))
+		return;
+
+	m_penWidth = width;
+	update();
+
+	emit penWidthChanged();
+}
+
+void StrokeCanvasItem::beginStroke(qreal x, qreal y) {
+	m_currentStroke.points.clear();
+	m_currentStroke.points.append({x, y});
+
+	m_currentStroke.color = m_penColor;
+	m_currentStroke.width = m_penWidth;
+
+	update();
+}
+
+void StrokeCanvasItem::appendPoint(qreal x, qreal y) {
+	m_currentStroke.points.append({x, y});
+	update();
+}
+
+void StrokeCanvasItem::endStroke() {
+	if (m_currentStroke.points.isEmpty())
+		return;
+
+	m_strokes.append(m_currentStroke);
+	m_currentStroke.points.clear();
+
+	update();
+}
+
+void StrokeCanvasItem::clear() {
+	m_strokes.clear();
+	m_currentStroke.points.clear();
+
+	update();
+}
+
+};