From 8ad29ad99c41acf22e9406b6e32f7ca8cb1a4184 Mon Sep 17 00:00:00 2001
From: Alfonso Ruzafa <alfonso.ruzafa@cabify.com>
Date: Sat, 30 Apr 2022 13:45:02 +0200
Subject: [PATCH] macOS mouse gestures experiment

---
 common/lc_view.cpp       | 28 ++++++++++++++++++++
 common/lc_view.h         |  3 +++
 common/lc_viewwidget.cpp | 55 ++++++++++++++++++++++++++++++++++++++++
 common/lc_viewwidget.h   |  4 +++
 4 files changed, 90 insertions(+)

diff --git a/common/lc_view.cpp b/common/lc_view.cpp
index 8dd6f2e0..f418d53a 100644
--- a/common/lc_view.cpp
+++ b/common/lc_view.cpp
@@ -2934,3 +2934,31 @@ void lcView::OnMouseWheel(float Direction)
 
 	mModel->Zoom(mCamera, static_cast<int>(Direction * Scale));
 }
+
+void lcView::OnZoomNativeGesture(float Value)
+{
+	float Scale = 10.0f;
+
+	mModel->Zoom(mCamera, static_cast<int>(Value * Scale));
+}
+
+
+void lcView::OnRotateNativeGesture(float Value)
+{
+	lcModel* ActiveModel = GetActiveModel();
+
+	if (!ActiveModel)
+		return;
+
+	ActiveModel->UpdateRollTool(mCamera, Value * LC_DTOR);
+}
+
+void lcView::OnWheel(int x, int y)
+{
+	lcModel* ActiveModel = GetActiveModel();
+
+	if (!ActiveModel)
+		return;
+
+	ActiveModel->UpdatePanTool(mCamera, lcVector3(x, y, 0));
+}
diff --git a/common/lc_view.h b/common/lc_view.h
index 7d86453b..78ff581a 100644
--- a/common/lc_view.h
+++ b/common/lc_view.h
@@ -223,6 +223,9 @@ public:
 	void OnForwardButtonUp();
 	void OnMouseMove();
 	void OnMouseWheel(float Direction);
+	void OnZoomNativeGesture(float Value);
+	void OnRotateNativeGesture(float Value);
+	void OnWheel(int x, int y);
 	void BeginDrag(lcDragState DragState);
 	void EndDrag(bool Accept);
 
diff --git a/common/lc_viewwidget.cpp b/common/lc_viewwidget.cpp
index 41c88b66..d5384f0b 100644
--- a/common/lc_viewwidget.cpp
+++ b/common/lc_viewwidget.cpp
@@ -215,6 +215,61 @@ void lcViewWidget::mouseMoveEvent(QMouseEvent* MouseEvent)
 	mView->OnMouseMove();
 }
 
+bool lcViewWidget::event(QEvent *event)
+{
+	qDebug() << "event: " << event;
+	QNativeGestureEvent *nativeGesture;
+	QWheelEvent *wheelEvent;
+	QPoint point;
+	switch (event->type())
+	{
+		case QEvent::NativeGesture:
+			nativeGesture = static_cast<QNativeGestureEvent *>(event);
+			switch (nativeGesture->gestureType()) {
+				case Qt::BeginNativeGesture:
+					mNativeGestureAccumulator = 0.0f;
+					break;
+				case Qt::ZoomNativeGesture:
+					mView->OnZoomNativeGesture(nativeGesture->value() * 8);
+					break;
+				case Qt::RotateNativeGesture:
+					qDebug() << "nativeGesture: " << nativeGesture;
+					mNativeGestureAccumulator += nativeGesture->value();
+					mView->OnRotateNativeGesture(mNativeGestureAccumulator);
+					break;
+				case Qt::SwipeNativeGesture:
+				case Qt::PanNativeGesture:
+				case Qt::EndNativeGesture:
+				case Qt::SmartZoomNativeGesture:
+					break;
+			}
+			return true;
+		case QEvent::Wheel:
+			wheelEvent = static_cast<QWheelEvent *>(event);
+			switch (wheelEvent->phase())
+			{
+				case Qt::ScrollBegin:
+					mx0 = 0;
+					my0 = 0;
+					break;
+				case Qt::ScrollUpdate:
+				case Qt::ScrollMomentum:
+					point = wheelEvent->pixelDelta();
+					mx0 += point.x();
+					my0 += point.y();
+					mView->OnWheel(mx0, my0);
+					break;
+				case Qt::ScrollEnd:
+				case Qt::NoScrollPhase:
+					break;
+			}
+			return true;
+
+		default:
+			return QWidget::event(event);
+	}
+}
+
 void lcViewWidget::wheelEvent(QWheelEvent* WheelEvent)
 {
 	if (WheelEvent->angleDelta().y() == 0)
diff --git a/common/lc_viewwidget.h b/common/lc_viewwidget.h
index b8e849bc..3152a2f9 100644
--- a/common/lc_viewwidget.h
+++ b/common/lc_viewwidget.h
@@ -35,6 +35,7 @@ protected:
 	void mouseDoubleClickEvent(QMouseEvent* MouseEvent) override;
 	void mouseMoveEvent(QMouseEvent* MouseEvent) override;
 	void wheelEvent(QWheelEvent* WheelEvent) override;
+	bool event(QEvent* event) override;
 	void dragEnterEvent(QDragEnterEvent* DragEnterEvent) override;
 	void dragLeaveEvent(QDragLeaveEvent* DragLeaveEvent) override;
 	void dragMoveEvent(QDragMoveEvent* DragMoveEvent) override;
@@ -43,4 +44,7 @@ protected:
 	std::unique_ptr<lcView> mView;
 	QSize mPreferredSize;
 	int mWheelAccumulator = 0;
+	float mNativeGestureAccumulator = 0;
+	int mx0 = 0;
+	int my0 = 0;
 };