Implement drag'n'move.

1 files changed, 31 insertions, 1 deletions

diff --git a/src/outputwindow.cc b/src/outputwindow.cc
index 8c4cb7b..95c3c7b 100644
--- a/src/outputwindow.cc
+++ b/src/outputwindow.cc
@@ -164,6 +164,34 @@ void OutputWindow::reset()
 	}
 }
 
+void OutputWindow::mouseMoveEvent(QMouseEvent* event)
+{
+	if(dragging)
+	{
+		dragOffset = event->pos() - dragOffsetOrigo;
+	}
+}
+
+void OutputWindow::mousePressEvent(QMouseEvent* event)
+{
+	if(event->buttons() & Qt::MiddleButton)
+	{
+		dragging = true;
+		dragOffsetOrigo = event->pos();
+		dragOffset = {};
+	}
+}
+
+void OutputWindow::mouseReleaseEvent(QMouseEvent* event)
+{
+	if(event->buttons() & Qt::MiddleButton)
+	{
+		dragging = false;
+		offset = dragOffsetOrigo - event->pos();
+		dragOffset = dragOffsetOrigo = {};
+	}
+}
+
 void OutputWindow::wheelEvent(QWheelEvent* event)
 {
 	double delta = event->delta() / 120.0 * scale;
@@ -178,7 +206,9 @@ void OutputWindow::paintEvent(QPaintEvent *)
 {
 	//sem.acquire();
 	QPainter painter(this);
-	paint(painter, {width() / 2.0, height() / 2.0}, true, scale);
+	paint(painter,
+	      { width() / 2.0 + offset.x() + dragOffset.x(),
+	        height() / 2.0 + offset.y() + dragOffset.y() }, true, scale);
 	sem.release();
 }