From 67e6994595f37fc3df67fa4a679b1228ad0bb953 Mon Sep 17 00:00:00 2001
From: Martin Vajnar <Martin.Vajnar@cvut.cz>
Date: Tue, 3 Apr 2018 13:11:22 +0200
Subject: [PATCH] Shape: Capture wheel event in QWidget and use it for scaling
 and rotation

---
 orte/contrib/shape/MyQFrame.cpp | 13 +++++++++++++
 orte/contrib/shape/MyQFrame.h   |  3 +++
 2 files changed, 16 insertions(+)

diff --git a/orte/contrib/shape/MyQFrame.cpp b/orte/contrib/shape/MyQFrame.cpp
index 08b2140..370e320 100644
--- a/orte/contrib/shape/MyQFrame.cpp
+++ b/orte/contrib/shape/MyQFrame.cpp
@@ -8,6 +8,7 @@
 #include <QPolygon>
 #include <QMouseEvent>
 #include <QPaintEvent>
+#include <QWheelEvent>
 #include <QKeyEvent>
 
 MyQFrame::MyQFrame( QWidget *parent)
@@ -16,6 +17,8 @@ MyQFrame::MyQFrame( QWidget *parent)
     mousePressed=0;
     objects[0]=objects[1]=objects[2]=objects[3]=objects[4]=0;
     rotation_mode=0;
+    wheel_delta=0;
+    scale_factor=1;
 
     setFocusPolicy(Qt::StrongFocus);
 
@@ -96,6 +99,16 @@ void MyQFrame::mouseReleaseEvent (QMouseEvent *)
 {
     mousePressed=0;
 }
+
+void MyQFrame::wheelEvent (QWheelEvent *e)
+{
+    if(!rotation_mode)
+      wheel_delta += e->delta()/120;
+    else
+      scale_factor += (double)e->delta()/1200;
+    e->accept();
+}
+
 void MyQFrame::keyPressEvent (QKeyEvent *e)
 {
     if (e->key() == Qt::Key_Control)
diff --git a/orte/contrib/shape/MyQFrame.h b/orte/contrib/shape/MyQFrame.h
index 16894c2..344db3d 100644
--- a/orte/contrib/shape/MyQFrame.h
+++ b/orte/contrib/shape/MyQFrame.h
@@ -23,6 +23,7 @@ protected:
     void mousePressEvent(QMouseEvent *e);
     void mouseReleaseEvent(QMouseEvent *e);
     void paintEvent(QPaintEvent*);
+    void wheelEvent(QWheelEvent*);
     void keyPressEvent(QKeyEvent*);
     void keyReleaseEvent(QKeyEvent*);
 
@@ -43,7 +44,9 @@ public:
     int mousePressed;
     int mouseX;
     int mouseY;
+    int wheel_delta;
     int rotation_mode;
+    double scale_factor;
 
 signals:
     void changed(void);
-- 
2.39.2