From 03a3ca423d3d508853fccd0a204e902aea99a4e9 Mon Sep 17 00:00:00 2001
From: Elliott Liggett <kilocharlie8@gmail.com>
Date: Mon, 20 Apr 2020 21:10:20 -0700
Subject: [PATCH] Added preliminary mouse scrolling support for the waterfall
 and plot area. As it stands, scrolling basically rotates the tuning knob. No
 modifier keys are supported yet, but we'll get there!

---
 wfmain.cpp | 20 ++++++++++++++++++++
 wfmain.h   |  2 ++
 2 files changed, 22 insertions(+)

diff --git a/wfmain.cpp b/wfmain.cpp
index c1bcbf7..9e3e093 100644
--- a/wfmain.cpp
+++ b/wfmain.cpp
@@ -270,6 +270,9 @@ wfmain::wfmain(QWidget *parent) :
     connect(wf, SIGNAL(mouseDoubleClick(QMouseEvent*)), this, SLOT(handleWFDoubleClick(QMouseEvent*)));
     connect(plot, SIGNAL(mousePress(QMouseEvent*)), this, SLOT(handlePlotClick(QMouseEvent*)));
     connect(wf, SIGNAL(mousePress(QMouseEvent*)), this, SLOT(handleWFClick(QMouseEvent*)));
+    connect(wf, SIGNAL(mouseWheel(QWheelEvent*)), this, SLOT(handleWFScroll(QWheelEvent*)));
+    connect(plot, SIGNAL(mouseWheel(QWheelEvent*)), this, SLOT(handlePlotScroll(QWheelEvent*)));
+
 
     ui->plot->addGraph(); // primary
     ui->plot->addGraph(0, 0); // secondary, peaks, same axis as first?
@@ -1100,6 +1103,23 @@ void wfmain::handleWFClick(QMouseEvent *me)
     showStatusBarText(QString("Selected %1 MHz").arg(x));
 }
 
+void wfmain::handleWFScroll(QWheelEvent *we)
+{
+    // The wheel event is typically
+    // .y() and is +/- 120.
+    // We will click the dial once for every 120 received.
+    //QPoint delta = we->angleDelta();
+    // The minus is there because it felt more natural that way.
+    int steps = we->angleDelta().y() / 120;
+    ui->freqDial->setValue( ui->freqDial->value() - (steps)*ui->freqDial->singleStep() );
+}
+
+void wfmain::handlePlotScroll(QWheelEvent *we)
+{
+    int steps = we->angleDelta().y() / 120;
+    ui->freqDial->setValue( ui->freqDial->value() - (steps)*ui->freqDial->singleStep() );
+}
+
 void wfmain::on_startBtn_clicked()
 {
     emit spectOutputEnable();
diff --git a/wfmain.h b/wfmain.h
index a5ad8b1..c93b975 100644
--- a/wfmain.h
+++ b/wfmain.h
@@ -116,6 +116,8 @@ private slots:
     void handlePlotDoubleClick(QMouseEvent *);
     void handleWFClick(QMouseEvent *);
     void handleWFDoubleClick(QMouseEvent *);
+    void handleWFScroll(QWheelEvent *);
+    void handlePlotScroll(QWheelEvent *);
     void runDelayedCommand();
     void showStatusBarText(QString text);