From d5ebd4f2cf9ba81ea358507523bc3aefbde9cfe0 Mon Sep 17 00:00:00 2001
From: Mike Walters <mike@flomp.net>
Date: Wed, 2 Mar 2016 23:36:25 +0000
Subject: [PATCH] plot: Convert PlotView to derive from QAbstractScrollArea

---
 mainwindow.cpp | 6 +-----
 mainwindow.h   | 1 -
 plotview.cpp   | 4 ++--
 plotview.h     | 4 ++--
 4 files changed, 5 insertions(+), 10 deletions(-)

diff --git a/mainwindow.cpp b/mainwindow.cpp
index b284629..737f8e9 100644
--- a/mainwindow.cpp
+++ b/mainwindow.cpp
@@ -26,17 +26,13 @@
 MainWindow::MainWindow()
 {
     setWindowTitle(tr("inspectrum"));
-    scrollArea.viewport()->installEventFilter(this);
 
     dock = new SpectrogramControls(tr("Controls"), this);
     dock->setAllowedAreas(Qt::LeftDockWidgetArea | Qt::RightDockWidgetArea);
     addDockWidget(Qt::LeftDockWidgetArea, dock);
 
     plots = new PlotView();
-    QVBoxLayout *layout = new QVBoxLayout;
-    layout->addWidget(plots);
-    scrollArea.setLayout(layout);
-    setCentralWidget(&scrollArea);
+    setCentralWidget(plots);
 }
 
 void MainWindow::openFile(QString fileName)
diff --git a/mainwindow.h b/mainwindow.h
index b5510c2..5601386 100644
--- a/mainwindow.h
+++ b/mainwindow.h
@@ -36,7 +36,6 @@ public slots:
     void openFile(QString fileName);
 
 private:
-    QScrollArea scrollArea;
     SpectrogramControls *dock;
     PlotView *plots;
 };
diff --git a/plotview.cpp b/plotview.cpp
index b01e2dd..7f8fca4 100644
--- a/plotview.cpp
+++ b/plotview.cpp
@@ -33,7 +33,7 @@
 
 PlotView::PlotView()
 {
-
+    setHorizontalScrollBarPolicy(Qt::ScrollBarAlwaysOn);
 }
 
 void PlotView::refreshSources()
@@ -117,7 +117,7 @@ void PlotView::paintEvent(QPaintEvent *event)
     if (lastSample - firstSample <= 0) return;
 
     QRect rect = QRect(0, 0, width(), height());
-    QPainter painter(this);
+    QPainter painter(viewport());
     painter.fillRect(rect, Qt::black);
 
 
diff --git a/plotview.h b/plotview.h
index 9a9d3be..2600ade 100644
--- a/plotview.h
+++ b/plotview.h
@@ -19,12 +19,12 @@
 
 #pragma once
 
-#include <QDockWidget>
+#include <QAbstractScrollArea>
 #include <QPaintEvent>
 #include "inputsource.h"
 #include "plot.h"
 
-class PlotView : public QDockWidget
+class PlotView : public QAbstractScrollArea
 {
     Q_OBJECT