Add a file picker

mainwindow.cpp

@@ -13,6 +13,7 @@ MainWindow::MainWindow()
     addDockWidget(Qt::LeftDockWidgetArea, dock);
 
     connect(dock, SIGNAL(fftSizeChanged(int)), &spectrogram, SLOT(setFFTSize(int)));
+    connect(dock->fileOpenButton, SIGNAL(clicked()), &spectrogram, SLOT(pickFile()));
     connect(dock->powerMaxSlider, SIGNAL(valueChanged(int)), &spectrogram, SLOT(setPowerMax(int)));
     connect(dock->powerMinSlider, SIGNAL(valueChanged(int)), &spectrogram, SLOT(setPowerMin(int)));
 }

spectrogram.cpp

@@ -2,16 +2,16 @@
 
 #include <QDebug>
 #include <QElapsedTimer>
+#include <QFileDialog>
 #include <QPainter>
 #include <QPaintEvent>
 #include <QRect>
 
 Spectrogram::Spectrogram()
 {
-	inputSource = new InputSource("/home/mike/Downloads/hubsan-chopped.cfile", 1024);
+	inputSource = nullptr;
 	powerMax = 0.0f;
 	powerMin = -50.0f;
-	resize(inputSource->GetWidth(), inputSource->GetHeight());
 }
 
 Spectrogram::~Spectrogram()
@@ -19,6 +19,24 @@ Spectrogram::~Spectrogram()
 	delete inputSource;
 }
 
+void Spectrogram::pickFile()
+{
+	QString fileName = QFileDialog::getOpenFileName(
+		this, tr("Open File"), "", tr("Sample file (*.cfile *.bin);;All files (*.*)")
+	);
+	if (fileName != nullptr) {
+		try {
+			InputSource *newFile = new InputSource(fileName.toUtf8().constData(), (inputSource != nullptr) ? inputSource->GetWidth() : 1024);
+			delete inputSource;
+			inputSource = newFile;
+			resize(inputSource->GetWidth(), inputSource->GetHeight());
+		} catch (std::runtime_error e) {
+			// TODO: display error
+			return;
+		}
+	}
+}
+
 template <class T> const T& clamp (const T& value, const T& min, const T& max) {
     return std::min(max, std::max(min, value));
 }

spectrogram.h

@@ -11,6 +11,7 @@ public:
 	~Spectrogram();
 
 public slots:
+	void pickFile();
 	void setFFTSize(int size);
 	void setPowerMax(int power);
 	void setPowerMin(int power);

spectrogramcontrols.cpp

@@ -7,6 +7,9 @@ SpectrogramControls::SpectrogramControls(const QString & title, QWidget * parent
 	widget = new QWidget(this);
 	layout = new QFormLayout(widget);
 
+	fileOpenButton = new QPushButton("Open file...", widget);
+	layout->addRow(fileOpenButton);
+
 	fftSizeSlider = new QSlider(Qt::Horizontal, widget);
 	fftSizeSlider->setRange(7, 13);
 	fftSizeSlider->setValue(10);

spectrogramcontrols.h

@@ -2,6 +2,7 @@
 
 #include <QDockWidget>
 #include <QFormLayout>
+#include <QPushButton>
 #include <QSlider>
 
 class SpectrogramControls : public QDockWidget {
@@ -21,6 +22,7 @@ private:
 	QFormLayout *layout;
 	QSlider *fftSizeSlider;
 public:
+	QPushButton *fileOpenButton;
 	QSlider *powerMaxSlider;
 	QSlider *powerMinSlider;
 };