Add SciDoubleSpinBox for a DoubleSpinBox that supports scientific E notation entry

sdrgui/CMakeLists.txt

@@ -65,6 +65,7 @@ set(sdrgui_SOURCES
     gui/samplingdevicedialog.cpp
     gui/scaleengine.cpp
     gui/scaledimage.cpp
+    gui/scidoublespinbox.cpp
     gui/sdrangelsplash.cpp
     gui/spectrumcalibrationpointsdialog.cpp
     gui/spectrummarkersdialog.cpp
@@ -168,6 +169,7 @@ set(sdrgui_HEADERS
     gui/samplingdevicedialog.h
     gui/scaleengine.h
     gui/scaledimage.h
+    gui/scidoublespinbox.h
     gui/sdrangelsplash.h
     gui/spectrumcalibrationpointsdialog.h
     gui/spectrummarkersdialog.h

sdrgui/gui/scidoublespinbox.cpp

@@ -0,0 +1,60 @@
+///////////////////////////////////////////////////////////////////////////////////
+// Copyright (C) 2022 Jon Beniston, M7RCE                                        //
+//                                                                               //
+// This program is free software; you can redistribute it and/or modify          //
+// it under the terms of the GNU General Public License as published by          //
+// the Free Software Foundation as version 3 of the License, or                  //
+// (at your option) any later version.                                           //
+//                                                                               //
+// This program is distributed in the hope that it will be useful,               //
+// but WITHOUT ANY WARRANTY; without even the implied warranty of                //
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the                  //
+// GNU General Public License V3 for more details.                               //
+//                                                                               //
+// You should have received a copy of the GNU General Public License             //
+// along with this program. If not, see <http://www.gnu.org/licenses/>.          //
+///////////////////////////////////////////////////////////////////////////////////
+
+#include "scidoublespinbox.h"
+
+SciDoubleSpinBox::SciDoubleSpinBox(QWidget *parent) :
+    QDoubleSpinBox(parent)
+{
+}
+
+double SciDoubleSpinBox::valueFromText(const QString &text) const
+{
+    return text.toDouble();
+}
+
+QValidator::State SciDoubleSpinBox::validate(QString &input, int &pos) const
+{
+    bool ok;
+    input.toDouble(&ok);
+    if (ok) {
+        return QValidator::Acceptable;
+    }
+
+    QString validChars = "0123456789+-.e"; // 'C' locale, so no , separator
+
+    for (int i = 0; i < input.size(); i++)
+    {
+        if (validChars.indexOf(input[i]) == -1) {
+            return QValidator::Invalid;
+        }
+    }
+    if (input.count('e') > 1) {
+        return QValidator::Invalid;
+    }
+    if (input.count('.') > 1) {
+        return QValidator::Invalid;
+    }
+    if (input.count('+') > 2) {
+        return QValidator::Invalid;
+    }
+    if (input.count('-') > 2) {
+        return QValidator::Invalid;
+    }
+
+    return QValidator::Intermediate;
+}

sdrgui/gui/scidoublespinbox.h

@@ -0,0 +1,39 @@
+///////////////////////////////////////////////////////////////////////////////////
+// Copyright (C) 2022 Jon Beniston, M7RCE                                        //
+//                                                                               //
+// This program is free software; you can redistribute it and/or modify          //
+// it under the terms of the GNU General Public License as published by          //
+// the Free Software Foundation as version 3 of the License, or                  //
+// (at your option) any later version.                                           //
+//                                                                               //
+// This program is distributed in the hope that it will be useful,               //
+// but WITHOUT ANY WARRANTY; without even the implied warranty of                //
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the                  //
+// GNU General Public License V3 for more details.                               //
+//                                                                               //
+// You should have received a copy of the GNU General Public License             //
+// along with this program. If not, see <http://www.gnu.org/licenses/>.          //
+///////////////////////////////////////////////////////////////////////////////////
+
+#ifndef SDRGUI_GUI_SCIDOUBLESPINBOX_H
+#define SDRGUI_GUI_SCIDOUBLESPINBOX_H
+
+#include <QDoubleSpinBox>
+
+#include "export.h"
+
+// Scientific double spin box.
+// Like a double spin box, except that we additionally scientific E notation for entry
+// (E.g. 4.5e-4)
+class SDRGUI_API SciDoubleSpinBox : public QDoubleSpinBox {
+    Q_OBJECT
+
+public:
+
+    explicit SciDoubleSpinBox(QWidget *parent = nullptr);
+
+    virtual double valueFromText(const QString &text) const;
+    virtual QValidator::State validate(QString &input, int &pos) const;
+};
+
+#endif // SDRGUI_GUI_SCIDOUBLESPINBOX_H