Minor GUI improvements

- allow 'wrong' input for unit edits where only one case makes sense (e.g. 10mHz for 10MHz)
- fix behavior when changing center of span would exceed the allowed range
- only change value for level or points when editing is finished (not on every keyboard input)

Software/PC_Application/CustomWidgets/siunitedit.cpp

@@ -4,6 +4,7 @@
 #include <unit.h>
 #include <QEvent>
 #include <QKeyEvent>
+#include <QDebug>
 
 SIUnitEdit::SIUnitEdit(QString unit, QString prefixes, int precision, QWidget *parent)
     : QLineEdit(parent)
@@ -28,9 +29,21 @@ SIUnitEdit::SIUnitEdit(QWidget *parent)
 
 void SIUnitEdit::setValue(double value)
 {
-    setValueQuiet(value);
-    emit valueChanged(value);
-    emit valueUpdated(this);
+    if(value != _value) {
+        setValueQuiet(value);
+        emit valueChanged(value);
+        emit valueUpdated(this);
+    }
+}
+
+static char swapUpperLower(char c) {
+    if(isupper(c)) {
+        return tolower(c);
+    } else if(islower(c)) {
+        return toupper(c);
+    } else {
+        return c;
+    }
 }
 
 bool SIUnitEdit::eventFilter(QObject *, QEvent *event)
@@ -47,16 +60,25 @@ bool SIUnitEdit::eventFilter(QObject *, QEvent *event)
         if(key == Qt::Key_Return) {
             // use new value without prefix
            parseNewValue(1.0);
+           continueEditing();
            return true;
         }
         auto mod = static_cast<QKeyEvent *>(event)->modifiers();
         if (!(mod & Qt::ShiftModifier)) {
             key = tolower(key);
         }
-        if(key <= 255 && prefixes.indexOf(key) >= 0) {
-            // a valid prefix key was pressed
-            parseNewValue(Unit::SIPrefixToFactor(key));
-            return true;
+        if(key <= 255) {
+            if (prefixes.indexOf(key) >= 0) {
+                // a valid prefix key was pressed
+                parseNewValue(Unit::SIPrefixToFactor(key));
+                continueEditing();
+                return true;
+            } else if (prefixes.indexOf(swapUpperLower(key)) >= 0) {
+                // no match on the pressed case but on the upper/lower case instead -> also accept this
+                parseNewValue(Unit::SIPrefixToFactor(swapUpperLower(key)));
+                continueEditing();
+                return true;
+            }
         }
     } else if(event->type() == QEvent::FocusOut) {
         if(!text().isEmpty()) {
@@ -78,7 +100,30 @@ void SIUnitEdit::setValueQuiet(double value)
 
 void SIUnitEdit::parseNewValue(double factor)
 {
-    double v = text().toDouble() * factor;
-    setValue(v);
-    clearFocus();
+    QString input = text();
+    // remove optional unit
+    if(input.endsWith(unit)) {
+        input.chop(unit.size());
+    }
+    auto lastChar = input.at(input.size()-1).toLatin1();
+    if(prefixes.indexOf(lastChar) >= 0) {
+        factor = Unit::SIPrefixToFactor(lastChar);
+        input.chop(1);
+    }
+    // remaining input should only contain numbers
+    bool conversion_ok;
+    auto v = input.toDouble(&conversion_ok);
+    if(conversion_ok) {
+        qDebug() << v;
+        setValue(v * factor);
+    } else {
+        qWarning() << "SIUnit conversion failure:" << input;
+    }
+    clear();
+}
+
+void SIUnitEdit::continueEditing()
+{
+    setText(placeholderText());
+    selectAll();
 }

Software/PC_Application/CustomWidgets/siunitedit.h

@@ -25,6 +25,7 @@ protected:
     bool eventFilter(QObject *obj, QEvent *event) override;
 private:
     void parseNewValue(double factor);
+    void continueEditing();
     QString unit, prefixes;
     int precision;
     double _value;

Software/PC_Application/SpectrumAnalyzer/spectrumanalyzer.cpp

@@ -294,12 +294,17 @@ void SpectrumAnalyzer::SetStopFreq(double freq)
 void SpectrumAnalyzer::SetCenterFreq(double freq)
 {
     auto old_span = settings.f_stop - settings.f_start;
-    if (freq > old_span / 2) {
-        settings.f_start = freq - old_span / 2;
-        settings.f_stop = freq + old_span / 2;
-    } else {
+    if (freq - old_span / 2 <= Device::Info().limits_minFreq) {
+        // would shift start frequency below minimum
         settings.f_start = 0;
         settings.f_stop = 2 * freq;
+    } else if(freq + old_span / 2 >= Device::Info().limits_maxFreq) {
+        // would shift stop frequency above maximum
+        settings.f_start = 2 * freq - Device::Info().limits_maxFreq;
+        settings.f_stop = Device::Info().limits_maxFreq;
+    } else {
+        settings.f_start = freq - old_span / 2;
+        settings.f_stop = freq + old_span / 2;
     }
     ConstrainAndUpdateFrequencies();
 }
@@ -307,12 +312,18 @@ void SpectrumAnalyzer::SetCenterFreq(double freq)
 void SpectrumAnalyzer::SetSpan(double span)
 {
     auto old_center = (settings.f_start + settings.f_stop) / 2;
-    if(old_center > span / 2) {
-        settings.f_start = old_center - span / 2;
+    if(old_center < Device::Info().limits_minFreq + span / 2) {
+        // would shift start frequency below minimum
+        settings.f_start = Device::Info().limits_minFreq;
+        settings.f_stop = Device::Info().limits_minFreq + span;
+    } else if(old_center > Device::Info().limits_maxFreq - span / 2) {
+        // would shift stop frequency above maximum
+        settings.f_start = Device::Info().limits_maxFreq - span;
+        settings.f_stop = Device::Info().limits_maxFreq;
     } else {
-        settings.f_start = 0;
+        settings.f_start = old_center - span / 2;
+         settings.f_stop = settings.f_start + span;
     }
-    settings.f_stop = old_center + span / 2;
     ConstrainAndUpdateFrequencies();
 }
 

Software/PC_Application/VNA/vna.cpp

@@ -226,6 +226,7 @@ VNA::VNA(AppWindow *window)
     dbm->setSingleStep(0.25);
     dbm->setSuffix("dbm");
     dbm->setToolTip("Stimulus level");
+    dbm->setKeyboardTracking(false);
     connect(dbm, qOverload<double>(&QDoubleSpinBox::valueChanged), this, &VNA::SetSourceLevel);
     connect(this, &VNA::sourceLevelChanged, dbm, &QDoubleSpinBox::setValue);
     tb_acq->addWidget(new QLabel("Level:"));
@@ -233,9 +234,10 @@ VNA::VNA(AppWindow *window)
 
     auto points = new QSpinBox();
     points->setFixedWidth(55);
-    points->setRange(1, 4501);
+    points->setRange(1, 9999);
     points->setSingleStep(100);
     points->setToolTip("Points/sweep");
+    points->setKeyboardTracking(false);
     connect(points, qOverload<int>(&QSpinBox::valueChanged), this, &VNA::SetPoints);
     connect(this, &VNA::pointsChanged, [=](int p) {
         points->blockSignals(true);
@@ -502,12 +504,17 @@ void VNA::SetStopFreq(double freq)
 void VNA::SetCenterFreq(double freq)
 {
     auto old_span = settings.f_stop - settings.f_start;
-    if (freq > old_span / 2) {
-        settings.f_start = freq - old_span / 2;
-        settings.f_stop = freq + old_span / 2;
-    } else {
+    if (freq - old_span / 2 <= Device::Info().limits_minFreq) {
+        // would shift start frequency below minimum
         settings.f_start = 0;
         settings.f_stop = 2 * freq;
+    } else if(freq + old_span / 2 >= Device::Info().limits_maxFreq) {
+        // would shift stop frequency above maximum
+        settings.f_start = 2 * freq - Device::Info().limits_maxFreq;
+        settings.f_stop = Device::Info().limits_maxFreq;
+    } else {
+        settings.f_start = freq - old_span / 2;
+        settings.f_stop = freq + old_span / 2;
     }
     ConstrainAndUpdateFrequencies();
 }
@@ -515,12 +522,18 @@ void VNA::SetCenterFreq(double freq)
 void VNA::SetSpan(double span)
 {
     auto old_center = (settings.f_start + settings.f_stop) / 2;
-    if(old_center > span / 2) {
-        settings.f_start = old_center - span / 2;
+    if(old_center < Device::Info().limits_minFreq + span / 2) {
+        // would shift start frequency below minimum
+        settings.f_start = Device::Info().limits_minFreq;
+        settings.f_stop = Device::Info().limits_minFreq + span;
+    } else if(old_center > Device::Info().limits_maxFreq - span / 2) {
+        // would shift stop frequency above maximum
+        settings.f_start = Device::Info().limits_maxFreq - span;
+        settings.f_stop = Device::Info().limits_maxFreq;
     } else {
-        settings.f_start = 0;
+        settings.f_start = old_center - span / 2;
+         settings.f_stop = settings.f_start + span;
     }
-    settings.f_stop = old_center + span / 2;
     ConstrainAndUpdateFrequencies();
 }