PC Application: partial firmware update dialog

Software/PC_Application/CustomWidgets/siunitedit.cpp

@@ -0,0 +1,79 @@
+#include "siunitedit.h"
+
+#include <QDoubleValidator>
+#include <unit.h>
+#include <QEvent>
+#include <QKeyEvent>
+
+SIUnitEdit::SIUnitEdit(QString unit, QString prefixes, int precision, QWidget *parent)
+    : QLineEdit(parent)
+{
+    this->unit = unit;
+    this->prefixes = prefixes;
+    this->precision = precision;
+    setAlignment(Qt::AlignCenter);
+    installEventFilter(this);
+    setValidator(new QDoubleValidator);
+    connect(this, &QLineEdit::editingFinished, [this]() {
+       parseNewValue(1.0);
+    });
+}
+
+SIUnitEdit::SIUnitEdit(QWidget *parent)
+    : SIUnitEdit("", " ", 4, parent)
+{
+
+}
+
+void SIUnitEdit::setValue(double value)
+{
+    setValueQuiet(value);
+    emit valueChanged(value);
+}
+
+bool SIUnitEdit::eventFilter(QObject *, QEvent *event)
+{
+    if (event->type() == QEvent::KeyPress) {
+        int key = static_cast<QKeyEvent *>(event)->key();
+        if(key == Qt::Key_Escape) {
+            // abort editing process and set old value
+            setValueQuiet(_value);
+            return true;
+        }
+        if(key == Qt::Key_Return) {
+            // use new value without prefix
+           parseNewValue(1.0);
+           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;
+        }
+    } else if(event->type() == QEvent::FocusOut) {
+        if(!text().isEmpty()) {
+            parseNewValue(1.0);
+        } else {
+            setValueQuiet(_value);
+        }
+    }
+    return false;
+}
+
+void SIUnitEdit::setValueQuiet(double value)
+{
+    _value = value;
+    clear();
+    setPlaceholderText(Unit::ToString(value, unit, prefixes, precision));
+    clearFocus();
+}
+
+void SIUnitEdit::parseNewValue(double factor)
+{
+    double v = text().toDouble() * factor;
+    setValue(v);
+}