From 40793d2e7dddc415295e81f70486a47d24199302 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Jan=20K=C3=A4berich?= <kaeberic@ibr.cs.tu-bs.de>
Date: Mon, 30 Nov 2020 21:33:41 +0100
Subject: [PATCH] Selectable digit for scrollwheel increment

---
 .../CustomWidgets/siunitedit.cpp              | 32 +++++++++++++++----
 1 file changed, 25 insertions(+), 7 deletions(-)

diff --git a/Software/PC_Application/CustomWidgets/siunitedit.cpp b/Software/PC_Application/CustomWidgets/siunitedit.cpp
index 5e95822..96e649b 100644
--- a/Software/PC_Application/CustomWidgets/siunitedit.cpp
+++ b/Software/PC_Application/CustomWidgets/siunitedit.cpp
@@ -101,16 +101,34 @@ bool SIUnitEdit::eventFilter(QObject *, QEvent *event)
         int sign = increment > 0 ? 1 : -1;
         // figure out step increment
         auto newVal = _value;
-        while(steps > 0) {
-            // do update in multiple steps because the step size could change inbetween
+        auto cursor = cursorPosition();
+        if(cursor == 0) {
+            // no active cursor, use default digit
             constexpr int nthDigit = 3;
+            while(steps > 0) {
+                // do update in multiple steps because the step size could change inbetween
+                auto step_size = pow(10, floor(log10(std::abs(newVal))) - nthDigit + 1);
+                newVal += step_size * sign;
+                steps--;
+            }
+            setValue(newVal);
+        } else {
+            // change the digit at the current cursor
+            int nthDigit = cursor;
+            if(_value < 0) {
+                // account for sign
+                nthDigit--;
+            }
+            auto dotPos = text().indexOf('.');
+            if(dotPos >= 0 && dotPos < nthDigit) {
+                nthDigit--;
+            }
             auto step_size = pow(10, floor(log10(std::abs(newVal))) - nthDigit + 1);
-            newVal += step_size * sign;
-            steps--;
+            newVal += step_size * steps * sign;
+            setValue(newVal);
+            setText(placeholderText());
+            setCursorPosition(cursor);
         }
-        setValue(newVal);
-        continueEditing();
-        setFocus();
         return true;
     }
     return false;