set delay using mouse wheel

Author: tadeubas

form.ui

@@ -447,9 +447,6 @@
        </property>
        <item>
         <widget class="QSlider" name="send_slider">
-         <property name="styleSheet">
-          <string notr="true"/>
-         </property>
          <property name="minimum">
           <number>10</number>
          </property>
@@ -589,7 +586,7 @@
           <number>2000</number>
          </property>
          <property name="singleStep">
-          <number>10</number>
+          <number>20</number>
          </property>
          <property name="value">
           <number>400</number>

seedqreader.py

@@ -719,6 +719,23 @@ def on_btn_save(self):
         self.config[self.radio_selected] = self.ui.data_out.toPlainText()
         self.dump_config()
 
+    def wheelEvent(self, event):
+
+        # If on Send / display QR tab
+        if self.ui.tabWidget.currentIndex() == 1:
+            numPixels = event.pixelDelta()
+            numDegrees = event.angleDelta() / 8
+            step = 0
+            if not numPixels.isNull():
+                step = numPixels.y()
+            elif not numDegrees.isNull():
+                numSteps = numDegrees / 15
+                step = numSteps.y()
+
+            self.ui.delay_slider.setValue(self.ui.delay_slider.value() + self.ui.delay_slider.singleStep() * step)
+
+        event.accept()
+
 
 if __name__ == '__main__':
     # the QUiLoader object needs to be initialized BEFORE the QApplication - https://stackoverflow.com/a/78041695