Added scroll controls

core/src/gui/main_window.cpp

@@ -648,6 +648,19 @@ void drawWindow() {
 
     ImGui::EndChild();
 
+    // Handle scrollwheel
+    int wheel = ImGui::GetIO().MouseWheel;
+    if (wheel != 0 && (gui::waterfall.mouseInFFT || gui::waterfall.mouseInWaterfall)) {
+        double nfreq = gui::waterfall.getCenterFrequency() + vfo->generalOffset + (vfo->snapInterval * wheel);
+        nfreq = roundl(nfreq / vfo->snapInterval) * vfo->snapInterval;
+        setVFO(nfreq);
+        core::configManager.aquire();
+        core::configManager.conf["frequency"] = gui::waterfall.getCenterFrequency();
+        if (vfo != NULL) {
+            core::configManager.conf["vfoOffsets"][gui::waterfall.selectedVFO] = vfo->generalOffset;
+        }
+        core::configManager.release(true);
+    }
     
     ImGui::NextColumn();
     ImGui::BeginChild("WaterfallControls");

core/src/gui/widgets/waterfall.cpp

@@ -256,9 +256,11 @@ namespace ImGui {
                                                 ImGuiButtonFlags_MouseButtonLeft | ImGuiButtonFlags_PressedOnClick);
 
         bool draging = ImGui::IsMouseDragging(ImGuiMouseButton_Left) && ImGui::IsWindowFocused();
-        bool mouseInFreq = IS_IN_AREA(dragOrigin, freqAreaMin, freqAreaMax);
-        bool mouseInFFT = IS_IN_AREA(dragOrigin, fftAreaMin, fftAreaMax);
-        bool mouseInWaterfall = IS_IN_AREA(dragOrigin, wfMin, wfMax);
+        mouseInFreq = IS_IN_AREA(dragOrigin, freqAreaMin, freqAreaMax);
+        mouseInFFT = IS_IN_AREA(dragOrigin, fftAreaMin, fftAreaMax);
+        mouseInWaterfall = IS_IN_AREA(dragOrigin, wfMin, wfMax);
+
+        int mouseWheel = ImGui::GetIO().MouseWheel;
 
         // Deselect everything if the mouse is released
         if (!ImGui::IsMouseDown(ImGuiMouseButton_Left)) {
@@ -361,6 +363,33 @@ namespace ImGui {
             return;
         }
 
+        // If the mouse wheel is moved on the frequency scale
+        if (mouseWheel != 0 && mouseInFreq) {
+            viewOffset -=  (double)mouseWheel * viewBandwidth / 20.0;
+
+            if (viewOffset + (viewBandwidth / 2.0) > wholeBandwidth / 2.0) {
+                double freqOffset = (viewOffset + (viewBandwidth / 2.0)) - (wholeBandwidth / 2.0);
+                viewOffset = (wholeBandwidth / 2.0) - (viewBandwidth / 2.0);
+                centerFreq += freqOffset;
+                centerFreqMoved = true;
+            }
+            if (viewOffset - (viewBandwidth / 2.0) < -(wholeBandwidth / 2.0)) {
+                double freqOffset = (viewOffset - (viewBandwidth / 2.0)) + (wholeBandwidth / 2.0);
+                viewOffset = (viewBandwidth / 2.0) - (wholeBandwidth / 2.0);
+                centerFreq += freqOffset;
+                centerFreqMoved = true;
+            }
+
+            lowerFreq = (centerFreq + viewOffset) - (viewBandwidth / 2.0);
+            upperFreq = (centerFreq + viewOffset) + (viewBandwidth / 2.0);
+
+            if (viewBandwidth != wholeBandwidth) {
+                updateAllVFOs();
+                if (_fullUpdate) { updateWaterfallFb(); };
+            }
+            return;
+        }
+
         // Finally, if nothing else was selected, just move the VFO
         if (ImGui::IsMouseDown(ImGuiMouseButton_Left) && (mouseInFFT|mouseInWaterfall)) {
             if (selVfo != NULL) {

core/src/gui/widgets/waterfall.h

@@ -129,6 +129,10 @@ namespace ImGui {
         bool bandplanEnabled = false;
         bandplan::BandPlan_t* bandplan = NULL;
 
+        bool mouseInFreq = false;
+        bool mouseInFFT = false;
+        bool mouseInWaterfall = false;
+
         std::map<std::string, WaterfallVFO*> vfos;
         std::string selectedVFO = "";
         bool selectedVFOChanged = false;