From b9b885c1481d9c6c4e0d0d84cce9aec98cf6a0d9 Mon Sep 17 00:00:00 2001
From: George Reales <contactus@discodsp.com>
Date: Mon, 28 Feb 2022 18:22:16 +0100
Subject: [PATCH] Oscillator octave lock using shift and mouse

---
 Source/Gui/Knob.h       | 15 +++++++++++++++
 Source/PluginEditor.cpp | 16 ++++++++++++++++
 2 files changed, 31 insertions(+)

diff --git a/Source/Gui/Knob.h b/Source/Gui/Knob.h
index 08e7df3..fbced57 100644
--- a/Source/Gui/Knob.h
+++ b/Source/Gui/Knob.h
@@ -94,6 +94,19 @@ public:
         }
         Slider::mouseDown(event);
     }
+
+    void mouseDrag(const MouseEvent& event) override
+	{
+        Slider::mouseDrag(event);
+        if (event.mods.isShiftDown())
+        {
+            if (shiftDragCallback)
+            {
+                setValue(shiftDragCallback(getValue()), sendNotificationAsync);
+            }
+        }
+	}
+
 // Source: https://git.iem.at/audioplugins/IEMPluginSuite/-/blob/master/resources/customComponents/ReverseSlider.h
 public:
     class KnobAttachment  : public juce::AudioProcessorValueTreeState::SliderAttachment
@@ -147,6 +160,8 @@ public:
         shouldResetOnShiftClick = value;
         resetActionMessage = identifier;
     }
+
+    std::function<double(double)> shiftDragCallback;
 private:
 	Image kni;
 	int fh, numFr;
diff --git a/Source/PluginEditor.cpp b/Source/PluginEditor.cpp
index 86b61da..95c5981 100755
--- a/Source/PluginEditor.cpp
+++ b/Source/PluginEditor.cpp
@@ -210,6 +210,14 @@ void ObxdAudioProcessorEditor::loadSkin (ObxdAudioProcessor& ownerFilter)
                     }
                     if (name == "osc1PitchKnob"){
                         osc1PitchKnob = addKnob (x, y, d, ownerFilter, OSC1P, "Osc1Pitch", 0);
+                        osc1PitchKnob->shiftDragCallback = [](double value)
+                        {
+                            if (value < 0.125) return 0.0;
+                            if (value < 0.375) return 0.25;
+                            if (value < 0.625) return 0.5;
+                            if (value < 0.875) return 0.75;
+                            return 1.0;
+                        };
                         mappingComps["osc1PitchKnob"] = osc1PitchKnob;
                     }
                     if (name == "pulseWidthKnob"){
@@ -218,6 +226,14 @@ void ObxdAudioProcessorEditor::loadSkin (ObxdAudioProcessor& ownerFilter)
                     }
                     if (name == "osc2PitchKnob"){
                         osc2PitchKnob = addKnob (x, y, d, ownerFilter, OSC2P, "Osc2Pitch", 0);
+                        osc2PitchKnob->shiftDragCallback = [](double value)
+                        {
+                            if (value < 0.125) return 0.0;
+                            if (value < 0.375) return 0.25;
+                            if (value < 0.625) return 0.5;
+                            if (value < 0.875) return 0.75;
+                            return 1.0;
+                        };
                         mappingComps["osc2PitchKnob"] = osc2PitchKnob;
                     }