Implement ImageSlider::setStep

dgl/ImageSlider.hpp

@@ -48,8 +48,8 @@ public:
     void setEndPos(int x, int y);
 
     void setRange(float min, float max);
+    void setStep(float step);
     void setValue(float value, bool sendCallback = false);
-    void setIsSwitch(bool yesNo);
 
     void setCallback(Callback* callback);
 
@@ -62,9 +62,10 @@ private:
     Image fImage;
     float fMinimum;
     float fMaximum;
+    float fStep;
     float fValue;
+    float fValueTmp;
 
-    bool fIsSwitch;
     bool fDragging;
     int  fStartedX;
     int  fStartedY;

dgl/src/ImageKnob.cpp

@@ -303,7 +303,7 @@ bool ImageKnob::onMotion(int x, int y)
         if (int movX = x - fLastX)
         {
             d     = (getModifiers() & MODIFIER_SHIFT) ? 2000.0f : 200.0f;
-            value = fValue + (float(fMaximum - fMinimum) / d * float(movX));
+            value = fValueTmp + (float(fMaximum - fMinimum) / d * float(movX));
             doVal = true;
         }
     }

dgl/src/ImageSlider.cpp

@@ -16,6 +16,8 @@
 
 #include "../ImageSlider.hpp"
 
+#include <cmath>
+
 START_NAMESPACE_DGL
 
 // -----------------------------------------------------------------------
@@ -25,8 +27,9 @@ ImageSlider::ImageSlider(Window& parent, const Image& image)
       fImage(image),
       fMinimum(0.0f),
       fMaximum(1.0f),
+      fStep(0.0f),
       fValue(0.5f),
-      fIsSwitch(false),
+      fValueTmp(fValue),
       fDragging(false),
       fStartedX(0),
       fStartedY(0),
@@ -40,8 +43,9 @@ ImageSlider::ImageSlider(Widget* widget, const Image& image)
       fImage(image),
       fMinimum(0.0f),
       fMaximum(1.0f),
+      fStep(0.0f),
       fValue(0.5f),
-      fIsSwitch(false),
+      fValueTmp(fValue),
       fDragging(false),
       fStartedX(0),
       fStartedY(0),
@@ -55,8 +59,9 @@ ImageSlider::ImageSlider(const ImageSlider& imageSlider)
       fImage(imageSlider.fImage),
       fMinimum(imageSlider.fMinimum),
       fMaximum(imageSlider.fMaximum),
+      fStep(imageSlider.fStep),
       fValue(imageSlider.fValue),
-      fIsSwitch(imageSlider.fIsSwitch),
+      fValueTmp(fValue),
       fDragging(false),
       fStartedX(0),
       fStartedY(0),
@@ -118,27 +123,27 @@ void ImageSlider::setRange(float min, float max)
     fMaximum = max;
 }
 
+void ImageSlider::setStep(float step)
+{
+    fStep = step;
+}
+
 void ImageSlider::setValue(float value, bool sendCallback)
 {
     if (fValue == value)
         return;
 
     fValue = value;
+
+    if (fStep == 0.0f)
+        fValueTmp = value;
+
     repaint();
 
     if (sendCallback && fCallback != nullptr)
         fCallback->imageSliderValueChanged(this, fValue);
 }
 
-void ImageSlider::setIsSwitch(bool yesNo)
-{
-    if (fIsSwitch == yesNo)
-        return;
-
-    fIsSwitch = yesNo;
-    repaint();
-}
-
 void ImageSlider::setCallback(Callback* callback)
 {
     fCallback = callback;
@@ -198,21 +203,23 @@ bool ImageSlider::onMouse(int button, bool press, int x, int y)
 
         float value;
 
-        if (fIsSwitch)
+        value = fMaximum - vper * (fMaximum - fMinimum);
+
+        if (value < fMinimum)
         {
-            if (vper < 0.5f)
-                value = fMaximum;
-            else
-                value = fMinimum;
+            value = fMinimum;
+            fValueTmp = value;
         }
-        else
+        else if (value > fMaximum)
         {
-            value = fMaximum - vper * (fMaximum - fMinimum);
-
-            if (value < fMinimum)
-                value = fMinimum;
-            else if (value > fMaximum)
-                value = fMaximum;
+            value = fMaximum;
+            fValueTmp = value;
+        }
+        else if (fStep != 0.0f)
+        {
+            fValueTmp = value;
+            const float rest = std::fmod(value, fStep);
+            value = value - rest + (rest > fStep/2.0f ? fStep : 0.0f);
         }
 
         fDragging = true;
@@ -262,21 +269,23 @@ bool ImageSlider::onMotion(int x, int y)
 
         float value;
 
-        if (fIsSwitch)
+        value = fMaximum - vper * (fMaximum - fMinimum);
+
+        if (value < fMinimum)
         {
-            if (vper < 0.5f)
-                value = fMaximum;
-            else
-                value = fMinimum;
+            value = fMinimum;
+            fValueTmp = value;
         }
-        else
+        else if (value > fMaximum)
         {
-            value = fMaximum - vper * (fMaximum - fMinimum);
-
-            if (value < fMinimum)
-                value = fMinimum;
-            else if (value > fMaximum)
-                value = fMaximum;
+            value = fMaximum;
+            fValueTmp = value;
+        }
+        else if (fStep != 0.0f)
+        {
+            fValueTmp = value;
+            const float rest = std::fmod(value, fStep);
+            value = value - rest + (rest > fStep/2.0f ? fStep : 0.0f);
         }
 
         setValue(value, true);

examples/nekobi-ui_src/DistrhoUINekobi.cpp

@@ -41,7 +41,7 @@ DistrhoUINekobi::DistrhoUINekobi(DGL::Window& parent)
     fSliderWaveform->setEndPos(133, 60);
     fSliderWaveform->setRange(0.0f, 1.0f);
     fSliderWaveform->setValue(0.0f);
-    fSliderWaveform->setIsSwitch(true);
+    fSliderWaveform->setStep(1.0f);
 
     // knobs
     Image knobImage(DistrhoArtworkNekobi::knobData, DistrhoArtworkNekobi::knobWidth, DistrhoArtworkNekobi::knobHeight);