Visual Feedback when dragging over droppable targets

Closes surge-synthesizer#4995
baconpaul · Sep 6, 2021 · 23dc171 · 23dc171
1 parent c21bc67
commit 23dc171
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Showing 4 changed files with 68 additions and 1 deletion.
diff --git a/src/gui/SurgeGUIEditor.cpp b/src/gui/SurgeGUIEditor.cpp
@@ -3811,6 +3811,53 @@ void SurgeGUIEditor::promptForMiniEdit(const std::string &value, const std::stri
     miniEdit->grabFocus();
 }
 
+bool SurgeGUIEditor::modSourceButtonDraggedOver(Surge::Widgets::ModulationSourceButton *msb,
+                                                const juce::Point<int> &pt)
+{
+    juce::Component *target = nullptr;
+
+    auto isDroppable = [msb](juce::Component *c) {
+        auto tMCI = dynamic_cast<Surge::Widgets::ModulatableControlInterface *>(c);
+        if (tMCI)
+            return true;
+        return false;
+    };
+    auto recC = [isDroppable, msb, pt](juce::Component *p, auto rec) -> juce::Component * {
+        for (auto kid : p->getChildren())
+        {
+            if (kid && kid->isVisible() && kid != msb && kid->getBounds().contains(pt))
+            {
+                if (isDroppable(kid))
+                    return kid;
+
+                auto q = rec(kid, rec);
+                if (q)
+                    return q;
+            }
+        }
+        return nullptr;
+    };
+    target = recC(frame.get(), recC);
+    auto tMCI = dynamic_cast<Surge::Widgets::ModulatableSlider *>(target);
+    if (tMCI != modSourceDragOverTarget)
+    {
+        if (modSourceDragOverTarget)
+        {
+            modSourceDragOverTarget->setModulationState(priorModulationState);
+            modSourceDragOverTarget->asJuceComponent()->repaint();
+        }
+        modSourceDragOverTarget = tMCI;
+
+        if (tMCI)
+        {
+            priorModulationState = tMCI->modulationState;
+            tMCI->setModulationState(
+                Surge::Widgets::ModulatableControlInterface::MODULATED_BY_ACTIVE);
+            tMCI->asJuceComponent()->repaint();
+        }
+    }
+    return tMCI != nullptr;
+}
 void SurgeGUIEditor::modSourceButtonDroppedAt(Surge::Widgets::ModulationSourceButton *msb,
                                               const juce::Point<int> &pt)
 {
@@ -3855,6 +3902,13 @@ void SurgeGUIEditor::modSourceButtonDroppedAt(Surge::Widgets::ModulationSourceBu
     }
     else if (tMCI)
     {
+        if (modSourceDragOverTarget)
+        {
+            tMCI->setModulationState(priorModulationState);
+            tMCI->asJuceComponent()->repaint();
+
+            modSourceDragOverTarget = nullptr;
+        }
         openModTypeinOnDrop(msb->getCurrentModSource(), tMCI,
                             tMCI->asControlValueInterface()->getTag(), msb->getCurrentModIndex());
     }

diff --git a/src/gui/SurgeGUIEditor.h b/src/gui/SurgeGUIEditor.h
@@ -302,6 +302,10 @@ class SurgeGUIEditor : public Surge::GUI::IComponentTagValue::Listener,
     void mappingFileDropped(const std::string &fn);
     std::string tuningToHtml();
 
+    Surge::Widgets::ModulatableControlInterface *modSourceDragOverTarget{nullptr};
+    Surge::Widgets::ModulatableControlInterface::ModulationState priorModulationState;
+    bool modSourceButtonDraggedOver(Surge::Widgets::ModulationSourceButton *msb,
+                                    const juce::Point<int> &); // true if over a droppable target
     void modSourceButtonDroppedAt(Surge::Widgets::ModulationSourceButton *msb,
                                   const juce::Point<int> &);
     void swapControllers(int t1, int t2);

diff --git a/src/gui/widgets/ModulationSourceButton.cpp b/src/gui/widgets/ModulationSourceButton.cpp
@@ -62,7 +62,7 @@ void ModulationSourceButton::paint(juce::Graphics &g)
                                : skin->getColor(Colors::ModSource::Unused::TextHover);
     }
 
-    if (ActiveModSource)
+    if (ActiveModSource || transientArmed)
     {
         FrameCol = skin->getColor(Colors::ModSource::Armed::Border);
         if (isHovered)
@@ -427,6 +427,7 @@ void ModulationSourceButton::onSkinChanged()
 
 void ModulationSourceButton::mouseUp(const juce::MouseEvent &event)
 {
+    transientArmed = false;
     if (mouseMode == CLICK || mouseMode == CLICK_ARROW)
     {
         notifyValueChanged();
@@ -514,6 +515,13 @@ void ModulationSourceButton::mouseDrag(const juce::MouseEvent &event)
 
     mouseMode = DRAG_COMPONENT_HAPPEN;
     componentDragger.dragComponent(this, event, nullptr);
+    auto sge = firstListenerOfType<SurgeGUIEditor>();
+    auto q = event.position.translated(getBounds().getX(), getBounds().getY());
+    auto ota = transientArmed;
+    if (sge)
+        transientArmed = sge->modSourceButtonDraggedOver(this, q.toInt());
+    if (ota != transientArmed)
+        repaint();
     everDragged = true;
 }
 

diff --git a/src/gui/widgets/ModulationSourceButton.h b/src/gui/widgets/ModulationSourceButton.h
@@ -107,6 +107,7 @@ struct ModulationSourceButton : public juce::Component,
 
     void setState(int s) { state = s; }
     int getState() const { return state; }
+    bool transientArmed{false}; // armed in drop state
 
     bool secondaryHoverActive{false};