Added a method DragAndDropContainer::setCurrentDragImage

modules/juce_gui_basics/mouse/juce_DragAndDropContainer.cpp

@@ -43,7 +43,7 @@ public:
           imageOffset (offset),
           hasCheckedForExternalDrag (false)
     {
-        setSize (im.getWidth(), im.getHeight());
+        updateSize();
 
         if (mouseDragSource == nullptr)
             mouseDragSource = sourceComponent;
@@ -160,6 +160,13 @@ public:
         forceMouseCursorUpdate();
     }
 
+    void updateImage (const Image& newImage)
+    {
+        image = newImage;
+        updateSize();
+        repaint();
+    }
+
     void timerCallback() override
     {
         forceMouseCursorUpdate();
@@ -207,6 +214,11 @@ private:
     bool hasCheckedForExternalDrag;
     Time lastTimeOverTarget;
 
+    void updateSize()
+    {
+        setSize (image.getWidth(), image.getHeight());
+    }
+
     void forceMouseCursorUpdate()
     {
         Desktop::getInstance().getMainMouseSource().forceMouseCursorUpdate();
@@ -472,6 +484,12 @@ var DragAndDropContainer::getCurrentDragDescription() const
                                          : var();
 }
 
+void DragAndDropContainer::setCurrentDragImage (const Image& newImage)
+{
+    if (dragImageComponent != nullptr)
+        dragImageComponent->updateImage (newImage);
+}
+
 DragAndDropContainer* DragAndDropContainer::findParentDragContainerFor (Component* c)
 {
     return c != nullptr ? c->findParentComponentOfClass<DragAndDropContainer>() : nullptr;

modules/juce_gui_basics/mouse/juce_DragAndDropContainer.h

@@ -102,6 +102,9 @@ public:
     */
     var getCurrentDragDescription() const;
 
+    /** If a drag is in progress, this allows the image being shown to be dynamically updated. */
+    void setCurrentDragImage (const Image& newImage);
+
     /** Utility to find the DragAndDropContainer for a given Component.
 
         This will search up this component's parent hierarchy looking for the first