Enhanced Drag and Drop support (macOS) (#1754)

* Enhanced Drag and Drop support

* Adding Drag'n'Drop TEXT support ... via new insertText() method

* Corrected some behaviors

* Correction to URL from native

* Fixes to Edit.js

* No focus - FILE drop - behavior

* Fix leak

* Tidy up WS

* Fix crash

* Adding drag&drop highlight to textbox

* Changes per PR comments

Author: FitzerIRL

examples/pxScene2d/src/Spark.cpp

@@ -356,6 +356,38 @@ class sceneWindow : public pxWindow, public pxIViewContainer
     EXITSCENELOCK()
   }
 
+  virtual void onDragMove(int32_t x, int32_t y, int32_t type)
+  {
+    ENTERSCENELOCK()
+    if (mView)
+    mView->onDragMove(x, y, type);
+    EXITSCENELOCK()
+  }
+
+  virtual void onDragEnter(int32_t x, int32_t y, int32_t type)
+  {
+    ENTERSCENELOCK()
+    if (mView)
+    mView->onDragEnter(x, y, type);
+    EXITSCENELOCK()
+  }
+
+  virtual void onDragLeave(int32_t x, int32_t y, int32_t type)
+  {
+    ENTERSCENELOCK()
+    if (mView)
+    mView->onDragLeave(x, y, type);
+    EXITSCENELOCK()
+  }
+
+  virtual void onDragDrop(int32_t x, int32_t y, int32_t type, const char* dropped)
+  {
+    ENTERSCENELOCK()
+    if (mView)
+    mView->onDragDrop(x, y, type, dropped);
+    EXITSCENELOCK()
+  }
+
   virtual void onScrollWheel(float dx, float dy)
   {
     ENTERSCENELOCK()

examples/pxScene2d/src/about.js

@@ -58,7 +58,8 @@ px.import({ scene: 'px:scene.1.js' }).then( function importsAreReady(imports)
                             font: fontRes, pixelSize: 12, wordWrap: true,
                             text: "Press SPACE to dismiss",
                             alignHorizontal: scene.alignHorizontal.CENTER,
-                            alignVertical:   scene.alignVertical.CENTER})
+                            alignVertical:   scene.alignVertical.CENTER});
+
   var dismissM = fontRes.measureText(12, dismissTXT.text);
   dismissTXT.h = dismissM.h;
   dismissTXT.w = dismissM.w;