MDL-43145 dock: Enable regions before the drag operation starts

lib/yui/build/moodle-core-blocks/moodle-core-blocks-debug.js

@@ -443,7 +443,6 @@ MANAGER.prototype = {
             i = 0,
             region,
             regionname,
-            droptarget,
             dragdelegation;
 
         // Evil required by M.core.dragdrop.
@@ -472,7 +471,7 @@ MANAGER.prototype = {
             // Setting blockregion as droptarget (the case when it is empty)
             // The region-post (the right one)
             // is very narrow, so add extra padding on the left to drop block on it.
-            droptarget = new Y.DD.Drop({
+            new Y.DD.Drop({
                 node: region.get_droptarget(),
                 groups: this.groups,
                 padding: '40 240 40 240'
@@ -492,9 +491,10 @@ MANAGER.prototype = {
                 moveOnEnd: false
             });
             dragdelegation.dd.plug(Y.Plugin.DDWinScroll);
-            // On the mouse down event we will enable all block regions so that they can be dragged to.
+
-            // This is VERY important as without it dnd won't work for empty block regions.
+            // On the DD Manager start operation, we enable all block regions so that they can be drop targets. This
-            dragdelegation.on('drag:start', this.enable_all_regions, this);
+            // must be done *before* drag:start but after dragging has been initialised.
+            Y.DD.DDM.on('ddm:start', this.enable_all_regions, this);
 
             region.change_block_move_icons(this);
         }
@@ -536,11 +536,24 @@ MANAGER.prototype = {
 
     /**
      * Enables all fo the regions so that they are all visible while dragging is occuring.
+     *
      * @method enable_all_regions
      */
     enable_all_regions : function() {
-        var i = 0;
+        var groups = Y.DD.DDM.activeDrag.get('groups');
+
+        // As we're called by Y.DD.DDM, we can't be certain that the call
+        // relates specifically to a block drag/drop operation. Test
+        // whether the relevant group applies here.
+        if (!groups || Y.Array.indexOf(groups, 'block') === -1) {
+            return;
+        }
+
+        var i;
         for (i in this.regionobjects) {
+            if (!this.regionobjects.hasOwnProperty(i)) {
+                continue;
+            }
             this.regionobjects[i].enable();
         }
     },

lib/yui/build/moodle-core-blocks/moodle-core-blocks.js

@@ -439,7 +439,6 @@ MANAGER.prototype = {
             i = 0,
             region,
             regionname,
-            droptarget,
             dragdelegation;
 
         // Evil required by M.core.dragdrop.
@@ -468,7 +467,7 @@ MANAGER.prototype = {
             // Setting blockregion as droptarget (the case when it is empty)
             // The region-post (the right one)
             // is very narrow, so add extra padding on the left to drop block on it.
-            droptarget = new Y.DD.Drop({
+            new Y.DD.Drop({
                 node: region.get_droptarget(),
                 groups: this.groups,
                 padding: '40 240 40 240'
@@ -488,9 +487,10 @@ MANAGER.prototype = {
                 moveOnEnd: false
             });
             dragdelegation.dd.plug(Y.Plugin.DDWinScroll);
-            // On the mouse down event we will enable all block regions so that they can be dragged to.
+
-            // This is VERY important as without it dnd won't work for empty block regions.
+            // On the DD Manager start operation, we enable all block regions so that they can be drop targets. This
-            dragdelegation.on('drag:start', this.enable_all_regions, this);
+            // must be done *before* drag:start but after dragging has been initialised.
+            Y.DD.DDM.on('ddm:start', this.enable_all_regions, this);
 
             region.change_block_move_icons(this);
         }
@@ -531,11 +531,24 @@ MANAGER.prototype = {
 
     /**
      * Enables all fo the regions so that they are all visible while dragging is occuring.
+     *
      * @method enable_all_regions
      */
     enable_all_regions : function() {
-        var i = 0;
+        var groups = Y.DD.DDM.activeDrag.get('groups');
+
+        // As we're called by Y.DD.DDM, we can't be certain that the call
+        // relates specifically to a block drag/drop operation. Test
+        // whether the relevant group applies here.
+        if (!groups || Y.Array.indexOf(groups, 'block') === -1) {
+            return;
+        }
+
+        var i;
         for (i in this.regionobjects) {
+            if (!this.regionobjects.hasOwnProperty(i)) {
+                continue;
+            }
             this.regionobjects[i].enable();
         }
     },

lib/yui/src/blocks/js/manager.js

@@ -58,7 +58,6 @@ MANAGER.prototype = {
             i = 0,
             region,
             regionname,
-            droptarget,
             dragdelegation;
 
         // Evil required by M.core.dragdrop.
@@ -87,7 +86,7 @@ MANAGER.prototype = {
             // Setting blockregion as droptarget (the case when it is empty)
             // The region-post (the right one)
             // is very narrow, so add extra padding on the left to drop block on it.
-            droptarget = new Y.DD.Drop({
+            new Y.DD.Drop({
                 node: region.get_droptarget(),
                 groups: this.groups,
                 padding: '40 240 40 240'
@@ -107,9 +106,10 @@ MANAGER.prototype = {
                 moveOnEnd: false
             });
             dragdelegation.dd.plug(Y.Plugin.DDWinScroll);
-            // On the mouse down event we will enable all block regions so that they can be dragged to.
+
-            // This is VERY important as without it dnd won't work for empty block regions.
+            // On the DD Manager start operation, we enable all block regions so that they can be drop targets. This
-            dragdelegation.on('drag:start', this.enable_all_regions, this);
+            // must be done *before* drag:start but after dragging has been initialised.
+            Y.DD.DDM.on('ddm:start', this.enable_all_regions, this);
 
             region.change_block_move_icons(this);
         }
@@ -151,11 +151,24 @@ MANAGER.prototype = {
 
     /**
      * Enables all fo the regions so that they are all visible while dragging is occuring.
+     *
      * @method enable_all_regions
      */
     enable_all_regions : function() {
-        var i = 0;
+        var groups = Y.DD.DDM.activeDrag.get('groups');
+
+        // As we're called by Y.DD.DDM, we can't be certain that the call
+        // relates specifically to a block drag/drop operation. Test
+        // whether the relevant group applies here.
+        if (!groups || Y.Array.indexOf(groups, 'block') === -1) {
+            return;
+        }
+
+        var i;
         for (i in this.regionobjects) {
+            if (!this.regionobjects.hasOwnProperty(i)) {
+                continue;
+            }
             this.regionobjects[i].enable();
         }
     },