[ui] Replace up/down buttons with a drag handle that allows user to s…

…ort aggregations. #5563

package.json

@@ -94,6 +94,7 @@
     "commander": "2.8.1",
     "css-loader": "0.17.0",
     "d3": "3.5.6",
+    "dragula": "3.6.8",
     "elasticsearch": "10.1.2",
     "elasticsearch-browser": "10.1.2",
     "expiry-js": "0.1.7",

src/plugins/kibana/public/settings/styles/main.less

@@ -201,3 +201,5 @@ kbn-settings-indices {
 .kbn-settings-indices-create {
   .time-and-pattern > div {}
 }
+
+@import "~ui/dragula/gu-dragula.less";

src/plugins/kibana/public/visualize/editor/agg.html

@@ -27,30 +27,16 @@
 
   <!-- controls !!!actually disabling buttons will break tooltips¡¡¡ -->
   <div class="vis-editor-agg-header-controls btn-group">
-    <!-- up button -->
+    <!-- drag handle -->
     <button
-      aria-label="Increase Priority"
+      draggable-handle
+      aria-label="Modify Priority by Dragging"
       ng-if="stats.count > 1"
-      ng-class="{ disabled: $first }"
-      ng-click="moveUp(agg)"
-      tooltip="Increase Priority"
+      tooltip="Modify Priority by Dragging"
       tooltip-append-to-body="true"
       type="button"
       class="btn btn-xs btn-primary">
-      <i aria-hidden="true" class="fa fa-caret-up"></i>
-    </button>
-
-    <!-- down button -->
-    <button
-      aria-label="Decrease Priority"
-      ng-if="stats.count > 1"
-      ng-class="{ disabled: $last }"
-      ng-click="moveDown(agg)"
-      tooltip="Decrease Priority"
-      tooltip-append-to-body="true"
-      type="button"
-      class="btn btn-xs btn-primary">
-      <i aria-hidden="true" class="fa fa-caret-down"></i>
+      <i aria-hidden="true" class="fa fa-arrows-v"></i>
     </button>
 
     <!-- remove button -->

src/plugins/kibana/public/visualize/editor/agg.js

@@ -47,13 +47,14 @@ uiModules
         return label ? label : '';
       };
 
-      function move(below, agg) {
-        _.move($scope.vis.aggs, agg, below, function (otherAgg) {
-          return otherAgg.schema.group === agg.schema.group;
-        });
-      }
-      $scope.moveUp = _.partial(move, false);
-      $scope.moveDown = _.partial(move, true);
+      $scope.$on('drag-start', e => {
+        $scope.editorWasOpen = $scope.editorOpen;
+        $scope.editorOpen = false;
+      });
+
+      $scope.$on('drag-end', e => {
+        $scope.editorOpen = $scope.editorWasOpen;
+      });
 
       $scope.remove = function (agg) {
         const aggs = $scope.vis.aggs;

src/plugins/kibana/public/visualize/editor/agg_group.html

@@ -3,9 +3,9 @@
     {{ groupName }}
   </div>
 
-  <div class="vis-editor-agg-group" ng-class="groupName">
+  <div ng-class="groupName" draggable-container="vis.aggs" class="vis-editor-agg-group">
     <!-- wrapper needed for nesting-indicator -->
-    <div ng-repeat="agg in group" class="vis-editor-agg-wrapper">
+    <div ng-repeat="agg in group" draggable-item="agg" class="vis-editor-agg-wrapper">
       <!-- agg.html - controls for aggregation -->
       <ng-form vis-editor-agg name="aggForm" class="vis-editor-agg"></ng-form>
     </div>

src/plugins/kibana/public/visualize/editor/draggable_container.js

@@ -0,0 +1,91 @@
+import _ from 'lodash';
+import $ from 'jquery';
+import dragula from 'dragula';
+import uiModules from 'ui/modules';
+
+uiModules
+.get('app/visualize')
+.directive('draggableContainer', function () {
+
+  return {
+    restrict: 'A',
+    scope: true,
+    controllerAs: 'draggableContainerCtrl',
+    controller($scope, $attrs, $parse) {
+      this.getList = () => $parse($attrs.draggableContainer)($scope);
+    },
+    link($scope, $el, attr) {
+      const drake = dragula({
+        containers: $el.toArray(),
+        moves(el, source, handle) {
+          const itemScope = $(el).scope();
+          if (!('draggableItemCtrl' in itemScope)) {
+            return; // only [draggable-item] is draggable
+          }
+          const $handle = $(handle);
+          const $anywhereInParentChain = $handle.parents().addBack();
+          const scope = $handle.scope();
+          const movable = scope.dragHandles.is($anywhereInParentChain);
+          return movable;
+        }
+      });
+
+      const drakeEvents = [
+        'cancel',
+        'cloned',
+        'drag',
+        'dragend',
+        'drop',
+        'out',
+        'over',
+        'remove',
+        'shadow'
+      ];
+      const prettifiedDrakeEvents = {
+        drag: 'start',
+        dragend: 'end'
+      };
+
+      drakeEvents.forEach(type => {
+        drake.on(type, (el, ...args) => forwardEvent(type, el, ...args));
+      });
+      drake.on('drag', markDragging(true));
+      drake.on('dragend', markDragging(false));
+      drake.on('drop', drop);
+      $scope.$on('$destroy', drake.destroy);
+
+      function markDragging(isDragging) {
+        return el => {
+          const scope = $(el).scope();
+          scope.isDragging = isDragging;
+          scope.$apply();
+        };
+      }
+
+      function forwardEvent(type, el, ...args) {
+        const name = `drag-${prettifiedDrakeEvents[type] || type}`;
+        const scope = $(el).scope();
+        scope.$broadcast(name, el, ...args);
+      }
+
+      function drop(el, target, source, sibling) {
+        const list = $scope.draggableContainerCtrl.getList();
+        const itemScope = $(el).scope();
+        const item = itemScope.draggableItemCtrl.getItem();
+        const toIndex = getSiblingItemIndex(list, sibling);
+        _.move(list, item, toIndex);
+      }
+
+      function getSiblingItemIndex(list, sibling) {
+        if (!sibling) { // means the item was dropped at the end of the list
+          return list.length - 1;
+        }
+        const siblingScope = $(sibling).scope();
+        const siblingItem = siblingScope.draggableItemCtrl.getItem();
+        const siblingIndex = list.indexOf(siblingItem);
+        return siblingIndex;
+      }
+    }
+  };
+
+});

src/plugins/kibana/public/visualize/editor/draggable_handle.js

@@ -0,0 +1,15 @@
+import uiModules from 'ui/modules';
+
+uiModules
+.get('app/visualize')
+.directive('draggableHandle', function () {
+  return {
+    restrict: 'A',
+    require: '^draggableItem',
+    link($scope, $el, attr, ctrl) {
+      ctrl.registerHandle($el);
+      $el.addClass('gu-handle');
+    }
+  };
+
+});

src/plugins/kibana/public/visualize/editor/draggable_item.js

@@ -0,0 +1,24 @@
+import $ from 'jquery';
+import uiModules from 'ui/modules';
+
+uiModules
+.get('app/visualize')
+.directive('draggableItem', function () {
+
+  return {
+    restrict: 'A',
+    require: '^draggableContainer',
+    scope: true,
+    controllerAs: 'draggableItemCtrl',
+    controller($scope, $attrs, $parse) {
+      this.getItem = () => $parse($attrs.draggableItem)($scope);
+      this.registerHandle = $el => {
+        $scope.dragHandles.push(...$el);
+      };
+    },
+    link($scope, $el, attr, ctrl) {
+      $scope.dragHandles = $();
+    }
+  };
+
+});

src/plugins/kibana/public/visualize/index.js

@@ -11,6 +11,9 @@ import 'plugins/kibana/visualize/editor/agg_params';
 import 'plugins/kibana/visualize/editor/nesting_indicator';
 import 'plugins/kibana/visualize/editor/sidebar';
 import 'plugins/kibana/visualize/editor/vis_options';
+import 'plugins/kibana/visualize/editor/draggable_container';
+import 'plugins/kibana/visualize/editor/draggable_item';
+import 'plugins/kibana/visualize/editor/draggable_handle';
 import 'plugins/kibana/visualize/saved_visualizations/_saved_vis';
 import 'plugins/kibana/visualize/saved_visualizations/saved_visualizations';
 import uiRoutes from 'ui/routes';

src/ui/public/dragula/gu-dragula.less

@@ -0,0 +1,13 @@
+.gu-handle {
+  cursor: move;
+  cursor: grab;
+  cursor: -moz-grab;
+  cursor: -webkit-grab;
+}
+
+.gu-mirror,
+.gu-mirror .gu-handle {
+  cursor: grabbing;
+  cursor: -moz-grabbing;
+  cursor: -webkit-grabbing;
+}

src/ui/public/styles/base.less

@@ -600,3 +600,5 @@ fieldset {
     }
   }
 }
+
+@import (reference) "~dragula/dist/dragula.css";