docs/source/DropZone2.html

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  18   <pre class="prettyprint lang-js"><span id='Ext-grid-header-DropZone'>/**
  19 </span> * @class Ext.grid.header.DropZone
  20  * @extends Ext.dd.DropZone
  21  * @private
  22  */
  23 Ext.define('Ext.grid.header.DropZone', {
  24     extend: 'Ext.dd.DropZone',
  25     colHeaderCls: Ext.baseCSSPrefix + 'column-header',
  26     proxyOffsets: [-4, -9],
  27
  28     constructor: function(headerCt){
  29         this.headerCt = headerCt;
  30         this.ddGroup = this.getDDGroup();
  31         this.callParent([headerCt.el]);
  32     },
  33
  34     getDDGroup: function() {
  35         return 'header-dd-zone-' + this.headerCt.up('[scrollerOwner]').id;
  36     },
  37
  38     getTargetFromEvent : function(e){
  39         return e.getTarget('.' + this.colHeaderCls);
  40     },
  41
  42     getTopIndicator: function() {
  43         if (!this.topIndicator) {
  44             this.topIndicator = Ext.DomHelper.append(Ext.getBody(), {
  45                 cls: &quot;col-move-top&quot;,
  46                 html: &quot;&amp;#160;&quot;
  47             }, true);
  48         }
  49         return this.topIndicator;
  50     },
  51
  52     getBottomIndicator: function() {
  53         if (!this.bottomIndicator) {
  54             this.bottomIndicator = Ext.DomHelper.append(Ext.getBody(), {
  55                 cls: &quot;col-move-bottom&quot;,
  56                 html: &quot;&amp;#160;&quot;
  57             }, true);
  58         }
  59         return this.bottomIndicator;
  60     },
  61
  62     getLocation: function(e, t) {
  63         var x      = e.getXY()[0],
  64             region = Ext.fly(t).getRegion(),
  65             pos, header;
  66
  67         if ((region.right - x) &lt;= (region.right - region.left) / 2) {
  68             pos = &quot;after&quot;;
  69         } else {
  70             pos = &quot;before&quot;;
  71         }
  72         return {
  73             pos: pos,
  74             header: Ext.getCmp(t.id),
  75             node: t
  76         };
  77     },
  78
  79     positionIndicator: function(draggedHeader, node, e){
  80         var location = this.getLocation(e, node),
  81             header = location.header,
  82             pos    = location.pos,
  83             nextHd = draggedHeader.nextSibling('gridcolumn:not([hidden])'),
  84             prevHd = draggedHeader.previousSibling('gridcolumn:not([hidden])'),
  85             region, topIndicator, bottomIndicator, topAnchor, bottomAnchor,
  86             topXY, bottomXY, headerCtEl, minX, maxX;
  87
  88         // Cannot drag beyond non-draggable start column
  89         if (!header.draggable &amp;&amp; header.getIndex() == 0) {
  90             return false;
  91         }
  92
  93         this.lastLocation = location;
  94
  95         if ((draggedHeader !== header) &amp;&amp;
  96             ((pos === &quot;before&quot; &amp;&amp; nextHd !== header) ||
  97             (pos === &quot;after&quot; &amp;&amp; prevHd !== header)) &amp;&amp;
  98             !header.isDescendantOf(draggedHeader)) {
  99
 100             // As we move in between different DropZones that are in the same
 101             // group (such as the case when in a locked grid), invalidateDrop
 102             // on the other dropZones.
 103             var allDropZones = Ext.dd.DragDropManager.getRelated(this),
 104                 ln = allDropZones.length,
 105                 i  = 0,
 106                 dropZone;
 107
 108             for (; i &lt; ln; i++) {
 109                 dropZone = allDropZones[i];
 110                 if (dropZone !== this &amp;&amp; dropZone.invalidateDrop) {
 111                     dropZone.invalidateDrop();
 112                 }
 113             }
 114
 115
 116             this.valid = true;
 117             topIndicator = this.getTopIndicator();
 118             bottomIndicator = this.getBottomIndicator();
 119             if (pos === 'before') {
 120                 topAnchor = 'tl';
 121                 bottomAnchor = 'bl';
 122             } else {
 123                 topAnchor = 'tr';
 124                 bottomAnchor = 'br';
 125             }
 126             topXY = header.el.getAnchorXY(topAnchor);
 127             bottomXY = header.el.getAnchorXY(bottomAnchor);
 128
 129             // constrain the indicators to the viewable section
 130             headerCtEl = this.headerCt.el;
 131             minX = headerCtEl.getLeft();
 132             maxX = headerCtEl.getRight();
 133
 134             topXY[0] = Ext.Number.constrain(topXY[0], minX, maxX);
 135             bottomXY[0] = Ext.Number.constrain(bottomXY[0], minX, maxX);
 136
 137             // adjust by offsets, this is to center the arrows so that they point
 138             // at the split point
 139             topXY[0] -= 4;
 140             topXY[1] -= 9;
 141             bottomXY[0] -= 4;
 142
 143             // position and show indicators
 144             topIndicator.setXY(topXY);
 145             bottomIndicator.setXY(bottomXY);
 146             topIndicator.show();
 147             bottomIndicator.show();
 148         // invalidate drop operation and hide indicators
 149         } else {
 150             this.invalidateDrop();
 151         }
 152     },
 153
 154     invalidateDrop: function() {
 155         this.valid = false;
 156         this.hideIndicators();
 157     },
 158
 159     onNodeOver: function(node, dragZone, e, data) {
 160         if (data.header.el.dom !== node) {
 161             this.positionIndicator(data.header, node, e);
 162         }
 163         return this.valid ? this.dropAllowed : this.dropNotAllowed;
 164     },
 165
 166     hideIndicators: function() {
 167         this.getTopIndicator().hide();
 168         this.getBottomIndicator().hide();
 169     },
 170
 171     onNodeOut: function() {
 172         this.hideIndicators();
 173     },
 174
 175     onNodeDrop: function(node, dragZone, e, data) {
 176         if (this.valid) {
 177             this.invalidateDrop();
 178             var hd = data.header,
 179                 lastLocation = this.lastLocation,
 180                 fromCt  = hd.ownerCt,
 181                 fromIdx = fromCt.items.indexOf(hd), // Container.items is a MixedCollection
 182                 toCt    = lastLocation.header.ownerCt,
 183                 toIdx   = toCt.items.indexOf(lastLocation.header),
 184                 headerCt = this.headerCt,
 185                 groupCt,
 186                 scrollerOwner;
 187
 188             if (lastLocation.pos === 'after') {
 189                 toIdx++;
 190             }
 191
 192             // If we are dragging in between two HeaderContainers that have had the lockable
 193             // mixin injected we will lock/unlock headers in between sections. Note that lockable
 194             // does NOT currently support grouped headers.
 195             if (fromCt !== toCt &amp;&amp; fromCt.lockableInjected &amp;&amp; toCt.lockableInjected &amp;&amp; toCt.lockedCt) {
 196                 scrollerOwner = fromCt.up('[scrollerOwner]');
 197                 scrollerOwner.lock(hd, toIdx);
 198             } else if (fromCt !== toCt &amp;&amp; fromCt.lockableInjected &amp;&amp; toCt.lockableInjected &amp;&amp; fromCt.lockedCt) {
 199                 scrollerOwner = fromCt.up('[scrollerOwner]');
 200                 scrollerOwner.unlock(hd, toIdx);
 201             } else {
 202                 // If dragging rightwards, then after removal, the insertion index will be one less when moving
 203                 // in between the same container.
 204                 if ((fromCt === toCt) &amp;&amp; (toIdx &gt; fromCt.items.indexOf(hd))) {
 205                     toIdx--;
 206                 }
 207
 208                 // Remove dragged header from where it was without destroying it or relaying its Container
 209                 if (fromCt !== toCt) {
 210                     fromCt.suspendLayout = true;
 211                     fromCt.remove(hd, false);
 212                     fromCt.suspendLayout = false;
 213                 }
 214
 215                 // Dragged the last header out of the fromCt group... The fromCt group must die
 216                 if (fromCt.isGroupHeader) {
 217                     if (!fromCt.items.getCount()) {
 218                         groupCt = fromCt.ownerCt;
 219                         groupCt.suspendLayout = true;
 220                         groupCt.remove(fromCt, false);
 221                         fromCt.el.dom.parentNode.removeChild(fromCt.el.dom);
 222                         groupCt.suspendLayout = false;
 223                     } else {
 224                         fromCt.minWidth = fromCt.getWidth() - hd.getWidth();
 225                         fromCt.setWidth(fromCt.minWidth);
 226                     }
 227                 }
 228
 229                 // Move dragged header into its drop position
 230                 toCt.suspendLayout = true;
 231                 if (fromCt === toCt) {
 232                     toCt.move(fromIdx, toIdx);
 233                 } else {
 234                     toCt.insert(toIdx, hd);
 235                 }
 236                 toCt.suspendLayout = false;
 237
 238                 // Group headers acquire the aggregate width of their child headers
 239                 // Therefore a child header may not flex; it must contribute a fixed width.
 240                 // But we restore the flex value when moving back into the main header container
 241                 if (toCt.isGroupHeader) {
 242                     hd.savedFlex = hd.flex;
 243                     delete hd.flex;
 244                     hd.width = hd.getWidth();
 245                     // When there was previously a flex, we need to ensure we don't count for the
 246                     // border twice.
 247                     toCt.minWidth = toCt.getWidth() + hd.getWidth() - (hd.savedFlex ? 1 : 0);
 248                     toCt.setWidth(toCt.minWidth);
 249                 } else {
 250                     if (hd.savedFlex) {
 251                         hd.flex = hd.savedFlex;
 252                         delete hd.width;
 253                     }
 254                 }
 255
 256
 257                 // Refresh columns cache in case we remove an emptied group column
 258                 headerCt.purgeCache();
 259                 headerCt.doLayout();
 260                 headerCt.onHeaderMoved(hd, fromIdx, toIdx);
 261                 // Emptied group header can only be destroyed after the header and grid have been refreshed
 262                 if (!fromCt.items.getCount()) {
 263                     fromCt.destroy();
 264                 }
 265             }
 266         }
 267     }
 268 });
 269 </pre>
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