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<pre class="prettyprint lang-js">// A DropZone which cooperates with DragZones whose dragData contains
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// a "field" property representing a form Field. Fields may be dropped onto
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// grid data cells containing a matching data type.
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Ext.define('Ext.ux.dd.CellFieldDropZone', {
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extend: 'Ext.dd.DropZone',
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constructor: function(cfg){
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cfg = cfg || {};
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if (cfg.onCellDrop) {
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this.onCellDrop = cfg.onCellDrop;
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}
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if (cfg.ddGroup) {
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this.ddGroup = cfg.ddGroup;
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}
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},
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// Call the DropZone constructor using the View's scrolling element
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// only after the grid has been rendered.
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init: function(grid) {
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var me = this;
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if (grid.rendered) {
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me.grid = grid;
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grid.getView().on({
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render: function(v) {
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me.view = v;
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Ext.ux.dd.CellFieldDropZone.superclass.constructor.call(me, me.view.el);
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},
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single: true
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});
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} else {
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grid.on('render', me.init, me, {single: true});
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}
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},
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// Scroll the main configured Element when we drag close to the edge
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containerScroll: true,
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getTargetFromEvent: function(e) {
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var me = this,
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v = me.view;
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// Ascertain whether the mousemove is within a grid cell
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var cell = e.getTarget(v.getCellSelector());
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if (cell) {
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// We *are* within a grid cell, so ask the View exactly which one,
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// Extract data from the Model to create a target object for
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// processing in subsequent onNodeXXXX methods. Note that the target does
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// not have to be a DOM element. It can be whatever the noNodeXXX methods are
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// programmed to expect.
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var row = v.findItemByChild(cell),
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columnIndex = cell.cellIndex;
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if (row && Ext.isDefined(columnIndex)) {
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return {
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node: cell,
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record: v.getRecord(row),
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fieldName: me.grid.columns[columnIndex].dataIndex
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};
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}
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}
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},
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// On Node enter, see if it is valid for us to drop the field on that type of column.
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onNodeEnter: function(target, dd, e, dragData) {
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delete this.dropOK;
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if (!target) {
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return;
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}
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// Check that a field is being dragged.
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var f = dragData.field;
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if (!f) {
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return;
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}
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// Check whether the data type of the column being dropped on accepts the
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// dragged field type. If so, set dropOK flag, and highlight the target node.
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var type = target.record.fields.get(target.fieldName).type,
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types = Ext.data.Types;
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switch(type){
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case types.FLOAT:
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case types.INT:
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if (!f.isXType('numberfield')) {
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return;
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}
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break;
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case types.DATE:
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if (!f.isXType('datefield')) {
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return;
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}
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break;
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case types.BOOL:
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if (!f.isXType('checkbox')) {
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return;
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}
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}
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this.dropOK = true;
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Ext.fly(target.node).addCls('x-drop-target-active');
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},
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// Return the class name to add to the drag proxy. This provides a visual indication
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// of drop allowed or not allowed.
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onNodeOver: function(target, dd, e, dragData) {
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return this.dropOK ? this.dropAllowed : this.dropNotAllowed;
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},
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// highlight the target node.
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onNodeOut: function(target, dd, e, dragData) {
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Ext.fly(target.node).removeCls('x-drop-target-active');
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},
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// Process the drop event if we have previously ascertained that a drop is OK.
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onNodeDrop: function(target, dd, e, dragData) {
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if (this.dropOK) {
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var value = dragData.field.getValue();
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target.record.set(target.fieldName, value);
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this.onCellDrop(target.fieldName, value);
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return true;
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}
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},
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onCellDrop: Ext.emptyFn
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});</pre>
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