This class provides a container DD instance that allows dropping on multiple child target nodes.
*By default, this class requires that child nodes accepting drop are registered with {@link Ext.dd.Registry}. * However a simpler way to allow a DropZone to manage any number of target elements is to configure the * DropZone with an implementation of {@link #getTargetFromEvent} which interrogates the passed * mouse event to see if it has taken place within an element, or class of elements. This is easily done * by using the event's {@link Ext.EventObject#getTarget getTarget} method to identify a node based on a * {@link Ext.DomQuery} selector.
*Once the DropZone has detected through calling getTargetFromEvent, that the mouse is over * a drop target, that target is passed as the first parameter to {@link #onNodeEnter}, {@link #onNodeOver}, * {@link #onNodeOut}, {@link #onNodeDrop}. You may configure the instance of DropZone with implementations * of these methods to provide application-specific behaviour for these events to update both * application state, and UI state.
*For example to make a GridPanel a cooperating target with the example illustrated in * {@link Ext.dd.DragZone DragZone}, the following technique might be used:
myGridPanel.on('render', function() {
myGridPanel.dropZone = new Ext.dd.DropZone(myGridPanel.getView().scroller, {
// If the mouse is over a grid row, return that node. This is
// provided as the "target" parameter in all "onNodeXXXX" node event handling functions
getTargetFromEvent: function(e) {
return e.getTarget(myGridPanel.getView().rowSelector);
},
// On entry into a target node, highlight that node.
onNodeEnter : function(target, dd, e, data){
Ext.fly(target).addClass('my-row-highlight-class');
},
// On exit from a target node, unhighlight that node.
onNodeOut : function(target, dd, e, data){
Ext.fly(target).removeClass('my-row-highlight-class');
},
// While over a target node, return the default drop allowed class which
// places a "tick" icon into the drag proxy.
onNodeOver : function(target, dd, e, data){
return Ext.dd.DropZone.prototype.dropAllowed;
},
// On node drop we can interrogate the target to find the underlying
// application object that is the real target of the dragged data.
// In this case, it is a Record in the GridPanel's Store.
// We can use the data set up by the DragZone's getDragData method to read
// any data we decided to attach in the DragZone's getDragData method.
onNodeDrop : function(target, dd, e, data){
var rowIndex = myGridPanel.getView().findRowIndex(target);
var r = myGridPanel.getStore().getAt(rowIndex);
Ext.Msg.alert('Drop gesture', 'Dropped Record id ' + data.draggedRecord.id +
' on Record id ' + r.id);
return true;
}
});
}